Fix #4093

* Fix contexts not being dynamically included

Fixes #11649

* Refactor Note context in serializer

* Refactor Actor serializer

The reason for unattaching media instead of removing it is to support
delete & redraft functionality, but remote or staff-removed statuses
will never be redrafted, so the media should be deleted immediately

* Add more accurate hashtag search

Using ElasticSearch to index hashtags with edge n-grams and score
them by usage within the last 7 days since last activity. Only
hashtags that have been reviewed and are listable can appear in
searches, unless they match the query exactly

* Fix search analyzer dropping non-ascii characters

* Add more accurate account search

When ElasticSearch is available, a more accurate search is implemented:

- Using edge n-gram index for acct and display name
- Using asciifolding and cjk width normalization on display names
- Using Gaussian decay on account activity for additional scoring (recency)
- Using followers/friends ratio for additional scoring (spamminess)
- Using followers number for additional scoring (size)

The exact match precedence only takes effect when the input conforms
to the username format and the username part of it is complete, i.e.
when the user started typing the domain part.

* Support single-letter usernames

* Fix tests

* Fix not picking up account updates

* Add weights and normalization for scores, skip zero terms queries

* Use local counts for accounts index, adjust search parameters

* Fix mistakes

* Using updated_at of accounts is inadequate for remote accounts

* Add database columns for adding notes to domain blocks/restrctions

* Add admin UI to set private and public comments when blocking a domain

* Add text for private and public comments on domain blocks

* Show domain block comments in admin UI

* Add comments to the domain block undo page

* Make UnblockDomainService more robust regarding upgraded domain blocks

* Allow editing domain blocks

* Rename button from “undo domain block” to “view domain block” in account admin UI

* Change test to unsilence silenced users from upgraded blocks

* Bump faker from 1.9.6 to 2.1.0

Bumps [faker](https://github.com/stympy/faker) from 1.9.6 to 2.1.0.
- [Release notes](https://github.com/stympy/faker/releases)
- [Changelog](https://github.com/stympy/faker/blob/master/CHANGELOG.md)
- [Commits](https://github.com/stympy/faker/compare/1.9.6...v2.1.0

)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

* Use faker api v2

https://github.com/stympy/faker/releases/tag/2.0

Fix #271

Add back the `GET /api/v1/trends` API with the caveat that it does
not return tags that have not been allowed to trend by the staff.

When a hashtag begins to trend (internally) and that hashtag has
not been previously reviewed by the staff, the staff is notified.

The new admin UI for hashtags allows filtering hashtags by where
they are used (e.g. in the profile directory), whether they have
been reviewed or are pending reviewal, they show by how many people
the hashtag is used in the directory, how many people used it
today, how many statuses with it have been created today, and it
allows fixing the name of the hashtag to make it more readable.

The disallowed hashtags feature has been reworked. It is now
controlled from the admin UI for hashtags instead of from
the file `config/settings.yml`

Fix #11453

* Change hashtag search to only return results that have trended in the past

A way to eliminate typos and other one-off "junk" results

* Fix excluding exact matches that don't have a score

* Fix tests

* Fix boosting & unboosting preventing a boost from appearing in the TL

* Add tests

* Avoids side effects when aggregate_reblogs isn't true

Fix #11428

This reverts commit 75f7f993.

It is not part of ActivityPub and will free up a lot of space

* Disable invite links from disabled/suspended users

* Add has_many invites relationship to users

* Destroy unused invites when suspending an account

* Check to make sure usernames with '.' cannot be created

* Add test for instance actor account name conflicts

This makes sure that migration 20190715164535_add_instance_actor
won't fail if there's already an account that is named the same
as the domain (minus the .)

* Put the test into the correct context...

* Add another test to split this into two validations

* Don't delete periods when validating username uniqueness (#11392)

The 20190715164535_add_instance_actor migration fails if there's
already a username similar to the domain name, e.g. if you are
'vulpine.club' and have a user named 'vulpineclub', validation
fails.

Upon further review, usernames with periods are dropped by the
regular expression in the Account class, so we don't need to
worry about it here.

Fixes #11392

Allow access to account settings, 2FA, authorized applications, and
account deletions to unconfirmed and pending users, as well as
users who had their accounts disabled. Suspended users cannot update
their e-mail or password or delete their account.

Display account status on account settings page, for example, when
an account is frozen, limited, unconfirmed or pending review.

After sign up, login users straight away and show a simple page that
tells them the status of their account with links to account settings
and logout, to reduce onboarding friction and allow users to correct
wrongly typed e-mail addresses.

Move the final sign-up step of SSO integrations to be the same
as above to reduce code duplication.

* Play animated custom emoji on hover in status

* Play animated custom emoji on hover in display names

* Play animated custom emoji on hover in bios/bio fields

* Add support for animation on hover on public pages emojis too

* Fix tests

* Code style cleanup

Fix #6462

* Add spec covering numeric-only hashtags

* Fix hashtag regex

* Add test

* Fix code for sanitizing nested lists stripping all tags

* Add support for an instance actor

* Skip username validation for local Application accounts

* Add migration script to create instance actor

* Make Codeclimate happy

* Switch to id -99 for instance actor

* Remove unused `icon` and `image` attributes from instance actor

* Use if/elsif/else instead of return + ternary operator

* Add instance actor to fresh installs

* Use instance actor as instance representative

Use instance actor for forwarding reports, relay operations, and spam
auto-reporting.

* Seed database in test environment

* Fix single-user mode

* Fix tests

* Fix specs to accomodate for an extra `Account`

* Auto-reject follows on instance actor

Following an instance actor might make sense, but we are not handling that
right now, so auto-reject.

* Fix webfinger lookup and serialization for instance actor

* Rename instance actor

* Make it clear in the HTML view that the instance actor should not be blocked

* Raise cache time for instance actor as there's no dynamic content

* Re-use /about/more with a flash message for instance actor profile

Fix #10934

* Add a spam check

* Use Nilsimsa to generate locality-sensitive hashes and compare using Levenshtein distance

* Add more tests

* Add exemption when the message is a reply to something that mentions the sender

* Use Nilsimsa Compare Value instead of Levenshtein distance

* Use MD5 for messages shorter than 10 characters

* Add message to automated report, do not add non-public statuses to
automated report, add trust level to accounts and make unsilencing
raise the trust level to prevent repeated spam checks on that account

* Expire spam check data after 3 months

* Add support for local statuses, reduce expiration to 1 week, always create a report

* Add content warnings to the spam check and exempt empty statuses

* Change Nilsimsa threshold to 95 and make sure removed statuses are removed from the spam check

* Add all matched statuses into automatic report

* Add HTTP signature requirement for served ActivityPub resources

* Change `SECURE_MODE` to `AUTHORIZED_FETCH`

* Add 'Signature' to 'Vary' header and improve code style

* Improve code style by adding `public_fetch_mode?` method