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381 lines
18 KiB
C#
381 lines
18 KiB
C#
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// Copyright (c) Microsoft Corporation. All rights reserved. See License.txt in the project root for license information.
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using System.Collections.Generic;
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using System.ComponentModel;
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using System.Diagnostics.CodeAnalysis;
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using System.Diagnostics.Contracts;
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using System.Globalization;
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using System.IO;
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using System.Linq;
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using System.Net.Http.Formatting.Parsers;
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using System.Net.Http.Headers;
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using System.Threading.Tasks;
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namespace System.Net.Http
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{
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/// <summary>
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/// Extension methods to read <see cref="HttpRequestMessage"/> and <see cref="HttpResponseMessage"/> entities from <see cref="HttpContent"/> instances.
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/// </summary>
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[EditorBrowsable(EditorBrowsableState.Never)]
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public static class HttpContentMessageExtensions
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{
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private const int MinBufferSize = 256;
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private const int DefaultBufferSize = 32 * 1024;
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/// <summary>
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/// Determines whether the specified content is HTTP request message content.
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/// </summary>
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/// <param name="content">The content.</param>
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/// <returns>
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/// <c>true</c> if the specified content is HTTP message content; otherwise, <c>false</c>.
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/// </returns>
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[SuppressMessage("Microsoft.Design", "CA1031:DoNotCatchGeneralExceptionTypes", Justification = "Exception translates to false.")]
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public static bool IsHttpRequestMessageContent(this HttpContent content)
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{
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if (content == null)
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{
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throw new ArgumentNullException("content");
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}
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try
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{
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return HttpMessageContent.ValidateHttpMessageContent(content, true, false);
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}
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catch (Exception)
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{
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return false;
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}
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}
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/// <summary>
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/// Determines whether the specified content is HTTP response message content.
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/// </summary>
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/// <param name="content">The content.</param>
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/// <returns>
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/// <c>true</c> if the specified content is HTTP message content; otherwise, <c>false</c>.
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/// </returns>
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[SuppressMessage("Microsoft.Design", "CA1031:DoNotCatchGeneralExceptionTypes", Justification = "Exception translates to false.")]
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public static bool IsHttpResponseMessageContent(this HttpContent content)
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{
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if (content == null)
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{
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throw new ArgumentNullException("content");
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}
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try
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{
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return HttpMessageContent.ValidateHttpMessageContent(content, false, false);
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}
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catch (Exception)
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{
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return false;
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}
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}
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/// <summary>
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/// Read the <see cref="HttpContent"/> as an <see cref="HttpRequestMessage"/>.
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/// </summary>
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/// <param name="content">The content to read.</param>
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/// <returns>The parsed <see cref="HttpRequestMessage"/> instance.</returns>
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public static Task<HttpRequestMessage> ReadAsHttpRequestMessageAsync(this HttpContent content)
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{
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return ReadAsHttpRequestMessageAsync(content, Uri.UriSchemeHttp, DefaultBufferSize);
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}
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/// <summary>
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/// Read the <see cref="HttpContent"/> as an <see cref="HttpRequestMessage"/>.
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/// </summary>
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/// <param name="content">The content to read.</param>
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/// <param name="uriScheme">The URI scheme to use for the request URI.</param>
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/// <returns>The parsed <see cref="HttpRequestMessage"/> instance.</returns>
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[SuppressMessage("Microsoft.Design", "CA1054:UriParametersShouldNotBeStrings", MessageId = "1#", Justification = "This is not a full URI but only the URI scheme")]
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public static Task<HttpRequestMessage> ReadAsHttpRequestMessageAsync(this HttpContent content, string uriScheme)
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{
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return ReadAsHttpRequestMessageAsync(content, uriScheme, DefaultBufferSize);
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}
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/// <summary>
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/// Read the <see cref="HttpContent"/> as an <see cref="HttpRequestMessage"/>.
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/// </summary>
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/// <param name="content">The content to read.</param>
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/// <param name="uriScheme">The URI scheme to use for the request URI (the
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/// URI scheme is not actually part of the HTTP Request URI and so must be provided externally).</param>
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/// <param name="bufferSize">Size of the buffer.</param>
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/// <returns>The parsed <see cref="HttpRequestMessage"/> instance.</returns>
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[SuppressMessage("Microsoft.Design", "CA1054:UriParametersShouldNotBeStrings", MessageId = "1#", Justification = "This is not a full URI but only the URI scheme")]
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[SuppressMessage("Microsoft.Design", "CA1031:DoNotCatchGeneralExceptionTypes", Justification = "Exception translates to parser state.")]
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public static Task<HttpRequestMessage> ReadAsHttpRequestMessageAsync(this HttpContent content, string uriScheme, int bufferSize)
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{
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if (content == null)
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{
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throw new ArgumentNullException("content");
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}
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if (uriScheme == null)
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{
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throw new ArgumentNullException("uriScheme");
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}
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if (!Uri.CheckSchemeName(uriScheme))
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{
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throw new ArgumentException(RS.Format(Properties.Resources.HttpMessageParserInvalidUriScheme, uriScheme, typeof(Uri).Name), "uriScheme");
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}
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if (bufferSize < MinBufferSize)
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{
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throw new ArgumentOutOfRangeException("bufferSize", bufferSize, RS.Format(Properties.Resources.ArgumentMustBeGreaterThanOrEqualTo, MinBufferSize));
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}
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HttpMessageContent.ValidateHttpMessageContent(content, true, true);
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return content.ReadAsStreamAsync().Then(stream =>
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{
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HttpUnsortedRequest httpRequest = new HttpUnsortedRequest();
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HttpRequestHeaderParser parser = new HttpRequestHeaderParser(httpRequest);
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ParserState parseStatus;
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byte[] buffer = new byte[bufferSize];
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int bytesRead = 0;
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int headerConsumed = 0;
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while (true)
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{
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try
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{
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bytesRead = stream.Read(buffer, 0, buffer.Length);
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}
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catch (Exception e)
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{
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throw new IOException(Properties.Resources.HttpMessageErrorReading, e);
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}
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try
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{
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parseStatus = parser.ParseBuffer(buffer, bytesRead, ref headerConsumed);
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}
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catch (Exception)
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{
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parseStatus = ParserState.Invalid;
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}
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if (parseStatus == ParserState.Done)
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{
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return CreateHttpRequestMessage(uriScheme, httpRequest, stream, bytesRead - headerConsumed);
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}
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else if (parseStatus != ParserState.NeedMoreData)
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{
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throw new IOException(RS.Format(Properties.Resources.HttpMessageParserError, headerConsumed, buffer));
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}
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}
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});
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}
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/// <summary>
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/// Read the <see cref="HttpContent"/> as an <see cref="HttpResponseMessage"/>.
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/// </summary>
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/// <param name="content">The content to read.</param>
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/// <returns>The parsed <see cref="HttpResponseMessage"/> instance.</returns>
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public static Task<HttpResponseMessage> ReadAsHttpResponseMessageAsync(this HttpContent content)
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{
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return ReadAsHttpResponseMessageAsync(content, DefaultBufferSize);
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}
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/// <summary>
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/// Read the <see cref="HttpContent"/> as an <see cref="HttpResponseMessage"/>.
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/// </summary>
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/// <param name="content">The content to read.</param>
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/// <param name="bufferSize">Size of the buffer.</param>
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/// <returns>The parsed <see cref="HttpResponseMessage"/> instance.</returns>
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[SuppressMessage("Microsoft.Design", "CA1031:DoNotCatchGeneralExceptionTypes", Justification = "Exception translates to parser state.")]
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public static Task<HttpResponseMessage> ReadAsHttpResponseMessageAsync(this HttpContent content, int bufferSize)
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{
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if (content == null)
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{
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throw new ArgumentNullException("content");
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}
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if (bufferSize < MinBufferSize)
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{
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throw new ArgumentOutOfRangeException("bufferSize", bufferSize, RS.Format(Properties.Resources.ArgumentMustBeGreaterThanOrEqualTo, MinBufferSize));
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}
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HttpMessageContent.ValidateHttpMessageContent(content, false, true);
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return content.ReadAsStreamAsync().Then(stream =>
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{
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HttpUnsortedResponse httpResponse = new HttpUnsortedResponse();
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HttpResponseHeaderParser parser = new HttpResponseHeaderParser(httpResponse);
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ParserState parseStatus;
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byte[] buffer = new byte[bufferSize];
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int bytesRead = 0;
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int headerConsumed = 0;
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while (true)
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{
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try
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{
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bytesRead = stream.Read(buffer, 0, buffer.Length);
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}
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catch (Exception e)
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{
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throw new IOException(Properties.Resources.HttpMessageErrorReading, e);
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}
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try
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{
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parseStatus = parser.ParseBuffer(buffer, bytesRead, ref headerConsumed);
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}
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catch (Exception)
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{
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parseStatus = ParserState.Invalid;
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}
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if (parseStatus == ParserState.Done)
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{
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// Create and return parsed HttpResponseMessage
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return CreateHttpResponseMessage(httpResponse, stream, bytesRead - headerConsumed);
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}
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else if (parseStatus != ParserState.NeedMoreData)
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{
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throw new IOException(RS.Format(Properties.Resources.HttpMessageParserError, headerConsumed, buffer));
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}
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}
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});
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}
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/// <summary>
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/// Creates the request URI by combining scheme (provided) with parsed values of
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/// host and path.
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/// </summary>
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/// <param name="uriScheme">The URI scheme to use for the request URI.</param>
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/// <param name="httpRequest">The unsorted HTTP request.</param>
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/// <returns>A fully qualified request URI.</returns>
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private static Uri CreateRequestUri(string uriScheme, HttpUnsortedRequest httpRequest)
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{
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Contract.Assert(httpRequest != null, "httpRequest cannot be null.");
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Contract.Assert(uriScheme != null, "uriScheme cannot be null");
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IEnumerable<string> hostValues;
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if (httpRequest.HttpHeaders.TryGetValues(FormattingUtilities.HttpHostHeader, out hostValues))
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{
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int hostCount = hostValues.Count();
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if (hostCount != 1)
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{
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throw new IOException(RS.Format(Properties.Resources.HttpMessageParserInvalidHostCount, FormattingUtilities.HttpHostHeader, hostCount));
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}
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}
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else
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{
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throw new IOException(RS.Format(Properties.Resources.HttpMessageParserInvalidHostCount, FormattingUtilities.HttpHostHeader, 0));
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}
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// We don't use UriBuilder as hostValues.ElementAt(0) contains 'host:port' and UriBuilder needs these split out into separate host and port.
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string requestUri = String.Format(CultureInfo.InvariantCulture, "{0}://{1}{2}", uriScheme, hostValues.ElementAt(0), httpRequest.RequestUri);
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return new Uri(requestUri);
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}
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/// <summary>
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/// Copies the unsorted header fields to a sorted collection.
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/// </summary>
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/// <param name="source">The unsorted source headers</param>
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/// <param name="destination">The destination <see cref="HttpRequestHeaders"/> or <see cref="HttpResponseHeaders"/>.</param>
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/// <param name="contentStream">The input <see cref="Stream"/> used to form any <see cref="HttpContent"/> being part of this HTTP request.</param>
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/// <param name="rewind">Start location of any request entity within the <paramref name="contentStream"/>.</param>
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/// <returns>An <see cref="HttpContent"/> instance if header fields contained and <see cref="HttpContentHeaders"/>.</returns>
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private static HttpContent CreateHeaderFields(HttpHeaders source, HttpHeaders destination, Stream contentStream, int rewind)
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{
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Contract.Assert(source != null, "source headers cannot be null");
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Contract.Assert(destination != null, "destination headers cannot be null");
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Contract.Assert(contentStream != null, "contentStream must be non null");
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HttpContentHeaders contentHeaders = null;
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HttpContent content = null;
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// Set the header fields
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foreach (KeyValuePair<string, IEnumerable<string>> header in source)
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{
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if (!destination.TryAddWithoutValidation(header.Key, header.Value))
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{
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if (contentHeaders == null)
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{
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contentHeaders = FormattingUtilities.CreateEmptyContentHeaders();
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}
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contentHeaders.TryAddWithoutValidation(header.Key, header.Value);
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}
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}
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// If we have content headers then create an HttpContent for this Response
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if (contentHeaders != null)
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{
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// Need to rewind the input stream to be at the position right after the HTTP header
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// which we may already have parsed as we read the content stream.
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if (!contentStream.CanSeek)
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{
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throw new IOException(RS.Format(Properties.Resources.HttpMessageContentStreamMustBeSeekable, "ContentReadStream", FormattingUtilities.HttpResponseMessageType.Name));
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}
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contentStream.Seek(0 - rewind, SeekOrigin.Current);
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content = new StreamContent(contentStream);
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contentHeaders.CopyTo(content.Headers);
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}
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return content;
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}
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/// <summary>
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/// Creates an <see cref="HttpRequestMessage"/> based on information provided in <see cref="HttpUnsortedRequest"/>.
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/// </summary>
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/// <param name="uriScheme">The URI scheme to use for the request URI.</param>
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/// <param name="httpRequest">The unsorted HTTP request.</param>
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/// <param name="contentStream">The input <see cref="Stream"/> used to form any <see cref="HttpContent"/> being part of this HTTP request.</param>
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/// <param name="rewind">Start location of any request entity within the <paramref name="contentStream"/>.</param>
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/// <returns>A newly created <see cref="HttpRequestMessage"/> instance.</returns>
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[SuppressMessage("Microsoft.Reliability", "CA2000:Dispose objects before losing scope", Justification = "caller becomes owner.")]
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private static HttpRequestMessage CreateHttpRequestMessage(string uriScheme, HttpUnsortedRequest httpRequest, Stream contentStream, int rewind)
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{
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Contract.Assert(uriScheme != null, "URI scheme must be non null");
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Contract.Assert(httpRequest != null, "httpRequest must be non null");
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Contract.Assert(contentStream != null, "contentStream must be non null");
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HttpRequestMessage httpRequestMessage = new HttpRequestMessage();
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// Set method, requestURI, and version
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httpRequestMessage.Method = httpRequest.Method;
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httpRequestMessage.RequestUri = CreateRequestUri(uriScheme, httpRequest);
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httpRequestMessage.Version = httpRequest.Version;
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|
|
|||
|
|
// Set the header fields and content if any
|
|||
|
|
httpRequestMessage.Content = CreateHeaderFields(httpRequest.HttpHeaders, httpRequestMessage.Headers, contentStream, rewind);
|
|||
|
|
|
|||
|
|
return httpRequestMessage;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/// <summary>
|
|||
|
|
/// Creates an <see cref="HttpResponseMessage"/> based on information provided in <see cref="HttpUnsortedResponse"/>.
|
|||
|
|
/// </summary>
|
|||
|
|
/// <param name="httpResponse">The unsorted HTTP Response.</param>
|
|||
|
|
/// <param name="contentStream">The input <see cref="Stream"/> used to form any <see cref="HttpContent"/> being part of this HTTP Response.</param>
|
|||
|
|
/// <param name="rewind">Start location of any Response entity within the <paramref name="contentStream"/>.</param>
|
|||
|
|
/// <returns>A newly created <see cref="HttpResponseMessage"/> instance.</returns>
|
|||
|
|
[SuppressMessage("Microsoft.Reliability", "CA2000:Dispose objects before losing scope", Justification = "caller becomes owner.")]
|
|||
|
|
private static HttpResponseMessage CreateHttpResponseMessage(HttpUnsortedResponse httpResponse, Stream contentStream, int rewind)
|
|||
|
|
{
|
|||
|
|
Contract.Assert(httpResponse != null, "httpResponse must be non null");
|
|||
|
|
Contract.Assert(contentStream != null, "contentStream must be non null");
|
|||
|
|
|
|||
|
|
HttpResponseMessage httpResponseMessage = new HttpResponseMessage();
|
|||
|
|
|
|||
|
|
// Set version, status code and reason phrase
|
|||
|
|
httpResponseMessage.Version = httpResponse.Version;
|
|||
|
|
httpResponseMessage.StatusCode = httpResponse.StatusCode;
|
|||
|
|
httpResponseMessage.ReasonPhrase = httpResponse.ReasonPhrase;
|
|||
|
|
|
|||
|
|
// Set the header fields and content if any
|
|||
|
|
httpResponseMessage.Content = CreateHeaderFields(httpResponse.HttpHeaders, httpResponseMessage.Headers, contentStream, rewind);
|
|||
|
|
|
|||
|
|
return httpResponseMessage;
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
}
|