3 files changed, 55 insertions, 25 deletions
diff --git a/app/models/form/challenge.rb b/app/models/form/challenge.rb
new file mode 100644
index 000000000..40c99649c
--- /dev/null
+++ b/app/models/form/challenge.rb
@@ -0,0 +1,8 @@
+# frozen_string_literal: true
+
+class Form::Challenge
+  include ActiveModel::Model
+
+  attr_accessor :current_password, :current_username,
+                :return_to
+end
diff --git a/app/models/form/migration.rb b/app/models/form/migration.rb
deleted file mode 100644
index c2a8655e1..000000000
--- a/app/models/form/migration.rb
+++ /dev/null
@@ -1,25 +0,0 @@
-# frozen_string_literal: true
-
-class Form::Migration
-  include ActiveModel::Validations
-
-  attr_accessor :acct, :account
-
-  def initialize(attrs = {})
-    @account = attrs[:account]
-    @acct    = attrs[:account].acct unless @account.nil?
-    @acct    = attrs[:acct].gsub(/\A@/, '').strip unless attrs[:acct].nil?
-  end
-
-  def valid?
-    return false unless super
-    set_account
-    errors.empty?
-  end
-
-  private
-
-  def set_account
-    self.account = (ResolveAccountService.new.call(acct) if account.nil? && acct.present?)
-  end
-end
diff --git a/app/models/form/redirect.rb b/app/models/form/redirect.rb
new file mode 100644
index 000000000..a7961f8e8
--- /dev/null
+++ b/app/models/form/redirect.rb
@@ -0,0 +1,47 @@
+# frozen_string_literal: true
+
+class Form::Redirect
+  include ActiveModel::Model
+
+  attr_accessor :account, :target_account, :current_password,
+                :current_username
+
+  attr_reader :acct
+
+  validates :acct, presence: true, domain: { acct: true }
+  validate :validate_target_account
+
+  def valid_with_challenge?(current_user)
+    if current_user.encrypted_password.present?
+      errors.add(:current_password, :invalid) unless current_user.valid_password?(current_password)
+    else
+      errors.add(:current_username, :invalid) unless account.username == current_username
+    end
+
+    return false unless errors.empty?
+
+    set_target_account
+    valid?
+  end
+
+  def acct=(val)
+    @acct = val.to_s.strip.gsub(/\A@/, '')
+  end
+
+  private
+
+  def set_target_account
+    @target_account = ResolveAccountService.new.call(acct)
+  rescue Goldfinger::Error, HTTP::Error, OpenSSL::SSL::SSLError, Mastodon::Error
+    # Validation will take care of it
+  end
+
+  def validate_target_account
+    if target_account.nil?
+      errors.add(:acct, I18n.t('migrations.errors.not_found'))
+    else
+      errors.add(:acct, I18n.t('migrations.errors.already_moved')) if account.moved_to_account_id.present? && account.moved_to_account_id == target_account.id
+      errors.add(:acct, I18n.t('migrations.errors.move_to_self')) if account.id == target_account.id
+    end
+  end
+end