golang 图像验证码

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

github在线Demo Playground Powered by Vuejs+elementUI+Axios

wav file

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/x
    cd $GOPATH/src/golang.org/x
    git 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 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
}

// 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 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
    }
    //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 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
    //创建图像验证码api
    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/examples
go run main.go

（编辑：李大同）

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