feat(connectors): add Google Drive file type detection and mapping

- Detect Google Workspace files (Docs, Sheets, Slides)
- Map to PDF export format to preserve rich content (images, formatting)
- Identify files to skip (shortcuts, unsupported types)

surfsense_backend/app/connectors/google_drive/file_types.py

@@ -0,0 +1,37 @@
+"""
+File Type Handlers for Google Drive.
+
+Simple module for basic file type detection.
+"""
+
+# Google Workspace MIME types that need export
+GOOGLE_DOC = "application/vnd.google-apps.document"
+GOOGLE_SHEET = "application/vnd.google-apps.spreadsheet"
+GOOGLE_SLIDE = "application/vnd.google-apps.presentation"
+GOOGLE_FOLDER = "application/vnd.google-apps.folder"
+GOOGLE_SHORTCUT = "application/vnd.google-apps.shortcut"
+
+# Export MIME types for Google Workspace files
+# Export as PDF to preserve formatting, images, and structure
+EXPORT_FORMATS = {
+    GOOGLE_DOC: "application/pdf",
+    GOOGLE_SHEET: "application/pdf",
+    GOOGLE_SLIDE: "application/pdf",
+}
+
+
+def is_google_workspace_file(mime_type: str) -> bool:
+    """Check if file is a Google Workspace file that needs export."""
+    return mime_type.startswith("application/vnd.google-apps")
+
+
+def should_skip_file(mime_type: str) -> bool:
+    """Check if file should be skipped (folders, shortcuts, etc)."""
+    return mime_type in [GOOGLE_FOLDER, GOOGLE_SHORTCUT]
+
+
+def get_export_mime_type(mime_type: str) -> str | None:
+    """Get export MIME type for Google Workspace files."""
+    return EXPORT_FORMATS.get(mime_type)
+
+