✨ Add Demio node (#1434)

* ✨ Add Demio node

* ⚡ Improvements

* ⚡ Minor improvement on Demio-Node

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

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

@@ -0,0 +1,48 @@
+import {
+	OptionsWithUri,
+} from 'request';
+
+import {
+	IExecuteFunctions,
+	IExecuteSingleFunctions,
+	IHookFunctions,
+	ILoadOptionsFunctions,
+} from 'n8n-core';
+
+import {
+	IDataObject,
+} from 'n8n-workflow';
+
+export async function demioApiRequest(this: IHookFunctions | IExecuteFunctions | IExecuteSingleFunctions | ILoadOptionsFunctions, method: string, resource: string, body: any = {}, qs: IDataObject = {}, uri?: string, option: IDataObject = {}): Promise<any> { // tslint:disable-line:no-any
+	try {
+		const credentials = this.getCredentials('demioApi');
+		if (credentials === undefined) {
+			throw new Error('No credentials got returned!');
+		}
+		let options: OptionsWithUri = {
+			headers: {
+				'Api-Key': credentials.apiKey,
+				'Api-Secret': credentials.apiSecret,
+			},
+			method,
+			qs,
+			body,
+			uri: uri || `https://my.demio.com/api/v1${resource}`,
+			json: true,
+		};
+
+		options = Object.assign({}, options, option);
+
+		return await this.helpers.request!(options);
+	} catch (error) {
+
+		if (error.response && error.response.body && error.response.body.message) {
+			// Try to return the error prettier
+			const errorBody = error.response.body;
+			throw new Error(`Demio error response [${error.statusCode}]: ${errorBody.message}`);
+		}
+
+		// Expected error data did not get returned so throw the actual error
+		throw error;
+	}
+}