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General points

• No need to support IE 11

Flask extensions

http://flask.pocoo.org/extensions/

Common stuff

• Flask-Classy, tool to help creating class based views
• Flask-WTF, WTForms for flask. Similar to Django Forms.
• Flask-Gravatar, gravatar images for emails
• Flask-Cache
• Celery for background tasks (async, websocket)

Django like flask service

Need to implement generic tool from simple-payments.helpers.Flask. Example of how that should be used in simple-payments.init

Asset management

???

Authentication and Authorization

Flask-Login

• login_manager.user_loader -> get user and group objects from cache or DB

Flask-Principal

• Provides permission concept
• Should support idea of tree style groups ("provides role 'aalto.cs.letech'")

Flask-Lti-Login

• PyLTI, maybe could be used for LTI related parts
• Flask-Login for user authentication integration
• Flask-Dance, some design ideas could be copied from here. For example, similar to make_github_blueprint(...) we could have make_lti_blueprint.

User Models

• Flask-User, too integrated with password. Separates first and lastname.
• Flask-Security, expect the usermodel to include password authentication, which we are not going to have

Above libs are still probably good sources for examples how to implement Lti-Login in reusable way without database requirements

Real time updates to web UI

Server-Side Events vs. WebSockets

• Flask-SSE for server-side events

Threads? Maximum concurrent streams?