repair wechat bug (#4150)

frontend/src/app.js

@@ -135,8 +135,13 @@ class App extends Component {
       navigate(url, {repalce: true});
     } else {
       let url = siteRoot + 'lib/' + selectedItem.repo_id + '/file' + Utils.encodePath(selectedItem.path);
+      let isWeChat = Utils.isWeChat();
+      if (!isWeChat) {
         let newWindow = window.open('about:blank');
         newWindow.location.href = url;
+      } else {
+        location.href = url;
+      }
     }
   }
 

frontend/src/pages/lib-content-view/lib-content-view.js

@@ -1068,9 +1068,14 @@ class LibContentView extends React.Component {
       if (this.state.currentMode === 'column' && Utils.isMarkdownFile(direntPath)) {
         this.showColumnMarkdownFile(direntPath);
       } else {
-        const w=window.open('about:blank');
         const url = siteRoot + 'lib/' + repoID + '/file' + Utils.encodePath(direntPath);
-        w.location.href = url;
+        let isWeChat = Utils.isWeChat();
+        if (!isWeChat) {
+          let newWindow = window.open('about:blank');
+          newWindow.location.href = url;
+        } else {
+          location.href = url;
+        }
       }
     }
   }

frontend/src/utils/utils.js

@@ -38,6 +38,13 @@ export const Utils = {
     return window.innerWidth >= 768;
   },
 
+  isWeChat: function() {
+    let ua = window.navigator.userAgent.toLowerCase();
+    let isWeChat = ua.match(/MicroMessenger/i) == 'micromessenger';
+    let isEnterpriseWeChat = ua.match(/MicroMessenger/i) == 'micromessenger' && ua.match(/wxwork/i) == 'wxwork';
+    return isEnterpriseWeChat || isWeChat;
+  },
+
   FILEEXT_ICON_MAP: {
 
     // text file