增加：nhentai (#983)

docs/README.md

@@ -2079,3 +2079,8 @@ IATA 国际航空运输协会机场代码, 参见[维基百科 国际航空运
 ### 油价
 
 <route name="今日油价" author="xyqfer" example="/oilprice/shanghai" path="/oilprice/:area" :paramsDesc="['地区拼音，详见[成品油价格网](http://oil.usd-cny.com/)']"/>
+
+### nHentai
+
+<route name="分类筛选" author="MegrezZhu" example="/nhentai/language/chinese" path="/nhentai/:key/:keyword" :paramsDesc="['筛选条件，可选: parody, character, tag, artist, group, language, category','筛选值']" />
+<route name="高级搜索" author="MegrezZhu" example="/nhentai/search/translated" path="/nhentai/search/:keyword" :paramsDesc="['用于搜索的关键词，用法详见[官网](https://nhentai.net/info/)']" />

router.js

@@ -706,4 +706,8 @@ router.get('/youku/channel/:channelId/:embed?', require('./routes/youku/channel'
 // 油价
 router.get('/oilprice/:area', require('./routes/oilprice'));
 
+// nHentai
+router.get('/nhentai/search/:keyword', require('./routes/nhentai/search'));
+router.get('/nhentai/:key/:keyword', require('./routes/nhentai/other'));
+
 module.exports = router;

routes/nhentai/other.js

@@ -0,0 +1,23 @@
+const { getList, getDetailWithCache } = require('./util');
+
+const supportedKeys = ['parody', 'character', 'tag', 'artist', 'group', 'language', 'category'];
+
+module.exports = async (ctx) => {
+    const { keyword, key } = ctx.params;
+    if (supportedKeys.indexOf(key) === -1) {
+        ctx.state.data = {
+            title: 'nHentai - unsupported',
+        };
+        return;
+    }
+
+    const list = await getList(`https://nhentai.net/${key}/${keyword.toLowerCase().replace(' ', '-')}`);
+    const details = await Promise.all(list.map(getDetailWithCache.bind(null, ctx.cache)));
+
+    ctx.state.data = {
+        title: `nHentai - ${key} - ${keyword}`,
+        link: 'https://nhentai.net',
+        description: 'hentai',
+        item: details,
+    };
+};

routes/nhentai/search.js

@@ -0,0 +1,14 @@
+const { getList, getDetailWithCache } = require('./util');
+
+module.exports = async (ctx) => {
+    const { keyword } = ctx.params;
+    const list = await getList(`https://nhentai.net/search/?q=${keyword}`);
+    const details = await Promise.all(list.map(getDetailWithCache.bind(null, ctx.cache)));
+
+    ctx.state.data = {
+        title: `nHentai - search - ${keyword}`,
+        link: 'https://nhentai.net',
+        description: 'hentai',
+        item: details,
+    };
+};

routes/nhentai/util.js

@@ -0,0 +1,66 @@
+const { resolve } = require('url');
+const cheerio = require('cheerio');
+const axios = require('../../utils/axios');
+
+exports.getList = async (url) => {
+    const { data } = await axios.get(url);
+    const $ = cheerio.load(data);
+
+    return $('.gallery a.cover')
+        .map((_, ele) => createResult($, ele))
+        .get();
+};
+
+exports.getDetail = async (url) => {
+    const { data } = await axios.get(url);
+    const $ = cheerio.load(data);
+
+    // thumb to high-quality
+    let galleryThumbs = $('.gallerythumb img')
+        .map((_, ele) => resolve('https://nhentai.net', $(ele).attr('data-src')))
+        .get();
+    galleryThumbs = galleryThumbs.map((src) => src.replace(/(.+)(\d+)t\.(.+)/, (_, p1, p2, p3) => `${p1}${p2}.${p3}`));
+    galleryThumbs = galleryThumbs.map((src) => src.replace('t.nhentai.net', 'i.nhentai.net'));
+
+    const renderImg = (src) => `<img referrerpolicy="no-referrer" src="${src}" />`;
+    return {
+        pubDate: new Date($('time').attr('datetime')).toUTCString(),
+        guid: `full:${url}`,
+        description: `
+            <h1>${galleryThumbs.length} pages</h1>
+            ${galleryThumbs.map(renderImg).join('')}
+        `.trim(),
+    };
+};
+
+exports.getDetailWithCache = async (cache, info) => {
+    const cached = await cache.get(`full:${info.link}`);
+    if (cached) {
+        return {
+            ...info,
+            ...cached,
+        };
+    } else {
+        const detail = await exports.getDetail(info.link);
+        cache.set(`full:${info.link}`, detail);
+        return {
+            ...info,
+            ...detail,
+        };
+    }
+};
+
+function createResult($, ele) {
+    const link = resolve('https://nhentai.net', $(ele).attr('href'));
+    const thumbImg = $(ele).children('img');
+    const thumbSrc = thumbImg.attr('data-src') || thumbImg.attr('src');
+    return {
+        title: $(ele)
+            .children('.caption')
+            .text(),
+        link,
+        guid: link,
+        pubDate: new Date().toUTCString(), // 要获得准确时间需要对每个本子都请求一遍，很麻烦
+        description: `<img referrerpolicy="no-referrer" src="${thumbSrc.replace('thumb', 'cover')}" />`,
+    };
+}