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
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 demo code CaptchaCreate() {
//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
Decode r := 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
