DIYgod#289 Hexo Next theme RSS support (DIYgod#395)

* DIYgod#289 Hexo Next theme RSS support

* docs

* better title & description

* parese 5 article by default

README.md

@@ -187,6 +187,8 @@ RSSHub 是一个轻量、易于扩展的 RSS 生成器，可以给任何奇奇
     -   Release note
 -   推酷
     -   周刊
+-   Hexo
+    -   Next 主题
 -   小米
     -   众筹
 

docs/README.md

@@ -1548,6 +1548,16 @@ id, 专辑 id, 可在对应专辑页面的 URL 中找到
 | -------- | -------- | -------- | -------- |
 | prog     | design   | startup  | tech     |
 
+## Hexo
+
+### Next 主题
+
+举例：[http://rsshub.app/hexo/next/fengkx.top](http://rsshub.app/hexo/next/fengkx.top)
+
+路由： `/hexo/next/:url`
+
+参数： url 博客 Url 不带协议头
+
 ## 小米
 
 ### 众筹

router.js

@@ -354,6 +354,9 @@ router.get('/firefox/release/:platform', require('./routes/firefox/release'));
 // tuicool
 router.get('/tuicool/mags/:type', require('./routes/tuicool/mags'));
 
+// Hexo
+router.get('/hexo/next/:url', require('./routes/hexo/next'));
+
 // 小米
 router.get('/mi/crowdfunding', require('./routes/mi/crowdfunding'));
 

routes/hexo/next.js

@@ -0,0 +1,53 @@
+const cheerio = require('cheerio');
+const config = require('../../config');
+const axios = require('../../utils/axios');
+
+const axios_ins = axios.create({
+    headers: {
+        'User-Agent': config.ua,
+    },
+});
+
+module.exports = async (ctx) => {
+    const url = `http://${ctx.params.url}`;
+    const res = await axios_ins.get(`${url}/archives`);
+    const data = res.data;
+    const $ = cheerio.load(data);
+
+    const list = $('.post-header');
+
+    const count = [];
+    for (let i = 0; i < Math.min(list.length, 5); i++) {
+        count.push(i);
+    }
+    const out = await Promise.all(
+        count.map(async (i) => {
+            const each = $(list[i]);
+            const storyLink = each.find('.post-title-link').attr('href');
+            const item = {
+                title: each.find('[itemprop=name]').text(),
+                link: encodeURI(`${url}${storyLink}`),
+            };
+            const key = item.link;
+            const value = ctx.cache.get(key);
+
+            if (value) {
+                item.description = value;
+            } else {
+                const storyDeatil = await axios_ins.get(item.link);
+                const data = storyDeatil.data;
+                const $ = cheerio.load(data);
+                item.pubDate = $('time').attr('datetime');
+                item.description = $('.post-body').html();
+                ctx.cache.set(key, item.descriptio, 6 * 60 * 60);
+            }
+            return Promise.resolve(item);
+        })
+    );
+    ctx.state.data = {
+        title: $('.site-title').text(),
+        link: url,
+        description: $('[name=description]').attr('content'),
+        item: out,
+    };
+};