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230 lines
11 KiB
C#
230 lines
11 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Net.Http;
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namespace Rssdp.Infrastructure
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{
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/// <summary>
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/// A base class for the <see cref="HttpResponseParser"/> and <see cref="HttpRequestParser"/> classes. Not intended for direct use.
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/// </summary>
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/// <typeparam name="T"></typeparam>
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public abstract class HttpParserBase<T> where T : new()
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{
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private readonly string[] LineTerminators = new string[] { "\r\n", "\n" };
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private readonly char[] SeparatorCharacters = new char[] { ',', ';' };
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/// <summary>
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/// Parses the <paramref name="data"/> provided into either a <see cref="HttpRequestMessage"/> or <see cref="HttpResponseMessage"/> object.
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/// </summary>
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/// <param name="data">A string containing the HTTP message to parse.</param>
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/// <returns>Either a <see cref="HttpRequestMessage"/> or <see cref="HttpResponseMessage"/> object containing the parsed data.</returns>
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public abstract T Parse(string data);
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/// <summary>
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/// Parses a string containing either an HTTP request or response into a <see cref="HttpRequestMessage"/> or <see cref="HttpResponseMessage"/> object.
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/// </summary>
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/// <param name="message">A <see cref="HttpRequestMessage"/> or <see cref="HttpResponseMessage"/> object representing the parsed message.</param>
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/// <param name="headers">A reference to the <see cref="System.Net.Http.Headers.HttpHeaders"/> collection for the <paramref name="message"/> object.</param>
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/// <param name="data">A string containing the data to be parsed.</param>
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/// <returns>An <see cref="HttpContent"/> object containing the content of the parsed message.</returns>
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[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2202:Do not dispose objects multiple times", Justification = "Honestly, it's fine. MemoryStream doesn't mind.")]
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protected virtual void Parse(T message, System.Net.Http.Headers.HttpHeaders headers, string data)
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{
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if (data == null)
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{
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throw new ArgumentNullException(nameof(data));
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}
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if (data.Length == 0)
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{
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throw new ArgumentException("data cannot be an empty string.", nameof(data));
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}
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if (!LineTerminators.Any(data.Contains))
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{
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throw new ArgumentException("data is not a valid request, it does not contain any CRLF/LF terminators.", nameof(data));
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}
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using (var retVal = new ByteArrayContent(Array.Empty<byte>()))
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{
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var lines = data.Split(LineTerminators, StringSplitOptions.None);
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// First line is the 'request' line containing http protocol details like method, uri, http version etc.
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ParseStatusLine(lines[0], message);
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ParseHeaders(headers, retVal.Headers, lines);
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}
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}
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/// <summary>
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/// Used to parse the first line of an HTTP request or response and assign the values to the appropriate properties on the <paramref name="message"/>.
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/// </summary>
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/// <param name="data">The first line of the HTTP message to be parsed.</param>
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/// <param name="message">Either a <see cref="HttpResponseMessage"/> or <see cref="HttpRequestMessage"/> to assign the parsed values to.</param>
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protected abstract void ParseStatusLine(string data, T message);
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/// <summary>
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/// Returns a boolean indicating whether the specified HTTP header name represents a content header (true), or a message header (false).
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/// </summary>
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/// <param name="headerName">A string containing the name of the header to return the type of.</param>
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protected abstract bool IsContentHeader(string headerName);
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/// <summary>
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/// Parses the HTTP version text from an HTTP request or response status line and returns a <see cref="Version"/> object representing the parsed values.
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/// </summary>
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/// <param name="versionData">A string containing the HTTP version, from the message status line.</param>
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/// <returns>A <see cref="Version"/> object containing the parsed version data.</returns>
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protected Version ParseHttpVersion(string versionData)
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{
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if (versionData == null)
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{
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throw new ArgumentNullException(nameof(versionData));
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}
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var versionSeparatorIndex = versionData.IndexOf('/');
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if (versionSeparatorIndex <= 0 || versionSeparatorIndex == versionData.Length)
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{
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throw new ArgumentException("request header line is invalid. Http Version not supplied or incorrect format.", nameof(versionData));
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}
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return Version.Parse(versionData.Substring(versionSeparatorIndex + 1));
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}
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/// <summary>
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/// Parses a line from an HTTP request or response message containing a header name and value pair.
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/// </summary>
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/// <param name="line">A string containing the data to be parsed.</param>
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/// <param name="headers">A reference to a <see cref="System.Net.Http.Headers.HttpHeaders"/> collection to which the parsed header will be added.</param>
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/// <param name="contentHeaders">A reference to a <see cref="System.Net.Http.Headers.HttpHeaders"/> collection for the message content, to which the parsed header will be added.</param>
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private void ParseHeader(string line, System.Net.Http.Headers.HttpHeaders headers, System.Net.Http.Headers.HttpHeaders contentHeaders)
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{
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// Header format is
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// name: value
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var headerKeySeparatorIndex = line.IndexOf(":", StringComparison.OrdinalIgnoreCase);
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var headerName = line.Substring(0, headerKeySeparatorIndex).Trim();
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var headerValue = line.Substring(headerKeySeparatorIndex + 1).Trim();
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// Not sure how to determine where request headers and content headers begin,
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// at least not without a known set of headers (general headers first the content headers)
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// which seems like a bad way of doing it. So we'll assume if it's a known content header put it there
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// else use request headers.
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var values = ParseValues(headerValue);
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var headersToAddTo = IsContentHeader(headerName) ? contentHeaders : headers;
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if (values.Count > 1)
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{
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headersToAddTo.TryAddWithoutValidation(headerName, values);
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}
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else
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{
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headersToAddTo.TryAddWithoutValidation(headerName, values[0]);
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}
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}
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private int ParseHeaders(System.Net.Http.Headers.HttpHeaders headers, System.Net.Http.Headers.HttpHeaders contentHeaders, string[] lines)
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{
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// Blank line separates headers from content, so read headers until we find blank line.
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int lineIndex = 1;
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string line = null, nextLine = null;
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while (lineIndex + 1 < lines.Length && !String.IsNullOrEmpty((line = lines[lineIndex++])))
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{
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// If the following line starts with space or tab (or any whitespace), it is really part of this header but split for human readability.
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// Combine these lines into a single comma separated style header for easier parsing.
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while (lineIndex < lines.Length && !String.IsNullOrEmpty((nextLine = lines[lineIndex])))
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{
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if (nextLine.Length > 0 && Char.IsWhiteSpace(nextLine[0]))
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{
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line += "," + nextLine.TrimStart();
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lineIndex++;
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}
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else
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{
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break;
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}
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}
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ParseHeader(line, headers, contentHeaders);
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}
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return lineIndex;
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}
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private List<string> ParseValues(string headerValue)
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{
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// This really should be better and match the HTTP 1.1 spec,
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// but this should actually be good enough for SSDP implementations
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// I think.
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var values = new List<string>();
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if (headerValue == "\"\"")
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{
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values.Add(string.Empty);
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return values;
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}
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var indexOfSeparator = headerValue.IndexOfAny(SeparatorCharacters);
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if (indexOfSeparator <= 0)
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{
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values.Add(headerValue);
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}
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else
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{
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var segments = headerValue.Split(SeparatorCharacters);
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if (headerValue.Contains('"'))
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{
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for (int segmentIndex = 0; segmentIndex < segments.Length; segmentIndex++)
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{
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var segment = segments[segmentIndex];
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if (segment.Trim().StartsWith("\"", StringComparison.OrdinalIgnoreCase))
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{
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segment = CombineQuotedSegments(segments, ref segmentIndex, segment);
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}
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values.Add(segment);
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}
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}
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else
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{
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values.AddRange(segments);
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}
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}
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return values;
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}
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private string CombineQuotedSegments(string[] segments, ref int segmentIndex, string segment)
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{
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var trimmedSegment = segment.Trim();
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for (int index = segmentIndex; index < segments.Length; index++)
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{
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if (trimmedSegment == "\"\"" ||
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(
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trimmedSegment.EndsWith("\"", StringComparison.OrdinalIgnoreCase)
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&& !trimmedSegment.EndsWith("\"\"", StringComparison.OrdinalIgnoreCase)
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&& !trimmedSegment.EndsWith("\\\"", StringComparison.OrdinalIgnoreCase))
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)
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{
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segmentIndex = index;
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return trimmedSegment.Substring(1, trimmedSegment.Length - 2);
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}
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if (index + 1 < segments.Length)
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{
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trimmedSegment += "," + segments[index + 1].TrimEnd();
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}
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}
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segmentIndex = segments.Length;
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if (trimmedSegment.StartsWith("\"", StringComparison.OrdinalIgnoreCase) && trimmedSegment.EndsWith("\"", StringComparison.OrdinalIgnoreCase))
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{
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return trimmedSegment.Substring(1, trimmedSegment.Length - 2);
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}
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else
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{
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return trimmedSegment;
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}
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}
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}
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}
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