add other session providers (#5963)

vendor/github.com/go-macaron/session/flash.go

@@ -0,0 +1,61 @@
+// Copyright 2018 The Macaron Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License"): you may
+// not use this file except in compliance with the License. You may obtain
+// a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+// License for the specific language governing permissions and limitations
+// under the License.
+
+package session
+
+import (
+	"net/url"
+
+	"gopkg.in/macaron.v1"
+)
+
+type Flash struct {
+	ctx *macaron.Context
+	url.Values
+	ErrorMsg, WarningMsg, InfoMsg, SuccessMsg string
+}
+
+func (f *Flash) set(name, msg string, current ...bool) {
+	isShow := false
+	if (len(current) == 0 && macaron.FlashNow) ||
+		(len(current) > 0 && current[0]) {
+		isShow = true
+	}
+
+	if isShow {
+		f.ctx.Data["Flash"] = f
+	} else {
+		f.Set(name, msg)
+	}
+}
+
+func (f *Flash) Error(msg string, current ...bool) {
+	f.ErrorMsg = msg
+	f.set("error", msg, current...)
+}
+
+func (f *Flash) Warning(msg string, current ...bool) {
+	f.WarningMsg = msg
+	f.set("warning", msg, current...)
+}
+
+func (f *Flash) Info(msg string, current ...bool) {
+	f.InfoMsg = msg
+	f.set("info", msg, current...)
+}
+
+func (f *Flash) Success(msg string, current ...bool) {
+	f.SuccessMsg = msg
+	f.set("success", msg, current...)
+}