Base64captcha 几行代码就可以定义自己内容的图形验证码库,支持任意unicode字符的内容. 原文地址 https://mojotv.cn/go/refactor-base64-captcha
1. 文档&Demo
- English
- 中文文档
- Playground
2. 快速上手
2.1 下载base64Captcha包
go get -u github.com/mojocn/base64Captcha
2.2 在你的项目中使用base64Captcha
2.2.1 实现Store interface 或者使用自带memory store
- Build-in Memory Store(只支持单机部署,多台服务器请自定义redis store)
type Store interface {
// Set sets the digits for the captcha id.
Set(id string, value string)
// Get returns stored digits for the captcha id. Clear indicates
// whether the captcha must be deleted from the store.
Get(id string, clear bool) string
//Verify captcha's answer directly
Verify(id, answer string, clear bool) bool
}
2.2.2 实现Driver interface 或者使用自带 drivers
包自带driver:
- Driver Digit
- Driver String
- Driver Math
- Driver Chinese
// Driver captcha interface for captcha engine to to write staff
type Driver interface {
//DrawCaptcha draws binary item
DrawCaptcha(content string) (item Item, err error)
//GenerateIdQuestionAnswer creates rand id, content and answer
GenerateIdQuestionAnswer() (id, q, a string)
}
2.2.3 核心代码captcha.go
captcha.go 是package的入口文件,源代码逻辑非常简单,如下:
func init() {
//init rand seed
rand.Seed(time.Now().UnixNano())
}
// Captcha captcha basic information.
type Captcha struct {
Driver Driver
Store Store
}
func NewCaptcha(driver Driver, store Store) *Captcha {
return &Captcha{Driver: driver, Store: store}
}
//Generate generates a random id, base64 image string or an error if any
func (c *Captcha) Generate() (id, b64s string, err error) {
id,content, answer := c.Driver.GenerateIdQuestionAnswer()
item, err := c.Driver.DrawCaptcha(content)
if err != nil {
return "", "", err
}
c.Store.Set(id, answer)
b64s = item.EncodeB64string()
return
}
//if you has multiple captcha instances which shares a same store. You may want to use `store.Verify` method instead.
//Verify by given id key and remove the captcha value in store, return boolean value.
func (c *Captcha) Verify(id, answer string, clear bool) (match bool) {
match = c.Store.Get(id, clear) == answer
return
}
2.2.4 生成Base64(image/audio)验证码字符串
//Generate generates a random id, base64 image string or an error if any
func (c *Captcha) Generate() (id, b64s string, err error) {
id,content, answer := c.Driver.GenerateIdQuestionAnswer()
item, err := c.Driver.DrawCaptcha(content)
if err != nil {
return "", "", err
}
c.Store.Set(id, answer)
b64s = item.EncodeB64string()
return
}
2.2.5 校验验证码内容
//if you has multiple captcha instances which shares a same store. You may want to use `store.Verify` method instead.
//Verify by given id key and remove the captcha value in store, return boolean value.
func (c *Captcha) Verify(id, answer string, clear bool) (match bool) {
match = c.Store.Get(id, clear) == answer
return
}
2.2.6 完整实例代码
// 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
DriverAudio *base64Captcha.DriverAudio
DriverString *base64Captcha.DriverString
DriverChinese *base64Captcha.DriverChinese
DriverMath *base64Captcha.DriverMath
DriverDigit *base64Captcha.DriverDigit
}
var store = base64Captcha.DefaultMemStore
// base64Captcha create http handler
func generateCaptchaHandler(w http.ResponseWriter, r *http.Request) {
//parse request parameters
decoder := json.NewDecoder(r.Body)
var param configJsonBody
err := decoder.Decode(¶m)
if err != nil {
log.Println(err)
}
defer r.Body.Close()
var driver base64Captcha.Driver
//create base64 encoding captcha
switch param.CaptchaType {
case "audio":
driver = param.DriverAudio
case "string":
driver = param.DriverString.ConvertFonts()
case "math":
driver = param.DriverMath.ConvertFonts()
case "chinese":
driver = param.DriverChinese.ConvertFonts()
default:
driver = param.DriverDigit
}
c := base64Captcha.NewCaptcha(driver, store)
id, b64s, err := c.Generate()
body := map[string]interface{}{"code": 1, "data": b64s, "captchaId": id, "msg": "success"}
if err != nil {
body = map[string]interface{}{"code": 0, "msg": err.Error()}
}
w.Header().Set("Content-Type", "application/json; charset=utf-8")
json.NewEncoder(w).Encode(body)
}
// base64Captcha verify http handler
func captchaVerifyHandle(w http.ResponseWriter, r *http.Request) {
//parse request json body
decoder := json.NewDecoder(r.Body)
var param configJsonBody
err := decoder.Decode(¶m)
if err != nil {
log.Println(err)
}
defer r.Body.Close()
//verify the captcha
body := map[string]interface{}{"code": 0, "msg": "failed"}
if store.Verify(param.Id, param.VerifyValue, true) {
body = map[string]interface{}{"code": 1, "msg": "ok"}
}
//set json response
w.Header().Set("Content-Type", "application/json; charset=utf-8")
json.NewEncoder(w).Encode(body)
}
//start a net/http server
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 :8777")
if err := http.ListenAndServe(":8777", nil); err != nil {
log.Fatal(err)
}
}
2.3 使用历史版本
v1.2.2
go get github.com/mojocn/[email protected]
3. 定制自己的图形验证码
你那个定制自己的图形验码内容,只需实现 interface driver 和 interface item.
下面是几个可以参考的driver实现示例:
- DriverMath
- DriverChinese
- ItemChar
你甚至可以设计captcha struct成你想要的功能
4. 致谢
- dchest/captha
- @slayercat
- @amzyang
- @Luckyboys
5. Licence
base64Captcha source code is licensed under the Apache Licence, Version 2.0
(http://www.apache.org/licenses/LICENSE-2.0.html).