using System; using System.Linq; using System.Net.Http; namespace Rssdp.Infrastructure { /// <summary> /// Parses a string into a <see cref="HttpRequestMessage"/> or throws an exception. /// </summary> public sealed class HttpRequestParser : HttpParserBase<HttpRequestMessage> { private readonly string[] ContentHeaderNames = new string[] { "Allow", "Content-Disposition", "Content-Encoding", "Content-Language", "Content-Length", "Content-Location", "Content-MD5", "Content-Range", "Content-Type", "Expires", "Last-Modified" }; /// <summary> /// Parses the specified data into a <see cref="HttpRequestMessage"/> instance. /// </summary> /// <param name="data">A string containing the data to parse.</param> /// <returns>A <see cref="HttpRequestMessage"/> instance containing the parsed data.</returns> public override HttpRequestMessage Parse(string data) { HttpRequestMessage retVal = null; try { retVal = new HttpRequestMessage(); Parse(retVal, retVal.Headers, data); return retVal; } finally { if (retVal != null) { retVal.Dispose(); } } } /// <summary> /// 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"/>. /// </summary> /// <param name="data">The first line of the HTTP message to be parsed.</param> /// <param name="message">Either a <see cref="HttpResponseMessage"/> or <see cref="HttpRequestMessage"/> to assign the parsed values to.</param> protected override void ParseStatusLine(string data, HttpRequestMessage message) { if (data == null) { throw new ArgumentNullException(nameof(data)); } if (message == null) { throw new ArgumentNullException(nameof(message)); } var parts = data.Split(' '); if (parts.Length < 2) { throw new ArgumentException("Status line is invalid. Insufficient status parts.", nameof(data)); } message.Method = new HttpMethod(parts[0].Trim()); Uri requestUri; if (Uri.TryCreate(parts[1].Trim(), UriKind.RelativeOrAbsolute, out requestUri)) { message.RequestUri = requestUri; } else { System.Diagnostics.Debug.WriteLine(parts[1]); } if (parts.Length >= 3) { message.Version = ParseHttpVersion(parts[2].Trim()); } } /// <summary> /// Returns a boolean indicating whether the specified HTTP header name represents a content header (true), or a message header (false). /// </summary> /// <param name="headerName">A string containing the name of the header to return the type of.</param> protected override bool IsContentHeader(string headerName) { return ContentHeaderNames.Contains(headerName, StringComparer.OrdinalIgnoreCase); } } }