Add Discord allowed mentions configuration

app/Http/Requests/UpdateProjectNotificationActionRequest.php

@@ -10,6 +10,11 @@ use Illuminate\Validation\Rule;
 
 class UpdateProjectNotificationActionRequest extends FormRequest
 {
+    /**
+     * @var list<string>
+     */
+    private const array DISCORD_ALLOWED_MENTION_TYPES = ['everyone', 'roles', 'users'];
+
     /**
      * Determine if the user is authorized to make this request.
      */
@@ -29,6 +34,9 @@ class UpdateProjectNotificationActionRequest extends FormRequest
             'name' => ['required', 'string', 'max:255'],
             'event_type' => ['required', 'string', Rule::in($this->eventTypes())],
             'channel' => ['required', 'string', Rule::in($this->channels())],
+            'channel_configuration' => ['nullable', 'array'],
+            'channel_configuration.allowed_mentions' => ['nullable', 'array'],
+            'channel_configuration.allowed_mentions.*' => $this->allowedMentionRules(),
             'enabled' => ['required', 'boolean'],
             'delivery_url' => ['nullable', 'string', 'max:2048', 'url'],
             'message_template' => $this->messageTemplateRules(),
@@ -68,4 +76,16 @@ class UpdateProjectNotificationActionRequest extends FormRequest
 
         return ['nullable', 'string', 'max:2000'];
     }
+
+    /**
+     * @return array<int, ValidationRule|string>
+     */
+    private function allowedMentionRules(): array
+    {
+        return [
+            'nullable',
+            'string',
+            Rule::in(self::DISCORD_ALLOWED_MENTION_TYPES),
+        ];
+    }
 }