golang包快速生成base64验证码的方法

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base64Captcha快速生成base64编码图片验证码字符串

支持多种样式,算术,数字,字母,混合模式,语音模式.

Base64是网络上最常见的用于传输8Bit字节代码的编码方式之一。Base64编码可用于在HTTP环境下传递较长的标识信息, 直接把base64当成是字符串方式的数据就好了

减少了http请求；数据就是图片；

为APIs微服务而设计

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
godoc文档

在线Demo Playground Powered by Vuejs+elementUI+Axios

安装golang包

go get -u github.com/mojocn/base64Captcha

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,  }  //create a audio captcha.  idKeyA, capA := base64Captcha.GenerateCaptcha("", configA)  //以base64编码  base64stringA := base64Captcha.CaptchaWriteToBase64Encoding(capA)  //create a characters captcha.  idKeyC, capC := base64Captcha.GenerateCaptcha("", configC)  //以base64编码  base64stringC := base64Captcha.CaptchaWriteToBase64Encoding(capC)  //create a digits captcha.  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

// example of HTTP server that uses the captcha package.package main import (  "encoding/json"  "fmt"  "github.com/mojocn/base64Captcha"  "log"  "net/http") //ConfigJsonBody json request body.type ConfigJsonBody struct {  Id       string  CaptchaType   string  VerifyValue   string  ConfigAudio   base64Captcha.ConfigAudio  ConfigCharacter base64Captcha.ConfigCharacter  ConfigDigit   base64Captcha.ConfigDigit} var configC = base64Captcha.ConfigCharacter{  Height:       60,  Width:       240,  Mode:        0,  ComplexOfNoiseText: 0,  ComplexOfNoiseDot: 0,  IsShowHollowLine:  false,  IsShowNoiseDot:   false,  IsShowNoiseText:  false,  IsShowSlimeLine:  false,  IsShowSineLine:   false,  CaptchaLen:     6,}  // base64Captcha create http handlerfunc 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 ConfigJsonBody  err := 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.ConfigAudio  case "character":    config = postParameters.ConfigCharacter  default:    config = postParameters.ConfigDigit  }  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 handlerfunc 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 ConfigJsonBody  err := 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 Application  http.Handle("/", http.FileServer(http.Dir("./static")))   //api for create captcha  http.HandleFunc("/api/getCaptcha", generateCaptchaHandler)   //api for verify captcha  http.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/examplesgo run main.go

访问 http://localhost:777

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