Allow configuring in $wgExternalDatasources in LocalSettings.php data sources with their very nature hidden from wikiuser.
These data sources should be invoked with wiki markup like {{#get_external_data:source=Secret source no. 1}}, with any other parametres, usually passed to {{#get_*_data:}} functions, set in $wgExternalDatasources['Secret source no. 1'].
The wiki admin or author may be unwilling to disclose his external data sources, or the fact that he uses them, or the way they are parsed. This information may either be an asset he doesn't want to share, or too sensitive and potentially leading to DOSing the data source or his being banned from it.
@alex-mashin - okay, that makes sense. For some reason, I was thinking that all the get_..._data functions let you use an ID in place of the source, but actually I think only get_db_data does that. So this seems reasonable - there's no reason for regular users to even know what type of source is being accessed.
Change 825872 had a related patch set uploaded (by Alex Mashin; author: mashin):
[mediawiki/extensions/ExternalData@master] Enable setting up queries to discreet data sources
Change 825872 merged by jenkins-bot:
[mediawiki/extensions/ExternalData@master] Enable setting up queries to discreet data sources
Change 826958 had a related patch set uploaded (by Alex Mashin; author: mashin):
[mediawiki/extensions/ExternalData@master] Further improvements to the obscure data sources
Change 826958 merged by jenkins-bot:
[mediawiki/extensions/ExternalData@master] Further improvements to the obscure data sources
Change 828483 had a related patch set uploaded (by Alex Mashin; author: mashin):
[mediawiki/extensions/ExternalData@master] Further improvements to obscure data sources
Change 828483 merged by jenkins-bot:
[mediawiki/extensions/ExternalData@master] Further improvements to hidden data sources
Change 829845 had a related patch set uploaded (by Alex Mashin; author: mashin):
[mediawiki/extensions/ExternalData@master] Suppress errors for hidden data sources
Change 829845 merged by jenkins-bot:
[mediawiki/extensions/ExternalData@master] Suppress errors for hidden data sources