58 lines
1.7 KiB
TypeScript
58 lines
1.7 KiB
TypeScript
import type { Context } from "@oak/oak";
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export const UPLOADS_DIR = "api/uploads";
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export const DUMPS_DIR = `${UPLOADS_DIR}/dumps`;
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export const AVATARS_DIR = `${UPLOADS_DIR}/avatars`;
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export const PLAYLIST_IMAGES_DIR = `${UPLOADS_DIR}/playlist-images`;
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export const MAX_IMAGE_SIZE = 5 * 1024 * 1024; // 5 MB
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export const ALLOWED_IMAGE_MIMES = new Set([
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"image/jpeg",
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"image/png",
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"image/gif",
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"image/webp",
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]);
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/** Detect image MIME type from magic bytes, ignoring the browser-declared type. */
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export function detectImageMime(data: Uint8Array): string | null {
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if (data[0] === 0xFF && data[1] === 0xD8 && data[2] === 0xFF) {
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return "image/jpeg";
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}
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if (
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data[0] === 0x89 && data[1] === 0x50 && data[2] === 0x4E && data[3] === 0x47
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) return "image/png";
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if (
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data[0] === 0x47 && data[1] === 0x49 && data[2] === 0x46 && data[3] === 0x38
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) return "image/gif";
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// RIFF....WEBP
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if (
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data[0] === 0x52 && data[1] === 0x49 && data[2] === 0x46 &&
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data[3] === 0x46 &&
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data[8] === 0x57 && data[9] === 0x45 && data[10] === 0x42 &&
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data[11] === 0x50
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) return "image/webp";
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return null;
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}
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export async function serveUploadedFile(
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ctx: Context,
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filePath: string,
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mime: string,
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cacheMaxAge = 3600,
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): Promise<boolean> {
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let data: Uint8Array;
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try {
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data = await Deno.readFile(filePath);
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} catch {
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ctx.response.status = 404;
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return false;
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}
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ctx.response.headers.set("Content-Type", mime);
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ctx.response.headers.set("Content-Disposition", "inline");
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ctx.response.headers.set("Cache-Control", `public, max-age=${cacheMaxAge}`);
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ctx.response.headers.set("Cross-Origin-Resource-Policy", "cross-origin");
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ctx.response.body = data;
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return true;
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}
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