go语言验证码合集包，支持中英文复杂验证码，自定义字体！快速构建，免费开源

//++++++++++++++++++++++++++++++++++++++++ //Fighting for great,share generate value! //Build the best soft by golang,let's go! //++++++++++++++++++++++++++++++++++++++++ //Author:ShirDon <http://www.shirdon.com> //Email:[email protected]; [email protected] //++++++++++++++++++++++++++++++++++++++++ package captchas_with_go import ( "errors" "image" "strings" "time" ) //Captcha is the core captcha struct type Captcha struct { store StoreInterface wordManager *WordManager filterManager *ImageFilterManager captchaConfig *CaptchaConfig imageConfig *ImageConfig filterConfig *FilterConfig storeConfig *StoreConfig } //CreateCaptcha is a method to create new Captcha struct func CreateCaptcha(wordManager *WordManager, captchaConfig *CaptchaConfig, imageConfig *ImageConfig, filterConfig *FilterConfig, storeConfig *StoreConfig) (*Captcha, error) { var retErr error captcha := new(Captcha) store, err := createStore(storeConfig) if nil == err { captcha.store = store } else { retErr = err } if nil != wordManager { captcha.wordManager = wordManager } else { retErr = errors.New("CreateCaptcha fail:invalid wordManager") } captcha.captchaConfig = captchaConfig captcha.imageConfig = imageConfig captcha.filterConfig = filterConfig captcha.filterManager = CreateImageFilterManagerByConfig(filterConfig) return captcha, retErr } //CreateCaptchaFromConfigFile is a method to create new Captcha struct func CreateCaptchaFromConfigFile(configFile string) (*Captcha, error) { var captcha *Captcha var retErr error err, wordDict, captchaConfig, imageConfig, filterConfig, storeConfig := loadConfigFromFile(configFile) if nil == err { wordmgr, err := CreateWordManagerFromDataFile(wordDict) if nil == err { captcha, retErr = CreateCaptcha(wordmgr, captchaConfig, imageConfig, filterConfig, storeConfig) } else { retErr = err } } else { retErr = err } return captcha, retErr } //GetKey will generate a key with required length func (captcha *Captcha) GetKey(length int) (string, error) { var retErr error var rst string text, err := captcha.wordManager.Get(length) if nil != err { retErr = err } else { info := new(CaptchaInfo) info.Text = text info.CreateTime = time.Now() info.ShownTimes = 0 rst = captcha.store.Add(info) } return rst, retErr } //Verify will verify the user's input and the server stored captcha text func (captcha *Captcha) Verify(key, textToVerify string) (bool, string) { info := captcha.store.Get(key) if nil == info { return false, "captcha info not found" } if info.CreateTime.Add(captcha.captchaConfig.LifeTime).Before(time.Now()) { return false, "captcha expires" } verified := false if captcha.captchaConfig.CaseSensitive { verified = info.Text == textToVerify } else { verified = strings.ToLower(info.Text) == strings.ToLower(textToVerify) } if !verified { return false, "captcha text not match" } captcha.store.Del(key) return true, "" } //GetImage will generate the binary image data func (captcha *Captcha) GetImage(key string) (image.Image, error) { info := captcha.store.Get(key) if nil == info { return nil, errors.New("captcha info not found") } if info.CreateTime.Add(captcha.captchaConfig.LifeTime).Before(time.Now()) { 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 } func createStore(config *StoreConfig) (StoreInterface, error) { var store StoreInterface var err error switch config.Engine { case STORE_ENGINE_BUILDIN: store = CreateCStore(config.LifeTime, config.GcProbability, config.GcDivisor) break case STORE_ENGINE_MEMCACHE: store = CreateMCStore(config.LifeTime, config.Servers) break default: creator, has := storeCreators[config.Engine] if !has { err = errors.New("Not supported engine:'" + config.Engine + "'") break } store, err = creator(config) } return store, err } func (captcha *Captcha) genImage(text string) *CImage { cimg := CreateCImage(captcha.imageConfig) cimg.drawString(text) for _, filter := range captcha.filterManager.GetFilters() { filter.Proc(cimg) } return cimg }