[wp-trac] [WordPress Trac] #62043: Allow plugins and themes perform extra checks upon install/upgrade via filter

[WordPress Trac]

#62043: Allow plugins and themes perform extra checks upon install/upgrade via
filter
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 Reporter:  LeonidasMilossis  |      Owner:  (none)
     Type:  enhancement       |     Status:  new
 Priority:  normal            |  Milestone:  Awaiting Review
Component:  Plugins           |    Version:  trunk
 Severity:  normal            |   Keywords:
  Focuses:                    |
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 Currently, if a plugin (or a theme) wants to perform custom checks upon
 plugin install/upgrade, they need to either hook into the existing
 `upgrader_source_selection` filter or extend the `Plugin_Upgrader` class,
 which is suboptimal as it leads to code duplication and/or processes being
 repeated on every install/upgrade.

 Ideally, we can have a more specific filter for more granularity in the
 process.

 For example, say a plugin wants to check against a custom plugin header
 (potentially added via the `extra_plugin_headers` filter). By having a
 filter at the end of the `Plugin_Upgrader::check_package()` (or the
 respective one from `Theme_Upgrader`), after all the core checks have been
 passed, we can allow plugin authors to just add additional checks
 depending on their needs.

 That filter will allow plugins to  hook into it and return a `WP_Error`
 like the checks above it, to prevent installs/upgrade when a custom check
 fails.

 All that would be especially useful for plugin add-ons that require a
 minimum installed version of their main plugin to be active before
 installed/upgraded.

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Ticket URL: <https://core.trac.wordpress.org/ticket/62043>
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