go-captcha - Behavioral Verification Code

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Package captcha implements generation and click location verification of image CAPTCHAs.

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

Installation of proxy go module in China

GoProxy https://github.com/goproxy/goproxy.cn
AliProxy： https://mirrors.aliyun.com/goproxy/
OfficialProxy： https://goproxy.io/
ChinaProxy：https://goproxy.cn
Other：https://gocenter.io

Set Proxy of go module

Window

$ set GO111MODULE=on
$ set GOPROXY=https://goproxy.io,direct

### The Golang 1.13+ can be executed directly
$ go env -w GO111MODULE=on
$ go env -w GOPROXY=https://goproxy.io,direct

Linux or Mac

$ export GO111MODULE=on
$ export GOPROXY=https://goproxy.io,direct

### or
$ echo "export GO111MODULE=on" >> ~/.profile
$ echo "export GOPROXY=https://goproxy.cn,direct" >> ~/.profile
$ source ~/.profile

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

The SetFont and SetBackground configuration must be set
You can copy the resource files under the "__example/resources" to the directory of your project

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

func main(){
    // Captcha Single Instances
    capt := captcha.GetCaptcha()
    
    path, _ := os.Getwd()
    // ==========================
    // Config that must be set
    // --------------------------
    // Set font absolute path
    capt.SetFont([]string{
        path + "/__example/resources/fonts/fzshengsksjw_cu.ttf",
        path + "/__example/resources/fonts/fzssksxl.ttf",
    })
    
    // Set background image absolute path
    capt.SetBackground([]string{
        path + "/__example/resources/images/1.jpg",
        path + "/__example/resources/images/2.jpg",
    })
    
    // 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

Set Chars

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 image configuration

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

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

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

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

    // ====================================================
    // Method: SetThumbSize(size *Size);
    // Desc: Set size of captcha thumb
    // ====================================================
    capt.SetThumbSize(&captcha.Size{150, 40})

    // ====================================================
    // Method: SetFontDPI(val int);
    // Desc: Set random DPI of captcha font, The best is 72
    // ====================================================
    capt.SetFontDPI(72)

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

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

    // ====================================================
    // Method: SetRangCheckTextLen(val *captcha.RangeVal);
    // Desc:Set random length of check text
    // ====================================================
    capt.SetRangCheckTextLen(&captcha.RangeVal{2, 4})

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

    // ====================================================
    // Method: SetImageFontAlpha(val float64);
    // Desc:Set alpha of captcha font
    // ====================================================
    capt.SetImageFontAlpha(0.5)

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

    // ====================================================
    // Method: SetImageFontDistort(val int);
    // Desc:Set distort of captcha font
    // ====================================================
    capt.SetImageFontDistort(captcha.ThumbBackgroundDistortLevel2)
  
    // ====================================================
    // Method: SetThumbBgColors(colors []string);
    // Desc: Sets the random hex color of the captcha thumb background
    // ====================================================
    capt.SetThumbBgColors([]string{
        "#1d3f84",
        "#3a6a1e",
    })

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

    // ====================================================
    // Method: SetThumbBgDistort(val int);
    // Desc:Set distort of captcha thumb
    // ====================================================
    capt.SetThumbBgDistort(captcha.ThumbBackgroundDistortLevel2)

    // ====================================================
    // Method: SetThumbBgCirclesNum(val int);
    // Desc:Set circles number of captcha background
    // ====================================================
    capt.SetThumbBgCirclesNum(20)

    // ====================================================
    // Method: SetThumbBgSlimLineNum(val int);
    // Desc:Set line number of captcha background
    // ====================================================
    capt.SetThumbBgSlimLineNum(3)
    

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

Generate Captcha Data

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

func main(){
    capt := captcha.GetCaptcha()
    
    path, _ := os.Getwd()
    // set configuration ...
    // ==========================
    capt.SetFont([]string{
        path + "/__example/resources/fonts/fzshengsksjw_cu.ttf",
        path + "/__example/resources/fonts/fzssksxl.ttf",
    })
    capt.SetBackground([]string{
        path + "/__example/resources/images/1.jpg",
        path + "/__example/resources/images/2.jpg",
    })
    
    // 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 Of Fronted Example

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

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

Buy the author coffee: http://witkeycode.com/sponsor

LICENSE

MIT

wqggym/go-captcha