fix #8

captcha.go

@@ -80,6 +80,7 @@ func (captcha *Captcha) GetKey(length int) (string, error) {
  info := new(CaptchaInfo)
  info.Text = text
  info.CreateTime = time.Now()
+ info.ShownTimes = 0
  rst = captcha.store.Add(info)
  }
  return rst, retErr
@@ -123,6 +124,21 @@ func (captcha *Captcha) GetImage(key string) (image.Image, error) {
  return nil, errors.New("captcha expires")
  }
 
+ if captcha.captchaConfig.ChangeTextOnRefresh {
+ if info.ShownTimes > 0 {
+
+ text, err := captcha.wordManager.Get(len(info.Text))
+ if nil != err {
+ return nil, err
+ } else {
+ info.Text = text
+ }
+ }
+
+ info.ShownTimes++
+ captcha.store.Update(key, info)
+ }
+
  cimg := captcha.genImage(info.Text)
  return cimg, nil
 

captchainfo.go

@@ -14,4 +14,5 @@ import (
 type CaptchaInfo struct {
  Text string
  CreateTime time.Time
+ ShownTimes int
 }

confighelper.go

@@ -48,6 +48,13 @@ func loadConfigFromFile(configFile string) (error, string, *CaptchaConfig, *Imag
 
  captchaConfig.LifeTime = lifeTime
 
+ cfgChangeTextOnRefresh, err := c.Bool("captcha", "change_text_on_refresh")
+ if nil != err {
+ cfgChangeTextOnRefresh = false
+ }
+
+ captchaConfig.ChangeTextOnRefresh = cfgChangeTextOnRefresh
+
  //imageConfig
  imageConfig := new(ImageConfig)
  var fontFiles []string

configtypes.go

@@ -10,8 +10,9 @@ import (
 
 //CaptchaConfig ,the captcha config
 type CaptchaConfig struct {
- LifeTime time.Duration
- CaseSensitive bool
+ LifeTime time.Duration
+ CaseSensitive bool
+ ChangeTextOnRefresh bool
 }
 
 //FilterConfigGroup

samples/gocaptcha-server/.gitignore

@@ -0,0 +1 @@
+gocaptcha-server

samples/gocaptcha-server/gocaptcha.conf

@@ -1,6 +1,7 @@
 [captcha]
 word_dict=../../data/en_char
 life_time=5m
+change_text_on_refresh=true
 
 [service]
 port=80