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:
<!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>
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
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);
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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