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

import { OptionsWithUri } from 'request';

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

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

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

	const options: OptionsWithUri = {
		method,
		headers: {
			'User-Agent': 'n8n',
			'Content-Type': 'text/plain',
			'Accept': ' application/json',
		},
		body,
		qs: query,
		uri: uri || `https://api.spotify.com/v1${endpoint}`,
		json: true
	};

	try {
		const credentials = this.getCredentials('spotifyOAuth2Api');

		if (credentials === undefined) {
			throw new Error('No credentials got returned!');
		}

		if (Object.keys(body).length === 0) {
			delete options.body;
		}

		return await this.helpers.requestOAuth2.call(this, 'spotifyOAuth2Api', options);
	} catch (error) {
		if (error.statusCode === 401) {
            // Return a clear error
            throw new Error('The Spotify credentials are not valid!');
        }

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

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

export async function spotifyApiRequestAllItems(this: IHookFunctions | IExecuteFunctions,
	propertyName: string, method: string, endpoint: string, body: object, query?: object): Promise<any> { // tslint:disable-line:no-any

	const returnData: IDataObject[] = [];

	let responseData;

	let uri: string | undefined;

	do {
		responseData = await spotifyApiRequest.call(this, method, endpoint, body, query, uri);
		returnData.push.apply(returnData, responseData[propertyName]);
		uri = responseData.next;

	} while (
		responseData['next'] !== null
	);

	return returnData;
}