Line data    Source code

       1             : #region Copyright
       2             : // // -----------------------------------------------------------------------
       3             : // // <copyright company="Chinchilla Software Limited">
       4             : // //   Copyright Chinchilla Software Limited. All rights reserved.
       5             : // // </copyright>
       6             : // // -----------------------------------------------------------------------
       7             : #endregion
       8             : 
       9             : using System;
      10             : using cdmdotnet.Logging;
      11             : using Cqrs.Authentication;
      12             : using Cqrs.Events;
      13             : using Cqrs.WebApi.SignalR.Hubs;
      14             : 
      15             : namespace Cqrs.WebApi.Events.Handlers
      16             : {
      17             :         /// <summary>
      18             :         /// Proxies <see cref="IEvent{TAuthenticationToken}">events</see> from the event bus to the <see cref="INotificationHub"/>.
      19             :         /// This requires one or more <see cref="IEventHandler"/> implementations in order to be triggered.
      20             :         /// </summary>
      21             :         /// <typeparam name="TAuthenticationToken">The <see cref="Type"/> of the authentication token.</typeparam>
      22             :         public abstract class EventToHubProxy<TAuthenticationToken>
      23           1 :         {
      24             :                 /// <summary>
      25             :                 /// Instantiates a new instance of <see cref="EventToHubProxy{TAuthenticationToken}"/>.
      26             :                 /// </summary>
      27           1 :                 protected EventToHubProxy(ILogger logger, INotificationHub notificationHub, IAuthenticationTokenHelper<TAuthenticationToken> authenticationTokenHelper)
      28             :                 {
      29             :                         Logger = logger;
      30             :                         NotificationHub = notificationHub;
      31             :                         AuthenticationTokenHelper = authenticationTokenHelper;
      32             :                 }
      33             : 
      34             :                 /// <summary>
      35             :                 /// Gets or sets the <see cref="ILogger"/>.
      36             :                 /// </summary>
      37             :                 protected ILogger Logger { get; private set; }
      38             : 
      39             :                 /// <summary>
      40             :                 /// The <see cref="INotificationHub"/> to proxy <see cref="IEvent{TAuthenticationToken}">events</see> to.
      41             :                 /// </summary>
      42             :                 protected INotificationHub NotificationHub { get; private set; }
      43             : 
      44             :                 /// <summary>
      45             :                 /// Gets or sets the <see cref="IAuthenticationTokenHelper{TAuthenticationToken}"/>.
      46             :                 /// </summary>
      47             :                 protected IAuthenticationTokenHelper<TAuthenticationToken> AuthenticationTokenHelper { get; private set; }
      48             : 
      49             :                 /// <summary>
      50             :                 /// Get the authentication token of the entity that triggered the request generating the provided <paramref name="message"/>
      51             :                 /// Extract any proxy information attributes (<see cref="NotifyCallerEventAttribute"/>, <see cref="NotifyEveryoneEventAttribute"/> and <see cref="NotifyEveryoneExceptCallerEventAttribute"/>)
      52             :                 /// then proxy the provided <paramref name="message"/> to <see cref="NotificationHub"/> if an attribute is present.
      53             :                 /// </summary>
      54             :                 /// <param name="message">The <see cref="IEvent{TAuthenticationToken}"/> to proxy.</param>
      55           1 :                 protected virtual void HandleGenericEvent(IEvent<TAuthenticationToken> message)
      56             :                 {
      57             :                         Type eventType = message.GetType();
      58             :                         var notifyCallerEventAttribute = Attribute.GetCustomAttribute(eventType, typeof(NotifyCallerEventAttribute)) as NotifyCallerEventAttribute;
      59             :                         var notifyEveryoneEventAttribute = Attribute.GetCustomAttribute(eventType, typeof(NotifyEveryoneEventAttribute)) as NotifyEveryoneEventAttribute;
      60             :                         var notifyEveryoneExceptCallerEventAttribute = Attribute.GetCustomAttribute(eventType, typeof(NotifyEveryoneExceptCallerEventAttribute)) as NotifyEveryoneExceptCallerEventAttribute;
      61             : 
      62             :                         string userToken = ((object)AuthenticationTokenHelper.GetAuthenticationToken() ?? string.Empty).ToString().Replace(".", string.Empty);
      63             : 
      64             :                         if (notifyCallerEventAttribute != null)
      65             :                         {
      66             :                                 NotificationHub.SendUserEvent(message, userToken);
      67             :                         }
      68             :                         if (notifyEveryoneEventAttribute != null)
      69             :                         {
      70             :                                 NotificationHub.SendAllUsersEvent(message);
      71             :                         }
      72             :                         if (notifyEveryoneExceptCallerEventAttribute != null)
      73             :                         {
      74             :                                 NotificationHub.SendExceptThisUserEvent(message, userToken);
      75             :                         }
      76             :                 }
      77             :         }
      78             : }