121 lines
4.0 KiB
TypeScript
121 lines
4.0 KiB
TypeScript
import "../setup.ts";
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import { PNG } from "../helpers.ts";
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import { assertEquals, assertThrows } from "@std/assert";
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import {
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detectImageMime,
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scalableImage,
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validateImageUpload,
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} from "../../lib/upload.ts";
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import { APIException } from "../../lib/api-exception.ts";
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Deno.test("detectImageMime: sniffs magic bytes, not names", () => {
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assertEquals(detectImageMime(PNG), "image/png");
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assertEquals(
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detectImageMime(new Uint8Array([0xff, 0xd8, 0xff, 0xe0])),
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"image/jpeg",
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);
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assertEquals(
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detectImageMime(new TextEncoder().encode("GIF89a")),
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"image/gif",
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);
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assertEquals(
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detectImageMime(new TextEncoder().encode("RIFF\0\0\0\0WEBPVP8 ")),
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"image/webp",
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);
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assertEquals(
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detectImageMime(new TextEncoder().encode("RIFF\0\0\0\0WAVEfmt ")),
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null,
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);
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assertEquals(
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detectImageMime(new TextEncoder().encode("<svg xmlns=...>")),
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null,
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);
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assertEquals(detectImageMime(new Uint8Array()), null);
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});
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Deno.test("validateImageUpload: rejects non-images and anything over 5 MB", () => {
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assertEquals(validateImageUpload(PNG), "image/png");
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assertThrows(
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() => validateImageUpload(new TextEncoder().encode("<html>")),
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APIException,
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"not a recognised image",
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);
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const big = new Uint8Array(5 * 1024 * 1024 + 1);
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big.set(PNG);
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assertThrows(() => validateImageUpload(big), APIException, "too large");
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});
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/** A JPEG's first bytes: SOI, then an EXIF segment stating `orientation`. */
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function jpegWithOrientation(orientation: number, little: boolean): Uint8Array {
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const u16 = (n: number) => little ? [n & 0xff, n >> 8] : [n >> 8, n & 0xff];
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const u32 = (n: number) => little ? [...u16(n), 0, 0] : [0, 0, ...u16(n)];
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const tiff = [
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...(little ? [0x49, 0x49] : [0x4d, 0x4d]),
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...u16(42),
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...u32(8),
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...u16(1),
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...u16(0x0112),
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...u16(3),
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...u32(1),
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...u16(orientation),
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...[0, 0],
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...u32(0),
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];
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const exif = [0x45, 0x78, 0x69, 0x66, 0, 0, ...tiff];
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const length = exif.length + 2;
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return new Uint8Array([
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...[0xff, 0xd8],
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// A JFIF segment first, as a camera's file may have.
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...[0xff, 0xe0, 0x00, 0x04, 0x00, 0x00],
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...[0xff, 0xe1, length >> 8, length & 0xff],
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...exif,
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...[0xff, 0xda],
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]);
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}
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Deno.test("scalableImage: a JPEG's EXIF orientation, upright without one", () => {
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const turn = (data: Uint8Array) => scalableImage(data)?.orientation;
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assertEquals(turn(jpegWithOrientation(6, false)), 6);
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assertEquals(turn(jpegWithOrientation(8, true)), 8);
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assertEquals(turn(jpegWithOrientation(42, true)), 1);
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assertEquals(turn(new Uint8Array([0xff, 0xd8, 0xff, 0xda, 0, 2])), 1);
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// Cut short of what it announces: upright, not an error.
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assertEquals(turn(jpegWithOrientation(6, false).subarray(0, 20)), 1);
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assertEquals(turn(PNG), 1);
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});
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Deno.test("scalableImage: an animated WebP and what isn't an image are served as they are", () => {
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const webp = (flags: number) =>
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new Uint8Array([
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...new TextEncoder().encode("RIFF\0\0\0\0WEBPVP8X"),
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...[10, 0, 0, 0],
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flags,
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]);
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assertEquals(scalableImage(webp(0x02)), null);
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// A reader without WebP gets a PNG of what may be transparent, a JPEG of
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// the rest.
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const still = { orientation: 1, animated: false };
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assertEquals(scalableImage(webp(0x10)), { ...still, compat: "png" });
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assertEquals(
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scalableImage(new TextEncoder().encode("RIFF\0\0\0\0WEBPVP8 ")),
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{ ...still, compat: "png" },
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);
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assertEquals(scalableImage(PNG), { ...still, compat: "png" });
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assertEquals(scalableImage(jpegWithOrientation(1, true)), {
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...still,
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compat: "jpg",
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});
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assertEquals(scalableImage(new TextEncoder().encode("BM-a-bitmap")), {
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...still,
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compat: "jpg",
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});
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// Only a GIF's frames are an animation to keep.
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assertEquals(scalableImage(new TextEncoder().encode("GIF89a")), {
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orientation: 1,
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animated: true,
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compat: "png",
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});
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assertEquals(scalableImage(new TextEncoder().encode("<svg/>")), null);
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assertEquals(scalableImage(new Uint8Array()), null);
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});
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