playlistChecker.py

import time
import json

import requests
from bs4 import BeautifulSoup
from urllib.parse import urljoin

def fetchPage(session, url):
    try:
        response = session.get(url, timeout=30)
        response.raise_for_status()
        return response
    except requests.exceptions.RequestException as e:
        print(f"Request failed: {e}. Retrying in 10 seconds...")
        time.sleep(10)
        return(fetchPage(session, url))

class Playlist:
    def __init__(self, playlistId):
        self.playlistId = playlistId
        print(playlistId)

    def getPlaylistData(self):
        headers = {
            "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.124 Safari/537.36"
        }

        session = requests.Session()
        session.headers.update(headers)

        response = fetchPage(session, self.playlistId)
        if response.status_code != 200:
            print(f"Failed to retrieve the page. Status code: {response.status_code}")
        soup = BeautifulSoup(response.text, 'html.parser')

        scriptTag = soup.find('script', id='urlSchemeConfig')
        if not scriptTag:
            return(soup)           #< no redirect URL found, assuming it's the correct page

        config = json.loads(scriptTag.string)
        redirectUrl = config.get('redirectUrl')
        if not redirectUrl:
            print("Redirect URL not found in the JSON data.")
            return(-2)

        redirectResponse = session.get(redirectUrl, headers=headers)
        if redirectResponse.status_code != 200:
            print(f"Failed to retrieve the redirected page. Status code: {redirectResponse.status_code}")
            return(-3)

        soup = BeautifulSoup(redirectResponse.text, 'html.parser')
        return(soup)

    def convertToFullUrl(self, url):
        urljoin(self.playlistId, url)

class PlaylistChangeListener(Playlist):
    def __init__(self, playlistId):
        self.playlistId = playlistId
        super().__init__(playlistId)
        self.prevTrackCount = self.getPlaylistTracksCount()

    def getPlaylistTracksCount(self):
        """Fetch current tracks count from the playlist."""

        soup = self.getPlaylistData()

        songCount = soup.find_all('meta', attrs={"name": "music:song_count"})[-1]

        if not songCount:
            return(-4)

        return(int(songCount["content"]))

    def isChange(self):
        trackCount = self.getPlaylistTracksCount()
        if trackCount < 0:
            print("failed to fetch track count")
            return(False)

        # Find changes (added or removed tracks)
        addedTracks = trackCount - self.prevTrackCount
        removedTracks = self.prevTrackCount - trackCount

        if addedTracks or removedTracks:
            self.prevTrackCount = trackCount
            return(True)
        return(False)