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<title>[50167] trunk: Security: add  Content-Security-Policy script loaders.</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/50167">50167</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/50167","name":"Review Commit"}}</script></dd>
<dt style="float: left; width: 6em; font-weight: bold">Author</dt> <dd>adamsilverstein</dd>
<dt style="float: left; width: 6em; font-weight: bold">Date</dt> <dd>2021-02-02 20:53:53 +0000 (Tue, 02 Feb 2021)</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'>Security: add  Content-Security-Policy script loaders.

Add new functions `wp_get_script_tag`, `wp_print_script_tag`, `wp_print_inline_script_tag` and `wp_get_inline_script_tag` that support script attributes. Enables passing attributes such as `async` or `nonce`, creating a path forward for enabling a Content-Security-Policy in core, plugins and themes.

Props tomdxw, johnbillion, jadeddragoon, jrchamp, mallorydxw, epicfaace, alinod, enricocarraro, ocean90.
Fixes <a href="https://core.trac.wordpress.org/ticket/39941">#39941</a>.</pre>

<h3>Modified Paths</h3>
<ul>
<li><a href="#trunksrcwpincludesfunctionsphp">trunk/src/wp-includes/functions.php</a></li>
</ul>

<h3>Added Paths</h3>
<ul>
<li><a href="#trunktestsphpunittestsfunctionswpInlineScriptTagphp">trunk/tests/phpunit/tests/functions/wpInlineScriptTag.php</a></li>
<li><a href="#trunktestsphpunittestsfunctionswpSanitizeScriptAttributesphp">trunk/tests/phpunit/tests/functions/wpSanitizeScriptAttributes.php</a></li>
<li><a href="#trunktestsphpunittestsfunctionswpScriptTagphp">trunk/tests/phpunit/tests/functions/wpScriptTag.php</a></li>
</ul>

</div>
<div id="patch">
<h3>Diff</h3>
<a id="trunksrcwpincludesfunctionsphp"></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/functions.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/wp-includes/functions.php       2021-02-02 20:46:26 UTC (rev 50166)
+++ trunk/src/wp-includes/functions.php 2021-02-02 20:53:53 UTC (rev 50167)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -7866,3 +7866,123 @@
</span><span class="cx" style="display: block; padding: 0 10px"> function wp_fuzzy_number_match( $expected, $actual, $precision = 1 ) {
</span><span class="cx" style="display: block; padding: 0 10px">        return abs( (float) $expected - (float) $actual ) <= $precision;
</span><span class="cx" style="display: block; padding: 0 10px"> }
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+
+/**
+ * Sanitizes an attributes array into an attributes string to be placed inside a `<script>` tag.
+ *
+ * Automatically injects type attribute if needed.
+ * Used by {@see wp_get_script_tag()} and {@see wp_get_inline_script_tag()}.
+ *
+ * @since 5.7.0
+ *
+ * @param array $attributes Key-value pairs representing `<script>` tag attributes.
+ * @return string String made of sanitized `<script>` tag attributes.
+ */
+function wp_sanitize_script_attributes( $attributes ) {
+       $html5_script_support = ! is_admin() && ! current_theme_supports( 'html5', 'script' );
+       $attributes_string    = '';
+
+       // If HTML5 script tag is supported, only the attribute name is added
+       // to $attributes_string for entries with a boolean value, and that are true.
+       foreach ( $attributes as $attribute_name => $attribute_value ) {
+               if ( is_bool( $attribute_value ) ) {
+                       if ( $attribute_value ) {
+                               $attributes_string .= $html5_script_support ? sprintf( ' %1$s="%2$s"', esc_attr( $attribute_name ), esc_attr( $attribute_name ) ) : ' ' . $attribute_name;
+                       }
+               } else {
+                       $attributes_string .= sprintf( ' %1$s="%2$s"', esc_attr( $attribute_name ), esc_attr( $attribute_value ) );
+               }
+       }
+
+       return $attributes_string;
+}
+
+/**
+ * Formats `<script>` loader tags.
+ *
+ * It is possible to inject attributes in the `<script>` tag via the {@see 'wp_script_attributes'} filter.
+ * Automatically injects type attribute if needed.
+ *
+ * @since 5.7.0
+ *
+ * @param array $attributes Key-value pairs representing `<script>` tag attributes.
+ * @return string String containing `<script>` opening and closing tags.
+ */
+function wp_get_script_tag( $attributes ) {
+       if ( ! isset( $attributes['type'] ) && ! is_admin() && ! current_theme_supports( 'html5', 'script' ) ) {
+               $attributes['type'] = 'text/javascript';
+       }
+       /**
+        * Filters attributes to be added to a script tag.
+        *
+        * @since 5.7.0
+        *
+        * @param array $attributes Key-value pairs representing `<script>` tag attributes.
+        *                          Only the attribute name is added to the `<script>` tag for
+        *                          entries with a boolean value, and that are true.
+        */
+       $attributes = apply_filters( 'wp_script_attributes', $attributes );
+
+       return sprintf( "<script%s></script>\n", wp_sanitize_script_attributes( $attributes ) );
+}
+
+/**
+ * Prints formatted `<script>` loader tag.
+ *
+ * It is possible to inject attributes in the `<script>` tag via the  {@see 'wp_script_attributes'}  filter.
+ * Automatically injects type attribute if needed.
+ *
+ * @since 5.7.0
+ *
+ * @param array $attributes Key-value pairs representing `<script>` tag attributes.
+ */
+function wp_print_script_tag( $attributes ) {
+       echo wp_get_script_tag( $attributes );
+}
+
+/**
+ * Wraps inline JavaScript in `<script>` tag.
+ *
+ * It is possible to inject attributes in the `<script>` tag via the  {@see 'wp_script_attributes'}  filter.
+ * Automatically injects type attribute if needed.
+ *
+ * @since 5.7.0
+ *
+ * @param string $javascript Inline JavaScript code.
+ * @param array  $attributes  Optional. Key-value pairs representing `<script>` tag attributes.
+ * @return string String containing inline JavaScript code wrapped around `<script>` tag.
+ */
+function wp_get_inline_script_tag( $javascript, $attributes = array() ) {
+       if ( ! isset( $attributes['type'] ) && ! is_admin() && ! current_theme_supports( 'html5', 'script' ) ) {
+               $attributes['type'] = 'text/javascript';
+       }
+       /**
+        * Filters attributes to be added to a script tag.
+        *
+        * @since 5.7.0
+        *
+        * @param array $attributes Key-value pairs representing `<script>` tag attributes.
+        *                          Only the attribute name is added to the `<script>` tag for
+        *                          entries with a boolean value, and that are true.
+        */
+       $attributes = apply_filters( 'wp_inline_script_attributes', $attributes, $javascript );
+
+       $javascript = "\n" . trim( $javascript, "\n\r " ) . "\n";
+
+       return sprintf( "<script%s>%s</script>\n", wp_sanitize_script_attributes( $attributes ), $javascript );
+}
+
+/**
+ * Prints inline JavaScript wrapped in `<script>` tag.
+ *
+ * It is possible to inject attributes in the `<script>` tag via the  {@see 'wp_script_attributes'}  filter.
+ * Automatically injects type attribute if needed.
+ *
+ * @since 5.7.0
+ *
+ * @param string $javascript Inline JavaScript code.
+ * @param array  $attributes Optional. Key-value pairs representing `<script>` tag attributes.
+ */
+function wp_print_inline_script_tag( $javascript, $attributes = array() ) {
+       echo wp_get_inline_script_tag( $javascript, $attributes );
+}
</ins></span></pre></div>
<a id="trunktestsphpunittestsfunctionswpInlineScriptTagphp"></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/functions/wpInlineScriptTag.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/tests/phpunit/tests/functions/wpInlineScriptTag.php                         (rev 0)
+++ trunk/tests/phpunit/tests/functions/wpInlineScriptTag.php   2021-02-02 20:53:53 UTC (rev 50167)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -0,0 +1,119 @@
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+<?php
+
+/**
+ * Test wp_get_inline_script_tag() and wp_print_inline_script_tag().
+ *
+ * @group functions.php
+ */
+class Tests_Functions_wpInlineScriptTag extends WP_UnitTestCase {
+
+       private $event_handler = <<<'JS'
+document.addEventListener( 'DOMContentLoaded', function () {
+       document.getElementById( 'elementID' )
+                       .addEventListener( 'click', function( event ) {
+                               event.preventDefault();
+                       });
+});
+JS;
+
+       public function get_inline_script_tag_type_set() {
+               add_theme_support( 'html5', array( 'script' ) );
+
+               $this->assertSame(
+                       '<script type="application/javascript" nomodule>' . "\n{$this->event_handler}\n</script>\n",
+                       wp_get_inline_script_tag(
+                               $this->event_handler,
+                               array(
+                                       'type'     => 'application/javascript',
+                                       'async'    => false,
+                                       'nomodule' => true,
+                               )
+                       )
+               );
+
+               remove_theme_support( 'html5' );
+
+               $this->assertSame(
+                       '<script type="application/javascript" nomodule>' . "\n{$this->event_handler}\n</script>\n",
+                       wp_get_inline_script_tag(
+                               $this->event_handler,
+                               array(
+                                       'type'     => 'application/javascript',
+                                       'async'    => false,
+                                       'nomodule' => true,
+                               )
+                       )
+               );
+       }
+
+       public function test_get_inline_script_tag_type_not_set() {
+               add_theme_support( 'html5', array( 'script' ) );
+
+               $this->assertSame(
+                       "<script nomodule>\n{$this->event_handler}\n</script>\n",
+                       wp_get_inline_script_tag(
+                               $this->event_handler,
+                               array(
+                                       'async'    => false,
+                                       'nomodule' => true,
+                               )
+                       )
+               );
+
+               remove_theme_support( 'html5' );
+       }
+
+       public function test_get_inline_script_tag_unescaped_src() {
+               add_theme_support( 'html5', array( 'script' ) );
+
+               $this->assertSame(
+                       "<script>\n{$this->event_handler}\n</script>\n",
+                       wp_get_inline_script_tag( $this->event_handler )
+               );
+
+               remove_theme_support( 'html5' );
+       }
+
+       public function test_print_script_tag_prints_get_inline_script_tag() {
+               add_filter(
+                       'wp_inline_script_attributes',
+                       function ( $attributes ) {
+                               if ( isset( $attributes['id'] ) && 'utils-js-extra' === $attributes['id'] ) {
+                                       $attributes['async'] = true;
+                               }
+                               return $attributes;
+                       }
+               );
+
+               add_theme_support( 'html5', array( 'script' ) );
+
+               $attributes = array(
+                       'id'       => 'utils-js-before',
+                       'nomodule' => true,
+               );
+
+               $this->assertSame(
+                       wp_get_inline_script_tag( $this->event_handler, $attributes ),
+                       get_echo(
+                               'wp_print_inline_script_tag',
+                               array(
+                                       $this->event_handler,
+                                       $attributes,
+                               )
+                       )
+               );
+
+               remove_theme_support( 'html5' );
+
+               $this->assertSame(
+                       wp_get_inline_script_tag( $this->event_handler, $attributes ),
+                       get_echo(
+                               'wp_print_inline_script_tag',
+                               array(
+                                       $this->event_handler,
+                                       $attributes,
+                               )
+                       )
+               );
+       }
+}
</ins><span class="cx" style="display: block; padding: 0 10px">Property changes on: trunk/tests/phpunit/tests/functions/wpInlineScriptTag.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><a id="trunktestsphpunittestsfunctionswpSanitizeScriptAttributesphp"></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/functions/wpSanitizeScriptAttributes.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/tests/phpunit/tests/functions/wpSanitizeScriptAttributes.php                                (rev 0)
+++ trunk/tests/phpunit/tests/functions/wpSanitizeScriptAttributes.php  2021-02-02 20:53:53 UTC (rev 50167)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -0,0 +1,130 @@
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+<?php
+
+/**
+ * Test wp_sanitize_script_attributes().
+ *
+ * @group functions.php
+ */
+class Tests_Functions_wpSanitizeScriptAttributes extends WP_UnitTestCase {
+
+       function test_sanitize_script_attributes_type_set() {
+               add_theme_support( 'html5', array( 'script' ) );
+
+               $this->assertSame(
+                       ' type="application/javascript" src="https://DOMAIN.TLD/PATH/FILE.js" nomodule',
+                       wp_sanitize_script_attributes(
+                               array(
+                                       'type'     => 'application/javascript',
+                                       'src'      => 'https://DOMAIN.TLD/PATH/FILE.js',
+                                       'async'    => false,
+                                       'nomodule' => true,
+                               )
+                       )
+               );
+
+               remove_theme_support( 'html5' );
+
+               $this->assertSame(
+                       ' src="https://DOMAIN.TLD/PATH/FILE.js" type="application/javascript" nomodule="nomodule"',
+                       wp_sanitize_script_attributes(
+                               array(
+                                       'src'      => 'https://DOMAIN.TLD/PATH/FILE.js',
+                                       'type'     => 'application/javascript',
+                                       'async'    => false,
+                                       'nomodule' => true,
+                               )
+                       )
+               );
+       }
+
+       function test_sanitize_script_attributes_type_not_set() {
+               add_theme_support( 'html5', array( 'script' ) );
+
+               $this->assertSame(
+                       ' src="https://DOMAIN.TLD/PATH/FILE.js" nomodule',
+                       wp_sanitize_script_attributes(
+                               array(
+                                       'src'      => 'https://DOMAIN.TLD/PATH/FILE.js',
+                                       'async'    => false,
+                                       'nomodule' => true,
+                               )
+                       )
+               );
+
+               remove_theme_support( 'html5' );
+
+               $this->assertSame(
+                       ' src="https://DOMAIN.TLD/PATH/FILE.js" nomodule="nomodule"',
+                       wp_sanitize_script_attributes(
+                               array(
+                                       'src'      => 'https://DOMAIN.TLD/PATH/FILE.js',
+                                       'async'    => false,
+                                       'nomodule' => true,
+                               )
+                       )
+               );
+       }
+
+
+       function test_sanitize_script_attributes_no_attributes() {
+               add_theme_support( 'html5', array( 'script' ) );
+
+               $this->assertSame(
+                       '',
+                       wp_sanitize_script_attributes( array() )
+               );
+
+               remove_theme_support( 'html5' );
+       }
+
+       function test_sanitize_script_attributes_relative_src() {
+               add_theme_support( 'html5', array( 'script' ) );
+
+               $this->assertSame(
+                       ' src="PATH/FILE.js" nomodule',
+                       wp_sanitize_script_attributes(
+                               array(
+                                       'src'      => 'PATH/FILE.js',
+                                       'async'    => false,
+                                       'nomodule' => true,
+                               )
+                       )
+               );
+
+               remove_theme_support( 'html5' );
+       }
+
+
+       function test_sanitize_script_attributes_only_false_boolean_attributes() {
+               add_theme_support( 'html5', array( 'script' ) );
+
+               $this->assertSame(
+                       '',
+                       wp_sanitize_script_attributes(
+                               array(
+                                       'async'    => false,
+                                       'nomodule' => false,
+                               )
+                       )
+               );
+
+               remove_theme_support( 'html5' );
+       }
+
+       function test_sanitize_script_attributes_only_true_boolean_attributes() {
+               add_theme_support( 'html5', array( 'script' ) );
+
+               $this->assertSame(
+                       ' async nomodule',
+                       wp_sanitize_script_attributes(
+                               array(
+                                       'async'    => true,
+                                       'nomodule' => true,
+                               )
+                       )
+               );
+
+               remove_theme_support( 'html5' );
+       }
+
+}
</ins><span class="cx" style="display: block; padding: 0 10px">Property changes on: trunk/tests/phpunit/tests/functions/wpSanitizeScriptAttributes.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><a id="trunktestsphpunittestsfunctionswpScriptTagphp"></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/functions/wpScriptTag.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/tests/phpunit/tests/functions/wpScriptTag.php                               (rev 0)
+++ trunk/tests/phpunit/tests/functions/wpScriptTag.php 2021-02-02 20:53:53 UTC (rev 50167)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -0,0 +1,94 @@
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+<?php
+
+/**
+ * Test wp_get_script_tag() and wp_print_script_tag().
+ *
+ * @group functions.php
+ */
+class Tests_Functions_wpScriptTag extends WP_UnitTestCase {
+
+       function get_script_tag_type_set() {
+               add_theme_support( 'html5', array( 'script' ) );
+
+               $this->assertSame(
+                       '<script src="https://localhost/PATH/FILE.js" type="application/javascript" nomodule></script>' . "\n",
+                       wp_get_script_tag(
+                               array(
+                                       'type'     => 'application/javascript',
+                                       'src'      => 'https://localhost/PATH/FILE.js',
+                                       'async'    => false,
+                                       'nomodule' => true,
+                               )
+                       )
+               );
+
+               remove_theme_support( 'html5' );
+
+               $this->assertSame(
+                       '<script src="https://localhost/PATH/FILE.js" type="application/javascript" nomodule></script>' . "\n",
+                       wp_get_script_tag(
+                               array(
+                                       'src'      => 'https://localhost/PATH/FILE.js',
+                                       'type'     => 'application/javascript',
+                                       'async'    => false,
+                                       'nomodule' => true,
+                               )
+                       )
+               );
+       }
+
+       function test_get_script_tag_type_not_set() {
+               add_theme_support( 'html5', array( 'script' ) );
+
+               $this->assertSame(
+                       '<script src="https://localhost/PATH/FILE.js" nomodule></script>' . "\n",
+                       wp_get_script_tag(
+                               array(
+                                       'src'      => 'https://localhost/PATH/FILE.js',
+                                       'async'    => false,
+                                       'nomodule' => true,
+                               )
+                       )
+               );
+
+               remove_theme_support( 'html5' );
+       }
+
+       function test_print_script_tag_prints_get_script_tag() {
+               add_filter(
+                       'wp_script_attributes',
+                       function ( $attributes ) {
+                               if ( isset( $attributes['id'] ) && 'utils-js-extra' === $attributes['id'] ) {
+                                       $attributes['async'] = true;
+                               }
+                               return $attributes;
+                       }
+               );
+
+               add_theme_support( 'html5', array( 'script' ) );
+
+               $attributes = array(
+                       'src'      => 'https://localhost/PATH/FILE.js',
+                       'id'       => 'utils-js-extra',
+                       'nomodule' => true,
+               );
+
+               $this->assertSame(
+                       wp_get_script_tag( $attributes ),
+                       get_echo(
+                               'wp_print_script_tag',
+                               array( $attributes )
+                       )
+               );
+
+               remove_theme_support( 'html5' );
+
+               $this->assertSame(
+                       wp_get_script_tag( $attributes ),
+                       get_echo(
+                               'wp_print_script_tag',
+                               array( $attributes )
+                       )
+               );
+       }
+}
</ins><span class="cx" style="display: block; padding: 0 10px">Property changes on: trunk/tests/phpunit/tests/functions/wpScriptTag.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>

</body>
</html>