internal static void AddPreflightOperations(ServiceEndpoint endpoint, List <OperationDescription> corsOperations)
{
Dictionary <string, PreflightOperationBehavior> uriTemplates = new Dictionary <string, PreflightOperationBehavior>(StringComparer.OrdinalIgnoreCase);
//
foreach (OperationDescription operation in corsOperations)
{
if (operation.Behaviors.Find <WebGetAttribute>() != null || operation.IsOneWay == true)
{
// no need to add preflight operation for GET requests, no support for 1-way messages
continue;
}
//
WebInvokeAttribute originalWia = operation.Behaviors.Find <WebInvokeAttribute>();
string originalUriTemplate = ((originalWia != null && originalWia.UriTemplate != null) ? NormalizeTemplate(originalWia.UriTemplate) : operation.Name);
//
string originalMethod = ((originalWia != null && originalWia.Method != null) ? originalWia.Method : "POST");
if (uriTemplates.ContainsKey(originalUriTemplate) == true)
{
// there is already an OPTIONS operation for this URI, we can reuse it
PreflightOperationBehavior operationBehavior = uriTemplates[originalUriTemplate];
operationBehavior.AddAllowedMethod(originalMethod);
}
else
{
ContractDescription contract = operation.DeclaringContract;
PreflightOperationBehavior preflightOperationBehavior = null;
OperationDescription preflightOperation = CreatePreflightOperation(operation, originalUriTemplate, originalMethod, out preflightOperationBehavior);
uriTemplates.Add(originalUriTemplate, preflightOperationBehavior);
//
contract.Operations.Add(preflightOperation);
}
}
}
private void addPreflightOperations(ServiceEndpoint endpoint)
{
List <OperationDescription> corsEnabledOperations = endpoint.Contract.Operations.Where(_ => _.Behaviors.Find <CORSEnabledOperationAttribute>() != null).ToList();
if (corsEnabledOperations != null && corsEnabledOperations.Any() == true)
{
PreflightOperationBehavior.AddPreflightOperations(endpoint, corsEnabledOperations);
}
}
internal static OperationDescription CreatePreflightOperation(OperationDescription operation, string originalUriTemplate, string originalMethod, out PreflightOperationBehavior preflightOperationBehavior)
{
ContractDescription contract = operation.DeclaringContract;
//
// create new Operation Contract for the Method="OPTIONS"
OperationDescription ret = new OperationDescription(operation.Name + CORSEnabledOperationAttribute.PreflightSuffix, contract);
//
// configure Messages
{
MessageDescription inputMessage = new MessageDescription(operation.Messages[0].Action + CORSEnabledOperationAttribute.PreflightSuffix, MessageDirection.Input);
inputMessage.Body.Parts.Add(new MessagePartDescription("input", contract.Namespace)
{
Index = 0, Type = typeof(Message)
});
ret.Messages.Add(inputMessage);
}
{
MessageDescription outputMessage = new MessageDescription(operation.Messages[1].Action + CORSEnabledOperationAttribute.PreflightSuffix, MessageDirection.Output);
outputMessage.Body.ReturnValue = new MessagePartDescription(ret.Name + "Return", contract.Namespace)
{
Type = typeof(Message)
};
ret.Messages.Add(outputMessage);
}
//
// configure Behaviors
{
// configure default Behaviors
ret.Behaviors.Add(new WebInvokeAttribute()
{
Method = "OPTIONS", UriTemplate = originalUriTemplate,
});
ret.Behaviors.Add(new DataContractSerializerOperationBehavior(ret));
//
// configure custom Behavior
preflightOperationBehavior = new PreflightOperationBehavior(ret);
preflightOperationBehavior.AddAllowedMethod(originalMethod);
ret.Behaviors.Add(preflightOperationBehavior);
}
//
return(ret);
}