add 北京天文馆每日一图 (#1653)

docs/README.md

@@ -3094,6 +3094,10 @@ type 为 all 时，category 参数不支持 cost 和 free
 
 <route name="最新动态" author="LogicJake" example="/12306/zxdt" path="/12306/zxdt/:id?" :paramsDesc="['铁路局id，可在 URL 中找到，不填默认显示所有铁路局动态']"/>
 
+### 北京天文馆
+
+<route name="每日一图" author="radaiming" example="/bjp/apod" path="/bjp/apod"/>
+
 ### 洛谷
 
 <route name="日报" author="LogicJake" example="/luogu/daily" path="/luogu/daily/:id?" :paramsDesc="['年度日报所在帖子id，可在 URL 中找到，不填默认为2019年日报']"/>

lib/router.js

@@ -1104,6 +1104,9 @@ router.get('/dcard/posts/:type?', require('./routes/dcard/posts'));
 // 12306
 router.get('/12306/zxdt/:id?', require('./routes/12306/zxdt'));
 
+// 北京天文馆每日一图
+router.get('/bjp/apod', require('./routes/bjp/apod'));
+
 // 洛谷日报
 router.get('/luogu/daily/:id?', require('./routes/luogu/daily'));
 

lib/routes/bjp/apod.js

@@ -0,0 +1,51 @@
+const cheerio = require('cheerio');
+const axios = require('../../utils/axios');
+
+module.exports = async (ctx) => {
+    const baseUrl = 'http://www.bjp.org.cn';
+    const indexUrl = baseUrl + '/col/col89/index.html';
+
+    let limit = parseInt(ctx.query.limit);
+    if (isNaN(limit) || limit === 0) {
+        limit = 5;
+    }
+    const res = await axios.get(indexUrl);
+    const data = res.data;
+    const $ = cheerio.load(data);
+    const list = $('b > a');
+    const urls = [];
+    const titles = [];
+    for (let i = 0; i < limit && i < list.length; i++) {
+        urls.push(baseUrl + list[i].attribs.href);
+        titles.push(list[i].attribs.title);
+    }
+
+    const items = await Promise.all(
+        urls.map(async (url, i) => {
+            const cache = await ctx.cache.get(url);
+            if (cache) {
+                return Promise.resolve(JSON.parse(cache));
+            }
+            const data = (await axios.get(url)).data;
+            const $ = cheerio.load(data);
+            const time = $('meta[name=pubDate]').attr('content');
+            const title = titles[i];
+            const item = {
+                title,
+                pubDate: new Date(time).toUTCString(),
+                description: $('body > table > tbody')
+                    .eq(1)
+                    .html(),
+                link: url,
+                guid: url,
+            };
+            ctx.cache.set(url, JSON.stringify(item), limit * 24 * 60 * 60);
+            return Promise.resolve(item);
+        })
+    );
+    ctx.state.data = {
+        title: '北京天文馆每日一图',
+        link: indexUrl,
+        item: items,
+    };
+};