55 lines
2.0 KiB
TypeScript
55 lines
2.0 KiB
TypeScript
/*
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* Copyright (C) 2026 Fluxer Contributors
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*
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* This file is part of Fluxer.
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*
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* Fluxer is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Fluxer is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with Fluxer. If not, see <https://www.gnu.org/licenses/>.
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*/
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import crypto from 'node:crypto';
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import {createExternalMediaProxyUrlBuilder} from '@fluxer/media_proxy_utils/src/ExternalMediaProxyUrlBuilder';
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const BASE64_URL_REGEX = /=*$/;
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export function createSignature(inputString: string, mediaProxySecretKey: string): string {
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const hmac = crypto.createHmac('sha256', mediaProxySecretKey);
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hmac.update(inputString);
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return hmac.digest('base64url').replace(BASE64_URL_REGEX, '');
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}
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export function verifySignature(proxyUrlPath: string, providedSignature: string, mediaProxySecretKey: string): boolean {
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const expectedSignature = createSignature(proxyUrlPath, mediaProxySecretKey);
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const expectedBuffer = Buffer.from(expectedSignature);
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const providedBuffer = Buffer.from(providedSignature);
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if (expectedBuffer.length !== providedBuffer.length) {
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return false;
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}
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return crypto.timingSafeEqual(expectedBuffer, providedBuffer);
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}
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export interface ExternalMediaProxyURLOptions {
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inputURL: string;
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mediaProxyEndpoint: string;
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mediaProxySecretKey: string;
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}
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export function getExternalMediaProxyURL(options: ExternalMediaProxyURLOptions): string {
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const builder = createExternalMediaProxyUrlBuilder({
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mediaProxyEndpoint: options.mediaProxyEndpoint,
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mediaProxySecretKey: options.mediaProxySecretKey,
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});
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return builder.buildExternalMediaProxyUrl(options.inputURL);
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}
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