Add $wgForceHTTPS. When set to true:
* It makes the HTTP to HTTPS redirect unconditional and suppresses the
forceHTTPS cookie.
* It makes session cookies be secure.
* In the Action API, it triggers the existing deprecation warning and
avoids more expensive user/session checks.
* In login and signup, it suppresses the old hidden form fields for
protocol switching.
* It hides the prefershttps user preference.
Other changes:
* Factor out the HTTPS redirect in MediaWiki::main() into
maybeDoHttpsRedirect() and shouldDoHttpRedirect(). Improve
documentation.
* User::requiresHTTPS() reflects $wgForceHTTPS whereas the Session
concept of "force HTTPS" does not. The documentation of
User::requiresHTTPS() says that it includes configuration, and
retaining this definition was beneficial for some callers. Whereas
Session::shouldForceHTTPS() was used fairly narrowly as the value
of the forceHTTPS cookie, and injecting configuration into it is not
so easy or beneficial, so I left it as it was, except for clarifying
the documentation.
* Deprecate the following hooks: BeforeHttpsRedirect, UserRequiresHTTPS,
CanIPUseHTTPS. No known extension uses them, and they're not compatible
with the long-term goal of ending support for mixed-protocol wikis.
BeforeHttpsRedirect was documented as unstable from its inception.
CanIPUseHTTPS was a WMF config hack now superseded by GFOC's SNI
sniffing.
* For tests which failed with $wgForceHTTPS=true, I mostly split the
tests, testing each configuration value separately.
* Add ArrayUtils::cartesianProduct() as a helper for generating
combinations of boolean options in the session tests.
Bug: T256095
Change-Id: Iefb5ba55af35350dfc7c050f9fb8f4e8a79751cb
c75eef91bf