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index.js
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/*
* Copyright 2016 Scott Bender <[email protected]>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
const Bacon = require('baconjs');
const path = require('path')
const fs = require('fs')
const _ = require('lodash')
const AWS = require('aws-sdk');
const { createServer, Server, Socket } = require('net')
const split = require('split')
module.exports = function(app) {
var unsubscribes = []
var plugin = {}
var last_states = {}
var config
var server
var idSequence = 0
var pushSockets = []
plugin.start = function(props) {
config = props
var command = {
context: "vessels.self",
subscribe: [{
path: "notifications.*",
policy: 'instant'
}]
}
app.subscriptionmanager.subscribe(command, unsubscribes, subscription_error, got_delta)
start_local_server()
};
function subscription_error(err)
{
app.error("error: " + err)
}
function got_delta(notification)
{
handleNotificationDelta(app, plugin.id,
notification,
last_states)
}
plugin.registerWithRouter = function(router) {
router.post("/registerDevice", (req, res) => {
device = req.body
if ( typeof device.targetArn == 'undefined'
|| typeof device.deviceName == 'undefined'
|| typeof device.accessKey == 'undefined'
|| typeof device.secretAccessKey == 'undefined' )
{
app.debug("invalid request: %O", device)
res.status(400)
res.send("Invalid Request")
return
}
devices = readJson(app, "devices" , plugin.id)
devices[req.body["targetArn"]] = device
saveJson(app, "devices", plugin.id, devices, res)
})
router.post("/deviceEnabled", (req, res) => {
device = req.body
if ( typeof device.targetArn == 'undefined' )
{
app.debug("invalid request: %O", device)
res.status(400)
res.send("Invalid Request")
return
}
devices = readJson(app, "devices" , plugin.id)
if ( devices[req.body["targetArn"]] == null )
{
res.status(404)
res.send("Not registered")
}
else
{
res.send("Device is registered")
}
})
router.post("/unregisterDevice", (req, res) => {
device = req.body
if ( typeof device.targetArn == 'undefined' )
{
app.debug("invalid request:%O ", device)
res.status(400)
res.send("Invalid Request")
return
}
arn = req.body["targetArn"]
devices = readJson(app, "devices" , plugin.id)
if ( devices[arn] == null )
{
res.status(404)
res.send("Not registered")
}
else
{
delete devices[arn]
saveJson(app, "devices", plugin.id, devices, res)
}
})
}
plugin.stop = function() {
unsubscribes.forEach(function(func) { func() })
unsubscribes = []
if (server) {
server.close()
server = null
}
}
plugin.id = "push-notifications"
plugin.name = "Push Notifications"
plugin.description = "Plugin that pushes SignalK notifications to Amazon SNS"
plugin.schema = {
title: "Push Notifications",
properties: {
enableRemotePush: {
title: 'Enable Remote Push',
description: 'Send push notifications via the internet when available',
type: 'boolean',
default: true
},
localPushSSIDs: {
title: 'Local Push SSIDs',
description: 'Comma separated list if Wi-Fi SSIDs where local push should be used',
type: 'string'
},
localPushPort: {
title: 'Local Push Port',
description: 'Port on the server used for local push notifications',
type: 'number',
default: 3001
}
}
}
function handleNotificationDelta(app, id, notification, last_states)
{
//app.debug("notification: %O", notification)
try {
devices = readJson(app, "devices", id)
} catch ( err ) {
if (e.code && e.code === 'ENOENT') {
//return
}
//app.error(err)
}
notification.updates.forEach(function(update) {
update.values.forEach(function(value) {
if ( value.value != null
&& typeof value.value.message != 'undefined'
&& value.value.message != null )
{
if ( (last_states[value.path] == null
&& value.value.state != 'normal')
|| ( last_states[value.path] != null
&& last_states[value.path] != value.value.state) )
{
last_states[value.path] = value.value.state
app.debug("message: %s", value.value.message)
if ( typeof config.enableRemotePush === 'undefined'
|| config.enableRemotePush )
{
_.forIn(devices, function(device, arn) {
if ( !deviceIsLocal(device) ) {
send_push(app, device, value.value.message, value.path, value.value.state)
} else {
app.debug("Skipping device %s because it's local", device.deviceName)
}
})
}
send_local_push(value.value.message, value.path, value.value.state)
}
}
else if ( last_states[value.path] )
{
delete last_states[value.path]
}
})
})
}
function pathForPluginId(app, id, name) {
var dir = app.config.configPath || app.config.appPath
return path.join(dir, "/plugin-config-data", id + "-" + name + '.json')
}
function readJson(app, name, id) {
try
{
const path = pathForPluginId(app, id, name)
const optionsAsString = fs.readFileSync(path, 'utf8');
try {
return JSON.parse(optionsAsString)
} catch (e) {
app.error("Could not parse JSON options:" + optionsAsString);
return {}
}
} catch (e) {
if (e.code && e.code === 'ENOENT') {
return {}
}
app.error("Could not find options for plugin " + id + ", returning empty options")
app.error(e.stack)
return {}
}
return JSON.parse()
}
function saveJson(app, name, id, json, res)
{
fs.writeFile(pathForPluginId(app, id, name), JSON.stringify(json, null, 2),
function(err) {
if (err) {
app.debug(err.stack)
app.error(err)
res.status(500)
res.send(err)
return
}
else
{
res.send("Success\n")
}
});
}
function get_apns(message, path, state)
{
if ( message.startsWith('Unknown Seatalk Alarm') ) {
return
}
message = `${state.charAt(0).toUpperCase() + state.slice(1)}: ${message}`
aps = { 'aps': { 'alert': {'body': message}, 'sound': 'default', 'content-available': 1 }, 'path': path, self: app.selfId }
let name = app.getSelfPath("name")
if ( name ) {
aps.aps.alert.title = name
}
let category = (state === 'normal' ? "alarm_normal" : "alarm")
if ( state != 'normal' )
{
if ( path === "notifications.autopilot.PilotWayPointAdvance" )
{
category = 'advance_waypoint'
}
else if ( path === 'notifications.anchorAlarm' || path === 'notifications.navigation.anchor')
{
category = 'anchor_alarm'
}
else if ( path.startsWith('notifications.security.accessRequest') )
{
let parts = path.split('.')
let permissions = parts[parts.length-2]
category = `access_req_${permissions}`
}
} else if ( path === "notifications.autopilot.PilotWayPointAdvance" ) {
return
}
aps["aps"]["category"] = category
return aps
}
function send_push(app, device, message, path, state)
{
var aps = get_apns(message, path, state)
if ( !aps ) {
return
}
var sns = new AWS.SNS({
region: "us-east-1",
accessKeyId: device.accessKey,
secretAccessKey: device.secretAccessKey
});
var payload = {
default: message,
APNS: aps,
APNS_SANDBOX: aps
};
// first have to stringify the inner APNS object...
payload.APNS = JSON.stringify(payload.APNS);
payload.APNS_SANDBOX = JSON.stringify(payload.APNS_SANDBOX);
app.debug('sending push to ' + device.targetArn + "payload: " + JSON.stringify(payload, null, 2));
// then have to stringify the entire message payload
payload = JSON.stringify(payload);
sns.publish({
Message: payload,
MessageStructure: 'json',
TargetArn: device.targetArn
}, function(err, data) {
if (err) {
console.log(err.stack);
return;
}
app.debug('push sent');
});
}
function send_local_push(message, path, state)
{
var aps = get_apns(message, path, state)
if ( aps ) {
if ( aps.aps.alert.title ) {
aps.aps.alert.title = `${aps.aps.alert.title} (Local)`
}
pushSockets.forEach(socket => {
try {
socket.write(JSON.stringify(aps) + '\n')
} catch (err) {
app.error('error sending: ' + err)
}
})
}
}
function start_local_server()
{
const port = config.localPushPort || 3001
server = createServer((socket) => {
socket.id = idSequence++
socket.name = socket.remoteAddress + ':' + socket.remotePort
app.debug('Connected:' + socket.id + ' ' + socket.name)
socket.on('error', (err) => {
app.error(err + ' ' + socket.id + ' ' + socket.name)
})
socket.on('close', hadError => {
app.debug('Close:' + hadError + ' ' + socket.id + ' ' + socket.name)
let idx = pushSockets.indexOf(socket)
if ( idx != -1 ) {
pushSockets.splice(idx, 1)
}
})
socket
.pipe(
split((s) => {
if (s.length > 0) {
try {
return JSON.parse(s)
} catch (e) {
console.log(e.message)
}
}
})
)
.on('data', msg => {
if ( msg.heartbeat ) {
socket.write('{"heartbeat":true}')
} else if ( !msg.deviceName || !msg.deviceToken ) {
app.debug('invalid msg: %j', msg)
socket.end()
} else {
socket.device = msg
pushSockets.push(socket)
app.debug('registered device: %j', msg)
}
})
.on('error', (err) => {
app.error(err)
})
socket.on('end', () => {
app.debug('Ended:' + socket.id + ' ' + socket.name)
})
socket.write(JSON.stringify(app.getHello()) + '\n')
setTimeout(() => {
if ( !socket.device ) {
app.debug('closing socket, no registration received')
socket.end()
}
}, 5000)
})
server.on('listening', () =>
app.debug('local push server listening on ' + port)
)
server.on('error', e => {
app.error(`local push server error: ${e.message}`)
app.setProviderError(`can't start local push server ${e.message}`)
})
if (process.env.TCPSTREAMADDRESS) {
app.debug('Binding to ' + process.env.TCPSTREAMADDRESS)
server.listen(port, process.env.TCPSTREAMADDRESS)
} else {
server.listen(port)
}
}
function deviceIsLocal(device) {
return pushSockets.find(socket => {
if ( device.deviceToken ) {
return socket.device.deviceToken == device.deviceToken
} else {
return socket.device.deviceName == device.deviceName
}
})
}
return plugin;
}