ByteGuard.FileValidator.AspNetCore

⚠️ DEPRECATION WARNING

This repo has been archived. Refer to ByteGuard.FileValidator.Extensions.DependencyInjection for of integration with Microsoft.Extensions.DependencyInjection instead.

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ByteGuard.FileValidator.AspNetCore provides first-class integration of ByteGuard.FileValidator with ASP.NET Core.

It gives you:

• Extension methods to register the file validator in the DI container
• Easy configuration via appsettings.json or fluent configuration in code
• A single, consistent way to validate uploaded files across your ASP.NET Core apps

This package is the ASP.NET Core integration layer. The core validation logic lives in ByteGuard.FileValidator.

Getting Started

Installation

This package is published and installed via NuGet.

Reference the package in your project:

dotnet add package ByteGuard.FileValidator.AspNetCore

Usage

Add to DI container

In your Program.cs (or Startup.cs in older projects), register the validator:

using ByteGuard.FileValidator.AspNetCore;

// Using inline configuration
builder.Services.AddFileValidator(options => 
{
    options.AllowFileTypes(FileExtensions.Pdf, FileExtensions.Jpg, FileExtensions.Png);
    options.FileSizeLimit = ByteSize.MegaBytes(25);
    options.ThrowOnInvalidFiles(false);
});

// Using configuration from appsettings.json
builder.Services.AddFileValidator(options => configuration.GetSection("FileValidatorConfiguration").Bind(options));

Injection & Usage

You can then inject FileValidator into your services and other classes.

public class MyService
{
    private readonly FileValidator _fileValidator;

    public MyService(FileValidator fileValidator)
    {
        _fileValidator = fileValidator;
    }

    public bool SaveFile(Stream fileStream, string fileName)
    {
        var isValid = _fileValidator.IsValidFile(fileName, fileStream);
        
        // ...
    }
}

Configuration via appsettings

It's possible to configure the FileValidator through appsettings.json.

ℹ️ As you'll notice below, you can either define the FileSizeLimit in raw byte size, or use the FriendlyFileSizeLimit to define the file size in a more human readable format. When both are defined, FileSizeLimit always wins over FriendlyFileSizeLimit.

{
  "FileValidatorConfiguration": {
    "SupportedFileTypes": [ ".pdf", ".jpg", ".png" ],
    "FileSizeLimit": 26214400,
    "FriendlyFileSizeLimit": "25MB",
    "ThrowExceptionOnInvalidFile": true
  }
}

License

ByteGuard.FileValidator.AspNetCore is Copyright © ByteGuard Contributors - Provided under the MIT license.