Golang Captcha Verify 验证码支持 纯英文、纯中文、中英混合

captcha

纯数字验证码

大写字母和数字验证码

大小写和数字组合

小写字母加数字

白色背景/无线条(领导要求)

 

添加REDIS支持

 

用法:

 
配置文件 config.ini

[global]
# machine id
expire=10
# startup port
port=8666
# redis config
redisAddr=localhost:6379

用例:

// Copyright 2011 Dmitry Chestnykh. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.

// example of HTTP server that uses the captcha package.
package main

import (
    "encoding/json"
    "fmt"
    "io"
    "log"
    "net/http"
    "strconv"
    "text/template"
    "time"

    "captcha"

    "github.com/zpatrick/go-config"
)

var formTemplate = template.Must(template.New("example").Parse(formTemplateSrc))

func showFormHandler(w http.ResponseWriter, r *http.Request) {
    if r.URL.Path != "/" {
        http.NotFound(w, r)
        return
    }
    d := struct {
        Id string
    }{
        captcha.New(),
    }
    if err := formTemplate.Execute(w, &d); err != nil {
        http.Error(w, err.Error(), http.StatusInternalServerError)
    }
}

func processFormHandler(w http.ResponseWriter, r *http.Request) {
    w.Header().Set("Content-Type", "text/html; charset=utf-8")
    if !captcha.VerifyString(r.FormValue("id"), r.FormValue("captcha")) {
        io.WriteString(w, "Wrong captcha solution! No robots allowed!\n")
    } else {
        io.WriteString(w, "Great job, human! You solved the captcha.\n")
    }
    io.WriteString(w, "<br><a href='/'>Try another one</a>")
}

//获取验证码id, /captcha/{{id}}.png获取到验证码
func getCaptchaFormHandler(w http.ResponseWriter, r *http.Request) {
    lenStr := r.FormValue("len")
    if lenStr == "" {
        d := struct {
            Code int
            Data string
        }{
            0,
            captcha.New(),
        }
        json.NewEncoder(w).Encode(d)
    } else {
        len, err := strconv.Atoi(lenStr)
        if err != nil {
            d := struct {
                Code int
                Data string
            }{
                1,
                "获取验证码id失败",
            }
            json.NewEncoder(w).Encode(d)
            return
        }
        d := struct {
            Code int
            Data string
        }{
            0,
            captcha.NewLen(len),
        }
        json.NewEncoder(w).Encode(d)
    }
}

//验证验证码
func verifyFormHandler(w http.ResponseWriter, r *http.Request) {
    w.Header().Set("Content-Type", "application/json; charset=utf-8")
    if !captcha.VerifyString(r.FormValue("id"), r.FormValue("captcha")) {
        result := struct {
            Code int
            Data string
        }{
            1,
            "验证失败",
        }
        json.NewEncoder(w).Encode(result)
    } else {
        result := struct {
            Code int
            Data string
        }{
            0,
            "验证成功",
        }
        json.NewEncoder(w).Encode(result)
    }
}

func main() {
    iniFile := config.NewINIFile("config.ini")
    c := config.NewConfig([]config.Provider{iniFile})
    if err := c.Load(); err != nil {
        panic("load config error")
    }
    expire, err := c.Int("global.expire")
    if err != nil {
        panic("get expire config error")
    }
    port, err := c.Int("global.port")
    if err != nil {
        panic("get port config error")
    }
    redisAddr, err := c.String("global.redisAddr")
    if err != nil {
        panic("get redisaddr config error")
    }
    captcha.SetCustomStore(captcha.NewRedisStore(redisAddr, "", 0, time.Duration(expire)*time.Minute))
    http.HandleFunc("/", showFormHandler)
    http.HandleFunc("/process", processFormHandler)
    http.HandleFunc("/v1/captcha_id", getCaptchaFormHandler)
    http.HandleFunc("/v1/verify", verifyFormHandler)
    http.Handle("/v1/captcha/", captcha.Server(captcha.StdWidth, captcha.StdHeight))
    fmt.Println("Server is at :" + strconv.Itoa(port))
    if err := http.ListenAndServe(":"+strconv.Itoa(port), nil); err != nil {
        log.Fatal(err)
    }
}

const formTemplateSrc = `<!doctype html>
<head><title>Captcha Example</title></head>
<body>
<script>
function setSrcQuery(e, q) {
    var src  = e.src;
    var p = src.indexOf('?');
    if (p >= 0) {
        src = src.substr(0, p);
    }
    e.src = src + "?" + q
}

function playAudio() {
    var le = document.getElementById("lang");
    var lang = le.options[le.selectedIndex].value;
    var e = document.getElementById('audio')
    setSrcQuery(e, "lang=" + lang)
    e.style.display = 'block';
    e.autoplay = 'true';
    return false;
}

function changeLang() {
    var e = document.getElementById('audio')
    if (e.style.display == 'block') {
        playAudio();
    }
}

function reload() {
    setSrcQuery(document.getElementById('image'), "reload=" + (new Date()).getTime());
    setSrcQuery(document.getElementById('audio'), (new Date()).getTime());
    return false;
}
</script>
<select id="lang" onchange="changeLang()">
<option value="en">English</option>
<option value="ru">Russian</option>
<option value="zh">Chinese</option>
</select>
<form action="/process" method=post>
<p>Type the numbers you see in the picture below:</p>
<p><img id=image src="/captcha/{{.Id}}.png" alt="Captcha image"></p>
<a href="#" onclick="reload()">Reload</a> | <a href="#" onclick="playAudio()">Play Audio</a>
<audio id=audio controls style="display:none" src="/captcha/{{.Id}}.wav" preload=none>
You browser doesn't support audio.
<a href="/captcha/download/{{.Id}}.wav">Download file</a> to play it in the external player.
</audio>
<input type=hidden name=id value="{{.Id}}"><br>
<input name=captcha>
<input type=submit value=Submit>
</form>
`

项目地址:https://github.com/bsed/captcha

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