Keep the CSP nonce cookie off public cacheable responses

The nonce generator runs for every response that carries the policy, so the nonce_id cookie was set on QR codes, logos, avatars and disk-served blobs — all public, shared-cacheable. Those endpoints now opt out of the policy, so no cache can replay one client's identifier and nonce.
Tokenize CSP_EXTRA_* semicolons to avoid a per-request 500
2026-10-28 00:16:48 +09:00 · 2026-09-13 17:01:24 -07:00 · 2026-08-08 19:37:53 -07:00 · 2026-08-08 18:33:58 -07:00 · 2026-08-08 17:30:58 -07:00 · 2026-08-08 14:27:51 -07:00
239 changed files with 1256 additions and 8054 deletions
@@ -50,6 +50,3 @@

 # Ignore test files
 /test/
-
-# Agent session state — worktrees under .claude/ are whole extra checkouts of this repo
-.claude
@@ -20,12 +20,13 @@ updates:
      semver-minor-days: 3
      semver-patch-days: 2
      default-days: 7
-      exclude:
-        - "brakeman"

-  # No docker ecosystem. Our base image tag is a build arg
-  # (`FROM ruby:$RUBY_VERSION-slim`), which the updater cannot read, so the
-  # entry only ever matched nothing — worse than no entry, because it looked
-  # like coverage. Ruby base image bumps are a manual, reviewed step here, as
-  # they are across the rest of the fleet. Keep Dockerfile, Dockerfile-export
-  # and .ruby-version on the same version by hand.
+  - package-ecosystem: docker
+    directory: "/"
+    schedule:
+      interval: weekly
+    cooldown:
+      semver-major-days: 7
+      semver-minor-days: 3
+      semver-patch-days: 2
+      default-days: 7
@@ -16,12 +16,12 @@ jobs:

    steps:
      - name: Checkout code
-        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+        uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4.3.1
        with:
          persist-credentials: false

      - name: Set up Ruby
-        uses: ruby/setup-ruby@14594264cd68ce8a2345dd349bc3d138a4ef85c8 # v1.327.0
+        uses: ruby/setup-ruby@319994f95fa847cf3fb3cd3dbe89f6dcde9f178f # v1.295.0
        with:
          ruby-version: .ruby-version
          bundler-cache: true
@@ -35,12 +35,12 @@ jobs:
      contents: read
    steps:
      - name: Checkout code
-        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+        uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4.3.1
        with:
          persist-credentials: false

      - name: Set up Ruby
-        uses: ruby/setup-ruby@14594264cd68ce8a2345dd349bc3d138a4ef85c8 # v1.327.0
+        uses: ruby/setup-ruby@319994f95fa847cf3fb3cd3dbe89f6dcde9f178f # v1.295.0
        with:
          ruby-version: .ruby-version
          bundler-cache: true
@@ -48,29 +48,6 @@ jobs:
      - name: Lint code for consistent style
        run: bin/rubocop

-  herb:
-    name: Herb check
-    runs-on: ubuntu-latest
-    permissions:
-      contents: read
-    steps:
-      - name: Install packages
-        run: sudo apt-get update && sudo apt-get install --no-install-recommends -y libvips
-
-      - name: Checkout code
-        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
-        with:
-          persist-credentials: false
-
-      - name: Set up Ruby
-        uses: ruby/setup-ruby@a0102e0972be65f351c307e2d64b9314a57c8073 # v1.324.0
-        with:
-          ruby-version: .ruby-version
-          bundler-cache: true
-
-      - name: Check that every HTML template compiles through Herb
-        run: bin/rails herb:check
-
  lint-actions:
    name: GitHub Actions audit
    runs-on: ubuntu-latest
@@ -78,15 +55,15 @@ jobs:
      contents: read

    steps:
-      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4.3.1
        with:
          persist-credentials: false

      - name: Run actionlint
-        uses: rhysd/actionlint@914e7df21a07ef503a81201c76d2b11c789d3fca # v1.7.12
+        uses: rhysd/actionlint@393031adb9afb225ee52ae2ccd7a5af5525e03e8 # v1.7.11

      - name: Run zizmor
-        uses: zizmorcore/zizmor-action@cc914d7f3750a2d13d75c7f184a1060aa0e9d482 # v0.6.4
+        uses: zizmorcore/zizmor-action@71321a20a9ded102f6e9ce5718a2fcec2c4f70d8 # v0.5.2
        with:
          advanced-security: false

@@ -102,15 +79,15 @@ jobs:
        options: --health-cmd "redis-cli ping" --health-interval 10s --health-timeout 5s --health-retries 5
    steps:
      - name: Install packages
-        run: sudo apt-get update && sudo apt-get install --no-install-recommends -y libsqlite3-0 sqlite3 libvips curl ffmpeg
+        run: sudo apt-get update && sudo apt-get install --no-install-recommends -y libsqlite3-0 libvips curl ffmpeg

      - name: Checkout code
-        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+        uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4.3.1
        with:
          persist-credentials: false

      - name: Set up Ruby
-        uses: ruby/setup-ruby@14594264cd68ce8a2345dd349bc3d138a4ef85c8 # v1.327.0
+        uses: ruby/setup-ruby@319994f95fa847cf3fb3cd3dbe89f6dcde9f178f # v1.295.0
        env:
          REDIS_URL: redis://localhost:6379/0
        with:
@@ -120,9 +97,6 @@ jobs:
      - name: Run tests
        run: bin/rails db:setup test

-      - name: Test benchmark response validation
-        run: bundle exec ruby bench/test_http_client.rb
-
  test_system:
    runs-on: ubuntu-latest
    permissions:
@@ -135,15 +109,15 @@ jobs:
        options: --health-cmd "redis-cli ping" --health-interval 10s --health-timeout 5s --health-retries 5
    steps:
      - name: Install packages
-        run: sudo apt-get update && sudo apt-get install --no-install-recommends -y libsqlite3-0 sqlite3 libvips curl ffmpeg
+        run: sudo apt-get update && sudo apt-get install --no-install-recommends -y libsqlite3-0 libvips curl ffmpeg

      - name: Checkout code
-        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+        uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4.3.1
        with:
          persist-credentials: false

      - name: Set up Ruby
-        uses: ruby/setup-ruby@14594264cd68ce8a2345dd349bc3d138a4ef85c8 # v1.327.0
+        uses: ruby/setup-ruby@319994f95fa847cf3fb3cd3dbe89f6dcde9f178f # v1.295.0
        env:
          REDIS_URL: redis://localhost:6379/0
        with:
@@ -44,15 +44,15 @@ jobs:
      IMAGE_NAME: ${{ github.repository }}
    steps:
      - name: Checkout
-        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+        uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
        with:
          persist-credentials: false

      - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@f87e5991a6d7451dcb8d9637bfbc97413f497069 # v4.4.1
+        uses: docker/setup-buildx-action@e468171a9de216ec08956ac3ada2f0791b6bd435 # v3.11.1

      - name: Log in to GHCR
-        uses: docker/login-action@dbcb813823bdd20940b903addbd779551569679f # v4.6.0
+        uses: docker/login-action@184bdaa0721073962dff0199f1fb9940f07167d1 # v3.5.0
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.actor }}
@@ -80,7 +80,7 @@ jobs:

      - name: Extract Docker metadata (tags, labels) with arch suffix
        id: meta
-        uses: docker/metadata-action@dc802804100637a589fabce1cb79ff13a1411302 # v6.2.0
+        uses: docker/metadata-action@c1e51972afc2121e065aed6d45c65596fe445f3f # v5.8.0
        with:
          images: ${{ steps.vars.outputs.canonical }}
          tags: |
@@ -98,7 +98,7 @@ jobs:

      - name: Build and push (${{ matrix.platform }})
        id: build
-        uses: docker/build-push-action@c3c9e263c25d99ce0380d002d59b67737d91b0dc # v7.4.0
+        uses: docker/build-push-action@263435318d21b8e681c14492fe198d362a7d2c83 # v6.18.0
        with:
          context: .
          file: Dockerfile
@@ -118,7 +118,7 @@ jobs:

      - name: Attest image provenance (per-arch)
        if: github.event_name != 'pull_request'
-        uses: actions/attest-build-provenance@4d101475d8b20a2381f78447822ac1eab6504dd8 # v4.2.2
+        uses: actions/attest-build-provenance@977bb373ede98d70efdf65b84cb5f73e068dcc2a # v3.0.0
        with:
          subject-name: ${{ steps.vars.outputs.canonical }}
          subject-digest: ${{ steps.build.outputs.digest }}
@@ -139,10 +139,10 @@ jobs:
      IMAGE_NAME: ${{ github.repository }}
    steps:
      - name: Set up Docker Buildx (for imagetools)
-        uses: docker/setup-buildx-action@f87e5991a6d7451dcb8d9637bfbc97413f497069 # v4.4.1
+        uses: docker/setup-buildx-action@e468171a9de216ec08956ac3ada2f0791b6bd435 # v3.11.1

      - name: Log in to GHCR
-        uses: docker/login-action@dbcb813823bdd20940b903addbd779551569679f # v4.6.0
+        uses: docker/login-action@184bdaa0721073962dff0199f1fb9940f07167d1 # v3.5.0
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.actor }}
@@ -159,7 +159,7 @@ jobs:

      - name: Compute base tags (no suffix)
        id: meta
-        uses: docker/metadata-action@dc802804100637a589fabce1cb79ff13a1411302 # v6.2.0
+        uses: docker/metadata-action@c1e51972afc2121e065aed6d45c65596fe445f3f # v5.8.0
        with:
          images: ${{ steps.vars.outputs.canonical }}
          tags: |
@@ -207,7 +207,7 @@ jobs:
          done <<< "$tags"

      - name: Install Cosign
-        uses: sigstore/cosign-installer@6f9f17788090df1f26f669e9d70d6ae9567deba6 # v4.1.2
+        uses: sigstore/cosign-installer@d58896d6a1865668819e1d91763c7751a165e159 # v3.9.2

      - name: Cosign sign all tags (keyless OIDC)
        shell: bash
@@ -1 +1 @@
-4.0.7
+3.4.5
@@ -1,7 +1,7 @@
 # syntax = docker/dockerfile:1

 # Make sure it matches the Ruby version in .ruby-version and Gemfile
-ARG RUBY_VERSION=4.0.7
+ARG RUBY_VERSION=3.4.5
 FROM docker.io/library/ruby:$RUBY_VERSION-slim AS base

 # Rails app lives here
@@ -1,7 +1,7 @@
 # syntax = docker/dockerfile:1

 # Make sure it matches the Ruby version in .ruby-version and Gemfile
-ARG RUBY_VERSION=4.0.7
+ARG RUBY_VERSION=3.4.7
 FROM ruby:$RUBY_VERSION-slim as base

 # Install the tools we need
@@ -12,7 +12,7 @@ gem "sqlite3"
 gem "redis", "~> 5.4"

 # Deployment
-gem "puma", "~> 8.0"
+gem "puma", "~> 7.2", ">= 7.2.1"

 # Jobs
 gem "resque", "~> 2.7.0"
@@ -26,9 +26,6 @@ gem "importmap-rails", github: "rails/importmap-rails"
 gem "turbo-rails", github: "hotwired/turbo-rails"
 gem "stimulus-rails"

-# Rich text
-gem "lexxy", "~> 0.9.24"
-
 # Media handling
 gem "image_processing", ">= 1.2"

@@ -43,7 +40,7 @@ gem "rqrcode"
 gem "rails_autolink"
 gem "geared_pagination"
 gem "jbuilder"
-gem "surfguard", github: "basecamp/surfguard" # The SSRF address policy behind RestrictedHTTP
+gem "net-http-persistent"
 gem "kredis"
 gem "platform_agent"
 gem "thruster"
@@ -1,9 +1,3 @@
-GIT
-  remote: https://github.com/basecamp/surfguard.git
-  revision: 59e278c01a537755f22791429051891949231ead
-  specs:
-    surfguard (0.2.0)
-
 GIT
  remote: https://github.com/hotwired/turbo-rails.git
  revision: 30cd8fcc6f82c1ad4edd1ed6069ba878f21f02b3
@@ -23,16 +17,16 @@ GIT

 GIT
  remote: https://github.com/rails/propshaft.git
-  revision: dc979db89cd07c72ee4d11d415ae1cb4fd072623
+  revision: e49a9de659ff27462015e54dd832e86e762a6ddc
  specs:
-    propshaft (1.3.2)
+    propshaft (1.2.1)
      actionpack (>= 7.0.0)
      activesupport (>= 7.0.0)
      rack

 GIT
  remote: https://github.com/rails/rails.git
-  revision: e3d5c569d217c56c022b04acb127a8c24dbe9685
+  revision: 1a02651ac37fb64b4de2a2b73461d86acf9c98fb
  branch: main
  specs:
    actioncable (8.2.0.alpha)
@@ -63,10 +57,10 @@ GIT
      rack-session (>= 1.0.1)
      rack-test (>= 0.6.3)
      rails-dom-testing (~> 2.2)
-      rails-html-sanitizer (~> 1.7)
+      rails-html-sanitizer (~> 1.6)
      useragent (~> 0.16)
    actiontext (8.2.0.alpha)
-      action_text-trix (~> 2.1.16)
+      action_text-trix (~> 2.1.15)
      actionpack (= 8.2.0.alpha)
      activerecord (= 8.2.0.alpha)
      activestorage (= 8.2.0.alpha)
@@ -77,12 +71,11 @@ GIT
      activesupport (= 8.2.0.alpha)
      builder (~> 3.1)
      erubi (~> 1.11)
-      herb (>= 0.10)
      rails-dom-testing (~> 2.2)
-      rails-html-sanitizer (~> 1.7)
+      rails-html-sanitizer (~> 1.6)
    activejob (8.2.0.alpha)
      activesupport (= 8.2.0.alpha)
-      globalid (>= 1.4.0)
+      globalid (>= 0.3.6)
    activemodel (8.2.0.alpha)
      activesupport (= 8.2.0.alpha)
    activerecord (8.2.0.alpha)
@@ -94,7 +87,7 @@ GIT
      activejob (= 8.2.0.alpha)
      activerecord (= 8.2.0.alpha)
      activesupport (= 8.2.0.alpha)
-      marcel (~> 2.0)
+      marcel (~> 1.0)
    activesupport (8.2.0.alpha)
      base64
      bigdecimal
@@ -105,8 +98,6 @@ GIT
      json
      logger (>= 1.4.2)
      minitest (>= 5.1)
-      psych (>= 4)
-      ractor-dispatch (>= 0.3.0)
      securerandom (>= 0.3)
      tzinfo (~> 2.0, >= 2.0.5)
      uri (>= 0.13.1)
@@ -145,8 +136,8 @@ GEM
    base64 (0.3.0)
    bcrypt (3.1.22)
    benchmark (0.5.0)
-    bigdecimal (4.1.3)
-    brakeman (8.0.6)
+    bigdecimal (3.3.1)
+    brakeman (8.0.5)
      racc
    builder (3.3.0)
    bundler-audit (0.9.3)
@@ -162,7 +153,7 @@ GEM
      regexp_parser (>= 1.5, < 3.0)
      xpath (~> 3.2)
    chunky_png (1.4.0)
-    concurrent-ruby (1.3.8)
+    concurrent-ruby (1.3.7)
    connection_pool (2.5.5)
    crack (1.0.0)
      bigdecimal
@@ -173,11 +164,10 @@ GEM
      irb (~> 1.10)
      reline (>= 0.3.8)
    drb (2.2.3)
-    erb (6.0.7)
+    erb (6.0.4)
    erubi (1.13.1)
-    faker (3.8.0)
+    faker (3.5.2)
      i18n (>= 1.8.11, < 2)
-    ffi (1.17.2)
    ffi (1.17.2-aarch64-linux-gnu)
    ffi (1.17.2-arm64-darwin)
    ffi (1.17.2-x86_64-darwin)
@@ -185,28 +175,23 @@ GEM
    geared_pagination (1.2.0)
      activesupport (>= 5.0)
      addressable (>= 2.5.0)
-    globalid (1.4.0)
+    globalid (1.3.0)
      activesupport (>= 6.1)
    hashdiff (1.2.0)
-    herb (0.11.0-aarch64-linux-gnu)
-    herb (0.11.0-arm64-darwin)
-    herb (0.11.0-x86_64-darwin)
-    herb (0.11.0-x86_64-linux-gnu)
-    i18n (1.15.2)
+    i18n (1.14.7)
      concurrent-ruby (~> 1.0)
    image_processing (1.14.0)
      mini_magick (>= 4.9.5, < 6)
      ruby-vips (>= 2.0.17, < 3)
-    io-console (0.9.4)
-    irb (1.18.0)
+    io-console (0.8.1)
+    irb (1.15.3)
      pp (>= 0.6.0)
-      prism (>= 1.3.0)
      rdoc (>= 4.0.0)
      reline (>= 0.4.2)
    jbuilder (2.14.1)
      actionview (>= 7.0.0)
      activesupport (>= 7.0.0)
-    json (2.21.2)
+    json (2.20.0)
    jwt (3.2.0)
      base64
    kredis (1.8.0)
@@ -214,41 +199,39 @@ GEM
      activesupport (>= 6.0.0)
      redis (>= 4.2, < 6)
    language_server-protocol (3.17.0.5)
-    lexxy (0.9.24)
-      rails (>= 8.0.2)
    lint_roller (1.1.0)
    logger (1.7.0)
    loofah (2.25.2)
      crass (~> 1.0.2)
      nokogiri (>= 1.12.0)
-    mail (2.9.1)
+    mail (2.9.0)
      logger
      mini_mime (>= 0.1.1)
      net-imap
      net-pop
      net-smtp
-    marcel (2.1.0)
+    marcel (1.1.0)
    matrix (0.4.3)
    mini_magick (5.3.1)
      logger
    mini_mime (1.1.5)
-    minitest (6.0.6)
-      drb (~> 2.0)
-      prism (~> 1.5)
-    mocha (3.1.0)
+    minitest (5.26.2)
+    mocha (2.7.1)
      ruby2_keywords (>= 0.0.5)
    mono_logger (1.1.2)
    multi_json (1.17.0)
    mustermann (3.0.4)
      ruby2_keywords (~> 0.0.1)
-    net-imap (0.6.7)
+    net-http-persistent (4.0.6)
+      connection_pool (~> 2.2, >= 2.2.4)
+    net-imap (0.6.4.1)
      date
      net-protocol
    net-pop (0.1.2)
      net-protocol
-    net-protocol (0.4.0)
+    net-protocol (0.2.2)
      timeout
-    net-smtp (0.5.2)
+    net-smtp (0.5.1)
      net-protocol
    nio4r (2.7.5)
    nokogiri (1.19.4-aarch64-linux-gnu)
@@ -259,7 +242,7 @@ GEM
      racc (~> 1.4)
    nokogiri (1.19.4-x86_64-linux-gnu)
      racc (~> 1.4)
-    openssl (4.0.2)
+    openssl (3.3.0)
    ostruct (0.6.3)
    parallel (1.27.0)
    parser (3.3.9.0)
@@ -268,18 +251,18 @@ GEM
    platform_agent (1.0.1)
      activesupport (>= 5.2.0)
      useragent (~> 0.16.3)
-    pp (0.6.4)
+    pp (0.6.3)
      prettyprint
    prettyprint (0.2.0)
-    prism (1.9.0)
-    psych (5.5.0)
+    prism (1.4.0)
+    psych (5.2.6)
      date
      stringio
    public_suffix (6.0.2)
-    puma (8.0.2)
+    puma (7.2.1)
      nio4r (~> 2.0)
    racc (1.8.1)
-    rack (3.2.7)
+    rack (3.2.6)
    rack-protection (4.2.1)
      base64 (>= 0.1.0)
      logger (>= 1.6.0)
@@ -289,9 +272,8 @@ GEM
      rack (>= 3.0.0)
    rack-test (2.2.0)
      rack (>= 1.3)
-    rackup (2.3.1)
+    rackup (2.2.1)
      rack (>= 3)
-    ractor-dispatch (0.3.0)
    rails-dom-testing (2.3.0)
      activesupport (>= 5.0.0)
      minitest
@@ -304,24 +286,19 @@ GEM
      activesupport (> 3.1)
      railties (> 3.1)
    rainbow (3.1.1)
-    rake (13.4.2)
-    rbs (4.2.0)
-      logger
-      prism (>= 1.6.0)
-      tsort
-    rdoc (8.1.0)
+    rake (13.3.1)
+    rdoc (6.16.1)
      erb
-      prism (>= 1.6.0)
-      rbs (>= 4.0.0)
+      psych (>= 4.0.0)
      tsort
    redis (5.4.1)
      redis-client (>= 0.22.0)
-    redis-client (0.30.1)
+    redis-client (0.25.2)
      connection_pool
    redis-namespace (1.11.0)
      redis (>= 4)
    regexp_parser (2.11.2)
-    reline (0.7.0)
+    reline (0.6.3)
      io-console (~> 0.5)
    resque (2.7.0)
      mono_logger (~> 1)
@@ -336,29 +313,29 @@ GEM
      chunky_png (~> 1.0)
      rqrcode_core (~> 2.0)
    rqrcode_core (2.1.0)
-    rubocop (1.91.0)
-      json (>= 2.3)
+    rubocop (1.80.2)
+      json (~> 2.3)
      language_server-protocol (~> 3.17.0.2)
      lint_roller (~> 1.1.0)
-      parallel (>= 1.10)
+      parallel (~> 1.10)
      parser (>= 3.3.0.2)
      rainbow (>= 2.2.2, < 4.0)
      regexp_parser (>= 2.9.3, < 3.0)
-      rubocop-ast (>= 1.49.0, < 2.0)
+      rubocop-ast (>= 1.46.0, < 2.0)
      ruby-progressbar (~> 1.7)
      unicode-display_width (>= 2.4.0, < 4.0)
-    rubocop-ast (1.50.0)
+    rubocop-ast (1.46.0)
      parser (>= 3.3.7.2)
-      prism (~> 1.7)
-    rubocop-performance (1.27.0)
+      prism (~> 1.4)
+    rubocop-performance (1.25.0)
      lint_roller (~> 1.1)
-      rubocop (>= 1.89.0, < 2.0)
-      rubocop-ast (>= 1.47.1, < 2.0)
-    rubocop-rails (2.38.0)
+      rubocop (>= 1.75.0, < 2.0)
+      rubocop-ast (>= 1.38.0, < 2.0)
+    rubocop-rails (2.33.3)
      activesupport (>= 4.2.0)
      lint_roller (~> 1.1)
      rack (>= 1.1)
-      rubocop (>= 1.89.0, < 2.0)
+      rubocop (>= 1.75.0, < 2.0)
      rubocop-ast (>= 1.44.0, < 2.0)
    rubocop-rails-omakase (1.1.0)
      rubocop (>= 1.72)
@@ -369,21 +346,20 @@ GEM
      ffi (~> 1.12)
      logger
    ruby2_keywords (0.0.5)
-    rubyzip (3.7.0)
+    rubyzip (3.0.2)
    securerandom (0.4.1)
-    selenium-webdriver (4.49.0)
+    selenium-webdriver (4.35.0)
      base64 (~> 0.2)
      logger (~> 1.4)
      rexml (~> 3.2, >= 3.2.5)
      rubyzip (>= 1.2.2, < 4.0)
      websocket (~> 1.0)
-    sentry-rails (7.1.0)
-      railties (>= 5.2.0)
-      sentry-ruby (~> 7.1.0)
-    sentry-ruby (7.1.0)
+    sentry-rails (5.26.0)
+      railties (>= 5.0)
+      sentry-ruby (~> 5.26.0)
+    sentry-ruby (5.26.0)
      bigdecimal
      concurrent-ruby (~> 1.0, >= 1.0.2)
-      logger
    sinatra (4.2.1)
      logger (>= 1.6.0)
      mustermann (~> 3.0)
@@ -391,18 +367,18 @@ GEM
      rack-protection (= 4.2.1)
      rack-session (>= 2.0.0, < 3)
      tilt (~> 2.0)
-    sqlite3 (2.9.6-aarch64-linux-gnu)
-    sqlite3 (2.9.6-arm64-darwin)
-    sqlite3 (2.9.6-x86_64-darwin)
-    sqlite3 (2.9.6-x86_64-linux-gnu)
+    sqlite3 (2.9.5-aarch64-linux-gnu)
+    sqlite3 (2.9.5-arm64-darwin)
+    sqlite3 (2.9.5-x86_64-darwin)
+    sqlite3 (2.9.5-x86_64-linux-gnu)
    stimulus-rails (1.3.4)
      railties (>= 6.0.0)
-    stringio (3.2.0)
-    thor (1.5.0)
-    thruster (0.1.23-aarch64-linux)
-    thruster (0.1.23-arm64-darwin)
-    thruster (0.1.23-x86_64-darwin)
-    thruster (0.1.23-x86_64-linux)
+    stringio (3.1.8)
+    thor (1.4.0)
+    thruster (0.1.15-aarch64-linux)
+    thruster (0.1.15-arm64-darwin)
+    thruster (0.1.15-x86_64-darwin)
+    thruster (0.1.15-x86_64-linux)
    tilt (2.6.1)
    timeout (0.6.1)
    tsort (0.2.0)
@@ -413,9 +389,9 @@ GEM
    unicode-emoji (4.2.0)
    uri (1.1.1)
    useragent (0.16.11)
-    web-push (3.1.0)
+    web-push (3.0.2)
      jwt (~> 3.0)
-      openssl (>= 3.0)
+      openssl (~> 3.0)
    webmock (3.25.1)
      addressable (>= 2.8.0)
      crack (>= 0.3.2)
@@ -427,7 +403,7 @@ GEM
    websocket-extensions (0.1.5)
    xpath (3.2.0)
      nokogiri (~> 1.8)
-    zeitwerk (2.8.3)
+    zeitwerk (2.7.3)

 PLATFORMS
  aarch64-linux
@@ -448,12 +424,12 @@ DEPENDENCIES
  importmap-rails!
  jbuilder
  kredis
-  lexxy (~> 0.9.24)
  mocha
+  net-http-persistent
  ostruct
  platform_agent
  propshaft!
-  puma (~> 8.0)
+  puma (~> 7.2, >= 7.2.1)
  rails!
  rails_autolink
  redis (~> 5.4)
@@ -466,7 +442,6 @@ DEPENDENCIES
  sentry-ruby
  sqlite3
  stimulus-rails
-  surfguard!
  thruster
  turbo-rails!
  web-push
@@ -49,32 +49,6 @@ If you'd rather run the Docker image yourself, you can read more about that in t
 > that people have someone to contact if they need help with their account. If that bothers you, put in any
 > email address you want and create yourself a new admin account.

-Authenticated room, message, sidebar and search pages use a bounded 64 MiB cache per worker.
-Set `CAMPFIRE_RESPONSE_CACHE_MB=0` to disable it. Every request still checks authentication
-and room access; commits from any SQLite writer invalidate complete cached HTML and gzip bodies.
-Native HTML, JSON and stream fragments have a separate 64 MiB memory limit per worker;
-shared rate limits retain their existing store.
-
-## Other implementations
-
-Campfire also has implementations in Django, Laravel, Express, Elixir, Go, Rust and C:
-
-| HTTP workload (requests/sec) | Rails | [Django](https://github.com/basecamp/once-campfire-django) | [Laravel](https://github.com/basecamp/once-campfire-laravel) | [Express](https://github.com/basecamp/once-campfire-express) | [Elixir](https://github.com/basecamp/once-campfire-elixir) | [Go](https://github.com/basecamp/once-campfire-go) | [Rust](https://github.com/basecamp/once-campfire-rust) | [C](https://github.com/basecamp/once-campfire-c) |
-|---|---:|---:|---:|---:|---:|---:|---:|---:|
-| Room page | 4,101 | 1,507 | 3,872 | 42,636 | 5,350 | 53,060 | 106,494 | 137,524 |
-| Messages page | 4,115 | 1,596 | 3,995 | 74,362 | 5,712 | 54,800 | 102,697 | 144,642 |
-| Sidebar | 4,333 | 1,873 | 4,493 | 94,329 | 5,949 | 59,144 | 120,294 | 152,002 |
-| Search | 4,282 | 1,862 | 4,172 | 84,665 | 5,848 | 60,509 | 121,378 | 149,487 |
-| Post a message | 330 | 262 | 794 | 2,155 | 1,278 | 9,021 | 8,037 | 7,530 |
-| Backend KLOC | 5.5 | 5.3 | 4.1 | 6.8 | 11.6 | 23.2 | 30.7 | 94.8 |
-
-KLOC counts backend code plus executable code in templates; excludes plain HTML, frontend, tests, dependencies and generated files.
-
-[Shared verification](https://github.com/basecamp/once-campfire-verification) · [Detailed results](https://github.com/basecamp/once-campfire-verification/blob/main/docs/performance-review.md).
-
-Measured with 16 concurrent clients on an AMD Ryzen AI MAX+ 395 with 32 GB RAM,
-with four hardware cores allocated to each app.
-
 ## Development

 You are welcome - and encouraged - to modify Campfire to your liking.
@@ -83,7 +57,3 @@ Please see our [development guide](docs/development.md) for how to get Campfire
 ## Security

 See [SECURITY.md](SECURITY.md) for how to report a vulnerability and a description of our trust model.
-
-Browser writes use Rails’ `Sec-Fetch-Site` header-only protection and `Origin` check.
-HTTPS requires browser metadata; plain HTTP retains the missing-header fallback.
-Forms contain no CSRF tokens. Existing cookies, bot APIs and signed uploads remain compatible.
@@ -1,160 +1,165 @@
-/* Resolve Lexxy's palette to Campfire's, in the editor and in rendered messages,
-   so everything follows Campfire's light/dark color scheme */
-.lexxy-content {
-  --lexxy-color-canvas: transparent;
-  --lexxy-color-text: var(--color-text);
-  --lexxy-color-text-subtle: var(--color-text);
-  --lexxy-color-link: var(--color-link);
-  --lexxy-color-ink: var(--color-text);
-  --lexxy-color-ink-inverted: var(--color-text-reversed);
-  --lexxy-color-ink-medium: var(--color-text);
-  --lexxy-color-ink-lighter: var(--color-border-darker);
-  --lexxy-color-ink-lightest: var(--color-bg);
-  --lexxy-color-selected: var(--color-selected, var(--color-bg));
-  --lexxy-color-code-bg: var(--color-bg);
+trix-toolbar {
+  display: none;
+  inset: auto 0 0 0;
+  min-width: 0;
+  position: sticky;
+  z-index: 3;

-  /* Campfire's message lines stack without extra block margins */
-  --lexxy-content-margin: 0;
+  .trix-dialog {
+    bottom: 3rem !important;
+    top: auto !important;
+  }
+
+  .trix-button--icon {
+    height: auto !important;
+  }
+
+  .trix-dialog {
+    background-color: var(--color-bg) !important;
+    border-radius: 1rem !important;
+    border: 2px solid var(--color-text) !important;
+    box-shadow: none !important;
+    color: var(--color-text) !important;
+    gap: var(--inline-space);
+    padding: 0 !important;
+    overflow: clip;
+
+    .trix-input {
+      background: transparent !important;
+      border: 0 !important;
+      color: var(--color-text) !important;
+      font-size: max(16px, 1em) !important;
+      padding: var(--input-padding, 0.5em 0.8em) !important;
+    }
+
+    .trix-button {
+      color: var(--color-text) !important;
+    }
+  }
+
+  .trix-dialog--link {
+    .trix-dialog__link-fields {
+      align-items: center;
+      padding-right: 0.3em;
+    }
+
+    [value="Link"],
+    [value="Unlink"] {
+      width: 2.6em;
+      aspect-ratio: 1 / 1;
+      background-position: center center;
+      background-repeat: no-repeat;
+      text-indent: -9999%;
+      padding: 0;
+    }
+
+    [value="Link"] { background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' fill='none'%3E%3Cpath fill='%23000' fill-rule='evenodd' d='M18.948 5.258a4.337 4.337 0 0 0-6.108 0L11.217 6.87a.993.993 0 0 0 0 1.41c.392.39 1.027.39 1.418 0l1.623-1.613a2.323 2.323 0 0 1 3.271 0 2.29 2.29 0 0 1 0 3.251l-2.393 2.38a3.021 3.021 0 0 1-4.255 0l-.05-.049a1.007 1.007 0 0 0-1.418 0 .993.993 0 0 0 0 1.41l.05.049a5.036 5.036 0 0 0 7.091 0l2.394-2.38a4.275 4.275 0 0 0 0-6.072Zm-13.683 13.6a4.337 4.337 0 0 0 6.108 0l1.262-1.255a.993.993 0 0 0 0-1.41 1.007 1.007 0 0 0-1.418 0L9.954 17.45a2.323 2.323 0 0 1-3.27 0 2.29 2.29 0 0 1 0-3.251l2.344-2.331a2.579 2.579 0 0 1 3.631 0c.392.39 1.027.39 1.419 0a.993.993 0 0 0 0-1.41 4.593 4.593 0 0 0-6.468 0l-2.345 2.33a4.275 4.275 0 0 0 0 6.072Z' clip-rule='evenodd'/%3E%3C/svg%3E"); }
+
+    [value="Unlink"] {
+      background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' fill='none'%3E%3Cpath fill='%23000' fill-rule='evenodd' d='M18.954 5.264a3.58 3.58 0 0 0-5.04 0l-2.157 2.144a.993.993 0 0 0 0 1.41c.392.39 1.027.39 1.418 0l2.157-2.144a1.565 1.565 0 0 1 2.204 0c.607.603.609 1.58.005 2.186l-2.348 2.355a.993.993 0 0 0 .006 1.41 1.007 1.007 0 0 0 1.419-.007l2.347-2.354a3.528 3.528 0 0 0-.01-5ZM5.257 18.852a3.59 3.59 0 0 0 5.041.015l2.6-2.554a.993.993 0 0 0 .01-1.41 1.007 1.007 0 0 0-1.419-.009l-2.6 2.554c-.615.603-1.603.6-2.214-.006a1.554 1.554 0 0 1-.012-2.195l2.539-2.58a.993.993 0 0 0-.016-1.41 1.007 1.007 0 0 0-1.418.015l-2.539 2.58a3.54 3.54 0 0 0 .028 5Z' clip-rule='evenodd'/%3E%3Cpath stroke='%23000' stroke-linecap='round' stroke-width='2' d='M10.233 5.78V3.769M5.968 9.802H4.21M7.343 7.107 5.968 5.781M14.348 17.523v2.013M18.613 13.502h1.758M17.238 16.196l1.375 1.327'/%3E%3C/svg%3E%0A");
+      border-top-right-radius: 1em !important;
+      border-bottom-right-radius: 1em !important;
+    }
+  }
 }

-lexxy-editor {
+trix-editor {
  &.input {
-    --lexxy-editor-padding: 0;
-
-    /* One line high when empty. Lexxy derives this from attr(rows lh, 8lh),
-       whose resolution differs between Chrome versions — pin it instead of
-       risking the 8-line fallback */
-    --lexxy-editor-rows: 1lh;
-
-    background: transparent;
-    border: 0;
-    border-radius: 0;
    min-height: 24px;
  }

  .attachment--content {
    margin: 0;
    display: inline-flex;
-  }
-}

-/* The mentions menu needs a solid surface — the editor's transparent canvas
-   would let messages show through it */
-.lexxy-prompt-menu {
-  --lexxy-color-canvas: var(--color-bg);
-
-  border: 1px solid var(--color-border-dark);
-}
-
-/* Same for the code block language picker: with a transparent canvas the
-   native dropdown renders white-on-white in dark mode */
-lexxy-editor lexxy-code-language-picker select {
-  background-color: var(--color-bg);
-  color: var(--color-text);
-
-  option {
-    background-color: var(--color-bg);
-    color: var(--color-text);
-  }
-}
-
-/* The toolbar only shows when rich text mode is toggled on (see composer.css) */
-lexxy-toolbar {
-  /* Wide, airy button spacing like the Trix toolbar */
-  --lexxy-toolbar-gap: 1.3em;
-
-  /* Match the compact size of the Trix toolbar buttons */
-  --lexxy-toolbar-button-size: 1.7em;
-  --lexxy-toolbar-icon-size: 1.125em;
-
-  display: none;
-  border-block-end: 0;
-  min-width: 0;
-  z-index: 3;
-
-  /* Tools Campfire doesn't offer, matching the Trix toolbar: underline,
-     color highlights, tables, dividers and undo/redo (history tools were
-     hidden under Trix as well) */
-  button[name="underline"],
-  button[name="table"],
-  button[name="divider"],
-  button[name="undo"],
-  button[name="redo"],
-  lexxy-highlight-dropdown {
-    display: none !important;
-  }
-
-  /* No group separator pipes, like the Trix toolbar */
-  .lexxy-editor__toolbar-button.lexxy-editor__toolbar-group-end::after {
-    display: none;
-  }
-
-  /* Dropdown panels: a solid surface with a uniform radius. Lexxy derives
-     the panel's radius and gap from --lexxy-toolbar-gap, which Campfire
-     repurposes for button spacing */
-  .lexxy-editor__toolbar-dropdown [data-dropdown-panel] {
-    --lexxy-color-canvas: var(--color-bg);
-    --lexxy-color-ink-lightest: var(--color-message-bg);
-    --lexxy-color-selected: var(--color-selected);
-    --lexxy-color-selected-hover: var(--color-message-bg);
-
-    border: 1px solid var(--color-border-dark);
-    border-radius: 0.5em;
-    gap: 0.25em;
-    padding: 0.25em;
-  }
-
-  .lexxy-editor__toolbar-dropdown > .lexxy-editor__toolbar-button[aria-expanded="true"] {
-    border-radius: var(--lexxy-radius);
-  }
-}
-
-/* Attachment markup contains formatting whitespace that must not turn into
-   line breaks under the editor's white-space: pre-wrap */
-lexxy-editor action-text-attachment {
-  white-space: normal;
-}
-
-action-text-attachment[content-type~="application/vnd.campfire.mention"] {
-  display: inline-flex;
-  margin: 0;
-  padding: 0;
-  position: relative;
-}
-
-action-text-attachment[content-type~="application/vnd.actiontext.opengraph-embed"] {
-  lexxy-editor & {
-    display: block;
-    inline-size: fit-content;
-    max-inline-size: 100%;
-  }
-
-  /* No selection background — it peeks through the card's rounded corners.
-     The lexxy-editor prefix out-specifies Lexxy's own selection rule. */
-  lexxy-editor &.node--selected {
-    --lexxy-attachment-bg-color: transparent;
-  }
-
-  /* A prominent remove button on the card's top edge, horizontally
-     centered, like the Trix one. The lexxy-editor prefix out-specifies
-     Lexxy's own placement rules. */
-  lexxy-editor & lexxy-node-delete-button {
-    inset-block-start: 0;
-    inset-inline-start: 50%;
-    inset-inline-end: auto;
-    transform: translate(-50%, -50%);
-
-    .lexxy-floating-controls__group {
-      --button-size: 2.2em;
-
-      background-color: var(--color-negative);
-      border-radius: 50%;
-      color: white;
+    .attachment__toolbar {
+      top: 0;
+      z-index: 2;
    }
  }
 }

-.lexxy-content {
+.trix-button-group--file-tools,
+.trix-button-group--history-tools {
+  display: none !important;
+}
+
+.trix-button-group,
+.trix-button {
+  border: 0 !important;
+  margin: 0 !important;
+  border-radius: 0.3em !important;
+  box-shadow: none;
+
+  &::before {
+    opacity: 1 !important;
+  }
+
+  @media (prefers-color-scheme: dark) {
+    &::before {
+      filter: invert(100);
+    }
+  }
+
+  &.trix-active {
+    background-color: var(--color-text) !important;
+
+    &::before {
+      filter: invert(100);
+    }
+
+    @media (prefers-color-scheme: dark) {
+      &::before {
+        filter: invert(0);
+      }
+    }
+  }
+
+  &.trix-button--remove {
+    background-color: var(--color-negative);
+    border-radius: 1.8em !important;
+
+    &::before {
+      filter: invert(100);
+      background-size: 70%;
+      background-image: url("minus.svg");
+    }
+  }
+}
+
+[data-trix-content-type~='application/vnd.campfire.mention'] {
+  .trix-button-group {
+    display: inline;
+  }
+}
+
+[data-trix-content-type~="application/vnd.actiontext.opengraph-embed"] {
+  * {
+    text-decoration: none;
+  }
+
+  trix-editor & {
+    display: block;
+    inline-size: fit-content;
+    max-inline-size: 100%;
+  }
+}
+
+.trix-button:not(.trix-button--remove) {
+  @media (any-hover: hover) {
+    &:where(:not(:active):hover) {
+      filter: brightness(0.9);
+      background-color: var(--color-bg);
+    }
+  }
+
+  &:disabled {
+    opacity: 0.33;
+  }
+}
+
+trix-editor,
+.trix-content {
  pre {
    background-color: var(--color-bg) !important;
    border-radius: 0.5em;
@@ -174,13 +179,11 @@ action-text-attachment[content-type~="application/vnd.actiontext.opengraph-embed
  blockquote {
    border: 0 solid var(--color-border-darker) !important;
    border-inline-start-width: var(--blockquote-border) !important;
-    font-style: normal;
    margin: 0 var(--blockquote-margin) !important;
    padding-inline-start: var(--blockquote-padding) !important;
  }

  cite {
-    display: block;
    margin-inline-start: calc(var(--blockquote-padding));
    font-style: normal;
    font-size: 0.8rem;
@@ -196,14 +199,13 @@ action-text-attachment[content-type~="application/vnd.actiontext.opengraph-embed
    color: var(--color-link);
  }

-  /* The composer's mention menu is a list inside the editor too, and keeps Lexxy's own spacing */
-  ul:not(.lexxy-prompt-menu),
+  ul,
  ol {
    margin: 0 !important;
    padding: 0 !important;
  }

-  li:not(.lexxy-prompt-menu__item) {
+  li {
    margin: 0 0 0 var(--inline-space-double) !important;
    padding: 0 !important;
  }
@@ -33,7 +33,7 @@
  }
 }

-action-text-attachment[content-type~='application/vnd.campfire.mention'] {
+[data-trix-content-type~='application/vnd.campfire.mention'] {
  display: inline-flex;
  margin: 0;
  padding: 0;
@@ -100,42 +100,16 @@
  }

  .composer--rich-text {
-    lexxy-toolbar {
-      display: flex;
+    trix-toolbar {
+      display: block;
    }

-    lexxy-editor.input {
+    trix-editor.input {
      margin-block-start: var(--block-space-half);
    }
  }

-  /* In the message composer the toolbar goes below the text, on the same
-     row as the surrounding action buttons, like the Trix toolbar did.
-     The edit composer keeps it on top. */
-  #composer.composer--rich-text lexxy-editor.input {
-    display: flex;
-    flex-direction: column;
-
-    /* Sit the toolbar row on the same baseline as the composer's round
-       buttons, which pull themselves down with negative margins */
-    margin-block-end: -0.25em;
-
-    .lexxy-editor__content {
-      order: -1;
-    }
-
-    lexxy-toolbar {
-      margin-block-start: 0.4em;
-
-      /* Dropdowns open upward — the toolbar sits at the bottom of the screen */
-      [data-dropdown-panel] {
-        inset-block-start: auto;
-        inset-block-end: 100%;
-      }
-    }
-  }
-
-  .composer--edit lexxy-toolbar {
+  .composer--edit trix-toolbar {
    border-block-end: 1px solid var(--color-border);
    margin-inline: -0.8em;
    padding-inline: 0.3em;
@@ -143,16 +117,6 @@
  }
 }

-/* The editor's container-type prevents it from sizing the message bubble by
-   its content, so give the bubble the full available width while editing */
-.message__body:has(.composer--edit) {
-  inline-size: 100%;
-
-  .message__body-content--editing {
-    flex-grow: 1;
-  }
-}
-
 /* Typing indicator */
 .typing-indicator {
  inset-block-start: var(--indicator-position, 0.15rem);
@@ -1,5 +1,5 @@
-
-.lexxy-content {
+trix-editor,
+.trix-content {
  .og-embed {
    background: var(--color-bg);
    border: 1px solid var(--color-border-dark);
@@ -15,7 +15,7 @@
      flex-direction: row;
    }

-    &.og-embed--twitter-avatar {
+    .cf-twitter-avatar & {
      flex-direction: row;
    }
  }
@@ -35,11 +35,10 @@

  .og-embed__title {
    font-weight: 600;
+    text-decoration: underline;

-    /* Underline the link itself so the line is link-colored */
    a {
      color: var(--color-link);
-      text-decoration: underline;
    }
  }

@@ -54,11 +53,7 @@
      inline-size: 15dvw;
    }

-    /* block-size/border-radius guard against Lexxy's 1em round avatar
-       styling for custom attachment images */
    > * {
-      block-size: auto;
-      border-radius: 0;
      object-position: top right;
      inline-size: 100%;
      object-fit: contain;
@@ -68,7 +63,7 @@
      }
    }

-    .og-embed--twitter-avatar & {
+    .cf-twitter-avatar & {
      aspect-ratio: 1;
      border-radius: 50%;
      inline-size: 2lh;
@@ -537,7 +537,7 @@ img.message__attachment {
    padding: var(--content-padding-block) 0 var(--content-padding-block) var(--content-padding-inline);
    text-shadow: 0 0 3px var(--color-text-reversed);

-    .lexxy-content {
+    .trix-content {
      font-size: 2.4em;
      line-height: 1.4;
    }
@@ -22,6 +22,6 @@ class PresenceChannel < RoomChannel
    end

    def broadcast_read_room
-      ActionCable.server.broadcast "user_#{current_user.id}_reads", { room_id: membership.room_id, at: Time.current.to_f }
+      ActionCable.server.broadcast "user_#{current_user.id}_reads", { room_id: membership.room_id }
    end
 end
@@ -2,6 +2,7 @@ class Accounts::LogosController < ApplicationController
  include ActiveStorage::Streaming, ActionView::Helpers::AssetUrlHelper

  allow_unauthenticated_access only: :show
+  content_security_policy false, only: :show
  before_action :ensure_can_administer, only: :destroy

  def show
@@ -2,7 +2,7 @@ class Accounts::UsersController < ApplicationController
  before_action :ensure_can_administer, :set_user, only: %i[ update destroy ]

  def index
-    set_page_and_extract_portion_from User.visible_to(Current.user).ordered.member, per_page: 500
+    set_page_and_extract_portion_from User.active.ordered.without_bots, per_page: 500
  end

  def update
@@ -3,9 +3,9 @@ class AccountsController < ApplicationController
  before_action :set_account

  def edit
-    users = User.visible_to(Current.user).ordered
-    @administrators = users.administrator
-    set_page_and_extract_portion_from users.member, per_page: 500
+    users = account_users.ordered.without_bots
+    @administrators, @members = users.partition(&:administrator?)
+    set_page_and_extract_portion_from users, per_page: 500
  end

  def update
@@ -21,4 +21,12 @@ class AccountsController < ApplicationController
    def account_params
      params.require(:account).permit(:name, :logo, settings: {})
    end
+
+    def account_users
+      if Current.user.can_administer?
+        User.where(status: [ :active, :banned ])
+      else
+        User.active
+      end
+    end
 end
@@ -1,4 +1,4 @@
 class ApplicationController < ActionController::Base
-  include AllowBrowser, Authentication, Authorization, BlockBannedRequests, SetCurrentRequest, SetPlatform, TrackedRoomVisit, VersionHeaders, CachedResponses
+  include AllowBrowser, Authentication, Authorization, BlockBannedRequests, SetCurrentRequest, SetPlatform, TrackedRoomVisit, VersionHeaders
  include Turbo::Streams::Broadcasts, Turbo::Streams::StreamName
 end
@@ -1,26 +1,11 @@
 class Autocompletable::UsersController < ApplicationController
  def index
    set_page_and_extract_portion_from find_autocompletable_users.with_attached_avatar.ordered, per_page: 20
-
-    respond_to do |format|
-      format.html { render layout: false } # <lexxy-prompt-item> elements for the mentions prompt
-      format.json
-    end
  end

  private
    def find_autocompletable_users
-      if query.present?
-        users_scope.active.filtered_by(query)
-      else
-        users_scope.active
-      end
-    end
-
-    # The rich text editor's mentions prompt filters with `filter`, the
-    # autocomplete inputs with `query`
-    def query
-      params[:filter].presence || params[:query].presence
+      params[:query].present? ? users_scope.active.filtered_by(params[:query]) : users_scope.active
    end

    def users_scope
@@ -1,9 +0,0 @@
-module ActiveStorageAuthentication
-  extend ActiveSupport::Concern
-  include Authentication::SessionLookup
-
-  private
-    def require_active_storage_authentication
-      head :unauthorized unless find_session_by_cookie
-    end
-end
@@ -7,7 +7,7 @@ module Authentication
    before_action :deny_bots
    helper_method :signed_in?

-    protect_from_forgery using: :header_only, with: :exception, unless: -> { authenticated_by.bot_key? }
+    protect_from_forgery with: :exception, unless: -> { authenticated_by.bot_key? }
  end

  class_methods do
@@ -71,13 +71,6 @@ module Authentication
      Current.session&.destroy!
      reset_session
      remove_authentication_cookie
-      disconnect_remote_connections
-    end
-
-    def disconnect_remote_connections
-      Current.user&.reset_remote_connections
-    rescue => error
-      Rails.logger.warn "Could not disconnect remote connections on sign out: #{error.class}"
    end

    def authenticated_as(session)
@@ -1,12 +1,7 @@
 module Authentication::SessionLookup
  def find_session_by_cookie
    if token = cookies.signed[:session_token]
-      version = @response_cache_version if @response_cache_version && (request.get? || request.head?)
-      session, user = RecordCache.fetch([ "session", Digest::SHA256.hexdigest(token.to_s) ], version) do
-        session = Session.find_by(token: token)
-        [ session, session&.user ]
-      end
-      session&.tap { |record| record.user = user }
+      Session.find_by(token: token)
    end
  end
 end
@@ -1,118 +0,0 @@
-require "zlib"
-
-module CachedResponses
-  extend ActiveSupport::Concern
-
-  CACHE_HEADERS = %w[ content-type content-encoding cache-control etag last-modified vary ].freeze
-
-  included do
-    prepend_before_action :capture_response_cache_version
-  end
-
-  def perform_caching
-    return false unless super && @response_cache_version.present? && !FragmentCache.transaction_open?
-
-    # Check again after authentication, before the first native fragment lookup.
-    # Later renders retain this immutable namespace and cannot poison a new epoch.
-    unless defined?(@fragment_cache_snapshot_valid)
-      @fragment_cache_snapshot_valid = @response_cache_version == ResponseCache.instance.version
-    end
-    @fragment_cache_snapshot_valid
-  end
-
-  # Keep the class store (including shared rate limits) and Rails.cache unchanged.
-  def cache_store
-    FragmentCache.store
-  end
-
-  def combined_fragment_cache_key(key)
-    @fragment_cache_context ||= [
-      request.base_url, request.script_name, request.format.to_s, I18n.locale,
-      Current.user&.id, (Digest::SHA256.hexdigest(Current.session.token) if Current.session)
-    ].freeze
-    version = @response_cache_version unless Array(key).flatten.any? { |part| part.is_a?(FragmentCache::ContentKey) }
-    super([ version, @fragment_cache_context, key ])
-  end
-
-  private
-    def read_record_cache_version
-      @response_cache_version if request.get? || request.head?
-    end
-
-    def capture_response_cache_version
-      # Capture for native HTML/JSON/stream renders too, even with page reuse off.
-      # Detached renderers do not run callbacks and therefore render uncached.
-      @response_cache_version = ResponseCache.instance.version
-    end
-
-    # Register after room authorization, but before presentation queries.
-    def cache_read_response
-      if cacheable_read_request?
-        encoding = Rack::Utils.select_best_encoding(%w[ gzip identity ], Rack::Utils.q_values(request.headers["Accept-Encoding"]))
-        return yield unless encoding
-
-        key = response_cache_key(encoding)
-        return yield if key.bytesize > ResponseCache::MAX_KEY_BYTES
-
-        entry = ResponseCache.instance.read(key, @response_cache_version)
-        rendered = false
-        unless entry
-          ResponseCache.instance.synchronize_render(key, @response_cache_version) do
-            entry = ResponseCache.instance.read(key, @response_cache_version)
-            if !entry && ResponseCache.instance.version == @response_cache_version
-              original_session = session.to_hash.deep_dup
-              yield
-              rendered = true
-              entry = cache_completed_response(key, original_session, encoding)
-            end
-          end
-        end
-
-        if entry
-          response.headers.merge!(entry[:headers])
-          response.headers.delete("Content-Length")
-          self.response_body = entry[:body]
-        elsif !rendered
-          # A queued request retains its pre-auth snapshot. If it has expired,
-          # render outside the stripe instead of blocking the next generation.
-          yield
-        end
-      else
-        yield
-      end
-    end
-
-    def cache_completed_response(key, original_session, encoding)
-      if response.status == 200 && response.media_type == "text/html" && session.to_hash == original_session && !response.headers["Content-Encoding"]
-        body = encoding == "gzip" ? Zlib.gzip(response.body) : response.body
-        unless body.empty? || response.headers["ETag"] || response.headers["Last-Modified"]
-          # Match Rack::ETag once, rather than hashing the same bytes on each hit.
-          response.headers["ETag"] = %(W/"#{Digest::SHA256.hexdigest(body).byteslice(0, 32)}")
-        end
-        response.headers["Content-Encoding"] = "gzip" if encoding == "gzip"
-        response.headers["Vary"] = (response.headers["Vary"].to_s.split(/,\s*/) | [ "Accept-Encoding" ]).join(", ")
-        headers = response.headers.slice(*CACHE_HEADERS).to_h.freeze
-        entry = { body: body.freeze, headers: headers }.freeze
-        ResponseCache.instance.write(key, @response_cache_version, entry)
-        entry
-      end
-    end
-
-    def cacheable_read_request?
-      ResponseCache.instance.budget.positive? && @response_cache_version && request.get? && request.format.html? && Current.session &&
-        !authenticated_by.bot_key? && flash.empty? &&
-        !request.headers["If-None-Match"] && !request.headers["If-Modified-Since"] &&
-        !Rails.application.config.content_security_policy_nonce_generator &&
-        !FragmentCache.transaction_open?
-    end
-
-    def response_cache_key(encoding)
-      ActiveSupport::JSON.encode([
-        controller_path, request.fullpath, request.base_url, request.user_agent, encoding,
-        request.headers["Accept"], request.headers["Turbo-Frame"], I18n.locale,
-        # Old token-bearing installation cookies remain valid without affecting HTML.
-        Current.user.id, Current.session.token, session.to_hash.except("_csrf_token"),
-        cookies.to_h.except("_campfire_session", "session_token")
-      ])
-    end
-end
@@ -1,12 +0,0 @@
-module RawRequestBody
-  extend ActiveSupport::Concern
-
-  private
-
-  def raw_request_body
-    request.body.rewind
-    request.body.read.force_encoding("UTF-8")
-  ensure
-    request.body.rewind
-  end
-end
@@ -7,10 +7,7 @@ module RoomScoped

  private
    def set_room
-      @membership, @room = RecordCache.fetch([ "membership", Current.user.id, params[:room_id] ], read_record_cache_version) do
-        membership = Current.user.memberships.find_by!(room_id: params[:room_id])
-        [ membership, membership.room ]
-      end
-      @membership.room = @room
+      @membership = Current.user.memberships.find_by!(room_id: params[:room_id])
+      @room = @membership.room
    end
 end
@@ -8,6 +8,6 @@ module SetCurrentRequest
  end

  def default_url_options
-    { host: Current.request_host, port: Current.request&.optional_port, protocol: Current.request_protocol }.compact_blank
+    { host: Current.request_host, protocol: Current.request_protocol }.compact_blank
  end
 end
@@ -1,39 +0,0 @@
-class Messages::Boosts::ByBotsController < Messages::BoostsController
-  include RawRequestBody
-
-  allow_bot_access only: %i[ create destroy ]
-
-  before_action :ensure_content_present, only: :create
-
-  def create
-    @boost = @message.boosts.create!(boost_params)
-
-    broadcast_create
-    render :show, status: :created
-  end
-
-  private
-    def set_message
-      if room = Current.user.rooms.find_by(id: params[:room_id])
-        @message = room.messages.find_by(id: params[:message_id])
-      end
-
-      head :not_found unless @message
-    end
-
-    def set_boost
-      super
-    rescue ActiveRecord::RecordNotFound
-      head :not_found
-    end
-
-    def ensure_content_present
-      if raw_request_body.blank?
-        head :unprocessable_content
-      end
-    end
-
-    def boost_params
-      { content: raw_request_body }
-    end
-end
@@ -1,6 +1,5 @@
 class Messages::BoostsController < ApplicationController
  before_action :set_message
-  before_action :set_boost, only: :destroy

  def index
  end
@@ -16,6 +15,7 @@ class Messages::BoostsController < ApplicationController
  end

  def destroy
+    @boost = Current.user.boosts.find(params[:id])
    @boost.destroy!

    broadcast_remove
@@ -26,17 +26,13 @@ class Messages::BoostsController < ApplicationController
      @message = Current.user.reachable_messages.find(params[:message_id])
    end

-    def set_boost
-      @boost = @message.boosts.find_by!(id: params[:id], booster: Current.user)
-    end
-
    def boost_params
      params.require(:boost).permit(:content)
    end

    def broadcast_create
      @boost.broadcast_append_to @boost.message.room, :messages,
-        target: helpers.dom_id(@boost.message, :boosts), partial: "messages/boosts/boost", attributes: { maintain_scroll: true }
+        target: "boosts_message_#{@boost.message.client_message_id}", partial: "messages/boosts/boost", attributes: { maintain_scroll: true }
    end

    def broadcast_remove
@@ -1,64 +1,24 @@
 class Messages::ByBotsController < MessagesController
-  include RawRequestBody
-
-  allow_bot_access only: %i[ index create update destroy ]
-
-  before_action :set_room
-  before_action :set_message, only: %i[ update destroy ]
-  before_action :ensure_can_administer, only: %i[ update destroy ]
-  before_action :ensure_body_or_attachment_present, only: :create
-
-  def index
-    @messages = find_paged_messages
-    set_pagination_headers
-  end
+  allow_bot_access only: :create

  def create
    super
    head :created, location: message_url(@message)
  end

-  def destroy
-    super
-    head :no_content
-  end
-
  private
-    def set_room
-      @room = Current.user.rooms.find_by(id: params[:room_id])
-
-      head :not_found unless @room
-    end
-
-    def ensure_body_or_attachment_present
-      if params[:attachment].blank? && raw_request_body.blank?
-        head :unprocessable_content
-      end
-    end
-
-    def set_pagination_headers
-      headers["X-Total-Count"] = @room.messages_count.to_s
-
-      if next_page = next_page_params
-        headers["Link"] = %(<#{room_bot_messages_url(@room, params[:bot_key], **next_page)}>; rel="next")
-      end
-    end
-
-    def next_page_params
-      if @messages.any?
-        if params[:after].present?
-          { after: @messages.last.id } if @room.messages.after(@messages.last).exists?
-        else
-          { before: @messages.first.id } if @room.messages.before(@messages.first).exists?
-        end
-      end
-    end
-
    def message_params
      if params[:attachment]
        params.permit(:attachment)
      else
-        { body: raw_request_body }
+        reading(request.body) { |body| { body: body } }
      end
    end
+
+    def reading(io)
+      io.rewind
+      yield io.read.force_encoding("UTF-8")
+    ensure
+      io.rewind
+    end
 end
@@ -4,7 +4,6 @@ class MessagesController < ApplicationController
  before_action :set_room, except: :create
  before_action :set_message, only: %i[ show edit update destroy ]
  before_action :ensure_can_administer, only: %i[ edit update destroy ]
-  around_action :cache_read_response, only: :index

  layout false, only: :index

@@ -12,13 +11,7 @@ class MessagesController < ApplicationController
    @messages = find_paged_messages

    if @messages.any?
-      body = render_to_string(:index)
-      # Creator, body and boost edits can change HTML without touching messages.
-      fresh_when etag: Digest::SHA256.hexdigest(body), template: false
-      unless performed?
-        response.content_type = "text/html"
-        self.response_body = body
-      end
+      fresh_when @messages
    else
      head :no_content
    end
@@ -28,9 +21,7 @@ class MessagesController < ApplicationController
    set_room
    @message = @room.messages.create_with_attachment!(message_params)

-    # Both deliveries contain the same token-free, viewer-independent markup.
-    @message_html = render_to_string partial: "messages/message", formats: :html, locals: { message: @message }
-    @message.broadcast_create(html: @message_html)
+    @message.broadcast_create
    deliver_webhooks_to_bots
  rescue ActiveRecord::RecordNotFound
    render action: :room_not_found
@@ -46,11 +37,7 @@ class MessagesController < ApplicationController
    @message.update!(message_params)

    @message.broadcast_replace_to @room, :messages, target: [ @message, :presentation ], partial: "messages/presentation", attributes: { maintain_scroll: true }
-
-    respond_to do |format|
-      format.html { redirect_to room_message_url(@room, @message) }
-      format.json { render :show }
-    end
+    redirect_to room_message_url(@room, @message)
  end

  def destroy
@@ -71,11 +58,11 @@ class MessagesController < ApplicationController
    def find_paged_messages
      case
      when params[:before].present?
-        @room.messages.with_presentation.page_before(@room.messages.find(params[:before]))
+        @room.messages.with_creator.page_before(@room.messages.find(params[:before]))
      when params[:after].present?
-        @room.messages.with_presentation.page_after(@room.messages.find(params[:after]))
+        @room.messages.with_creator.page_after(@room.messages.find(params[:after]))
      else
-        @room.messages.with_presentation.last_page
+        @room.messages.with_creator.last_page
      end
    end

@@ -1,5 +1,6 @@
 class QrCodeController < ApplicationController
  allow_unauthenticated_access
+  content_security_policy false

  def show
    url = Base64.urlsafe_decode64(params[:id])
@@ -7,7 +8,5 @@ class QrCodeController < ApplicationController

    expires_in 1.year, public: true
    render plain: qr_code, content_type: "image/svg+xml"
-  rescue ArgumentError, RQRCodeCore::QRCodeRunTimeError
-    head :bad_request
  end
 end
@@ -4,8 +4,8 @@ class Rooms::RefreshesController < ApplicationController
  before_action :set_last_updated_at

  def show
-    @new_messages = @room.messages.with_presentation.page_created_since(@last_updated_at)
-    @updated_messages = @room.messages.without(@new_messages).with_presentation.page_updated_since(@last_updated_at)
+    @new_messages = @room.messages.with_creator.page_created_since(@last_updated_at)
+    @updated_messages = @room.messages.without(@new_messages).with_creator.page_updated_since(@last_updated_at)
  end

  private
@@ -2,7 +2,6 @@ class RoomsController < ApplicationController
  before_action :set_room, only: %i[ show destroy ]
  before_action :ensure_can_administer, only: %i[ destroy ]
  before_action :remember_last_room_visited, only: :show
-  around_action :cache_read_response, only: :show

  def index
    redirect_to room_url(Current.user.rooms.last)
@@ -13,7 +12,7 @@ class RoomsController < ApplicationController
  end

  def destroy
-    @room.destroy_later
+    @room.destroy

    broadcast_remove_room
    redirect_to root_url
@@ -21,10 +20,7 @@ class RoomsController < ApplicationController

  private
    def set_room
-      room = RecordCache.fetch([ "room", self.class.name, Current.user.id, params[:room_id] || params[:id] ], read_record_cache_version) do
-        [ room_scope.find_by(id: params[:room_id] || params[:id]) ]
-      end.first
-      if room
+      if room = room_scope.find_by(id: params[:room_id] || params[:id])
        @room = room
      else
        redirect_to root_url, alert: "Room not found or inaccessible"
@@ -48,9 +44,9 @@ class RoomsController < ApplicationController
    end

    def find_messages
-      messages = @room.messages.with_presentation
+      messages = @room.messages.with_creator.with_attachment_details.with_boosts

-      if params[:message_id].present? && (show_first_message = messages.find_by(id: params[:message_id]))
+      if show_first_message = messages.find_by(id: params[:message_id])
        @messages = messages.page_around(show_first_message)
      else
        @messages = messages.last_page
@@ -1,5 +1,4 @@
 class SearchesController < ApplicationController
-  around_action :cache_read_response, only: :index
  before_action :set_messages

  def index
@@ -21,7 +20,7 @@ class SearchesController < ApplicationController
  private
    def set_messages
      if query.present?
-        @messages = Message.search_reachable(Current.user, query)
+        @messages = Current.user.reachable_messages.search(query).last(100)
      else
        @messages = Message.none
      end
@@ -1,9 +1,8 @@
 class UnfurlLinksController < ApplicationController
-  # The pasted link decides which hosts an unfurl looks up and fetches from, and how quickly they answer.
-  DEADLINE = 10.seconds
-
  def create
-    if opengraph = unfurl(url_param)
+    opengraph = Opengraph::Metadata.from_url(url_param)
+
+    if opengraph.valid?
      render json: opengraph
    else
      head :no_content
@@ -14,14 +13,4 @@ class UnfurlLinksController < ApplicationController
    def url_param
      params.require(:url)
    end
-
-    # One deadline for everything the link leads to: DNS lookups, redirects, the page, the image check.
-    def unfurl(url)
-      Timeout.timeout(DEADLINE) do
-        Opengraph::Metadata.from_url(url).then { |opengraph| opengraph if opengraph.valid? }
-      end
-    rescue Timeout::Error
-      Rails.logger.warn "Gave up unfurling #{url} after #{DEADLINE.inspect}"
-      nil
-    end
 end
@@ -1,6 +1,8 @@
 class Users::AvatarsController < ApplicationController
  include ActiveStorage::Streaming

+  content_security_policy false, only: :show
+
  rescue_from(ActiveSupport::MessageVerifier::InvalidSignature) { head :not_found }

  def show
@@ -6,17 +6,12 @@ class Users::PushSubscriptionsController < ApplicationController

  def create
    if subscription = @push_subscriptions.find_by(push_subscription_params)
-      # Existing endpoints must pass current validations
-      if subscription.valid?
-        subscription.touch
-        head :ok
-      else
-        head :unprocessable_entity
-      end
+      subscription.touch
    else
-      subscription = @push_subscriptions.create push_subscription_params.merge(user_agent: request.user_agent)
-      head subscription.persisted? ? :ok : :unprocessable_entity
+      @push_subscriptions.create! push_subscription_params.merge(user_agent: request.user_agent)
    end
+
+    head :ok
  end

  def destroy
@@ -1,16 +1,19 @@
 class Users::SidebarsController < ApplicationController
  DIRECT_PLACEHOLDERS = 20
-  around_action :cache_read_response, only: :show

  def show
-    visible_memberships = Current.user.memberships.visible
-    @direct_memberships = visible_memberships.with_direct_rooms
-    @other_memberships  = visible_memberships.with_ordered_room.without_direct_rooms
+    all_memberships     = Current.user.memberships.visible.with_ordered_room
+    @direct_memberships = extract_direct_memberships(all_memberships)
+    @other_memberships  = all_memberships.without(@direct_memberships)

    @direct_placeholder_users = find_direct_placeholder_users
  end

  private
+    def extract_direct_memberships(all_memberships)
+      all_memberships.select { |m| m.room.direct? }.sort_by { |m| m.room.updated_at }.reverse
+    end
+
    def find_direct_placeholder_users
      exclude_user_ids = user_ids_already_in_direct_rooms_with_current_user.including(Current.user.id)
      User.active.where.not(id: exclude_user_ids).order(:created_at).limit([ DIRECT_PLACEHOLDERS - exclude_user_ids.count, 0 ].max)
@@ -36,11 +36,6 @@ module ApplicationHelper
  end

  private
-    # Header-only forgery protection needs no secret in forms or cached HTML.
-    def token_tag(*)
-      ""
-    end
-
    def admin_body_class
      "admin" if Current.user&.can_administer?
    end
@@ -1,13 +1,3 @@
 module ContentFilters
-  # Formatting the rich text editor produces that Rails' sanitizers don't
-  # allow by default. A message passes through three sanitization layers on
-  # its way to the screen, and each builds on this list:
-  #
-  #   * SanitizeTags strips disallowed markup from the message body
-  #   * Action Text sanitizes the rendered content (lib/rails_ext/action_text_allowed_tags.rb)
-  #   * auto_link re-sanitizes the final html (MessagesHelper#message_presentation)
-  EDITOR_FORMATTING_TAGS = %w[ s u mark table thead tbody tfoot tr th td ]
-  EDITOR_FORMATTING_ATTRIBUTES = %w[ data-language ]
-
-  TextMessagePresentationFilters = ActionText::Content::Filters.new(RemoveSoloUnfurledLinkText, SanitizeTags, SanitizeAttributes)
+  TextMessagePresentationFilters = ActionText::Content::Filters.new(RemoveSoloUnfurledLinkText, StyleUnfurledTwitterAvatars, SanitizeTags)
 end
@@ -1,22 +1,18 @@
 class ContentFilters::RemoveSoloUnfurledLinkText < ActionText::Content::Filter
-  TWITTER_DOMAINS = %w[ x.com twitter.com ]
-  TWITTER_DOMAIN_MAPPING = { "x.com" => "twitter.com" }
-
  def applicable?
    normalize_tweet_url(solo_unfurled_url) == normalize_tweet_url(content.to_plain_text)
  end

  def apply
-    if trix_body?
-      remove_link_text_from_wrapping_div
-    else
-      remove_link_paragraphs
-    end
+    fragment.replace("div") { |node| node.tap { |n| n.inner_html = unfurled_links.first.to_s } }
  end

  private
+    TWITTER_DOMAINS = %w[ x.com twitter.com ]
+    TWITTER_DOMAIN_MAPPING = { "x.com" => "twitter.com" }
+
    def solo_unfurled_url
-      ActionText::Attachment::OpengraphEmbed.from_node(unfurled_links.first)&.href if unfurled_links.size == 1
+      unfurled_links.first["href"] if unfurled_links.size == 1
    end

    def unfurled_links
@@ -39,20 +35,4 @@ class ContentFilters::RemoveSoloUnfurledLinkText < ActionText::Content::Filter
    def twitter_url?(url)
      url.present? && TWITTER_DOMAINS.any? { |domain| url.strip.include?(domain) }
    end
-
-    def trix_body?
-      fragment.find_all("div").any?
-    end
-
-    def remove_link_text_from_wrapping_div
-      fragment.replace("div") { |node| node.tap { |n| n.inner_html = unfurled_links.first.to_s } }
-    end
-
-    def remove_link_paragraphs
-      fragment.replace("p") do |node|
-        if node.at_css("action-text-attachment")
-          node
-        end
-      end
-    end
 end
@@ -1,47 +0,0 @@
-class ContentFilters::SanitizeAttributes < ActionText::Content::Filter
-  def applicable?
-    true
-  end
-
-  # Scrub attributes on the tags that SanitizeTags allows, using Rails' safe-list
-  # sanitizer so unsafe URI schemes and event-handler attributes are stripped.
-  # Runs after SanitizeTags, so passing the same allowed tags makes the tag pass
-  # a no-op and only attributes are scrubbed.
-  def apply
-    sanitizer.sanitize fragment.to_html, tags: allowed_tags, attributes: allowed_attributes
-  end
-
-  private
-    # Presentation styling relies on class attributes (e.g. unfurled link embeds),
-    # which the standard ActionText set doesn't include.
-    EXTRA_ALLOWED_ATTRIBUTES = %w[ class ]
-
-    # ActionText::ContentHelper.sanitizer is a single process-wide instance, and
-    # rails-html-sanitizer reuses one mutable permit scrubber that it reconfigures
-    # from the tags/attributes on every #sanitize call. Sharing it here would race
-    # our stricter tag set against ActionText's default rendering on concurrent
-    # requests, so use a dedicated instance of the same sanitizer class to keep the
-    # scrubber isolated.
-    def sanitizer
-      sanitizer_class.new
-    end
-
-    def sanitizer_class
-      ActionText::ContentHelper.sanitizer.class
-    end
-
-    def allowed_tags
-      ContentFilters::SanitizeTags::ALLOWED_TAGS
-    end
-
-    def allowed_attributes
-      standard_allowed_attributes + EXTRA_ALLOWED_ATTRIBUTES
-    end
-
-    # Mirrors ActionText::ContentHelper#sanitizer_allowed_attributes, which isn't
-    # exposed at the module level.
-    def standard_allowed_attributes
-      ActionText::ContentHelper.allowed_attributes ||
-        (sanitizer_class.allowed_attributes + ActionText::Attachment::ATTRIBUTES).to_a
-    end
-end
@@ -1,8 +1,4 @@
 class ContentFilters::SanitizeTags < ActionText::Content::Filter
-  ALLOWED_TAGS = %w[ a abbr acronym address b big blockquote br cite code dd del dfn div dl dt em h1 h2 h3 h4 h5 h6 hr i ins kbd li ol
-    p pre samp small span strong sub sup time tt ul var ] + ContentFilters::EDITOR_FORMATTING_TAGS +
-    [ ActionText::Attachment.tag_name, "figure", "figcaption" ]
-
  def applicable?
    true
  end
@@ -12,6 +8,9 @@ class ContentFilters::SanitizeTags < ActionText::Content::Filter
  end

  private
+    ALLOWED_TAGS = %w[ a abbr acronym address b big blockquote br cite code dd del dfn div dl dt em h1 h2 h3 h4 h5 h6 hr i ins kbd li ol
+      p pre samp small span strong sub sup time tt ul var ] + [ ActionText::Attachment.tag_name, "figure", "figcaption" ]
+
    def not_allowed_tags_css_selector
      ALLOWED_TAGS.map { |tag| ":not(#{tag})" }.join("")
    end
@@ -0,0 +1,24 @@
+class ContentFilters::StyleUnfurledTwitterAvatars < ActionText::Content::Filter
+  def applicable?
+    unfurled_twitter_avatars.present?
+  end
+
+  def apply
+    fragment.update do |source|
+      div = source.at_css("div")
+      div["class"] = UNFURLED_TWITTER_AVATAR_CSS_CLASS
+    end
+  end
+
+  private
+    UNFURLED_TWITTER_AVATAR_CSS_CLASS = "cf-twitter-avatar"
+    TWITTER_AVATAR_URL_PREFIX = "https://pbs.twimg.com/profile_images"
+
+    def unfurled_twitter_avatars
+      fragment.find_all("#{opengraph_css_selector}[url*='#{TWITTER_AVATAR_URL_PREFIX}']")
+    end
+
+    def opengraph_css_selector
+      "action-text-attachment[@content-type='#{ActionText::Attachment::OpengraphEmbed::OPENGRAPH_EMBED_CONTENT_TYPE}']"
+    end
+end
@@ -17,16 +17,11 @@ class Messages::AttachmentPresentation
    attr_reader :message, :context
    delegate :tag, :link_to, :broadcast_image_tag, :rails_blob_path, :url_for, to: :context

-    # Previews are made when the message is posted, within limits. One that wasn't, because the file was too large or
-    # the preview failed, isn't attempted again from here: its URL would make it on every view.
    def render_preview
-      case
-      when message.attachment.video?
+      if message.attachment.video?
        video_preview_tag
-      when message.attachment.representation(:thumb).processed?
-        lightboxed_image_preview_tag
      else
-        render_link
+        lightboxed_image_preview_tag
      end
    end

@@ -35,17 +30,11 @@ class Messages::AttachmentPresentation

      inline_media_dimension_constraints(width, height) do
        tag.video \
-          src: rails_blob_path(message.attachment), poster: video_poster_url,
+          src: rails_blob_path(message.attachment), poster: url_for(message.attachment.preview(format: :webp, resize_to_limit: [ Message::THUMBNAIL_MAX_WIDTH, Message::THUMBNAIL_MAX_HEIGHT ])),
          controls: true, preload: :none, width: "100%", height: "100%", class: "message__attachment"
      end
    end

-    # A preview is processed once the frame is drawn, but the poster is a variant of that frame, which can fail on its own.
-    def video_poster_url
-      poster = message.attachment.preview(:poster)
-      url_for(poster) if poster.processed? && poster.image.variant(poster.variation).processed?
-    end
-
    def lightboxed_image_preview_tag
      width, height = preview_dimensions

@@ -1,9 +1,4 @@
 module MessagesHelper
-  # auto_link re-sanitizes with Rails' default safe list, which lacks the
-  # formatting the rich text editor produces
-  AUTO_LINK_ALLOWED_TAGS = Rails::HTML5::SafeListSanitizer.allowed_tags + ContentFilters::EDITOR_FORMATTING_TAGS
-  AUTO_LINK_ALLOWED_ATTRIBUTES = Rails::HTML5::SafeListSanitizer.allowed_attributes + ContentFilters::EDITOR_FORMATTING_ATTRIBUTES
-
  def message_area_tag(room, &)
    tag.div id: "message-area", class: "message-area", contents: true, data: {
      controller: "messages presence drop-target",
@@ -36,7 +31,6 @@ module MessagesHelper
        controller: "reply",
        user_id: message.creator_id,
        message_id: message.id,
-        client_message_id: message.client_message_id,
        message_timestamp: message_timestamp_milliseconds,
        message_updated_at: message.updated_at.to_fs(:epoch),
        sort_value: message_timestamp_milliseconds,
@@ -63,7 +57,7 @@ module MessagesHelper
    when "sound"
      message_sound_presentation(message)
    else
-      text_message_presentation(message.body.body)
+      auto_link h(ContentFilters::TextMessagePresentationFilters.apply(message.body.body)), html: { target: "_blank" }
    end
  rescue Exception => e
    Sentry.capture_exception(e, extra: { message: message })
@@ -72,50 +66,7 @@ module MessagesHelper
    ""
  end

-  # These controls contain URLs and static markup, but no viewer or token state.
-  # Keep them across database commits; attachment controls still render afresh.
-  def cache_message_actions(message, &block)
-    return capture(&block) unless controller.perform_caching && !message.attachment?
-
-    key = fragment_name_with_digest([
-      "message-actions-v1", request.base_url, request.script_name, I18n.locale, message.id, message.room_id
-    ], nil)
-    FragmentCache.store.fetch(key) { capture(&block) }
-  end
-
-  def message_fragment_cache_key(message)
-    return message unless controller.perform_caching &&
-      %i[room creator rich_text_body boosts attachment_attachment].all? { |name| message.association(name).loaded? }
-
-    room = message.room
-    body = message.body.body
-    return message if room.direct? || message.attachment? || !body || body.to_html.include?("<action-text-attachment") ||
-      message.boosts.any? { |boost| !boost.association(:booster).loaded? }
-
-    # Collection caching preloads these rows before deriving keys. Read their
-    # actual content: foreign SQL writers need not touch Rails timestamps.
-    dependencies = [ message.attributes, room.attributes.slice("id", "type", "name"), message.creator.attributes,
-      body.to_html, message.boosts.sort_by(&:created_at).map { |boost| [ boost.attributes, boost.booster.attributes ] } ]
-    FragmentCache::ContentKey.new(Digest::SHA256.hexdigest(ActiveSupport::JSON.encode(dependencies)))
-  end
-
  private
-    def text_message_presentation(body)
-      render = -> do
-        auto_link h(ContentFilters::TextMessagePresentationFilters.apply(body)),
-          html: { target: "_blank" }, sanitize_options: { tags: AUTO_LINK_ALLOWED_TAGS, attributes: AUTO_LINK_ALLOWED_ATTRIBUTES }
-      end
-
-      # Embedded attachments render database-backed metadata and signed URLs.
-      # Plain text HTML depends only on its content, even after a foreign edit.
-      html = body.to_html
-      if controller.perform_caching && !html.include?("<action-text-attachment") && html.bytesize <= ResponseCache::MAX_ENTRY_BYTES
-        FragmentCache.store.fetch([ "text-presentation-v1", I18n.locale, Digest::SHA256.hexdigest(html) ]) { render.call }
-      else
-        render.call
-      end
-    end
-
    def messages_actions
      "turbo:before-stream-render@document->messages#beforeStreamRender keydown.up@document->messages#editMyLastMessage"
    end
@@ -1,33 +1,11 @@
 module RichTextHelper
  def rich_text_data_actions
-    # submitByKeyboard runs in the capture phase so it can submit on Enter
-    # before the editor turns the keystroke into a newline
-    "lexxy:change->typing-notifications#start keydown->composer#submitByKeyboard:capture"
-  end
+    default_actions =
+      "trix-change->typing-notifications#start keydown->composer#submitByKeyboard"

-  def mention_prompt_tag(room)
-    tag.lexxy_prompt trigger: "@", name: "mention", src: autocompletable_users_path(room_id: room.id),
-      "remote-filtering": true, "empty-results": "No matches"
-  end
+    autocomplete_actions =
+      "trix-focus->rich-autocomplete#focus trix-change->rich-autocomplete#search trix-blur->rich-autocomplete#blur"

-  # The editor keeps an attachment's content as it finds it, so every
-  # attachment is rebuilt from its attachable before editing: a Trix-era
-  # embed carries its details as node attributes the editor doesn't
-  # round-trip, a mention edited under Trix carries the generic content type
-  # the editor doesn't permit, and a hand-written embed carries whatever
-  # markup the author put there.
-  def editable_body(message)
-    fragment = ActionText::Fragment.wrap(message.body.body_before_type_cast)
-
-    transformed = fragment.replace(ActionText::Attachment.tag_name) do |node|
-      attachment = ActionText::Attachment.from_node(node)
-
-      node.tap do |n|
-        n["content-type"] = attachment.attachable.attachable_content_type
-        n["content"] = render_action_text_attachment(attachment)
-      end
-    end
-
-    ActionText::RichText.new(body: transformed.to_html)
+    [ default_actions, autocomplete_actions ].join(" ")
  end
 end
@@ -73,12 +73,12 @@ module RoomsHelper
    def composer_data_actions
      drag_and_drop_actions = "drop-target:drop@window->composer#dropFiles"

-      attachment_actions =
-        "lexxy:file-accept->composer#preventAttachment refresh-room:online@window->composer#online"
+      trix_attachment_actions =
+        "trix-file-accept->composer#preventAttachment refresh-room:online@window->composer#online"

      remaining_actions =
        "typing-notifications#stop paste->composer#pasteFiles turbo:submit-end->composer#submitEnd refresh-room:offline@window->composer#offline"

-      [ drop_target_actions, drag_and_drop_actions, attachment_actions, remaining_actions ].join(" ")
+      [ drop_target_actions, drag_and_drop_actions, trix_attachment_actions, remaining_actions ].join(" ")
    end
 end
@@ -1,4 +1,6 @@
 // Configure your import map in config/importmap.rb. Read more: https://github.com/rails/importmap-rails
 import "@hotwired/turbo-rails"
+import "trix"
+import "@rails/actiontext"
 import "initializers"
 import "controllers"
@@ -1,7 +1,7 @@
 import { Controller } from "@hotwired/stimulus"
 import FileUploader from "models/file_uploader"
 import { onNextEventLoopTick, nextFrame } from "helpers/timing_helpers"
-import { escapeHTML } from "helpers/string_helpers"
+import { escapeHTML } from "helpers/dom_helpers"

 export default class extends Controller {
  static classes = ["toolbar"]
@@ -12,21 +12,11 @@ export default class extends Controller {
  #files = []

  connect() {
-    this.#restoreDraft()
-
    if (!this.#usingTouchDevice) {
      onNextEventLoopTick(() => this.textTarget.focus())
    }
  }

-  saveDraft() {
-    if (this.textTarget.isBlank) {
-      localStorage.removeItem(this.#draftKey)
-    } else {
-      localStorage.setItem(this.#draftKey, this.textTarget.value)
-    }
-  }
-
  submit(event) {
    event.preventDefault()

@@ -54,20 +44,21 @@ export default class extends Controller {
  }

  replaceMessageContent(content) {
-    this.textTarget.value = content
-    this.textTarget.focus()
-    this.textTarget.selection.placeCursorAtTheEnd()
+    const editor = this.textTarget.editor
+
+    editor.recordUndoEntry("Format reply")
+    editor.setSelectedRange([0, editor.getDocument().toString().length])
+    editor.deleteInDirection("forward")
+    editor.insertHTML(content)
+    editor.setSelectedRange([editor.getDocument().toString().length - 1])
  }

  submitByKeyboard(event) {
-    if (event.key != "Enter" || this.textTarget.hasOpenPrompt) return
-
    const toolbarVisible = this.element.classList.contains(this.toolbarClass)
-    const metaEnter = event.metaKey || event.ctrlKey
-    const plainEnter = !event.shiftKey && !event.isComposing
+    const metaEnter = event.key == "Enter" && (event.metaKey || event.ctrlKey)
+    const plainEnter = event.keyCode == 13 && !event.shiftKey && !event.isComposing

    if (!this.#usingTouchDevice && (metaEnter || (plainEnter && !toolbarVisible))) {
-      event.stopPropagation()
      this.submit(event)
    }
  }
@@ -117,19 +108,6 @@ export default class extends Controller {
    this.fieldsTarget.disabled = true
  }

-  #restoreDraft() {
-    const draft = localStorage.getItem(this.#draftKey)
-
-    if (draft) {
-      this.textTarget.value = draft
-      this.textTarget.selection.placeCursorAtTheEnd()
-    }
-  }
-
-  get #draftKey() {
-    return `composer-draft-${this.roomIdValue}`
-  }
-
  get #usingTouchDevice() {
    return 'ontouchstart' in window || navigator.maxTouchPoints > 0 || navigator.msMaxTouchPoints > 0;
  }
@@ -148,7 +126,7 @@ export default class extends Controller {
  }

  #validInput() {
-    return !this.textTarget.isBlank
+    return this.textTarget.textContent.trim().length > 0
  }

  async #submitFiles() {
@@ -181,7 +159,6 @@ export default class extends Controller {

  #reset() {
    this.textTarget.value = ""
-    localStorage.removeItem(this.#draftKey)
  }

  #updateFileList() {
@@ -46,7 +46,6 @@ export default class extends Controller {
  }

  messageTargetConnected(target) {
-    this.#reconcilePendingMessage(target)
    this.#formatter.format(target, ThreadStyle.thread)
  }

@@ -90,7 +89,7 @@ export default class extends Controller {
  }

  async editMyLastMessage() {
-    const editorEmpty = document.querySelector("#composer lexxy-editor").isBlank
+    const editorEmpty = document.querySelector("#composer trix-editor").matches(":empty")

    if (editorEmpty && this.#paginator.upToDate) {
      this.#myLastMessage?.querySelector(".message__edit-btn")?.click()
@@ -126,25 +125,6 @@ export default class extends Controller {

  // Internal

-  // The composer inserts a pending message client-side using the client_message_id
-  // as its DOM id. The server broadcast now renders the real message with a DOM id
-  // derived from the record's primary key, so it no longer replaces the pending
-  // element by id. Reconcile by matching the server message's client_message_id and
-  // dropping our own pending placeholder. Only elements flagged data-pending-message
-  // (client-side placeholders, never broadcast) are removed, so a message another
-  // member posted reusing this client_message_id can never displace a real one.
-  #reconcilePendingMessage(target) {
-    const clientMessageId = target.dataset.clientMessageId
-
-    if (target.dataset.messageId && clientMessageId) {
-      const selector = `[data-pending-message][data-client-message-id="${CSS.escape(clientMessageId)}"]`
-
-      this.messagesTarget.querySelectorAll(selector).forEach((pending) => {
-        if (pending !== target) pending.remove()
-      })
-    }
-  }
-
  async #ensureUpToDate() {
    if (!this.#paginator.upToDate) {
      await this.#paginator.resetToLastPage()
@@ -16,7 +16,7 @@ export default class extends Controller {
    })
  }

-  #read = ({ room_id, at }) => {
-    this.dispatch("read", { detail: { roomId: room_id, at } })
+  #read = ({ room_id }) => {
+    this.dispatch("read", { detail: { roomId: room_id } })
  }
 }
@@ -11,7 +11,7 @@ export default class extends Controller {
  }

  reply() {
-    const content = `<blockquote>${this.#bodyContent}</blockquote><cite>${this.authorTarget.innerHTML} ${this.#linkToOriginal}</cite><p><br></p>`
+    const content = `<blockquote>${this.#bodyContent}</blockquote><cite>${this.authorTarget.innerHTML} ${this.#linkToOriginal}</cite><br>`
    this.composerOutlet.replaceMessageContent(content)
  }

@@ -23,7 +23,7 @@ export default class extends Controller {
  }

  get #bodyContent() {
-    const body = this.bodyTarget.querySelector(".lexxy-content").cloneNode(true)
+    const body = this.bodyTarget.querySelector(".trix-content").cloneNode(true)
    return this.#stripMentionAttachments(this.#stripUnfurledAttachments(body)).innerHTML
  }

@@ -0,0 +1,46 @@
+import { Controller } from "@hotwired/stimulus"
+import MentionsAutocompleteHandler from "lib/autocomplete/mentions_autocomplete_handler"
+import { debounce } from "helpers/timing_helpers"
+
+export default class extends Controller {
+  static values = { url: String }
+
+  initialize() {
+    this.handlers = []
+    this.search = debounce(this.search.bind(this), 300)
+  }
+
+  connect() {
+    if (this.element == document.activeElement) {
+      this.#installHandlers()
+    }
+  }
+
+  focus(event) {
+    this.#installHandlers()
+  }
+
+  search(event) {
+    const content = this.editor.getDocument().toString()
+    const position = this.editor.getPosition()
+    this.handlers.forEach(handler => handler.updateWithContentAndPosition(content, position))
+  }
+
+  blur(event) {
+    this.#uninstallHandlers()
+  }
+
+  #installHandlers() {
+    this.#uninstallHandlers()
+    this.handlers = [ new MentionsAutocompleteHandler(this.element, this.urlValue) ]
+  }
+
+  #uninstallHandlers() {
+    this.handlers.forEach(handler => handler.destroy())
+    this.handlers = []
+  }
+
+  get editor() {
+    return this.element.editor
+  }
+}
@@ -7,13 +7,8 @@ export default class extends Controller {
  static classes = [ "unread" ]

  #disconnected = true
-  #connection = 0
-  #discardDirectEditor = false
-  #readAt = new Map()

  async connect() {
-    this.element.addEventListener("turbo:click", this.#directNavigation)
-    this.element.addEventListener("turbo:before-frame-render", this.#preserveDirectEditor)
    this.channel ??= await cable.subscribeTo({ channel: "UnreadRoomsChannel" }, {
      connected: this.#channelConnected.bind(this),
      disconnected: this.#channelDisconnected.bind(this),
@@ -22,11 +17,7 @@ export default class extends Controller {
  }

  disconnect() {
-    this.element.removeEventListener("turbo:click", this.#directNavigation)
-    this.element.removeEventListener("turbo:before-frame-render", this.#preserveDirectEditor)
-    this.#discardDirectEditor = false
    ignoringBriefDisconnects(this.element, () => {
-      this.#channelDisconnected()
      this.channel?.unsubscribe()
      this.channel = null
    })
@@ -36,58 +27,19 @@ export default class extends Controller {
    this.read({ detail: { roomId: Current.room.id } })
  }

-  read({ detail: { roomId, at } }) {
+  read({ detail: { roomId } }) {
    const room = this.#findRoomTarget(roomId)

-    if (at) {
-      this.#readAt.set(Number(roomId), Math.max(Number(at), this.#readAt.get(Number(roomId)) ?? 0))
-    }
-
    if (room) {
      room.classList.remove(this.unreadClass)
      this.dispatch("read", { detail: { targetId: roomId } })
    }
  }

-  // Preserve the live picker through background refreshes, but allow deliberate navigation.
-  #directNavigation = event => {
-    if (event.target.closest("a")?.dataset.turboFrame === this.element.id) {
-      this.#discardDirectEditor = true
-    }
-  }
-
-  #preserveDirectEditor = event => {
-    if (event.target !== this.element) return
-    const discard = this.#discardDirectEditor
-    this.#discardDirectEditor = false
-    if (discard) return
-
-    const current = this.element.querySelector("#direct_rooms_control")
-    const incoming = event.detail.newFrame.querySelector("#direct_rooms_control")
-    if (!current?.querySelector('[data-autocomplete-target="input"]') || !incoming) return
-
-    // Turbo's Bardo moves the actual element, keeping input, selections and controllers.
-    const controls = [ current, incoming ].map(element => [ element, element.hasAttribute("data-turbo-permanent") ])
-    for (const [ element ] of controls) element.setAttribute("data-turbo-permanent", "")
-    const render = event.detail.render
-    event.detail.render = (...args) => {
-      try {
-        return render(...args)
-      } finally {
-        for (const [ element, permanent ] of controls) element.toggleAttribute("data-turbo-permanent", permanent)
-      }
-    }
-  }
-
-  async #channelConnected() {
+  #channelConnected() {
    if (this.#disconnected) {
      this.#disconnected = false
-      const connection = ++this.#connection
-      // Reloading an unfinished frame aborts its response body reader.
-      await this.element.loaded
-      if (this.element.isConnected && !this.#disconnected && connection === this.#connection) {
-        this.element.reload()
-      }
+      this.element.reload()
    }
  }

@@ -95,11 +47,11 @@ export default class extends Controller {
    this.#disconnected = true
  }

-  #unread({ roomId, at }) {
+  #unread({ roomId }) {
    const unreadRoom = this.#findRoomTarget(roomId)

    if (unreadRoom) {
-      if (Current.room.id != roomId && !this.#readSince(roomId, at)) {
+      if (Current.room.id != roomId) {
        unreadRoom.classList.add(this.unreadClass)
      }

@@ -107,12 +59,6 @@ export default class extends Controller {
    }
  }

-  // Notices fan out one member at a time, so one can arrive after the member has already
-  // read the room in another tab. It still reorders the room, but doesn't mark it unread.
-  #readSince(roomId, at) {
-    return Number(at) <= this.#readAt.get(Number(roomId))
-  }
-
  #findRoomTarget(roomId) {
    return this.roomTargets.find(roomTarget => roomTarget.dataset.roomId == roomId)
  }
@@ -1,84 +0,0 @@
-import { Controller } from "@hotwired/stimulus"
-import { post } from "@rails/request.js"
-import { escapeHTML, truncateString } from "helpers/string_helpers"
-
-const OPENGRAPH_EMBED_CONTENT_TYPE = "application/vnd.actiontext.opengraph-embed"
-
-const UNFURLED_TWITTER_AVATAR_CSS_CLASS = "og-embed--twitter-avatar"
-const TWITTER_AVATAR_URL_PREFIX = "https://pbs.twimg.com/profile_images"
-
-export default class extends Controller {
-  #abortController
-
-  disconnect() {
-    this.#abortController?.abort()
-  }
-
-  async unfurl(event) {
-    if (!this.element.permitsAttachmentContentType(OPENGRAPH_EMBED_CONTENT_TYPE)) return
-
-    const { url, insertBelowLink } = event.detail
-
-    const metadata = await this.#fetchOpengraphMetadata(url)
-
-    if (metadata) {
-      insertBelowLink(this.#opengraphEmbedHTML(metadata), { attachment: { contentType: OPENGRAPH_EMBED_CONTENT_TYPE } })
-    }
-  }
-
-  async #fetchOpengraphMetadata(url) {
-    this.#abortController?.abort()
-    this.#abortController = new AbortController()
-
-    try {
-      const response = await post("/unfurl_link", {
-        body: { url },
-        contentType: "application/json",
-        signal: this.#abortController.signal
-      })
-
-      if (response.ok && response.statusCode !== 204) {
-        const { title, url: href, image, description } = await response.json
-        if (title && href) return { title, href, image, description }
-      }
-    } catch {
-      // Ignore aborted and failed requests
-    }
-
-    return null
-  }
-
-  #opengraphEmbedHTML({ title, href, image, description }) {
-    return `<actiontext-opengraph-embed>
-      <div class="og-embed gap ${this.#embedClass(image)}">
-        <div class="og-embed__content">
-          <div class="og-embed__title">
-            <a href="${escapeHTML(href)}" rel="noreferrer" target="_blank">${escapeHTML(truncateString(title, 280))}</a>
-          </div>
-          <div class="og-embed__description">${escapeHTML(truncateString(description, 560))}</div>
-        </div>
-        ${this.#imageHTML(image)}
-      </div>
-    </actiontext-opengraph-embed>`
-  }
-
-  #embedClass(image) {
-    if (this.#isTwitterAvatar(image)) {
-      return UNFURLED_TWITTER_AVATAR_CSS_CLASS
-    } else {
-      return ""
-    }
-  }
-
-  #isTwitterAvatar(image) {
-    return Boolean(image) && image.startsWith(TWITTER_AVATAR_URL_PREFIX)
-  }
-
-  #imageHTML(image) {
-    if (image) {
-      return `<div class="og-embed__image"><img src="${escapeHTML(image)}" class="image center" alt="" /></div>`
-    } else {
-      return ""
-    }
-  }
-}
@@ -4,6 +4,12 @@ export function scrollToBottom(container) {
  container.scrollTop = container.scrollHeight
 }

+export function escapeHTML(html) {
+  const div = document.createElement("div")
+  div.textContent = html
+  return div.innerHTML
+}
+
 export function parseHTMLFragment(html) {
  const template = document.createElement("template")
  template.innerHTML = html
@@ -1,5 +1,3 @@
-const HTML_ESCAPES = { "&": "&amp;", "<": "&lt;", ">": "&gt;", "\"": "&quot;", "'": "&#39;" }
-
 export function truncateString(string, length, omission = "…") {
  if (string.length <= length) {
    return string
@@ -7,7 +5,3 @@ export function truncateString(string, length, omission = "…") {
    return string.slice(0, length - omission.length) + omission
  }
 }
-
-export function escapeHTML(string) {
-  return String(string ?? "").replace(/[&<>"']/g, character => HTML_ESCAPES[character])
-}
@@ -1,19 +1,10 @@
-import * as Lexxy from "lexxy"
-import CampfireRichTextExtension from "lib/rich_text/campfire_extension"
+import Unfurler from "lib/rich_text/unfurl/unfurler"

-Lexxy.configure({
-  global: {
-    // Keep the content type of mention attachments (application/vnd.campfire.mention)
-    // that Campfire has used since its Trix days
-    attachmentContentTypeNamespace: "campfire",
-    extensions: [ CampfireRichTextExtension ]
-  },
-  default: {
-    // Campfire sends files as separate messages via the composer's own
-    // attach button, never through the editor
-    toolbar: { attachments: false },
+// Support a `cite` block for attribution links
+Trix.config.blockAttributes.cite = {
+  tagName: "cite",
+  inheritable: false,
+}

-    // Trix offered a single heading level, rendered as h1
-    headings: [ "h1" ]
-  }
-})
+const unfurler = new Unfurler()
+unfurler.install()
@@ -120,7 +120,7 @@ export default class BaseAutocompleteHandler {

  #fetchAutocompletables(url) {
    if (url) {
-      return fetch(url, { headers: { Accept: "application/json" } }).then(response => response.json())
+      return fetch(url, { as: "json" }).then(response => response.json())
    } else {
      return Promise.resolve()
    }
@@ -0,0 +1,48 @@
+import BaseAutocompleteHandler from "lib/autocomplete/base_autocomplete_handler"
+import { PUNCTUATION_PATTERN } from "lib/autocomplete/constants"
+
+export default class extends BaseAutocompleteHandler {
+  get pattern() {
+    return new RegExp(`^@(.*?)(${PUNCTUATION_PATTERN.source}*)$`)
+  }
+
+  insertAutocompletable(autocompletable, range, terminator, options = {}) {
+    const attachment = this.#createAttachmentForAutocompletable(autocompletable)
+    this.#insertAttachmentAndTerminatorIntoEditorAtRange(attachment, terminator, range, options)
+  }
+
+  // Override to set selector's position relative to the cursor in the editor
+  getOffsetsAtPosition(position) {
+    return this.#getOffsetsFromEditorAtPosition(this.#editor, position)
+  }
+
+  #createAttachmentForAutocompletable(mentionable) {
+    const mention = `
+      <span class="mention" sgid=${mentionable.sgid}>
+        <img src="${mentionable.avatar_url}" class="avatar" alt="${mentionable.name}">
+        ${mentionable.name}
+      </span>
+    `
+
+    return new Trix.Attachment({
+      content: mention,
+      contentType: "application/vnd.campfire.mention",
+      sgid: mentionable.sgid
+    })
+  }
+
+  #insertAttachmentAndTerminatorIntoEditorAtRange(attachment, terminator, range) {
+    if (range) { this.#editor.setSelectedRange(range) }
+    this.#editor.insertAttachment(attachment)
+    this.#editor.insertString(terminator)
+  }
+
+  get #editor() {
+    return this.element.editor
+  }
+
+  #getOffsetsFromEditorAtPosition(editor, position) {
+    const rect = this.#editor.getClientRectAtPosition(position)
+    return rect ? rect : {}
+  }
+}
@@ -1,24 +0,0 @@
-import * as Lexxy from "lexxy"
-import CiteNode from "lib/rich_text/cite_node"
-
-export default class CampfireRichTextExtension extends Lexxy.Extension {
-  get allowedElements() {
-    return [
-      "cite",
-      "figure",
-      "figcaption",
-      "actiontext-opengraph-embed",
-      { tag: "div", attributes: [ "sgid" ] },
-      { tag: "span", attributes: [ "sgid" ] },
-      { tag: "img", attributes: [ "alt" ] },
-      { tag: "a", attributes: [ "rel", "target" ] }
-    ]
-  }
-
-  get lexicalExtension() {
-    return this.defineExtension({
-      name: "campfire/rich-text",
-      nodes: [ CiteNode ]
-    })
-  }
-}
@@ -1,39 +0,0 @@
-import * as Lexxy from "lexxy"
-
-const { ElementNode } = Lexxy.Lexical
-
-export default class CiteNode extends ElementNode {
-  static getType() {
-    return "cite"
-  }
-
-  static clone(node) {
-    return new CiteNode(node.__key)
-  }
-
-  static importJSON(serializedNode) {
-    return new CiteNode().updateFromJSON(serializedNode)
-  }
-
-  static importDOM() {
-    return {
-      cite: () => ({ conversion: () => ({ node: new CiteNode() }), priority: 1 })
-    }
-  }
-
-  exportJSON() {
-    return { ...super.exportJSON(), type: "cite" }
-  }
-
-  createDOM() {
-    return document.createElement("cite")
-  }
-
-  updateDOM() {
-    return false
-  }
-
-  exportDOM() {
-    return { element: document.createElement("cite") }
-  }
-}
@@ -0,0 +1,80 @@
+import { post } from "@rails/request.js"
+import { truncateString } from "helpers/string_helpers"
+
+const UNFURLED_TWITTER_AVATAR_CSS_CLASS = "cf-twitter-avatar"
+const TWITTER_AVATAR_URL_PREFIX = "https://pbs.twimg.com/profile_images"
+
+export default class OpengraphEmbedOperation {
+  constructor(paste) {
+    this.paste = paste
+    this.editor = this.paste.editor
+    this.url = this.paste.string
+
+    this.abortController = new AbortController()
+  }
+
+  perform() {
+    return this.#createOpenGraphMetadataRequest()
+      .then(response => response.json)
+      .then(this.#insertOpengraphAttachment.bind(this))
+      .catch(() => null)
+  }
+
+  abort() {
+    this.abortController.abort()
+  }
+
+  #createOpenGraphMetadataRequest() {
+    return post("/unfurl_link", {
+      body: { url: this.url },
+      contentType: "application/json",
+      signal: this.abortController.signal
+    })
+  }
+
+  #insertOpengraphAttachment(response) {
+    if (this.#shouldInsertOpengraphPreview) {
+      const currentRange = this.editor.getSelectedRange()
+      this.editor.setSelectedRange(this.editor.getSelectedRange())
+      this.editor.recordUndoEntry("Insert Opengraph preview for Pasted URL")
+      this.editor.insertAttachment(this.#createOpengraphAttachment(response))
+      this.editor.setSelectedRange(currentRange)
+    }
+  }
+
+  get #shouldInsertOpengraphPreview() {
+    return this.editor.getDocument().toString().includes(this.url)
+  }
+
+  #createOpengraphAttachment(response) {
+    const { title, url, image, description } = response
+    const html = this.#generateOpengraphEmbedHTML({ title, url, image, description })
+
+    return new Trix.Attachment({
+      contentType: "application/vnd.actiontext.opengraph-embed",
+      content: html,
+      filename: title,
+      href: url,
+      url: image,
+      caption: description
+    })
+  }
+
+  #generateOpengraphEmbedHTML(embed) {
+    return `<actiontext-opengraph-embed class="${this.#isTwitterAvatar(embed) ? UNFURLED_TWITTER_AVATAR_CSS_CLASS : ''}">
+      <div class="og-embed">
+        <div class="og-embed__content">
+          <div class="og-embed__title">${truncateString(embed.title, 560)}</div>
+          <div class="og-embed__description">${truncateString(embed.description, 560)}</div>
+        </div>
+        <div class="og-embed__image">
+          <img src="${embed.image}" class="image" alt="" />
+        </div>
+      </div>
+    </actiontext-opengraph-embed>`
+  }
+
+  #isTwitterAvatar(embed) {
+    return embed.image.startsWith(TWITTER_AVATAR_URL_PREFIX)
+  }
+}
@@ -0,0 +1,39 @@
+export default class Paste {
+  constructor(range, editor, document) {
+    this.range = range
+    this.editor = editor
+    this.document = document
+    if (this.document == null) { this.document = this.editor.getDocument() }
+    this.string = this.document.getStringAtRange(this.range)
+  }
+
+  isURL() {
+    return /^(?:[a-z0-9]+:\/\/|www\.)[^\s]+$/.test(this.string)
+  }
+
+  getPathname() {
+    const a = document.createElement("a")
+    a.href = this.string
+    return a.pathname
+  }
+
+  isLinked() {
+    const {href} = this.getCommonAttributes()
+    return (href != null) && (href !== this.string)
+  }
+
+  getCommonAttributes() {
+    return this.document.getCommonAttributesAtRange(this.range)
+  }
+
+  getSignificantPaste() {
+    return new this.constructor(this.getSignificantRange(), this.editor, this.document)
+  }
+
+  getSignificantRange() {
+    const significantString = this.string.trim()
+    const startOffset = this.range[0] + this.string.indexOf(significantString)
+    const endOffset = startOffset + significantString.length
+    return [startOffset, endOffset]
+  }
+}
@@ -0,0 +1,59 @@
+import OpengraphEmbedOperation from "lib/rich_text/unfurl/lib/opengraph_embed_operation"
+import Paste from "lib/rich_text/unfurl/lib/paste"
+
+const performOperation = (function() {
+  let operation = null
+  let requestId = null
+
+  return function(operationToPerform) {
+    operation?.abort()
+    cancelAnimationFrame(requestId)
+
+    requestId = requestAnimationFrame(function() {
+      operation = operationToPerform
+      operation.perform().then(() => operation = null)
+    })
+  }
+})()
+
+export default class Unfurler {
+  install() {
+    this.#addEventListeners()
+  }
+
+  #addEventListeners() {
+    addEventListener("trix-initialize", function(event) {
+      if (this.#editorElementPermitsAttribute(event.target, "href")) {
+        return event.target.addEventListener("trix-paste", this.#didPaste.bind(this))
+      }
+    }.bind(this))
+  }
+
+  #didPaste(event) {
+    const {range} = event.paste
+    const {editor} = event.target
+
+    if (range != null) {
+      const paste = new Paste(range, editor).getSignificantPaste()
+
+      if (paste.isURL()) {
+        if (this.#editorElementPermitsOpengraphAttachment(event.target)) {
+          performOperation(new OpengraphEmbedOperation(paste))
+        }
+      }
+    }
+  }
+
+  #editorElementPermitsAttribute(element, attributeName) {
+    if (element.hasAttribute("data-permitted-attributes")) {
+      return Array.from(element.getAttribute("data-permitted-attributes").split(" ")).includes(attributeName)
+    } else {
+      return true
+    }
+  }
+
+  #editorElementPermitsOpengraphAttachment(element) {
+    const permittedAttachmentTypes = element.getAttribute("data-permitted-attachment-types")
+    return permittedAttachmentTypes && permittedAttachmentTypes.includes("application/vnd.actiontext.opengraph-embed")
+  }
+}
@@ -18,7 +18,7 @@ export default class ClientMessage {
      body,
      messageTimestamp: Math.floor(now.getTime()),
      messageDatetime: now.toISOString(),
-      messageClasses: this.#messageClassesFromNode(node),
+      messageClasses: this.#containsOnlyEmoji(node.textContent) ? "message--emoji" : "",
    })
  }

@@ -52,37 +52,26 @@ export default class ClientMessage {
    }
  }

-  #messageClassesFromNode(node) {
-    if (this.#containsOnlyEmoji(this.#plainTextFromNode(node))) {
-      return "message--emoji"
-    } else {
-      return ""
-    }
-  }
-

  #isPlayCommand(node) {
    return this.#matchPlayCommand(node)
  }

  #matchPlayCommand(node) {
-    return this.#plainTextFromNode(node)?.match(new RegExp(`^/play (${SOUND_NAMES.join("|")})`))?.[1]
+    return this.#stripWrapperElement(node)?.match(new RegExp(`^/play (${SOUND_NAMES.join("|")})`))?.[1]
  }

-  #plainTextFromNode(node) {
-    if (this.#isRichText(node)) {
-      return node.toString().trim()
-    } else {
-      return node
-    }
+  #stripWrapperElement(node) {
+    return node.innerHTML?.replace(/<div>(?:<!--[\s\S]*?-->)*([\s\S]*?)<\/div>/i, '$1')
  }

+
  #isRichText(node) {
    return typeof(node) != "string"
  }

  #richTextContent(node) {
-    return `<div class="lexxy-content">${node.value}</div>`
+    return `<div class="trix-content">${node.innerHTML}</div>`
  }


@@ -13,6 +13,7 @@ export default class FileUploader {

    const req = new XMLHttpRequest()
    req.open("POST", this.url)
+    req.setRequestHeader("X-CSRF-Token", document.querySelector("meta[name=csrf-token]").content)
    req.upload.addEventListener("progress", this.#uploadProgress.bind(this))

    const result = new Promise((resolve, reject) => {
@@ -76,21 +76,7 @@ export default class MessageFormatter {
  }

  #highlightCodeBlock(block) {
-    this.#normalizeLineBreaks(block)
-
-    if (this.#isPlainText(block)) {
-      const language = block.dataset.language
-      if (language && window.hljs.getLanguage(language)) {
-        block.classList.add(`language-${language}`)
-      }
-
-      window.hljs.highlightElement(block)
-    }
-  }
-
-  // Lexxy breaks code block lines with <br>, Trix-era blocks used newlines
-  #normalizeLineBreaks(block) {
-    block.querySelectorAll("br").forEach(br => br.replaceWith("\n"))
+    if (this.#isPlainText(block)) window.hljs.highlightElement(block)
  }

  #isPlainText(element) {
@@ -1,5 +0,0 @@
-class Message::BroadcastUnreadRoomJob < ApplicationJob
-  def perform(message)
-    message.broadcast_unread_room
-  end
-end
@@ -1,8 +0,0 @@
-class Room::DestroyJob < ApplicationJob
-  discard_on ActiveJob::DeserializationError
-
-  def perform(room, former_member_ids)
-    room.reset_remote_connections_of(former_member_ids)
-    room.destroy_one_message_at_a_time
-  end
-end
@@ -1,20 +0,0 @@
-# Native view caches share one byte budget across every database generation.
-class FragmentCache
-  # Only callers that fingerprint every rendered dependency may omit the epoch.
-  ContentKey = Data.define(:digest) do
-    def cache_key
-      digest
-    end
-  end
-
-  STORE = ActiveSupport::Cache::MemoryStore.new(size: 64.megabytes)
-  private_constant :STORE
-
-  def self.store
-    STORE
-  end
-
-  def self.transaction_open?
-    ActiveRecord::Base.connection_pool.with_connection(&:transaction_open?)
-  end
-end
@@ -9,8 +9,7 @@ class Membership < ApplicationRecord
  enum :involvement, %w[ invisible nothing mentions everything ].index_by(&:itself), prefix: :involved_in

  scope :with_ordered_room, -> { includes(:room).joins(:room).order("LOWER(rooms.name)") }
-  scope :with_direct_rooms, -> { includes(:room).joins(:room).merge(Room.directs).order(rooms: { updated_at: :desc }) }
-  scope :without_direct_rooms, -> { joins(:room).merge(Room.without_directs) }
+  scope :without_direct_rooms, -> { joins(:room).where.not(room: { type: "Rooms::Direct" }) }

  scope :visible, -> { where.not(involvement: :invisible) }
  scope :unread,  -> { where.not(unread_at: nil) }
@@ -9,29 +9,23 @@ class Message < ApplicationRecord
  has_rich_text :body

  before_create -> { self.client_message_id ||= Random.uuid } # Bots don't care
-  # Run after Action Text and Active Storage autosave, while creation is still atomic.
-  after_save :record_creation, if: :previously_new_record?
-  after_create_commit -> { room.push_later(self) }
+  after_create_commit -> { room.receive(self) }

  scope :ordered, -> { order(:created_at) }
  scope :with_creator, -> { preload(creator: :avatar_attachment) }
  scope :with_attachment_details, -> {
-    with_rich_text_body_and_embeds.with_attached_attachment
+    with_rich_text_body_and_embeds
+    with_attached_attachment
      .includes(attachment_blob: :variant_records)
  }
-  scope :with_boosts, -> { includes(boosts: { booster: :avatar_attachment }) }
-  scope :with_presentation, -> { with_creator.with_attachment_details.with_boosts.preload(:room) }
+  scope :with_boosts, -> { includes(boosts: :booster) }

  def plain_text_body
-    content = body.body
-    text = if content && content.fragment.find_all(ActionText::Attachment.tag_name).empty?
-      # ActionText::Content#to_plain_text duplicates the fragment to replace
-      # attachments. Without them, reuse its native Fragment conversion instead.
-      content.fragment.to_plain_text.dup
-    else
-      body.to_plain_text
-    end
-    text.presence || attachment&.filename&.to_s || ""
+    body.to_plain_text.presence || attachment&.filename&.to_s || ""
+  end
+
+  def to_key
+    [ client_message_id ]
  end

  def content_type
@@ -47,10 +41,4 @@ class Message < ApplicationRecord
      Sound.find_by_name match[:name]
    end
  end
-
-  private
-    def record_creation
-      create_in_index
-      room.unread_memberships(self)
-    end
 end
@@ -4,14 +4,9 @@ module Message::Attachment
  THUMBNAIL_MAX_WIDTH = 1200
  THUMBNAIL_MAX_HEIGHT = 800

-  # Decoding a picture, or a video's frame, costs in proportion to its pixels, however small the file. The largest
-  # phone photos have 200 million.
-  THUMBNAIL_MAX_PIXELS = 250_000_000
-
  included do
    has_one_attached :attachment do |attachable|
      attachable.variant :thumb, resize_to_limit: [ THUMBNAIL_MAX_WIDTH, THUMBNAIL_MAX_HEIGHT ]
-      attachable.variant :poster, format: :webp, resize_to_limit: [ THUMBNAIL_MAX_WIDTH, THUMBNAIL_MAX_HEIGHT ]
    end
  end

@@ -35,25 +30,12 @@ module Message::Attachment
      attachment&.analyze
    end

-    # A file that ffmpeg or libvips can't decode is still the message: post it without a preview.
    def process_attachment_thumbnail
-      return if too_many_pixels_to_preview?
-
      case
      when attachment.video?
-        attachment.preview(:poster).processed
+        attachment.preview(format: :webp).processed
      when attachment.representable?
        attachment.representation(:thumb).processed
      end
-    rescue ActiveStorage::PreviewError, Vips::Error => error
-      Rails.logger.warn "Posted #{attachment.filename} without a preview: #{error.class}: #{error.message.lines.first&.chomp}"
-    end
-
-    # Without a size, the analyzer couldn't read the file's header, and the previewer wouldn't either.
-    def too_many_pixels_to_preview?
-      if attachment.image? || attachment.video?
-        width, height = attachment.metadata.values_at(:width, :height)
-        width.nil? || height.nil? || width * height > THUMBNAIL_MAX_PIXELS
-      end
    end
 end
@@ -1,29 +1,19 @@
 module Message::Broadcasts
-  def broadcast_create(html: nil)
-    broadcast_append_to room, :messages, target: [ room, :messages ], **(html ? { html: html } : {})
-    broadcast_unread_room_later
+  def broadcast_create
+    broadcast_append_to room, :messages, target: [ room, :messages ]
+    broadcast_unread_room
  end

  def broadcast_remove
    broadcast_remove_to room, :messages
  end

-  # Fanned out to the room's members rather than published on one global stream, so
-  # that the timing of activity in a room only reaches people who are in it. Of those,
-  # only the ones who still have it unread or are in it now: by the time this runs,
-  # someone may have opened the room and moved on, and would see it marked unread again.
-  def broadcast_unread_room
-    payload = ActiveSupport::JSON.encode(roomId: room.id, at: created_at.to_f)
-
-    room.memberships.unread.or(room.memberships.connected).pluck(:user_id).each do |user_id|
-      ActionCable.server.broadcast UnreadRoomsChannel.stream_name_for(user_id), payload, coder: nil
-    end
-  end
-
  private
-    # The fanout is one publish per member, which in a big room takes far longer than the
-    # rest of posting a message, so it runs in a job rather than while the poster waits.
-    def broadcast_unread_room_later
-      Message::BroadcastUnreadRoomJob.perform_later(self)
+    # Fanned out to the room's members rather than published on one global stream, so
+    # that the timing of activity in a room only reaches people who are in it.
+    def broadcast_unread_room
+      room.memberships.pluck(:user_id).each do |user_id|
+        ActionCable.server.broadcast UnreadRoomsChannel.stream_name_for(user_id), { roomId: room.id }
+      end
    end
 end
@@ -2,8 +2,7 @@ module Message::Mentionee
  extend ActiveSupport::Concern

  def mentionees
-    ids = mentioned_users.map(&:id)
-    ids.empty? ? User.none : room.users.where(id: ids)
+    room.users.where(id: mentioned_users.map(&:id))
  end

  private
@@ -3,31 +3,9 @@ module Message::Pagination

  PAGE_SIZE = 40

-  # Expose Rails' collection-preloading hook while preserving Array pagination and
-  # validators. The renderer passes only cache misses to preload_associations.
-  class Page < Array
-    def self.load(relation, direction, size)
-      new(relation.skip_preloading!.public_send(direction, size), relation)
-    end
-
-    def initialize(records, relation)
-      super(records)
-      @relation = relation
-    end
-
-    def loaded?
-      true
-    end
-
-    def preload_associations(records)
-      @relation.preload_associations(records)
-    end
-  end
-
  included do
-    # Keep presentation data lazy until the collection cache knows which messages missed.
-    scope :last_page, -> { last_page_of(PAGE_SIZE) }
-    scope :first_page, -> { Page.load(ordered, :first, PAGE_SIZE) }
+    scope :last_page, -> { ordered.last(PAGE_SIZE) }
+    scope :first_page, -> { ordered.first(PAGE_SIZE) }

    scope :before, ->(message) { where("created_at < ?", message.created_at) }
    scope :after, ->(message) { where("created_at > ?", message.created_at) }
@@ -36,23 +14,16 @@ module Message::Pagination
    scope :page_after, ->(message) { after(message).first_page }

    scope :page_created_since, ->(time) { where("created_at > ?", time).first_page }
-    # Sorting on +created_at, which no index covers, has SQLite find the few messages updated since
-    # through (room_id, updated_at) and sort just those, instead of walking the whole room by
-    # (room_id, created_at) looking for them.
-    scope :page_updated_since, ->(time) { Page.load(where("updated_at > ?", time).reorder(Arel.sql("+messages.created_at")), :last, PAGE_SIZE) }
+    scope :page_updated_since, ->(time) { where("updated_at > ?", time).last_page }
  end

  class_methods do
-    def last_page_of(size)
-      Page.load(ordered, :last, size)
-    end
-
    def page_around(message)
-      Page.new(page_before(message) + [ message ] + page_after(message), ordered)
+      page_before(message) + [ message ] + page_after(message)
    end

    def paged?
-      offset(PAGE_SIZE).exists?
+      count > PAGE_SIZE
    end
  end
 end
@@ -2,45 +2,11 @@ module Message::Searchable
  extend ActiveSupport::Concern

  included do
-    before_update        -> { @attachment_replaced = attachment_changes.key?("attachment") }
-    after_update_commit  :update_in_index, if: :indexed_text_changed?
+    after_create_commit  :create_in_index
+    after_update_commit  :update_in_index
    after_destroy_commit :remove_from_index

-    scope :search, ->(query) { joins("join message_search_index idx on messages.id = idx.rowid").where("idx.body match ?", match_terms(query)).ordered }
-  end
-
-  class_methods do
-    # Quotes each word, so that FTS5 searches for AND, OR, NOT and NEAR rather than
-    # parsing them as operators, which fails on a query like "AND" or "salt AND".
-    def match_terms(query)
-      query.split.map { |word| %("#{word.gsub('"', '""')}") }.join(" ")
-    end
-  end
-
-  class_methods do
-    def search_reachable(user, query, size: 100)
-      relation = user.reachable_messages.search(query).with_presentation
-      probe = connection.select_rows(sanitize_sql([ <<~SQL, user.id, match_terms(query) ]))
-        SELECT m.id, mm.user_id IS NOT NULL FROM message_search_index idx
-        JOIN messages m ON m.id = idx.rowid
-        LEFT JOIN memberships mm ON mm.room_id = m.room_id AND mm.user_id = ?
-        WHERE idx.body MATCH ? ORDER BY idx.rowid DESC LIMIT 1000
-      SQL
-      ids = probe.filter_map { |id, reachable| id if reachable == 1 }.first(size)
-
-      # A scoped fallback preserves older reachable hits behind a large private history.
-      if ids.size < size && probe.size == 1000
-        relation.last_page_of_matches(size)
-      else
-        Message::Pagination::Page.load(relation.where(id: ids).reorder(:id), :last, size)
-      end
-    end
-
-    # Orders by the index's rowid, which is the message id, so SQLite walks the full-text index
-    # newest first and stops at the page. Ordering by created_at sorted every match before paging.
-    def last_page_of_matches(size)
-      Message::Pagination::Page.load(reorder("idx.rowid"), :last, size)
-    end
+    scope :search, ->(query) { joins("join message_search_index idx on messages.id = idx.rowid").where("idx.body match ?", query).ordered }
  end

  private
@@ -48,12 +14,6 @@ module Message::Searchable
      execute_sql_with_binds "insert into message_search_index(rowid, body) values (?, ?)", id, plain_text_body
    end

-    # Boosts touch their message too: rewrite the index only when the body was saved or the attachment replaced.
-    # Active Storage clears attachment_changes in its own after_commit, before this one runs.
-    def indexed_text_changed?
-      association(:rich_text_body).target&.saved_change_to_body? || @attachment_replaced
-    end
-
    def update_in_index
      execute_sql_with_binds "update message_search_index set body = ? where rowid = ?", plain_text_body, id
    end
@@ -5,7 +5,6 @@ class Opengraph::Fetch
  ALLOWED_DOCUMENT_CONTENT_TYPE = "text/html"
  MAX_BODY_SIZE = 5.megabytes
  MAX_REDIRECTS = 10
-  TIMEOUT = 7.seconds # to connect (TLS included), and for each read and write, as Webhook does

  class TooManyRedirectsError < StandardError; end
  class RedirectDeniedError < StandardError; end
@@ -23,14 +22,9 @@ class Opengraph::Fetch
  end

  private
-    # The nil proxy address ignores http_proxy: a proxy would look the host up again, and the connection
-    # would no longer go to the checked IP.
-    #
-    # The timeouts bound each operation. A host can still send its headers or body a byte at a time,
-    # in as many reads as it likes: UnfurlLinksController puts the whole unfurl under one deadline.
    def request(url, request_class, ip:)
      MAX_REDIRECTS.times do
-        Net::HTTP.start(url.host, url.port, nil, ipaddr: ip, use_ssl: url.scheme == "https", **timeouts) do |http|
+        Net::HTTP.start(url.host, url.port, ipaddr: ip, use_ssl: url.scheme == "https") do |http|
          http.request request_class.new(url) do |response|
            if response.is_a?(Net::HTTPRedirection)
              url, ip = resolve_redirect(response["location"])
@@ -44,11 +38,6 @@ class Opengraph::Fetch
      raise TooManyRedirectsError
    end

-    # Without max_retries: 0, Net::HTTP sends a GET or HEAD that timed out a second time.
-    def timeouts
-      { open_timeout: TIMEOUT, read_timeout: TIMEOUT, write_timeout: TIMEOUT, max_retries: 0 }
-    end
-
    def resolve_redirect(location)
      url = URI.parse(location)
      raise RedirectDeniedError unless url.is_a?(URI::HTTP)
@@ -1,61 +1,7 @@
-require "restricted_http/private_network_guard"
-
 class Push::Subscription < ApplicationRecord
-  PERMITTED_ENDPOINT_HOSTS = %w[
-    jmt17.google.com
-    fcm.googleapis.com
-    updates.push.services.mozilla.com
-    web.push.apple.com
-    notify.windows.com
-  ].freeze
-
  belongs_to :user

-  validates :endpoint, presence: true
-  validate :validate_endpoint_url
-
-  def notification(badge: user.memberships.unread.count, **params)
-    # Defer DNS lookup to the delivery worker to prevent rebinding
-    WebPush::Notification.new(**params, badge: badge, endpoint: endpoint, endpoint_ip_resolver: method(:resolved_endpoint_ip), p256dh_key: p256dh_key, auth_key: auth_key)
+  def notification(**params)
+    WebPush::Notification.new(**params, badge: user.memberships.unread.count, endpoint: endpoint, p256dh_key: p256dh_key, auth_key: auth_key)
  end
-
-  # Validate at point of use, not just when saved.
-  def resolved_endpoint_ip
-    RestrictedHTTP::PrivateNetworkGuard.resolve(endpoint_uri.host) if permitted_endpoint_uri?
-  rescue RestrictedHTTP::Violation, Surfguard::Unresolvable
-    nil
-  end
-
-  private
-    # Validate endpoint shape. Belt & suspenders.
-    def permitted_endpoint_uri?
-      endpoint_uri&.scheme == "https" && endpoint_uri.port == 443 && permitted_endpoint_host?
-    end
-
-    def endpoint_uri
-      URI.parse(endpoint) if endpoint.present?
-    rescue URI::InvalidURIError
-      nil
-    end
-
-    def validate_endpoint_url
-      if endpoint_uri.nil?
-        errors.add(:endpoint, "is not a valid URL")
-      elsif endpoint_uri.scheme != "https"
-        errors.add(:endpoint, "must use HTTPS")
-      elsif endpoint_uri.port != 443
-        errors.add(:endpoint, "must use the default HTTPS port")
-      elsif !permitted_endpoint_host?
-        errors.add(:endpoint, "is not a permitted push service")
-      elsif resolved_endpoint_ip.nil?
-        errors.add(:endpoint, "resolves to a private or invalid IP address")
-      end
-    end
-
-    def permitted_endpoint_host?
-      host = endpoint_uri&.host&.downcase
-      host.present? && PERMITTED_ENDPOINT_HOSTS.any? do |permitted|
-        host == permitted || host.end_with?(".#{permitted}")
-      end
-    end
 end
@@ -1,24 +0,0 @@
-# Rebuild request-local models from bounded, immutable database snapshots.
-# The observer must still see the captured epoch after lookup and admission.
-class RecordCache
-  def self.fetch(key, version)
-    return yield unless version && ResponseCache.instance.budget.positive? && !FragmentCache.transaction_open?
-
-    key = ActiveSupport::Cache.expand_cache_key([ "record-snapshot-v1", version, key ])
-    return yield if key.bytesize > ResponseCache::MAX_KEY_BYTES
-
-    if snapshot = FragmentCache.store.read(key)
-      if ResponseCache.instance.version == version
-        return ActiveSupport::JSON.decode(snapshot).map { |name, attributes| name.constantize.instantiate(attributes) }
-      end
-    end
-
-    records = yield
-    if records.all? { |record| record&.persisted? && !record.changed? } && ResponseCache.instance.version == version
-      # Raw database values retain timestamp precision and native enum binding.
-      snapshot = ActiveSupport::JSON.encode(records.map { |record| [ record.class.name, record.attributes_before_type_cast ] })
-      FragmentCache.store.write(key, snapshot) if snapshot.bytesize <= ResponseCache::MAX_ENTRY_BYTES
-    end
-    records
-  end
-end
@@ -1,98 +0,0 @@
-require "sqlite3"
-
-# A read-only observer sees commits from every writer, including other runtimes.
-# PRAGMA data_version can only be compared on the same persistent connection.
-class ResponseCache
-  MAX_ENTRY_BYTES = 1.megabyte
-  MAX_KEY_BYTES = 2.kilobytes
-
-  def self.instance
-    INSTANCE
-  end
-
-  def initialize
-    @mutex = Mutex.new
-    @entries = {}
-    @bytes = 0
-    @render_locks = Array.new(16) { Mutex.new }
-  end
-
-  def budget
-    [ ENV.fetch("CAMPFIRE_RESPONSE_CACHE_MB", "64").to_i, 0 ].max.megabytes
-  end
-
-  def version
-    @mutex.synchronize { current_version }
-  rescue SQLite3::Exception
-    clear
-    nil
-  end
-
-  def read(key, version)
-    @mutex.synchronize do
-      @entries[key]&.first if current_version == version
-    end
-  rescue SQLite3::Exception
-    clear
-    nil
-  end
-
-  # Collapse cold renders without retaining a mutex for every viewer or URL.
-  # Rendering must never hold the observer/entry mutex: controllers read it too.
-  def synchronize_render(key, version, &block)
-    @render_locks[[ key, version ].hash % @render_locks.length].synchronize(&block)
-  end
-
-  def write(key, version, entry)
-    size = key.bytesize + entry[:body].bytesize + entry[:headers].sum { |name, value| name.bytesize + value.bytesize } + 256
-    return if key.bytesize > MAX_KEY_BYTES || size > [ budget, MAX_ENTRY_BYTES ].min
-
-    @mutex.synchronize do
-      return unless current_version == version
-      return if @entries.key?(key)
-
-      while @entries.any? && @bytes + size > budget
-        _, (_, removed_size) = @entries.shift
-        @bytes -= removed_size
-      end
-      @entries[key] = [ entry, size ]
-      @bytes += size
-    end
-  rescue SQLite3::Exception
-    clear
-  end
-
-  def clear
-    @mutex.synchronize do
-      @entries.clear
-      @bytes = 0
-      @observer&.close
-      @observer = @database = @version = nil
-    end
-  end
-
-  private
-    def current_version
-      database = File.expand_path(ActiveRecord::Base.connection_db_config.database)
-      if @database != database || !@observer
-        @entries.clear
-        @bytes = 0
-        @observer&.close
-        @observer = nil
-        @observer = SQLite3::Database.new(database, readonly: true)
-        @database = database
-        @namespace = SecureRandom.hex(16)
-        @version = nil
-      end
-
-      version = @observer.get_first_value("PRAGMA data_version")
-      if @version != version
-        @entries.clear
-        @bytes = 0
-        @version = version
-      end
-      [ @database, @namespace, @version ]
-    end
-
-  INSTANCE = new
-end
@@ -45,52 +45,11 @@ class Room < ApplicationRecord
    end
  end

-  # Takes the room away from its members at once, and leaves its messages to Room::DestroyJob. Destroying them in
-  # the room's own transaction held the database's write lock, and stopped every other write, until the last one.
-  # An open room is closed first, so that no one who joins the account before the job runs is let in.
-  def destroy_later
-    room = open? ? becomes!(Rooms::Closed) : self
-
-    former_member_ids = transaction do
-      room.save!
-      room.memberships.pluck(:user_id).tap { room.memberships.delete_all }
-    end
-
-    Room::DestroyJob.perform_later(room, former_member_ids)
-  end
-
-  # Deleting the memberships skips the reset that revoking one does, so the former members get it here, all at once,
-  # before the messages go: their connections stop receiving the room's streams. It's done in the job, not the
-  # request, because it costs a Redis round trip per member.
-  def reset_remote_connections_of(user_ids)
-    User.where(id: user_ids).find_each(&:reset_remote_connections)
-  end
-
-  # Each message is destroyed in its own transaction, so other writes get through in between. Any message posted
-  # meanwhile goes with the room.
-  def destroy_one_message_at_a_time
-    messages.find_each(&:destroy)
-    destroy
-  end
-
  def receive(message)
    unread_memberships(message)
    push_later(message)
  end

-  # Rewriting every member on every message is most of what posting to a large room writes,
-  # so members who are unread already stay as they are. Directs keep touching them all: a
-  # direct's sidebar row is cached by membership and shows the room's recency.
-  def unread_memberships(message)
-    recipients = memberships.visible.disconnected.where.not(user: message.creator)
-    recipients = recipients.where(unread_at: nil) unless direct?
-    recipients.update_all(unread_at: message.created_at, updated_at: Time.current)
-  end
-
-  def push_later(message)
-    Room::PushMessageJob.perform_later(self, message)
-  end
-
  def open?
    is_a?(Rooms::Open)
  end
@@ -116,4 +75,12 @@ class Room < ApplicationRecord
        errors.add :type, "can't be changed for a direct room"
      end
    end
+
+    def unread_memberships(message)
+      memberships.visible.disconnected.where.not(user: message.creator).update_all(unread_at: message.created_at, updated_at: Time.current)
+    end
+
+    def push_later(message)
+      Room::PushMessageJob.perform_later(self, message)
+    end
 end
@@ -6,9 +6,9 @@ class Room::MessagePusher
  end

  def push
-    subscriptions = push_subscriptions_for_users_involved_in_everything.or(push_subscriptions_for_mentionable_users(message.mentionees))
-    if subscriptions.exists?
-      Rails.configuration.x.web_push_pool.queue(build_payload, subscriptions)
+    build_payload.tap do |payload|
+      push_to_users_involved_in_everything(payload)
+      push_to_users_involved_in_mentions(payload)
    end
  end

@@ -37,6 +37,14 @@ class Room::MessagePusher
      }
    end

+    def push_to_users_involved_in_everything(payload)
+      enqueue_payload_for_delivery payload, push_subscriptions_for_users_involved_in_everything
+    end
+
+    def push_to_users_involved_in_mentions(payload)
+      enqueue_payload_for_delivery payload, push_subscriptions_for_mentionable_users(message.mentionees)
+    end
+
    def push_subscriptions_for_users_involved_in_everything
      relevant_subscriptions.merge(Membership.involved_in_everything)
    end
@@ -45,12 +53,13 @@ class Room::MessagePusher
      relevant_subscriptions.merge(Membership.involved_in_mentions).where(user_id: mentionees.ids)
    end

-    # Banning keeps the user's subscriptions, so that unbanning brings their notifications back,
-    # but nobody who can't sign in should be sent what's said in their rooms meanwhile.
    def relevant_subscriptions
      Push::Subscription
        .joins(user: :memberships)
-        .merge(User.active)
-        .merge(Membership.visible.disconnected.where(room: room).where.not(user_id: message.creator_id))
+        .merge(Membership.visible.disconnected.where(room: room).where.not(user: message.creator))
+    end
+
+    def enqueue_payload_for_delivery(payload, subscriptions)
+      Rails.configuration.x.web_push_pool.queue(payload, subscriptions)
    end
 end
@@ -1,99 +0,0 @@
-# Keeps rooms.messages_count correct for ordinary SQLite writes — Rails, bulk SQL,
-# and foreign connections — without ActiveRecord counter_cache callbacks that
-# those paths skip (and that would double-count if combined with triggers).
-# Foreign REPLACE writes require PRAGMA recursive_triggers=ON so SQLite also
-# fires the delete trigger. Migrations rebuilding messages must call ensure!
-# before reading counters inside that migration; database tasks repair afterwards.
-class Room::MessagesCount
-  INSERT_TRIGGER = "messages_ai_rooms_messages_count"
-  DELETE_TRIGGER = "messages_ad_rooms_messages_count"
-  UPDATE_TRIGGER = "messages_au_rooms_messages_count"
-  TRIGGERS = [ INSERT_TRIGGER, DELETE_TRIGGER, UPDATE_TRIGGER ].freeze
-
-  class << self
-    def install!(connection = ActiveRecord::Base.connection)
-      with_immediate_write(connection) do
-        replace_triggers!(connection)
-      end
-    end
-
-    def uninstall!(connection = ActiveRecord::Base.connection)
-      TRIGGERS.each do |name|
-        connection.execute("DROP TRIGGER IF EXISTS #{name}")
-      end
-    end
-
-    def backfill!(connection = ActiveRecord::Base.connection)
-      connection.execute <<~SQL
-        UPDATE rooms SET messages_count = (
-          SELECT COUNT(*) FROM messages WHERE messages.room_id = rooms.id
-        )
-      SQL
-    end
-
-    # schema.rb does not dump SQLite triggers; reinstall after schema:load.
-    # Repair rechecks, rebuilds counts, and installs triggers in one write txn
-    # so concurrent writers and concurrent boot repairs cannot observe a gap.
-    def ensure!(connection = ActiveRecord::Base.connection)
-      return unless connection.adapter_name.match?(/sqlite/i)
-      return unless connection.data_source_exists?(:rooms)
-      return unless connection.column_exists?(:rooms, :messages_count)
-      return if triggers_installed?(connection)
-
-      with_immediate_write(connection) do
-        next if triggers_installed?(connection)
-
-        uninstall!(connection)
-        backfill!(connection)
-        create_triggers!(connection)
-      end
-    end
-
-    def trigger_installed?(connection, name)
-      connection.select_value(
-        "SELECT 1 FROM sqlite_master WHERE type = 'trigger' AND name = #{connection.quote(name)}"
-      ).present?
-    end
-
-    def triggers_installed?(connection = ActiveRecord::Base.connection)
-      TRIGGERS.all? { |name| trigger_installed?(connection, name) }
-    end
-
-    private
-      def with_immediate_write(connection)
-        if connection.transaction_open?
-          yield
-        else
-          connection.raw_connection.transaction(:immediate) { yield }
-        end
-      end
-
-      def replace_triggers!(connection)
-        uninstall!(connection)
-        create_triggers!(connection)
-      end
-
-      def create_triggers!(connection)
-        connection.execute <<~SQL
-          CREATE TRIGGER #{INSERT_TRIGGER} AFTER INSERT ON messages
-          BEGIN
-            UPDATE rooms SET messages_count = messages_count + 1 WHERE id = NEW.room_id;
-          END
-        SQL
-        connection.execute <<~SQL
-          CREATE TRIGGER #{DELETE_TRIGGER} AFTER DELETE ON messages
-          BEGIN
-            UPDATE rooms SET messages_count = messages_count - 1 WHERE id = OLD.room_id;
-          END
-        SQL
-        connection.execute <<~SQL
-          CREATE TRIGGER #{UPDATE_TRIGGER} AFTER UPDATE OF room_id ON messages
-          WHEN OLD.room_id IS NOT NEW.room_id
-          BEGIN
-            UPDATE rooms SET messages_count = messages_count - 1 WHERE id = OLD.room_id;
-            UPDATE rooms SET messages_count = messages_count + 1 WHERE id = NEW.room_id;
-          END
-        SQL
-      end
-  end
-end
@@ -7,15 +7,12 @@ class Rooms::Direct < Room
    end

    private
-      # Among the first user's rooms, the one whose members are exactly these users: as many
-      # memberships as users, and all of them theirs.
+      # FIXME: Find a more performant algorithm that won't be a problem on accounts with 10K+ direct rooms,
+      # which could be to store the membership id list as a hash on the room, and use that for lookup.
      def find_for(users)
-        user_ids = users.pluck(:id).uniq
-
-        where(id: Membership.where(user_id: user_ids.first).select(:room_id))
-          .joins(:memberships).group(:id)
-          .having("COUNT(*) = :size AND COUNT(CASE WHEN memberships.user_id IN (:user_ids) THEN 1 END) = :size", size: user_ids.size, user_ids: user_ids)
-          .first
+        all.joins(:users).detect do |room|
+          Set.new(room.user_ids) == Set.new(users.pluck(:id))
+        end
      end
  end

@@ -50,18 +50,8 @@ class User < ApplicationRecord
  end

  private
-    # One statement, which SQLite runs under the write lock, so no room is closed between reading the open ones and
-    # inserting. A room that Room#destroy_later closes is either closed before, and skipped, or after, and takes this
-    # membership away with the others. A room that granted itself to every user when it was created is skipped too,
-    # as insert_all did.
    def grant_membership_to_open_rooms
-      now = Time.current
-
-      Membership.connection.execute Membership.sanitize_sql([ <<~SQL, id, now, now ])
-        insert into memberships (room_id, user_id, created_at, updated_at)
-        select id, ?, ?, ? from rooms where type = 'Rooms::Open'
-        on conflict do nothing
-      SQL
+      Membership.insert_all(Rooms::Open.pluck(:id).collect { |room_id| { room_id: room_id, user_id: id } })
    end

    def deactived_email_address
@@ -1,11 +1,6 @@
 module User::Bannable
  extend ActiveSupport::Concern

-  included do
-    # Administrators still see banned users, so they can lift the ban.
-    scope :visible_to, ->(user) { user.can_administer? ? where(status: %i[ active banned ]) : active }
-  end
-
  def ban
    transaction do
      create_bans_from_sessions
@@ -1,18 +1,11 @@
 module User::Mentionable
  include ActionText::Attachable

-  MENTION_CONTENT_TYPE = "application/vnd.campfire.mention"
-
-  def attachable_content_type
-    MENTION_CONTENT_TYPE
-  end
-
  def to_attachable_partial_path
    "users/mention"
  end

-  # How a mention appears inside the editor, matching the prompt's editor template.
-  def to_editor_content_attachment_partial_path
+  def to_trix_content_attachment_partial_path
    "users/mention"
  end

@@ -63,7 +63,7 @@ class Webhook < ApplicationRecord
    end

    def extract_attachment_from(response)
-      if response.code == "200" && response.content_type && mime_type = Mime::Type.lookup(response.content_type)
+      if response.content_type && mime_type = Mime::Type.lookup(response.content_type)
        ActiveStorage::Blob.create_and_upload! \
          io: StringIO.new(response.body), filename: "attachment.#{mime_type.symbol}", content_type: mime_type.to_s
      end
@@ -76,9 +76,10 @@
        <% end %>

        <label class="switch">
-          <%= tag.input type: "checkbox", class: "switch__input",
-                checked: Current.account.settings.restrict_room_creation_to_administrators?,
-                data: { action: "change->form#submit" } %>
+          <input type="checkbox"
+                class="switch__input"
+                <%= "checked" if Current.account.settings.restrict_room_creation_to_administrators? %>
+                data-action="change->form#submit">
          <span class="switch__btn round"></span>
          <span class="for-screen-reader">
            Must be admin to create new rooms
@@ -101,11 +102,11 @@
      <turbo-frame id="account_users">
        <%= render partial: "accounts/users/user", collection: @administrators, as: :user %>

-        <% if @administrators.any? && @page.records.any? %>
+        <% if @administrators.any? && @members.any? %>
          <hr class="separator full-width" style="--border-style: solid">
        <% end %>

-        <%= render partial: "accounts/users/user", collection: @page.records, as: :user %>
+        <%= render partial: "accounts/users/user", collection: @members, as: :user %>
        <%= render "accounts/users/next_page_container", page: @page.next_param unless @page.last? %>
      </turbo-frame>
    </menu>
@@ -1,11 +1,11 @@
 <figure class="attachment attachment--content attachment--og">
  <actiontext-opengraph-embed>
-    <div class="og-embed gap <%= "og-embed--twitter-avatar" if opengraph_embed.twitter_avatar? %>">
+    <div class="og-embed gap">
      <div class="og-embed__content">
        <div class="og-embed__title">
-          <%= link_to_if opengraph_embed.href.present?, truncate(opengraph_embed.filename, length: 280, omission: "…"), opengraph_embed.href, rel: "noreferrer", target: "_blank" %>
+          <%= link_to truncate(opengraph_embed.filename, length: 280, omission: "…"), opengraph_embed.href, rel: "noreferrer", target: "_blank" %>
        </div>
-        <div class="og-embed__description"><%= truncate(opengraph_embed.description.to_s, length: 560, omission: "…") %></div>
+        <div class="og-embed__description"><%= truncate(opengraph_embed.caption, length: 560, omission: "…").html_safe %></div>
      </div>
      <% if opengraph_embed.url %>
        <div class="og-embed__image">
@@ -1,13 +0,0 @@
-<%# Files are posted as a message's own attachment, which gets its preview when it's posted; the composer adds none to
-    the rich text. One that's there anyway is shown by its name, with no preview: Action Text's partial links to a URL
-    that makes one on view, and nothing else in the app would make it. %>
-<figure class="attachment attachment--file attachment--<%= blob.filename.extension %>">
-  <figcaption class="attachment__caption">
-    <% if caption = blob.try(:caption) %>
-      <%= caption %>
-    <% else %>
-      <span class="attachment__name"><%= blob.filename %></span>
-      <span class="attachment__size"><%= number_to_human_size blob.byte_size %></span>
-    <% end %>
-  </figcaption>
-</figure>
@@ -1,11 +0,0 @@
-<lexxy-prompt-item search="<%= user.name %>" sgid="<%= user.attachable_sgid %>">
-  <template type="menu">
-    <span class="autocomplete__item flex align-center gap unpad">
-      <%= avatar_tag user %>
-      <span class="autocompletable__name"><%= user.name %></span>
-    </span>
-  </template>
-  <template type="editor">
-    <%= render "users/mention", user: user %>
-  </template>
-</lexxy-prompt-item>
@@ -1 +0,0 @@
-<%= render partial: "autocompletable/users/prompt_item", collection: @page.records, as: :user %>
@@ -1,3 +1,3 @@
-<div class="lexxy-content">
+<div class="trix-content">
  <%= yield -%>
 </div>
@@ -9,6 +9,7 @@
    <meta name="theme-color" content="#ffffff" media="(prefers-color-scheme: light)">
    <meta name="theme-color" content="#000000" media="(prefers-color-scheme: dark)">
    <meta name="apple-mobile-web-app-capable" content="yes">
+    <%= csrf_meta_tags %>
    <%= csp_meta_tag %>
    <%= current_user_meta_tags %>
    <%= script_aware_action_cable_meta_tag %>
@@ -39,9 +40,9 @@
      <div class="flash" data-controller="element-removal" data-action="animationend->element-removal#remove">
        <div class="flash__inner shadow" style="<%= "--flash-background: var(--color-negative)" if flash[:alert] %>">
          <% if flash[:alert] %>
-            <%= image_tag "alert.svg", aria: { hidden: true }, size: 24, class: "colorize--white" %>
+            <%= image_tag "alert.svg", aria: { hidden: true }, size: 24, class: "colorize--white" %></span>
          <% else %>
-            <%= image_tag "check.svg", aria: { hidden: true }, size: 24, class: "colorize--white" %>
+            <%= image_tag "check.svg", aria: { hidden: true }, size: 24, class: "colorize--white" %></span>
          <% end %>
        </div>
        <span class="for-screen-reader" role="alert" aria-atomic="true"><%= notice %></span>
Author	SHA1	Message	Date
Jeremy Daer	9c8f4cd272	Keep the CSP nonce cookie off public cacheable responses The nonce generator runs for every response that carries the policy, so the nonce_id cookie was set on QR codes, logos, avatars and disk-served blobs — all public, shared-cacheable. Those endpoints now opt out of the policy, so no cache can replay one client's identifier and nonce.	2026-09-13 17:01:24 -07:00
Jeremy Daer	465b372935	Tokenize CSP_EXTRA_* semicolons to avoid a per-request 500 A per-request policy build (forced by the nonce) means a stray semicolon in a CSP_EXTRA_* value — a plausible operator paste like "https://youtube.com; https://vimeo.com" — lands inside a single source token and makes Rails raise InvalidDirectiveError on every request, a site-wide 500 even in report-only mode. Split on ';' alongside comma and whitespace so such a value tokenizes into valid sources. Rails still validates each token, so no injection is introduced (a token with an embedded space still fails validation).	2026-08-08 19:37:53 -07:00
Jeremy Daer	b11ed1cb6e	Make CSP embed directives configurable per install Campfire is self-hosted per customer: an admin may embed or connect to external hosts (video/embed providers, image CDNs, analytics, form or webhook endpoints) that vary per install and are unknown at build time. Hardcoding these directives at :self would break those integrations once the policy is enforced. Read per-install extras from ENV (CSP_EXTRA_SCRIPT_SRC, _STYLE_SRC, _IMG_SRC, _CONNECT_SRC, _FRAME_SRC, _FORM_ACTION), each a comma- or whitespace-separated host list, appended to the :self baseline. Unset by default, so the policy stays at :self only unless an admin opts in.	2026-08-08 18:33:58 -07:00
Jeremy Daer	99266973fd	Add a session-stable CSP nonce and complete the directive set Layer a Turbo-safe nonce and a full directive set onto the Report-Only baseline, still without enforcing anything. The nonce is the HMAC-SHA256 of a stable per-visitor cookie, keyed by secret_key_base. It stays constant across a session's requests so Turbo snapshot restores don't replay a stale nonce and trip the policy, while staying unpredictable to a client that can set the cookie but not the secret. importmap-rails auto-nonces the importmap JSON and shim, the only inline scripts the app renders (the message _template is a non-executed text/template data block). script-src gains the nonce; style-src keeps unsafe_inline for now (inline style= attributes across the composer and ActionText content aren't nonceable yet); img/connect/frame-src start at :self as tuning starting points for the report-only window. report_only stays true; enforcement is a later flip.	2026-08-08 17:30:58 -07:00
Jeremy Daer	f09110c14d	Add a Report-Only Content-Security-Policy baseline Campfire ships no CSP today (the initializer is the stock, fully-commented file). This adds a conservative Report-Only policy — default-src 'self'; object-src 'none'; base-uri/frame-ancestors/form-action 'self' — so browsers evaluate and report violations without enforcing anything. Rendering and behavior are unaffected. Next steps: wire a report endpoint, tune against observed violations, then flip content_security_policy_report_only off to enforce.	2026-08-08 14:27:51 -07:00
@@ -1 +1 @@
 .0.7
 .4.5
				`@@ -1 +0,0 @@`
				`<%= render partial: "autocompletable/users/prompt_item", collection: @page.records, as: :user %>`