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

import { OptionsWithUri } from 'request';

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

export async function rocketchatApiRequest(this: IHookFunctions | IExecuteFunctions | IExecuteSingleFunctions | ILoadOptionsFunctions, resource: string, method: string, operation: string, body: any = {}, headers?: object): Promise<any> { // tslint:disable-line:no-any
	
	const credentials = this.getCredentials('rocketchatApi');

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

    const headerWithAuthentication = Object.assign({}, headers, 
        { 'X-Auth-Token': credentials.authKey, 'X-User-Id': credentials.userId   });

    const endpoint = 'rocket.chat/api/v1';

	const options: OptionsWithUri = {
		headers: headerWithAuthentication,
		method,
		body,
		uri: `https://${credentials.subdomain}.${endpoint}${resource}.${operation}`,
		json: true
	};

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

	try {
		return await this.helpers.request!(options);
	} catch (error) {
		console.error(error);

		const errorMessage = error.response.body.message || error.response.body.Message;

		if (errorMessage !== undefined) {
			throw errorMessage;
		}
		throw error.response.body;
	}
}

export function validateJSON(json: string | undefined): any { // tslint:disable-line:no-any
	let result;
	try {
		result = JSON.parse(json!);
	} catch (exception) {
		result = [];
	}
	return result;
}