Implement Discord webhook delivery

app/Actions/Notifications/DeliverNotificationAction.php

@@ -19,6 +19,8 @@ class DeliverNotificationAction implements ShouldQueue
 {
     use Queueable;
 
+    private const int DISCORD_CONTENT_LIMIT = 2000;
+
     public int $tries = 3;
 
     public int $timeout = 15;
@@ -45,22 +47,38 @@ class DeliverNotificationAction implements ShouldQueue
             return;
         }
 
-        if ($notificationAction->channel !== NotificationChannel::Webhook) {
+        if (! in_array($notificationAction->channel, [NotificationChannel::Discord, NotificationChannel::Webhook], true)) {
             return;
         }
 
         $deliveryLog = $this->resolveDeliveryLog($notificationAction);
         $attemptCount = $this->attempts();
         $attemptedAt = CarbonImmutable::now();
+        $discordMessage = null;
+
+        if ($notificationAction->channel === NotificationChannel::Discord) {
+            $discordMessage = app(RenderDiscordMessageTemplate::class)->handle(
+                $notificationAction->message_template,
+                $this->payload,
+            );
+
+            $validationError = $this->discordMessageValidationError($discordMessage);
+
+            if ($validationError !== null) {
+                $this->markFailedWithoutResponse($deliveryLog, $attemptCount, $attemptedAt, $validationError);
+                $this->fail(new \RuntimeException($validationError));
+
+                return;
+            }
+        }
 
         try {
-            $response = Http::acceptJson()
-                ->asJson()
-                ->connectTimeout(5)
-                ->timeout(10)
-                ->post($notificationAction->delivery_url, $this->payload->toArray());
+            $response = match ($notificationAction->channel) {
+                NotificationChannel::Discord => $this->sendDiscordRequest($notificationAction, $discordMessage ?? ''),
+                NotificationChannel::Webhook => $this->sendWebhookRequest($notificationAction),
+            };
         } catch (ConnectionException $exception) {
-            $this->handleConnectionFailure($deliveryLog, $attemptCount, $attemptedAt, $exception);
+            $this->handleConnectionFailure($deliveryLog, $notificationAction->channel, $attemptCount, $attemptedAt, $exception);
 
             return;
         }
@@ -72,14 +90,14 @@ class DeliverNotificationAction implements ShouldQueue
         }
 
         if ($this->shouldRetry($response) && $this->hasAttemptsRemaining($attemptCount)) {
-            $this->markRetryable($deliveryLog, $response, $attemptCount, $attemptedAt);
+            $this->markRetryable($deliveryLog, $notificationAction->channel, $response, $attemptCount, $attemptedAt);
             $this->release($this->backoffDelay($attemptCount));
 
             return;
         }
 
-        $this->markFailed($deliveryLog, $response, $attemptCount, $attemptedAt);
-        $this->fail(new \RuntimeException($this->responseFailureDescription($response)));
+        $this->markFailed($deliveryLog, $notificationAction->channel, $response, $attemptCount, $attemptedAt);
+        $this->fail(new \RuntimeException($this->responseFailureDescription($notificationAction->channel, $response)));
     }
 
     public function failed(?Throwable $exception): void
@@ -101,11 +119,12 @@ class DeliverNotificationAction implements ShouldQueue
 
     private function handleConnectionFailure(
         NotificationDeliveryLog $deliveryLog,
+        NotificationChannel $channel,
         int $attemptCount,
         CarbonImmutable $attemptedAt,
         ConnectionException $exception,
     ): void {
-        $errorExcerpt = $this->excerpt($exception->getMessage()) ?? 'Webhook request failed.';
+        $errorExcerpt = $this->excerpt($exception->getMessage()) ?? $this->requestFailureDescription($channel);
 
         if ($this->hasAttemptsRemaining($attemptCount)) {
             $deliveryLog->update([
@@ -155,6 +174,7 @@ class DeliverNotificationAction implements ShouldQueue
 
     private function markRetryable(
         NotificationDeliveryLog $deliveryLog,
+        NotificationChannel $channel,
         Response $response,
         int $attemptCount,
         CarbonImmutable $attemptedAt,
@@ -163,7 +183,7 @@ class DeliverNotificationAction implements ShouldQueue
             'attempt_count' => $attemptCount,
             'delivery_status' => NotificationDeliveryStatus::Retryable,
             'delivered_at' => null,
-            'error_excerpt' => $this->responseFailureDescription($response),
+            'error_excerpt' => $this->responseFailureDescription($channel, $response),
             'http_status' => $response->status(),
             'last_attempted_at' => $attemptedAt,
             'response_excerpt' => $this->responseExcerpt($response),
@@ -172,6 +192,7 @@ class DeliverNotificationAction implements ShouldQueue
 
     private function markFailed(
         NotificationDeliveryLog $deliveryLog,
+        NotificationChannel $channel,
         Response $response,
         int $attemptCount,
         CarbonImmutable $attemptedAt,
@@ -180,13 +201,30 @@ class DeliverNotificationAction implements ShouldQueue
             'attempt_count' => $attemptCount,
             'delivery_status' => NotificationDeliveryStatus::Failed,
             'delivered_at' => null,
-            'error_excerpt' => $this->responseFailureDescription($response),
+            'error_excerpt' => $this->responseFailureDescription($channel, $response),
             'http_status' => $response->status(),
             'last_attempted_at' => $attemptedAt,
             'response_excerpt' => $this->responseExcerpt($response),
         ]);
     }
 
+    private function markFailedWithoutResponse(
+        NotificationDeliveryLog $deliveryLog,
+        int $attemptCount,
+        CarbonImmutable $attemptedAt,
+        string $errorExcerpt,
+    ): void {
+        $deliveryLog->update([
+            'attempt_count' => $attemptCount,
+            'delivery_status' => NotificationDeliveryStatus::Failed,
+            'delivered_at' => null,
+            'error_excerpt' => $errorExcerpt,
+            'http_status' => null,
+            'last_attempted_at' => $attemptedAt,
+            'response_excerpt' => null,
+        ]);
+    }
+
     private function resolveDeliveryLog(NotificationAction $notificationAction): NotificationDeliveryLog
     {
         $deliveryLog = $this->loadDeliveryLog();
@@ -226,6 +264,26 @@ class DeliverNotificationAction implements ShouldQueue
         return $response->serverError() || in_array($response->status(), [408, 429], true);
     }
 
+    private function sendDiscordRequest(NotificationAction $notificationAction, string $message): Response
+    {
+        return Http::acceptJson()
+            ->asJson()
+            ->connectTimeout(5)
+            ->timeout(10)
+            ->post($notificationAction->delivery_url, [
+                'content' => $message,
+            ]);
+    }
+
+    private function sendWebhookRequest(NotificationAction $notificationAction): Response
+    {
+        return Http::acceptJson()
+            ->asJson()
+            ->connectTimeout(5)
+            ->timeout(10)
+            ->post($notificationAction->delivery_url, $this->payload->toArray());
+    }
+
     private function hasAttemptsRemaining(int $attemptCount): bool
     {
         return $attemptCount < $this->tries;
@@ -244,15 +302,45 @@ class DeliverNotificationAction implements ShouldQueue
         return $this->excerpt($response->body()) ?? $this->excerpt($response->reason());
     }
 
-    private function responseFailureDescription(Response $response): string
+    private function responseFailureDescription(NotificationChannel $channel, Response $response): string
     {
         $reason = $this->excerpt($response->reason());
+        $subject = $this->deliverySubject($channel);
 
         if ($reason === null) {
-            return "Webhook returned HTTP {$response->status()}.";
+            return "{$subject} returned HTTP {$response->status()}.";
         }
 
-        return "Webhook returned HTTP {$response->status()} {$reason}.";
+        return "{$subject} returned HTTP {$response->status()} {$reason}.";
+    }
+
+    private function requestFailureDescription(NotificationChannel $channel): string
+    {
+        return match ($channel) {
+            NotificationChannel::Discord => 'Discord webhook request failed.',
+            NotificationChannel::Webhook => 'Webhook request failed.',
+        };
+    }
+
+    private function deliverySubject(NotificationChannel $channel): string
+    {
+        return match ($channel) {
+            NotificationChannel::Discord => 'Discord webhook',
+            NotificationChannel::Webhook => 'Webhook',
+        };
+    }
+
+    private function discordMessageValidationError(string $message): ?string
+    {
+        if (trim($message) === '') {
+            return 'Discord message content cannot be empty.';
+        }
+
+        if (Str::length($message) > self::DISCORD_CONTENT_LIMIT) {
+            return 'Discord message content exceeds the 2000 character limit.';
+        }
+
+        return null;
     }
 
     /**

app/Actions/Notifications/QueueTicketStatusChangedNotificationDeliveries.php

@@ -19,7 +19,7 @@ class QueueTicketStatusChangedNotificationDeliveries
             ->each(function (NotificationAction $notificationAction) use ($event): void {
                 $notificationDeliveryLogId = null;
 
-                if ($notificationAction->channel === NotificationChannel::Webhook) {
+                if (in_array($notificationAction->channel, [NotificationChannel::Discord, NotificationChannel::Webhook], true)) {
                     $notificationDeliveryLogId = NotificationDeliveryLog::query()->create([
                         'attempt_count' => 0,
                         'channel' => $notificationAction->channel,

app/Actions/Notifications/RenderDiscordMessageTemplate.php

@@ -0,0 +1,21 @@
+<?php
+
+namespace App\Actions\Notifications;
+
+use Illuminate\Support\Str;
+
+class RenderDiscordMessageTemplate
+{
+    public function handle(?string $messageTemplate, TicketStatusChangedPayload $payload): string
+    {
+        return strtr((string) Str::of((string) $messageTemplate), [
+            '$url' => $payload->ticketUrl,
+            '$ticket_key' => $payload->ticketKey,
+            '$ticket_title' => $payload->ticketTitle,
+            '$project_name' => $payload->projectName,
+            '$status_from' => $payload->fromStatusLabel,
+            '$status_to' => $payload->toStatusLabel,
+            '$actor_name' => $payload->actorName ?? '',
+        ]);
+    }
+}