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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.FileProviders;
namespace Microsoft.AspNetCore.SpaServices.StaticFiles;
/// <summary>
/// Provides an implementation of <see cref="ISpaStaticFileProvider"/> that supplies
/// physical files at a location configured using <see cref="SpaStaticFilesOptions"/>.
/// </summary>
internal sealed class DefaultSpaStaticFileProvider : ISpaStaticFileProvider
{
private readonly IFileProvider? _fileProvider;
public DefaultSpaStaticFileProvider(
IServiceProvider serviceProvider,
SpaStaticFilesOptions options)
{
ArgumentNullException.ThrowIfNull(options);
if (string.IsNullOrEmpty(options.RootPath))
{
throw new ArgumentException($"The {nameof(options.RootPath)} property " +
$"of {nameof(options)} cannot be null or empty.");
}
var env = serviceProvider.GetRequiredService<IWebHostEnvironment>();
var absoluteRootPath = Path.Combine(
env.ContentRootPath,
options.RootPath);
// PhysicalFileProvider will throw if you pass a non-existent path,
// but we don't want that scenario to be an error because for SPA
// scenarios, it's better if non-existing directory just means we
// don't serve any static files.
if (Directory.Exists(absoluteRootPath))
{
_fileProvider = new PhysicalFileProvider(absoluteRootPath);
}
}
public IFileProvider? FileProvider => _fileProvider;
}
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