add messagebird API

improve code readability

fixed a minor error

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

@@ -0,0 +1,68 @@
+import { IExecuteFunctions, IHookFunctions } from 'n8n-core';
+import { OptionsWithUri } from 'request';
+
+import { IDataObject } from 'n8n-workflow';
+
+/**
+ * Make an API request to Message Bird
+ *
+ * @param {IHookFunctions} this
+ * @param {string} method
+ * @param {string} url
+ * @param {object} body
+ * @returns {Promise<any>}
+ */
+export async function messageBirdApiRequest(
+	this: IHookFunctions | IExecuteFunctions,
+	method: string,
+	resource: string,
+	body: IDataObject,
+	query?: IDataObject
+): Promise<any> {
+	const credentials = this.getCredentials('messageBirdApi');
+	if (credentials === undefined) {
+		throw new Error('No credentials returned!');
+	}
+
+	if (query === undefined) {
+		query = {};
+	}
+	let token;
+	token = token = `AccessKey ${credentials.accessKey}`;
+
+	const options: OptionsWithUri = {
+		headers: {
+			Accept: 'application/json',
+			Authorization: token
+		},
+		method,
+		qs: query,
+		body,
+		uri: `https://rest.messagebird.com${resource}`,
+		json: true
+	};
+
+	try {
+		return await this.helpers.request(options);
+	} catch (error) {
+		if (error.statusCode === 401) {
+			throw new Error('The Message Bird credentials are not valid!');
+		}
+
+		if (error.response && error.response.body && error.response.body.errors) {
+			// Try to return the error prettier
+			let errorMessage;
+			for (let i = 0; i < error.response.body.errors.length; i++) {
+				errorMessage =
+					errorMessage +
+					`Message Bird Error response [${error.statusCode}]: ${error.response.body.errors[i].description}`;
+			}
+			throw new Error(errorMessage);
+		}
+
+		// If that data does not exist for some reason return the actual error
+		throw new Error(
+			`Message Bird error ${error.response.body.errors[0].description}`
+		);
+	}
+}