feat: send preparative requests on YooForum did mount

README.md

@@ -14,4 +14,5 @@
 - [ ] 适配 iOS 登录失败 toast
 - [ ] 在启动时检测是否已登录
 - [ ] Splash 检测网络出错后在 Splash UI 中显示错误并不跳转
+- [ ] Forum 初始化失败后 UI 显示错误信息
 

src/component/YooForum.js

@@ -1,7 +1,101 @@
 import React, {Component} from 'react';
+import {ToastAndroid} from 'react-native';
 import YooForumUI from '../ui/YooForumUI';
+import {gbkFetch} from '../api/HTTP';
+import CookieManager from '@react-native-community/cookies';
+
+const ShowErrorToast = () =>
+  ToastAndroid.show('获取数据时出错', ToastAndroid.SHORT);
 
 export default class YooForum extends Component {
+  constructor(props) {
+    super(props);
+    this.initForum = this.initForum.bind(this);
+  }
+
+  componentDidMount() {
+    this.initForum();
+  }
+
+  initForum() {
+    // get dwr session id
+    gbkFetch(
+      'POST',
+      'http://eol.ctbu.edu.cn/meol/dwr/call/plaincall/__System.generateId.dwr',
+      {
+        headers: {
+          Origin: 'http://eol.ctbu.edu.cn',
+          'Content-Type': 'text/plain',
+          'User-Agent': 'YooMooc',
+          Referer:
+            'http://eol.ctbu.edu.cn/meol/jpk/course/layout/newpage/index.jsp?courseId=46445',
+          'Accept-Language': 'zh-CN,zh;q=0.9,en;q=0.8,en-US;q=0.7',
+        },
+        body:
+          'callCount=1\n' +
+          'c0-scriptName=__System\n' +
+          'c0-methodName=generateId\n' +
+          'c0-id=0\n' +
+          'batchId=0\n' +
+          'instanceId=0\n' +
+          'page=%2Fmeol%2Fjpk%2Fcourse%2Flayout%2Fnewpage%2Findex.jsp%3FcourseId%3D46445\n' +
+          'scriptSessionId=\n' +
+          'windowName=\n',
+      },
+    )
+      .then((response) => {
+        if (/[^"]*"\);/.test(response)) {
+          this.setState({
+            textContent: response.match(/[^"]*"\);/)[0].split('"')[0],
+          });
+          const exDate = new Date();
+          exDate.setDate(exDate.getDate() + 1);
+          CookieManager.set(
+            'http://eol.ctbu.edu.cn/meol/jpk/course/layout/newpage/index.jsp?courseId=46445',
+            {
+              name: 'DWRSESSIONID',
+              value: response.match(/[^"]*"\);/)[0].split('"')[0],
+              domain: 'eol.ctbu.edu.cn',
+              path: '/meol',
+              version: '1',
+              expires: exDate.toUTCString(),
+            },
+          ).then(() => {
+            // it is needed to request some pages before getting the topic list
+            // maybe the server is judging which course the user is
+            gbkFetch(
+              'GET',
+              'http://eol.ctbu.edu.cn/meol/jpk/course/layout/newpage/index.jsp?courseId=46445',
+              {
+                headers: {
+                  'Upgrade-Insecure-Requests': '1',
+                  'User-Agent': 'YooMooc',
+                },
+              },
+            )
+              .then(() => {
+                gbkFetch(
+                  'GET',
+                  'http://eol.ctbu.edu.cn/meol/jpk/course/layout/newpage/default_demonstrate.jsp',
+                  {
+                    'Upgrade-Insecure-Requests': '1',
+                    'User-Agent': 'YooMooc',
+                    Referer:
+                      'http://eol.ctbu.edu.cn/meol/jpk/course/layout/newpage/index.jsp?courseId=46445',
+                  },
+                )
+                  .then()
+                  .catch(ShowErrorToast);
+              })
+              .catch(ShowErrorToast);
+          });
+        } else {
+          ShowErrorToast();
+        }
+      })
+      .catch(ShowErrorToast);
+  }
+
   render() {
     return <YooForumUI />;
   }