refactor progress

packages/media_proxy_utils/src/MediaProxyUtils.tsx

@@ -0,0 +1,54 @@
+/*
+ * 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 crypto from 'node:crypto';
+import {createExternalMediaProxyUrlBuilder} from '@fluxer/media_proxy_utils/src/ExternalMediaProxyUrlBuilder';
+
+const BASE64_URL_REGEX = /=*$/;
+
+export function createSignature(inputString: string, mediaProxySecretKey: string): string {
+	const hmac = crypto.createHmac('sha256', mediaProxySecretKey);
+	hmac.update(inputString);
+	return hmac.digest('base64url').replace(BASE64_URL_REGEX, '');
+}
+
+export function verifySignature(proxyUrlPath: string, providedSignature: string, mediaProxySecretKey: string): boolean {
+	const expectedSignature = createSignature(proxyUrlPath, mediaProxySecretKey);
+	const expectedBuffer = Buffer.from(expectedSignature);
+	const providedBuffer = Buffer.from(providedSignature);
+	if (expectedBuffer.length !== providedBuffer.length) {
+		return false;
+	}
+	return crypto.timingSafeEqual(expectedBuffer, providedBuffer);
+}
+
+export interface ExternalMediaProxyURLOptions {
+	inputURL: string;
+	mediaProxyEndpoint: string;
+	mediaProxySecretKey: string;
+}
+
+export function getExternalMediaProxyURL(options: ExternalMediaProxyURLOptions): string {
+	const builder = createExternalMediaProxyUrlBuilder({
+		mediaProxyEndpoint: options.mediaProxyEndpoint,
+		mediaProxySecretKey: options.mediaProxySecretKey,
+	});
+
+	return builder.buildExternalMediaProxyUrl(options.inputURL);
+}