api/stream: split types.js into proxy.js and ffmpeg.js

api/src/stream/proxy.js

@@ -0,0 +1,43 @@
+import { Agent, request } from "undici";
+import { create as contentDisposition } from "content-disposition-header";
+
+import { destroyInternalStream } from "./manage.js";
+import { getHeaders, closeRequest, closeResponse, pipe } from "./shared.js";
+
+const defaultAgent = new Agent();
+
+export default async function (streamInfo, res) {
+    const abortController = new AbortController();
+    const shutdown = () => (
+        closeRequest(abortController),
+        closeResponse(res),
+        destroyInternalStream(streamInfo.urls)
+    );
+
+    try {
+        res.setHeader('Cross-Origin-Resource-Policy', 'cross-origin');
+        res.setHeader('Content-disposition', contentDisposition(streamInfo.filename));
+
+        const { body: stream, headers, statusCode } = await request(streamInfo.urls, {
+            headers: {
+                ...getHeaders(streamInfo.service),
+                Range: streamInfo.range
+            },
+            signal: abortController.signal,
+            maxRedirections: 16,
+            dispatcher: defaultAgent,
+        });
+
+        res.status(statusCode);
+
+        for (const headerName of ['accept-ranges', 'content-type', 'content-length']) {
+            if (headers[headerName]) {
+                res.setHeader(headerName, headers[headerName]);
+            }
+        }
+
+        pipe(stream, res, shutdown);
+    } catch {
+        shutdown();
+    }
+}