90 lines
3.4 KiB
C#
90 lines
3.4 KiB
C#
// Copyright (c) .NET Foundation. All rights reserved.
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// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
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using System;
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using System.Threading.Tasks;
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using Microsoft.AspNetCore.Http;
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using Microsoft.AspNetCore.Mvc.Internal;
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using Microsoft.Extensions.DependencyInjection;
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using Microsoft.Extensions.Logging;
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using Microsoft.Net.Http.Headers;
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namespace Microsoft.AspNetCore.Mvc
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{
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/// <summary>
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/// Represents an <see cref="ActionResult"/> that when executed will
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/// write a file as the response.
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/// </summary>
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public abstract class FileResult : ActionResult
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{
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private string _fileDownloadName;
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/// <summary>
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/// Creates a new <see cref="FileResult"/> instance with
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/// the provided <paramref name="contentType"/>.
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/// </summary>
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/// <param name="contentType">The Content-Type header of the response.</param>
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protected FileResult(string contentType)
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{
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if (contentType == null)
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{
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throw new ArgumentNullException(nameof(contentType));
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}
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ContentType = contentType;
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}
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/// <summary>
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/// Gets the Content-Type header for the response.
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/// </summary>
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public string ContentType { get; }
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/// <summary>
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/// Gets the file name that will be used in the Content-Disposition header of the response.
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/// </summary>
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public string FileDownloadName
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{
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get { return _fileDownloadName ?? string.Empty; }
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set { _fileDownloadName = value; }
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}
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/// <inheritdoc />
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public override Task ExecuteResultAsync(ActionContext context)
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{
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if (context == null)
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{
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throw new ArgumentNullException(nameof(context));
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}
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var loggerFactory = context.HttpContext.RequestServices.GetRequiredService<ILoggerFactory>();
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var logger = loggerFactory.CreateLogger<FileResult>();
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var response = context.HttpContext.Response;
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response.ContentType = ContentType.ToString();
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if (!string.IsNullOrEmpty(FileDownloadName))
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{
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// From RFC 2183, Sec. 2.3:
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// The sender may want to suggest a filename to be used if the entity is
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// detached and stored in a separate file. If the receiving MUA writes
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// the entity to a file, the suggested filename should be used as a
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// basis for the actual filename, where possible.
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var contentDisposition = new ContentDispositionHeaderValue("attachment");
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contentDisposition.SetHttpFileName(FileDownloadName);
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context.HttpContext.Response.Headers[HeaderNames.ContentDisposition] = contentDisposition.ToString();
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}
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logger.FileResultExecuting(FileDownloadName);
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return WriteFileAsync(response);
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}
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/// <summary>
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/// Writes the file to the specified <paramref name="response"/>.
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/// </summary>
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/// <param name="response">The <see cref="HttpResponse"/>.</param>
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/// <returns>
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/// A <see cref="Task"/> that will complete when the file has been written to the response.
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/// </returns>
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protected abstract Task WriteFileAsync(HttpResponse response);
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}
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} |