feat(Linear Node): Add support for OAuth2 (#7201)

packages/nodes-base/credentials/LinearOAuth2Api.credentials.ts

@@ -0,0 +1,73 @@
+import type { ICredentialType, INodeProperties } from 'n8n-workflow';
+
+const scopes = ['read', 'write', 'issues:create', 'comments:create'];
+
+export class LinearOAuth2Api implements ICredentialType {
+	name = 'linearOAuth2Api';
+
+	extends = ['oAuth2Api'];
+
+	displayName = 'Linear OAuth2 API';
+
+	documentationUrl = 'linear';
+
+	properties: INodeProperties[] = [
+		{
+			displayName: 'Grant Type',
+			name: 'grantType',
+			type: 'hidden',
+			default: 'authorizationCode',
+		},
+		{
+			displayName: 'Authorization URL',
+			name: 'authUrl',
+			type: 'hidden',
+			default: 'https://linear.app/oauth/authorize',
+			required: true,
+		},
+		{
+			displayName: 'Access Token URL',
+			name: 'accessTokenUrl',
+			type: 'hidden',
+			default: 'https://api.linear.app/oauth/token',
+			required: true,
+		},
+		{
+			displayName: 'Actor',
+			name: 'actor',
+			type: 'options',
+			options: [
+				{
+					name: 'User',
+					value: 'user',
+					description: 'Resources are created as the user who authorized the application',
+				},
+				{
+					name: 'Application',
+					value: 'application',
+					description: 'Resources are created as the application',
+				},
+			],
+			default: 'user',
+		},
+		{
+			displayName: 'Scope',
+			name: 'scope',
+			type: 'hidden',
+			default: scopes.join(' '),
+			required: true,
+		},
+		{
+			displayName: 'Auth URI Query Parameters',
+			name: 'authQueryParameters',
+			type: 'hidden',
+			default: '={{"actor="+$self["actor"]}}',
+		},
+		{
+			displayName: 'Authentication',
+			name: 'authentication',
+			type: 'hidden',
+			default: 'body',
+		},
+	];
+}

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

@@ -23,6 +23,7 @@ export async function linearApiRequest(
 	option: IDataObject = {},
 ): Promise<any> {
 	const endpoint = 'https://api.linear.app/graphql';
+	const authenticationMethod = this.getNodeParameter('authentication', 0, 'apiToken') as string;
 
 	let options: OptionsWithUri = {
 		headers: {
@@ -35,7 +36,11 @@ export async function linearApiRequest(
 	};
 	options = Object.assign({}, options, option);
 	try {
-		return await this.helpers.requestWithAuthentication.call(this, 'linearApi', options);
+		return await this.helpers.requestWithAuthentication.call(
+			this,
+			authenticationMethod === 'apiToken' ? 'linearApi' : 'linearOAuth2Api',
+			options,
+		);
 	} catch (error) {
 		throw new NodeApiError(this.getNode(), error as JsonObject);
 	}

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

@@ -46,9 +46,39 @@ export class Linear implements INodeType {
 				name: 'linearApi',
 				required: true,
 				testedBy: 'linearApiTest',
+				displayOptions: {
+					show: {
+						authentication: ['apiToken'],
+					},
+				},
+			},
+			{
+				name: 'linearOAuth2Api',
+				required: true,
+				displayOptions: {
+					show: {
+						authentication: ['oAuth2'],
+					},
+				},
 			},
 		],
 		properties: [
+			{
+				displayName: 'Authentication',
+				name: 'authentication',
+				type: 'options',
+				options: [
+					{
+						name: 'API Token',
+						value: 'apiToken',
+					},
+					{
+						name: 'OAuth2',
+						value: 'oAuth2',
+					},
+				],
+				default: 'apiToken',
+			},
 			{
 				displayName: 'Resource',
 				name: 'resource',

packages/nodes-base/nodes/Linear/LinearTrigger.node.ts

@@ -29,6 +29,20 @@ export class LinearTrigger implements INodeType {
 				name: 'linearApi',
 				required: true,
 				testedBy: 'linearApiTest',
+				displayOptions: {
+					show: {
+						authentication: ['apiToken'],
+					},
+				},
+			},
+			{
+				name: 'linearOAuth2Api',
+				required: true,
+				displayOptions: {
+					show: {
+						authentication: ['oAuth2'],
+					},
+				},
 			},
 		],
 		webhooks: [
@@ -40,6 +54,22 @@ export class LinearTrigger implements INodeType {
 			},
 		],
 		properties: [
+			{
+				displayName: 'Authentication',
+				name: 'authentication',
+				type: 'options',
+				options: [
+					{
+						name: 'API Token',
+						value: 'apiToken',
+					},
+					{
+						name: 'OAuth2',
+						value: 'oAuth2',
+					},
+				],
+				default: 'apiToken',
+			},
 			{
 				displayName: 'Team Name or ID',
 				name: 'teamId',

packages/nodes-base/package.json

@@ -188,6 +188,7 @@
       "dist/credentials/Ldap.credentials.js",
       "dist/credentials/LemlistApi.credentials.js",
       "dist/credentials/LinearApi.credentials.js",
+      "dist/credentials/LinearOAuth2Api.credentials.js",
       "dist/credentials/LineNotifyOAuth2Api.credentials.js",
       "dist/credentials/LingvaNexApi.credentials.js",
       "dist/credentials/LinkedInOAuth2Api.credentials.js",