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Add missing test data

file test.png was initially added on branch oacs-5-10.

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    ./test/data/test.png
Documentation changes

Use a microseconds resolution to store the proctoring artifacts

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Replace private with public api

Basic test of the proctoring upload endpoint

Implement a pre-selection filter for timeframes, which can be extended using downstream specific logics

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Improve upgrade:

- make output more visible when executed in the apm

- when atjobs are available, schedule the upgrade to run in the background at the next restart

Provide an api to delete proctoring artifacts together with their folder in order to reduce duplication

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    ./test/proctoring-test-procs.tcl
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Fix typo in doc

Fix typo in doc

Provide an api to store proctoring artifacts, and a callback hook for postprocessing

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    ./test/proctoring-test-procs.tcl
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file apm-callback-procs.tcl was initially added on branch oacs-5-10.

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    ./apm-callback-procs.tcl
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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Merge if conditions

Improve doc

Fix typical last minute mistake

Proctoring enforcing reform:

so far, to proctor applications that do not have a "single point of entry", such as e.g. dotlrn communities, we have integrated the lib/proctoring-enforce include into the website master template. Now we improve from this by introducing a callback mechanism that allows the single packages to decide if a request is "theirs to be proctored" or not.

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file proctoring-callback-procs.tcl was initially added on branch oacs-5-10.

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    ./proctoring-callback-procs.tcl
Fix typo

improve spelling

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Update doc

Prefer returning forbidden, unauthorized actually asks for authentication

Fix typo

Safe Exam Browser support reform:

- capture both RequestHash and ConfigKeyHash from the request headers and use both to validate the request. This enables to choose to just enforce the plain conf, instead of the whole conf+binaries combination, which is platform-specific

- support storing multiple keys, required e.g. to support multiple platform-specific keys

- make suppling of the config file optional

- extend automated tests to cover new features

- clanup redundant index

- return config file using its stored filename

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Correct hash challenging:

actually, the hash sent by the browser changes based on the requested URL, so it does not make sense to set it directly.

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Make sure the file is downloaded with a .seb extension

file safe-exam-browser-procs.tcl was initially added on branch oacs-5-10.

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    ./safe-exam-browser-procs.tcl
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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Make test more robust when re-running