A guide to using golang verification code

With the continuous development of Internet technology and application scenarios, verification codes have become one of the most important security technologies in the current Internet system. In web applications developed using golang language, how to use verification codes to ensure the security of user login, registration and other operations? This article will give a guide to using golang verification code for your reference.

1. Golang’s verification code library

golang provides a wealth of third-party verification code libraries to help us develop verification code functions, among which the more popular ones are:

1. Golang.org/x/image

Golang.org/x/image is the image processing library officially provided by golang. It provides various tools for processing images, including verification codes. In this library, we can use the freetype library to generate text verification codes, or use the gif library or png library to generate image verification codes, etc.

2. Github.com/dchest/captcha

Github.com/dchest/captcha is an open source verification code library that generates numbers based on the go language and image processing library and letters of the verification code. At the same time, this library also provides customizable verification code options, such as length, font, background, etc.

3. Github.com/mojocn/base64Captcha

Github.com/mojocn/base64Captcha is a verification code library developed based on go language. It will be generated according to different configurations Different types of verification codes, such as numbers, letters, Chinese, etc. At the same time, the library also supports a variety of verification code background patterns and interference effects, and can return verification code images in base64 encoding.

2. Generate golang verification code

Taking Github.com/mojocn/base64Captcha as an example, we will talk about how to use golang to generate verification code.

1. Install the base64Captcha library

Enter the following command in the terminal:

go get -u github.com/mojocn/base64Captcha

2. Create and set the verification code configuration

The sample code is as follows:

config := captcha.ConfigCharacter{
    Height:             60,
    Width:              240,
    Mode:               captcha.CaptchaModeNumberAlphabet,
    ComplexOfNoiseText: captcha.CaptchaComplexLower,
    ComplexOfNoiseDot:  captcha.CaptchaComplexLower,
    IsShowHollowLine:   false,
    IsShowNoiseDot:     true,
    IsShowNoiseText:    true,
    IsShowSlimeLine:    false,
    ChLen:              4,
}

In this example, we created a verification code configuration named config, which configures the height, width, color, interference lines, number of characters, etc. of the verification code. wait.

3. Generate the verification code and return the result to the front end

The code to generate the verification code is as follows:

id, b64s, err := captcha.Generate(base64Captcha.DriverString, config)

Here, we used captcha.Generate()The function generates a verification code and saves the result in the variable b64s.

Finally, we return the id of the verification code and the base64-encoded string b64s to the front-end for display by the front-end.

3. Verify golang verification code

After entering the verification code on the front end, we need to verify the verification code on the back end.

The sample code is as follows:

// verifyCode 为前端提交的验证码值
// verifyID 为前端提交的验证码ID
isCorrect := captcha.VerifyString(verifyID, verifyCode)
if !isCorrect {
    // 验证码不正确
} else {
    // 验证码正确
}

In this example, we use the captcha.VerifyString() function to verify whether the verification code submitted by the front end is correct. If the verification code is correct, return true, otherwise return false.

Summary

This article mainly introduces how golang uses verification codes to strengthen the security of web applications, and takes Github.com/mojocn/base64Captcha as an example to explain how to generate and verify golang verification code. I hope this article will be helpful to beginners learning golang.

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