✨ Add SendGrid node (#1321)

* ✨Add SendGrid node

* 👕Fix lint issue

* ⚡ Improvements

* ⚡ Improvements

* ⚡ Improvements

* ⚡ Fix SendGrid-Node

Co-authored-by: ricardo <ricardoespinoza105@gmail.com>
Co-authored-by: Jan Oberhauser <jan.oberhauser@gmail.com>

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

@@ -0,0 +1,74 @@
+import {
+	OptionsWithUri,
+} from 'request';
+
+import {
+	IExecuteFunctions,
+	IExecuteSingleFunctions,
+	IHookFunctions,
+	ILoadOptionsFunctions,
+} from 'n8n-core';
+
+import {
+	IDataObject,
+} from 'n8n-workflow';
+
+export async function sendGridApiRequest(this: IHookFunctions | IExecuteFunctions | IExecuteSingleFunctions | ILoadOptionsFunctions, endpoint: string, method: string, body: any = {}, qs: IDataObject = {}, uri?: string | undefined): Promise<any> { // tslint:disable-line:no-any
+	const credentials = this.getCredentials('sendGridApi') as IDataObject;
+
+	const host = 'api.sendgrid.com/v3';
+
+	const options: OptionsWithUri = {
+		headers: {
+			Authorization: `Bearer ${credentials.apiKey}`,
+		},
+		method,
+		qs,
+		body,
+		uri: uri || `https://${host}${endpoint}`,
+		json: true,
+	};
+
+	if (Object.keys(body).length === 0) {
+		delete options.body;
+	}
+
+	try {
+		//@ts-ignore
+		return await this.helpers.request!(options);
+	} catch (error) {
+		if (error.response && error.response.body && error.response.body.errors) {
+
+			let errors = error.response.body.errors;
+
+			errors = errors.map((e: IDataObject) => e.message);
+			// Try to return the error prettier
+			throw new Error(
+				`SendGrid error response [${error.statusCode}]: ${errors.join('|')}`,
+			);
+		}
+		throw error;
+	}
+}
+
+export async function sendGridApiRequestAllItems(this: IExecuteFunctions | ILoadOptionsFunctions, endpoint: string, method: string, propertyName: string, body: any = {}, query: IDataObject = {}): Promise<any> { // tslint:disable-line:no-any
+
+	const returnData: IDataObject[] = [];
+
+	let responseData;
+
+	let uri;
+
+	do {
+		responseData = await sendGridApiRequest.call(this, endpoint, method, body, query, uri);
+		uri = responseData._metadata.next;
+		returnData.push.apply(returnData, responseData[propertyName]);
+		if (query.limit && returnData.length >= query.limit) {
+			return returnData;
+		}
+	} while (
+		responseData._metadata.next !== undefined
+	);
+
+	return returnData;
+}