Fix 500 error when trying to migrate to an invalid address (#21462)

* Fix 500 error when trying to migrate to an invalid address

* Add tests

app/models/account_migration.rb

@@ -59,7 +59,7 @@ class AccountMigration < ApplicationRecord
 
   def set_target_account
     self.target_account = ResolveAccountService.new.call(acct, skip_cache: true)
-  rescue Webfinger::Error, HTTP::Error, OpenSSL::SSL::SSLError, Mastodon::Error
+  rescue Webfinger::Error, HTTP::Error, OpenSSL::SSL::SSLError, Mastodon::Error, Addressable::URI::InvalidURIError
     # Validation will take care of it
   end
 

app/models/form/redirect.rb

@@ -32,7 +32,7 @@ class Form::Redirect
 
   def set_target_account
     @target_account = ResolveAccountService.new.call(acct, skip_cache: true)
-  rescue Webfinger::Error, HTTP::Error, OpenSSL::SSL::SSLError, Mastodon::Error
+  rescue Webfinger::Error, HTTP::Error, OpenSSL::SSL::SSLError, Mastodon::Error, Addressable::URI::InvalidURIError
     # Validation will take care of it
   end
 

spec/models/account_migration_spec.rb

@@ -1,5 +1,48 @@
 require 'rails_helper'
 
 RSpec.describe AccountMigration, type: :model do
+  describe 'validations' do
+    let(:source_account) { Fabricate(:account) }
+    let(:target_acct)    { target_account.acct }
 
+    let(:subject) { AccountMigration.new(account: source_account, acct: target_acct) }
+
+    context 'with valid properties' do
+      let(:target_account) { Fabricate(:account, username: 'target', domain: 'remote.org') }
+
+      before do
+        target_account.aliases.create!(acct: source_account.acct)
+
+        service_double = double
+        allow(ResolveAccountService).to receive(:new).and_return(service_double)
+        allow(service_double).to receive(:call).with(target_acct, anything).and_return(target_account)
+      end
+
+      it 'passes validations' do
+        expect(subject).to be_valid
+      end
+    end
+
+    context 'with unresolveable account' do
+      let(:target_acct) { 'target@remote' }
+
+      before do
+        service_double = double
+        allow(ResolveAccountService).to receive(:new).and_return(service_double)
+        allow(service_double).to receive(:call).with(target_acct, anything).and_return(nil)
+      end
+
+      it 'has errors on acct field' do
+        expect(subject).to model_have_error_on_field(:acct)
+      end
+    end
+
+    context 'with a space in the domain part' do
+      let(:target_acct) { 'target@remote. org' }
+
+      it 'has errors on acct field' do
+        expect(subject).to model_have_error_on_field(:acct)
+      end
+    end
+  end
 end