add 豆瓣话题 (#1665)

closes #1663

docs/README.md

@@ -536,6 +536,8 @@ RSSHub 提供下列 API 接口:
 
 </route>
 
+<route name="话题" author="LogicJake" example="/douban/topic/48823" path="/douban/topic/:id/:sort?" :paramsDesc="['话题id','排序方式，hot或new，默认为new']"/>
+
 ### Disqus
 
 <route name="评论" author="DIYgod" example="/disqus/posts/diygod-me" path="/disqus/posts/:forum" :paramsDesc="['网站的 disqus name']"/>

lib/router.js

@@ -214,6 +214,7 @@ router.get('/douban/book/rank/:type', require('./routes/douban/book/rank'));
 router.get('/douban/doulist/:id', require('./routes/douban/doulist'));
 router.get('/douban/explore/column/:id', require('./routes/douban/explore_column'));
 router.get('/douban/people/:userid/status', require('./routes/douban/people/status.js'));
+router.get('/douban/topic/:id/:sort?', require('./routes/douban/topic.js'));
 
 // 煎蛋
 router.get('/jandan/:sub_model', require('./routes/jandan/pic'));

lib/routes/douban/topic.js

@@ -0,0 +1,78 @@
+const axios = require('../../utils/axios');
+
+module.exports = async (ctx) => {
+    const id = ctx.params.id;
+    const sort = ctx.params.sort || 'new';
+
+    const link = `https://www.douban.com/gallery/topic/${id}/?sort=${sort}`;
+
+    const api = `https://m.douban.com/rexxar/api/v2/gallery/topic/${id}/items?sort=${sort}&start=0&count=10&status_full_text=1`;
+    const response = await axios({
+        method: 'GET',
+        url: api,
+        headers: {
+            Referer: link,
+        },
+    });
+
+    const data = response.data.items;
+    const title = data[0].topic.name;
+    const description = data[0].topic.introduction;
+
+    const out = await Promise.all(
+        data.map(async (item) => {
+            const type = item.target.type;
+            let author;
+            let date;
+            let description;
+            let link;
+            let title;
+            if (type === 'status') {
+                link = item.target.status.sharing_url;
+                author = item.target.status.author.name;
+                title = author + '的广播';
+                date = item.target.status.create_time;
+                description = item.target.status.text;
+                const images = item.target.status.images;
+                if (images) {
+                    let i;
+                    for (i in images) {
+                        description += `<br><img src="${images[i].normal.url}" referrerpolicy="no-referrer" />`;
+                    }
+                }
+            } else {
+                link = item.target.sharing_url;
+                author = item.target.author.name;
+                title = author + '的日记';
+                date = item.target.create_time;
+
+                const id = item.target.id;
+                const itemUrl = `https://www.douban.com/j/note/${id}/full`;
+
+                const cache = await ctx.cache.get(link);
+                if (cache) {
+                    return Promise.resolve(JSON.parse(cache));
+                }
+                const response = await axios.get(itemUrl);
+                description = response.data.html;
+            }
+            const single = {
+                title: title,
+                link: link,
+                author: author,
+                pubDate: new Date(date).toUTCString(),
+                description: description,
+            };
+
+            ctx.cache.set(link, JSON.stringify(single), 24 * 60 * 60);
+            return Promise.resolve(single);
+        })
+    );
+
+    ctx.state.data = {
+        title: `${title}-豆瓣话题`,
+        description: description,
+        link: link,
+        item: out,
+    };
+};