62 lines
2.0 KiB
TypeScript
62 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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const BASE64_URL_PADDING_REGEX = /=*$/;
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export interface MediaProxySignerOptions {
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mediaProxySecretKey: string;
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}
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export interface IMediaProxySigner {
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createSignature(proxyUrlPath: string): string;
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verifySignature(proxyUrlPath: string, providedSignature: string): boolean;
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}
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class MediaProxySigner implements IMediaProxySigner {
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private readonly mediaProxySecretKey: string;
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constructor(options: MediaProxySignerOptions) {
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this.mediaProxySecretKey = options.mediaProxySecretKey;
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}
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createSignature(proxyUrlPath: string): string {
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const hmac = crypto.createHmac('sha256', this.mediaProxySecretKey);
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hmac.update(proxyUrlPath);
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return hmac.digest('base64url').replace(BASE64_URL_PADDING_REGEX, '');
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}
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verifySignature(proxyUrlPath: string, providedSignature: string): boolean {
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const expectedSignature = this.createSignature(proxyUrlPath);
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const expectedBuffer = Buffer.from(expectedSignature, 'utf8');
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const providedBuffer = Buffer.from(providedSignature, 'utf8');
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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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}
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export function createMediaProxySigner(options: MediaProxySignerOptions): IMediaProxySigner {
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return new MediaProxySigner(options);
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}
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