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<title>[44023] KSES: Make the URI attributes DRY.</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/44023">44023</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/44023","name":"Review Commit"}}</script></dd>
<dt style="float: left; width: 6em; font-weight: bold">Author</dt> <dd>iandunn</dd>
<dt style="float: left; width: 6em; font-weight: bold">Date</dt> <dd>2018-12-13 00:32:59 +0000 (Thu, 13 Dec 2018)</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'>KSES: Make the URI attributes DRY.
This commit introduces the `wp_kses_uri_attributes` function and filter. The function centralizes the list of attributes, in order to prevent inconsistency, and the filter provides a way for plugins to customize the attributes.
Merges <a href="https://core.trac.wordpress.org/changeset/44014">[44014]</a> and <a href="https://core.trac.wordpress.org/changeset/44017">[44017]</a> to the 4.8 branch.</pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#branches48srcwpincludesksesphp">branches/4.8/src/wp-includes/kses.php</a></li>
</ul>
<h3>Property Changed</h3>
<ul>
<li><a href="#branches48">branches/4.8/</a></li>
</ul>
</div>
<div id="patch">
<h3>Diff</h3>
<span class="cx" style="display: block; padding: 0 10px">Index: branches/4.8
</span><span class="cx" style="display: block; padding: 0 10px">===================================================================
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">--- branches/4.8 2018-12-13 00:27:51 UTC (rev 44022)
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+++ branches/4.8 2018-12-13 00:32:59 UTC (rev 44023)
</ins><a id="branches48"></a>
<div class="propset"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Property changes: branches/4.8</h4>
<pre class="diff"><span>
</span></pre></div>
<a id="svnmergeinfo"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: svn:mergeinfo</h4></div>
<span class="cx" style="display: block; padding: 0 10px"> /branches/3.3:20543
</span><span class="cx" style="display: block; padding: 0 10px"> /branches/3.4:21757
</span><span class="cx" style="display: block; padding: 0 10px"> /branches/4.9:42434
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-/branches/5.0:43988,43994
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+/branches/5.0:43988,43994,44014,44017
</ins><span class="cx" style="display: block; padding: 0 10px"> /trunk:40872-40873,40879,40881,40883,40885,40892-40893,40896-40897,40901,40926-40927,40939,40941,40961,40990-40991,40995,41000,41009,41020,41022,41028,41035,41037,41047,41050,41070,41072,41086,41088,41094,41112,41115-41116,41132,41134,41136,41139,41141,41250-41251,41260,41294,41335,41386,41393,41395,41397-41398,41448,41457,41470,41483,41496,41636,41662,41870,42056,42119-42120,42220,42258-42261,42424,42433,42892-42894
</span><span class="cx" style="display: block; padding: 0 10px">\ No newline at end of property
</span><a id="branches48srcwpincludesksesphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: branches/4.8/src/wp-includes/kses.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- branches/4.8/src/wp-includes/kses.php 2018-12-13 00:27:51 UTC (rev 44022)
+++ branches/4.8/src/wp-includes/kses.php 2018-12-13 00:32:59 UTC (rev 44023)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -536,7 +536,7 @@
</span><span class="cx" style="display: block; padding: 0 10px"> * @return string Filtered attribute.
</span><span class="cx" style="display: block; padding: 0 10px"> */
</span><span class="cx" style="display: block; padding: 0 10px"> function wp_kses_one_attr( $string, $element ) {
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- $uris = array('xmlns', 'profile', 'href', 'src', 'cite', 'classid', 'codebase', 'data', 'usemap', 'longdesc', 'action');
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ $uris = wp_kses_uri_attributes();
</ins><span class="cx" style="display: block; padding: 0 10px"> $allowed_html = wp_kses_allowed_html( 'post' );
</span><span class="cx" style="display: block; padding: 0 10px"> $allowed_protocols = wp_allowed_protocols();
</span><span class="cx" style="display: block; padding: 0 10px"> $string = wp_kses_no_null( $string, array( 'slash_zero' => 'keep' ) );
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -735,6 +735,56 @@
</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">+ * Helper function listing HTML attributes containing a URL.
+ *
+ * This function returns a list of all HTML attributes that must contain
+ * a URL according to the HTML specification.
+ *
+ * This list includes URI attributes both allowed and disallowed by KSES.
+ *
+ * @link https://developer.mozilla.org/en-US/docs/Web/HTML/Attributes
+ *
+ * @since 5.0.1
+ *
+ * @return array HTML attributes that must include a URL.
+ */
+function wp_kses_uri_attributes() {
+ $uri_attributes = array(
+ 'action',
+ 'archive',
+ 'background',
+ 'cite',
+ 'classid',
+ 'codebase',
+ 'data',
+ 'formaction',
+ 'href',
+ 'icon',
+ 'longdesc',
+ 'manifest',
+ 'poster',
+ 'profile',
+ 'src',
+ 'usemap',
+ 'xmlns',
+ );
+
+ /**
+ * Filters the list of attributes that are required to contain a URL.
+ *
+ * Use this filter to add any `data-` attributes that are required to be
+ * validated as a URL.
+ *
+ * @since 5.0.1
+ *
+ * @param array $uri_attributes HTML attributes requiring validation as a URL.
+ */
+ $uri_attributes = apply_filters( 'wp_kses_uri_attributes', $uri_attributes );
+
+ return $uri_attributes;
+}
+
+/**
</ins><span class="cx" style="display: block; padding: 0 10px"> * Callback for wp_kses_split.
</span><span class="cx" style="display: block; padding: 0 10px"> *
</span><span class="cx" style="display: block; padding: 0 10px"> * @since 3.1.0
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -930,7 +980,7 @@
</span><span class="cx" style="display: block; padding: 0 10px"> $attrarr = array();
</span><span class="cx" style="display: block; padding: 0 10px"> $mode = 0;
</span><span class="cx" style="display: block; padding: 0 10px"> $attrname = '';
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- $uris = array('xmlns', 'profile', 'href', 'src', 'cite', 'classid', 'codebase', 'data', 'usemap', 'longdesc', 'action');
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ $uris = wp_kses_uri_attributes();
</ins><span class="cx" style="display: block; padding: 0 10px">
</span><span class="cx" style="display: block; padding: 0 10px"> // Loop through the whole attribute list
</span><span class="cx" style="display: block; padding: 0 10px">
</span></span></pre>
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