[new route] 获取cnbeta topic feed (#8015)

Co-authored-by: GitHub Action <action@github.com>

docs/new-media.md

@@ -168,6 +168,10 @@ pageClass: routes
 
 <Route author="kt286 HaitianLiu" example="/cnbeta" path="/cnbeta"/>
 
+### 主题
+
+<Route author="cczhong11" example="/cnbeta/topic/453" path="/cnbeta/topic/:topic_id"/>
+
 ## Common App
 
 ### Blog

lib/router.js

@@ -1823,6 +1823,7 @@ router.get('/maoyan/upcoming', lazyloadRouteHandler('./routes/maoyan/upcoming'))
 
 // cnBeta
 router.get('/cnbeta', lazyloadRouteHandler('./routes/cnbeta/home'));
+router.get('/cnbeta/topic/:topic_id', lazyloadRouteHandler('./routes/cnbeta/topic'));
 
 // 国家退伍士兵信息
 router.get('/gov/veterans/:type', lazyloadRouteHandler('./routes/gov/veterans/china'));

lib/routes/cnbeta/topic.js

@@ -0,0 +1,75 @@
+const got = require('@/utils/got');
+const cheerio = require('cheerio');
+const date = require('@/utils/date');
+module.exports = async (ctx) => {
+    const topicUrl = `https://www.cnbeta.com/topics/${ctx.params.topic_id}.htm`;
+    const response = await got({
+        method: 'get',
+        url: topicUrl,
+    });
+    const $ = cheerio.load(response.data);
+
+    const topicInfo = $('div.cate-brief h2 b').text();
+    const news_list = $('div.item')
+        .map((i, item) => {
+            const title = $(item).find('dl dt a').text();
+            let href = $(item).find('dl dt a').attr('href');
+            if (href === undefined) {
+                return null;
+            }
+            if (href.startsWith('//')) {
+                href = 'https:' + href;
+            }
+            const status = $(item).find('div.meta-data ul.status li')['0'].children[0].data;
+            const info = status.split(' ');
+            const author = info[0];
+            const pubDate = info[1] + ' ' + info[2];
+            return { title, href, author, pubDate };
+        })
+        .filter((x) => x)
+        .map((i, e) => e)
+        .get();
+
+    const ProcessFeed = (data) => {
+        const $ = cheerio.load(data);
+
+        // 移除6.18广告
+        $('.article-global').remove();
+        $('.article-topic').remove();
+
+        // 提取内容
+        return $('.article-summary p').html() + '<br>' + $('.article-content').html();
+    };
+
+    const out = await Promise.all(
+        news_list.map(async (item) => {
+            const cache = await ctx.cache.get(item.href);
+            if (cache) {
+                return Promise.resolve(JSON.parse(cache));
+            }
+
+            const response = await got({
+                method: 'get',
+                url: item.href,
+            });
+
+            const description = ProcessFeed(response.data);
+            const single = {
+                title: item.title,
+                description,
+                pubDate: date(item.pubDate, +8),
+                link: item.href,
+                author: item.author,
+            };
+            ctx.cache.set(item.href, JSON.stringify(single));
+            return Promise.resolve(single);
+        })
+    );
+
+    ctx.state.data = {
+        title: `cnBeta专题 - ${topicInfo}`,
+        link: topicUrl,
+        item: out ?? [],
+        description: `cnBeta专题 - ${topicInfo}`,
+    };
+};