✨ Add Marketstack node (#2033)

* Add Marketstack Node

* Add optional HTTPS support

* ⚡ Refactor Marketstack node

* 🔥 Remove logging

* ⚡ Small improvement

* 🐛 Fix issue validating error condition

Co-authored-by: Ed Linklater <github@ed.geek.nz>
Co-authored-by: ricardo <ricardoespinoza105@gmail.com>

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

@@ -0,0 +1,96 @@
+import {
+	OptionsWithUri,
+} from 'request';
+
+import {
+	IExecuteFunctions,
+} from 'n8n-core';
+
+import {
+	IDataObject,
+	NodeApiError,
+	NodeOperationError,
+} from 'n8n-workflow';
+
+export async function marketstackApiRequest(
+	this: IExecuteFunctions,
+	method: string,
+	endpoint: string,
+	body: IDataObject = {},
+	qs: IDataObject = {},
+) {
+	const credentials = this.getCredentials('marketstackApi') as IDataObject;
+	const protocol = credentials.useHttps ? 'https' : 'http'; // Free API does not support HTTPS
+
+	const options: OptionsWithUri = {
+		method,
+		uri: `${protocol}://api.marketstack.com/v1${endpoint}`,
+		qs: {
+			access_key: credentials.apiKey,
+			...qs,
+		},
+		json: true,
+	};
+
+	if (!Object.keys(body).length) {
+		delete options.body;
+	}
+
+	try {
+		return await this.helpers.request(options);
+	} catch (error) {
+		throw new NodeApiError(this.getNode(), error);
+	}
+}
+
+export async function marketstackApiRequestAllItems(
+	this: IExecuteFunctions,
+	method: string,
+	endpoint: string,
+	body: IDataObject = {},
+	qs: IDataObject = {},
+) {
+	const returnAll = this.getNodeParameter('returnAll', 0, false) as boolean;
+	const limit = this.getNodeParameter('limit', 0, 0) as number;
+
+	let responseData;
+	const returnData: IDataObject[] = [];
+
+	qs.offset = 0;
+
+	do {
+		responseData = await marketstackApiRequest.call(this, method, endpoint, body, qs);
+		returnData.push(...responseData.data);
+
+		if (!returnAll && returnData.length > limit) {
+			return returnData.slice(0, limit);
+		}
+
+		qs.offset += responseData.count;
+	} while (
+		responseData.total > returnData.length
+	);
+
+	return returnData;
+}
+
+export const format = (datetime?: string) => datetime?.split('T')[0];
+
+export function validateTimeOptions(
+	this: IExecuteFunctions,
+	timeOptions: boolean[],
+) {
+	if (timeOptions.every(o => !o)) {
+		throw new NodeOperationError(
+			this.getNode(),
+			'Please filter by latest, specific date or timeframe (start and end dates).',
+		);
+	}
+
+	if (timeOptions.filter(Boolean).length > 1) {
+		throw new NodeOperationError(
+			this.getNode(),
+			'Please filter by one of latest, specific date, or timeframe (start and end dates).',
+		);
+	}
+}