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flash.go
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flash.go
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package peony
import (
"fmt"
"net/http"
"net/url"
"regexp"
)
var (
cookieKeyValueParser = regexp.MustCompile("\x00([^:]*):([^\x00]*)\x00")
CookiePrefix = "PEONY"
CookieHttpOnly = false
CookieSecure = false
)
func ParseKeyValueCookie(val string, cb func(key, val string)) {
val, _ = url.QueryUnescape(val)
if matches := cookieKeyValueParser.FindAllStringSubmatch(val, -1); matches != nil {
for _, match := range matches {
cb(match[1], match[2])
}
}
}
type Flash struct {
In, Out map[string]string
}
func (f Flash) Error(msg string, args ...interface{}) {
if len(args) == 0 {
f.Out["error"] = msg
} else {
f.Out["error"] = fmt.Sprintf(msg, args...)
}
}
// Success serializes the given msg and args to a "success" key within
// the Flash cookie.
func (f Flash) Success(msg string, args ...interface{}) {
if len(args) == 0 {
f.Out["success"] = msg
} else {
f.Out["success"] = fmt.Sprintf(msg, args...)
}
}
func GetFlashFilter(s *Server) Filter {
CookieHttpOnly = s.App.GetBoolConfig("CookieHttpOnly", false)
CookieSecure = s.App.GetBoolConfig("CookieSecure", false)
CookiePrefix = s.App.GetStringConfig("CookiePrefix", "PEONY")
return func (c *Controller, fc []Filter) {
c.Flash = restoreFlash(c.Req.Request)
fc[0](c, fc[1:])
// Store the flash.
var flashValue string
for key, value := range c.Flash.Out {
flashValue += "\x00" + key + ":" + value + "\x00"
}
c.SetCookie(&http.Cookie{
Name: CookiePrefix + "_FLASH",
Value: url.QueryEscape(flashValue),
HttpOnly: CookieHttpOnly,
Secure: CookieSecure,
Path: "/",
})
}
}
func restoreFlash(req *http.Request) *Flash {
flash := &Flash{
In: make(map[string]string),
Out: make(map[string]string),
}
if cookie, err := req.Cookie(CookiePrefix + "_FLASH"); err == nil {
ParseKeyValueCookie(cookie.Value, func(key, val string) {
flash.In[key] = val
})
}
return flash
}