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server_stream.js
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server_stream.js
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/*
* Audio streaming server
*
* 07.01.2020
*
* */
const http = require('http');
const fs = require('fs');
const request = require('request');
////////////////////////////////////////////////////////////////////////////////////////////////////
////////////////////// GLOBAL CONSTANTS & VARIABLES ////////////////////////////////
////////////////////////////////////////////////////////////////////////////////////////////////////
let PORT = 10010;
let URL_PAYSERVER = "http://localhost:9000";
let PROVIDER = "rosipoc01";
let VERSION = "ROSI POC AUDIO 0.1";
let SUGGESTED_COLLATERAL = 200;
let STDCOMMENT = "";
const COVER_NAME = "/folder.jpg";
const DIR_DB = 'db';
const STREAMS_DB = "db/streams.json";
const RELEVANT_TAGS = [ 'title',
'album',
'artist',
'album_artist',
'genre',
'track',
'disc',
'date'
];
const OPTIONAL_TAGS = [ 'comment'
];
const URL_SLICE = 'slice';
const URL_COVER = 'cover';
const URL_SEARCH = 'search';
const URL_SRVINFO = 'info';
const MAX_LIST_RESULTS = 1000;
let albums = [];
////////////////////// USE ENVIRONMENT VARIABLES IF AVAILABLE ////////////////////////////////
if(typeof process.env.npm_package_config_port != "undefined")
{
PORT = parseInt(process.env.npm_package_config_port);
console.log("Using Environment Variable for PORT, value: " + PORT);
}
if(typeof process.env.npm_package_version != "undefined")
{
VERSION = process.env.npm_package_version;
console.log("Using Environment Variable for VERSION, value: " + VERSION);
}
if(typeof process.env.npm_package_config_provider == "string")
{
PROVIDER = process.env.npm_package_config_provider;
console.log("Using Environment Variable for PROVIDER, value: " + PROVIDER);
}
if(typeof process.env.npm_package_config_stdcomment == "string")
{
STDCOMMENT = process.env.npm_package_config_stdcomment;
console.log("Using Environment Variable for STDCOMMENT, value: " + STDCOMMENT);
}
if(typeof process.env.npm_package_config_payserver == "string")
{
URL_PAYSERVER = process.env.npm_package_config_payserver;
console.log("Using Environment Variable for URL_PAYSERVER, value: " + URL_PAYSERVER);
}
if(typeof process.env.npm_package_config_suggestedCollateral != "undefined")
{
SUGGESTED_COLLATERAL = parseInt(process.env.npm_package_config_suggestedCollateral);
console.log("Using Environment Variable for SUGGESTED_COLLATERAL, value: " +
SUGGESTED_COLLATERAL);
}
////////////////////////////////////////////////////////////////////////////////////////////////////
///////////////////////////// HELPERS ////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////////////////////////////
let streamInfoMapper = (s) => {
let o = s.info;
o.id = s.id;
o.cover = "/" + URL_COVER + "/" + s.info.albumID;
o.ppm = s.slice.price * 60 / s.slice.duration;
o.provider = PROVIDER;
return o;
};
let requestWebBalance = function(payID)
{
return new Promise((resolve, reject) => {
try
{
if(!Array.isArray(payID))
payID = [payID];
let psRequest = {
action: 'getWebBalance',
payID: payID
};
request.post(URL_PAYSERVER, {json: true, body: psRequest}, (err, res, body) => {
if (!err && res.statusCode === 200)
{
try
{
if(body.accepted == true)
resolve(body.balances);
else
reject("REQUEST_NOT_ACCEPTED");
return;
}catch(e)
{
reject(e);
return;
}
}
else
{
reject(err);
return;
}
});
}
catch(e)
{
console.error("Error when requesting balance: " + e);
reject(e);
return;
}
});
}
////////////////////////////////////////////////////////////////////////////////////////////////////
///////////////////////////// SERVER ////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////////////////////////////
http.createServer(function(req, res)
{
console.log("Requesting url:", req.url);
// As this should be public service, allow all websites to access it
res.setHeader('Access-Control-Allow-Origin', '*');
res.setHeader('Access-Control-Allow-Methods', 'GET, POST');
res.setHeader('Access-Control-Allow-Headers', 'X-Requested-With,content-type');
res.setHeader('Access-Control-Expose-Headers', '*');
/* GET STREAM SLICE / STREAM SETUP INFORMATION */
if (req.url.split("/", 3)[1] == URL_SLICE) // get slice
{
let rawbuffer = '';
req.on('data', function(data) {
rawbuffer += data;
});
req.on('end', function() {
let respondError = (e) => {
console.error("Error serving slice request:", e);
res.writeHead(200, {
'Content-Type': 'application/json'
});
res.end(JSON.stringify({
accepted: false,
error: 'REQUEST_ERROR'
}));
};
try {
let sreq;
try {
sreq = JSON.parse(rawbuffer);
} catch (e) {
// Invalid JSON - return empty response
res.writeHead(200);
res.end();
return;
};
// sreq.id : ID of stream is index in streams array
// sreq.no: Number of slice of selected stream
sreq.id = Number(sreq.id);
sreq.id = sreq.id < 0 || sreq.id >= streams.length ? 0 : sreq.id;
let stream = streams[sreq.id];
let info = stream.info;
sreq.no = Number(sreq.no);
sreq.no = sreq.no < -1 || sreq.no >= stream.slice.count ? -1 : sreq.no;
let payID = sreq.payID.replace(/\W/g, '');
let respondSuccess = (paymentSuccess, remainingBalance) => {
res.writeHead(200, {
'Content-Type': stream.mime,
'Server-Version': VERSION,
'Stream-Id': sreq.id,
'Stream-Title': info.title,
'Stream-Album': info.album,
'Stream-Artist': info.artist,
'Stream-AlbumArtist': info.album_artist,
'Stream-AlbumID': info.albumID,
'Stream-Genre': info.genre,
'Stream-Track': info.track,
'Stream-Disc': info.disc,
'Stream-Date': info.date,
'Stream-Duration': info.duration,
'Stream-Comment': (typeof info.comment == "string" ?
info.comment : STDCOMMENT),
'Slice-No': sreq.no,
'Slice-Of': stream.slice.length,
'Slice-Duration': stream.slice.duration,
/// ROSI SPACESAVERS ...
'Rosi-Provider': PROVIDER,
'Rosi-Accepted': paymentSuccess,
'Rosi-Remaining': remainingBalance,
'Rosi-Price': stream.slice.price,
'Rosi-Collateral': SUGGESTED_COLLATERAL
});
if(sreq.no != -1)
res.end(fs.readFileSync(stream.dir + sreq.no + '.' + stream.file));
else
res.end(); // Just send headers for initialisation
console.log('Slice', sreq.no ,'sent. Remaining balance: ' + remainingBalance);
};
// slice no -1 is (free) init information (no stream data is sent, just header)
if(sreq.no != -1 && stream.slice.price != 0)
{
/// PAYMENT ///
let psRequest = {
action: 'claimDeposit',
payID: payID,
amount: stream.slice.price
};
request.post(URL_PAYSERVER, {json: true, body: psRequest}, (err, res, body) => {
if (!err && res.statusCode === 200)
{
try
{
respondSuccess(body.accepted == true ? 'true' : 'false',
Number(body.available));
/// PAYMENT FINISH ///
return;
}catch(e)
{
respondError(e);
return;
}
}
else
{
respondError(err);
return;
}
});
}
else
{
requestWebBalance(payID).then(balances => {
respondSuccess('true', balances.reduce((a,v) => a + v));
}).catch(e => {
console.error("Error when getting payID balances: " + e);
console.log("Continuing anyway...");
respondSuccess('true', 0);
});
}
} catch (e) {
respondError(e);
return;
}
});
}
else if (req.url.split("/", 3)[1] == URL_SEARCH) /* SEARCH FOR STREAM */
{
let rawbuffer = '';
req.on('data', function(data) {
rawbuffer += data;
});
req.on('end', function() {
try {
let sreq;
try {
sreq = JSON.parse(rawbuffer);
} catch (e) {
// Invalid JSON - return empty response
res.writeHead(200);
res.end();
return;
};
// return requested data
res.writeHead(200, {
'Content-Type': 'application/json'
});
if (sreq.type === 'generalTitle')
{
// Sanitisation of filters
let filters = {};
let activefilters = [];
for (let i = 0; i < RELEVANT_TAGS.length; i++) {
if (typeof sreq[RELEVANT_TAGS[i]] !== 'undefined') {
activefilters.push(RELEVANT_TAGS[i]);
filters[RELEVANT_TAGS[i]] = sreq[RELEVANT_TAGS[i]];
}
}
let sresult = [];
// Get elements
if (activefilters.length === 0) {
// return the newest few elements
sresult = streams.slice(-1 * MAX_LIST_RESULTS);
} else {
sresult = streams.filter(s => {
for (let i = 0, rf = false; i < activefilters.length; i++, rf = false) {
let filter = activefilters[i];
let values = filters[filter];
for (let j = 0; j < values.length; j++) {
if (s.info[filter].toLowerCase().indexOf(values[j].toLowerCase())
> -1)
{
rf = true;
break;
}
}
if (!rf)
return false;
}
return true;
});
}
res.end(JSON.stringify(sresult.map(streamInfoMapper)));
console.log('Sent Streamlist.');
}
else if (sreq.type === 'album')
{
let searchString = typeof sreq.searchString === 'string' ?
sreq.searchString : '';
res.end(JSON.stringify(albums.filter(a =>
a.album.toLowerCase().indexOf(searchString.toLowerCase()) > -1)));
console.log('Sent Albumlist.');
}
else if (sreq.type === 'albumTitles')
{
res.end(JSON.stringify(streams.filter(s =>
s.info.albumID === sreq.albumID).map(streamInfoMapper)));
console.log('Sent Albumtitles.');
}
} catch (e) {
console.error("Error serving slice request:", e);
res.writeHead(200, {
'Content-Type': 'application/json'
});
res.end(JSON.stringify({
accepted: false,
error: 'REQUEST_ERROR'
}));
return;
}
});
}
else if (req.url.split("/", 3)[1] == URL_SRVINFO) /* GET GENERAL SERVER INFORMATION */
{
let rawbuffer = '';
req.on('data', function(data) {
rawbuffer += data;
});
req.on('end', function() {
try {
let sreq;
try {
sreq = JSON.parse(rawbuffer);
} catch (e) {
// Invalid JSON - return empty response
res.writeHead(200);
res.end();
return;
};
// return requested info
res.writeHead(200, {
'Content-Type': 'application/json'
});
res.end(JSON.stringify({
accepted: true,
version: VERSION,
provider: PROVIDER,
maxListResults: MAX_LIST_RESULTS,
suggestedCollateral: SUGGESTED_COLLATERAL
// more info to be added here when necessary ...
}));
} catch (e) {
console.error("Error serving slice request:", e);
res.writeHead(200, {
'Content-Type': 'application/json'
});
res.end(JSON.stringify({
accepted: false,
error: 'REQUEST_ERROR'
}));
return;
}
});
}
else if (req.url.split("/", 3)[1] == URL_COVER) /* GET ALBUM COVER */
{
let rawbuffer = '';
req.on('data', function(data) {
// No data should be sent
});
req.on('end', function()
{
try
{
let albumId = req.url.split("/", 4)[2];
if(fs.existsSync('db/audio/' + albumId + COVER_NAME))
{
res.writeHead(200, {
'Content-Type': 'image/jpeg'
});
res.end(fs.readFileSync('db/audio/' + albumId + COVER_NAME));
return;
}
else
throw Error("Not found.");
}
catch (e)
{
res.writeHead(200, {
'Content-Type': 'image/jpeg'
});
res.end(fs.readFileSync('player/www/images/cover_default.jpg'));
}
});
}
else
{
res.writeHead(404, {
'Content-Type': 'text/html'
});
res.end("Site not found.");
};
}).listen(PORT);
////////////////////////////////////////////////////////////////////////////////////////////////////
///////////////////////////// INIT ////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////////////////////////////
const streams = JSON.parse(fs.readFileSync(STREAMS_DB)).map((s, i) => { return {...s, id: i}; });
streams.forEach(s => {
if (albums.filter(a => a.albumID == s.info.albumID).length === 0) {
albums.push({
albumID: s.info.albumID,
album: s.info.album,
artist: s.info.album_artist,
date: s.info.date,
genre: s.info.genre,
cover: "/" + URL_COVER + "/" + s.info.albumID,
provider: PROVIDER
});
}
});
console.log("Available Albums:");
console.log(albums.map(a => a.album).join('\n'));
console.log("Server listening on Port", PORT);