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golang包快速生成base64验证码的方法

2020年06月23日  | 移动技术网IT编程  | 我要评论

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

在线demo playground powered by vuejs+elementui+axios

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

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