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golang包快速生成base64验证码

2020-06-09 18:42:19 admin 883

# 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](https://link.jianshu.com?t=https%3A%2F%2Fgodoc.org%2Fgithub.com%2Fmojocn%2Fbase64Captcha)

#### 在线Demo [Playground Powered by
Vuejs+elementUI+Axios](https://link.jianshu.com?t=http%3A%2F%2Fcaptcha.mojotv.cn)

[](https://link.jianshu.com?t=http%3A%2F%2Fcaptcha.mojotv.cn%2F)

<img src='/static/upload/bigpic/20200608/1643360-4571554240818fe5.png' />

[Playground](https://link.jianshu.com?t=http%3A%2F%2Fcaptcha.mojotv.cn%2F)

[ <img src='/static/upload/bigpic/20200608/1643360-55219ea15e2b0747.png' /> 28+58=?.png
](https://link.jianshu.com?t=http%3A%2F%2Fcaptcha.mojotv.cn%2F)  
[ <img src='/static/upload/bigpic/20200608/1643360-b15252d4b2deb037.png' /> ACNRfd.png
](https://link.jianshu.com?t=http%3A%2F%2Fcaptcha.mojotv.cn%2F)  
[ rW4npZ.png ](https://link.jianshu.com?t=http%3A%2F%2Fcaptcha.mojotv.cn%2F)  
[wav
file](https://link.jianshu.com?t=https%3A%2F%2Fraw.githubusercontent.com%2Fmojocn%2Fbase64Captcha%2Fmaster%2Fexamples%2Fstatic%2F1lNMVxfysfSQJXvjR1LX.wav)

### 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 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
        }
        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
        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

#### 访问 `http://localhost:777`

如果喜欢,请star 非常感谢.

## License

base64Captcha source code is licensed under the Apache Licence, Version 2.0  
([http://www.apache.org/licenses/LICENSE-2.0.html](https://link.jianshu.com?t=http%3A%2F%2Fwww.apache.org%2Flicenses%2FLICENSE-2.0.html)).

转载文章，原文链接： golang包快速生成base64验证码

关键字词golang base

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