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							==================================
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							Limit access to your searx engines
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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 an offline engine. Or they
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							would rather share engines only with their trusted friends or colleagues.
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							Private engines
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							===============
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							To solve this issue private engines were introduced in :pull:`1823`.
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							A new option was added to engines named `tokens`. It expects a list
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							of strings. If the user making a request presents one of the tokens
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							of an engine, he/she is able to access information about the engine
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							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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							Next steps
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							==========
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							Now that searx has support for both offline engines and private engines,
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							it is possible to add concrete engines which benefit from these features.
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							For example engines which search on the local host running the instance.
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							Be it searching your file system or querying a private database. Be creative
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							and come up with new solutions which fit your use case.
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							Acknowledgement
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							===============
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							This development was sponsored by `Search and Discovery Fund`_ of `NLnet Foundation`_ .
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							.. _Search and Discovery Fund: https://nlnet.nl/discovery
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							.. _NLnet Foundation: https://nlnet.nl/
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							| Happy hacking.
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							| kvch // 2020.02.28 22:26
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