refactor: Download API

Now the download APIs are moved into a new file

backend/src/restful/download.js

@@ -0,0 +1,129 @@
+import { getPlatformFromHeaders } from '@/utils/platform';
+import { COLLECTIONS_KEY, SUBS_KEY } from './constants';
+import { getFlowHeaders } from '@/utils/flow';
+import { produceArtifact } from './artifacts';
+import $ from '@/core/app';
+
+export default function register($app) {
+    $app.get('/download/collection/:name', downloadCollection);
+    $app.get('/download/:name', downloadSubscription);
+}
+
+async function downloadSubscription(req, res) {
+    let { name } = req.params;
+    name = decodeURIComponent(name);
+
+    const raw = req.query.raw || false;
+    const platform =
+        req.query.target || getPlatformFromHeaders(req.headers) || 'JSON';
+
+    $.info(`正在下载订阅：${name}`);
+
+    const allSubs = $.read(SUBS_KEY);
+    const sub = allSubs[name];
+    if (sub) {
+        try {
+            const output = await produceArtifact({
+                type: 'subscription',
+                item: sub,
+                platform,
+                noProcessor: raw,
+            });
+
+            if (sub.source !== 'local') {
+                // forward flow headers
+                const flowInfo = await getFlowHeaders(sub.url);
+                if (flowInfo) {
+                    res.set('subscription-userinfo', flowInfo);
+                }
+            }
+
+            if (platform === 'JSON') {
+                res.set('Content-Type', 'application/json;charset=utf-8').send(
+                    output,
+                );
+            } else {
+                res.send(output);
+            }
+        } catch (err) {
+            $.notify(
+                `🌍 『 𝑺𝒖𝒃-𝑺𝒕𝒐𝒓𝒆 』 下载订阅失败`,
+                `❌ 无法下载订阅：${name}！`,
+                `🤔 原因：${JSON.stringify(err)}`,
+            );
+            $.error(JSON.stringify(err));
+            res.status(500).json({
+                status: 'failed',
+                message: err,
+            });
+        }
+    } else {
+        $.notify(`🌍 『 𝑺𝒖𝒃-𝑺𝒕𝒐𝒓𝒆 』 下载订阅失败`, `❌ 未找到订阅：${name}！`);
+        res.status(404).json({
+            status: 'failed',
+        });
+    }
+}
+
+async function downloadCollection(req, res) {
+    let { name } = req.params;
+    name = decodeURIComponent(name);
+
+    const { raw } = req.query || 'false';
+    const platform =
+        req.query.target || getPlatformFromHeaders(req.headers) || 'JSON';
+
+    const allCollections = $.read(COLLECTIONS_KEY);
+    const collection = allCollections[name];
+
+    $.info(`正在下载组合订阅：${name}`);
+
+    // forward flow header from the first subscription in this collection
+    const allSubs = $.read(SUBS_KEY);
+    const subs = collection['subscriptions'];
+    if (subs.length > 0) {
+        const sub = allSubs[subs[0]];
+        if (sub.source !== 'local') {
+            const flowInfo = await getFlowHeaders(sub.url);
+            if (flowInfo) {
+                res.set('subscription-userinfo', flowInfo);
+            }
+        }
+    }
+
+    if (collection) {
+        try {
+            const output = await produceArtifact({
+                type: 'collection',
+                item: collection,
+                platform,
+                noProcessor: raw,
+            });
+            if (platform === 'JSON') {
+                res.set('Content-Type', 'application/json;charset=utf-8').send(
+                    output,
+                );
+            } else {
+                res.send(output);
+            }
+        } catch (err) {
+            $.notify(
+                `🌍 『 𝑺𝒖𝒃-𝑺𝒕𝒐𝒓𝒆 』 下载组合订阅失败`,
+                `❌ 下载组合订阅错误：${name}！`,
+                `🤔 原因：${err}`,
+            );
+            res.status(500).json({
+                status: 'failed',
+                message: err,
+            });
+        }
+    } else {
+        $.notify(
+            `🌍 『 𝑺𝒖𝒃-𝑺𝒕𝒐𝒓𝒆 』 下载组合订阅失败`,
+            `❌ 未找到组合订阅：${name}！`,
+        );
+        res.status(404).json({
+            status: 'failed',
+        });
+    }
+}