make code more stable: 不写死原始脚本的 url

Author: dongyuwei

src/http_static_server.js

@@ -9,6 +9,8 @@ const server = http.createServer((req, res) => {
             'Cache-Control': 'no-cache',
             'Content-Type': 'application/x-javascript; charset=utf-8'}
         );
+        var original = decodeURIComponent(req.url.split('original=')[1]);
+        res.write(`window.wechatOriginalScript="${original}";\n`, 'utf-8');
         return res.end(fs.readFileSync(path.join(__dirname, 'wechat_injection.js'), 'utf-8'));
     } 
 

src/phantomjs_wechat.js

@@ -14,7 +14,12 @@ page.onResourceRequested = function(requestData, networkRequest) {
     if (!redirected[url] && url.match(/wx.qq.com\/a\/wx_fed\/webwx\/res\/static\/js\/index_(.+)\.js$/)) {
         redirected[url] = true;
         console.log('>>> onResourceRequested', url)
-        networkRequest.changeUrl('http://127.0.0.1:8000/hijacked_wechat_index.js?v=' + new Date().getTime());
+        networkRequest.changeUrl(
+          "http://127.0.0.1:8000/hijacked_wechat_index.js?v=" +
+            new Date().getTime() +
+            "&original=" +
+            encodeURIComponent(url)
+        );
     }
 
     if (url.indexOf('/qrcode/') !== -1) {

src/wechat_injection.js

@@ -90,18 +90,17 @@ console.log("### wechat index js hijacked ###");
   }
 
   (function loadOriginalScript() {
-    var indexScript =
-      "https://res.wx.qq.com/a/wx_fed/webwx/res/static/js/index_c7d281c.js";
+    var originalScript = window.wechatOriginalScript;
 
     $.ajax({
-      url: indexScript,
+      url: originalScript,
       dataType: "text",
       success: function(script, textStatus, jqxhr) {
         if (jqxhr.status === 200) {
           //phantomjs does not support ECMA6 language features
           script = script.replace(" let ", " var ");
           window.eval(script);
-          console.log(indexScript + " loaded.");
+          console.log("original script " + originalScript + " loaded.");
         }
       }
     });