add zhihu:zhuanlan

package.json

@@ -31,6 +31,7 @@
     "koa-router": "7.4.0",
     "lru-cache": "4.1.2",
     "path-to-regexp": "2.2.0",
+    "phantom": "^4.0.12",
     "readall": "1.0.0",
     "winston": "3.0.0-rc3"
   }

routes/zhihu/zhuanlan.js

@@ -0,0 +1,33 @@
+const phantom = require('phantom');
+const art = require('art-template');
+const path = require('path');
+const cheerio = require('cheerio');
+
+module.exports = async (ctx) => {
+    const id = ctx.params.id;
+
+    const instance = await phantom.create();
+    const page = await instance.createPage();
+    await page.on('onResourceRequested', function(requestData){});
+    await page.open(`https://zhuanlan.zhihu.com/${id}`);
+    const content = await page.property('content');
+    await instance.exit();
+
+    const $ = cheerio.load(content);
+    const list = $(".PostListItem");
+
+    ctx.body = art(path.resolve(__dirname, '../../views/rss.art'), {
+        title: $('title').text(),
+        link: `https://www.zhihu.com/collection/${id}`,
+        description: `知乎专栏-${$('title').text()}`,
+        lastBuildDate: new Date().toUTCString(),
+        item: list && list.map((index, item) => {
+            item = $(item);
+            return {
+                title: item.find('.PostListItem-title').text(),
+                description: `内容：${item.find('.PostListItem-summary').text()}`,
+                link: `https://zhuanlan.zhihu.com${item.find('.PostListItem-info a').attr('href')}`
+            };
+        }).get(),
+    });
+};