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captcha.go
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/
captcha.go
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package service
import (
"bytes"
"net/http"
"time"
"github.com/dchest/captcha"
"github.com/gin-contrib/sessions"
"github.com/gin-gonic/gin"
)
type CaptchaService struct{}
func (service *CaptchaService) GetCaptcha(c *gin.Context, length ...int) {
l := captcha.DefaultLen
w, h := 107, 36
if len(length) == 1 {
l = length[0]
}
if len(length) == 2 {
w = length[1]
}
if len(length) == 3 {
h = length[2]
}
captchaId := captcha.NewLen(l)
session := sessions.Default(c)
session.Set("captcha", captchaId)
_ = session.Save()
_ = Serve(c.Writer, c.Request, captchaId, ".png", "zh", false, w, h)
}
func Serve(w http.ResponseWriter, r *http.Request, id, ext, lang string, download bool, width, height int) error {
w.Header().Set("Cache-Control", "no-cache, no-store, must-revalidate")
w.Header().Set("Pragma", "no-cache")
w.Header().Set("Expires", "0")
var content bytes.Buffer
switch ext {
case ".png":
w.Header().Set("Content-Type", "image/png")
_ = captcha.WriteImage(&content, id, width, height)
case ".wav":
w.Header().Set("Content-Type", "audio/x-wav")
_ = captcha.WriteAudio(&content, id, lang)
default:
return captcha.ErrNotFound
}
if download {
w.Header().Set("Content-Type", "application/octet-stream")
}
http.ServeContent(w, r, id+ext, time.Time{}, bytes.NewReader(content.Bytes()))
return nil
}