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/*
* Copyright (c) 2024 Vaughn Nugent
*
* Library: VNLib
* Package: VNLib.Plugins.Extensions.Loading
* File: MiddlewareHelpers.cs
*
* MiddlewareHelpers.cs is part of VNLib.Plugins.Extensions.Loading which is part of the larger
* VNLib collection of libraries and utilities.
*
* VNLib.Plugins.Extensions.Loading is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* VNLib.Plugins.Extensions.Loading is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see https://www.gnu.org/licenses/.
*/
using System.Collections.Generic;
using System.Runtime.CompilerServices;
using VNLib.Utils.Extensions;
using VNLib.Plugins.Essentials.Middleware;
namespace VNLib.Plugins.Extensions.Loading.Routing
{
/// <summary>
/// Provides helper extensions for http middleware
/// </summary>
public static class MiddlewareHelpers
{
private static readonly ConditionalWeakTable<PluginBase, List<IHttpMiddleware>> _pluginMiddlewareList = new();
/// <summary>
/// Exports a single middlware instance to the collection for the plugin.
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="plugin"></param>
/// <param name="instances">A params array of middleware instances to export to the plugin</param>
/// <remarks>
/// WARNING: Adding middleware arrays explicitly to the plugin service pool will override
/// this function. All instances must be exposed though this function
/// </remarks>
public static void ExportMiddleware<T>(this PluginBase plugin, params T[] instances) where T : IHttpMiddleware
{
/*
* The runtime accepts an enumeration of IHttpMiddleware instances, so
* a list can just be exported as an enumerable instance
*/
static List<IHttpMiddleware> OnCreate(PluginBase plugin)
{
List<IHttpMiddleware> collection = new(1);
plugin.ExportService<IEnumerable<IHttpMiddleware>>(collection);
return collection;
}
//Get the endpoint collection for the current plugin
List<IHttpMiddleware> middlewares = _pluginMiddlewareList.GetValue(plugin, OnCreate);
//Add the endpoint to the collection
instances.ForEach(mw => middlewares.Add(mw));
}
}
}
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