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feat(base64-file-converter): infer mime type from base64 signature

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Corentin Thomasset 2023-11-13 11:37:23 +01:00
parent f7f6f5d77f
commit b82787a470
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2 changed files with 68 additions and 9 deletions
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src/composable/downloadBase64.test.ts Normal file
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import { describe, expect, it } from 'vitest';
import { getMimeTypeFromBase64 } from './downloadBase64';
describe('downloadBase64', () => {
describe('getMimeTypeFromBase64', () => {
it('when the base64 string has a data URI, it returns the mime type', () => {
expect(getMimeTypeFromBase64({ base64String: 'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAUA' })).to.deep.equal({ mimeType: 'image/png' });
expect(getMimeTypeFromBase64({ base64String: 'data:image/jpg;base64,iVBORw0KGgoAAAANSUhEUgAAAAUA' })).to.deep.equal({ mimeType: 'image/jpg' });
});
it('when the base64 string has no data URI, it try to infer the mime type from the signature', () => {
// https://en.wikipedia.org/wiki/List_of_file_signatures
// PNG
expect(getMimeTypeFromBase64({ base64String: 'iVBORw0KGgoAAAANSUhEUgAAAAUA' })).to.deep.equal({ mimeType: 'image/png' });
// GIF
expect(getMimeTypeFromBase64({ base64String: 'R0lGODdh' })).to.deep.equal({ mimeType: 'image/gif' });
expect(getMimeTypeFromBase64({ base64String: 'R0lGODlh' })).to.deep.equal({ mimeType: 'image/gif' });
// JPG
expect(getMimeTypeFromBase64({ base64String: '/9j/' })).to.deep.equal({ mimeType: 'image/jpg' });
// PDF
expect(getMimeTypeFromBase64({ base64String: 'JVBERi0' })).to.deep.equal({ mimeType: 'application/pdf' });
});
it('when the base64 string has no data URI and no signature, it returns an undefined mimeType', () => {
expect(getMimeTypeFromBase64({ base64String: 'JVBERi' })).to.deep.equal({ mimeType: undefined });
});
});
});