feat: initial fluxer codebase import

fluxer_media_proxy/src/lib/HttpUtils.ts

@@ -0,0 +1,67 @@
+/*
+ * Copyright (C) 2026 Fluxer Contributors
+ *
+ * This file is part of Fluxer.
+ *
+ * Fluxer is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Fluxer is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with Fluxer. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+import type {Context} from 'hono';
+
+export const parseRange = (rangeHeader: string | null, fileSize: number) => {
+	if (!rangeHeader) return null;
+	const matches = rangeHeader.match(/bytes=(\d*)-(\d*)/);
+	if (!matches) return null;
+
+	const start = matches[1] ? Number.parseInt(matches[1], 10) : 0;
+	const end = matches[2] ? Number.parseInt(matches[2], 10) : fileSize - 1;
+
+	return start >= fileSize || end >= fileSize || start > end ? null : {start, end};
+};
+
+export const setHeaders = (
+	ctx: Context,
+	size: number,
+	contentType: string,
+	range: {start: number; end: number} | null,
+	lastModified?: Date,
+) => {
+	const isStreamableMedia = contentType.startsWith('video/') || contentType.startsWith('audio/');
+
+	const headers = {
+		'Accept-Ranges': 'bytes',
+		'Access-Control-Allow-Origin': '*',
+		'Cache-Control': isStreamableMedia
+			? 'public, max-age=31536000, no-transform, immutable'
+			: 'public, max-age=31536000',
+		'Content-Type': contentType,
+		Date: new Date().toUTCString(),
+		Expires: new Date(Date.now() + 31536000000).toUTCString(),
+		'Last-Modified': lastModified?.toUTCString() ?? new Date().toUTCString(),
+		Vary: 'Accept-Encoding, Range',
+	};
+
+	Object.entries(headers).forEach(([k, v]) => {
+		ctx.header(k, v);
+	});
+
+	if (range) {
+		const length = range.end - range.start + 1;
+		ctx.status(206);
+		ctx.header('Content-Length', length.toString());
+		ctx.header('Content-Range', `bytes ${range.start}-${range.end}/${size}`);
+	} else {
+		ctx.header('Content-Length', size.toString());
+	}
+};