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

import { IExecuteFunctions } from 'n8n-core';

import {
	IDataObject,
	INodeExecutionData,
	INodeType,
	INodeTypeDescription,
	NodeOperationError,
} from 'n8n-workflow';

import {
	endOfDayDataFields,
	endOfDayDataOperations,
	exchangeFields,
	exchangeOperations,
	tickerFields,
	tickerOperations,
} from './descriptions';

import {
	format,
	marketstackApiRequest,
	marketstackApiRequestAllItems,
	validateTimeOptions,
} from './GenericFunctions';

import { EndOfDayDataFilters, Operation, Resource } from './types';

export class Marketstack implements INodeType {
	description: INodeTypeDescription = {
		displayName: 'Marketstack',
		name: 'marketstack',
		subtitle: '={{$parameter["operation"] + ": " + $parameter["resource"]}}',
		icon: 'file:marketstack.svg',
		group: ['transform'],
		version: 1,
		description: 'Consume Marketstack API',
		defaults: {
			name: 'Marketstack',
		},
		inputs: ['main'],
		outputs: ['main'],
		credentials: [
			{
				name: 'marketstackApi',
				required: true,
			},
		],
		properties: [
			{
				displayName: 'Resource',
				name: 'resource',
				type: 'options',
				noDataExpression: true,
				options: [
					{
						name: 'End-of-Day Data',
						value: 'endOfDayData',
						description: 'Stock market closing data',
					},
					{
						name: 'Exchange',
						value: 'exchange',
						description: 'Stock market exchange',
					},
					{
						name: 'Ticker',
						value: 'ticker',
						description: 'Stock market symbol',
					},
				],
				default: 'endOfDayData',
				required: true,
			},
			...endOfDayDataOperations,
			...endOfDayDataFields,
			...exchangeOperations,
			...exchangeFields,
			...tickerOperations,
			...tickerFields,
		],
	};

	async execute(this: IExecuteFunctions): Promise<INodeExecutionData[][]> {
		const items = this.getInputData();

		const resource = this.getNodeParameter('resource', 0) as Resource;
		const operation = this.getNodeParameter('operation', 0) as Operation;

		let responseData: any;
		const returnData: INodeExecutionData[] = [];

		for (let i = 0; i < items.length; i++) {
			try {
				if (resource === 'endOfDayData') {
					if (operation === 'getAll') {
						// ----------------------------------
						//       endOfDayData: getAll
						// ----------------------------------

						const qs: IDataObject = {
							symbols: this.getNodeParameter('symbols', i),
						};

						const { latest, specificDate, dateFrom, dateTo, ...rest } = this.getNodeParameter(
							'filters',
							i,
						) as EndOfDayDataFilters;

						validateTimeOptions.call(this, [
							latest !== undefined && latest,
							specificDate !== undefined,
							dateFrom !== undefined && dateTo !== undefined,
						]);

						if (Object.keys(rest).length) {
							Object.assign(qs, rest);
						}

						let endpoint: string;

						if (latest) {
							endpoint = '/eod/latest';
						} else if (specificDate) {
							endpoint = `/eod/${format(specificDate)}`;
						} else {
							if (!dateFrom || !dateTo) {
								throw new NodeOperationError(
									this.getNode(),
									'Please enter a start and end date to filter by timeframe.',
									{ itemIndex: i },
								);
							}
							endpoint = '/eod';
							qs.date_from = format(dateFrom);
							qs.date_to = format(dateTo);
						}

						responseData = await marketstackApiRequestAllItems.call(this, 'GET', endpoint, {}, qs);
					}
				} else if (resource === 'exchange') {
					if (operation === 'get') {
						// ----------------------------------
						//          exchange: get
						// ----------------------------------

						const exchange = this.getNodeParameter('exchange', i);
						const endpoint = `/exchanges/${exchange}`;

						responseData = await marketstackApiRequest.call(this, 'GET', endpoint);
					}
				} else if (resource === 'ticker') {
					if (operation === 'get') {
						// ----------------------------------
						//           ticker: get
						// ----------------------------------

						const symbol = this.getNodeParameter('symbol', i);
						const endpoint = `/tickers/${symbol}`;

						responseData = await marketstackApiRequest.call(this, 'GET', endpoint);
					}
				}
			} catch (error) {
				if (this.continueOnFail()) {
					const executionErrorData = this.helpers.constructExecutionMetaData(
						this.helpers.returnJsonArray({ error: error.message }),
						{ itemData: { item: i } },
					);
					returnData.push(...executionErrorData);
					continue;
				}
				throw error;
			}

			const executionData = this.helpers.constructExecutionMetaData(
				this.helpers.returnJsonArray(responseData),
				{ itemData: { item: i } },
			);

			returnData.push(...executionData);
		}

		return this.prepareOutputData(returnData);
	}
}