Show an "approval queue" item on the home page for admins, and sort out menu item visibility

Summary:
  - If you're an administrator and there are users waiting for approval, show a count on the home page.
  - Sort out the `isUserActivated()` access check.
  - Hide all the menu widgets except "Logout" for disabled and unapproved users.
  - Add a "Log In" item.
  - Add a bunch of unit tests.

Test Plan: Ran unit tests, clicked around as unapproved/approved/logged-in/logged-out users.

Reviewers: btrahan

Reviewed By: btrahan

CC: aran, chad

Differential Revision: https://secure.phabricator.com/D7574
Implement an approval queue

Summary:
  - Add an option for the queue.
  - By default, enable it.
  - Dump new users into the queue.
  - Send admins an email to approve them.

Test Plan:
  - Registered new accounts with queue on and off.
  - As an admin, approved accounts and disabled the queue from email.

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Differential Revision: https://secure.phabricator.com/D7576
Respect "can edit username" in registration UI

Summary:
Fixes T3741. The flag is respected in terms of actually creating the account, but the UI is a bit unclear.

This can never occur naturally, but installs can register an event which locks it.

Test Plan:
Artificially locked it, verified I got more reasonable UI;

{F81282}

Reviewers: btrahan, datr

Reviewed By: datr

CC: aran

Maniphest Tasks: T3741

Differential Revision: https://secure.phabricator.com/D7577
Fix handle loads in ManiphestTaskListView

Summary:
Fixes T4095. Fixes T3817.

  - The batch editor has some funky handle code which misses projects, share that.
  - Remove some hacks for T3817 that should be good now.

Test Plan: Looked at batch editor, saw projects. Looked at task list.

Reviewers: btrahan

Reviewed By: btrahan

CC: aran, martin.schulz

Maniphest Tasks: T3817, T4095

Differential Revision: https://secure.phabricator.com/D7578
Add `bin/repository edit` for CLI repository editing

Summary:
Ref T4039. This is mostly to deal with that, to prevent the security issues associated with mutable local paths. The next diff will lock them in the web UI.

I also added a confirmation prompt to `bin/repository delete`, which was a little scary without one.

See one comment inline about the `--as` flag. I don't love this, but when I started adding all the stuff we'd need to let this transaction show up as "Administrator" it quickly got pretty big.

Test Plan: Ran `bin/repository edit ...`, saw an edit with a transaction show up on the web UI.

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T4039

Differential Revision: https://secure.phabricator.com/D7579
Prevent Repository local path edit from the web UI

Summary:
Ref T4039. This fixes an issue where a user with the ability to create repositories could view repositories he is otherwise not permitted to see, by following these steps:

  - Suppose you want to see repository "A".
  - Create a repository with the same VCS, called "B".
  - Edit the local path, changing "/var/repo/B" to "/var/repo/A".
  - Now it points at a working copy of a repository you can't see.
  - Although you won't be able to make it through discovery (the pull will fail with the wrong credentials), you can read some information out of the repository directly through the Diffusion UI, probably?

I'm not sure this was really practical to execute since there are a bunch of sanity checks along most/all of the major pathways, but lock it down since normal users shouldn't be editing it anyway. In the best case, this would make a mess.

Test Plan: {F81391}

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T4039

Differential Revision: https://secure.phabricator.com/D7580
Fix new logged-out "Login" button URI and workflowiness

Summary: Whelp apparently I never actually clicked this.

Auditors: btrahan
Cache the computation of the custom block component of the markup key

Summary:
Caught this taking way too long on a production profile:

https://secure.phabricator.com/xhprof/profile/PHID-FILE-vfzq3sregh5xvpf5nc2t/?symbol=PhabricatorMarkupEngine::getMarkupFieldKey

Cache it; it's always identical.

Test Plan: Loaded Conpherence locally.

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Differential Revision: https://secure.phabricator.com/D7583
Land to GitHub + support stuff

Summary:
A usable, Land to GitHub flow.

Still to do:
- Refactor all git/hg stratagies to a sane structure.
- Make the dialogs Workflow + explain why it's disabled.
- Show button and request Link Account if GH is enabled, but user is not linked.
- After refreshing token, user ends up in the settings stage.

Hacked something in LandController to be able to show an arbitrary dialog from a strategy.
It's not very nice, but I want to make some more refactoring to the controller/strategy/ies anyway.

Also made PhabricatorRepository::getRemoteURIObject() public, because it was very useful in getting
the domain and path for the repo.

Test Plan:
Went through these flows:
- load revision in hosted, github-backed, non-github backed repos to see button as needed.
- hit land with weak token - sent to refresh it with the extra scope.
- Land to repo I'm not allowed - got proper error message.
- Successfully landed; Failed to apply patch.

Reviewers: epriestley, #blessed_reviewers

Reviewed By: epriestley

CC: Korvin, epriestley, aran

Maniphest Tasks: T182

Differential Revision: https://secure.phabricator.com/D7555
Add a default "Subscribed" query to Maniphest

Summary: Although I don't want to end up with 20 of these again, this is a reasonable default to provide, particularly for installs where a large portion of the userbase primarily reports bugs and does not interact with them directly.

Test Plan: Hit `/maniphest/`, saw "Subscribed", clicked it, saw the tasks I'm subscribed to.

Reviewers: jbrown, btrahan

Reviewed By: jbrown

CC: aran

Maniphest Tasks: T4100

Differential Revision: https://secure.phabricator.com/D7586
Modified script to commit smaller batches of symbols to the database.

Summary:
Modified the import script so it will only try to load a configurable
number of symbols at a time to avoid exhausting memory for large project
imports.

I haven't written a line of PHP in more than a decade, so please forgive
any stylistic or technical errors.

Test Plan: Ran the script on symbol table generated from linux kernel.

Reviewers: epriestley, #blessed_reviewers

Reviewed By: epriestley

CC: Korvin, epriestley, aran

Maniphest Tasks: T4117

Differential Revision: https://secure.phabricator.com/D7596
Bugfix for D7596

Summary: Fixed a small bug that caused the catch-all commit to purge previously added symbols in that session.

Test Plan: Re-ran the script, observed corrected behavior.

Reviewers: epriestley, #blessed_reviewers

Reviewed By: epriestley

CC: Korvin, epriestley, aran

Maniphest Tasks: T4117

Differential Revision: https://secure.phabricator.com/D7597
Fix DiffusionLintController

Summary: Use proper method Fixes T4118

Test Plan: Test a lint page in Diffusion

Reviewers: epriestley, btrahan, vrana

Reviewed By: epriestley

CC: Korvin, epriestley, aran

Maniphest Tasks: T4118

Differential Revision: https://secure.phabricator.com/D7598
Add "phd.user" with `sudo` hooks for SSH/HTTP writes

Summary:
Ref T2230. When fully set up, we have up to three users who all need to write into the repositories:

  - The webserver needs to write for HTTP receives.
  - The SSH user needs to write for SSH receives.
  - The daemons need to write for "git fetch", "git clone", etc.

These three users don't need to be different, but in practice they are often not likely to all be the same user. If for no other reason, making them all the same user requires you to "git clone httpd@host.com", and installs are likely to prefer "git clone git@host.com".

Using three different users also allows better privilege separation. Particularly, the daemon user can be the //only// user with write access to the repositories. The webserver and SSH user can accomplish their writes through `sudo`, with a whitelisted set of commands. This means that even if you compromise the `ssh` user, you need to find a way to escallate from there to the daemon user in order to, e.g., write arbitrary stuff into the repository or bypass commit hooks.

This lays some of the groundwork for a highly-separated configuration where the SSH and HTTP users have the fewest privileges possible and use `sudo` to interact with repositories. Some future work which might make sense:

  - Make `bin/phd` respect this (require start as the right user, or as root and drop privileges, if this configuration is set).
  - Execute all `git/hg/svn` commands via sudo?

Users aren't expected to configure this yet so I haven't written any documentation.

Test Plan:
Added an SSH user ("dweller") and gave it sudo by adding this to `/etc/sudoers`:

   dweller ALL=(epriestley) SETENV: NOPASSWD: /usr/bin/git-upload-pack, /usr/bin/git-receive-pack

Then I ran git pushes and pulls over SSH via "dweller@localhost". They successfully interacted with the repository on disk as the "epriestley" user.

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T2230

Differential Revision: https://secure.phabricator.com/D7589
Fix meme generation for palette PNGs

Summary: Fixes T4125. Indexed / palette PNGs may fail to allocate a proper black for drawing an image border.

Test Plan: {F83066}

Reviewers: btrahan, asukhachev

Reviewed By: asukhachev

CC: aran

Maniphest Tasks: T4125

Differential Revision: https://secure.phabricator.com/D7604
Set a default paste header

Summary: Fixes T4040

Test Plan: Create new paste without title, see title.

Reviewers: epriestley

Reviewed By: epriestley

CC: Korvin, epriestley, aran

Maniphest Tasks: T4040

Differential Revision: https://secure.phabricator.com/D7605
Never raise policy exceptions for the omnipotent viewer

Summary:
Fixes T4109. If a revision has a bad `repositoryPHID` (for example, because the repository was deleted), `DifferentialRevisionQuery` calls `didRejectResult()` on it, which raises a policy exception, even if the viewer is omnipotent. This aborts the `MessageParser`, because it does not expect policy exceptions to be raised for an omnipotent viewer.

Fix this in two ways:

  # Never raise a policy exception for an omnipotent viewer. I think this is the expected behavior and a reasonable rule.
  # In this case, load the revision for an omnipotent viewer.

This feels a little gross, but it's the only place where we do this in the codebase right now. We can clean this up later on once it's more clear what the circumstances of checks like these are.

Test Plan: Set a revision to have an invalid `repositoryPHID`, ran message parser on it, got a clean parse.

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T4109

Differential Revision: https://secure.phabricator.com/D7603
Cascade DarkConsole query plan analyzer to Ajax requests

Summary: Fixes T4123. If you click "Profile" on a page, we already profile all the ajax requests it generates. Do the same for "Analyze Query Plans".

Test Plan: Viewed a page with Ajax requests using "Analyze Query Plans", and not using "Analyze Query Plans".

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T4123

Differential Revision: https://secure.phabricator.com/D7601
Restore population of `ownerOrdering` to ManiphestTasks

Summary:
Ref T4110. This denormalized field used to power "Group By: Assigned" got dropped in the T2217 migration at some point.

Restore its population, and fix all the data in the database.

Test Plan: Ran migration, verified database came out reasonable-looking. Reassigned a task, verified database. Ran a "Group By: assigned" query.

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T4110

Differential Revision: https://secure.phabricator.com/D7602
Speed up loading of diffs with a lot of unit test failures

Summary:
We've been having trouble with viewing diffs timing out when there's a lot of unit test failures. It was caused by formatting userdata for every single failure. The expensive part of this was actually creating the engine for every result, so moved the construction outside of the loop.

Diffs that timed out (2 min) loading before load in around 6 seconds now.

Test Plan: Loaded diffs that used to time out. Verified that details still looked right when Show Full Unit Test Results Is Clicked.

Reviewers: epriestley, keegancsmith, lifeihuang, #blessed_reviewers

Reviewed By: epriestley

CC: Korvin, epriestley, aran, andrewjcg

Differential Revision: https://secure.phabricator.com/D7581