/// <summary>Builds a Content-Type header which includes media type and encoding information.</summary>
/// <param name="mediaType">Media type to be used.</param>
/// <param name="encoding">Encoding to be used in response, possibly null.</param>
/// <returns>The value for the Content-Type header.</returns>
internal static string BuildContentType(MediaType mediaType, Encoding encoding)
{
Debug.Assert(mediaType != null, "mediaType != null");
return(mediaType.ToText(encoding));
}
/// <summary>
/// Append default values required by OData to specified HTTP header.
///
/// When header name is ODataConstants.ContentTypeHeader:
/// If header value is application/json, append the following default values:
/// odata.metadata=minimal
/// odata.streaming=true
/// IEEE754Compatible=false
/// </summary>
/// <param name="headerName">The name of the header to append default values.</param>
/// <param name="headerValue">The original header value string.</param>
/// <returns>The header value string with appended default values.</returns>
public static string AppendDefaultHeaderValue(string headerName, string headerValue)
{
if (string.CompareOrdinal(headerName, ODataConstants.ContentTypeHeader) != 0)
{
return(headerValue);
}
if (headerValue == null)
{
return(null);
}
var mediaTypeList = HttpUtils.MediaTypesFromString(headerValue);
var mediaType = mediaTypeList.Single().Key;
if (string.CompareOrdinal(mediaType.FullTypeName, MimeConstants.MimeApplicationJson) != 0)
{
return(headerValue);
}
var extendedParameters = new List <KeyValuePair <string, string> >();
var extendedMediaType = new MediaType(mediaType.TypeName, mediaType.SubTypeName, extendedParameters);
var hasMetadata = false;
var hasStreaming = false;
var hasIeee754Compatible = false;
if (mediaType.Parameters != null)
{
foreach (var parameter in mediaType.Parameters)
{
extendedParameters.Add(parameter);
if (string.CompareOrdinal(parameter.Key, MimeConstants.MimeMetadataParameterName) == 0)
{
hasMetadata = true;
}
if (string.CompareOrdinal(parameter.Key, MimeConstants.MimeStreamingParameterName) == 0)
{
hasStreaming = true;
}
if (string.CompareOrdinal(parameter.Key, MimeConstants.MimeIeee754CompatibleParameterName) == 0)
{
hasIeee754Compatible = true;
}
}
}
if (!hasMetadata)
{
extendedMediaType.Parameters.Add(new KeyValuePair <string, string>(
MimeConstants.MimeMetadataParameterName,
MimeConstants.MimeMetadataParameterValueMinimal));
}
if (!hasStreaming)
{
extendedMediaType.Parameters.Add(new KeyValuePair <string, string>(
MimeConstants.MimeStreamingParameterName,
MimeConstants.MimeParameterValueTrue));
}
if (!hasIeee754Compatible)
{
extendedMediaType.Parameters.Add(new KeyValuePair <string, string>(
MimeConstants.MimeIeee754CompatibleParameterName,
MimeConstants.MimeParameterValueFalse));
}
return(extendedMediaType.ToText());
}