Go Base64 验证码管理器

栏目: IT技术 · 发布时间: 5年前

内容简介：Base64 Captchas Manager, supports multiple(digit, math, audio, string, chinese etc.) and(memory, redis, memcached etc.).Preview:

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.
)

以上所述就是小编给大家介绍的《Go Base64 验证码管理器》，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对码农网的支持！

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