n8n/packages/nodes-base/nodes/LinkedIn/LinkedIn.node.ts

import { IExecuteFunctions, BINARY_ENCODING } from 'n8n-core';
import {
	IDataObject,
	INodeTypeDescription,
	INodeExecutionData,
	INodeType,
	ILoadOptionsFunctions,
	INodePropertyOptions,
} from 'n8n-workflow';
import { linkedInApiRequest } from './GenericFunctions';
import { postOperations, postFields } from './PostDescription';

export class LinkedIn implements INodeType {
	description: INodeTypeDescription = {
		displayName: 'LinkedIn',
		name: 'linkedIn',
		icon: 'file:linkedin.png',
		group: ['input'],
		version: 1,
		description: 'Consume LinkedIn Api',
		defaults: {
			name: 'LinkedIn',
			color: '#0075b4',
		},
		inputs: ['main'],
		outputs: ['main'],
		credentials: [
			{
				name: 'linkedInOAuth2Api',
				required: true,
			},
		],
		properties: [
			{
				displayName: 'Resource',
				name: 'resource',
				type: 'options',
				options: [
					{
						name: 'Post',
						value: 'post',
					},
				],
				default: 'post',
				description: 'The resource to consume',
			},
			//POST
			...postOperations,
			...postFields,
		],


	};

	methods = {
		loadOptions: {
			// Get Person URN which has to be used with other LinkedIn API Requests
			// https://docs.microsoft.com/en-us/linkedin/consumer/integrations/self-serve/sign-in-with-linkedin
			async getPersonUrn(this: ILoadOptionsFunctions): Promise<INodePropertyOptions[]> {
				const returnData: INodePropertyOptions[] = [];
				const person = await linkedInApiRequest.call(this, 'GET', '/me', {});
				returnData.push({ name: `${person.localizedFirstName} ${person.localizedLastName}`, value: person.id });
				return returnData;
			},
		}
	};

	async execute(this: IExecuteFunctions): Promise<INodeExecutionData[][]> {
		const items = this.getInputData();
		const returnData: IDataObject[] = [];
		let responseData;
		const resource = this.getNodeParameter('resource', 0) as string;
		const operation = this.getNodeParameter('operation', 0) as string;
		let body = {};

		for (let i = 0; i < items.length; i++) {
			if (resource === 'post') {
				if (operation === 'create') {
					const text = this.getNodeParameter('text', i) as string;
					const shareMediaCategory = this.getNodeParameter('shareMediaCategory', i) as string;
					const postAs = this.getNodeParameter('postAs', i) as string;
					const additionalFields = this.getNodeParameter('additionalFields', i) as IDataObject;

					let authorUrn = '';
					let visibility = 'PUBLIC';

					if (postAs === 'person') {
						const personUrn = this.getNodeParameter('person', i) as string;
						// Only if posting as a person can user decide if post visible by public or connections
						visibility = additionalFields.visibility as string || 'PUBLIC';
						authorUrn = `urn:li:person:${personUrn}`;
					} else {
						const organizationUrn = this.getNodeParameter('organization', i) as string;
						authorUrn = `urn:li:organization:${organizationUrn}`;
					}

					let description = '';
					let title = '';
					let originalUrl = '';

					if (shareMediaCategory === 'IMAGE') {

						if (additionalFields.description) {
							description = additionalFields.description as string;
						}
						if (additionalFields.title) {
							title = additionalFields.title as string;
						}
						// Send a REQUEST to prepare a register of a media image file
						const registerRequest = {
							registerUploadRequest: {
								recipes: [
									'urn:li:digitalmediaRecipe:feedshare-image',
								],
								owner: authorUrn,
								serviceRelationships: [
									{
										relationshipType: 'OWNER',
										identifier: 'urn:li:userGeneratedContent',
									},
								],
							},
						};

						const registerObject = await linkedInApiRequest.call(this, 'POST', '/assets?action=registerUpload', registerRequest);

						// Response provides a specific upload URL that is used to upload the binary image file
						const uploadUrl = registerObject.value.uploadMechanism['com.linkedin.digitalmedia.uploading.MediaUploadHttpRequest'].uploadUrl as string;
						const asset = registerObject.value.asset as string;

						// Prepare binary file upload
						const item = items[i];

						if (item.binary === undefined) {
							throw new Error('No binary data exists on item!');
						}

						const propertyNameUpload = this.getNodeParameter('binaryPropertyName', i) as string;

						if (item.binary[propertyNameUpload] === undefined) {
							throw new Error(`No binary data property "${propertyNameUpload}" does not exists on item!`);
						}

						// Buffer binary data
						const buffer = Buffer.from(item.binary[propertyNameUpload].data, BINARY_ENCODING) as Buffer;
						// Upload image
						await linkedInApiRequest.call(this, 'POST', uploadUrl, buffer, true);

						body = {
							author: authorUrn,
							lifecycleState: 'PUBLISHED',
							specificContent: {
								'com.linkedin.ugc.ShareContent': {
									shareCommentary: {
										text,
									},
									shareMediaCategory: 'IMAGE',
									media: [
										{
											status: 'READY',
											description: {
												text: description,
											},
											media: asset,
											title: {
												text: title,
											},
										},
									],
								},
							},
							visibility: {
								'com.linkedin.ugc.MemberNetworkVisibility': visibility,
							},
						};

					} else if (shareMediaCategory === 'ARTICLE') {
						const additionalFields = this.getNodeParameter('additionalFields', i) as IDataObject;

						if (additionalFields.description) {
							description = additionalFields.description as string;
						}
						if (additionalFields.title) {
							title = additionalFields.title as string;
						}
						if (additionalFields.originalUrl) {
							originalUrl = additionalFields.originalUrl as string;
						}

						body = {
							author: `${authorUrn}`,
							lifecycleState: 'PUBLISHED',
							specificContent: {
								'com.linkedin.ugc.ShareContent': {
									shareCommentary: {
										text,
									},
									shareMediaCategory,
									media: [
										{
											status: 'READY',
											description: {
												text: description
											},
											originalUrl,
											title: {
												text: title
											}
										}
									]
								}
							},
							visibility: {
								'com.linkedin.ugc.MemberNetworkVisibility': visibility
							}
						};
					} else {
						body = {
							author: authorUrn,
							lifecycleState: 'PUBLISHED',
							specificContent: {
								'com.linkedin.ugc.ShareContent': {
									shareCommentary: {
										text,
									},
									shareMediaCategory,
								},
							},
							visibility: {
								'com.linkedin.ugc.MemberNetworkVisibility': visibility
							}
						};
					}

					const endpoint = '/ugcPosts';
					responseData = await linkedInApiRequest.call(this, 'POST', endpoint, body);
				}
			}

			if (Array.isArray(responseData)) {
				returnData.push.apply(returnData, responseData as IDataObject[]);
			} else {
				returnData.push(responseData as IDataObject);
			}
		}

		return [this.helpers.returnJsonArray(returnData)];
	}
}