Require Pillow >= 10.0.1 and drop shims for older versions

docs/release_notes.rst

@@ -28,6 +28,13 @@ tagged yet.
 
 .. |OCRmyPDF PyPI| image:: https://img.shields.io/pypi/v/ocrmypdf.svg
 
+v15.1.0
+=======
+
+-  We now require Pillow 10.0.1, due a serious security vulnerability in all earlier
+   versions of that dependency. The vulnerability concerns WebP images and could
+   be triggered in OCRmyPDF when creating a PDF from a malicious WebP image.
+
 v15.0.2
 =======
 

pyproject.toml

@@ -12,7 +12,7 @@ readme = "README.md"
 license = { text = "MPL-2.0" }
 requires-python = ">=3.9"
 dependencies = [
-  "Pillow>=9.0.1",
+  "Pillow>=10.0.1",
   "deprecation>=2.1.0",
   "img2pdf>=0.4.4",
   "packaging>=20",

src/ocrmypdf/_exec/ghostscript.py

@@ -20,14 +20,6 @@ from ocrmypdf.exceptions import SubprocessOutputError
 from ocrmypdf.helpers import Resolution
 from ocrmypdf.subprocess import get_version, run, run_polling_stderr
 
-# Remove this workaround when we require Pillow >= 10
-try:
-    Transpose = Image.Transpose  # type: ignore
-except AttributeError:
-    # Pillow 9 shim
-    Transpose = Image  # type: ignore
-
-
 COLOR_CONVERSION_STRATEGIES = frozenset(
     [
         'CMYK',
@@ -137,11 +129,11 @@ def rasterize_pdf(
                 # rotation is a clockwise angle and Image.ROTATE_* is
                 # counterclockwise so this cancels out the rotation
                 if rotation == 90:
-                    im = im.transpose(Transpose.ROTATE_90)
+                    im = im.transpose(Image.Transpose.ROTATE_90)
                 elif rotation == 180:
-                    im = im.transpose(Transpose.ROTATE_180)
+                    im = im.transpose(Image.Transpose.ROTATE_180)
                 elif rotation == 270:
-                    im = im.transpose(Transpose.ROTATE_270)
+                    im = im.transpose(Image.Transpose.ROTATE_270)
                 if rotation % 180 == 90:
                     page_dpi = page_dpi.flip_axis()
             im.save(fspath(output_file), dpi=page_dpi)

src/ocrmypdf/_pipeline.py

@@ -41,13 +41,6 @@ from ocrmypdf.pdfa import generate_pdfa_ps
 from ocrmypdf.pdfinfo import Colorspace, Encoding, PageInfo, PdfInfo
 from ocrmypdf.pluginspec import OrientationConfidence
 
-# Remove this workaround when we require Pillow >= 10
-try:
-    BICUBIC = Image.Resampling.BICUBIC  # type: ignore
-except AttributeError:  # pragma: no cover
-    # Pillow 9 shim
-    BICUBIC = Image.BICUBIC  # type: ignore
-
 log = logging.getLogger(__name__)
 
 VECTOR_PAGE_DPI = 400
@@ -563,7 +556,7 @@ def preprocess_deskew(input_file: Path, page_context: PageContext) -> Path:
         # resampling if image is mode '1' or 'P'
         deskewed = im.rotate(
             deskew_angle_degrees,
-            resample=BICUBIC,
+            resample=Image.Resampling.BICUBIC,
             fillcolor=ImageColor.getcolor('white', mode=im.mode),  # type: ignore
         )
         deskewed.save(output_file, dpi=dpi)

src/ocrmypdf/imageops.py

@@ -11,14 +11,6 @@ from typing import Optional
 
 from PIL import Image
 
-# Remove this workaround when we require Pillow >= 9.1.0
-try:
-    Resampling = Image.Resampling  # type: ignore
-except AttributeError:
-    # Pillow 9 shim
-    Resampling = Image  # type: ignore
-
-
 # While from __future__ import annotations, we use singledispatch here, which
 # does not support annotations. Disable check about using old-style typing
 # until Python 3.10, OR when drop singledispatch in ocrmypdf 15.
@@ -135,7 +127,7 @@ def downsample_image(
     image: Image.Image,
     new_size: tuple[int, int],
     *,
-    resample_mode: Image.Resampling = Resampling.BICUBIC,
+    resample_mode: Image.Resampling = Image.Resampling.BICUBIC,
     reducing_gap: int = 3,
 ) -> Image.Image:
     """Downsample an image to fit within the given limits.

tests/test_rotation.py

@@ -23,13 +23,6 @@ from .conftest import check_ocrmypdf, run_ocrmypdf
 
 # pylintx: disable=unused-variable
 
-# Remove this workaround when we require Pillow >= 10
-try:
-    Transpose = Image.Transpose  # type: ignore
-except AttributeError:
-    # Pillow 9 shim
-    Transpose = Image  # type: ignore
-
 RENDERERS = ['hocr', 'sandwich']
 
 
@@ -226,7 +219,7 @@ def test_rotate_page_level(image_angle, page_angle, resources, outdir):
         with Image.open(fspath(resources / 'typewriter.png')) as im:
             if image_angle != 0:
                 ccw_angle = -image_angle % 360
-                im = im.transpose(getattr(Transpose, f'ROTATE_{ccw_angle}'))
+                im = im.transpose(getattr(Image.Transpose, f'ROTATE_{ccw_angle}'))
             im.save(memimg, format='PNG')
         memimg.seek(0)
         mempdf = BytesIO()