From f201c1b2176b87c2798b5146b3245fb179968202 Mon Sep 17 00:00:00 2001
From: whyisjake <whyisjake@git.wordpress.org>
Date: Mon, 1 Jun 2020 18:49:10 +0000
Subject: [PATCH] Canonical: Add the ability to disable
 `redirect_guess_404_permalink()`.

This also adds a few more filters to make adding redirects easier. Notably:

1. `do_redirect_guess_404_permalink`
2. `pre_redirect_guess_404_permalink`
3. `strict_redirect_guess_404_permalink`

Fixes: #16557.
Props: msafi, nacin, simonwheatley, westi, mboynes, joostdevalk, Lex_Robinson, MikeSchinkel, haukep, paulschreiber, DrewAPicture, ravenswd, esemlabel, stevegibson12, martychc23, DrLightman, jivanpal, neonkowy, laternastudio, apedog, audrasjb, davidbaumwald, Confridin, donmhico, ryotsun.


Built from https://develop.svn.wordpress.org/trunk@47878


git-svn-id: http://core.svn.wordpress.org/trunk@47652 1a063a9b-81f0-0310-95a4-ce76da25c4cd
---
 wp-includes/canonical.php | 46 ++++++++++++++++++++++++++++++++++++++-
 wp-includes/version.php   |  2 +-
 2 files changed, 46 insertions(+), 2 deletions(-)

diff --git a/wp-includes/canonical.php b/wp-includes/canonical.php
index f1f41816f0..f4a4337fd2 100644
--- a/wp-includes/canonical.php
+++ b/wp-includes/canonical.php
@@ -835,8 +835,52 @@ function strip_fragment_from_url( $url ) {
 function redirect_guess_404_permalink() {
 	global $wpdb;
 
+	/**
+	 * Filters whether to do redirect guess of 404 requests.
+	 *
+	 * Returning a false value from the filter will disable redirect guess 404 permalink.
+	 * and return early.
+	 *
+	 * @since 5.5.0
+	 *
+	 * @param bool     $do_redirect_guess  Whether to do redirect guess 404 permalink. Default true.
+	 */
+	if ( false === apply_filters( 'do_redirect_guess_404_permalink', true ) ) {
+		return false;
+	}
+
+	/**
+	 * Filters whether to short-circuit redirect guess of 404 requests.
+	 *
+	 * Return a non-false value from the filter will short-circuit the handling and return early.
+	 *
+	 * @since 5.5.0
+	 *
+	 * @param bool     $pre  Whether to short-circuit redirect guess 404 permalink. Default null.
+	 */
+	$pre = apply_filters( 'pre_redirect_guess_404_permalink', null );
+	if ( null !== $pre ) {
+		return $pre;
+	}
+
 	if ( get_query_var( 'name' ) ) {
-		$where = $wpdb->prepare( 'post_name LIKE %s', $wpdb->esc_like( get_query_var( 'name' ) ) . '%' );
+
+		/**
+		 * Filters whether to do a strict or loose guess.
+		 *
+		 * Returning true value from the filter will guess redirect only exact post_name matches.
+		 *
+		 * @since 5.5.0
+		 *
+		 * @param bool     $strict_guess  Whether to do a strict/exact guess. Default false.
+		 */
+		$strict_guess = apply_filters( 'strict_redirect_guess_404_permalink', false );
+
+		if ( $strict_guess ) {
+			$where = $wpdb->prepare( 'post_name = %s', get_query_var( 'name' ) );
+		} else {
+			$where = $wpdb->prepare( 'post_name LIKE %s', $wpdb->esc_like( get_query_var( 'name' ) ) . '%' );
+		}
 
 		// If any of post_type, year, monthnum, or day are set, use them to refine the query.
 		if ( get_query_var( 'post_type' ) ) {
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 47d9c0a98b..c053be25a2 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.5-alpha-47877';
+$wp_version = '5.5-alpha-47878';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.