feat(route): add Luogu user blog (#11527)

* feat(route): add Luogu user blog

* used html as description instead

* Do not set pubDate if there isn't any.

* used Luogu API

docs/programming.md

@@ -1013,6 +1013,10 @@ GitHub 官方也提供了一些 RSS:
 
 <Route author="solstice23" example="/luogu/user/feed/1" path="/luogu/user/feed/:uid" :paramsDesc="['用户 UID']" radar="1" rssbud="1"/>
 
+### 用户博客
+
+<Route author="ftiasch" example="/luogu/user/blog/ftiasch" path="/luogu/user/blog/:username" :paramsDesc="['用户名']" radar="1" rssbud="1"/>
+
 ## 码农俱乐部
 
 ### 话题

lib/v2/luogu/maintainer.js

@@ -2,4 +2,5 @@ module.exports = {
     '/contest': ['prnake'],
     '/daily/:id?': ['LogicJake ', 'prnake ', 'nczitzk'],
     '/user/feed/:uid': ['solstice23'],
+    '/user/blog/:username': ['ftiasch'],
 };

lib/v2/luogu/radar.js

@@ -20,6 +20,12 @@ module.exports = {
                 source: ['/user/:uid'],
                 target: '/luogu/user/feed/:uid',
             },
+            {
+                title: '用户博客',
+                docs: 'https://docs.rsshub.app/programming.html#luo-gu',
+                source: ['/blog/:username'],
+                target: '/luogu/user/blog/:username',
+            },
         ],
     },
 };

lib/v2/luogu/router.js

@@ -2,4 +2,5 @@ module.exports = (router) => {
     router.get('/contest', require('./contest'));
     router.get('/daily/:id?', require('./daily'));
     router.get('/user/feed/:uid', require('./userFeed'));
+    router.get('/user/blog/:username', require('./userBlog'));
 };

lib/v2/luogu/userBlog.js

@@ -0,0 +1,54 @@
+const got = require('@/utils/got');
+const cheerio = require('cheerio');
+
+module.exports = async (ctx) => {
+    const username = ctx.params.username;
+
+    // Convert from `username` to `uid`
+    const userApiUrl = `https://www.luogu.com.cn/api/user/search?keyword=${username}`;
+    const uid = await ctx.cache.tryGet(userApiUrl, async () => {
+        const rsp = await got(userApiUrl).json();
+        return rsp.users[0].uid;
+    });
+
+    // Get the title and link from the sitemap
+    const sitemapUrl = `https://www.luogu.com.cn/blog/${username}/_sitemap`;
+    const { title: blogTitle, link: blogBaseUrl } = await ctx.cache.tryGet(sitemapUrl, async () => {
+        const rsp = await got(sitemapUrl);
+        const $ = cheerio.load(rsp.data);
+        const title = $('title').text();
+        const link = $('.am-alert > a').attr('href');
+        return {
+            title,
+            link,
+        };
+    });
+
+    const posts = (await got(`https://www.luogu.com.cn/api/blog/lists?uid=${uid}`).json()).data.result.map((r) => ({
+        title: r.title,
+        link: `${blogBaseUrl}${r.identifier}`,
+        pubDate: new Date(r.postTime * 1000),
+    }));
+
+    // Get the full text
+    const item = await Promise.all(
+        posts.map((post) =>
+            ctx.cache.tryGet(post.link, async () => {
+                const rsp = await got.get(post.link);
+                const $ = cheerio.load(rsp.data);
+                return {
+                    title: post.title,
+                    link: post.link,
+                    pubDate: post.pubDate,
+                    description: $('#article-content').html(),
+                };
+            })
+        )
+    );
+
+    ctx.state.data = {
+        title: blogTitle,
+        link: blogBaseUrl,
+        item,
+    };
+};