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<title>[48433] trunk: Formatting: Prevent wp_slash from returning non-strings as strings.</title>
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<dt style="float: left; width: 6em; font-weight: bold">Revision</dt> <dd><a style="font-weight: bold" href="https://core.trac.wordpress.org/changeset/48433">48433</a><script type="application/ld+json">{"@context":"http://schema.org","@type":"EmailMessage","description":"Review this Commit","action":{"@type":"ViewAction","url":"https://core.trac.wordpress.org/changeset/48433","name":"Review Commit"}}</script></dd>
<dt style="float: left; width: 6em; font-weight: bold">Author</dt> <dd>whyisjake</dd>
<dt style="float: left; width: 6em; font-weight: bold">Date</dt> <dd>2020-07-11 00:11:57 +0000 (Sat, 11 Jul 2020)</dd>
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<pre style='padding-left: 1em; margin: 2em 0; border-left: 2px solid #ccc; line-height: 1.25; font-size: 105%; font-family: sans-serif'>Formatting: Prevent wp_slash from returning non-strings as strings.

If a bool/float/int is passed into wp_slash it will be coerced into a string.

This changes the behavior to only slash strings. At the same time, handles recursion a little nicer by calling array_map for arrays.

Fixes <a href="https://core.trac.wordpress.org/ticket/42195">#42195</a>, <a href="https://core.trac.wordpress.org/ticket/24106">#24106</a>.

Props johnbillion, andizer, jrf, ryotasakamoto, SergeyBiryukov, donmhico, TobiasBg, markoheijnen, ryan, nacin, devesine, whyisjake.</pre>

<h3>Modified Paths</h3>
<ul>
<li><a href="#trunksrcwpincludesformattingphp">trunk/src/wp-includes/formatting.php</a></li>
<li><a href="#trunktestsphpunittestsformattingStripSlashesDeepphp">trunk/tests/phpunit/tests/formatting/StripSlashesDeep.php</a></li>
</ul>

<h3>Added Paths</h3>
<ul>
<li><a href="#trunktestsphpunittestsformattingWPSlashphp">trunk/tests/phpunit/tests/formatting/WPSlash.php</a></li>
</ul>

</div>
<div id="patch">
<h3>Diff</h3>
<a id="trunksrcwpincludesformattingphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/src/wp-includes/formatting.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/wp-includes/formatting.php      2020-07-10 23:26:31 UTC (rev 48432)
+++ trunk/src/wp-includes/formatting.php        2020-07-11 00:11:57 UTC (rev 48433)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -5496,12 +5496,13 @@
</span><span class="cx" style="display: block; padding: 0 10px"> }
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px"> /**
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- * Add slashes to a string or array of strings.
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ * Add slashes to a string or array of strings, in a recursive manner.
</ins><span class="cx" style="display: block; padding: 0 10px">  *
</span><span class="cx" style="display: block; padding: 0 10px">  * This should be used when preparing data for core API that expects slashed data.
</span><span class="cx" style="display: block; padding: 0 10px">  * This should not be used to escape data going directly into an SQL query.
</span><span class="cx" style="display: block; padding: 0 10px">  *
</span><span class="cx" style="display: block; padding: 0 10px">  * @since 3.6.0
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ * @since 5.5.0 Leave a non-string value untouched.
</ins><span class="cx" style="display: block; padding: 0 10px">  *
</span><span class="cx" style="display: block; padding: 0 10px">  * @param string|array $value String or array of strings to slash.
</span><span class="cx" style="display: block; padding: 0 10px">  * @return string|array Slashed $value
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -5508,17 +5509,13 @@
</span><span class="cx" style="display: block; padding: 0 10px">  */
</span><span class="cx" style="display: block; padding: 0 10px"> function wp_slash( $value ) {
</span><span class="cx" style="display: block; padding: 0 10px">        if ( is_array( $value ) ) {
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                foreach ( $value as $k => $v ) {
-                       if ( is_array( $v ) ) {
-                               $value[ $k ] = wp_slash( $v );
-                       } else {
-                               $value[ $k ] = addslashes( $v );
-                       }
-               }
-       } else {
-               $value = addslashes( $value );
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+         $value = array_map( 'wp_slash', $value );
</ins><span class="cx" style="display: block; padding: 0 10px">         }
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+        if ( is_string( $value ) ) {
+               return addslashes( $value );
+       }
+
</ins><span class="cx" style="display: block; padding: 0 10px">         return $value;
</span><span class="cx" style="display: block; padding: 0 10px"> }
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span></span></pre></div>
<a id="trunktestsphpunittestsformattingStripSlashesDeepphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/tests/phpunit/tests/formatting/StripSlashesDeep.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/tests/phpunit/tests/formatting/StripSlashesDeep.php 2020-07-10 23:26:31 UTC (rev 48432)
+++ trunk/tests/phpunit/tests/formatting/StripSlashesDeep.php   2020-07-11 00:11:57 UTC (rev 48433)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -2,6 +2,7 @@
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px"> /**
</span><span class="cx" style="display: block; padding: 0 10px">  * @group formatting
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ * @group slashes
</ins><span class="cx" style="display: block; padding: 0 10px">  */
</span><span class="cx" style="display: block; padding: 0 10px"> class Tests_Formatting_StripSlashesDeep extends WP_UnitTestCase {
</span><span class="cx" style="display: block; padding: 0 10px">        /**
</span></span></pre></div>
<a id="trunktestsphpunittestsformattingWPSlashphp"></a>
<div class="addfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Added: trunk/tests/phpunit/tests/formatting/WPSlash.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/tests/phpunit/tests/formatting/WPSlash.php                          (rev 0)
+++ trunk/tests/phpunit/tests/formatting/WPSlash.php    2020-07-11 00:11:57 UTC (rev 48433)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -0,0 +1,103 @@
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+<?php
+
+/**
+ * @group formatting
+ */
+class Tests_Formatting_WPSlash extends WP_UnitTestCase {
+
+       /**
+        * @dataProvider data_wp_slash
+        *
+        * @ticket 42195
+        *
+        * @param string $value
+        * @param string $expected
+        */
+       public function test_wp_slash_with( $value, $expected ) {
+               $this->assertSame( $expected, wp_slash( $value ) );
+       }
+
+       /**
+        * Data provider for test_wp_slash().
+        *
+        * @return array {
+        *     @type array {
+        *         @type mixed  $value    The value passed to wp_slash().
+        *         @type string $expected The expected output of wp_slash().
+        *     }
+        * }
+        */
+       public function data_wp_slash() {
+               return array(
+                       array( 123, 123 ),
+                       array( 123.4, 123.4 ),
+                       array( true, true ),
+                       array( false, false ),
+                       array(
+                               array(
+                                       'hello',
+                                       null,
+                                       '"string"',
+                                       125.41,
+                               ),
+                               array(
+                                       'hello',
+                                       null,
+                                       '\"string\"',
+                                       125.41,
+                               ),
+                       ),
+                       array( "first level 'string'", "first level \'string\'" ),
+               );
+       }
+
+       /**
+        * @ticket 24106
+        */
+       function test_adds_slashes() {
+               $old = "I can't see, isn't that it?";
+               $new = "I can\'t see, isn\'t that it?";
+               $this->assertEquals( $new, wp_slash( $old ) );
+               $this->assertEquals( "I can\\\\\'t see, isn\\\\\'t that it?", wp_slash( $new ) );
+               $this->assertEquals( array( 'a' => $new ), wp_slash( array( 'a' => $old ) ) ); // Keyed array
+               $this->assertEquals( array( $new ), wp_slash( array( $old ) ) ); // Non-keyed
+       }
+
+       /**
+        * @ticket 24106
+        */
+       function test_preserves_original_datatype() {
+
+               $this->assertEquals( true, wp_slash( true ) );
+               $this->assertEquals( false, wp_slash( false ) );
+               $this->assertEquals( 4, wp_slash( 4 ) );
+               $this->assertEquals( 'foo', wp_slash( 'foo' ) );
+               $arr      = array(
+                       'a' => true,
+                       'b' => false,
+                       'c' => 4,
+                       'd' => 'foo',
+               );
+               $arr['e'] = $arr; // Add a sub-array
+               $this->assertEquals( $arr, wp_slash( $arr ) ); // Keyed array
+               $this->assertEquals( array_values( $arr ), wp_slash( array_values( $arr ) ) ); // Non-keyed
+
+               $obj = new stdClass;
+               foreach ( $arr as $k => $v ) {
+                       $obj->$k = $v;
+               }
+               $this->assertEquals( $obj, wp_slash( $obj ) );
+       }
+
+       /**
+        * @ticket 24106
+        */
+       function test_add_even_more_slashes() {
+               $old = 'single\\slash double\\\\slash triple\\\\\\slash';
+               $new = 'single\\\\slash double\\\\\\\\slash triple\\\\\\\\\\\\slash';
+               $this->assertEquals( $new, wp_slash( $old ) );
+               $this->assertEquals( array( 'a' => $new ), wp_slash( array( 'a' => $old ) ) ); // Keyed array
+               $this->assertEquals( array( $new ), wp_slash( array( $old ) ) ); // Non-keyed
+       }
+
+}
</ins><span class="cx" style="display: block; padding: 0 10px">Property changes on: trunk/tests/phpunit/tests/formatting/WPSlash.php
</span><span class="cx" style="display: block; padding: 0 10px">___________________________________________________________________
</span></span></pre></div>
<a id="svneolstyle"></a>
<div class="addfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Added: svn:eol-style</h4></div>
<ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+native
</ins><span class="cx" style="display: block; padding: 0 10px">\ No newline at end of property
</span></div>

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