增加: nga 帖子更新 (#1324)

Closes #1311

docs/README.md

@@ -575,6 +575,8 @@ RSSHub 提供下列 API 接口:
 
 <route name="分区帖子" author="xyqfer" example="/nga/forum/485" path="/nga/forum/:fid"  :paramsDesc="['分区 id, 可在分区主页 URL 找到']"/>
 
+<route name="帖子" author="xyqfer" example="/nga/post/15939161" path="/nga/post/:tid"  :paramsDesc="['帖子 id, 可在帖子 URL 找到']"/>
+
 ### Facebook
 
 <route name="粉絲專頁" author="maple3142" example="/facebook/page/SonetPCR" path="/facebook/page/:id" :paramsDesc="['專頁 id']"/>

lib/router.js

@@ -886,6 +886,7 @@ router.get('/coolbuy/newest', require('./routes/coolbuy/newest'));
 
 // NGA
 router.get('/nga/forum/:fid', require('./routes/nga/forum'));
+router.get('/nga/post/:tid', require('./routes/nga/post'));
 
 // JavBus
 router.get('/javbus/home', require('./routes/javbus/home'));

lib/routes/nga/post.js

@@ -0,0 +1,47 @@
+const axios = require('../../utils/axios');
+const cheerio = require('cheerio');
+const iconv = require('iconv-lite');
+
+module.exports = async (ctx) => {
+    const { tid } = ctx.params;
+    const link = `https://nga.178.com/read.php?tid=${tid}&rand=${Math.random() * 1000}`;
+    const timestamp = Math.floor(Date.now() / 1000);
+    const response = await axios({
+        method: 'get',
+        url: link,
+        responseType: 'arraybuffer',
+        headers: {
+            Cookie: `guestJs=${timestamp};`,
+        },
+    });
+
+    const htmlString = iconv.decode(response.data, 'gbk');
+    const $ = cheerio.load(htmlString);
+    const title = $('title').text() || '';
+    const description = $('#postcontentandsubject0').html() || '';
+    let pubDate = new Date($('#postdate0').text()).toUTCString();
+
+    if ($('#alertc0').length > 0) {
+        const matches = htmlString.match(/<span id='alertc0'><\/span><script>commonui\.loadAlertInfo\('\[E(\d+)[\s\S]+?\t|\n\]','alertc0'\)<\/script>/);
+
+        if (matches && matches[1]) {
+            pubDate = new Date(parseInt(matches[1]) * 1000).toUTCString();
+        }
+    }
+
+    const items = [
+        {
+            title,
+            link,
+            description,
+            guid: pubDate,
+            pubDate,
+        },
+    ];
+
+    ctx.state.data = {
+        title: `nga-${title}`,
+        link,
+        item: items,
+    };
+};