public void ComprehendRequestHeaders()
{
string etag = _etag;
string[] ifMatch = _request.GetHeaderUnmodified("If-Match");
if (ifMatch != null)
{
_ifMatchState = PreconditionState.PreconditionFailed;
foreach (var segment in new HeaderSegmentCollection(ifMatch))
{
if (segment.Data.Equals(etag, StringComparison.Ordinal))
{
_ifMatchState = PreconditionState.ShouldProcess;
break;
}
}
}
string[] ifNoneMatch = _request.GetHeaderUnmodified("If-None-Match");
if (ifNoneMatch != null)
{
_ifNoneMatchState = PreconditionState.ShouldProcess;
foreach (var segment in new HeaderSegmentCollection(ifNoneMatch))
{
if (segment.Data.Equals(etag, StringComparison.Ordinal))
{
_ifNoneMatchState = PreconditionState.NotModified;
break;
}
}
}
string ifModifiedSince = _request.GetHeader("If-Modified-Since");
if (ifModifiedSince != null)
{
bool matches = string.Equals(ifModifiedSince, _lastModifiedString, StringComparison.Ordinal);
_ifModifiedSinceState = matches ? PreconditionState.NotModified : PreconditionState.ShouldProcess;
}
string ifUnmodifiedSince = _request.GetHeader("If-Unmodified-Since");
if (ifUnmodifiedSince != null)
{
bool matches = string.Equals(ifModifiedSince, _lastModifiedString, StringComparison.Ordinal);
_ifUnmodifiedSinceState = matches ? PreconditionState.ShouldProcess : PreconditionState.PreconditionFailed;
}
}
public static bool TryParseAuthorizationHeader(OwinRequest request,
out AuthenticationHeaderValue authorization, out string error)
{
string[] unparsedHeaders = request.GetHeaderUnmodified("Authorization");
string unparsedHeader;
if (unparsedHeaders != null)
{
if (unparsedHeaders.Length == 1)
{
unparsedHeader = unparsedHeaders[0];
}
else
{
authorization = null;
// TODO: Get error messages from resources.
error = "Only one Authorization header may be present.";
return(false);
}
}
else
{
unparsedHeader = null;
}
AuthenticationHeaderValue parsedHeader;
if (unparsedHeader != null)
{
if (!AuthenticationHeaderValue.TryParse(unparsedHeader, out parsedHeader))
{
authorization = null;
// TODO: Get error messages from resources.
error = "The Authorization header is malformed.";
return(false);
}
}
else
{
parsedHeader = null;
}
authorization = parsedHeader;
error = null;
return(true);
}
private IEncoding SelectCompression(IDictionary <string, object> environment)
{
var request = new OwinRequest(environment);
var bestAccept = new Accept {
Encoding = "identity", Quality = 0
};
IEncoding bestEncoding = null;
string[] acceptEncoding = request.GetHeaderUnmodified("accept-encoding");
if (acceptEncoding != null)
{
foreach (var segment in new HeaderSegmentCollection(acceptEncoding))
{
if (!segment.Data.HasValue)
{
continue;
}
Accept accept = Parse(segment.Data.Value);
if (accept.Quality == 0 || accept.Quality < bestAccept.Quality)
{
continue;
}
IEncoding compression = _options.EncodingProvider.GetCompression(accept.Encoding);
if (compression == null)
{
continue;
}
bestAccept = accept;
bestEncoding = compression;
if (accept.Quality == 1000)
{
break;
}
}
}
return(bestEncoding);
}