feat: 增加 Paul Graham Essays (#3589)

* feat: 增加 Paul Graham Essays

* refactor: Rename router

lib/routes/blogs/paulgraham.js

@@ -0,0 +1,46 @@
+const got = require('@/utils/got');
+const parser = require('@/utils/rss-parser');
+const cheerio = require('cheerio');
+
+const ProcessFeed = async (link) => {
+    const response = await got({
+        method: 'get',
+        url: link,
+    });
+
+    const $ = cheerio.load(response.data);
+
+    // 提取内容
+    return $('font').html();
+};
+
+module.exports = async (ctx) => {
+    const feed = await parser.parseURL('http://www.aaronsw.com/2002/feeds/pgessays.rss');
+
+    const items = await Promise.all(
+        feed.items.slice(0, 5).map(async (item) => {
+            const cache = await ctx.cache.get(item.link);
+            if (cache) {
+                return Promise.resolve(JSON.parse(cache));
+            }
+
+            const description = await ProcessFeed(item.link);
+
+            const single = {
+                title: item.title,
+                description,
+                link: item.link,
+                author: item.author,
+            };
+            ctx.cache.set(item.link, JSON.stringify(single));
+            return Promise.resolve(single);
+        })
+    );
+
+    ctx.state.data = {
+        title: feed.title,
+        link: 'http://www.paulgraham.com/articles.html',
+        description: 'Essays by Paul Graham',
+        item: items,
+    };
+};