Fix Pillow 10.x compatibility with targeted textsize patch instead of global monkey patching

.gitignore

@@ -133,3 +133,6 @@ __queuestorage__
 __azurite_db*__.json
 .python_packages
 .azure
+
+# Test scripts
+test_pillow_compatibility.py

function/fastapi_app.py

@@ -7,6 +7,9 @@
 from opentelemetry.sdk.trace import TracerProvider
 from opentelemetry.sdk.trace.export import BatchSpanProcessor
 
+# Import Pillow 10.x compatibility patch for py-staticmaps
+import pillow_textsize_compat  # noqa: F401
+
 from . import fastapi_routes
 
 

pillow_textsize_compat.py

@@ -0,0 +1,37 @@
+"""
+Pillow 10.x compatibility patch for py-staticmaps.
+
+This module provides a monkey patch to restore the textsize() method
+that was removed in Pillow 10.0.0 and replaced with textbbox().
+
+This ensures compatibility with py-staticmaps 0.4.0 while maintaining
+the security benefits of Pillow 10.3.0.
+"""
+
+from PIL import ImageDraw
+
+
+def textsize(self, text, font=None, *args, **kwargs):
+    """
+    Compatibility method for Pillow 10.x that provides the old textsize() behavior.
+
+    This method uses the new textbbox() method and converts the result to the
+    (width, height) tuple that textsize() used to return.
+
+    Args:
+        text: The text to measure
+        font: The font to use (optional)
+        *args, **kwargs: Additional arguments passed to textbbox
+
+    Returns:
+        tuple: (width, height) of the text
+    """
+    # Use textbbox with anchor point (0, 0) and convert to size
+    bbox = self.textbbox((0, 0), text, font=font, *args, **kwargs)
+    # bbox is (left, top, right, bottom), so width = right - left, height = bottom - top
+    return (bbox[2] - bbox[0], bbox[3] - bbox[1])
+
+
+# Only patch if textsize doesn't exist (i.e., Pillow 10.x)
+if not hasattr(ImageDraw.ImageDraw, "textsize"):
+    ImageDraw.ImageDraw.textsize = textsize

requirements.txt

@@ -5,7 +5,7 @@
 azure-functions>=1.12.0
 py-staticmaps==0.4.0
 fastapi==0.111.0
-Pillow==9.5.0
+Pillow==10.3.0
 nest-asyncio==1.6.0
 opentelemetry-instrumentation-fastapi==0.48b0
 azure-monitor-opentelemetry-exporter==1.0.0b29