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<title>[32403] branches/4.0: WPDB: When sanity checking query character sets, there's no need to check queries that don't return user data.</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/32403">32403</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/32403","name":"Review Commit"}}</script></dd>
<dt style="float: left; width: 6em; font-weight: bold">Author</dt> <dd>ocean90</dd>
<dt style="float: left; width: 6em; font-weight: bold">Date</dt> <dd>2015-05-06 20:03:22 +0000 (Wed, 06 May 2015)</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'>WPDB: When sanity checking query character sets, there's no need to check queries that don't return user data.

Merges <a href="https://core.trac.wordpress.org/changeset/32374">[32374]</a> to the 4.0 branch.

props pento.
see <a href="https://core.trac.wordpress.org/ticket/32104">#32104</a>.</pre>

<h3>Modified Paths</h3>
<ul>
<li><a href="#branches40srcwpincludeswpdbphp">branches/4.0/src/wp-includes/wp-db.php</a></li>
<li><a href="#branches40testsphpunittestsdbcharsetphp">branches/4.0/tests/phpunit/tests/db/charset.php</a></li>
</ul>

</div>
<div id="patch">
<h3>Diff</h3>
<a id="branches40srcwpincludeswpdbphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: branches/4.0/src/wp-includes/wp-db.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- branches/4.0/src/wp-includes/wp-db.php    2015-05-06 20:01:59 UTC (rev 32402)
+++ branches/4.0/src/wp-includes/wp-db.php      2015-05-06 20:03:22 UTC (rev 32403)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -2501,7 +2501,7 @@
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">                // We don't need to check the collation for queries that don't read data.
</span><span class="cx" style="display: block; padding: 0 10px">                $query = ltrim( $query, "\r\n\t (" );
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                if ( preg_match( '/^(?:SHOW|DESCRIBE|DESC|EXPLAIN)\s/i', $query ) ) {
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+         if ( preg_match( '/^(?:SHOW|DESCRIBE|DESC|EXPLAIN|CREATE)\s/i', $query ) ) {
</ins><span class="cx" style="display: block; padding: 0 10px">                         return true;
</span><span class="cx" style="display: block; padding: 0 10px">                }
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -2712,6 +2712,12 @@
</span><span class="cx" style="display: block; padding: 0 10px">         * @return string|WP_Error The converted query, or a {@see WP_Error} object if the conversion fails.
</span><span class="cx" style="display: block; padding: 0 10px">         */
</span><span class="cx" style="display: block; padding: 0 10px">        protected function strip_invalid_text_from_query( $query ) {
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                // We don't need to check the collation for queries that don't read data.
+               $trimmed_query = ltrim( $query, "\r\n\t (" );
+               if ( preg_match( '/^(?:SHOW|DESCRIBE|DESC|EXPLAIN|CREATE)\s/i', $trimmed_query ) ) {
+                       return $query;
+               }
+
</ins><span class="cx" style="display: block; padding: 0 10px">                 $table = $this->get_table_from_query( $query );
</span><span class="cx" style="display: block; padding: 0 10px">                if ( $table ) {
</span><span class="cx" style="display: block; padding: 0 10px">                        $charset = $this->get_table_charset( $table );
</span></span></pre></div>
<a id="branches40testsphpunittestsdbcharsetphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: branches/4.0/tests/phpunit/tests/db/charset.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- branches/4.0/tests/phpunit/tests/db/charset.php   2015-05-06 20:01:59 UTC (rev 32402)
+++ branches/4.0/tests/phpunit/tests/db/charset.php     2015-05-06 20:03:22 UTC (rev 32403)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -639,6 +639,38 @@
</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><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+         * @ticket 32104
+        */
+       function data_dont_strip_text_from_schema_queries() {
+               // An obviously invalid and fake table name.
+               $table_name = "\xff\xff\xff\xff";
+
+               $queries = array(
+                       "SHOW CREATE TABLE $table_name",
+                       "DESCRIBE $table_name",
+                       "DESC $table_name",
+                       "EXPLAIN SELECT * FROM $table_name",
+                       "CREATE $table_name( a VARCHAR(100))",
+               );
+
+               foreach ( $queries as &$query ) {
+                       $query = array( $query );
+               }
+               unset( $query );
+
+               return $queries;
+       }
+
+       /**
+        * @dataProvider data_dont_strip_text_from_schema_queries
+        * @ticket 32104
+        */
+       function test_dont_strip_text_from_schema_queries( $query ) {
+               $return = self::$_wpdb->strip_invalid_text_from_query( $query );
+               $this->assertEquals( $query, $return );
+       }
+
+       /**
</ins><span class="cx" style="display: block; padding: 0 10px">          * @ticket 21212
</span><span class="cx" style="display: block; padding: 0 10px">         */
</span><span class="cx" style="display: block; padding: 0 10px">        function test_invalid_characters_in_query() {
</span></span></pre>
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