Esempio n. 1
0
        private DynamicControllerEndpointSelector ResolveSelector(DynamicControllerEndpointSelector currentSelector, Endpoint endpoint)
        {
            var selector = _selectorCache.GetEndpointSelector(endpoint);

            Debug.Assert(currentSelector == null || ReferenceEquals(currentSelector, selector));

            return(selector);
        }
        public DynamicControllerEndpointMatcherPolicy(DynamicControllerEndpointSelector selector)
        {
            if (selector == null)
            {
                throw new ArgumentNullException(nameof(selector));
            }

            _selector = selector;
        }
        public DynamicControllerEndpointMatcherPolicy(DynamicControllerEndpointSelector selector, EndpointMetadataComparer comparer)
        {
            if (selector == null)
            {
                throw new ArgumentNullException(nameof(selector));
            }

            if (comparer == null)
            {
                throw new ArgumentNullException(nameof(comparer));
            }

            _selector = selector;
            _comparer = comparer;
        }
Esempio n. 4
0
        public async Task ApplyAsync(HttpContext httpContext, CandidateSet candidates)
        {
            if (httpContext == null)
            {
                throw new ArgumentNullException(nameof(httpContext));
            }

            if (candidates == null)
            {
                throw new ArgumentNullException(nameof(candidates));
            }

            // The per-route selector, must be the same for all the endpoints we are dealing with.
            DynamicControllerEndpointSelector selector = null;

            // There's no real benefit here from trying to avoid the async state machine.
            // We only execute on nodes that contain a dynamic policy, and thus always have
            // to await something.
            for (var i = 0; i < candidates.Count; i++)
            {
                if (!candidates.IsValidCandidate(i))
                {
                    continue;
                }

                var endpoint       = candidates[i].Endpoint;
                var originalValues = candidates[i].Values;

                RouteValueDictionary dynamicValues = null;

                // We don't expect both of these to be provided, and they are internal so there's
                // no realistic way this could happen.
                var dynamicControllerMetadata = endpoint.Metadata.GetMetadata <DynamicControllerMetadata>();
                var transformerMetadata       = endpoint.Metadata.GetMetadata <DynamicControllerRouteValueTransformerMetadata>();

                DynamicRouteValueTransformer transformer = null;
                if (dynamicControllerMetadata != null)
                {
                    dynamicValues = dynamicControllerMetadata.Values;
                }
                else if (transformerMetadata != null)
                {
                    transformer = (DynamicRouteValueTransformer)httpContext.RequestServices.GetRequiredService(transformerMetadata.SelectorType);
                    if (transformer.State != null)
                    {
                        throw new InvalidOperationException(Resources.FormatStateShouldBeNullForRouteValueTransformers(transformerMetadata.SelectorType.Name));
                    }
                    transformer.State = transformerMetadata.State;

                    dynamicValues = await transformer.TransformAsync(httpContext, originalValues);
                }
                else
                {
                    // Not a dynamic controller.
                    continue;
                }

                if (dynamicValues == null)
                {
                    candidates.ReplaceEndpoint(i, null, null);
                    continue;
                }

                selector = ResolveSelector(selector, endpoint);

                var endpoints = selector.SelectEndpoints(dynamicValues);
                if (endpoints.Count == 0 && dynamicControllerMetadata != null)
                {
                    // Naving no match for a fallback is a configuration error. We can't really check
                    // during startup that the action you configured exists, so this is the best we can do.
                    throw new InvalidOperationException(
                              "Cannot find the fallback endpoint specified by route values: " +
                              "{ " + string.Join(", ", dynamicValues.Select(kvp => $"{kvp.Key}: {kvp.Value}")) + " }.");
                }
                else if (endpoints.Count == 0)
                {
                    candidates.ReplaceEndpoint(i, null, null);
                    continue;
                }

                // We need to provide the route values associated with this endpoint, so that features
                // like URL generation work.
                var values = new RouteValueDictionary(dynamicValues);

                // Include values that were matched by the fallback route.
                if (originalValues != null)
                {
                    foreach (var kvp in originalValues)
                    {
                        values.TryAdd(kvp.Key, kvp.Value);
                    }
                }

                if (transformer != null)
                {
                    endpoints = await transformer.FilterAsync(httpContext, values, endpoints);

                    if (endpoints.Count == 0)
                    {
                        candidates.ReplaceEndpoint(i, null, null);
                        continue;
                    }
                }

                // Update the route values
                candidates.ReplaceEndpoint(i, endpoint, values);

                // Expand the list of endpoints
                candidates.ExpandEndpoint(i, endpoints, _comparer);
            }
        }