pdfa: replace pkg_resources with importlib.resources

src/ocrmypdf/data/__init__.py

@@ -0,0 +1,8 @@
+# © 2021 James R. Barlow: github.com/jbarlow83
+#
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+
+"""Data files used to generate certain PDFs."""

src/ocrmypdf/pdfa.py

@@ -10,16 +10,20 @@ Utilities for PDF/A production and confirmation with Ghostspcript.
 """
 
 import base64
+import importlib.resources
 from pathlib import Path
 from typing import Dict, Iterator, Union
 
 import pikepdf
-import pkg_resources
+import pkg_resources  # deprecated
 
+# Deprecated
 ICC_PROFILE_RELPATH = 'data/sRGB.icc'
-
+# Deprecated
 SRGB_ICC_PROFILE = pkg_resources.resource_filename('ocrmypdf', ICC_PROFILE_RELPATH)
 
+SRGB_ICC_PROFILE_NAME = 'sRGB.icc'
+
 
 def _postscript_objdef(
     alias: str,
@@ -97,12 +101,12 @@ def generate_pdfa_ps(target_filename: Path, icc: str = 'sRGB'):
     References:
         Adobe PDFMARK Reference: https://www.adobe.com/content/dam/acom/en/devnet/acrobat/pdfs/pdfmark_reference.pdf
     """
-    if icc == 'sRGB':
-        icc_profile = SRGB_ICC_PROFILE
-    else:
+    if icc != 'sRGB':
         raise NotImplementedError("Only supporting sRGB")
 
-    bytes_icc_profile = Path(icc_profile).read_bytes()
+    bytes_icc_profile = importlib.resources.read_binary(
+        'ocrmypdf.data', SRGB_ICC_PROFILE_NAME
+    )
     ps = '\n'.join(_make_postscript(icc, bytes_icc_profile, 3))
 
     # We should have encoded everything to pure ASCII by this point, and