refactor progress

packages/media_proxy_utils/src/ExternalMediaProxyUrlBuilder.tsx

@@ -0,0 +1,68 @@
+/*
+ * 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 {buildExternalMediaProxyPath} from '@fluxer/media_proxy_utils/src/ExternalMediaProxyPathCodec';
+import {createMediaProxySigner, type IMediaProxySigner} from '@fluxer/media_proxy_utils/src/MediaProxySigner';
+
+export interface ExternalMediaProxyUrlBuilderOptions {
+	mediaProxyEndpoint: string;
+	mediaProxySecretKey: string;
+}
+
+export interface IExternalMediaProxyUrlBuilder {
+	buildExternalMediaProxyUrl(inputUrl: string): string;
+}
+
+interface InternalExternalMediaProxyUrlBuilderOptions {
+	mediaProxyEndpoint: string;
+	mediaProxySigner: IMediaProxySigner;
+}
+
+function normalizeMediaProxyEndpoint(mediaProxyEndpoint: string): string {
+	return mediaProxyEndpoint.replace(/\/+$/u, '');
+}
+
+class ExternalMediaProxyUrlBuilder implements IExternalMediaProxyUrlBuilder {
+	private readonly mediaProxyEndpoint: string;
+	private readonly mediaProxySigner: IMediaProxySigner;
+
+	constructor(options: InternalExternalMediaProxyUrlBuilderOptions) {
+		this.mediaProxyEndpoint = options.mediaProxyEndpoint;
+		this.mediaProxySigner = options.mediaProxySigner;
+	}
+
+	buildExternalMediaProxyUrl(inputUrl: string): string {
+		const proxyUrlPath = buildExternalMediaProxyPath(inputUrl);
+		const signature = this.mediaProxySigner.createSignature(proxyUrlPath);
+		return `${this.mediaProxyEndpoint}/external/${signature}/${proxyUrlPath}`;
+	}
+}
+
+export function createExternalMediaProxyUrlBuilder(
+	options: ExternalMediaProxyUrlBuilderOptions,
+): IExternalMediaProxyUrlBuilder {
+	const mediaProxySigner = createMediaProxySigner({
+		mediaProxySecretKey: options.mediaProxySecretKey,
+	});
+
+	return new ExternalMediaProxyUrlBuilder({
+		mediaProxyEndpoint: normalizeMediaProxyEndpoint(options.mediaProxyEndpoint),
+		mediaProxySigner,
+	});
+}