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Introduce a data model for "proctoring artifacts", aka the pictures

and audios, which so far have only lived as files in the filesystem

named after a convention

The new datamodel allows to quickly and reliably retrieve the pictures

collected by proctoring and also provides for a technical space, in

form of a JSON metadata column, to store additional information coming

from e.g. postprocessing phases.

The idea is to use this feature to provide reviewing tools of proctoring results and allow for flexile downstream postprocessing.

The file naming convention has not been changed for the time being, so this would be

retro-compatible. However, integrators should start relying on the new

data model to retrieve pictures.

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Basic backend support for Safe Exam Browser (https://safeexambrowser.org/):

via the API is possible to associate a Safe Exam Browser configuration and its validation key to

the proctored object. The proctored page will then take care of enforcing that, if the safe exam

browser is in use, the supplied request header matches with the configuration and the URL.

When such match fails, we now return the configuration file to the browser, so that users can

open it and restart their session properly configured.

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An own package for proctoring support.

What is there

- adp includes implementing the main proctoring user interaction: desired page can be enclosed in an iframe that will send shaphots taken from browser's camera and microphone at random intervals. Various options can be specified, including custom UI messages and the include can be integrated in custom pages or as part xowiki/xowf object methods

- wizard-based step-by-step configuration of user's setup

- english and german localization

- default proctoring upload endpoints upon package mount

- configuration data-model and api

What is missing

- reporting UI includes (porting from downstream should come shortly)

- some message key is WU specific (but can be customized)

- further parameters/customization

- ...

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file proctoring-support-drop.sql was initially added on branch oacs-5-10.

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    ./proctoring-support-drop.sql