n8n/packages/nodes-base/nodes/Google/Task/GenericFunctions.ts

import {
	OptionsWithUri,
} from 'request';

import {
	IExecuteFunctions,
	IExecuteSingleFunctions,
	ILoadOptionsFunctions,
} from 'n8n-core';

import {
	IDataObject,
} from 'n8n-workflow';

export async function googleApiRequest(
	this: IExecuteFunctions | IExecuteSingleFunctions | ILoadOptionsFunctions,
	method: string,
	resource: string,
	body: IDataObject = {},
	qs: IDataObject = {},
	uri?: string,
	headers: IDataObject = {}
): Promise<any> { // tslint:disable-line:no-any
	const options: OptionsWithUri = {
		headers: {
			'Content-Type': 'application/json'
		},
		method,
		body,
		qs,
		uri: uri || `https://www.googleapis.com${resource}`,
		json: true
	};

	try {
		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.requestOAuth2.call(
			this,
			'googleTasksOAuth2Api',
			options
		);
	} catch (error) {
		if (error.response && error.response.body && error.response.body.error) {

			let errors = error.response.body.error.errors;

			errors = errors.map((e: IDataObject) => e.message);
			// Try to return the error prettier
			throw new Error(
				`Google Tasks error response [${error.statusCode}]: ${errors.join('|')}`
			);
		}
		throw error;
	}
}

export async function googleApiRequestAllItems(
	this: IExecuteFunctions | ILoadOptionsFunctions,
	propertyName: string,
	method: string,
	endpoint: string,
	body: IDataObject = {},
	query: IDataObject = {}
): Promise<any> { // tslint:disable-line:no-any
	const returnData: IDataObject[] = [];

	let responseData;
	query.maxResults = 100;

	do {
		responseData = await googleApiRequest.call(
			this,
			method,
			endpoint,
			body,
			query
		);
		query.pageToken = responseData['nextPageToken'];
		returnData.push.apply(returnData, responseData[propertyName]);
	} while (
		responseData['nextPageToken'] !== undefined &&
		responseData['nextPageToken'] !== ''
	);

	return returnData;
}