app_utils.py

import streamlit as st
import numpy as np
import os
import pickle
import spotipy
import spotipy.util as sp_util
import requests

dir_path = os.path.dirname(os.path.realpath(__file__))

# current mess: https://github.com/plamere/spotipy/issues/632
def centered_button(func, text, n_columns=7, args=None):
    columns = st.columns(np.ones(n_columns))
    with columns[n_columns//2]:
        return func(text)

# get credentials
def setup_credentials():
    if 'client_id' in os.environ.keys() and 'client_secret' in os.environ.keys():
        client_info = dict(client_id=os.environ['client_id'],
                           client_secret=os.environ['client_secret'])
    else:
        with open(dir_path + "/ids.pk", 'rb') as f:
            client_info = pickle.load(f)

    os.environ['SPOTIPY_CLIENT_ID'] = client_info['client_id']
    os.environ['SPOTIPY_CLIENT_SECRET'] = client_info['client_secret']
    os.environ['SPOTIPY_REDIRECT_URI'] = 'http://localhost:8080/'
    return client_info

relevant_audio_features = ["danceability", "energy", "loudness", "mode", "valence", "tempo"]


def get_client():
    scope = "playlist-modify-public"
    token = sp_util.prompt_for_user_token(scope=scope)
    sp = spotipy.Spotify(auth=token)
    user_id = sp.me()['id']
    return sp, user_id


def new_get_client(session):
    scope = "playlist-modify-public"
    print('Here3')

    cache_handler = StreamlitCacheHandler(session)
    auth_manager = spotipy.oauth2.SpotifyOAuth(scope=scope,
                                               cache_handler=cache_handler,
                                               show_dialog=True)
    print('Here4')
    sp, user_id = None, None

    if requests.get("code"):
        # Step 2. Being redirected from Spotify auth page
        auth_manager.get_access_token(requests.get("code"))
        print('Here7')
        sp = spotipy.Spotify(auth_manager=auth_manager)
        user_id = sp.me()['id']


    if not auth_manager.validate_token(cache_handler.get_cached_token()):
        print('Here6')
        # Step 1. Display sign in link when no token
        auth_url = auth_manager.get_authorize_url()
        st.markdown(f'[Click here to log in]({auth_url})', unsafe_allow_html=True)
    return sp, user_id



def extract_uris_from_links(links, url_type):
    assert url_type in ['playlist', 'artist', 'user']
    urls = links.split('\n')
    uris = []
    for url in urls:
        if 'playlist' in url:
            uri = url.split(f'{url_type}/')[-1].split('?')[0]
        else:
            uri = url.split('?')[0]
        uris.append(uri)
    return uris

def wall_of_checkboxes(labels, max_width=10):
    n_labels = len(labels)
    n_rows = int(np.ceil(n_labels/max_width))
    checkboxes = []
    for i in range(n_rows):
        columns = st.columns(np.ones(max_width))
        row_length = n_labels % max_width if i == n_rows - 1 else max_width
        for j in range(row_length):
            with columns[j]:
                checkboxes.append(st.empty())
    return checkboxes

def aggregate_genres(genres, legit_genres, verbose=False):
    genres_output = dict()
    legit_genres_formatted = [lg.replace('-', '').replace(' ', '') for lg in legit_genres]
    for glabel in genres.keys():
        if verbose: print('\n', glabel)
        glabel_formatted = glabel.replace(' ', '').replace('-', '')
        best_match = None
        best_match_score = 0
        for legit_glabel, legit_glabel_formatted in zip(legit_genres, legit_genres_formatted):
            if 'jazz' in glabel_formatted:
                best_match = 'jazz'
                if verbose: print('\t', 'pop')
                break
            if 'ukpop' in glabel_formatted:
                best_match = 'pop'
                if verbose: print('\t', 'pop')
                break
            if legit_glabel_formatted == glabel_formatted:
                if verbose: print('\t', legit_glabel_formatted)
                best_match = legit_glabel
                break
            elif glabel_formatted in legit_glabel_formatted:
                if verbose: print('\t', legit_glabel_formatted)
                if len(glabel_formatted) > best_match_score:
                    best_match = legit_glabel
                    best_match_score = len(glabel_formatted)
            elif legit_glabel_formatted in glabel_formatted:
                if verbose: print('\t', legit_glabel_formatted)
                if len(legit_glabel_formatted) > best_match_score:
                    best_match = legit_glabel
                    best_match_score = len(legit_glabel_formatted)

        if best_match is not None:
            if verbose: print('\t', '-->', best_match)
            if best_match in genres_output.keys():
                genres_output[best_match] += genres[glabel]
            else:
                genres_output[best_match] = genres[glabel]
    return genres_output



class StreamlitCacheHandler(spotipy.cache_handler.CacheHandler):
    """
    A cache handler that stores the token info in the session framework
    provided by streamlit.
    """

    def __init__(self, session):
        self.session = session

    def get_cached_token(self):
        token_info = None
        try:
            token_info = self.session["token_info"]
        except KeyError:
            print("Token not found in the session")

        return token_info

    def save_token_to_cache(self, token_info):
        try:
            self.session["token_info"] = token_info
        except Exception as e:
            print("Error saving token to cache: " + str(e))