掘金分类改为全文RSS，一次获取文章数改为5 (#444)

掘金的分类文章中站内文章获取全文，非站内文章保持摘要形式。全文做缓存，持续一天。

routes/juejin/category.js

@@ -1,4 +1,5 @@
 const axios = require('../../utils/axios');
+const cheerio = require('cheerio');
 const config = require('../../config');
 
 module.exports = async (ctx) => {
@@ -29,20 +30,50 @@ module.exports = async (ctx) => {
         },
     });
 
-    const data = response.data;
+    // const data = response.data;
+    let originalData = [];
+    if (response.data.d && response.data.d.entrylist) {
+        originalData = response.data.d && response.data.d.entrylist.slice(0, 5);
+    }
+    const resultItems = await Promise.all(
+        originalData.map(async (item) => {
+            const resultItem = {
+                title: item.title,
+                description: `${(item.content || item.summaryInfo || '无描述').replace(/[\x00-\x08\x0b-\x0c\x0e-\x1f\x7f]/g, '')}`,
+                pubDate: new Date(item.createdAt).toUTCString(),
+                link: item.originalUrl,
+            };
+            if (item.type === 'post') {
+                const key = 'juejin' + resultItem.link;
+                const value = await ctx.cache.get(key);
+
+                if (value) {
+                    resultItem.description = value;
+                } else {
+                    const detail = await axios({
+                        method: 'get',
+                        url: item.originalUrl,
+                        headers: {
+                            'User-Agent': config.ua,
+                            Referer: item.originalUrl,
+                        },
+                    });
+                    const content = cheerio.load(detail.data);
+                    resultItem.description = content('.article-content')
+                        .html()
+                        .replace(/[\x00-\x08\x0b-\x0c\x0e-\x1f\x7f]/g, '')
+                        .replace(/(<img.*?)(data-src)(.*?>)/g, '$1src$3');
+                    ctx.cache.set(key, resultItem.description, 24 * 60 * 60);
+                }
+            }
+            return Promise.resolve(resultItem);
+        })
+    );
 
     ctx.state.data = {
         title: `掘金${cat.name}`,
         link: `https://juejin.im/welcome/${category}`,
         description: `掘金${cat.name}`,
-        item:
-            data.d &&
-            data.d.entrylist &&
-            data.d.entrylist.map((item) => ({
-                title: item.title,
-                description: `${(item.content || item.summaryInfo || '无描述').replace(/[\x00-\x08\x0b-\x0c\x0e-\x1f\x7f]/g, '')}`,
-                pubDate: new Date(item.createdAt).toUTCString(),
-                link: item.originalUrl,
-            })),
+        item: resultItems,
     };
 };