add new config switched for the global scale architecture

[schiessle]

Introduce two config switches:

• gs.enabled, default is false, if it is set to true the server runs in a global scale setup
• 'gs.federation', default is 'internal'. This means that federation is only used within the global scale setup. If you run a global scale setup and want to allow federation with outside you need to set it to 'global'

Rationals:

• in a global scale setup it doesn't make sense to let user update the lookup server or to verify their accounts. The lookup server will be maintained by the admin.
• It makes sense to restrict federation to the internal nodes of a global scale architecture by default.

cc @MorrisJobke@oparoz

[mention-bot]

@schiessle, thanks for your PR! By analyzing the history of the files in this pull request, we identified @MorrisJobke, @j-ed and @LukasReschke to be potential reviewers.

[codecov]

Codecov Report

Merging #5084 into master will decrease coverage by 22.85%.
The diff coverage is 40.54%.

@@ Coverage Diff @@## master #5084 +/- ##
=============================================
- Coverage 54.15% 31.29% -22.86% - Complexity 22286 22293 +7 
=============================================
Files 1379 1380 +1 Lines 85338 84780 -558 Branches 1322 1322 =============================================
- Hits 46214 26532 -19682 - Misses 39124 58248 +19124

Impacted Files	Coverage Δ	Complexity Δ
.../federatedfilesharing/templates/settings-admin.php	0% <ø> (ø)	0 <0> (ø)	⬇️
apps/federatedfilesharing/settings-personal.php	0% <ø> (ø)	0 <0> (ø)	⬇️
settings/personal.php	0% <0%> (ø)	0 <0> (ø)	⬇️
config/config.sample.php	0% <0%> (ø)	0 <0> (ø)	⬇️
...ederatedfilesharing/lib/FederatedShareProvider.php	0% <0%> (-66.26%)	84 <0> (+4)
...s/federatedfilesharing/lib/AppInfo/Application.php	0% <0%> (-93.55%)	6 <0> (ø)
lib/private/Share20/ProviderFactory.php	0% <0%> (-84.62%)	29 <0> (ø)
apps/federatedfilesharing/lib/Settings/Admin.php	87.5% <100%> (+1.78%)	4 <1> (ø)	⬇️
lib/private/GlobalScale/Config.php	100% <100%> (ø)	4 <4> (?)
...e/AppFramework/DependencyInjection/DIContainer.php	67.32% <100%> (-17.77%)	25 <0> (ø)
... and 375 more

[schiessle]

@MorrisJobke@oparoz please test and review if this matches your expectation regarding the personal page and the admin settings.

[MorrisJobke]

@MorrisJobke@oparoz please test and review if this matches your expectation regarding the personal page and the admin settings.

Earliest in 1 week, but what you described sounded good.

[ArtificialOwl]

I have a strange issue when switching to your branch:

Downgrading is not supported and is likely to cause unpredictable issues (from 13.0.0.0 to 12.0.0.28)

[schiessle]

Tests passed... ready for final review 😃

[schiessle]

since @daita told me that he tested it successfully I will count this as the second positive review and merge it...

[blizzz]

One thing that should be documented, otherwise its confusing for admins:

lookupServerEnabled and lookupServerUploadEnabled are ignored when GS is enabled.

incoming_server2server_share_enabled and outgoing_server2server_share_enabled are only ignored if GS is internal mode.

[MorrisJobke]

@schiessle when I set following:

	'gs.enabled' => true,
'gs.federation' => 'internal',

What else happens beside that the input fields on the personal page are gone?