Go Base64 验证码管理器

摘要：package main import ( "encoding/json" "fmt" "io" "log" "net/http" "text/template" "github.com/clevergo/captchas" "github.com/clevergo/captchas/drivers" "github.com/clevergo/captchas/memstore" ) var ( store = memstore.New() // memory store. driver = drivers.NewDigit() // digit driver. manager = captchas.New(store, driver) // manager tmpl = template.Must(template.New("captcha").Parse(`

`)) ) func main() { http.HandleFunc("/generate", generate) http.HandleFunc("/validate", validate) log.Println(http.ListenAndServe(":8080", http.DefaultServeMux)) } // generates a new captcha func generate(w http.ResponseWriter, r *http.Request) { captcha, err := manager.Generate() if err。Base64 Captchas Manager, supports multiple(digit, math, audio, string, chinese etc.) and(memory, redis, memcached etc.).。

Captchas

Base64 Captchas Manager, supports multiple(digit, math, audio, string, chinese etc.) and(memory, redis, memcached etc.).

Usage

Preview: http://129.204.189.159:10000/ .

$ cd example
$ go run main.go

Quick Start

package main

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

	"github.com/clevergo/captchas"
	"github.com/clevergo/captchas/drivers"
	"github.com/clevergo/captchas/memstore"
)

var (
	store   = memstore.New()              // memory store.
	driver  = drivers.NewDigit()          // digit driver.
	manager = captchas.New(store, driver) // manager
	tmpl    = template.Must(template.New("captcha").Parse(`
<html>
<body>
<form action="/validate" method="POST">
	<input name="captcha">
	{{ .captcha.HTMLField "captcha_id" }}
	<input type="submit" value="Submit">
</form>
</body>
</html>
	`))
)

func main() {
	http.HandleFunc("/generate", generate)
	http.HandleFunc("/validate", validate)
	log.Println(http.ListenAndServe(":8080", http.DefaultServeMux))
}

// generates a new captcha
func generate(w http.ResponseWriter, r *http.Request) {
	captcha, err := manager.Generate()
	if err != nil {
		http.Error(w, err.Error(), 500)
                return
	}

	// returns JSON data.
	if r.URL.Query().Get("format") == "json" {
		v := map[string]string{
			"captcha_id":   captcha.ID(),             // captcha ID.
			"captcha_data": captcha.EncodeToString(), // base64 encode string.
		}
		data, _ := json.Marshal(v)
		w.Write(data)
		return
	}

	// render captcha via template.
	tmpl.Execute(w, map[string]interface{}{
		"captcha": captcha,
	})

}

// validates a captcha.
func validate(w http.ResponseWriter, r *http.Request) {
	captchaID := r.PostFormValue("captcha_id")
	captcha := r.PostFormValue("captcha")

	// verify
	if err := manager.Verify(captchaID, captcha, true); err != nil {
		io.WriteString(w, fmt.Sprintf("captcha is invalid: %s", err.Error()))
		return
	}

	io.WriteString(w, "valid")
}

Drivers

import "github.com/clevergo/captchas/drivers"

Digit

// all options are optional.
opts := []drivers.DigitOption{
	drivers.DigitHeight(50),
	drivers.DigitWidth(120),
	drivers.DigitLength(6),
	drivers.DigitMaxSkew(0.8),
	drivers.DigitDotCount(80),
}
driver := drivers.NewDigit(opts...)

Audio

// all options are optional.
opts := []drivers.AudioOption{
	drivers.AudioLangauge("en"),
	drivers.AudioLength(6),
}
driver := drivers.NewAudio(opts...)

Math

// all options are optional.
opts := []drivers.MathOption{
	drivers.MathHeight(50),
	drivers.MathWidth(120),
	drivers.MathNoiseCount(0),
	drivers.MathFonts([]string{}),
	drivers.MathBGColor(&color.RGBA{}),
}
driver := drivers.NewMath(opts...)

String

// all options are optional.
opts := []drivers.StringOption{
	drivers.StringHeight(50),
	drivers.StringWidth(120),
	drivers.StringLength(4),
	drivers.StringNoiseCount(0),
	drivers.StringFonts([]string{}),
	drivers.StringSource("abcdefghijklmnopqrstuvwxyz"),
	drivers.StringBGColor(&color.RGBA{}),
}
driver := drivers.NewString(opts...)

Chinese

// all options are optional.
opts := []drivers.ChineseOption{
	drivers.ChineseHeight(50),
	drivers.ChineseWidth(120),
	drivers.ChineseLength(4),
	drivers.ChineseNoiseCount(0),
	drivers.ChineseFonts([]string{"wqy-microhei.ttc"}),
	drivers.ChineseSource("零一二三四五六七八九十"),
	drivers.ChineseBGColor(&color.RGBA{}),
}
driver := drivers.NewChinese(opts...)

Stores

Memory

import "github.com/clevergo/captchas/memstore"

store := memstore.New(
	memstore.Expiration(10*time.Minute), // captcha expiration, optional.
	memstore.GCInterval(time.Minute), // garbage collection interval to delete expired captcha, optional.
)

Inspired by scs.memstore .

Redis

import (
    "github.com/clevergo/captchas/redisstore"
    "github.com/go-redis/redis/v7"
)

// redis client.
client := redis.NewClient(&redis.Options{
	Addr: "localhost:6379",
})
store := redisstore.New(
	client,
	redisstore.Expiration(expiration), // captcha expiration, optional.
	redisstore.Prefix("caotchas"), // redis key prefix, optional.
)

Memcached

import (
	"github.com/bradfitz/gomemcache/memcache"
	"github.com/clevergo/captchas/memcachedstore"
)

// client.
client := memcache.New("localhost:11211")
store := memcachedstore.New(
	client,
	memcachedstore.Expiration(int32(600)), // captcha expiration, optional.
	memcachedstore.Prefix("captchas"),     // key prefix, optional.
)