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trending.js
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trending.js
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const fs = require('fs')
const path = require('path')
const request = require('request')
const cheerio = require('cheerio')
const FILE_PATH = path.resolve(__dirname, 'docs', 'json', 'trending.json')
function getPodcast (term) {
let itunesAPI = encodeURI(`https://itunes.apple.com/search?entity=podcast&&limit=1&&term=${term}`)
return new Promise((resolve, reject) => {
request(itunesAPI, (err, response, body) => {
if (err) return resolve({})
try {
let { results } = JSON.parse(body)
results.length > 0
? resolve({
id: results[0].collectionId,
title: results[0].collectionName,
artist: results[0].artistName,
imageUrl: results[0].artworkUrl100.replace(/\/[^/]*$/, ''),
feedUrl: results[0].feedUrl
})
: resolve({})
} catch (err) {
resolve({})
}
})
})
}
function getTrending () {
let pad = x => '00'.concat(String(x)).slice(-2)
let date = new Date(Date.now() - 86400000)
let itunesChartsURL = `http://www.itunescharts.net/us/charts/podcasts/${date.getFullYear()}/${pad(date.getMonth() + 1)}/${pad(date.getDate())}`
return new Promise((resolve, reject) => {
request(itunesChartsURL, (err, response, body) => {
if (err) return reject(err)
let $ = cheerio.load(body)
let res = []
$('#chart .entry a').each((i, html) => {
res.push($(html).text())
})
resolve(res)
})
})
}
async function trendingPodcasts () {
let trending = await getTrending()
let podcasts = await Promise.all(trending.map(getPodcast))
return podcasts.filter(x => Object.keys(x).length > 0)
}
trendingPodcasts()
.then(res => {
fs.writeFile(FILE_PATH, JSON.stringify(res, undefined, 2), err => {
if (err) console.log(err)
})
console.log('File saved.')
})
.catch(console.log)