Feature: Allow staff to change user emails (#7074)

* Admin: Show unconfirmed email address on account page

* Admin: Allow staff to change user email addresses

* ActionLog: On change_email, log current email address and new unconfirmed email address

7 files changed, 74 insertions, 2 deletions

diff --git a/app/controllers/admin/change_emails_controller.rb b/app/controllers/admin/change_emails_controller.rb
new file mode 100644
index 000000000..a689d3a53
--- /dev/null
+++ b/app/controllers/admin/change_emails_controller.rb
@@ -0,0 +1,49 @@
+# frozen_string_literal: true
+
+module Admin
+  class ChangeEmailsController < BaseController
+    before_action :set_account
+    before_action :require_local_account!
+
+    def show
+      authorize @user, :change_email?
+    end
+
+    def update
+      authorize @user, :change_email?
+
+      new_email = resource_params.fetch(:unconfirmed_email)
+
+      if new_email != @user.email
+        @user.update!(
+          unconfirmed_email: new_email,
+          # Regenerate the confirmation token:
+          confirmation_token: nil
+        )
+
+        log_action :change_email, @user
+
+        @user.send_confirmation_instructions
+      end
+
+      redirect_to admin_account_path(@account.id), notice: I18n.t('admin.accounts.change_email.changed_msg')
+    end
+
+    private
+
+    def set_account
+      @account = Account.find(params[:account_id])
+      @user = @account.user
+    end
+
+    def require_local_account!
+      redirect_to admin_account_path(@account.id) unless @account.local? && @account.user.present?
+    end
+
+    def resource_params
+      params.require(:user).permit(
+        :unconfirmed_email
+      )
+    end
+  end
+end
diff --git a/app/helpers/admin/action_logs_helper.rb b/app/helpers/admin/action_logs_helper.rb
index 7c26c0b05..4c663211e 100644
--- a/app/helpers/admin/action_logs_helper.rb
+++ b/app/helpers/admin/action_logs_helper.rb
@@ -45,6 +45,8 @@ module Admin::ActionLogsHelper
       log.recorded_changes.slice('domain', 'visible_in_picker')
     elsif log.target_type == 'User' && [:promote, :demote].include?(log.action)
       log.recorded_changes.slice('moderator', 'admin')
+    elsif log.target_type == 'User' && [:change_email].include?(log.action)
+      log.recorded_changes.slice('email', 'unconfirmed_email')
     elsif log.target_type == 'DomainBlock'
       log.recorded_changes.slice('severity', 'reject_media')
     elsif log.target_type == 'Status' && log.action == :update
@@ -84,7 +86,7 @@ module Admin::ActionLogsHelper
       'positive'
     when :create
       opposite_verbs?(log) ? 'negative' : 'positive'
-    when :update, :reset_password, :disable_2fa, :memorialize
+    when :update, :reset_password, :disable_2fa, :memorialize, :change_email
       'neutral'
     when :demote, :silence, :disable, :suspend, :remove_avatar, :reopen
       'negative'
diff --git a/app/models/account.rb b/app/models/account.rb
index 446144a3e..51304fc18 100644
--- a/app/models/account.rb
+++ b/app/models/account.rb
@@ -124,6 +124,7 @@ class Account < ApplicationRecord
   scope :matches_domain, ->(value) { where(arel_table[:domain].matches("%#{value}%")) }
 
   delegate :email,
+           :unconfirmed_email,
            :current_sign_in_ip,
            :current_sign_in_at,
            :confirmed?,
diff --git a/app/models/admin/action_log.rb b/app/models/admin/action_log.rb
index c437c8ee8..81f278e07 100644
--- a/app/models/admin/action_log.rb
+++ b/app/models/admin/action_log.rb
@@ -35,6 +35,11 @@ class Admin::ActionLog < ApplicationRecord
       self.recorded_changes = target.attributes
     when :update, :promote, :demote
       self.recorded_changes = target.previous_changes
+    when :change_email
+      self.recorded_changes = ActiveSupport::HashWithIndifferentAccess.new(
+        email: [target.email, nil],
+        unconfirmed_email: [nil, target.unconfirmed_email]
+      )
     end
   end
 end
diff --git a/app/policies/user_policy.rb b/app/policies/user_policy.rb
index aae207d06..dabdf707a 100644
--- a/app/policies/user_policy.rb
+++ b/app/policies/user_policy.rb
@@ -5,6 +5,10 @@ class UserPolicy < ApplicationPolicy
     staff? && !record.staff?
   end
 
+  def change_email?
+    staff? && !record.staff?
+  end
+
   def disable_2fa?
     admin? && !record.staff?
   end
diff --git a/app/views/admin/accounts/show.html.haml b/app/views/admin/accounts/show.html.haml
index fecfd6cc8..7312618ee 100644
--- a/app/views/admin/accounts/show.html.haml
+++ b/app/views/admin/accounts/show.html.haml
@@ -36,9 +36,13 @@
           %th= t('admin.accounts.email')
           %td
             = @account.user_email
-
             - if @account.user_confirmed?
               = fa_icon('check')
+            = table_link_to 'edit', t('admin.accounts.change_email.label'), admin_account_change_email_path(@account.id) if can?(:change_email, @account.user)
+        - if @account.user_unconfirmed_email.present?
+          %th= t('admin.accounts.unconfirmed_email')
+          %td
+            = @account.user_unconfirmed_email
         %tr
           %th= t('admin.accounts.login_status')
           %td
diff --git a/app/views/admin/change_emails/show.html.haml b/app/views/admin/change_emails/show.html.haml
new file mode 100644
index 000000000..a661b1ad6
--- /dev/null
+++ b/app/views/admin/change_emails/show.html.haml
@@ -0,0 +1,7 @@
+- content_for :page_title do
+  = t('admin.accounts.change_email.title', username: @account.acct)
+
+= simple_form_for @user, url: admin_account_change_email_path(@account.id) do |f|
+  = f.input :email, wrapper: :with_label, disabled: true, label: t('admin.accounts.change_email.current_email')
+  = f.input :unconfirmed_email, wrapper: :with_label, label: t('admin.accounts.change_email.new_email')
+  = f.button :submit, class: "button", value: t('admin.accounts.change_email.submit')