为什么base64图片 for RESTful 服务

  Data URIs 支持大部分浏览器,IE8之后也支持.小图片使用base64响应对于RESTful服务来说更便捷

安装golang包

go get -u github.com/mojocn/base64Captcha

对于中国大陆Gopher go get golang.org/x/image 失败解决方案:

  mkdir -p $GOPATH/src/golang.org/xcd $GOPATH/src/golang.org/xgit clone https://github.com/golang/image.git

创建图像验证码

import "github.com/mojocn/base64Captcha"
func demoCodeCaptchaCreate() {//config struct for digits//数字验证码配置var configD = base64Captcha.ConfigDigit{Height:     80,Width:      240,MaxSkew:    0.7,DotCount:   80,CaptchaLen: 5,}//config struct for audio//声音验证码配置var configA = base64Captcha.ConfigAudio{CaptchaLen: 6,Language:   "zh",}//config struct for Character//字符,公式,验证码配置var configC = base64Captcha.ConfigCharacter{Height:             60,Width:              240,//const CaptchaModeNumber:数字,CaptchaModeAlphabet:字母,CaptchaModeArithmetic:算术,CaptchaModeNumberAlphabet:数字字母混合.Mode:               base64Captcha.CaptchaModeNumber,ComplexOfNoiseText: base64Captcha.CaptchaComplexLower,ComplexOfNoiseDot:  base64Captcha.CaptchaComplexLower,IsShowHollowLine:   false,IsShowNoiseDot:     false,IsShowNoiseText:    false,IsShowSlimeLine:    false,IsShowSineLine:     false,CaptchaLen:         6,}//创建声音验证码//GenerateCaptcha 第一个参数为空字符串,包会自动在服务器一个随机种子给你产生随机uiid.idKeyA, capA := base64Captcha.GenerateCaptcha("", configA)//以base64编码base64stringA := base64Captcha.CaptchaWriteToBase64Encoding(capA)//创建字符公式验证码.//GenerateCaptcha 第一个参数为空字符串,包会自动在服务器一个随机种子给你产生随机uiid.idKeyC, capC := base64Captcha.GenerateCaptcha("", configC)//以base64编码base64stringC := base64Captcha.CaptchaWriteToBase64Encoding(capC)//创建数字验证码.//GenerateCaptcha 第一个参数为空字符串,包会自动在服务器一个随机种子给你产生随机uiid.idKeyD, capD := base64Captcha.GenerateCaptcha("", configD)//以base64编码base64stringD := base64Captcha.CaptchaWriteToBase64Encoding(capD)fmt.Println(idKeyA, base64stringA, "\n")fmt.Println(idKeyC, base64stringC, "\n")fmt.Println(idKeyD, base64stringD, "\n")
}

验证图像验证码

import "github.com/mojocn/base64Captcha"
func verfiyCaptcha(idkey,verifyValue string){verifyResult := base64Captcha.VerifyCaptcha(idkey, verifyValue)if verifyResult {//success} else {//fail}
}

使用golang搭建API服务 main.go

// example of HTTP server that uses the captcha package.
package mainimport ("encoding/json""fmt""github.com/mojocn/base64Captcha""log""net/http"
)//ConfigJsonBody json request body.
type ConfigJsonBody struct {Id              stringCaptchaType     stringVerifyValue     stringConfigAudio     base64Captcha.ConfigAudioConfigCharacter base64Captcha.ConfigCharacterConfigDigit     base64Captcha.ConfigDigit
}// base64Captcha create http handler
func generateCaptchaHandler(w http.ResponseWriter, r *http.Request) {//parse request parameters//接收客户端发送来的请求参数decoder := json.NewDecoder(r.Body)var postParameters ConfigJsonBodyerr := decoder.Decode(&postParameters)if err != nil {log.Println(err)}defer r.Body.Close()//create base64 encoding captcha//创建base64图像验证码var config interface{}switch postParameters.CaptchaType {case "audio":config = postParameters.ConfigAudiocase "character":config = postParameters.ConfigCharacterdefault:config = postParameters.ConfigDigit}//GenerateCaptcha 第一个参数为空字符串,包会自动在服务器一个随机种子给你产生随机uiid.captchaId, digitCap := base64Captcha.GenerateCaptcha(postParameters.Id, config)base64Png := base64Captcha.CaptchaWriteToBase64Encoding(digitCap)//or you can do this//你也可以是用默认参数 生成图像验证码//base64Png := captcha.GenerateCaptchaPngBase64StringDefault(captchaId)//set json response//设置json响应w.Header().Set("Content-Type", "application/json; charset=utf-8")body := map[string]interface{}{"code": 1, "data": base64Png, "captchaId": captchaId, "msg": "success"}json.NewEncoder(w).Encode(body)
}
// base64Captcha verify http handler
func captchaVerifyHandle(w http.ResponseWriter, r *http.Request) {//parse request parameters//接收客户端发送来的请求参数decoder := json.NewDecoder(r.Body)var postParameters ConfigJsonBodyerr := decoder.Decode(&postParameters)if err != nil {log.Println(err)}defer r.Body.Close()//verify the captcha//比较图像验证码verifyResult := base64Captcha.VerifyCaptcha(postParameters.Id, postParameters.VerifyValue)//set json response//设置json响应w.Header().Set("Content-Type", "application/json; charset=utf-8")body := map[string]interface{}{"code": "error", "data": "验证失败", "msg": "captcha failed"}if verifyResult {body = map[string]interface{}{"code": "success", "data": "验证通过", "msg": "captcha verified"}}json.NewEncoder(w).Encode(body)
}//start a net/http server
//启动golang net/http 服务器
func main() {//serve Vuejs+ElementUI+Axios Web Applicationhttp.Handle("/", http.FileServer(http.Dir("./static")))//api for create captcha//创建图像验证码apihttp.HandleFunc("/api/getCaptcha", generateCaptchaHandler)//api for verify captchahttp.HandleFunc("/api/verifyCaptcha", captchaVerifyHandle)fmt.Println("Server is at localhost:3333")if err := http.ListenAndServe("localhost:3333", nil); err != nil {log.Fatal(err)}
}

运行demo代码

cd $GOPATH/src/github.com/mojocn/captcha/examples
go run main.go