flash support

+package beego
+
+import (
+	"fmt"
+	"net/url"
+	"strings"
+)
+
+type FlashData struct {
+	Data map[string]string
+}
+
+func (fd *FlashData) Notice(msg string, args ...interface{}) {
+	if len(args) == 0 {
+		fd.Data["notice"] = msg
+	} else {
+		fd.Data["notice"] = fmt.Sprintf(msg, args...)
+	}
+}
+
+func (fd *FlashData) Warning(msg string, args ...interface{}) {
+	if len(args) == 0 {
+		fd.Data["warning"] = msg
+	} else {
+		fd.Data["warning"] = fmt.Sprintf(msg, args...)
+	}
+}
+
+func (fd *FlashData) Error(msg string, args ...interface{}) {
+	if len(args) == 0 {
+		fd.Data["error"] = msg
+	} else {
+		fd.Data["error"] = fmt.Sprintf(msg, args...)
+	}
+}
+
+func (fd *FlashData) Store(c *Controller) {
+	c.Data["flash"] = fd.Data
+	var flashValue string
+	for key, value := range fd.Data {
+		flashValue += "\x00" + key + ":" + value + "\x00"
+	}
+	c.Ctx.SetCookie("BEEGO_FLASH", url.QueryEscape(flashValue), 0, "/")
+}
+
+func ReadFromRequest(c *Controller) *FlashData {
+	flash := &FlashData{
+		Data: make(map[string]string),
+	}
+	if cookie, err := c.Ctx.Request.Cookie("BEEGO_FLASH"); err == nil {
+		vals := strings.Split(cookie.Value, "\x00")
+		for _, v := range vals {
+			if len(v) > 0 {
+				kv := strings.Split(v, ":")
+				if len(kv) == 2 {
+					flash.Data[kv[0]] = kv[1]
+				}
+			}
+		}
+		//read one time then delete it
+		cookie.MaxAge = -1
+		c.Ctx.Request.AddCookie(cookie)
+	}
+	c.Data["flash"] = flash.Data
+	return flash
+}