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golang实现图像验证码的示例代码

作者:林欣快滚去学习

这篇文章主要为大家详细介绍了如何利用golang实现简单的图像验证码,文中的示例代码讲解详细,具有一定的学习价值,感兴趣的小伙伴可以跟随小编一起学习一下

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/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

到此这篇关于golang实现图像验证码的示例代码的文章就介绍到这了,更多相关go图像验证码内容请搜索脚本之家以前的文章或继续浏览下面的相关文章希望大家以后多多支持脚本之家!

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