Add Keybase integration (#10297)

* create account_identity_proofs table

* add endpoint for keybase to check local proofs

* add async task to update validity and liveness of proofs from keybase

* first pass keybase proof CRUD

* second pass keybase proof creation

* clean up proof list and add badges

* add avatar url to keybase api

* Always highlight the “Identity Proofs” navigation item when interacting with proofs.

* Update translations.

* Add profile URL.

* Reorder proofs.

* Add proofs to bio.

* Update settings/identity_proofs front-end.

* Use `link_to`.

* Only encode query params if they exist.

URLs without params had a trailing `?`.

* Only show live proofs.

* change valid to active in proof list and update liveness before displaying

* minor fixes

* add keybase config at well-known path

* extremely naive feature flagging off the identity proof UI

* fixes for rubocop

* make identity proofs page resilient to potential keybase issues

* normalize i18n

* tweaks for brakeman

* remove two unused translations

* cleanup and add more localizations

* make keybase_contacts an admin setting

* fix ExternalProofService my_domain

* use Addressable::URI in identity proofs

* use active model serializer for keybase proof config

* more cleanup of keybase proof config

* rename proof is_valid and is_live to proof_valid and proof_live

* cleanup

* assorted tweaks for more robust communication with keybase

* Clean up

* Small fixes

* Display verified identity identically to verified links

* Clean up unused CSS

* Add caching for Keybase avatar URLs

* Remove keybase_contacts setting

app/lib/proof_provider/keybase/config_serializer.rb

@@ -0,0 +1,70 @@
+# frozen_string_literal: true
+
+class ProofProvider::Keybase::ConfigSerializer < ActiveModel::Serializer
+  include RoutingHelper
+
+  attributes :version, :domain, :display_name, :username,
+             :brand_color, :logo, :description, :prefill_url,
+             :profile_url, :check_url, :check_path, :avatar_path,
+             :contact
+
+  def version
+    1
+  end
+
+  def domain
+    Rails.configuration.x.local_domain
+  end
+
+  def display_name
+    Setting.site_title
+  end
+
+  def logo
+    { svg_black: full_asset_url(asset_pack_path('media/images/logo_transparent_black.svg')), svg_full: full_asset_url(asset_pack_path('media/images/logo.svg')) }
+  end
+
+  def brand_color
+    '#282c37'
+  end
+
+  def description
+    Setting.site_short_description.presence || Setting.site_description.presence || I18n.t('about.about_mastodon_html')
+  end
+
+  def username
+    { min: 1, max: 30, re: Account::USERNAME_RE.inspect }
+  end
+
+  def prefill_url
+    params = {
+      provider: 'keybase',
+      token: '%{sig_hash}',
+      provider_username: '%{kb_username}',
+      username: '%{username}',
+      user_agent: '%{kb_ua}',
+    }
+
+    CGI.unescape(new_settings_identity_proof_url(params))
+  end
+
+  def profile_url
+    CGI.unescape(short_account_url('%{username}')) # rubocop:disable Style/FormatStringToken
+  end
+
+  def check_url
+    CGI.unescape(api_proofs_url(username: '%{username}', provider: 'keybase'))
+  end
+
+  def check_path
+    ['signatures']
+  end
+
+  def avatar_path
+    ['avatar']
+  end
+
+  def contact
+    [Setting.site_contact_email.presence].compact
+  end
+end