Refactor for heroku

backend/helpers.py

@@ -0,0 +1,77 @@
+import requests
+from bs4 import BeautifulSoup
+import json
+import os
+import uuid
+from flask import make_response
+from functools import wraps, update_wrapper
+from datetime import datetime
+
+data_directory = "data"
+config_file = data_directory+"/config.json"
+
+def create_data_directory():
+    if not os.path.exists(data_directory):
+        os.makedirs(data_directory)
+
+
+def get_catalog_url():
+    r = requests.get('https://www.karafun.de/karaoke-song-list.html')
+    soup = BeautifulSoup(r.content, 'html.parser')
+    url = soup.findAll('a', href=True, text='Verfügbar in CSV-Format')[0]['href']
+    return url
+
+def get_songs(url):
+    r = requests.get(url)
+    return r.text
+
+def is_valid_uuid(val):
+    try:
+        uuid.UUID(str(val))
+        return True
+    except ValueError:
+        return False
+
+def check_config_exists():
+    return os.path.isfile(config_file)
+
+def load_version(app):
+    if os.path.isfile(".version"):
+        with open('.version', 'r') as file:
+            data = file.read().replace('\n', '')
+            if data:
+                app.config['VERSION'] = data
+            else:
+                app.config['VERSION'] = ""
+    else:
+        app.config['VERSION'] = ""
+
+def setup_config(app):
+    if check_config_exists():
+        config = json.load(open(config_file))
+        with open(config_file, 'r') as handle:
+            config = json.load(handle)
+        print("Loaded existing config")
+    else:
+        config = {'username': 'admin', 'password': 'changeme', 'entryquota': 3, 'maxqueue': 20}
+        with open(config_file, 'w') as handle:
+            json.dump(config, handle, indent=4, sort_keys=True)
+        print("Wrote new config")
+    app.config['BASIC_AUTH_USERNAME'] = config['username']
+    app.config['BASIC_AUTH_PASSWORD'] = config['password']
+    app.config['ENTRY_QUOTA'] = config['entryquota']
+    app.config['MAX_QUEUE'] = config['maxqueue']
+
+
+
+def nocache(view):
+    @wraps(view)
+    def no_cache(*args, **kwargs):
+        response = make_response(view(*args, **kwargs))
+        response.headers['Last-Modified'] = datetime.now()
+        response.headers['Cache-Control'] = 'no-store, no-cache, must-revalidate, post-check=0, pre-check=0, max-age=0'
+        response.headers['Pragma'] = 'no-cache'
+        response.headers['Expires'] = '-1'
+        return response
+        
+    return update_wrapper(no_cache, view)