Extract courses to environment variable

app.py

@@ -11,24 +11,10 @@ def hello():
     url = os.environ.get('URL', None)
     if url is None:
         return ""
-    
+
     cal_str = urllib.request.urlopen(url).read()
 
-    FILTERED_EVENTS = [
-        'MGL',
-        'SYD',
-        'SQE',
-        'COM',
-        'RSM',
-        'ANG1',
-        'DLG1',
-        'SPO1',
-        'SPO2',
-        'STA1',
-        'PST',
-        'SEC',
-        'DIA'
-    ]
+    FILTERED_EVENTS = os.environ.get('COURSES', '').split(',')
 
     cal = Component.from_ical(cal_str)
     other = Calendar()