/// <summary>
/// Creates a set of transformed route values that will be used to select an action.
/// </summary>
/// <param name="httpContext">The <see cref="HttpContext"/> associated with the current request.</param>
/// <param name="values">The route values associated with the current match.</param>
/// <returns>A task which asynchronously returns a set of route values.</returns>
public override ValueTask <RouteValueDictionary> TransformAsync(HttpContext httpContext, RouteValueDictionary values)
{
if (httpContext == null)
{
throw Error.ArgumentNull(nameof(httpContext));
}
if (values == null)
{
throw Error.ArgumentNull(nameof(values));
}
if (httpContext.ODataFeature().Path != null)
{
// Noted: if there's a route mapping with ODataPrefix == null,
// for example: router.MapODataRoute(routeName: "odata", routePrefix: null, ...)
// This route will match all requests.
// Therefore, this route will be a candidate and its tranformer will be called.
// So, we use the ODataPath setting to verify whether the request is transformed or not.
// Maybe we have a better solution later.
return(new ValueTask <RouteValueDictionary>(result: null));
}
(string routeName, object oDataPathValue) = values.GetODataRouteInfo();
if (routeName != null)
{
HttpRequest request = httpContext.Request;
string oDataPath = oDataPathValue as string;
// Create request container
request.CreateRequestContainer(routeName);
// Check whether the request is a POST targeted at a resource path ending in /$query
if (request.IsQueryRequest(oDataPath))
{
request.TransformQueryRequest();
oDataPath = oDataPath.Substring(0, oDataPath.LastIndexOf('/' + ODataRouteConstants.QuerySegment, StringComparison.OrdinalIgnoreCase));
values[ODataRouteConstants.ODataPath] = oDataPath;
}
// We need to call Uri.GetLeftPart(), which returns an encoded Url.
// The ODL parser does not like raw values.
Uri requestUri = new Uri(request.GetEncodedUrl());
string requestLeftPart = requestUri.GetLeftPart(UriPartial.Path);
string queryString = request.QueryString.HasValue ? request.QueryString.ToString() : null;
// Call ODL to parse the Request URI.
ODataPath path = ODataPathRouteConstraint.GetODataPath(oDataPath, requestLeftPart, queryString, () => request.GetRequestContainer());
if (path != null)
{
// Set all the properties we need for routing, querying, formatting
IODataFeature odataFeature = httpContext.ODataFeature();
odataFeature.Path = path;
odataFeature.RouteName = routeName;
odataFeature.IsEndpointRouting = true; // mark as Endpoint routing
// Noted: we inject the ActionSelector and use it to select the best OData action.
// In .NET 5 or later, this maybe change.
RouteContext routeContext = new RouteContext(httpContext);
var condidates = _selector.SelectCandidates(routeContext);
var actionDescriptor = _selector.SelectBestCandidate(routeContext, condidates);
ControllerActionDescriptor controllerActionDescriptor = actionDescriptor as ControllerActionDescriptor;
if (controllerActionDescriptor != null)
{
RouteValueDictionary newValues = new RouteValueDictionary();
foreach (var item in values)
{
newValues.Add(item.Key, item.Value);
}
foreach (var item in routeContext.RouteData.Values)
{
newValues[item.Key] = item.Value;
}
newValues["controller"] = controllerActionDescriptor.ControllerName;
newValues["action"] = controllerActionDescriptor.ActionName;
newValues["odataPath"] = oDataPathValue;
// Noted, here's a working around for mulitiple actions in same controller.
// For example, we have two "Get" methods in same controller, in order to help "EndpointSelector"
// to select the correct Endpoint, we save the ActionDescriptor value into ODataFeature.
odataFeature.ActionDescriptor = controllerActionDescriptor;
// Add handler to handle options calls. The routing criteria has been patched to allow endpoint discovery using the correct cors headers
if (request.Method.Equals("OPTIONS", StringComparison.OrdinalIgnoreCase))
{
var metadata = actionDescriptor.EndpointMetadata;
// For option request can set this as the action will be handled by the cors middleware
var metadataCollection = metadata?.Any() == true
? new EndpointMetadataCollection(metadata)
: EndpointMetadataCollection.Empty;
// This workaround allows the default cors middleware to read the annotations if the user has them enabling fine-grained cors access control with endpoints
var endpoint = new Endpoint(null, metadataCollection, controllerActionDescriptor.ActionName);
httpContext.SetEndpoint(endpoint);
}
return(new ValueTask <RouteValueDictionary>(newValues));
}
}
else
{
// The request doesn't match this route so dispose the request container.
request.DeleteRequestContainer(true);
}
}
return(new ValueTask <RouteValueDictionary>(result: null));
}
/// <summary>
/// Creates a set of transformed route values that will be used to select an action.
/// </summary>
/// <param name="httpContext">The <see cref="HttpContext"/> associated with the current request.</param>
/// <param name="values">The route values associated with the current match.</param>
/// <returns>A task which asynchronously returns a set of route values.</returns>
public override ValueTask <RouteValueDictionary> TransformAsync(HttpContext httpContext, RouteValueDictionary values)
{
if (httpContext == null)
{
throw Error.ArgumentNull(nameof(httpContext));
}
if (values == null)
{
throw Error.ArgumentNull(nameof(values));
}
if (httpContext.ODataFeature().Path != null)
{
// Noted: if there's a route mapping with ODataPrefix == null,
// for example: router.MapODataRoute(routeName: "odata", routePrefix: null, ...)
// This route will match all requests.
// Therefore, this route will be a candidate and its tranformer will be called.
// So, we use the ODataPath setting to verify whether the request is transformed or not.
// Maybe we have a better solution later.
return(new ValueTask <RouteValueDictionary>(result: null));
}
(string routeName, object oDataPathValue) = values.GetODataRouteInfo();
if (routeName != null)
{
HttpRequest request = httpContext.Request;
// We need to call Uri.GetLeftPart(), which returns an encoded Url.
// The ODL parser does not like raw values.
Uri requestUri = new Uri(request.GetEncodedUrl());
string requestLeftPart = requestUri.GetLeftPart(UriPartial.Path);
string queryString = request.QueryString.HasValue ? request.QueryString.ToString() : null;
// Call ODL to parse the Request URI.
ODataPath path = ODataPathRouteConstraint.GetODataPath(oDataPathValue as string, requestLeftPart, queryString, () => request.CreateRequestContainer(routeName));
if (path != null)
{
// Set all the properties we need for routing, querying, formatting
IODataFeature odataFeature = httpContext.ODataFeature();
odataFeature.Path = path;
odataFeature.RouteName = routeName;
odataFeature.IsEndpointRouting = true; // mark as Endpoint routing
// Noted: we inject the ActionSelector and use it to select the best OData action.
// In .NET 5 or later, this maybe change.
RouteContext routeContext = new RouteContext(httpContext);
var condidates = _selector.SelectCandidates(routeContext);
var actionDescriptor = _selector.SelectBestCandidate(routeContext, condidates);
ControllerActionDescriptor controllerActionDescriptor = actionDescriptor as ControllerActionDescriptor;
if (controllerActionDescriptor != null)
{
RouteValueDictionary newValues = new RouteValueDictionary();
foreach (var item in values)
{
newValues.Add(item.Key, item.Value);
}
foreach (var item in routeContext.RouteData.Values)
{
newValues[item.Key] = item.Value;
}
newValues["controller"] = controllerActionDescriptor.ControllerName;
newValues["action"] = controllerActionDescriptor.ActionName;
newValues["odataPath"] = oDataPathValue;
// Noted, here's a working around for mulitiple actions in same controller.
// For example, we have two "Get" methods in same controller, in order to help "EndpointSelector"
// to select the correct Endpoint, we save the ActionDescriptor value into ODataFeature.
odataFeature.ActionDescriptor = controllerActionDescriptor;
return(new ValueTask <RouteValueDictionary>(newValues));
}
}
else
{
// The request doesn't match this route so dispose the request container.
request.DeleteRequestContainer(true);
}
}
return(new ValueTask <RouteValueDictionary>(result: null));
}