Compatibility with pypdf 3+

--HG-- branch : 16.0

models/redner_report.py

 ##############################################################################
 #
 #    Redner Odoo module
-#    Copyright © 2016 XCG Consulting <https://xcg-consulting.fr>
+#    Copyright © 2016, 2024 XCG Consulting <https://xcg-consulting.fr>
 #
 #    This program is free software: you can redistribute it and/or modify
 #    it under the terms of the GNU Affero General Public License as
@@ -36,11 +36,13 @@ from ..utils.formats import Formats
 
 logger = logging.getLogger(__name__)
 
-
+_pypdf2 = False
 try:
-    from PyPDF2 import PdfFileReader, PdfFileWriter
+    from pypdf import PdfWriter
 except ImportError:
-    logger.debug("Cannot import PyPDF2")
+    from PyPDF2 import PdfFileReader, PdfFileWriter
+
+    _pypdf2 = True
 
 
 class RednerReport(models.TransientModel):
@@ -137,10 +139,13 @@ class RednerReport(models.TransientModel):
         :param reports_path: list of path of pdf files
         :returns: path of the merged pdf
         """
-        writer = PdfFileWriter()
+        writer = PdfFileWriter() if _pypdf2 else PdfWriter()
         for path in reports_path:
-            reader = PdfFileReader(path)
-            writer.appendPagesFromReader(reader)
+            if _pypdf2:
+                reader = PdfFileReader(path)
+                writer.appendPagesFromReader(reader)
+            else:
+                writer.append(path)
         merged_file_fd, merged_file_path = tempfile.mkstemp(
             suffix=".pdf", prefix="report.merged.tmp."
         )