feat(AWS Elastic Load Balancer Node): add Elastic Load Balancer node (#4264)

* ✨ AWS Elastic Load Balancer

* Added codex file for ELB

* ⚡ Add paired items

Co-authored-by: Jonathan Bennetts <jonathan.bennetts@gmail.com>

packages/nodes-base/nodes/Aws/ELB/GenericFunctions.ts

@@ -0,0 +1,95 @@
+import {
+	get,
+} from 'lodash';
+
+import {
+	parseString,
+} from 'xml2js';
+
+import {
+	IExecuteFunctions,
+	IHookFunctions,
+	ILoadOptionsFunctions,
+	IWebhookFunctions,
+} from 'n8n-core';
+
+import {
+	IDataObject, IHttpRequestOptions, JsonObject, NodeApiError,
+} from 'n8n-workflow';
+
+export async function awsApiRequest(this: IHookFunctions | IExecuteFunctions | ILoadOptionsFunctions | IWebhookFunctions, service: string, method: string, path: string, body?: string | Buffer, query: IDataObject = {}, headers?: object, option: IDataObject = {}, region?: string): Promise<any> { // tslint:disable-line:no-any
+
+	const credentials = await this.getCredentials('aws');
+
+	const requestOptions = {
+		qs: {
+			...query,
+			service,
+			path,
+		},
+		headers,
+		method,
+		url: '',
+		body,
+		region: credentials?.region as string,
+	} as IHttpRequestOptions;
+
+	try {
+		return await this.helpers.requestWithAuthentication.call(this, 'aws', requestOptions);
+	} catch (error) {
+		throw new NodeApiError(this.getNode(), error as JsonObject);
+	}
+}
+
+export async function awsApiRequestREST(this: IHookFunctions | IExecuteFunctions | ILoadOptionsFunctions, service: string, method: string, path: string, body?: string, query: IDataObject = {}, headers?: object, options: IDataObject = {}, region?: string): Promise<any> { // tslint:disable-line:no-any
+	const response = await awsApiRequest.call(this, service, method, path, body, query, headers, options, region);
+	try {
+		return JSON.parse(response);
+	} catch (e) {
+		return response;
+	}
+}
+
+export async function awsApiRequestSOAP(this: IHookFunctions | IExecuteFunctions | ILoadOptionsFunctions | IWebhookFunctions, service: string, method: string, path: string, body?: string | Buffer, query: IDataObject = {}, headers?: object, option: IDataObject = {}, region?: string): Promise<any> { // tslint:disable-line:no-any
+	const response = await awsApiRequest.call(this, service, method, path, body, query, headers, option, region);
+	try {
+		return await new Promise((resolve, reject) => {
+			parseString(response, { explicitArray: false }, (err, data) => {
+				if (err) {
+					return reject(err);
+				}
+				resolve(data);
+			});
+		});
+	} catch (e) {
+		return e;
+	}
+}
+
+export async function awsApiRequestSOAPAllItems(this: IHookFunctions | IExecuteFunctions | ILoadOptionsFunctions | IWebhookFunctions, propertyName: string, service: string, method: string, path: string, body?: string, query: IDataObject = {}, headers: IDataObject = {}, option: IDataObject = {}, region?: string): Promise<any> { // tslint:disable-line:no-any
+
+	const returnData: IDataObject[] = [];
+
+	let responseData;
+
+	const propertyNameArray = propertyName.split('.');
+
+	do {
+		responseData = await awsApiRequestSOAP.call(this, service, method, path, body, query, headers, option, region);
+
+		if (get(responseData, `${propertyNameArray[0]}.${propertyNameArray[1]}.NextMarker`)) {
+			query['Marker'] = get(responseData, `${propertyNameArray[0]}.${propertyNameArray[1]}.NextMarker`);
+		}
+		if (get(responseData, propertyName)) {
+			if (Array.isArray(get(responseData, propertyName))) {
+				returnData.push.apply(returnData, get(responseData, propertyName));
+			} else {
+				returnData.push(get(responseData, propertyName));
+			}
+		}
+	} while (
+		get(responseData, `${propertyNameArray[0]}.${propertyNameArray[1]}.NextMarker`) !== undefined
+	);
+
+	return returnData;
+}