gerbeur/api/test/lib/upload.test.ts

import "../setup.ts";
import { PNG } from "../helpers.ts";
import { assertEquals, assertThrows } from "@std/assert";
import { detectImageMime, validateImageUpload } from "../../lib/upload.ts";
import { APIException } from "../../lib/api-exception.ts";

Deno.test("detectImageMime: sniffs magic bytes, not names", () => {
  assertEquals(detectImageMime(PNG), "image/png");
  assertEquals(
    detectImageMime(new Uint8Array([0xff, 0xd8, 0xff, 0xe0])),
    "image/jpeg",
  );
  assertEquals(
    detectImageMime(new TextEncoder().encode("GIF89a")),
    "image/gif",
  );
  assertEquals(
    detectImageMime(new TextEncoder().encode("RIFF\0\0\0\0WEBPVP8 ")),
    "image/webp",
  );
  assertEquals(
    detectImageMime(new TextEncoder().encode("RIFF\0\0\0\0WAVEfmt ")),
    null,
  );
  assertEquals(
    detectImageMime(new TextEncoder().encode("<svg xmlns=...>")),
    null,
  );
  assertEquals(detectImageMime(new Uint8Array()), null);
});

Deno.test("validateImageUpload: rejects non-images and anything over 5 MB", () => {
  assertEquals(validateImageUpload(PNG), "image/png");
  assertThrows(
    () => validateImageUpload(new TextEncoder().encode("<html>")),
    APIException,
    "not a recognised image",
  );
  const big = new Uint8Array(5 * 1024 * 1024 + 1);
  big.set(PNG);
  assertThrows(() => validateImageUpload(big), APIException, "too large");
});