remove EXIF information from PNG, JPEG and WebP images
jsr.io/@mary/exif-rm
typescript
jsr
chore: use imagemagick to verify exif data
+141
-5
+141
-5
test.ts
+141
-5
test.ts
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import { assert } from 'jsr:@std/assert';
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import { assert, assertEquals } from 'jsr:@std/assert';
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import { remove } from './mod.ts';
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const identify = (() => {
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const decoder = new TextDecoder('utf-8');
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const command = new Deno.Command('identify', {
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args: ['-regard-warnings', '-format', '%[EXIF:*]', '-'],
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stdin: 'piped',
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stdout: 'piped',
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stderr: 'piped',
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});
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return async (image: Uint8Array) => {
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const process = command.spawn();
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{
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const writer = process.stdin.getWriter();
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await writer.write(image);
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await writer.close();
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}
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const { code, stdout, stderr } = await process.output();
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if (code !== 0) {
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throw new Error(`exit code ${code}\n${decoder.decode(stderr)}`);
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}
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const text = decoder.decode(stdout);
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const lines = text.split('\n').filter((line) => line.length > 0);
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const fields = lines.map((line) => {
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const [key, ...rest] = line.split('=');
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const value = rest.join('=');
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return [key, value];
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});
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return Object.fromEntries(fields);
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};
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})();
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Deno.test('removes EXIF from JPEG files', async () => {
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const image = await Deno.readFile('./samples/sample.jpg');
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// Verify the original image has EXIF data
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assertEquals(await identify(image), {
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'exif:ApertureValue': '368640/65536',
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'exif:ColorSpace': '1',
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'exif:ComponentsConfiguration': '...',
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'exif:CustomRendered': '0',
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'exif:DateTime': '2008:07:31 10:38:11',
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'exif:DateTimeDigitized': '2008:05:30 15:56:01',
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'exif:DateTimeOriginal': '2008:05:30 15:56:01',
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'exif:ExifOffset': '214',
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'exif:ExifVersion': '0221',
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'exif:ExposureBiasValue': '0/1',
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'exif:ExposureMode': '1',
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'exif:ExposureProgram': '1',
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'exif:ExposureTime': '1/160',
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'exif:FNumber': '71/10',
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'exif:Flash': '9',
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'exif:FlashPixVersion': '0100',
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'exif:FocalLength': '135/1',
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'exif:FocalPlaneResolutionUnit': '2',
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'exif:FocalPlaneXResolution': '3888000/876',
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'exif:FocalPlaneYResolution': '2592000/583',
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'exif:GPSInfo': '978',
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'exif:GPSVersionID': '....',
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'exif:InteroperabilityOffset': '948',
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'exif:Make': 'Canon',
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'exif:MeteringMode': '5',
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'exif:Model': 'Canon EOS 40D',
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'exif:Orientation': '1',
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'exif:PhotographicSensitivity': '100',
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'exif:PixelXDimension': '100',
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'exif:PixelYDimension': '68',
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'exif:ResolutionUnit': '2',
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'exif:SceneCaptureType': '0',
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'exif:ShutterSpeedValue': '483328/65536',
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'exif:Software': 'GIMP 2.4.5',
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'exif:SubSecTime': '00',
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'exif:SubSecTimeDigitized': '00',
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'exif:SubSecTimeOriginal': '00',
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'exif:UserComment': '',
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'exif:WhiteBalance': '0',
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'exif:XResolution': '72/1',
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'exif:YCbCrPositioning': '2',
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'exif:YResolution': '72/1',
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'exif:thumbnail:Compression': '6',
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'exif:thumbnail:InteroperabilityIndex': 'R98',
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'exif:thumbnail:InteroperabilityVersion': '0100',
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'exif:thumbnail:JPEGInterchangeFormat': '1090',
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'exif:thumbnail:JPEGInterchangeFormatLength': '1378',
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'exif:thumbnail:ResolutionUnit': '2',
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'exif:thumbnail:XResolution': '72/1',
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'exif:thumbnail:YResolution': '72/1',
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});
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const exifRemoved = remove(image);
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assert(exifRemoved != null);
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assert(exifRemoved.byteLength === 5480);
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// Verify the image has no EXIF data
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assert(exifRemoved !== null);
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assertEquals(await identify(exifRemoved), {});
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});
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Deno.test('removes EXIF from PNG files', async () => {
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const image = await Deno.readFile('./samples/sample.png');
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// Verify the original image has EXIF data
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assertEquals(await identify(image), {
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'exif:ApertureValue': '45/8',
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'exif:ColorSpace': '1',
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'exif:ComponentsConfiguration': '...',
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'exif:CustomRendered': '0',
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'exif:DateTime': '2008:07:31 10:38:11',
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'exif:DateTimeDigitized': '2008:05:30 15:56:01',
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'exif:DateTimeOriginal': '2008:05:30 15:56:01',
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'exif:ExifOffset': '190',
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'exif:ExifVersion': '0221',
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'exif:ExposureBiasValue': '0/1',
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'exif:ExposureMode': '1',
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'exif:ExposureProgram': '1',
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'exif:ExposureTime': '1/160',
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'exif:FNumber': '71/10',
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'exif:Flash': '9',
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'exif:FlashPixVersion': '0100',
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'exif:FocalLength': '135/1',
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'exif:FocalPlaneResolutionUnit': '2',
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'exif:FocalPlaneXResolution': '324000/73',
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'exif:FocalPlaneYResolution': '2592000/583',
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'exif:Make': 'Canon',
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'exif:MeteringMode': '5',
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'exif:Model': 'Canon EOS 40D',
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'exif:Orientation': '1',
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'exif:PhotographicSensitivity': '100',
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'exif:PixelXDimension': '100',
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'exif:PixelYDimension': '68',
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'exif:ResolutionUnit': '2',
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'exif:SceneCaptureType': '0',
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'exif:ShutterSpeedValue': '59/8',
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'exif:Software': 'GIMP 2.4.5',
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'exif:SubSecTime': '00',
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'exif:SubSecTimeDigitized': '00',
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'exif:SubSecTimeOriginal': '00',
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'exif:WhiteBalance': '0',
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'exif:XResolution': '72/1',
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'exif:YResolution': '72/1',
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});
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const exifRemoved = remove(image);
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assert(exifRemoved != null);
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assert(exifRemoved.byteLength === 17638);
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// Verify the image has no EXIF data
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assert(exifRemoved !== null);
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assertEquals(await identify(exifRemoved), {});
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});