feat: add lwn.net security alerts (#2491)

docs/programming.md

@@ -172,6 +172,36 @@ GitHub 官方也提供了一些 RSS:
 
 <Route author="ysc3839" example="/patchwork.kernel.org/comments/10723629" path="/patchwork.kernel.org/comments/:id" :paramsDesc="['Patch ID']"/>
 
+## LWN.net
+
+### Security alerts
+
+<Route author="zengxs" example="/lwn/alerts/CentOS" path="/lwn/alerts/:distributor" :paramsDesc="['对应发行版标识']">
+
+| 发行版           | 标识               |
+| :--------------- | :----------------- |
+| Arch Linux       | `Arch_Linux`       |
+| CentOS           | `CentOS`           |
+| Debian           | `Debian`           |
+| Fedora           | `Fedora`           |
+| Gentoo           | `Gentoo`           |
+| Mageia           | `Mageia`           |
+| openSUSE         | `openSUSE`         |
+| Oracle           | `Oracle`           |
+| Red Hat          | `Red_Hat`          |
+| Scientific Linux | `Scientific_Linux` |
+| Slackware        | `Slackware`        |
+| SUSE             | `SUSE`             |
+| Ubuntu           | `Ubuntu`           |
+
+::: tip 提示
+
+注意标识大小写
+
+:::
+
+</Route>
+
 ## segmentfault
 
 ### 频道

lib/router.js

@@ -1439,4 +1439,7 @@ router.get('/8btc/:authorid', require('./routes/8btc/author'));
 // VueVlog
 router.get('/vuevideo/:userid', require('./routes/vuevideo/user'));
 
+// LWN.net Alerts
+router.get('/lwn/alerts/:distributor', require('./routes/lwn/alerts'));
+
 module.exports = router;

lib/routes/lwn/alerts.js

@@ -0,0 +1,57 @@
+const url = require('url');
+const got = require('@/utils/got');
+const date = require('@/utils/date');
+const cheerio = require('cheerio');
+
+module.exports = async (ctx) => {
+    const distributor = ctx.params.distributor;
+    const listUrl = `https://lwn.net/Alerts/${distributor}/`;
+    const res = await got({
+        method: 'get',
+        url: listUrl,
+    });
+    const $ = cheerio.load(res.data);
+    const title = $('.PageHeadline').text();
+    const list = $('.ArticleText').find('table tbody tr:not(:first-of-type)');
+    const count = [];
+    for (let i = 0; i < list.length; i++) {
+        count.push(i);
+    }
+    const resultItem = await Promise.all(
+        count.map(async (i) => {
+            const each = $(list[i]);
+            const originalUrl = each.find('td > a').attr('href');
+            const link = url.resolve('https://lwn.net', originalUrl);
+            const pubDate = date(each.find('td:nth-of-type(3)').text());
+
+            const cacheKey = `LWN.net:${link}`;
+            const cacheValue = await ctx.cache.get(cacheKey);
+
+            let item;
+            if (cacheValue) {
+                item = JSON.parse(cacheValue);
+            } else {
+                const detail = await got({
+                    method: 'get',
+                    url: link,
+                });
+                const content = cheerio.load(detail.data);
+                item = {
+                    title: content('.PageHeadline').text(),
+                    description: content('.ArticleText').html(),
+                    link: link,
+                    pubDate: pubDate,
+                };
+                ctx.cache.set(cacheKey, JSON.stringify(item));
+            }
+
+            return Promise.resolve(item);
+        })
+    );
+
+    ctx.state.data = {
+        title: title,
+        link: listUrl,
+        item: resultItem,
+    };
+};