Add image support for search (#4090)

* add support for image search

* quick fix up

* k

* k

* k

* k

* nit

* quick fix for connector tests

backend/onyx/file_processing/file_validation.py

@@ -0,0 +1,46 @@
+"""
+Centralized file type validation utilities.
+"""
+# Standard image MIME types supported by most vision LLMs
+IMAGE_MIME_TYPES = [
+    "image/png",
+    "image/jpeg",
+    "image/jpg",
+    "image/webp",
+]
+
+# Image types that should be excluded from processing
+EXCLUDED_IMAGE_TYPES = [
+    "image/bmp",
+    "image/tiff",
+    "image/gif",
+    "image/svg+xml",
+]
+
+
+def is_valid_image_type(mime_type: str) -> bool:
+    """
+    Check if mime_type is a valid image type.
+
+    Args:
+        mime_type: The MIME type to check
+
+    Returns:
+        True if the MIME type is a valid image type, False otherwise
+    """
+    if not mime_type:
+        return False
+    return mime_type.startswith("image/") and mime_type not in EXCLUDED_IMAGE_TYPES
+
+
+def is_supported_by_vision_llm(mime_type: str) -> bool:
+    """
+    Check if this image type can be processed by vision LLMs.
+
+    Args:
+        mime_type: The MIME type to check
+
+    Returns:
+        True if the MIME type is supported by vision LLMs, False otherwise
+    """
+    return mime_type in IMAGE_MIME_TYPES