Add jetpack_account_protection_send_auth_email filter to allow custom email handling

Add a filter in Email_Service::api_send_auth_email() that fires before
the WPCOM API call, allowing sites to handle the verification email
locally (e.g. via wp_mail()). When the filter returns truthy, the API
call is skipped. Default behavior is unchanged.

Fixes #47999

Author: yaswanthkumar1995

projects/packages/account-protection/changelog/add-send-auth-email-filter

@@ -0,0 +1,4 @@
+Significance: minor
+Type: added
+
+Add `jetpack_account_protection_send_auth_email` filter to allow custom handling of the verification email.

projects/packages/account-protection/src/class-email-service.php

@@ -44,6 +44,25 @@ public function __construct(
 	public function api_send_auth_email( int $user_id, string $auth_code ) {
 		$blog_id = Jetpack_Options::get_option( 'id' );
 
+		/**
+		 * Filters whether the Account Protection verification email should be handled externally.
+		 *
+		 * When the filter returns a truthy value, the default WPCOM API email send is skipped,
+		 * allowing sites to deliver the email locally (e.g. via `wp_mail()`).
+		 *
+		 * @since $$next-version$$
+		 *
+		 * @param bool   $handled  Whether the email has been handled. Default false.
+		 * @param int    $user_id  The user ID.
+		 * @param string $auth_code The authentication code.
+		 * @param int    $blog_id  The blog ID, or false if not available.
+		 */
+		$handled = apply_filters( 'jetpack_account_protection_send_auth_email', false, $user_id, $auth_code, $blog_id );
+
+		if ( $handled ) {
+			return true;
+		}
+
 		if ( ! $blog_id || ! $this->connection_manager->is_connected() ) {
 			return new \WP_Error( 'jetpack_connection_error', __( 'Jetpack is not connected. Please connect and try again.', 'jetpack-account-protection' ) );
 		}

projects/packages/account-protection/tests/php/Email_Service_Test.php

@@ -79,6 +79,50 @@ public function test_resend_auth_mail_sends_mail_and_remembers_2fa_token_success
 		$this->assertMatchesRegularExpression( '/^[0-9]{6}$/', $new_transient['auth_code'], 'Auth code should be 6 digits.' );
 	}
 
+	public function test_api_send_auth_email_skips_api_call_when_filter_returns_truthy(): void {
+		$sut      = new Email_Service();
+		$user     = new \WP_User();
+		$user->ID = 1;
+
+		$filter_args = null;
+		$callback    = function ( $handled, $user_id, $auth_code, $blog_id ) use ( &$filter_args ) {
+			$filter_args = compact( 'handled', 'user_id', 'auth_code', 'blog_id' );
+			return true;
+		};
+
+		add_filter( 'jetpack_account_protection_send_auth_email', $callback, 10, 4 );
+
+		$result = $sut->api_send_auth_email( $user->ID, '123456' );
+
+		remove_filter( 'jetpack_account_protection_send_auth_email', $callback, 10 );
+
+		$this->assertTrue( $result, 'api_send_auth_email should return true when the filter short-circuits.' );
+		$this->assertFalse( $filter_args['handled'], 'Default handled value should be false.' );
+		$this->assertSame( 1, $filter_args['user_id'], 'Filter should receive the user ID.' );
+		$this->assertSame( '123456', $filter_args['auth_code'], 'Filter should receive the auth code.' );
+	}
+
+	public function test_api_send_auth_email_proceeds_normally_when_filter_returns_falsy(): void {
+		Jetpack_Options::delete_option( 'id' );
+		$sut      = new Email_Service();
+		$user     = new \WP_User();
+		$user->ID = 1;
+
+		$callback = function () {
+			return false;
+		};
+
+		add_filter( 'jetpack_account_protection_send_auth_email', $callback, 10, 4 );
+
+		$result = $sut->api_send_auth_email( $user->ID, '123456' );
+
+		remove_filter( 'jetpack_account_protection_send_auth_email', $callback, 10 );
+
+		// Should continue to the normal flow and fail because blog_id is not set
+		$this->assertInstanceOf( \WP_Error::class, $result );
+		$this->assertEquals( 'jetpack_connection_error', $result->get_error_code() );
+	}
+
 	public function test_api_send_auth_email_returns_error_if_blog_id_not_available(): void {
 		Jetpack_Options::delete_option( 'id' );
 		$sut      = new Email_Service();