✨ Add LignvaNex Node (#1194)

* ✨ Add LignvaNex node

* ⚡ Small improvement to LingvaNext Node

Improvements to #1191

Co-authored-by: Tanay Pant <tanaypant@protonmail.com>

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

@@ -0,0 +1,54 @@
+import {
+	OptionsWithUri,
+} from 'request';
+
+import {
+	IExecuteFunctions,
+	IExecuteSingleFunctions,
+	IHookFunctions,
+	ILoadOptionsFunctions,
+} from 'n8n-core';
+
+import {
+	IDataObject,
+} from 'n8n-workflow';
+
+export async function lingvaNexApiRequest(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('lingvaNexApi');
+		if (credentials === undefined) {
+			throw new Error('No credentials got returned!');
+		}
+		let options: OptionsWithUri = {
+			headers: {
+				Authorization: `Bearer ${credentials.apiKey}`,
+			},
+			method,
+			qs,
+			body,
+			uri: uri || `https://api-b2b.backenster.com/b1/api/v3${resource}`,
+			json: true,
+		};
+
+		options = Object.assign({}, options, option);
+
+		const response = await this.helpers.request!(options);
+
+		if (response.err !== null) {
+			throw new Error(`LingvaNex error response [400]: ${response.err}`);
+		}
+
+		return response;
+
+	} catch (error) {
+
+		if (error.response && error.response.body && error.response.body.message) {
+			// Try to return the error prettier
+			const errorBody = error.response.body;
+			throw new Error(`LingvaNex error response [${error.statusCode}]: ${errorBody.message}`);
+		}
+
+		// Expected error data did not get returned so throw the actual error
+		throw error;
+	}
+}