support node.js environment

Author: YieldRay

.gitignore

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+node_modules/

package.json

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+{
+  "dependencies": {
+    "axios": "^0.26.1"
+  }
+}

test/develop.mjs

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+// 本地测试
+import http from 'http';
+import handler from './node.mjs';
+const port = process.env.PORT || 8000;
+console.log(`Listening on ${port}`);
+http.createServer(handler).listen(port);

test/node.mjs

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+import axios from 'axios';
+// 填入环境变量，或者修改下面的地址，这个地址应该返回一个文本文件，每行一个图片地址
+const recordURL = process.env.RECORD_URL || 'https://raw.githubusercontents.com/YieldRay/Random-Picture/master/url.csv';
+/**
+ * 有?json则返回json，否则如有?raw直接输出图像否则302跳转
+ * 优先获取123.jpg中的id，其次?id
+ * example:
+ * https://rand.deno.dev/?id=123
+ * https://rand.deno.dev/3.jpg
+ * https://rand.deno.dev/3.png?json
+ * https://rand.deno.dev/3.jpeg?raw
+ * https://rand.deno.dev/?raw
+ */
+
+const randomNum = (min, max) => Math.floor(Math.random() * (max - min + 1)) + min;
+const imagesArray = ['https://http.cat/503'];
+(async () => {
+    const text = await axios.get(recordURL).then(res => res.data);
+    console.log(text);
+    const imgs = text.split(/\r|\n|\r\n/);
+    imagesArray.splice(0, 1, ...imgs);
+})();
+
+export default async function (req /*: http.IncomingMessage*/, res /*: http.ServerResponse*/) {
+    const url = new URL('http://localhost' + req.url);
+    if (req.url === '/favicon.ico') {
+        res.writeHead(503);
+        res.end();
+        return;
+    }
+    const searchParams = new URLSearchParams(url.search);
+    let stringNumber; // 获取id
+    const matched = url.pathname.match(/^\/(\d+)\.(?:jpg|jpeg|png|gif|webp)$/);
+    if (matched) {
+        stringNumber = matched[1];
+    } else {
+        stringNumber = searchParams.get('id') ?? '';
+    }
+    let id = Number(stringNumber);
+    if (stringNumber.length === 0 || Number.isNaN(id)) {
+        id = randomNum(0, imagesArray.length - 1);
+    } else {
+        if (id < 0 || id >= imagesArray.length) id = randomNum(0, imagesArray.length - 1);
+    }
+    const remoteURL = imagesArray[id];
+    console.log(`send ${id} of ${imagesArray.length} with ${req.url}`);
+    // 调整发送格式json/raw/302
+    if (searchParams.has('json')) {
+        res.writeHead(200, { 'Content-Type': 'application/json', 'Access-Control-Allow-Origin': '*' });
+        res.write(JSON.stringify({ url: remoteURL }));
+        res.end();
+    } else if (searchParams.has('raw')) {
+        console.log(`send raw ${remoteURL}`);
+        const response = await axios({
+            method: 'get',
+            url: remoteURL,
+            responseType: 'stream',
+            headers: {
+                Referer: 'https://www.pixiv.net/',
+                'User-Agent': 'PixivIOSApp/6.7.1 (iOS 10.3.1; iPhone8,1)',
+            }, // 这个Header允许调用pixiv上面的图片
+        });
+        response.data.pipe(res);
+    } else {
+        res.writeHead(302, {
+            Location: remoteURL,
+        });
+        res.end();
+    }
+}