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b833588 | 1 | Write python code to Create a secure file upload handler with validation using Flask. accepts multipart/form-data file upload via POST /upload; validates file type and size; saves to secure directory. Structure the project as: app/, routes/upload.py, utils/file_validator.py. Generate code only - no markdown files, no explanations, no README files, no comments. Keep output concise and purpose-ready. |