feat: begin working through how we will handle resubscribing and unsubscribing

src/src/StevesBot.Webhook/Program.cs

@@ -1,5 +1,3 @@
-using Microsoft.AspNetCore.Mvc;
-
 var builder = WebApplication.CreateBuilder(args);
 
 builder.Services
@@ -28,25 +26,7 @@ app.UseHttpsRedirection();
 
 const string ytCallback = "yt-callback";
 
-app.MapGet(
-  ytCallback,
-  static (
-    [FromQuery(Name = "hub.mode")] string mode,
-    [FromQuery(Name = "hub.topic")] string topic,
-    [FromQuery(Name = "hub.challenge")] string challenge,
-    [FromServices] IOptions<SubscriptionOptions> subOptions,
-    [FromServices] ILogger<Program> logger
-  ) =>
-  {
-    if (topic != subOptions.Value.TopicUrl)
-    {
-      logger.LogInformation("Received verification request for wrong topic: {Topic}", topic);
-      return Results.NotFound();
-    }
-
-    return Results.Text(challenge);
-  }
-);
+app.MapGet(ytCallback, VerifySubscriptionHandler.HandleAsync);
 
 // TODO: Implement logic to do the following:
 // - extract video id from notification

src/src/StevesBot.Webhook/Usings.cs

@@ -1,6 +1,7 @@
 global using System.ComponentModel.DataAnnotations;
 
+global using Microsoft.AspNetCore.Mvc;
 global using Microsoft.Extensions.Options;
 
 global using StevesBot.Webhook;
-global using StevesBot.Webhook.YouTube;
+global using StevesBot.Webhook.YouTube;

src/src/StevesBot.Webhook/YouTube/IPubSubClient.cs

@@ -2,13 +2,7 @@ namespace StevesBot.Webhook.YouTube;
 
 internal interface IPubSubClient
 {
-  Task SubscribeAsync(
-    string callbackUrl,
-    string topicUrl,
-    CancellationToken cancellationToken = default
-  );
-
-  Task UnsubscribeAsync(
+  Task<bool> SubscribeAsync(
     string callbackUrl,
     string topicUrl,
     CancellationToken cancellationToken = default

src/src/StevesBot.Webhook/YouTube/PubSubClient.cs

@@ -1,12 +1,15 @@
-
 namespace StevesBot.Webhook.YouTube;
 
-internal sealed class PubSubClient(HttpClient httpClient) : IPubSubClient
+internal sealed class PubSubClient(
+  HttpClient httpClient,
+  ILogger<PubSubClient> logger
+) : IPubSubClient
 {
   private const string SubscribeEndpoint = "subscribe";
   private readonly HttpClient _httpClient = httpClient;
+  private readonly ILogger<PubSubClient> _logger = logger;
 
-  public async Task SubscribeAsync(string callbackUrl, string topicUrl, CancellationToken cancellationToken = default)
+  public async Task<bool> SubscribeAsync(string callbackUrl, string topicUrl, CancellationToken cancellationToken = default)
   {
     var uri = new Uri(SubscribeEndpoint, UriKind.Relative);
     var formFields = new Dictionary<string, string>()
@@ -21,12 +24,16 @@ internal sealed class PubSubClient(HttpClient httpClient) : IPubSubClient
 
     if (response.IsSuccessStatusCode is false)
     {
-      throw new PubSubClientException("Failed to subscribe");
-    }
-  }
+      var responseContent = await response.Content.ReadAsStringAsync(cancellationToken);
 
-  public Task UnsubscribeAsync(string callbackUrl, string topicUrl, CancellationToken cancellationToken = default)
-  {
-    throw new NotImplementedException();
+      _logger.LogDebug(
+        "Failed to subscribe to topic {TopicUrl} with callback {CallbackUrl}: {ErrorMessage}",
+        topicUrl,
+        callbackUrl,
+        responseContent
+      );
+    }
+
+    return response.IsSuccessStatusCode;
   }
-}
+}

src/src/StevesBot.Webhook/YouTube/PubSubClientException.cs

@@ -1,16 +0,0 @@
-namespace StevesBot.Webhook.YouTube;
-
-internal sealed class PubSubClientException : Exception
-{
-  public PubSubClientException()
-  {
-  }
-
-  public PubSubClientException(string message) : base(message)
-  {
-  }
-
-  public PubSubClientException(string message, Exception innerException) : base(message, innerException)
-  {
-  }
-}

src/src/StevesBot.Webhook/YouTube/SubscriptionWorker.cs

@@ -1,4 +1,4 @@
-namespace StevesBot.Webhook;
+namespace StevesBot.Webhook.YouTube;
 
 internal sealed class SubscriptionWorker(
   ILogger<SubscriptionWorker> logger,
@@ -24,11 +24,19 @@ internal sealed class SubscriptionWorker(
   {
     _logger.LogInformation("Subscribing to notifications");
 
-    await _pubSubClient.SubscribeAsync(
+    var isSubscribed = await _pubSubClient.SubscribeAsync(
       _options.CallbackUrl,
       _options.TopicUrl,
       cancellationToken
     );
+
+    if (isSubscribed)
+    {
+      _logger.LogInformation("Successfully subscribed to notifications");
+      return;
+    }
+
+    _logger.LogWarning("Failed to subscribe to notifications");
   }
 
 

src/src/StevesBot.Webhook/YouTube/Tasks/SubscribeTask.cs

@@ -0,0 +1,6 @@
+namespace StevesBot.Webhook.YouTube.Tasks;
+
+internal sealed record SubscribeTask : SubscriptionTask
+{
+  public DateTimeOffset ExpiresAt { get; init; }
+}

src/src/StevesBot.Webhook/YouTube/Tasks/SubscriptionTask.cs

@@ -0,0 +1,7 @@
+namespace StevesBot.Webhook.YouTube.Tasks;
+
+internal abstract record SubscriptionTask
+{
+  public string CallbackUrl { get; init; } = string.Empty;
+  public string TopicUrl { get; init; } = string.Empty;
+}

src/src/StevesBot.Webhook/YouTube/Tasks/UnsubscribeTask.cs

@@ -0,0 +1,5 @@
+namespace StevesBot.Webhook.YouTube.Tasks;
+
+internal sealed record UnsubscribeTask : SubscriptionTask
+{
+}

src/src/StevesBot.Webhook/YouTube/VerifySubscriptionHandler.cs

@@ -0,0 +1,55 @@
+namespace StevesBot.Webhook.YouTube;
+
+internal static class VerifySubscriptionHandler
+{
+  public static IResult HandleAsync(
+    [FromQuery(Name = "hub.mode")] string mode,
+    [FromQuery(Name = "hub.topic")] string topic,
+    [FromQuery(Name = "hub.reason")] string? reason,
+    [FromQuery(Name = "hub.challenge")] string? challenge,
+    [FromQuery(Name = "hub.lease_seconds")] string? leaseSeconds,
+    [FromServices] IOptions<SubscriptionOptions> subOptions,
+    [FromServices] ILogger<Program> logger
+  )
+  {
+    if (mode is "denied")
+    {
+      logger.LogInformation("Received subscription denial for topic: {Topic}, reason: {Reason}", topic, reason);
+      return Results.BadRequest("Subscription denied");
+    }
+
+    if (topic != subOptions.Value.TopicUrl)
+    {
+      logger.LogInformation("Received verification request for wrong topic: {Topic}", topic);
+      return Results.NotFound();
+    }
+
+    if (mode is "subscribe")
+    {
+      // TODO: If it is a subscription request
+      // we need to queue up a resubscription
+      // request to be executed just before
+      // the hub.lease expires.
+      logger.LogInformation(
+        "Received subscription request for topic: {Topic}, challenge: {Challenge}, lease: {LeaseSeconds}",
+        topic,
+        challenge,
+        leaseSeconds
+      );
+    }
+
+    if (mode is "unsubscribe")
+    {
+      // TODO: If it is a unsubscription request
+      // we need to queue up an ubsubscription
+      // request to be executed immediately
+      logger.LogInformation(
+        "Received unsubscription request for topic: {Topic}, challenge: {Challenge}",
+        topic,
+        challenge
+      );
+    }
+
+    return Results.Text(challenge);
+  }
+}