/// <summary>
/// Looks for the "start" parameter of the parent's content type and then finds the corresponding
/// child HttpContent with a matching Content-ID header field.
/// </summary>
/// <returns>The matching child or null if none found.</returns>
private static HttpContent FindRootContent(HttpContent parent, IEnumerable <HttpContent> children)
{
Contract.Assert(children != null);
// Find 'start' parameter from parent content type. The value is used
// to identify the MIME body with the corresponding Content-ID header value.
NameValueHeaderValue startNameValue = FindMultipartRelatedParameter(parent, StartParameter);
if (startNameValue == null)
{
// If we didn't find a "start" parameter then take the first child.
return(children.FirstOrDefault());
}
// Look for the child with a Content-ID header that corresponds to the "start" value.
// If no matching child is found then we return null.
string startValue = FormattingUtilities.UnquoteToken(startNameValue.Value);
return(children.FirstOrDefault(
content =>
{
IEnumerable <string> values;
if (content.Headers.TryGetValues(ContentID, out values))
{
return String.Equals(
FormattingUtilities.UnquoteToken(values.ElementAt(0)),
startValue,
StringComparison.OrdinalIgnoreCase);
}
return false;
}));
}
/// <summary>
/// Initializes a new instance of the <see cref="MimeBodyPart"/> class.
/// </summary>
/// <param name="streamProvider">The stream provider.</param>
/// <param name="maxBodyPartHeaderSize">The max length of the MIME header within each MIME body part.</param>
/// <param name="parentContent">The part's parent content</param>
public MimeBodyPart(MultipartStreamProvider streamProvider, int maxBodyPartHeaderSize, HttpContent parentContent)
{
Contract.Assert(streamProvider != null);
Contract.Assert(parentContent != null);
this._streamProvider = streamProvider;
this._parentContent = parentContent;
this.Segments = new List <ArraySegment <byte> >(2);
this._headers = FormattingUtilities.CreateEmptyContentHeaders();
this.HeaderParser = new InternetMessageFormatHeaderParser(this._headers, maxBodyPartHeaderSize);
}
/// <summary>
/// Validates whether the content contains an HTTP Request or an HTTP Response.
/// </summary>
/// <param name="content">The content to validate.</param>
/// <param name="isRequest">if set to <c>true</c> if the content is either an HTTP Request or an HTTP Response.</param>
/// <param name="throwOnError">Indicates whether validation failure should result in an <see cref="Exception"/> or not.</param>
/// <returns><c>true</c> if content is either an HTTP Request or an HTTP Response</returns>
internal static bool ValidateHttpMessageContent(HttpContent content, bool isRequest, bool throwOnError)
{
if (content == null)
{
throw Error.ArgumentNull("content");
}
MediaTypeHeaderValue contentType = content.Headers.ContentType;
if (contentType != null)
{
if (!contentType.MediaType.Equals(DefaultMediaType, StringComparison.OrdinalIgnoreCase))
{
if (throwOnError)
{
throw Error.Argument("content", Resources.HttpMessageInvalidMediaType, FormattingUtilities.HttpContentType.Name,
isRequest ? DefaultRequestMediaType : DefaultResponseMediaType);
}
else
{
return(false);
}
}
foreach (NameValueHeaderValue parameter in contentType.Parameters)
{
if (parameter.Name.Equals(MsgTypeParameter, StringComparison.OrdinalIgnoreCase))
{
string msgType = FormattingUtilities.UnquoteToken(parameter.Value);
if (!msgType.Equals(isRequest ? DefaultRequestMsgType : DefaultResponseMsgType, StringComparison.OrdinalIgnoreCase))
{
if (throwOnError)
{
throw Error.Argument("content", Resources.HttpMessageInvalidMediaType, FormattingUtilities.HttpContentType.Name, isRequest ? DefaultRequestMediaType : DefaultResponseMediaType);
}
else
{
return(false);
}
}
return(true);
}
}
}
if (throwOnError)
{
throw Error.Argument("content", Resources.HttpMessageInvalidMediaType, FormattingUtilities.HttpContentType.Name, isRequest ? DefaultRequestMediaType : DefaultResponseMediaType);
}
else
{
return(false);
}
}
/// <summary>
/// Copies the unsorted header fields to a sorted collection.
/// </summary>
/// <param name="source">The unsorted source headers</param>
/// <param name="destination">The destination <see cref="HttpRequestHeaders"/> or <see cref="HttpResponseHeaders"/>.</param>
/// <param name="contentStream">The input <see cref="Stream"/> used to form any <see cref="HttpContent"/> being part of this HTTP request.</param>
/// <param name="rewind">Start location of any request entity within the <paramref name="contentStream"/>.</param>
/// <returns>An <see cref="HttpContent"/> instance if header fields contained and <see cref="HttpContentHeaders"/>.</returns>
private static HttpContent CreateHeaderFields(HttpHeaders source, HttpHeaders destination, Stream contentStream, int rewind)
{
Contract.Assert(source != null, "source headers cannot be null");
Contract.Assert(destination != null, "destination headers cannot be null");
Contract.Assert(contentStream != null, "contentStream must be non null");
HttpContentHeaders contentHeaders = null;
HttpContent content = null;
// Set the header fields
foreach (KeyValuePair <string, IEnumerable <string> > header in source)
{
if (!destination.TryAddWithoutValidation(header.Key, header.Value))
{
if (contentHeaders == null)
{
contentHeaders = FormattingUtilities.CreateEmptyContentHeaders();
}
contentHeaders.TryAddWithoutValidation(header.Key, header.Value);
}
}
// If we have content headers then create an HttpContent for this Response
if (contentHeaders != null)
{
// Need to rewind the input stream to be at the position right after the HTTP header
// which we may already have parsed as we read the content stream.
if (!contentStream.CanSeek)
{
throw Error.InvalidOperation(Resources.HttpMessageContentStreamMustBeSeekable, "ContentReadStream", FormattingUtilities.HttpResponseMessageType.Name);
}
contentStream.Seek(0 - rewind, SeekOrigin.Current);
content = new StreamContent(contentStream);
contentHeaders.CopyTo(content.Headers);
}
return(content);
}
/// <summary>
/// Read the non-file contents as form data.
/// </summary>
/// <returns>A <see cref="Task"/> representing the post processing.</returns>
public static async Task ReadFormDataAsync(Collection <HttpContent> contents,
NameValueCollection formData, CancellationToken cancellationToken)
{
// Find instances of HttpContent for which we created a memory stream and read them asynchronously
// to get the string content and then add that as form data
foreach (HttpContent content in contents)
{
ContentDispositionHeaderValue contentDisposition = content.Headers.ContentDisposition;
// If FileName is null or empty, the content is form data and will be processed.
if (String.IsNullOrEmpty(contentDisposition.FileName))
{
// Extract name from Content-Disposition header. We know from earlier that the header is present.
string formFieldName = FormattingUtilities.UnquoteToken(contentDisposition.Name) ?? String.Empty;
// Read the contents as string data and add to form data
cancellationToken.ThrowIfCancellationRequested();
string formFieldValue = await content.ReadAsStringAsync();
formData.Add(formFieldName, formFieldValue);
}
}
}
