Add Keybase integration

app/controllers/admin/settings_controller.rb

@@ -27,6 +27,7 @@ class SettingsController < BaseController
       preview_sensitive_media
       custom_css
       profile_directory
+      keybase_contacts
     ).freeze
 
     BOOLEAN_SETTINGS = %w(

app/controllers/api/proofs_controller.rb

@@ -0,0 +1,30 @@
+# frozen_string_literal: true
+
+class Api::ProofsController < Api::BaseController
+  before_action :set_account
+  before_action :set_provider
+  before_action :check_account_approval
+  before_action :check_account_suspension
+
+  def index
+    render json: @account, serializer: @provider.serializer_class
+  end
+
+  private
+
+  def set_provider
+    @provider = ProofProvider.find(params[:provider]) || raise(ActiveRecord::RecordNotFound)
+  end
+
+  def set_account
+    @account = Account.find_local!(params[:username])
+  end
+
+  def check_account_approval
+    not_found if @account.user_pending?
+  end
+
+  def check_account_suspension
+    gone if @account.suspended?
+  end
+end

app/controllers/settings/identity_proofs_controller.rb

@@ -0,0 +1,45 @@
+# frozen_string_literal: true
+
+class Settings::IdentityProofsController < Settings::BaseController
+  layout 'admin'
+
+  before_action :authenticate_user!
+  before_action :check_required_params, only: :new
+
+  def index
+    @proofs = AccountIdentityProof.where(account: current_account).order(provider: :asc, provider_username: :asc)
+    @proofs.each(&:refresh!)
+  end
+
+  def new
+    @proof = current_account.identity_proofs.new(
+      token: params[:token],
+      provider: params[:provider],
+      provider_username: params[:provider_username]
+    )
+
+    render layout: 'auth'
+  end
+
+  def create
+    @proof = current_account.identity_proofs.where(provider: resource_params[:provider], provider_username: resource_params[:provider_username]).first_or_initialize(resource_params)
+    @proof.token = resource_params[:token]
+
+    if @proof.save
+      redirect_to @proof.on_success_path(params[:user_agent])
+    else
+      flash[:alert] = I18n.t('identity_proofs.errors.failed', provider: @proof.provider.capitalize)
+      redirect_to settings_identity_proofs_path
+    end
+  end
+
+  private
+
+  def check_required_params
+    redirect_to settings_identity_proofs_path unless [:provider, :provider_username, :token].all? { |k| params[k].present? }
+  end
+
+  def resource_params
+    params.require(:account_identity_proof).permit(:provider, :provider_username, :token)
+  end
+end

app/controllers/well_known/keybase_proof_config_controller.rb

@@ -0,0 +1,9 @@
+# frozen_string_literal: true
+
+module WellKnown
+  class KeybaseProofConfigController < ActionController::Base
+    def show
+      render json: {}, serializer: ProofProvider::Keybase::ConfigSerializer
+    end
+  end
+end

app/javascript/styles/mastodon/containers.scss

@@ -723,6 +723,20 @@
 
       a {
         color: lighten($ui-highlight-color, 8%);
+
+        &.provider_username {
+          position: relative;
+          top: -7px;
+        }
+
+        &.proof {
+          color: $darker-text-color;
+          display: block;
+          font-size: 12px;
+          position: relative;
+          text-transform: lowercase;
+          top: -11px;
+        }
       }
 
       dl:first-child .verified {

app/javascript/styles/mastodon/forms.scss

@@ -801,3 +801,58 @@ code {
     }
   }
 }
+
+.connection-prompt {
+  margin-bottom: 25px;
+
+  .fa-link {
+    background-color: darken($ui-base-color, 4%);
+    border-radius: 100%;
+    font-size: 24px;
+    padding: 10px;
+  }
+
+  &__column {
+    align-items: center;
+    display: flex;
+    flex: 1;
+    flex-direction: column;
+    flex-shrink: 1;
+
+    &-sep {
+      flex-grow: 0;
+      overflow: visible;
+      position: relative;
+      z-index: 1;
+    }
+  }
+
+  .account__avatar {
+    margin-bottom: 20px;
+  }
+
+  &__connection {
+    background-color: lighten($ui-base-color, 8%);
+    box-shadow: 0 0 15px rgba($base-shadow-color, 0.2);
+    border-radius: 4px;
+    padding: 25px 10px;
+    position: relative;
+    text-align: center;
+
+    &::after {
+      background-color: darken($ui-base-color, 4%);
+      content: '';
+      display: block;
+      height: 100%;
+      left: 50%;
+      position: absolute;
+      width: 1px;
+    }
+  }
+
+  &__row {
+    align-items: center;
+    display: flex;
+    flex-direction: row;
+  }
+}

app/lib/proof_provider.rb

@@ -0,0 +1,12 @@
+# frozen_string_literal: true
+
+module ProofProvider
+  SUPPORTED_PROVIDERS = %w(keybase).freeze
+
+  def self.find(identifier, proof = nil)
+    case identifier
+    when 'keybase'
+      ProofProvider::Keybase.new(proof)
+    end
+  end
+end

app/lib/proof_provider/keybase.rb

@@ -0,0 +1,59 @@
+# frozen_string_literal: true
+
+class ProofProvider::Keybase
+  BASE_URL = 'https://keybase.io'
+
+  class Error < StandardError; end
+
+  class ExpectedProofLiveError < Error; end
+
+  class UnexpectedResponseError < Error; end
+
+  def initialize(proof = nil)
+    @proof = proof
+  end
+
+  def serializer_class
+    ProofProvider::Keybase::Serializer
+  end
+
+  def worker_class
+    ProofProvider::Keybase::Worker
+  end
+
+  def validate!
+    unless @proof.token&.size == 66
+      @proof.errors.add(:base, I18n.t('identity_proofs.errors.keybase.invalid_token'))
+      return
+    end
+
+    return if @proof.provider_username.blank?
+
+    if verifier.valid?
+      @proof.verified = true
+      @proof.live     = false
+    else
+      @proof.errors.add(:base, I18n.t('identity_proofs.errors.keybase.verification_failed', kb_username: @proof.provider_username))
+    end
+  end
+
+  def refresh!
+    worker_class.new.perform(@proof)
+  rescue ProofProvider::Keybase::Error
+    nil
+  end
+
+  def on_success_path(user_agent = nil)
+    verifier.on_success_path(user_agent)
+  end
+
+  def badge
+    @badge ||= ProofProvider::Keybase::Badge.new(@proof.account.username, @proof.provider_username, @proof.token)
+  end
+
+  private
+
+  def verifier
+    @verifier ||= ProofProvider::Keybase::Verifier.new(@proof.account.username, @proof.provider_username, @proof.token)
+  end
+end

app/lib/proof_provider/keybase/badge.rb

@@ -0,0 +1,46 @@
+# frozen_string_literal: true
+
+class ProofProvider::Keybase::Badge
+  include RoutingHelper
+
+  def initialize(local_username, provider_username, token)
+    @local_username    = local_username
+    @provider_username = provider_username
+    @token             = token
+  end
+
+  def proof_url
+    "#{ProofProvider::Keybase::BASE_URL}/#{@provider_username}/sigchain\##{@token}"
+  end
+
+  def profile_url
+    "#{ProofProvider::Keybase::BASE_URL}/#{@provider_username}"
+  end
+
+  def icon_url
+    "#{ProofProvider::Keybase::BASE_URL}/#{@provider_username}/proof_badge/#{@token}?username=#{@local_username}&domain=#{domain}"
+  end
+
+  def avatar_url
+    request = Request.new(:get, "#{ProofProvider::Keybase::BASE_URL}/_/api/1.0/user/pic_url.json", params: { username: @provider_username })
+
+    url = request.perform do |res|
+      json = Oj.load(res.body_with_limit, mode: :strict)
+      json['pic_url'] if json.is_a?(Hash)
+    end
+
+    url || default_avatar_url
+  rescue Oj::ParseError, HTTP::Error, OpenSSL::SSL::SSLError
+    default_avatar_url
+  end
+
+  private
+
+  def default_avatar_url
+    asset_pack_path('media/images/proof_providers/keybase.png')
+  end
+
+  def domain
+    Rails.configuration.x.local_domain
+  end
+end

app/lib/proof_provider/keybase/config_serializer.rb

@@ -0,0 +1,69 @@
+# 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}',
+      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.keybase_contacts.split(',').map(&:strip)
+  end
+end

app/lib/proof_provider/keybase/serializer.rb

@@ -0,0 +1,25 @@
+# frozen_string_literal: true
+
+class ProofProvider::Keybase::Serializer < ActiveModel::Serializer
+  include RoutingHelper
+
+  attribute :avatar
+
+  has_many :identity_proofs, key: :signatures
+
+  def avatar
+    full_asset_url(object.avatar_original_url)
+  end
+
+  class AccountIdentityProofSerializer < ActiveModel::Serializer
+    attributes :sig_hash, :kb_username
+
+    def sig_hash
+      object.token
+    end
+
+    def kb_username
+      object.provider_username
+    end
+  end
+end