base64Captcha

package module
Version: v1.3.5 Latest Latest
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Published: Jul 19, 2021 License: Apache-2.0 Imports: 24 Imported by: 119

README ¶

A flexible and various captcha package

Test Go Report Card GoDoc Build Status codecov stability-stable Foundation

Base64captcha supports any unicode character and can easily be customized to support Math Chinese Korean Japanese Russian Arabic etc.

1. 📖📖📖 Doc & Demo

2. 🚀🚀🚀 Quick start

2.1 🎬🎬🎬 Use history version

Tag v1.2.2

go get github.com/mojocn/base64Captcha@v1.2.2

or edit your go.mod file to

github.com/mojocn/base64Captcha@v1.2.2

2.2 📥📥📥 Download package
go get -u github.com/mojocn/base64Captcha

For Gopher from mainland China without VPN go get golang.org/x/image failure solution:

  • go version > 1.11
  • set env GOPROXY=https://goproxy.io
2.3 🏂🏂🏂 How to code with base64Captcha
2.3.1 🏇🏇🏇 Implement Store interface or use build-in memory 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
}

2.3.2 🏄🏄🏄 Implement Driver interface or use one of build-in drivers

There are some build-in drivers:

  1. Build-in Driver Digit
  2. Build-in Driver String
  3. Build-in Driver Math
  4. Build-in 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)
}
2.3.3 🚴🚴🚴 ‍Core code captcha.go

captcha.go is the entry of base64Captcha which is quite simple.

package base64Captcha

import (
	"math/rand"
	"time"
)

func init() {
	//init rand seed
	rand.Seed(time.Now().UnixNano())
}

// Captcha captcha basic information.
type Captcha struct {
	Driver Driver
	Store  Store
}

//NewCaptcha creates a captcha instance from driver and 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
}

//Verify by a given id key and remove the captcha value in store,
//return boolean value.
//if you has multiple captcha instances which share a same store.
//You may want to call `store.Verify` method instead.
func (c *Captcha) Verify(id, answer string, clear bool) (match bool) {
	match = c.Store.Get(id, clear) == answer
	return
}

2.3.4 🚵🚵🚵 ‍Generate Base64(image/audio) string
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
}
2.3.5 🤸🤸🤸 Verify Answer
//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
}
2.3.6 🏃🏃🏃 ‍Full Example
// 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(&param)
	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(&param)
	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)
	}
}
2.3.7 Example Use Etcd as store

captcha with etcd database as store

3. 🎨🎨🎨 Customization

You can customize your captcha display image by implementing interface driver and interface item.

There are some example for your reference.

  1. DriverMath
  2. DriverChinese
  3. ItemChar

You can even design the captcha struct to whatever you prefer.

4. 💖💖💖 Thanks

5. 🍭🍭🍭 Licence

base64Captcha source code is licensed under the Apache Licence, Version 2.0 (http://www.apache.org/licenses/LICENSE-2.0.html).

Documentation ¶

Overview ¶

Package base64Captcha supports digits, numbers,alphabet, arithmetic, audio and digit-alphabet captcha. base64Captcha is used for fast development of RESTful APIs, web apps and backend services in Go. give a string identifier to the package and it returns with a base64-encoding-png-string

Index ¶

Constants ¶

View Source
const (

	//TxtNumbers chacters for numbers.
	TxtNumbers = "012346789"
	//TxtAlphabet characters for alphabet.
	TxtAlphabet = "ABCDEFGHJKMNOQRSTUVXYZabcdefghjkmnoqrstuvxyz"
	//TxtSimpleCharaters simple numbers and alphabet
	TxtSimpleCharaters = "13467ertyiadfhjkxcvbnERTYADFGHJKXCVBN"
	//TxtChineseCharaters makes characters in chinese
	TxtChineseCharaters = "的一是在不了有和人这中大为上个国我以要他" +
		"时来用们生到作地于出就分对成会可主发年动" +
		"同工也能下过子说产种面而方后多定行学法所" +
		"民得经十三之进着等部度家电力里如水化高自" +
		"二理起小物现实加量都两体制机当使点从业本" +
		"去把性好应开它合还因由其些然前外天政四日" +
		"那社义事平形相全表间样与关各重新线内数正" +
		"心反你明看原又么利比或但质气第向道命此变" +
		"条只没结解问意建月公无系军很情者最立代想" +
		"已通并提直题党程展五果料象员革位入常文总" +
		"次品式活设及管特件长求老头基资边流路级少" +
		"图山统接知较将组见计别她手角期根论运农指" +
		"几九区强放决西被干做必战先回则任取据处队" +
		"南给色光门即保治北造百规热领七海口东导器" +
		"压志世金增争济阶油思术极交受联什认六共权" +
		"收证改清己美再采转更单风切打白教速花带安" +
		"场身车例真务具万每目至达走积示议声报斗完" +
		"类八离华名确才科张信马节话米整空元况今集" +
		"温传土许步群广石记需段研界拉林律叫且究观" +
		"越织装影算低持音众书布复容儿须际商非验连" +
		"断深难近矿千周委素技备半办青省列习响约支" +
		"般史感劳便团往酸历市克何除消构府称太准精" +
		"值号率族维划选标写存候毛亲快效斯院查江型" +
		"眼王按格养易置派层片始却专状育厂京识适属" +
		"圆包火住调满县局照参红细引听该铁价严龙飞"

	//MimeTypeAudio output base64 mine-type.
	MimeTypeAudio = "audio/wav"
	//MimeTypeImage output base64 mine-type.
	MimeTypeImage = "image/png"
	//Emoji is a source string for randTxt
	Emoji = "" /* 268-byte string literal not displayed */
)
View Source
const (
	//OptionShowHollowLine shows hollow line
	OptionShowHollowLine = 2
	//OptionShowSlimeLine shows slime line
	OptionShowSlimeLine = 4
	//OptionShowSineLine shows sine line
	OptionShowSineLine = 8
)

Variables ¶

View Source
var (
	// GCLimitNumber The number of captchas created that triggers garbage collection used by default store.
	GCLimitNumber = 10240
	// Expiration time of captchas used by default store.
	Expiration = 10 * time.Minute
	// DefaultMemStore is a shared storage for captchas, generated by New function.
	DefaultMemStore = NewMemoryStore(GCLimitNumber, Expiration)
)
View Source
var DefaultDriverAudio = NewDriverAudio(6, "en")

DefaultDriverAudio is a default audio driver

View Source
var DefaultDriverDigit = NewDriverDigit(80, 240, 5, 0.7, 80)

DefaultDriverDigit is a default driver of digit

View Source
var DefaultEmbeddedFonts = NewEmbeddedFontsStorage(defaultEmbeddedFontsFS)

Functions ¶

func RandColor ¶

func RandColor() color.RGBA

RandColor get random color. 生成随机颜色.

func RandDeepColor ¶

func RandDeepColor() color.RGBA

RandDeepColor get random deep color. 随机生成深色系.

func RandLightColor ¶

func RandLightColor() color.RGBA

RandLightColor get random ligth color. 随机生成浅色.

func RandText ¶

func RandText(size int, sourceChars string) string

RandText creates random text of given size.

func RandomId ¶

func RandomId() string

RandomId returns a new random id key string.

Types ¶

type Captcha ¶

type Captcha struct {
	Driver Driver
	Store  Store
}

Captcha captcha basic information.

func NewCaptcha ¶

func NewCaptcha(driver Driver, store Store) *Captcha

NewCaptcha creates a captcha instance from driver and store

func (*Captcha) Generate ¶

func (c *Captcha) Generate() (id, b64s string, err error)

Generate generates a random id, base64 image string or an error if any

func (*Captcha) Verify ¶

func (c *Captcha) Verify(id, answer string, clear bool) (match bool)

Verify by a given id key and remove the captcha value in store, return boolean value. if you has multiple captcha instances which share a same store. You may want to call `store.Verify` method instead.

type Driver ¶

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)
}

Driver captcha interface for captcha engine to to write staff

type DriverAudio ¶

type DriverAudio struct {
	// Length Default number of digits in captcha solution.
	Length int
	// Language possible values for lang are "en", "ja", "ru", "zh".
	Language string
}

DriverAudio captcha config for captcha-engine-audio.

func NewDriverAudio ¶

func NewDriverAudio(length int, language string) *DriverAudio

NewDriverAudio creates a driver of audio

func (*DriverAudio) DrawCaptcha ¶

func (d *DriverAudio) DrawCaptcha(content string) (item Item, err error)

DrawCaptcha creates audio captcha item

func (*DriverAudio) GenerateIdQuestionAnswer ¶

func (d *DriverAudio) GenerateIdQuestionAnswer() (id, q, a string)

GenerateIdQuestionAnswer creates id,captcha content and answer

type DriverChinese ¶

type DriverChinese struct {
	//Height png height in pixel.
	Height int
	//Width Captcha png width in pixel.
	Width int

	//NoiseCount text noise count.
	NoiseCount int

	//ShowLineOptions := OptionShowHollowLine | OptionShowSlimeLine | OptionShowSineLine .
	ShowLineOptions int

	//Length random string length.
	Length int

	//Source is a unicode which is the rand string from.
	Source string

	//BgColor captcha image background color (optional)
	BgColor *color.RGBA

	//Fonts loads by name see fonts.go's comment
	Fonts []string
	// contains filtered or unexported fields
}

DriverChinese is a driver of unicode Chinese characters.

func NewDriverChinese ¶

func NewDriverChinese(height int, width int, noiseCount int, showLineOptions int, length int, source string, bgColor *color.RGBA, fontsStorage FontsStorage, fonts []string) *DriverChinese

NewDriverChinese creates a driver of Chinese characters

func (*DriverChinese) ConvertFonts ¶

func (d *DriverChinese) ConvertFonts() *DriverChinese

ConvertFonts loads fonts by names

func (*DriverChinese) DrawCaptcha ¶

func (d *DriverChinese) DrawCaptcha(content string) (item Item, err error)

DrawCaptcha generates captcha item(image)

func (*DriverChinese) GenerateIdQuestionAnswer ¶

func (d *DriverChinese) GenerateIdQuestionAnswer() (id, content, answer string)

GenerateIdQuestionAnswer generates captcha content and its answer

type DriverDigit ¶

type DriverDigit struct {
	// Height png height in pixel.
	Height int
	// Width Captcha png width in pixel.
	Width int
	// DefaultLen Default number of digits in captcha solution.
	Length int
	// MaxSkew max absolute skew factor of a single digit.
	MaxSkew float64
	// DotCount Number of background circles.
	DotCount int
}

DriverDigit config for captcha-engine-digit.

func NewDriverDigit ¶

func NewDriverDigit(height int, width int, length int, maxSkew float64, dotCount int) *DriverDigit

NewDriverDigit creates a driver of digit

func (*DriverDigit) DrawCaptcha ¶

func (d *DriverDigit) DrawCaptcha(content string) (item Item, err error)

DrawCaptcha creates digit captcha item

func (*DriverDigit) GenerateIdQuestionAnswer ¶

func (d *DriverDigit) GenerateIdQuestionAnswer() (id, q, a string)

GenerateIdQuestionAnswer creates captcha content and answer

type DriverLanguage ¶

type DriverLanguage struct {
	// Height png height in pixel.
	Height int
	// Width Captcha png width in pixel.
	Width int

	//NoiseCount text noise count.
	NoiseCount int

	//ShowLineOptions := OptionShowHollowLine | OptionShowSlimeLine | OptionShowSineLine .
	ShowLineOptions int

	//Length random string length.
	Length int

	//BgColor captcha image background color (optional)
	BgColor *color.RGBA

	//Fonts loads by name see fonts.go's comment
	Fonts        []*truetype.Font
	LanguageCode string
	// contains filtered or unexported fields
}

DriverLanguage generates language unicode by lanuage

func NewDriverLanguage ¶

func NewDriverLanguage(height int, width int, noiseCount int, showLineOptions int, length int, bgColor *color.RGBA, fontsStorage FontsStorage, fonts []*truetype.Font, languageCode string) *DriverLanguage

NewDriverLanguage creates a driver

func (*DriverLanguage) DrawCaptcha ¶

func (d *DriverLanguage) DrawCaptcha(content string) (item Item, err error)

DrawCaptcha creates item

func (*DriverLanguage) GenerateIdQuestionAnswer ¶

func (d *DriverLanguage) GenerateIdQuestionAnswer() (id, content, answer string)

GenerateIdQuestionAnswer creates content and answer

type DriverMath ¶

type DriverMath struct {
	//Height png height in pixel.
	Height int

	// Width Captcha png width in pixel.
	Width int

	//NoiseCount text noise count.
	NoiseCount int

	//ShowLineOptions := OptionShowHollowLine | OptionShowSlimeLine | OptionShowSineLine .
	ShowLineOptions int

	//BgColor captcha image background color (optional)
	BgColor *color.RGBA

	//Fonts loads by name see fonts.go's comment
	Fonts []string
	// contains filtered or unexported fields
}

DriverMath captcha config for captcha math

func NewDriverMath ¶

func NewDriverMath(height int, width int, noiseCount int, showLineOptions int, bgColor *color.RGBA, fontsStorage FontsStorage, fonts []string) *DriverMath

NewDriverMath creates a driver of math

func (*DriverMath) ConvertFonts ¶

func (d *DriverMath) ConvertFonts() *DriverMath

ConvertFonts loads fonts from names

func (*DriverMath) DrawCaptcha ¶

func (d *DriverMath) DrawCaptcha(question string) (item Item, err error)

DrawCaptcha creates math captcha item

func (*DriverMath) GenerateIdQuestionAnswer ¶

func (d *DriverMath) GenerateIdQuestionAnswer() (id, question, answer string)

GenerateIdQuestionAnswer creates id,captcha content and answer

type DriverString ¶

type DriverString struct {
	// Height png height in pixel.
	Height int

	// Width Captcha png width in pixel.
	Width int

	//NoiseCount text noise count.
	NoiseCount int

	//ShowLineOptions := OptionShowHollowLine | OptionShowSlimeLine | OptionShowSineLine .
	ShowLineOptions int

	//Length random string length.
	Length int

	//Source is a unicode which is the rand string from.
	Source string

	//BgColor captcha image background color (optional)
	BgColor *color.RGBA

	//Fonts loads by name see fonts.go's comment
	Fonts []string
	// contains filtered or unexported fields
}

DriverChar captcha config for captcha-engine-characters.

func NewDriverString ¶

func NewDriverString(height int, width int, noiseCount int, showLineOptions int, length int, source string, bgColor *color.RGBA, fontsStorage FontsStorage, fonts []string) *DriverString

NewDriverString creates driver

func (*DriverString) ConvertFonts ¶

func (d *DriverString) ConvertFonts() *DriverString

ConvertFonts loads fonts by names

func (*DriverString) DrawCaptcha ¶

func (d *DriverString) DrawCaptcha(content string) (item Item, err error)

DrawCaptcha draws captcha item

func (*DriverString) GenerateIdQuestionAnswer ¶

func (d *DriverString) GenerateIdQuestionAnswer() (id, content, answer string)

GenerateIdQuestionAnswer creates id,content and answer

type EmbeddedFontsStorage ¶ added in v1.3.5

type EmbeddedFontsStorage struct {
	// contains filtered or unexported fields
}

func NewEmbeddedFontsStorage ¶ added in v1.3.5

func NewEmbeddedFontsStorage(fs embed.FS) *EmbeddedFontsStorage

func (*EmbeddedFontsStorage) LoadFontByName ¶ added in v1.3.5

func (s *EmbeddedFontsStorage) LoadFontByName(name string) *truetype.Font

func (*EmbeddedFontsStorage) LoadFontsByNames ¶ added in v1.3.5

func (s *EmbeddedFontsStorage) LoadFontsByNames(assetFontNames []string) []*truetype.Font

LoadFontsByNames import fonts from dir. make the simple-font(RitaSmith.ttf) the first font of trueTypeFonts.

type FontsStorage ¶ added in v1.3.5

type FontsStorage interface {
	// LoadFontByName returns the font from the storage
	LoadFontByName(name string) *truetype.Font

	// LoadFontsByNames returns multiple fonts from storage
	LoadFontsByNames(assetFontNames []string) []*truetype.Font
}

FontsStorage interface for working with fonts

type Item ¶

type Item interface {
	//WriteTo writes to a writer
	WriteTo(w io.Writer) (n int64, err error)
	//EncodeB64string encodes as base64 string
	EncodeB64string() string
}

Item is captcha item interface

type ItemAudio ¶

type ItemAudio struct {
	// contains filtered or unexported fields
}

ItemAudio captcha-audio-engine return type.

func (*ItemAudio) EncodeB64string ¶

func (a *ItemAudio) EncodeB64string() string

EncodeB64string encodes a sound to base64 string

func (*ItemAudio) WriteTo ¶

func (a *ItemAudio) WriteTo(w io.Writer) (n int64, err error)

WriteTo writes captcha audio in WAVE format into the given io.Writer, and returns the number of bytes written and an error if any.

type ItemChar ¶

type ItemChar struct {
	// contains filtered or unexported fields
}

ItemChar captcha item of unicode characters

func NewItemChar ¶

func NewItemChar(w int, h int, bgColor color.RGBA) *ItemChar

NewItemChar creates a captcha item of characters

func (*ItemChar) BinaryEncoding ¶

func (item *ItemChar) BinaryEncoding() []byte

BinaryEncoding encodes an image to PNG and returns a byte slice.

func (*ItemChar) EncodeB64string ¶

func (item *ItemChar) EncodeB64string() string

EncodeB64string encodes an image to base64 string

func (*ItemChar) WriteTo ¶

func (item *ItemChar) WriteTo(w io.Writer) (int64, error)

WriteTo writes captcha character in png format into the given io.Writer, and returns the number of bytes written and an error if any.

type ItemDigit ¶

type ItemDigit struct {
	*image.Paletted
	// contains filtered or unexported fields
}

ItemDigit digits captcha Struct

func NewItemDigit ¶

func NewItemDigit(width int, height int, dotCount int, maxSkew float64) *ItemDigit

NewItemDigit create a instance of item-digit

func (*ItemDigit) EncodeB64string ¶

func (m *ItemDigit) EncodeB64string() string

EncodeB64string encodes an image to base64 string

func (*ItemDigit) EncodeBinary ¶

func (m *ItemDigit) EncodeBinary() []byte

EncodeBinary encodes an image to PNG and returns a byte slice.

func (*ItemDigit) WriteTo ¶

func (m *ItemDigit) WriteTo(w io.Writer) (int64, error)

WriteTo writes captcha character in png format into the given io.Writer, and returns the number of bytes written and an error if any.

type Store ¶

type Store interface {
	// Set sets the digits for the captcha id.
	Set(id string, value string) error

	// 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
}

Store An object implementing Store interface can be registered with SetCustomStore function to handle storage and retrieval of captcha ids and solutions for them, replacing the default memory store.

It is the responsibility of an object to delete expired and used captchas when necessary (for example, the default memory store collects them in Set method after the certain amount of captchas has been stored.)

func NewMemoryStore ¶

func NewMemoryStore(collectNum int, expiration time.Duration) Store

NewMemoryStore returns a new standard memory store for captchas with the given collection threshold and expiration time (duration). The returned store must be registered with SetCustomStore to replace the default one.

type StoreSyncMap ¶ added in v1.3.2

type StoreSyncMap struct {
	// contains filtered or unexported fields
}

StoreSyncMap use sync.Map as store

func NewStoreSyncMap ¶ added in v1.3.2

func NewStoreSyncMap(liveTime time.Duration) *StoreSyncMap

NewStoreSyncMap new a instance

func (StoreSyncMap) Get ¶ added in v1.3.2

func (s StoreSyncMap) Get(id string, clear bool) string

Set a string value

func (StoreSyncMap) Set ¶ added in v1.3.2

func (s StoreSyncMap) Set(id string, value string)

Get get a string value

func (StoreSyncMap) Verify ¶ added in v1.3.2

func (s StoreSyncMap) Verify(id, answer string, clear bool) bool

Verify check a string value

Directories ¶

Path Synopsis
example of HTTP server that uses the captcha package.
example of HTTP server that uses the captcha package.

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