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Improved flexibility of XMP parsing #7274

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merged 4 commits into from Oct 6, 2023
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@radarhere radarhere commented Jul 10, 2023

Resolves #7273
Resolves #7324

The JPEG XMP code was originally added in #5144. The image in #7273 differs in that it is padded at the end with b"\x00". I've updated the JpegImagePlugin code to allow for that.

The image in #7273 also has an attribute name that doesn't contain a semicolon. Normally, the tags do, and leads to the start of the tag being surrounded with curly brackets. Their absence causes an error at the moment, so I've also added a commit to allow for that.

I created the test files by copying the XMP data from Tests/images/xmp_test.jpg, modifying it to trigger these conditions, and saving new images with a modified Pillow.

def test_getxmp_no_prefix(self):
with Image.open("Tests/images/xmp_no_prefix.jpg") as im:
if ElementTree is None:
with pytest.warns(UserWarning):
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Why is there a UserWarning?

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ElementTree is None if defusedxml is unavailable, triggering this warning.

Pillow/src/PIL/Image.py

Lines 1410 to 1411 in 1e7dcd3

if ElementTree is None:
warnings.warn("XMP data cannot be read without defusedxml dependency")

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OK, let's also add a match= to pytest.warns to make it a bit clearer (this and the other one).

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Sure, done, and I've added it to other locations as well.

@hugovk hugovk merged commit 8280fba into python-pillow:main Oct 6, 2023
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@radarhere radarhere deleted the jpeg_xmp branch October 6, 2023 07:45
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