:sunglasses:Package captcha provides an easy to use, unopinionated API for captcha generation

Package captcha provides an easy to use, unopinionated API for captcha generation.

PkgGoDev Build Status codecov Go Report Card

Why another captcha generator?

I want a simple and framework-independent way to generate captcha. It also should be flexible, at least allow me to pick my favorite font.

install

go get github.com/steambap/captcha

usage

func handle(w http.ResponseWriter, r *http.Request) {
	// create a captcha of 150x50px
	data, _ := captcha.New(150, 50)

	// session come from other library such as gorilla/sessions
	session.Values["captcha"] = data.Text
	session.Save(r, w)
	// send image data to client
	data.WriteImage(w)
}

documentation | example

sample image

image

image

Contributing

If your found a bug, please contribute! see contributing.md for more detail.

License

MIT

Owner
Weilin Shi
Weilin Shi
https://github.com/steambap/captcha https://pkg.go.dev/github.com/steambap/captcha
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Comments
  • 是否增加一个配置生成自定义文本

    是否增加一个配置生成自定义文本

    https://github.com/steambap/captcha/blob/6aa88d953f8e846f4988439de8238ad62956b9d2/captcha.go#L137

    如，增加一个：

    Generator: func() (string, string)

    目的自定义文本和结果 例如：生成一个 天上?? , 服务的session值: 人间

    text := ""
equation := ""
if options.Generator != nil {
    text, equation = options.Generator()
} else {
    text, equation = randomEquation()
}
......
drawText(equation, img, options)

    eg.

    options.Generator = func() (text string, equation string) {
	data := [][]string{
		{"天上", "人间"},
		{"守株", "待兔"},
	}
	item := data[rand.Intn(len(data))]
	equation = item[0] + ":?"
	text = item[1]
	return
}
  • Make New() concurrency-safe

    Make New() concurrency-safe

    A Source created by rand.NewSource() is not safe for concurrent use. To make this library concurrency-safe, I would suggest doing the following:

    • Use the top-level functions of math/rand package such as rand.Intn() and rand.Float64().
    • Provide a seed in init() function.
  • Globalvars

    Globalvars

    should be applied after:

    • https://github.com/steambap/captcha/pull/3
    • https://github.com/steambap/captcha/pull/2

    GlobalVars and Init functions inside package should not be used, this refactors a bit code to hide those variables and remove a need in Init function.

    Breaks a bit backward compatibility.

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