Gitlab OAuth2 support

packages/nodes-base/nodes/Gitlab/GenericFunctions.ts

@@ -6,6 +6,7 @@ import {
 import {
 	IDataObject,
 } from 'n8n-workflow';
+import { OptionsWithUri } from 'request';
 
 /**
  * Make an API request to Gitlab
@@ -17,24 +18,43 @@ import {
  * @returns {Promise<any>}
  */
 export async function gitlabApiRequest(this: IHookFunctions | IExecuteFunctions, method: string, endpoint: string, body: object, query?: object): Promise<any> { // tslint:disable-line:no-any
-	const credentials = this.getCredentials('gitlabApi');
-	if (credentials === undefined) {
-		throw new Error('No credentials got returned!');
-	}
-
-	const options = {
+	const options : OptionsWithUri = {
 		method,
-		headers: {
-			'Private-Token': `${credentials.accessToken}`,
-		},
+		headers: {},
 		body,
 		qs: query,
-		uri: `${(credentials.server as string).replace(/\/$/, '')}/api/v4${endpoint}`,
+		uri: '',
 		json: true
 	};
 
+	if (query === undefined) {
+		delete options.qs;
+	}
+
+	const authenticationMethod = this.getNodeParameter('authentication', 0);
+
 	try {
-		return await this.helpers.request(options);
+		if (authenticationMethod === 'accessToken') {
+			const credentials = this.getCredentials('gitlabApi');
+			if (credentials === undefined) {
+				throw new Error('No credentials got returned!');
+			}
+
+			options.headers!['Private-Token'] = `${credentials.accessToken}`;
+
+			options.uri = `${(credentials.server as string).replace(/\/$/, '')}/api/v4${endpoint}`;
+
+			return await this.helpers.request(options);
+		} else {
+			const credentials = this.getCredentials('gitlabOAuth2Api');
+			if (credentials === undefined) {
+				throw new Error('No credentials got returned!');
+			}
+
+			options.uri = `${(credentials.server as string).replace(/\/$/, '')}/api/v4${endpoint}`;
+
+			return await this.helpers.requestOAuth2!.call(this, 'gitlabOAuth2Api', options);
+		}
 	} catch (error) {
 		if (error.statusCode === 401) {
 			// Return a clear error

packages/nodes-base/nodes/Gitlab/Gitlab.node.ts

@@ -33,9 +33,44 @@ export class Gitlab implements INodeType {
 			{
 				name: 'gitlabApi',
 				required: true,
-			}
+				displayOptions: {
+					show: {
+						authentication: [
+							'accessToken',
+						],
+					},
+				},
+			},
+			{
+				name: 'gitlabOAuth2Api',
+				required: true,
+				displayOptions: {
+					show: {
+						authentication: [
+							'oAuth2',
+						],
+					},
+				},
+			},
 		],
 		properties: [
+			{
+				displayName: 'Authentication',
+				name: 'authentication',
+				type: 'options',
+				options: [
+					{
+						name: 'Access Token',
+						value: 'accessToken',
+					},
+					{
+						name: 'OAuth2',
+						value: 'oAuth2',
+					},
+				],
+				default: 'accessToken',
+				description: 'The resource to operate on.',
+			},
 			{
 				displayName: 'Resource',
 				name: 'resource',
@@ -793,10 +828,26 @@ export class Gitlab implements INodeType {
 		const items = this.getInputData();
 		const returnData: IDataObject[] = [];
 
-		const credentials = this.getCredentials('gitlabApi');
+		let credentials;
 
-		if (credentials === undefined) {
-			throw new Error('No credentials got returned!');
+		const authenticationMethod = this.getNodeParameter('authentication', 0);
+
+		try {
+			if (authenticationMethod === 'accessToken') {
+				credentials = this.getCredentials('gitlabApi');
+
+				if (credentials === undefined) {
+					throw new Error('No credentials got returned!');
+				}
+			} else {
+				credentials = this.getCredentials('gitlabOAuth2Api');
+
+				if (credentials === undefined) {
+					throw new Error('No credentials got returned!');
+				}
+			}
+		} catch (error) {
+			throw new Error(error);
 		}
 
 		// Operations which overwrite the returned data

packages/nodes-base/nodes/Gitlab/GitlabTrigger.node.ts

@@ -34,7 +34,25 @@ export class GitlabTrigger implements INodeType {
 			{
 				name: 'gitlabApi',
 				required: true,
-			}
+				displayOptions: {
+					show: {
+						authentication: [
+							'accessToken',
+						],
+					},
+				},
+			},
+			{
+				name: 'gitlabOAuth2Api',
+				required: true,
+				displayOptions: {
+					show: {
+						authentication: [
+							'oAuth2',
+						],
+					},
+				},
+			},
 		],
 		webhooks: [
 			{
@@ -45,6 +63,23 @@ export class GitlabTrigger implements INodeType {
 			},
 		],
 		properties: [
+			{
+				displayName: 'Authentication',
+				name: 'authentication',
+				type: 'options',
+				options: [
+					{
+						name: 'Access Token',
+						value: 'accessToken',
+					},
+					{
+						name: 'OAuth2',
+						value: 'oAuth2',
+					},
+				],
+				default: 'accessToken',
+				description: 'The resource to operate on.',
+			},
 			{
 				displayName: 'Repository Owner',
 				name: 'owner',