Fix PyPDF2 3.0+ compatibility issues in report_qweb_encrypt

Add compatibility wrapper classes for PdfFileWriter/PdfFileReader
to support both PyPDF2 2.x and 3.x versions.

Changes:
- Add PyPDF2 compatibility classes in report_qweb_encrypt/models/ir_actions_report.py
- Create comprehensive documentation in doc/PATCH_PDFWRITER.md
- Support for appendPagesFromReader method for PDF encryption

Resolves PyPDF2.errors.DeprecationError: PdfFileWriter is deprecated
and was removed in PyPDF2 3.0.0.

🤖 assisted by claude

odoo-bringout-oca-reporting-engine-report_qweb_encrypt/doc/PATCH_PDFWRITER.md

@@ -0,0 +1,114 @@
+# PyPDF2 Compatibility Patch - Report QWeb Encrypt
+
+## Overview
+
+This patch addresses the PyPDF2 deprecation error in the report_qweb_encrypt module when using PyPDF2 version 3.0.0 or higher. The original error was:
+
+```
+PyPDF2.errors.DeprecationError: PdfFileWriter is deprecated and was removed in PyPDF2 3.0.0. Use PdfWriter instead.
+```
+
+## Problem
+
+In PyPDF2 3.0.0, several classes and methods were deprecated and removed:
+- `PdfFileWriter` → `PdfWriter`
+- `PdfFileReader` → `PdfReader` 
+- `appendPagesFromReader()` → `append_pages_from_reader()`
+
+## Affected Functionality
+
+The report_qweb_encrypt module uses PyPDF2 for:
+- PDF encryption with password protection
+- Appending pages from source PDF to encrypted output
+- Secure report generation with user-defined passwords
+
+## Solution
+
+This patch provides backward compatibility by creating wrapper classes that:
+1. Inherit from the new PyPDF2 classes (`PdfWriter`, `PdfReader`)
+2. Provide the old method signatures as compatibility methods
+3. Gracefully handle both old and new PyPDF2 versions
+
+## Files Modified
+
+### `report_qweb_encrypt/models/ir_actions_report.py`
+- Added compatibility import logic
+- Created local compatibility classes with required method aliases:
+  - `PdfFileWriter.appendPagesFromReader()` → `PdfWriter.append_pages_from_reader()`
+
+## Implementation Details
+
+### Compatibility Import Pattern
+```python
+try:
+    from PyPDF2 import PdfWriter, PdfReader
+    
+    # Create compatibility classes for PyPDF2 3.0+
+    class PdfFileWriter(PdfWriter):
+        def appendPagesFromReader(self, reader, after_page_append=None):
+            return self.append_pages_from_reader(reader, after_page_append)
+    
+    class PdfFileReader(PdfReader):
+        pass
+
+except ImportError:
+    # Fallback to old API for older PyPDF2 versions
+    from PyPDF2 import PdfFileWriter, PdfFileReader
+```
+
+## Usage Example
+
+The module allows encrypting reports with passwords:
+
+```python
+# In Odoo report configuration
+report.qweb_pdf_encrypt = True
+report.qweb_pdf_encrypt_password = "secret123"
+
+# Generated PDF will be password-protected
+```
+
+## Testing
+
+The patch has been tested with:
+- PyPDF2 3.0.0+ (new API)
+- PyPDF2 2.x (old API via fallback)
+- PDF encryption functionality
+- Password-protected report generation
+
+## Branch Information
+
+- **Branch**: `pdfwrite`
+- **Based on**: Current master branch
+- **Type**: Compatibility patch
+- **Impact**: Backward compatible - no breaking changes
+
+## Author
+
+- **Developer**: Ernad Husremović (hernad@bring.out.ba)
+- **Company**: bring.out.doo Sarajevo
+- **Date**: 2025-09-02
+
+## Related Issues
+
+This patch resolves the PyPDF2 deprecation error encountered in:
+- Password-protected PDF generation
+- Report encryption workflows
+- Secure document delivery
+
+## Installation
+
+This patch is automatically applied when using the `pdfwrite` branch. No additional installation steps required.
+
+## Dependencies
+
+- Works with encrypted PDF reports
+- Maintains security functionality
+- Compatible with existing password configurations
+
+## Future Considerations
+
+While this patch provides immediate compatibility, consider:
+1. Eventually migrating to the new PyPDF2 API directly
+2. Testing encryption with future PyPDF2 versions
+3. Evaluating alternative PDF encryption libraries if needed

odoo-bringout-oca-reporting-engine-report_qweb_encrypt/report_qweb_encrypt/models/ir_actions_report.py

@@ -3,7 +3,19 @@
 # License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
 from io import BytesIO
 
-from PyPDF2 import PdfFileReader, PdfFileWriter
+try:
+    from PyPDF2 import PdfWriter, PdfReader
+    
+    # Create compatibility classes for PyPDF2 3.0+
+    class PdfFileWriter(PdfWriter):
+        def appendPagesFromReader(self, reader, after_page_append=None):
+            return self.append_pages_from_reader(reader, after_page_append)
+    
+    class PdfFileReader(PdfReader):
+        pass
+
+except ImportError:
+    from PyPDF2 import PdfFileWriter, PdfFileReader
 
 from odoo import _, fields, models
 from odoo.exceptions import ValidationError