53 lines
2.3 KiB
TypeScript
53 lines
2.3 KiB
TypeScript
import { createHash, createHmac, randomUUID } from 'node:crypto';
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export interface ContentImageUploadResult {
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publicUrl: string;
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}
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export interface ContentImageUploadStore {
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upload(input: { filename: string; contentType: string; body: Buffer }): Promise<ContentImageUploadResult>;
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}
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export class RemoteContentImageStore implements ContentImageUploadStore {
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constructor(
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private readonly baseUrl: string,
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private readonly publicBaseUrl: string,
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private readonly secret: string,
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private readonly fetchImpl: typeof fetch = fetch,
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private readonly now: () => number = Date.now
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) {}
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async upload(input: { filename: string; contentType: string; body: Buffer }): Promise<ContentImageUploadResult> {
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if (!/^[a-f0-9]{32}\.(?:avif|webp|jpg|png|gif)$/.test(input.filename)) {
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throw new Error('Invalid content image filename.');
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}
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const pathname = `/v1/uploads/content/core2026/${input.filename}`;
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const expires = String(Math.floor(this.now() / 1000) + 60);
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const requestId = randomUUID();
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const digest = createHash('sha256').update(input.body).digest('hex');
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const signature = createHmac('sha256', this.secret)
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.update(`${expires}.${requestId}.${pathname}.${input.contentType}.${digest}`)
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.digest('hex');
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const response = await this.fetchImpl(`${this.baseUrl.replace(/\/$/, '')}${pathname}`, {
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method: 'PUT',
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headers: {
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'content-type': input.contentType,
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'x-image-client': 'core2026',
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'x-image-expires': expires,
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'x-image-request-id': requestId,
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'x-image-signature': signature,
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},
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body: new Uint8Array(input.body),
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});
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if (!response.ok) {
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throw new Error(`Image repository upload failed with HTTP ${response.status}.`);
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}
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const expectedPath = `uploads/core2026/${input.filename}`;
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const payload: unknown = await response.json();
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if (!payload || typeof payload !== 'object' || !('path' in payload) || payload.path !== expectedPath) {
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throw new Error('Image repository returned an unexpected content path.');
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}
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return { publicUrl: `${this.publicBaseUrl.replace(/\/$/, '')}/${input.filename}` };
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}
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}
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