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tracks.js
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tracks.js
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const querystring = require('querystring');
const got = require('got');
const constants = require('./constants');
const utils = require('./utils');
async function getPlaylistTracks(playlistId, accessToken, numTracks, getAudioFeatures = false) {
/*
Get all tracks in a playlist by its id
accessToken should be a valid api token
numTracks is needed to send all the api requests concurrently
if getAudioFeatures is set to true, additional fields will be returned
Returns an array of track objects
*/
const tracks = [];
var reqUrl = constants.BASE_URL + '/playlists/' + playlistId + '/tracks';
const promises = [];
const batchSize = 100;
for (let offset = 0; offset < numTracks; offset += batchSize) {
const promise = got(reqUrl + "?" + querystring.stringify({
limit: batchSize,
offset
}), {
headers: { 'Authorization': 'Bearer ' + accessToken },
responseType: 'json'
}).then(({ body }) =>
// reformat track fields to be a bit nicer
body.items.map(item => {
item.track["added_at"] = item["added_at"];
item.track["release_date"] = item.track.album["release_date"];
item.track.album = item.track.album.name;
item.track.artists = item.track.artists.map(obj => obj.name).join(", ");
item.track.duration = utils.toHMSstring(item.track["duration_ms"]);
return item.track;
}))
.then(recvdTracks => {
if (getAudioFeatures) {
// send an additional request for audio features by track id
// note response is in same order as request
const ids = recvdTracks.map(item => item.id).join(",");
return got(constants.BASE_URL + "/audio-features?ids=" + ids, {
headers: { 'Authorization': 'Bearer ' + accessToken },
responseType: 'json'
}).then(({ body: audioFeats }) => {
const feats = audioFeats.audio_features.map(item => {
// prune some useless/duplicate fields
delete item.type;
delete item.id;
delete item.uri;
delete item.track_href;
delete item.analysis_url;
delete item.duration_ms;
return item
})
// add extra fields to track objects
for (let i = 0; i < recvdTracks.length; i++) {
Object.assign(recvdTracks[i], feats[i]);
}
return recvdTracks;
})
}
else {
// caller doesn't want audio features, just pass through
return recvdTracks;
}
}).then(recvdTracks => {
tracks.push(...recvdTracks);
});
promises.push(promise);
}
await Promise.all(promises)
return tracks;
}
module.exports = {
getPlaylistTracks
};