using System; using System.Collections.Generic; using System.Linq; using System.Net; using System.Net.Http; using System.Text; using System.Threading.Tasks; namespace Rssdp.Infrastructure { /// <summary> /// Parses a string into a <see cref="HttpResponseMessage"/> or throws an exception. /// </summary> public sealed class HttpResponseParser : HttpParserBase<HttpResponseMessage> { #region Fields & Constants 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" }; #endregion #region Public Methods /// <summary> /// Parses the specified data into a <see cref="HttpResponseMessage"/> instance. /// </summary> /// <param name="data">A string containing the data to parse.</param> /// <returns>A <see cref="HttpResponseMessage"/> instance containing the parsed data.</returns> public override HttpResponseMessage Parse(string data) { HttpResponseMessage retVal = null; try { retVal = new HttpResponseMessage(); Parse(retVal, retVal.Headers, data); return retVal; } catch { if (retVal != null) retVal.Dispose(); throw; } } #endregion #region Overrides Methods /// <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> /// <returns>A boolean, true if th specified header relates to HTTP content, otherwise false.</returns> protected override bool IsContentHeader(string headerName) { return ContentHeaderNames.Contains(headerName, StringComparer.OrdinalIgnoreCase); } /// <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, HttpResponseMessage 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("data status line is invalid. Insufficient status parts.", nameof(data)); message.Version = ParseHttpVersion(parts[0].Trim()); int statusCode = -1; if (!Int32.TryParse(parts[1].Trim(), out statusCode)) throw new ArgumentException("data status line is invalid. Status code is not a valid integer.", nameof(data)); message.StatusCode = (HttpStatusCode)statusCode; if (parts.Length >= 3) { message.ReasonPhrase = parts[2].Trim(); } } #endregion } }