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.. _private engines:
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============================
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Private Engines (``tokens``)
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============================
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Administrators might find themselves wanting to limit access to some of the
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enabled engines on their instances. It might be because they do not want to
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expose some private information through :ref:`offline engines`. Or they would
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rather share engines only with their trusted friends or colleagues.
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To solve this issue the concept of *private engines* exists.
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A new option was added to engines named `tokens`. It expects a list of
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strings. If the user making a request presents one of the tokens of an engine,
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they can access information about the engine and make search requests.
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Example configuration to restrict access to the Arch Linux Wiki engine:
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.. code:: yaml
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- name: arch linux wiki
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engine: archlinux
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shortcut: al
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tokens: [ 'my-secret-token' ]
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Unless a user has configured the right token, the engine is going
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to be hidden from him/her. It is not going to be included in the
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list of engines on the Preferences page and in the output of
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`/config` REST API call.
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Tokens can be added to one's configuration on the Preferences page
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under "Engine tokens". The input expects a comma separated list of
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strings.
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The distribution of the tokens from the administrator to the users
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is not carved in stone. As providing access to such engines
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implies that the admin knows and trusts the user, we do not see
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necessary to come up with a strict process. Instead,
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we would like to add guidelines to the documentation of the feature.
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Acknowledgment
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==============
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This development was sponsored by `Search and Discovery Fund
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<https://nlnet.nl/discovery>`_ of `NLnet Foundation <https://nlnet.nl/>`_.
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