微信OAuth2.0网页授权设置一个域名需多个域名使用的问题 (转载)

  • 2022-03-15 20:56
  • by 刘管家
  • 1901
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最近遇到一个问题,一个微信公众号,需要在多个域名上使用OAuth2.0网页授权,但微信OAuth2.0网页授权回调域名只能设置一个。

解决办法:

通过多一次的跳转,解决了微信限制回调域名只能设置一个的问题。

跳转网页代码get-weixin-code.html

复制代码

<!DOCTYPE html><html lang="en">

    <head>
        <meta charset="UTF-8">
        <title>微信登录</title>
    </head>

    <body>
        <script>
            var GWC = {
                version: '1.1.1',
                urlParams: {},
                appendParams: function(url, params) {                    if (params) {                        var baseWithSearch = url.split('#')[0];                        var hash = url.split('#')[1];                        for (var key in params) {                            var attrValue = params[key];                            if (attrValue !== undefined) {                                var newParam = key + "=" + attrValue;                                if (baseWithSearch.indexOf('?') > 0) {                                    var oldParamReg = new RegExp('^' + key + '=[-%.!~*\'\(\)\\w]*', 'g');                                    if (oldParamReg.test(baseWithSearch)) {
                                        baseWithSearch = baseWithSearch.replace(oldParamReg, newParam);
                                    } else {
                                        baseWithSearch += "&" + newParam;
                                    }
                                } else {
                                    baseWithSearch += "?" + newParam;
                                }
                            }
                        }                        if (hash) {
                            url = baseWithSearch + '#' + hash;
                        } else {
                            url = baseWithSearch;
                        }
                    }                    return url;
                },
                getUrlParams: function() {                    var pairs = location.search.substring(1).split('&');                    for (var i = 0; i < pairs.length; i++) {                        var pos = pairs[i].indexOf('=');                        if (pos === -1) {                            continue;
                        }
                        GWC.urlParams[pairs[i].substring(0, pos)] = decodeURIComponent(pairs[i].substring(pos + 1));
                    }
                },
                doRedirect: function() {                    var code = GWC.urlParams['code'];                    var appId = GWC.urlParams['appid'];                    var scope = GWC.urlParams['scope'] || 'snsapi_base';                    var state = GWC.urlParams['state'];                    var isMp = GWC.urlParams['isMp']; //isMp为true时使用开放平台作授权登录,false为网页扫码登录
                    var baseUrl;                    var redirectUri;                    if (!code) {
                        baseUrl = "https://open.weixin.qq.com/connect/oauth2/authorize#wechat_redirect";                        if(scope == 'snsapi_login' && !isMp){
                            baseUrl = "https://open.weixin.qq.com/connect/qrconnect";
                        }                        //第一步,没有拿到code,跳转至微信授权页面获取code                        redirectUri = GWC.appendParams(baseUrl, {                            'appid': appId,                            'redirect_uri': encodeURIComponent(location.href),                            'response_type': 'code',                            'scope': scope,                            'state': state,
                        });
                    } else {                        //第二步,从微信授权页面跳转回来,已经获取到了code,再次跳转到实际所需页面                        redirectUri = GWC.appendParams(GWC.urlParams['redirect_uri'], {                            'code': code,                            'state': state
                        });
                    }
                    location.href = redirectUri;
                }
            };
            GWC.getUrlParams();
            GWC.doRedirect();        </script>
    </body></html>

复制代码

使用方法

  1. 部署get-weixin-code.html至你的微信授权回调域名的目录下,例如http://wx.abc.com/get-weixin-code.html

  2. 在其他页面的使用方式如下,类似于直接通过微信回调的方式,只是将回调地址改成了get-weixin-code.html的地址,另外省 去了response_type参数(因为它只能为code)以及#wechat_redirect的hash,它们会在get-weixin- code.html里面去加上

    location.href = 'http://wx.abc.com/get-weixin-code.html?appid=XXX&scope=XXX&state=XXX&redirect_uri=' + encodeURIComponent(location.href);
  3. get-weixin-code.html页面从微信那里拿到code之后会重新跳转回调用的页面,并且在url后面带上code


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