public Func <Stream, Stream> GetEncoder(
HttpHeaderValueCollection <StringWithQualityHeaderValue> list)
{
if (list != null && list.Count > 0)
{
var headerValue = list.OrderByDescending(e => e.Quality ?? 1.0D)
.Where(e => !e.Quality.HasValue ||
e.Quality.Value > 0.0D)
.FirstOrDefault(e => supported.Keys
.Contains(e.Value, StringComparer.OrdinalIgnoreCase));
// Case 1: We can support what client has asked for
if (headerValue != null)
{
return(GetStreamForSchema(headerValue.Value));
}
// Case 2: Client is okay to accept any thing we support except
// the ones explicitly specified as not preferred by setting q=0
if (list.Any(e => e.Value == "*" &&
(!e.Quality.HasValue || e.Quality.Value > 0.0D)))
{
var encoding = supported.Keys.Where(se =>
!list.Any(e =>
e.Value.Equals(se, StringComparison.OrdinalIgnoreCase) &&
e.Quality.HasValue &&
e.Quality.Value == 0.0D))
.FirstOrDefault();
if (encoding != null)
{
return(GetStreamForSchema(encoding));
}
}
// Case 3: Client specifically refusing identity
if (list.Any(e => e.Value.Equals(IDENTITY, StringComparison.OrdinalIgnoreCase) &&
e.Quality.HasValue && e.Quality.Value == 0.0D))
{
throw new NegotiationFailedException();
}
// Case 4: Client is not willing to accept one of the encodings
// we support and is not willing to accept identity
if (list.Any(e => e.Value == "*" &&
(e.Quality.HasValue || e.Quality.Value == 0.0D)))
{
if (!list.Any(e => e.Value.Equals(IDENTITY, StringComparison.OrdinalIgnoreCase)))
{
throw new NegotiationFailedException();
}
}
}
// Settle for the default, which is no transformation whatsoever
return(null);
}
private static IEnumerable <MediaTypeWithQualityHeaderValue> SortByQFactor(HttpHeaderValueCollection <MediaTypeWithQualityHeaderValue> acceptHeaders)
{
if (acceptHeaders.Count > 1)
{
// Sort accept headers (if more than 1) in descending order based on q factor
// Use OrderBy() instead of Array.Sort() as it performs fewer comparisons. In this case the comparisons
// are quite expensive so OrderBy() performs better.
return(acceptHeaders.OrderByDescending(m => m, MediaTypeWithQualityHeaderValueComparer.QualityComparer));
}
else
{
return(acceptHeaders);
}
}
public Func <Stream, Stream> GetEncoder(HttpHeaderValueCollection <StringWithQualityHeaderValue> list)
{
if (list != null && list.Count() > 0)
{
var headerValue = list.OrderByDescending(e => e.Quality ?? 1.0D)
.Where(e => !e.Quality.HasValue ||
e.Quality.Value > 0.0D)
.FirstOrDefault(e => supported.Keys
.Contains(e.Value, StringComparer.OrdinalIgnoreCase));
if (headerValue != null)
{
return(GetStreamForSchema(headerValue.Value));
}
if (list.Any(e => e.Value == "*" &&
(!e.Quality.HasValue || e.Quality.Value > 0.0D)))
{
var encoding = supported.Keys.Where(se =>
!list.Any(e =>
e.Value.Equals(se, StringComparison.OrdinalIgnoreCase) &&
e.Quality.HasValue &&
e.Quality.Value == 0.0D))
.FirstOrDefault();
if (encoding != null)
{
return(GetStreamForSchema(encoding));
}
}
if (list.Any(e => e.Value.Equals(IDENTITY, StringComparison.OrdinalIgnoreCase) &&
e.Quality.HasValue && e.Quality.Value == 0.0D))
{
throw new NegotiationFailedException();
}
// Case 4: Client is not willing to accept one of the encodings
// we support and is not willing to accept identity
if (list.Any(e => e.Value == "*" &&
(e.Quality.HasValue || e.Quality.Value == 0.0D)))
{
if (!list.Any(e => e.Value.Equals(IDENTITY, StringComparison.OrdinalIgnoreCase)))
{
throw new NegotiationFailedException();
}
}
}
return(null);
}
internal static Task <HttpResponseMessage> CreateODataBatchResponseAsync(this HttpRequestMessage request, IEnumerable <ODataBatchResponseItem> responses, ODataMessageQuotas messageQuotas)
{
Contract.Assert(request != null);
ODataVersion odataVersion = ResultHelpers.GetODataResponseVersion(request);
IServiceProvider requestContainer = request.GetRequestContainer();
ODataMessageWriterSettings writerSettings =
requestContainer.GetRequiredService <ODataMessageWriterSettings>();
writerSettings.Version = odataVersion;
writerSettings.MessageQuotas = messageQuotas;
HttpHeaderValueCollection <MediaTypeWithQualityHeaderValue> acceptHeaderValues = request.Headers.Accept;
MediaTypeHeaderValue responseContentType = null;
foreach (MediaTypeWithQualityHeaderValue acceptHeader in acceptHeaderValues.OrderByDescending(h => h.Quality == null ? 1 : h.Quality))
{
if (acceptHeader.MediaType.Equals(ODataBatchHttpRequestMessageExtensions.BatchMediaTypeMime, StringComparison.OrdinalIgnoreCase))
{
responseContentType = MediaTypeHeaderValue.Parse(
String.Format(CultureInfo.InvariantCulture, "multipart/mixed;boundary=batchresponse_{0}",
Guid.NewGuid()));
break;
}
else if (acceptHeader.MediaType.Equals(ODataBatchHttpRequestMessageExtensions.BatchMediaTypeJson, StringComparison.OrdinalIgnoreCase))
{
responseContentType = MediaTypeHeaderValue.Parse(ODataBatchHttpRequestMessageExtensions.BatchMediaTypeJson);
break;
}
}
if (responseContentType == null)
{
// In absence of accept, if request was JSON then default response to be JSON.
// Note that, if responseContentType is not set, then it will default to multipart/mixed
// when constructing the BatchContent, so we don't need to handle that case here
if (request.Content != null && request.Content.Headers.Any(h => String.Equals(h.Key, ODataBatchHttpRequestMessageExtensions.ContentType, StringComparison.OrdinalIgnoreCase) &&
h.Value.Any(v => v.IndexOf(ODataBatchHttpRequestMessageExtensions.BatchMediaTypeJson, StringComparison.OrdinalIgnoreCase) > -1)))
{
responseContentType = MediaTypeHeaderValue.Parse(ODataBatchHttpRequestMessageExtensions.BatchMediaTypeJson);
}
}
HttpResponseMessage response = request.CreateResponse(HttpStatusCode.OK);
response.Content = new ODataBatchContent(responses, requestContainer, responseContentType);
return(Task.FromResult(response));
}
public Func<Stream, Stream> GetEncoder(HttpHeaderValueCollection<StringWithQualityHeaderValue> list)
{
// The following steps will walk you through
// completing the implementation of this method
if (list != null && list.Count > 0)
{
// More code goes here
var headerValue = list.OrderByDescending(e => e.Quality ?? 1.0D).Where(e => !e.Quality.HasValue || e.Quality.Value > 0.0D).FirstOrDefault(e => supported.Keys.Contains(e.Value, StringComparer.OrdinalIgnoreCase));
// Case 1: We can support what client has asked for
if (headerValue != null)
return GetStreamForSchema(headerValue.Value);
// Case 2: Client will accept anything we support except
// the ones explicitly specified as not preferred by setting q=0
if (list.Any(e => e.Value == "*" &&
(!e.Quality.HasValue || e.Quality.Value > 0.0D)))
{
var encoding = supported.Keys.Where(se =>
!list.Any(e =>
e.Value.Equals(se, StringComparison.OrdinalIgnoreCase) &&
e.Quality.HasValue &&
e.Quality.Value == 0.0D))
.FirstOrDefault();
if (encoding != null)
return GetStreamForSchema(encoding);
}
// Case 3: Client specifically refusing identity
if (list.Any(e => e.Value.Equals(IDENTITY, StringComparison.OrdinalIgnoreCase) &&
e.Quality.HasValue && e.Quality.Value == 0.0D))
{
throw new NegotiationFailedException();
}
// Case 4: Client is not willing to accept any of the encodings
// we support and is not willing to accept identity
if (list.Any(e => e.Value == "*" &&
(e.Quality.HasValue || e.Quality.Value == 0.0D)))
{
if (!list.Any(e => e.Value.Equals(IDENTITY, StringComparison.OrdinalIgnoreCase)))
throw new NegotiationFailedException();
}
}
// Settle for the default, which is no transformation whatsoever
return null;
}
protected override async Task <HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
{
HttpHeaderValueCollection <StringWithQualityHeaderValue> acceptedLanguages = request.Headers.AcceptLanguage;
if (acceptedLanguages.IsNotNullOrEmpty())
{
StringWithQualityHeaderValue headerValue = acceptedLanguages.OrderByDescending(e => e.Quality ?? 1.0D)
.Where(e => !e.Quality.HasValue || e.Quality.Value > 0.0D)
.FirstOrDefault(e => supportedCultures.Contains(e.Value, StringComparer.OrdinalIgnoreCase));
string culture = null;
// Case 1: We can support what client has asked for
if (headerValue.IsNotNull())
{
culture = headerValue.Value;
}
// Case 2: Client is okay to accept any thing we support except
// the ones explicitly specified as not preferred by setting q=0
else if (acceptedLanguages.Any(e => e.Value == "*" && (!e.Quality.HasValue || e.Quality.Value > 0.0D)))
{
culture = supportedCultures.Where(sc =>
!acceptedLanguages.Any(e =>
e.Value.Equals(sc, StringComparison.OrdinalIgnoreCase) &&
e.Quality.HasValue &&
e.Quality.Value == 0.0D))
.FirstOrDefault();
}
if (culture.IsNotNull())
{
Thread.CurrentThread.CurrentUICulture = CultureInfo.GetCultureInfo(culture);
Thread.CurrentThread.CurrentCulture = Thread.CurrentThread.CurrentUICulture;
}
}
return(await base.SendAsync(request, cancellationToken));
}
