mirror of https://github.com/astaxie/beego.git
185 lines
3.9 KiB
Go
185 lines
3.9 KiB
Go
|
package captcha
|
||
|
|
||
|
// modifiy and integrated to Beego in one file from https://github.com/dchest/captcha
|
||
|
|
||
|
import (
|
||
|
"fmt"
|
||
|
"html/template"
|
||
|
"net/http"
|
||
|
"path"
|
||
|
"strings"
|
||
|
|
||
|
"github.com/astaxie/beego"
|
||
|
"github.com/astaxie/beego/cache"
|
||
|
"github.com/astaxie/beego/context"
|
||
|
"github.com/astaxie/beego/utils"
|
||
|
)
|
||
|
|
||
|
var (
|
||
|
defaultChars = []byte{0, 1, 2, 3, 4, 5, 6, 7, 8, 9}
|
||
|
)
|
||
|
|
||
|
const (
|
||
|
challengeNums = 6
|
||
|
expiration = 600
|
||
|
fieldIdName = "captcha_id"
|
||
|
fieldCaptchaName = "captcha"
|
||
|
cachePrefix = "captcha_"
|
||
|
urlPrefix = "/captcha/"
|
||
|
)
|
||
|
|
||
|
type Captcha struct {
|
||
|
store cache.Cache
|
||
|
urlPrefix string
|
||
|
FieldIdName string
|
||
|
FieldCaptchaName string
|
||
|
StdWidth int
|
||
|
StdHeight int
|
||
|
ChallengeNums int
|
||
|
Expiration int64
|
||
|
CachePrefix string
|
||
|
}
|
||
|
|
||
|
func (c *Captcha) key(id string) string {
|
||
|
return c.CachePrefix + id
|
||
|
}
|
||
|
|
||
|
func (c *Captcha) genRandChars() []byte {
|
||
|
return utils.RandomCreateBytes(c.ChallengeNums, defaultChars...)
|
||
|
}
|
||
|
|
||
|
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 v, ok := c.store.Get(key).([]byte); ok {
|
||
|
chars = v
|
||
|
} else {
|
||
|
ctx.Output.SetStatus(404)
|
||
|
ctx.WriteString("captcha not found")
|
||
|
return
|
||
|
}
|
||
|
|
||
|
// reload captcha
|
||
|
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
|
||
|
}
|
||
|
}
|
||
|
|
||
|
img := NewImage(chars, c.StdWidth, c.StdHeight)
|
||
|
if _, err := img.WriteTo(ctx.ResponseWriter); err != nil {
|
||
|
beego.Error("Write Captcha Image Error:", err)
|
||
|
}
|
||
|
}
|
||
|
|
||
|
func (c *Captcha) CreateCaptchaHtml() template.HTML {
|
||
|
value, err := c.CreateCaptcha()
|
||
|
if err != nil {
|
||
|
beego.Error("Create Captcha Error:", err)
|
||
|
return ""
|
||
|
}
|
||
|
|
||
|
// create html
|
||
|
return template.HTML(fmt.Sprintf(`<input type="hidden" name="%s" value="%s">`+
|
||
|
`<a class="captcha" href="javascript:">`+
|
||
|
`<img onclick="this.src=('%s%s.png?reload='+(new Date()).getTime())" class="captcha-img" src="%s%s.png">`+
|
||
|
`</a>`, c.FieldIdName, value, c.urlPrefix, value, c.urlPrefix, value))
|
||
|
}
|
||
|
|
||
|
func (c *Captcha) CreateCaptcha() (string, error) {
|
||
|
// generate captcha id
|
||
|
id := string(utils.RandomCreateBytes(15))
|
||
|
|
||
|
// get the captcha chars
|
||
|
chars := c.genRandChars()
|
||
|
|
||
|
// save to store
|
||
|
if err := c.store.Put(c.key(id), chars, c.Expiration); err != nil {
|
||
|
return "", err
|
||
|
}
|
||
|
|
||
|
return id, nil
|
||
|
}
|
||
|
|
||
|
func (c *Captcha) VerifyReq(req *http.Request) bool {
|
||
|
req.ParseForm()
|
||
|
return c.Verify(req.Form.Get(c.FieldIdName), req.Form.Get(c.FieldCaptchaName))
|
||
|
}
|
||
|
|
||
|
func (c *Captcha) Verify(id string, challenge string) (success bool) {
|
||
|
if len(challenge) == 0 || len(id) == 0 {
|
||
|
return
|
||
|
}
|
||
|
|
||
|
var chars []byte
|
||
|
|
||
|
key := c.key(id)
|
||
|
|
||
|
if v, ok := c.store.Get(key).([]byte); ok && len(v) == len(challenge) {
|
||
|
chars = v
|
||
|
} else {
|
||
|
return
|
||
|
}
|
||
|
|
||
|
defer func() {
|
||
|
// finally remove it
|
||
|
c.store.Delete(key)
|
||
|
}()
|
||
|
|
||
|
// verify challenge
|
||
|
for i, c := range chars {
|
||
|
if c != challenge[i]-48 {
|
||
|
return
|
||
|
}
|
||
|
}
|
||
|
|
||
|
return true
|
||
|
}
|
||
|
|
||
|
func NewCaptcha(urlPrefix string, store cache.Cache) *Captcha {
|
||
|
cpt := &Captcha{}
|
||
|
cpt.store = store
|
||
|
cpt.FieldIdName = fieldIdName
|
||
|
cpt.FieldCaptchaName = fieldCaptchaName
|
||
|
cpt.ChallengeNums = challengeNums
|
||
|
cpt.Expiration = expiration
|
||
|
cpt.CachePrefix = cachePrefix
|
||
|
cpt.StdWidth = stdWidth
|
||
|
cpt.StdHeight = stdHeight
|
||
|
|
||
|
if len(urlPrefix) == 0 {
|
||
|
urlPrefix = urlPrefix
|
||
|
}
|
||
|
|
||
|
if urlPrefix[len(urlPrefix)-1] != '/' {
|
||
|
urlPrefix += "/"
|
||
|
}
|
||
|
|
||
|
cpt.urlPrefix = urlPrefix
|
||
|
|
||
|
return cpt
|
||
|
}
|
||
|
|
||
|
func NewWithFilter(urlPrefix string, store cache.Cache) *Captcha {
|
||
|
cpt := NewCaptcha(urlPrefix, store)
|
||
|
|
||
|
// create filter for serve captcha image
|
||
|
beego.AddFilter(urlPrefix+":", "BeforeRouter", cpt.Handler)
|
||
|
|
||
|
// add to template func map
|
||
|
beego.AddFuncMap("create_captcha", cpt.CreateCaptchaHtml)
|
||
|
|
||
|
return cpt
|
||
|
}
|