captchas

Captchas

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

Usage

Preview: http://129.204.189.159:10000/.

$ cd example
$ go run main.go

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
• redis
• memcached
• add your store here by PR or request a new store.

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.
)