Merge branch 'master' into glitch-soc/merge-upstream

Conflicts:
- config/locales/en.yml
  Conflict caused by the glitch-soc-specific “flavour” string being too close
  to the newly introduced “identity_proofs” string. Just included both.

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