feat: add jian-ning blog (#5600)

Co-authored-by: Chang Lan <clan@eecs.berkeley.edu>

lib/routes/blogs/jianning.js

@@ -0,0 +1,45 @@
+const got = require('@/utils/got');
+const cheerio = require('cheerio');
+const iconv = require('iconv-lite');
+const url = require('url');
+
+module.exports = async (ctx) => {
+    const base_url = `http://jian-ning.com/all-articles.html`;
+    const response = await got({
+        method: 'get',
+        url: base_url,
+        responseType: 'buffer',
+    });
+    const data = iconv.decode(response.data, 'gbk');
+    const $ = cheerio.load(data);
+    const list = $('li');
+    const out = list
+        .map(async (i, item) => {
+            const link = url.resolve('http://jian-ning.com', $(item).find('a').attr('href'));
+            const description = await ctx.cache.tryGet(link, async () => {
+                const result = await got({
+                    method: 'get',
+                    url: link,
+                    responseType: 'buffer',
+                    headers: {
+                        Referer: base_url,
+                    },
+                });
+                const content = cheerio.load(iconv.decode(result.data, 'gbk'));
+                return content('td td').html();
+            });
+            const post = {
+                title: $(item).find('a').text(),
+                link: link,
+                pubDate: $(item).find('span').text(),
+                description: description,
+            };
+            return post;
+        })
+        .get();
+    ctx.state.data = {
+        title: $('head > title').text(),
+        link: base_url,
+        item: await Promise.all(out),
+    };
+};