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Security: add Content-Security-Policy script loaders.

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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 #39941.



Built from https://develop.svn.wordpress.org/trunk@50167


git-svn-id: http://core.svn.wordpress.org/trunk@49846 1a063a9b-81f0-0310-95a4-ce76da25c4cd
This commit is contained in:
Adam Silverstein 2021-02-02 20:55:05 +00:00
parent d9cb5af64e
commit a506e02edd
2 changed files with 121 additions and 1 deletions
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120
wp-includes/functions.php
View File

@ -7866,3 +7866,123 @@ function is_php_version_compatible( $required ) {
function wp_fuzzy_number_match( $expected, $actual, $precision = 1 ) {
return abs( (float) $expected - (float) $actual ) <= $precision;
}
/**
* 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 );
}

2
wp-includes/version.php
View File

@ -13,7 +13,7 @@
*
* @global string $wp_version
*/
$wp_version = '5.7-alpha-50166';
$wp_version = '5.7-alpha-50167';
/**
* Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.