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Backport #37327 by @prettysunflower Nyallo~ In pull request #36901, a change is made so that the link to authentication sources is now escaped with the QueryEscape filter. https://github.com/go-gitea/gitea/pull/36901/changes#diff-34c39c9736a8b62e293c0c0b24c4b5b8c1c792790018c5809f9ff2cbc12b16b1R4 The problem is that [QueryEscape replace spaces with the `+` character](https://cs.opensource.google/go/go/+/refs/tags/go1.26.2:src/net/url/url.go;l=234;drc=917949cc1d16c652cb09ba369718f45e5d814d8f), and this is not unescaped when a user tries to log in with an authentication source that contains a space, which throws an error. This commit fixes that by unescaping the provider name in the URL. --- Example of the error, on my instance, when I try to log in with `prettysunflower's auth` ``` 2026/04/21 00:11:41 routers/web/auth/oauth.go:42:SignInOAuth() [E] SignIn: oauth2 source not found, name: "prettysunflower's+auth" /go/src/code.gitea.io/gitea/routers/web/auth/oauth.go:42 (0x2cfa5c5) /usr/local/go/src/reflect/value.go:586 (0x51e245) /usr/local/go/src/reflect/value.go:369 (0x51d0f8) /go/src/code.gitea.io/gitea/modules/web/handler.go:181 (0x1a6aaf6) /usr/local/go/src/net/http/server.go:2286 (0x94dc88) /usr/local/go/src/net/http/server.go:2286 (0x94dc88) /go/src/code.gitea.io/gitea/modules/web/handler.go:188 (0x1a6ab65) /usr/local/go/src/net/http/server.go:2286 (0x94dc88) /go/src/code.gitea.io/gitea/modules/web/handler.go:188 (0x1a6ab65) /usr/local/go/src/net/http/server.go:2286 (0x94dc88) /go/src/code.gitea.io/gitea/modules/web/handler.go:188 (0x1a6ab65) /usr/local/go/src/net/http/server.go:2286 (0x94dc88) /go/src/code.gitea.io/gitea/services/context/context.go:217 (0x2df1b23) /usr/local/go/src/net/http/server.go:2286 (0x94dc88) /go/src/code.gitea.io/gitea/modules/web/handler.go:145 (0x1a6afb5) /usr/local/go/src/net/http/server.go:2286 (0x94dc88) /go/pkg/mod/gitea.com/go-chi/session@v0.0.0-20251124165456-68e0254e989e/session.go:258 (0x197eb82) /usr/local/go/src/net/http/server.go:2286 (0x94dc88) /go/src/code.gitea.io/gitea/modules/web/handler.go:145 (0x1a6afb5) /usr/local/go/src/net/http/server.go:2286 (0x94dc88) /go/pkg/mod/github.com/go-chi/chi/v5@v5.2.5/chain.go:31 (0x1a61d05) /go/pkg/mod/github.com/go-chi/chi/v5@v5.2.5/mux.go:479 (0x1a64fae) /usr/local/go/src/net/http/server.go:2286 (0x94dc88) /go/pkg/mod/github.com/go-chi/chi/v5@v5.2.5/mux.go:73 (0x1a628c2) /go/pkg/mod/github.com/go-chi/chi/v5@v5.2.5/mux.go:321 (0x1a6421a) /usr/local/go/src/net/http/server.go:2286 (0x94dc88) /go/pkg/mod/github.com/go-chi/chi/v5@v5.2.5/chain.go:31 (0x1a61d05) /go/pkg/mod/github.com/go-chi/chi/v5@v5.2.5/mux.go:479 (0x1a64fae) /usr/local/go/src/net/http/server.go:2286 (0x94dc88) /go/pkg/mod/github.com/go-chi/chi/v5@v5.2.5/middleware/get_head.go:37 (0x2c33a67) /usr/local/go/src/net/http/server.go:2286 (0x94dc88) /go/src/code.gitea.io/gitea/modules/web/handler.go:145 (0x1a6afb5) /usr/local/go/src/net/http/server.go:2286 (0x94dc88) /go/pkg/mod/github.com/go-chi/chi/v5@v5.2.5/mux.go:73 (0x1a628c2) /go/pkg/mod/github.com/go-chi/chi/v5@v5.2.5/mux.go:321 (0x1a6421a) /usr/local/go/src/net/http/server.go:2286 (0x94dc88) /go/src/code.gitea.io/gitea/routers/common/maintenancemode.go:50 (0x2b752da) /usr/local/go/src/net/http/server.go:2286 (0x94dc88) /go/src/code.gitea.io/gitea/modules/web/handler.go:145 (0x1a6afb5) /usr/local/go/src/net/http/server.go:2286 (0x94dc88) /go/pkg/mod/github.com/go-chi/chi/v5@v5.2.5/chain.go:31 (0x1a61d05) /go/pkg/mod/github.com/go-chi/chi/v5@v5.2.5/mux.go:479 (0x1a64fae) /usr/local/go/src/net/http/server.go:2286 (0x94dc88) /go/src/code.gitea.io/gitea/modules/web/routing/logger_manager.go:124 (0x127d1ec) /usr/local/go/src/net/http/server.go:2286 (0x94dc88) /go/src/code.gitea.io/gitea/modules/web/handler.go:145 (0x1a6afb5) /usr/local/go/src/net/http/server.go:2286 (0x94dc88) /go/pkg/mod/github.com/chi-middleware/proxy@v1.1.1/middleware.go:37 (0x2b76acf) /usr/local/go/src/net/http/server.go:2286 (0x94dc88) /go/src/code.gitea.io/gitea/modules/web/handler.go:145 (0x1a6afb5) /usr/local/go/src/net/http/server.go:2286 (0x94dc88) /go/src/code.gitea.io/gitea/routers/common/middleware.go:89 (0x2b78cd6) /usr/local/go/src/net/http/server.go:2286 (0x94dc88) /go/src/code.gitea.io/gitea/modules/web/handler.go:145 (0x1a6afb5) /usr/local/go/src/net/http/server.go:2286 (0x94dc88) /go/src/code.gitea.io/gitea/routers/common/middleware.go:104 (0x2b7890f) /usr/local/go/src/net/http/server.go:2286 (0x94dc88) /go/src/code.gitea.io/gitea/modules/web/handler.go:145 (0x1a6afb5) /usr/local/go/src/net/http/server.go:2286 (0x94dc88) /go/pkg/mod/github.com/go-chi/chi/v5@v5.2.5/mux.go:90 (0x1a62881) /go/src/code.gitea.io/gitea/modules/web/router.go:286 (0x1a6d2a2) /go/src/code.gitea.io/gitea/modules/web/router.go:221 (0x1a6cbc6) /usr/local/go/src/net/http/server.go:3311 (0x96e36d) /usr/local/go/src/net/http/server.go:2073 (0x94bd6f) /usr/local/go/src/runtime/asm_amd64.s:1771 (0x49af20) ``` Signed-off-by: prettysunflower <me@prettysunflower.moe> Signed-off-by: wxiaoguang <wxiaoguang@gmail.com> Co-authored-by: prettysunflower <me@prettysunflower.moe> Co-authored-by: wxiaoguang <wxiaoguang@gmail.com> Co-authored-by: silverwind <me@silverwind.io>