使用Go语言实现图像验证码功能

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

// 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

作者：trytv