smartfacecloud-emulator-dispatcher/src/file/file-index.js

Handles Emulator Dispatcher Part of SmartfaceCloud

const FileService = require('./FileService');

function Service() {
	const FILE_SERVICE = "file-transfer";
	const self = this;

	this.eventEmitter = null;
	this.fileService = new FileService();

	this.init = function(emitter, opts) {
		if (!emitter) {
			throw new Error('Required parameters are missing');
		}

		if (self.eventEmitter) {
			self.eventEmitter.removeListener('connection', onConnection);
			self.eventEmitter.removeListener('message', onMessage);
		}

		self.eventEmitter = emitter;
		self.eventEmitter.on('connection', onConnection);
		self.eventEmitter.on('message', onMessage);
		self.fileService.init(emit, opts);
	};

	this.replaceWebsocket = function(ws) {
		self.fileService.replaceWebsocket(ws);
	};

	function onConnection(data) {
		if (!data.meta || data.meta.service !== FILE_SERVICE) {
			return;
		}
	}

	function onMessage(data) {
		if (skip(data.meta)) {
			return;
		}
		data.data.__deviceId = data.meta.deviceId;
		self.fileService.handleMessage(data.meta.from, removeMeta(data));
	}

	function addMeta(to, command, message) {
		var messageWithMeta = {
			"meta": {
				"from": FILE_SERVICE,
				"to": to,
				"command": command
			},
			"data": message
		};
		return messageWithMeta;
	}

	function removeMeta(data) {
		return data.data;
	}

	function skip(meta) {
		if (meta.from === FILE_SERVICE) {
			return true;
		}
		if (meta.to === FILE_SERVICE || meta.to === "*") {
			return false;
		}
		return true;
	}

	function emit(event, to, command, message) {
		self.eventEmitter.emit(event, addMeta(to, command, message));
	}
}

module.exports = Service;