✨ Add Mailcheck Node (#1690)

* Add Mailcheck integration

* compress logo

* Add mailcheck node info

* ⚡ Improvements

Co-authored-by: bugagashenkj <bugagashenkj@gmail.com>
Co-authored-by: Nosov Konstantin <nosov@nodeart.io>

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

@@ -0,0 +1,47 @@
+import {
+	OptionsWithUri,
+} from 'request';
+
+import {
+	IExecuteFunctions,
+	IHookFunctions,
+	ILoadOptionsFunctions,
+	IWebhookFunctions,
+} from 'n8n-core';
+
+import {
+	IDataObject
+} from 'n8n-workflow';
+
+export async function mailCheckApiRequest(this: IWebhookFunctions | IHookFunctions | IExecuteFunctions | ILoadOptionsFunctions, method: string, resource: string, body: any = {}, qs: IDataObject = {}, uri?: string, headers: IDataObject = {}, option: IDataObject = {}): Promise<any> { // tslint:disable-line:no-any
+	const credentials = this.getCredentials('mailcheckApi') as IDataObject;
+
+	let options: OptionsWithUri = {
+		headers: {
+			'Content-Type': 'application/json',
+			'Authorization': `Bearer ${credentials.apiKey}`,
+		},
+		method,
+		body,
+		qs,
+		uri: uri || `https://api.mailcheck.co/v1${resource}`,
+		json: true,
+	};
+	try {
+		options = Object.assign({}, options, option);
+		if (Object.keys(headers).length !== 0) {
+			options.headers = Object.assign({}, options.headers, headers);
+		}
+		if (Object.keys(body).length === 0) {
+			delete options.body;
+		}
+		//@ts-ignore
+		return await this.helpers.request.call(this, options);
+	} catch (error) {
+		if (error.response && error.response.body && error.response.body.message) {
+			// Try to return the error prettier
+			throw new Error(`Mailcheck error response [${error.statusCode}]: ${error.response.body.message}`);
+		}
+		throw error;
+	}
+}