// beego filter handler for serve captcha image
func (c *Captcha) Handler(ctx *context.Context) {
var chars []byte
id := path.Base(ctx.Request.RequestURI)
if i := strings.Index(id, "."); i != -1 {
id = id[:i]
}
key := c.key(id)
if len(ctx.Input.Query("reload")) > 0 {
chars = c.genRandChars()
if err := c.store.Put(key, chars, c.Expiration); err != nil {
ctx.Output.SetStatus(500)
ctx.WriteString("captcha reload error")
beego.Error("Reload Create Captcha Error:", err)
return
}
} else {
if v, ok := c.store.Get(key).([]byte); ok {
chars = v
} else {
ctx.Output.SetStatus(404)
ctx.WriteString("captcha not found")
return
}
}
img := NewImage(chars, c.StdWidth, c.StdHeight)
if _, err := img.WriteTo(ctx.ResponseWriter); err != nil {
beego.Error("Write Captcha Image Error:", err)
}
}
// show error string as simple text message.
// if error string is empty, show 500 error as default.
func exception(errcode string, ctx *context.Context) {
code, err := strconv.Atoi(errcode)
if err != nil {
code = 503
}
if h, ok := ErrorMaps[errcode]; ok {
executeError(h, ctx, code)
return
} else if h, ok := ErrorMaps["503"]; ok {
executeError(h, ctx, code)
return
} else {
ctx.ResponseWriter.WriteHeader(code)
ctx.WriteString(errcode)
}
}