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server.js
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server.js
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'use strict';
require('dotenv').config()
var express = require("express");
var app = express();
var path = require("path")
var bodyParser = require("body-parser");
var querystring = require('querystring');
var http = require('http');
var request = require('request');
var favicon = require('serve-favicon');
app.use(favicon(path.join(__dirname, "assets/favicon.png")));
app.use(bodyParser.urlencoded({ extended: false }));
app.use(bodyParser.json());
// Holds onto the authentication key for making requests through Spotify API
var CLIENT_ID = process.env.CLIENT_ID;
var CLIENT_SECRET = process.env.CLIENT_SECRET;
var token = {};
// Home page
app.get('/',function(req,res){
getCredentials(req);
res.sendFile(path.join(__dirname, '/index.html'));
});
// Request for data when user submit an artist/album/track keyword
app.post('/submit', function(req, res) {
getTracks(req.body.input, req.body.option).then(
function(tracks) {
var trackIds = [];
var trackInfo = [];
var items = tracks.tracks.items;
for (var t in items) {
// Congregate all track ids for audio analysis
trackIds.push(items[t].id);
// Congregate track data, but leave color as hsl(0,0,0) by default
var artists = [];
for (var a in items[t].artists ) {
artists.push(items[t].artists[a].name);
}
trackInfo.push({'id': items[t].id,
'image': items[t].album.images.slice(-1)[0].url,
'sound': items[t].preview_url,
'url': items[t].external_urls.spotify,
'name': items[t].name,
'popularity': items[t].popularity,
'album': items[t].album.name,
'artists': artists,
'color': { 'h': 0, 's': 0, 'l': 0 }});
}
// Do another request for track audio features
getFeatures(trackIds.join(',')).then(
function(features) {
// Isolate audio features only
var trackAudioFeatures = features.audio_features;
for (var i = 0; i < trackAudioFeatures.length; i += 1) {
if (trackInfo[i] == undefined) {
continue;
}
var colors = {'red': 0, 'orange': 25, 'yellow': 52,
'green': 110, 'blue': 240, 'violet': 285 };
var trackColor = { 'h': 0, 's': 0, 'l': 0 };
if ("color" in trackInfo[i]) {
trackColor = trackInfo[i].color;
}
var trackFeat = trackAudioFeatures[i];
// Saturation is based on valence and mode
// Lightness is based on energy and mode
if (trackFeat.mode) { // Major modality
trackColor.s = 100 - (trackFeat.valence * 50.0);
trackColor.l = 50 + (trackFeat.energy * 50.0);
// Hue is based on key of song
switch (trackFeat.key) {
case 0: trackColor.s = 0; break; // C
case 1: trackColor.h = colors['violet']; break; // C#
case 2: trackColor.h = colors['violet']; break; // D
case 3: trackColor.h = colors['green']; break; // D#
case 4: trackColor.h = colors['green']; break; // E
case 5: trackColor.h = colors['yellow']; break; // F
case 6: trackColor.h = colors['yellow']; break; // F#
case 7: trackColor.h = colors['orange']; break; // G
case 8: trackColor.h = colors['red']; break; // G#
case 9: trackColor.h = colors['red']; break; // A
case 10: trackColor.h = colors['blue']; break; // A#
case 11: trackColor.h = colors['blue']; break; // B
default:
trackColor.h = 110; break; // Default green color
}
} else { // Minor modality
trackColor.s = 50 - (trackFeat.valence * 50.0);
trackColor.l = (trackFeat.energy * 50.0);
// Hue is based on key of song
switch (trackFeat.key) {
case 0: trackColor.h = colors['red']; break; // Am
case 1: trackColor.h = colors['blue']; break; // Bbm
case 2: trackColor.h = colors['blue']; break; // Bm
case 3: trackColor.s = 0; break; // Cm
case 4: trackColor.s = 0; break; // Dbm
case 5: trackColor.h = colors['violet']; break; // Dm
case 6: trackColor.h = colors['violet']; break; // Ebm
case 7: trackColor.h = colors['green']; break; // Em
case 8: trackColor.h = colors['yellow']; break; // Fm
case 9: trackColor.h = colors['yellow']; break; // Gbm
case 10: trackColor.h = colors['orange']; break; // Gm
case 11: trackColor.h = colors['orange']; break; // G#m
default:
trackColor.h = 110; break; // Default green color
}
}
}
res.send(trackInfo);
}, function(err) { // For Audio Feature request
console.log(err);
});
}, function(err) { // For track/artist search request
console.log(err);
});
});
// TODO: Create front end 404.html page to send
// 404 page
app.get('*', function(req, res) {
res.status(404);
console.log("ah");
res.type('text/html');
res.write('<!DOCTYPE html>');
res.write('<html>');
res.write('<body>');
res.write("404: Page not found!");
res.write('</body>');
res.write('</html>');
res.end();
});
// Start server
if (process.env.PORT)
console.log(`Server is now listening, go to http:\/\/localhost:${process.env.PORT}`);
else
console.log('Server is now listening, go to http://localhost:8080');
app.listen(process.env.PORT || 8080);
var getCredentials = function (req) {
// Get authentification for using Spotify API
var authOptions = {
method: 'POST',
url: 'https://accounts.spotify.com/api/token',
headers: { 'Authorization': 'Basic ' + (new Buffer(CLIENT_ID + ':' + CLIENT_SECRET).toString('base64')) },
form: { grant_type: 'client_credentials' },
json: true
};
request(authOptions, function (error, response, body) {
if (error) {
throw new Error(error);
}
token = body;
console.log('The access token expires in ' + body['expires_in']);
console.log('The access token is ' + body['access_token']);
});
}
var getTracks = function(searchKey, searchOption) {
// Options for request
var options = {
url: 'https://api.spotify.com/v1/search?q=' + searchOption + ':' + searchKey + '&type=track&limit=10',
headers: {
'Authorization': 'Bearer ' + token.access_token
},
json: true
};
// Do the request!
var promise = new Promise(function(resolve, reject) {
request.get(options, function(error, response, body){
resolve (body);
})
});
promise.then(function(data) {
return data;
}, function(err) {
console.log(err);
return [];
});
return promise;
}
var getFeatures = function(trackNames) {
// Options for request
var options = {
url: 'https://api.spotify.com/v1/audio-features/?ids=' + trackNames + '&type=track',
headers: {
'Authorization': 'Bearer ' + token.access_token
},
json: true
};
// Do the request!
var promise = new Promise(function(resolve, reject) {
request.get(options, function(error, response, body){
resolve (body);
})
});
promise.then(function(data) {
return data;
}, function(err) {
console.log(err);
return [];
});
return promise;
}