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flash.go 2.46 KB
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astaxie authored 2014-08-18 16:41 . update the documents & comments
// Copyright 2014 beego Author. All Rights Reserved.
//
// 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 beego
import (
"fmt"
"net/url"
"strings"
)
// FlashData is a tools to maintain data when using across request.
type FlashData struct {
Data map[string]string
}
// NewFlash return a new empty FlashData struct.
func NewFlash() *FlashData {
return &FlashData{
Data: make(map[string]string),
}
}
// Notice writes notice message to flash.
func (fd *FlashData) Notice(msg string, args ...interface{}) {
if len(args) == 0 {
fd.Data["notice"] = msg
} else {
fd.Data["notice"] = fmt.Sprintf(msg, args...)
}
}
// Warning writes warning message to flash.
func (fd *FlashData) Warning(msg string, args ...interface{}) {
if len(args) == 0 {
fd.Data["warning"] = msg
} else {
fd.Data["warning"] = fmt.Sprintf(msg, args...)
}
}
// Error writes error message to flash.
func (fd *FlashData) Error(msg string, args ...interface{}) {
if len(args) == 0 {
fd.Data["error"] = msg
} else {
fd.Data["error"] = fmt.Sprintf(msg, args...)
}
}
// Store does the saving operation of flash data.
// the data are encoded and saved in cookie.
func (fd *FlashData) Store(c *Controller) {
c.Data["flash"] = fd.Data
var flashValue string
for key, value := range fd.Data {
flashValue += "\x00" + key + "\x23" + FlashSeperator + "\x23" + value + "\x00"
}
c.Ctx.SetCookie(FlashName, url.QueryEscape(flashValue), 0, "/")
}
// ReadFromRequest parsed flash data from encoded values in cookie.
func ReadFromRequest(c *Controller) *FlashData {
flash := NewFlash()
if cookie, err := c.Ctx.Request.Cookie(FlashName); err == nil {
v, _ := url.QueryUnescape(cookie.Value)
vals := strings.Split(v, "\x00")
for _, v := range vals {
if len(v) > 0 {
kv := strings.Split(v, "\x23"+FlashSeperator+"\x23")
if len(kv) == 2 {
flash.Data[kv[0]] = kv[1]
}
}
}
//read one time then delete it
c.Ctx.SetCookie(FlashName, "", -1, "/")
}
c.Data["flash"] = flash.Data
return flash
}
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