/// <summary>
/// Helper method to find the service document of the OData service this context refers to
/// </summary>
/// <param name="maximumPayloadSize">maximum payload size in byte</param>
/// <param name="uri">uri hint, which is used to derive various possible uris in hope one of them is the service base endpoint</param>
/// <param name="acceptHeaderValue">value of header of Accept that will be used in request getting the response</param>
/// <param name="IgnoreInputUri">if true, the given uri is known other than service base</param>
/// <param name="serviceBaseUri">out parameter: the service base uri if one shall be found</param>
/// <param name="responseServiceDocument">out parameter: the response object including payload, headers and status code</param>
/// <param name="reqHeaders">Http headers to be sent out to server</param>
/// <returns>true if a valid service document is found; otherwise false</returns>
private static bool TryGetServiceDocument(int maximumPayloadSize,
Uri uri,
string acceptHeaderValue,
bool IgnoreInputUri,
out Uri serviceBaseUri,
out Response responseServiceDocument,
IEnumerable <KeyValuePair <string, string> > reqHeaders)
{
if (!IgnoreInputUri)
{
try
{
var response = WebHelper.Get(uri, acceptHeaderValue, maximumPayloadSize, reqHeaders);
if (response.IsServiceDocument())
{
serviceBaseUri = uri;
responseServiceDocument = response;
return(true);
}
}
catch (OversizedPayloadException)
{
// does nothing
}
}
var segments = uri.Segments;
if (segments != null && segments.Length > 0)
{
Uri uriParent;
if (Uri.TryCreate(uri.GetLeftPart(UriPartial.Authority) + string.Join("", segments.Take(segments.Length - 1).ToArray()), UriKind.Absolute, out uriParent))
{
if (uri != uriParent)
{
return(ServiceContextFactory.TryGetServiceDocument(maximumPayloadSize, uriParent, acceptHeaderValue, false, out serviceBaseUri, out responseServiceDocument, reqHeaders));
}
}
}
serviceBaseUri = null;
responseServiceDocument = null;
return(false);
}
/// <summary>
/// Factory method to set up the OData Interop context based on uri, desired format and job id
/// </summary>
/// <param name="destination">uri string pointing to a OData service endpoint</param>
/// <param name="format">format preference, could be either "atom" or "json" - default and falling back to atom</param>
/// <param name="jobId">unique identifier to tag this context</param>
/// <param name="maximumPayloadSize">the maximum number of bytes rule engine is willing to retrieve from the Uri provided</param>
/// <param name="reqHeaders">Http headers sent as part of request</param>
/// <returns>context object representing the interop request session</returns>
public static ServiceContext Create(string destination, string format, Guid jobId, int maximumPayloadSize, IEnumerable <KeyValuePair <string, string> > reqHeaders, string category = "core")
{
Uri inputUri;
Uri serviceBaseUri = null;
string serviceDocument = null;
string metadataDocument = null;
string entityType = null;
string jsonFullMetadataPayload = null;
var serviceStatus = ServiceStatus.GetInstance();
if (string.IsNullOrEmpty(format))
{
throw new ArgumentException(Resource.ArgumentNotNullOrEmpty, "format");
}
try
{
if (destination.EndsWith(@"/"))
{
destination = destination.TrimEnd('/');
}
inputUri = new Uri(destination);
}
catch (UriFormatException)
{
if (!destination.StartsWith(@"http://") && !destination.StartsWith(@"https://"))
{
inputUri = new Uri(SupportedScheme.SchemeHttp + "://" + destination);
}
else
{
inputUri = new Uri(Uri.EscapeUriString(destination));
}
}
if (!SupportedScheme.Instance.Contains(inputUri.Scheme))
{
throw new ArgumentException(
string.Format(CultureInfo.CurrentCulture, Resource.formatSchemeNotSupported, inputUri.Scheme),
"destination");
}
string acceptHeader = ServiceContextFactory.MapFormatToAcceptValue(format);
ODataMetadataType odataMetadata = ServiceContextFactory.MapFormatToMetadataType(format);
Response response = WebHelper.Get(inputUri, acceptHeader, maximumPayloadSize, reqHeaders);
if (response.StatusCode == HttpStatusCode.NotFound)
{
return(null);
}
var payloadFormat = response.ResponsePayload.GetFormatFromPayload();
var payloadType = ContextHelper.GetPayloadType(response.ResponsePayload, payloadFormat, response.ResponseHeaders);
switch (payloadType)
{
case PayloadType.ServiceDoc:
serviceBaseUri = inputUri;
serviceDocument = response.ResponsePayload;
break;
case PayloadType.Metadata:
if (inputUri.AbsoluteUri.EndsWith(Constants.OptionMetadata, StringComparison.Ordinal))
{
if (payloadFormat == PayloadFormat.JsonLight)
{
serviceBaseUri = new Uri(serviceStatus.RootURL);
serviceDocument = serviceStatus.ServiceDocument;
}
else
{
serviceBaseUri = new Uri(inputUri.AbsoluteUri.Substring(0, inputUri.AbsoluteUri.Length - Constants.OptionMetadata.Length));
var respSvcDoc = WebHelper.Get(serviceBaseUri, acceptHeader, maximumPayloadSize, reqHeaders);
serviceDocument = respSvcDoc.ResponsePayload;
}
}
break;
default:
if (payloadType.IsValidPayload())
{
string fullPath = inputUri.GetLeftPart(UriPartial.Path).TrimEnd('/');
var uriPath = new Uri(fullPath);
Uri baseUri;
Response serviceDoc;
if (ServiceContextFactory.TryGetServiceDocument(maximumPayloadSize, uriPath, acceptHeader, uriPath.AbsoluteUri == fullPath, out baseUri, out serviceDoc, reqHeaders))
{
serviceBaseUri = baseUri;
serviceDocument = serviceDoc.ResponsePayload;
}
}
break;
}
if (payloadType == PayloadType.Metadata)
{
metadataDocument = response.ResponsePayload;
}
else
{
if (serviceBaseUri != null)
{
if (payloadFormat == PayloadFormat.JsonLight && payloadType == PayloadType.ServiceDoc)
{
metadataDocument = serviceStatus.MetadataDocument;
}
else
{
try
{
string metadataURL = serviceBaseUri.AbsoluteUri.EndsWith(@"/") ? Constants.OptionMetadata.TrimStart('/') : Constants.OptionMetadata;
var responseMetadata = WebHelper.Get(new Uri(serviceBaseUri.AbsoluteUri + metadataURL), null, maximumPayloadSize, reqHeaders);
if (responseMetadata != null)
{
metadataDocument = responseMetadata.ResponsePayload;
}
}
catch (OversizedPayloadException)
{
// do nothing
}
}
}
}
if (payloadFormat == PayloadFormat.JsonLight)
{
try
{
// Specify full metadata accept header
string acceptHeaderOfFullMetadata = string.Empty;
if (acceptHeader.Equals(Constants.V3AcceptHeaderJsonFullMetadata) ||
acceptHeader.Equals(Constants.V3AcceptHeaderJsonMinimalMetadata) ||
acceptHeader.Equals(Constants.V3AcceptHeaderJsonNoMetadata))
{
acceptHeaderOfFullMetadata = Constants.V3AcceptHeaderJsonFullMetadata;
}
else
{
acceptHeaderOfFullMetadata = Constants.V4AcceptHeaderJsonFullMetadata;
}
// Send full metadata request and get full metadata response.
var responseFullMetadata = WebHelper.Get(inputUri, acceptHeaderOfFullMetadata, maximumPayloadSize, reqHeaders);
if (responseFullMetadata != null)
{
jsonFullMetadataPayload = responseFullMetadata.ResponsePayload;
entityType = jsonFullMetadataPayload.GetFullEntityType(payloadType, payloadFormat, metadataDocument);
}
}
catch (OversizedPayloadException)
{
// do nothing
}
}
else
{
entityType = response.ResponsePayload.GetFullEntityType(payloadType, payloadFormat, metadataDocument);
}
return(new ServiceContext(inputUri,
jobId,
response.StatusCode,
response.ResponseHeaders,
response.ResponsePayload,
entityType,
serviceBaseUri,
serviceDocument,
metadataDocument,
false,
reqHeaders,
odataMetadata,
jsonFullMetadataPayload,
category));
}
