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38 lines
1.2 KiB
TypeScript
38 lines
1.2 KiB
TypeScript
import { describe, expect, it } from 'vitest'
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import {
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detectMimeFromSignature,
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validateFileSignature
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} from './file-signature'
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function bytes(values: number[]): Uint8Array {
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return Uint8Array.from(values)
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}
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describe('file signature detection', () => {
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it('detects JPEG', () => {
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const jpeg = bytes([0xFF, 0xD8, 0xFF, 0xE0, 0x00, 0x10])
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expect(detectMimeFromSignature(jpeg)).toBe('image/jpeg')
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expect(validateFileSignature('image/jpeg', jpeg)).toBe(true)
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})
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it('detects PNG', () => {
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const png = bytes([0x89, 0x50, 0x4E, 0x47, 0x0D, 0x0A, 0x1A, 0x0A, 0x00])
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expect(detectMimeFromSignature(png)).toBe('image/png')
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expect(validateFileSignature('image/png', png)).toBe(true)
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})
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it('detects WebP', () => {
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const webp = bytes([
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0x52, 0x49, 0x46, 0x46, 0x24, 0x00, 0x00, 0x00,
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0x57, 0x45, 0x42, 0x50
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])
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expect(detectMimeFromSignature(webp)).toBe('image/webp')
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expect(validateFileSignature('image/webp', webp)).toBe(true)
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})
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it('rejects mismatched mime and bytes', () => {
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const png = bytes([0x89, 0x50, 0x4E, 0x47, 0x0D, 0x0A, 0x1A, 0x0A, 0x00])
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expect(validateFileSignature('image/jpeg', png)).toBe(false)
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})
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})
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