feat(Discord Node): Add support for OAuth custom scopes (#16708)

Co-authored-by: Elias Meire <elias@meire.dev>

packages/nodes-base/credentials/DiscordOAuth2Api.credentials.ts

@@ -1,5 +1,7 @@
 import type { ICredentialType, INodeProperties } from 'n8n-workflow';
 
+const defaultScopes = ['identify', 'guilds', 'guilds.join', 'bot'];
+
 export class DiscordOAuth2Api implements ICredentialType {
 	name = 'discordOAuth2Api';
 
@@ -39,18 +41,50 @@ export class DiscordOAuth2Api implements ICredentialType {
 			default: 'https://discord.com/api/oauth2/token',
 			required: true,
 		},
-		{
-			displayName: 'Scope',
-			name: 'scope',
-			type: 'hidden',
-			default: 'identify guilds guilds.join bot',
-			required: true,
-		},
 		{
 			displayName: 'Auth URI Query Parameters',
 			name: 'authQueryParameters',
 			type: 'hidden',
 			default: 'permissions=1642758929655',
 		},
+
+		{
+			displayName: 'Custom Scopes',
+			name: 'customScopes',
+			type: 'boolean',
+			default: false,
+			description: 'Define custom scopes',
+		},
+		{
+			displayName:
+				'The default scopes needed for the node to work are already set, If you change these the node may not function correctly.',
+			name: 'customScopesNotice',
+			type: 'notice',
+			default: '',
+			displayOptions: {
+				show: {
+					customScopes: [true],
+				},
+			},
+		},
+		{
+			displayName: 'Enabled Scopes',
+			name: 'enabledScopes',
+			type: 'string',
+			displayOptions: {
+				show: {
+					customScopes: [true],
+				},
+			},
+			default: defaultScopes.join(' '),
+			description: 'Scopes that should be enabled',
+		},
+		{
+			displayName: 'Scope',
+			name: 'scope',
+			type: 'hidden',
+			default:
+				'={{$self["customScopes"] ? $self["enabledScopes"] : "' + defaultScopes.join(' ') + '"}}',
+		},
 	];
 }