79 lines
2.5 KiB
C#
79 lines
2.5 KiB
C#
// Copyright (c) .NET Foundation. All rights reserved.
|
|
// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
|
|
|
|
using System;
|
|
using System.Collections.Generic;
|
|
using System.Threading.Tasks;
|
|
using Microsoft.AspNetCore.Dispatcher;
|
|
|
|
namespace DispatcherSample
|
|
{
|
|
public class HttpMethodEndpointSelector : EndpointSelector
|
|
{
|
|
public override async Task SelectAsync(EndpointSelectorContext context)
|
|
{
|
|
if (context == null)
|
|
{
|
|
throw new ArgumentNullException(nameof(context));
|
|
}
|
|
|
|
var snapshot = context.CreateSnapshot();
|
|
|
|
var fallback = new List<Endpoint>();
|
|
for (var i = context.Endpoints.Count - 1; i >= 0; i--)
|
|
{
|
|
var endpoint = context.Endpoints[i];
|
|
ITemplateEndpoint metadata = null;
|
|
|
|
for (var j = endpoint.Metadata.Count - 1; j >= 0; j--)
|
|
{
|
|
metadata = endpoint.Metadata[j] as ITemplateEndpoint;
|
|
if (metadata != null)
|
|
{
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (metadata == null)
|
|
{
|
|
// No metadata.
|
|
fallback.Add(endpoint);
|
|
context.Endpoints.RemoveAt(i);
|
|
}
|
|
else if (Matches(metadata, context.HttpContext.Request.Method))
|
|
{
|
|
// Do thing, this one matches
|
|
}
|
|
else
|
|
{
|
|
// Not a match.
|
|
context.Endpoints.RemoveAt(i);
|
|
}
|
|
}
|
|
|
|
// Now the list of endpoints only contains those that have an HTTP method preference AND match the current
|
|
// request.
|
|
await context.InvokeNextAsync();
|
|
|
|
if (context.Endpoints.Count == 0)
|
|
{
|
|
// Nothing matched, do the fallback.
|
|
context.RestoreSnapshot(snapshot);
|
|
context.Endpoints.Clear();
|
|
|
|
for (var i = 0; i < fallback.Count; i++)
|
|
{
|
|
context.Endpoints.Add(fallback[i]);
|
|
}
|
|
|
|
await context.InvokeNextAsync();
|
|
}
|
|
}
|
|
|
|
private bool Matches(ITemplateEndpoint endpoint, string httpMethod)
|
|
{
|
|
return string.Equals(endpoint.HttpMethod, httpMethod, StringComparison.OrdinalIgnoreCase);
|
|
}
|
|
}
|
|
}
|