feat: add tieba post (#535)

ref (https://github.com/MoeFE/GoogleTranslate/commit/f734cd59e570c09625ebd0623aa845855f2a7132#commitcomment-30275584)

README.md

@@ -59,6 +59,8 @@ RSSHub 是一个轻量、易于扩展的 RSS 生成器，可以给任何奇奇
 -   贴吧
     -   帖子列表
     -   精品帖子
+    -   帖子动态
+    -   楼主动态
 -   即刻
     -   主题
     -   用户动态

docs/README.md

@@ -769,6 +769,26 @@ rid: 排行榜分区 id，默认 0
 
 `cid`: 精品分类，如果不传 `cid` 则获取全部分类
 
+### 帖子动态 <Author uid="u3u"/>
+
+举例: [https://rsshub.app/tieba/post/5853240586](https://rsshub.app/tieba/post/5853240586)
+
+路由: `/tieba/post/:id`
+
+参数：
+
+`id`: 帖子 ID
+
+### 楼主动态 <Author uid="u3u"/>
+
+举例: [https://rsshub.app/tieba/post/lz/5853240586](https://rsshub.app/tieba/post/lz/5853240586)
+
+路由: `/tieba/post/lz/:id`
+
+参数：
+
+`id`: 帖子 ID
+
 ## 即刻
 
 ### 主题-精选 <Author uid="DIYgod"/>

docs/joinus/README.md

@@ -103,6 +103,7 @@ ctx.state.data = {
 ```
 
 </details>
+
 ## 参与讨论
 
 1.  [Telegram 群](https://t.me/rsshub)

router.js

@@ -119,6 +119,12 @@ router.get('/weibo/user/:uid', require('./routes/weibo/user'));
 router.get('/weibo/user2/:uid', require('./routes/weibo/user2'));
 router.get('/weibo/keyword/:keyword', require('./routes/weibo/keyword'));
 
+// 贴吧
+router.get('/tieba/forum/:kw', require('./routes/tieba/forum'));
+router.get('/tieba/forum/good/:kw/:cid?', require('./routes/tieba/forum'));
+router.get('/tieba/post/:id', require('./routes/tieba/post'));
+router.get('/tieba/post/lz/:id', require('./routes/tieba/post'));
+
 // 网易云音乐
 router.get('/ncm/playlist/:id', require('./routes/ncm/playlist'));
 router.get('/ncm/user/playlist/:uid', require('./routes/ncm/userplaylist'));
@@ -149,10 +155,6 @@ router.get('/zhihu/people/answers/:id', require('./routes/zhihu/answers'));
 router.get('/zhihu/zhuanlan/:id', require('./routes/zhihu/zhuanlan'));
 router.get('/zhihu/daily', require('./routes/zhihu/daily'));
 
-// 贴吧
-router.get('/tieba/forum/:kw', require('./routes/tieba/forum'));
-router.get('/tieba/forum/good/:kw/:cid?', require('./routes/tieba/forum'));
-
 // 妹子图
 router.get('/mzitu', require('./routes/mzitu/category'));
 router.get('/mzitu/tags', require('./routes/mzitu/tags'));

routes/tieba/post.js

@@ -0,0 +1,67 @@
+const cheerio = require('cheerio');
+const axios = require('../../utils/axios');
+
+/**
+ * 获取最新的帖子回复（倒序查看）
+ *
+ * @param {*} id 帖子ID
+ * @param {number} [lz=0] 是否只看楼主（0: 查看全部, 1: 只看楼主）
+ * @param {number} [pn=7e6] 帖子最大页码（默认假设为 7e6，如果超出假设则根据返回的最大页码再请求一次，否则可以节省一次请求）
+ * 这个默认值我测试下来 7e6 是比较接近最大值了，因为当我输入 8e6 就会返回第一页的数据而不是最后一页了
+ * @returns
+ */
+async function getPost(id, lz = 0, pn = 7e6) {
+    const { data } = await axios({
+        method: 'get',
+        url: `https://tieba.baidu.com/p/${id}?see_lz=${lz}&pn=${pn}&ajax=1`,
+        headers: {
+            Referer: 'https://tieba.baidu.com/',
+        },
+    });
+    const $ = cheerio.load(data);
+    const max = Number.parseInt($('[max-page]').attr('max-page'));
+    if (max > pn) {
+        return getPost(id, max);
+    }
+    return data;
+}
+
+module.exports = async (ctx) => {
+    const { id } = ctx.params;
+    const lz = ctx._matchedRoute.includes('lz') ? 1 : 0;
+    const html = await getPost(id, lz);
+    const $ = cheerio.load(html);
+    const title = $('.core_title_txt')
+        .attr('title')
+        .substr(3);
+    const list = $('.p_postlist > [data-field]:not(:has(".ad_bottom_view"))');
+
+    ctx.state.data = {
+        title: lz ? `【只看楼主】${title}` : title,
+        link: `https://tieba.baidu.com/p/${id}?see_lz=${lz}`,
+        description: `${title}的最新回复`,
+        item:
+            list &&
+            list
+                .map((index, element) => {
+                    const item = $(element);
+                    const { author, content } = item.data('field');
+                    const [from, num, time] = item
+                        .find('.post-tail-wrap > .tail-info')
+                        .map((index, element) => $(element).text())
+                        .get();
+                    return {
+                        title: `${author.user_name}回复了帖子《${title}》`,
+                        description: [
+                            `<p>${content.content}</p>`,
+                            `作者：${author.user_name}`,
+                            `楼层：${num}`,
+                            `${from}`
+                        ].join('<br />'), // prettier-ignore
+                        pubDate: new Date(time).toUTCString(),
+                        link: `https://tieba.baidu.com/p/${id}?pid=${content.post_id}#${content.post_id}`,
+                    };
+                })
+                .get(),
+    };
+};