file-handling

Secure file uploads in ASP.NET Core are handled by validating file types and sizes using magic numbers to prevent malicious uploads. This approach checks file content rather than extensions to mitigate security vulnerabilities and memory exhaustion.

Streaming large file uploads directly to Azure Blob Storage avoids excessive memory consumption. This technique uploads files directly to storage without buffering the entire payload in memory, preventing memory exhaustion during large file operations.

Magic number validation secures file uploads by reading the specific byte signatures at the beginning of a file to verify its true content type. This prevents malicious uploads disguised with trusted file extensions from bypassing standard validation checks.

Yes, the file handling approach uses a storage abstraction that supports interchangeable storage backends. You can seamlessly switch between local file systems and Azure Blob Storage using a pluggable IFileStorageService without changing core upload logic.

Secure file downloads in ASP.NET Core ensure files are served with proper authorization checks and correct content disposition headers. This prevents unauthorized access while guaranteeing files are downloaded rather than rendered inline by the browser.

Image processing during file uploads resizes and optimizes images using the SixLabors.ImageSharp library. This capability is integrated directly into the upload pipeline, ensuring images are efficiently processed before being saved to storage.