Go Captcha

Behavior Security Captcha

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Go Captcha is a behavior security CAPTCHA, which implements the generation of random verification text and the verification of click position information.

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Github：https://github.com/wenlng/go-captcha
Go Example：https://github.com/wenlng/go-captcha-example
Vue Example：https://github.com/wenlng/go-captcha-vue
React Example：https://github.com/wenlng/go-captcha-react
Online Demo：http://47.104.180.148:8081/go_captcha_demo

Dependency Library

$ go get -u github.com/golang/freetype
$ go get -u golang.org/x/crypto
$ go get -u golang.org/x/image

Install Captcha Module

$ go get -u github.com/wenlng/go-captcha/captcha

Import Captcha Module

package main

import "github.com/wenlng/go-captcha/captcha"

func main(){
   // ...
}

Quick Use

package main
import (
    "fmt"
    "github.com/wenlng/go-captcha/captcha"
)

func main(){
    // Captcha Single Instances
    capt := captcha.GetCaptcha()
    
    // Generate Captcha
    dots, b64, tb64, key, err := capt.Generate()
    if err != nil {
        panic(err)
        return
    }
    
    // Main image base64 code
    fmt.Println(len(b64))
    
    // Thumb image base64 code
    fmt.Println(len(tb64))
    
    // Only key
    fmt.Println(key)
    
    // Dot data For verification
    fmt.Println(dots)
}

Captcha Instances

New Instances or Get Single Instances

package main
import (
    "fmt"
    "github.com/wenlng/go-captcha/captcha"
)

func main(){
	// Captcha Instances
    // capt := captcha.NewCaptcha() 
    
    // Captcha Single Instances
    capt := captcha.GetCaptcha()

    // ====================================================
    fmt.Println(capt)

}

Set Configuration

After version v1.2.3, the default size of large drawing is 300×240px, the default size of the small drawing is 150×40px.

Set Chars

Some fonts are attached by default. If other Chinese strings are set, you may need to import a font file.

package main
import (
    "fmt"
    "github.com/wenlng/go-captcha/captcha"
)

func main(){
    capt := captcha.GetCaptcha()
    
    // ====================================================
    // Method: SetRangChars (chars []string) error;
    // Desc: Set random char of captcha
    // ====================================================
    // Letter
    //chars := "abcdefghijklmnopqrstuvwxyz0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"
    //_ = capt.SetRangChars(strings.Split(chars, ""))
    
    // Two Letter
    //chars := []string{"HE","CA","WO","NE","HT","IE","PG","GI","CH","CO","DA"}
    //_ = capt.SetRangChars(chars)

    // Chinese Char
    chars := []string{"你","好","呀","这","是","点","击","验","证","码","哟"}
    _ = capt.SetRangChars(chars)

    // ====================================================
    fmt.Println(capt)
}

Set Font File Configuration

You can copy the resource files under the "https://github.com/wenlng/go-captcha-example/tree/main/resources" to the directory of your project.

package main
import (
    "fmt"
    "os"
    "github.com/wenlng/go-captcha/captcha"
)

func main(){
    capt := captcha.GetCaptcha()
    
    path, _ := os.Getwd()    
    // ====================================================
    // Method: SetFont(fonts []string);
    // Desc: Set random font of captcha text
    // ====================================================
    capt.SetFont([]string{
        path + "/__example/resources/fonts/fzshengsksjw_cu.ttf",
    })
}

Set Big Image Configuration

Tip: Some images are attached by default.

package main
import (
    "fmt"
    "golang.org/x/image/font"
    "os"
    "github.com/wenlng/go-captcha/captcha"
)

func main(){
    capt := captcha.GetCaptcha()
    
    path, _ := os.Getwd()    
    // ====================================================
    // Method: SetBackground(color []string);
    // Desc: Set random image of background
    // ====================================================
    capt.SetBackground([]string{
        path + "/__example/resources/images/1.jpg",
        path + "/__example/resources/images/2.jpg",
    })

    // ====================================================
    // Method: SetImageSize(size Size);
    // Desc: Set size of captcha
    // ====================================================
    capt.SetImageSize(captcha.Size{300, 300})

    // ====================================================
    // Method: SetImageQuality(val int);
    // Desc: Set quality of captcha, The compression level ranges from 1 to 5. QualityCompressNone has no compression. The default is the lowest compression level
    // ====================================================
    capt.SetImageQuality(captcha.QualityCompressNone)

    // ====================================================
    // Method: SetFontHinting(val font.Hinting);
    // Desc: Set Hinting of font (HintingNone,HintingVertical,HintingFull)
    // ====================================================
    capt.SetFontHinting(font.HintingFull)

    // ====================================================
    // Method: SetTextRangLen(val captcha.RangeVal);
    // Desc: Set random length of font
    // ====================================================
    capt.SetTextRangLen(captcha.RangeVal{6, 7})

    // ====================================================
    // Method: SetRangFontSize(val captcha.RangeVal);
    // Desc: Set random size of font
    // ====================================================
    capt.SetRangFontSize(captcha.RangeVal{32, 42})

    // ====================================================
    // Method: SetTextRangFontColors(colors []string);
    // Desc: Set random hex color of font
    // ====================================================
    capt.SetTextRangFontColors([]string{
        "#1d3f84",
        "#3a6a1e",
    })
 
    // ====================================================
    // Method: SetImageFontAlpha(val float64);
    // Desc:Set alpha of font
    // ====================================================
    capt.SetImageFontAlpha(0.5)

    // ====================================================
    // Method: SetTextShadow(val bool);
    // Desc:Set shadow of font
    // ====================================================
    capt.SetTextShadow(true)

    // ====================================================
    // Method: SetTextShadowColor(val string);
    // Desc:Set shadow color of font
    // ====================================================
    capt.SetTextShadowColor("#101010")

    // ====================================================
    // Method: SetTextShadowPoint(val captcha.Point);
    // Desc:Set shadow point of font
    // ====================================================
    capt.SetTextShadowPoint(captcha.Point{1, 1})

    // ====================================================
    // Method: SetTextRangAnglePos(pos []captcha.RangeVal);
    // Desc:Set angle of font
    // ====================================================
    capt.SetTextRangAnglePos([]captcha.RangeVal{
        {1, 15},
        {15, 30},
        {30, 45},
        {315, 330},
        {330, 345},
        {345, 359},
    })

    // ====================================================
    // Method: SetImageFontDistort(val int);
    // Desc:Set distort of font
    // ====================================================
    capt.SetImageFontDistort(captcha.DistortLevel2)
}

Set Thumb Image Configuration

Tip: Some images are attached by default.

package main
import (
    "fmt"
    "os"
    "github.com/wenlng/go-captcha/captcha"
)

func main(){
    capt := captcha.GetCaptcha()
    
    path, _ := os.Getwd()    
    
    // ====================================================
    // Method: SetRangCheckTextLen(val captcha.RangeVal);
    // Desc:Set random length of font
    // ====================================================
    capt.SetRangCheckTextLen(captcha.RangeVal{2, 4})

    // ====================================================
    // Method: SetRangCheckFontSize(val captcha.RangeVal);
    // Desc:Set random size of font
    // ====================================================
    capt.SetRangCheckFontSize(captcha.RangeVal{24, 30})
 
    // ====================================================
    // Method: SetThumbTextRangFontColors(colors []string);
    // Desc: Set random hex color of font
    // ====================================================
    capt.SetThumbTextRangFontColors([]string{
        "#1d3f84",
        "#3a6a1e",
    })

    // ====================================================
    // Method: SetThumbBgColors(colors []string);
    // Desc: Sets the random hex color of the background
    // ====================================================
    capt.SetThumbBgColors([]string{
        "#1d3f84",
        "#3a6a1e",
    })

    // ====================================================
    // Method: SetThumbBackground(colors []string);
    // Desc:Set random image of background
    // ====================================================
    capt.SetThumbBackground([]string{
        path + "/__example/resources/images/r1.jpg",
        path + "/__example/resources/images/r2.jpg",
    })

    // ====================================================
    // Method: SetThumbBgDistort(val int);
    // Desc:Set the distort of background
    // ====================================================
    capt.SetThumbBgDistort(captcha.DistortLevel2)

    // ====================================================
    // Method: SetThumbFontDistort(val int);
    // Desc:Set the distort of font
    // ====================================================
    capt.SetThumbFontDistort(captcha.DistortLevel2)

    // ====================================================
    // Method: SetThumbBgCirclesNum(val int);
    // Desc:Sets the number of dots
    // ====================================================
    capt.SetThumbBgCirclesNum(20)

    // ====================================================
    // Method: SetThumbBgSlimLineNum(val int);
    // Desc:Set number of lines
    // ====================================================
    capt.SetThumbBgSlimLineNum(3)
  
}

Other

package main
import (
    "fmt"
    "os"
    "github.com/wenlng/go-captcha/captcha"
)

func main(){
    path, _ := os.Getwd()    
    // ====================================================
    // Method: ClearAssetCacheWithPath(paths []string) bool;
    // Desc: Clear Cache
    // ====================================================
    captcha.ClearAssetCacheWithPaths([]string{
    	path + "/__example/resources/images/1.jpg",
    	path + "/__example/resources/fonts/fonts.ttf",
    })     

    // ====================================================
    // Method: captcha.CheckPointDist(sx, sy, dx, dy, width, height int64) bool;
    // Desc: Check point position
    // ====================================================
    captcha.CheckPointDist(0, 30, 0, 30, 30, 30)    

    // ====================================================
    // Method: captcha.CheckPointDistWithPadding(sx, sy, dx, dy, width, height, padding int64) bool;
    // Desc: Check point position
    // ====================================================
    captcha.CheckPointDistWithPadding(0, 30, 0, 30, 30, 30, 5) 
}

Generate Captcha Data

package main
import (
    "fmt"
    "os"
    "github.com/wenlng/go-captcha/captcha"
)

func main(){
    capt := captcha.GetCaptcha()
    
    // generate ...
    // ====================================================
    // dots:  Character position information
    //  - {"0":{"Index":0,"Dx":198,"Dy":77,"Size":41,"Width":54,"Height":41,"Text":"SH","Angle":6,"Color":"#885500"} ...}
    // imageBase64:  Verify the clicked image
    // thumbImageBase64: Thumb displayed
    // key: Only Key
    // ====================================================
    dots, imageBase64, thumbImageBase64, key, err := capt.Generate()
    if err != nil {
        panic(err)
        return
    }
    fmt.Println(len(imageBase64))
    fmt.Println(len(thumbImageBase64))
    fmt.Println(key)
    fmt.Println(dots)
}

Api Params

// Example: Get captcha data
    Respose Data = {
        "code": 0,
        "image_base64": "...",
        "thumb_base64": "...",
        "captcha_key": "...",
    }     

// Example: Post check data
    Request Data = {
        dots: "x1,y1,x2,y2,...."
        key: "......"
    }

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LICENSE

MIT

wenlng / go-captcha Goto Github PK

go-captcha's Introduction

Go Captcha

Dependency Library

Install Captcha Module

Import Captcha Module

Quick Use

Captcha Instances

Set Configuration

Set Chars

Set Font File Configuration

Set Big Image Configuration

Set Thumb Image Configuration

Other

Generate Captcha Data

Api Params

LICENSE

go-captcha's People

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go-captcha's Issues

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