How to use Golang to implement WeChat JS-SDK for web applications

As a mobile application development platform, WeChat official account has become an essential tool for businesses and individuals to conduct online marketing, customer service and social activities.

WeChat JS-SDK is a development toolkit based on JSSDK provided by WeChat. Developers can use JS-SDK to obtain user information, share to Moments, send messages and other WeChat-specific functions. This article will teach you how to use Golang to implement the WeChat JS-SDK for web applications, allowing you to easily implement the WeChat public account development function.

1. What is WeChat JS-SDK

WeChat JS-SDK is a development toolkit provided by WeChat. It uses JSSDK technology. Developers can obtain user information through JS-SDK. Share to Moments, send messages and other WeChat-specific functions. WeChat JS-SDK is suitable for various application scenarios such as web development and public account development.

The main functions provided by WeChat JS-SDK include:

1. User information: Basic user information can be obtained through WeChat JS-SDK.
2. Sharing: Supports sharing web pages to WeChat friends, Moments and other platforms.
3. Payment: Support WeChat payment function.
4. Voice: Voice-based applications can be implemented through WeChat JS-SDK.

2. How to use Golang to implement WeChat JS-SDK

This article will use Golang as an example to introduce you to how to use Golang to implement WeChat JS-SDK for web applications.

1. Preparation

Before using the WeChat JS-SDK, you need to apply for the WeChat public account and jsapi_ticket. On the WeChat public platform, enter the Developer Center -> Basic Configuration, view and copy the AppID and AppSecret.

In the code, you need to use the following code to obtain jsapi_ticket:

func getJsapiTicket() string {
    requestURL := fmt.Sprintf("https://api.weixin.qq.com/cgi-bin/ticket/getticket?access_token=%s&type=jsapi", GetAccessToken())
    resp, _ := http.Get(requestURL)
    defer resp.Body.Close()
    body, _ := ioutil.ReadAll(resp.Body)
    var tmpJson map[string]string
    json.Unmarshal(body, &tmpJson)
    return tmpJson["ticket"]
}

2. Signature algorithm

After obtaining jsapi_ticket, you need to use the signature algorithm to generate a signature. The basic process of the signature algorithm is as follows:

1. Sort the random string, timestamp, url and other parameters according to the ASCII code from small to large.
2. Use the SHA1 algorithm to encrypt the sorted string.
3. Pass the encrypted string as the signature parameter to the WeChat official account backend.

The code implementation of the signature algorithm is as follows:

func sign(jsapiTicket, nonceStr, timestamp, url string) string {
    rawStr := fmt.Sprintf("jsapi_ticket=%s&noncestr=%s&timestamp=%s&url=%s",
        jsapiTicket, nonceStr, timestamp, url)
    h := sha1.New()
    h.Write([]byte(rawStr))
    return fmt.Sprintf("%x", h.Sum(nil))
}

3. Introducing JS-SDK into the page

Before introducing JS-SDK into the page, you need to first Introduce WeChat’s official JS library. In the code, you can use the following code to introduce the official JS library of WeChat:

<script src="//res.wx.qq.com/open/js/jweixin-1.0.0.js"></script>

For other code implementations, please refer to the following sample code:

//初始化
wx.config({
    debug: false,
    appId: 'xxxxxxxxxxxxxxxxx',
    timestamp: 1481156207,
    nonceStr: 'Wm3WZYTPz0wzccnW',
    signature: '0f9de62fce790f9a083d5c99e95740ceb90c27ed',
    jsApiList: [
        'checkJsApi',
        'onMenuShareAppMessage',
        'onMenuShareTimeline'
    ]
});

//在需要调用的页面中使用
wx.ready(function() {
    wx.checkJsApi({
        jsApiList: [
            'onMenuShareTimeline', 
            'onMenuShareAppMessage'
        ],
        success: function(res) {
            // console.log(res);
        }
    });
    wx.onMenuShareTimeline({
        title: '微信分享示例title',
        link: 'http://www.xxx.com',
        imgUrl: 'http://www.xxx.com/images/test.jpg',
        success: function() {},
        cancel: function() {}
    });
    wx.onMenuShareAppMessage({
        title: '微信分享示例title',
        desc: '微信分享示例desc',
        link: 'http://www.xxx.com',
        imgUrl: 'http://www.xxx.com/images/test.jpg',
        type: 'link',
        dataUrl: '',
        success: function() {},
        cancel: function() {}
    });
});

In the above code, wx.configUsed to configure JS-SDK, wx.checkJsApi used to check whether the API is available, wx.onMenuShareTimeline used to implement the function of sharing to friends, wx.onMenuShareAppMessage Used to implement the function of sharing to friends.

3. Summary

This article introduces how to use Golang to implement WeChat JS-SDK for web applications. In actual development, appropriate adjustments and optimizations need to be made according to specific circumstances. I believe that through the introduction of this article, readers have already had a preliminary understanding of how to use Golang to implement WeChat JS-SDK for web applications, and can quickly start using WeChat development and apply WeChat public account application development to actual business.

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