github.com/ptonlix/go-captcha
Behavioral Captcha
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Go Captcha is a behavioral captcha, which implements the generation of random verification text and the verification of click position information.
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$ 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
$ 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
$ go get -u github.com/golang/freetype
$ go get -u golang.org/x/crypto
$ go get -u golang.org/x/image
$ go get -u github.com/wenlng/go-captcha/captcha
package main
import "github.com/wenlng/go-captcha/captcha"
func main(){
// ...
}
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)
}
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)
}
After version v1.2.3, the default size of large drawing is 300×240px, the default size of the small drawing is 150×40px.
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)
}
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",
})
}
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)
}
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)
}
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)
}
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)
}
// 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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