✨ Box Node and Trigger (#765)

* ✨ Box Node and Trigger

* ⚡ Improvements

* ⚡ small fix

* 🐛 Add missing interface

* ⚡  add search operation

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

@@ -0,0 +1,85 @@
+import {
+	OptionsWithUri,
+} from 'request';
+
+import {
+	IExecuteFunctions,
+	IExecuteSingleFunctions,
+	ILoadOptionsFunctions,
+	IHookFunctions,
+} from 'n8n-core';
+
+import {
+	IDataObject,
+	IOAuth2Options,
+} from 'n8n-workflow';
+
+export async function boxApiRequest(this: IExecuteFunctions | IExecuteSingleFunctions | ILoadOptionsFunctions | IHookFunctions, method: string, resource: string, body: any = {}, qs: IDataObject = {}, uri?: string, option: IDataObject = {}): Promise<any> { // tslint:disable-line:no-any
+
+	let options: OptionsWithUri = {
+		headers: {
+			'Content-Type': 'application/json',
+		},
+		method,
+		body,
+		qs,
+		uri: uri || `https://api.box.com/2.0${resource}`,
+		json: true,
+	};
+	options = Object.assign({}, options, option);
+
+	try {
+		if (Object.keys(body).length === 0) {
+			delete options.body;
+		}
+
+		const oAuth2Options: IOAuth2Options = {
+			includeCredentialsOnRefreshOnBody: true,
+		};
+
+		//@ts-ignore
+		return await this.helpers.requestOAuth2.call(this, 'boxOAuth2Api', options, oAuth2Options);
+
+	} catch (error) {
+
+		let errorMessage;
+
+		if (error.response && error.response.body) {
+
+			if (error.response.body.context_info && error.response.body.context_info.errors) {
+
+				const errors = error.response.body.context_info.errors;
+
+				errorMessage = errors.map((e: IDataObject) => e.message);
+
+				errorMessage = errorMessage.join('|');
+
+			} else if (error.response.body.message) {
+
+				errorMessage = error.response.body.message;
+
+			}
+
+			throw new Error(`Box error response [${error.statusCode}]: ${errorMessage}`);
+		}
+		throw error;
+	}
+}
+
+export async function boxApiRequestAllItems(this: IExecuteFunctions | ILoadOptionsFunctions | IHookFunctions, propertyName: string, method: string, endpoint: string, body: any = {}, query: IDataObject = {}): Promise<any> { // tslint:disable-line:no-any
+
+	const returnData: IDataObject[] = [];
+
+	let responseData;
+	query.limit = 100;
+	query.offset = 0;
+	do {
+		responseData = await boxApiRequest.call(this, method, endpoint, body, query);
+		query.offset = responseData['offset'] + query.limit;
+		returnData.push.apply(returnData, responseData[propertyName]);
+	} while (
+		responseData[propertyName].length !== 0
+	);
+
+	return returnData;
+}