Code refactoring and set up format selection

Set up format selection and archive download for next releases

server/src/core/streamer.ts

@@ -0,0 +1,39 @@
+import { stat, createReadStream } from 'fs';
+import { lookup } from 'mime-types';
+
+export function streamer(ctx: any, next: any) {
+    const filepath = '/Users/marco/dev/homebrew/yt-dlp-web-ui/downloads/AleXa (알렉사) – Voting Open in American Song Contest Grand Final!.webm'
+    stat(filepath, (err, stat) => {
+        if (err) {
+            ctx.response.status = 404;
+            ctx.body = { err: 'resource not found' };
+            next();
+        }
+        const fileSize = stat.size;
+        const range = ctx.headers.range;
+        if (range) {
+            const parts = range.replace(/bytes=/, '').split('-');
+            const start = parseInt(parts[0], 10);
+            const end = parts[1] ? parseInt(parts[1], 10) : fileSize - 1;
+            const chunksize = end - start + 1;
+            const file = createReadStream(filepath, { start, end });
+            const head = {
+                'Content-Range': `bytes ${start}-${end}/${fileSize}`,
+                'Accept-Ranges': 'bytes',
+                'Content-Length': chunksize,
+                'Content-Type': lookup(filepath)
+            };
+            ctx.res.writeHead(206, head);
+            file.pipe(ctx.res);
+            next();
+        } else {
+            const head = {
+                'Content-Length': fileSize,
+                'Content-Type': 'video/mp4'
+            };
+            ctx.res.writeHead(200, head);
+            createReadStream(ctx.params.filepath).pipe(ctx.res);
+            next();
+        }
+    });
+}