n8n/packages/nodes-base/nodes/Dropbox/GenericFunctions.ts

import { IExecuteFunctions, IHookFunctions } from 'n8n-core';
import { OptionsWithUri } from 'request';

/**
 * Make an API request to Dropbox
 *
 * @param {IHookFunctions} this
 * @param {string} method
 * @param {string} url
 * @param {object} body
 * @returns {Promise<any>}
 */
export async function dropboxApiRequest(
	this: IHookFunctions | IExecuteFunctions,
	method: string,
	endpoint: string,
	body: object,
	headers?: object,
	encoding?: string | null
): Promise<any> {
	// tslint:disable-line:no-any

	const options: OptionsWithUri = {
		headers,
		method,
		body,
		uri: endpoint,
		json: true,
		encoding
	};

	if (!Object.keys(body).length) {
		delete options.body;
	}

	if (encoding !== null) {
		delete options.encoding;
  }
  
	const authenticationMethod = this.getNodeParameter(
		'authentication',
		0
	) as string;

	try {
		if (authenticationMethod === 'accessToken') {
			return await this.helpers.request(options);
		} else {
			return await this.helpers.requestOAuth.call(
				this,
				'dropboxOAuth2Api',
				options
			);
		}
	} catch (error) {
		if (error.statusCode === 401) {
			// Return a clear error
			throw new Error('The Dropbox credentials are not valid!');
		}

		if (error.error && error.error.error_summary) {
			// Try to return the error prettier
			throw new Error(
				`Dropbox error response [${error.statusCode}]: ${error.error.error_summary}`
			);
		}

		// If that data does not exist for some reason return the actual error
		throw error;
	}
}