Initial code

Procfile

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+web: python app.py

app.py

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+from flask import Flask
+import urllib.request
+from icalendar.cal import Calendar, Component
+
+app = Flask(__name__)
+
+
+@app.route("/")
+def hello():
+    cal_str = urllib.request.urlopen(
+        "***REMOVED***").read()
+
+    FILTERED_EVENTS = [
+        'MGL',
+        'SYD',
+        'SQE',
+        'COM',
+        'RSM',
+        'ANG1',
+        'DLG',
+        'SPO',
+        'STA1',
+        'PST',
+        'SEC',
+        'DIA'
+    ]
+
+    cal = Component.from_ical(cal_str)
+    other = Calendar()
+
+    # Copy all properties of calendar
+    for k, v in cal.items():
+        other.add(k, v)
+
+    # Copy the VTIMEZONE component
+    other.add_component(cal.walk('VTIMEZONE')[0])
+
+    # Filter and copy VEVENTs
+    for ev in cal.walk('VEVENT'):
+        course_code = ev['SUMMARY'].split('-')[1].split('/')[0]
+        if course_code not in FILTERED_EVENTS:
+            other.add_component(ev)
+
+    return other.to_ical().replace(b'\r\n', b'\n').strip()
+
+if __name__ == "__main__":
+    app.run()

requirements.txt

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+click==6.6
+Flask==0.11.1
+icalendar==3.10
+itsdangerous==0.24
+Jinja2==2.8
+MarkupSafe==0.23
+python-dateutil==2.5.3
+pytz==2016.6.1
+six==1.10.0
+Werkzeug==0.11.11

runtime.txt

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+python-3.5.2