Introduce new wpl_iframe_src filter to enable filtering arguments t…

…o Likes iframes. (#40276)

* Introduce new `wpl_iframe_src` filter to enable filtering arguments to like iframes.

This will enable experimenting with re-introducing `slim` likeboxes to display likes without gravatars and other future changes.  Could also enable testing grounds of new changes before full UI for setting management is built out, or potentially to point more easily to a testing sandbox.

Companion to proposed changes WPCOM-side via phab diff D165404

* Add changelog.

I had to do a minor change to package.json locally to get pnpm to install -- `"pnpm": "^9.3.0 <9.15.0"` but it worked.

* Update projects/plugins/jetpack/modules/likes/jetpack-likes-master-iframe.php

Co-authored-by: Jeremy Herve <jeremy@jeremy.hu>

* Update filter names to new patterns

---------

Co-authored-by: Jeremy Herve <jeremy@jeremy.hu>

projects/plugins/jetpack/changelog/update-likes-add-iframe-filter

@@ -0,0 +1,4 @@
+Significance: minor
+Type: other
+
+Likes: Add a filter to the iframe url to enable future expansion and modularity.

projects/plugins/jetpack/modules/likes.php

@@ -448,6 +448,9 @@ function_exists( '\Activitypub\is_activitypub_request' )
 
 		$title = esc_html__( 'Like or Reblog', 'jetpack' );
 
+		/** This filter is documented in modules/likes/jetpack-likes-master-iframe.php */
+		$src = apply_filters( 'jetpack_likes_iframe_src', $src );
+
 		$html  = "<div class='sharedaddy sd-block sd-like jetpack-likes-widget-wrapper jetpack-likes-widget-unloaded' id='$wrapper' data-src='$src' data-name='$name' data-title='$title'>";
 		$html .= $headline;
 		$html .= "<div class='likes-widget-placeholder post-likes-widget-placeholder' style='height: 55px;'><span class='button'><span>" . esc_html__( 'Like', 'jetpack' ) . '</span></span> <span class="loading">' . esc_html__( 'Loading...', 'jetpack' ) . '</span></div>';

projects/plugins/jetpack/modules/likes/jetpack-likes-master-iframe.php

@@ -34,6 +34,17 @@ function jetpack_likes_master_iframe() {
 		$new_layout
 	);
 
+	/**
+	 * Filters the Likes iframe src, if any parameters need to be overridden or tracked.
+	 *
+	 * @module likes
+	 *
+	 * @since $$next-version$$
+	 *
+	 * @param string URL to https://widgets.wp.com/ with various arguments appended to the get string and fragment.
+	 */
+	$src = apply_filters( 'jetpack_likes_iframe_src', $src );
+
 	if ( $new_layout ) {
 		// The span content is replaced by queuehandler when showOtherGravatars is called.
 		$likers_text = wp_kses( '<span>%d</span>', array( 'span' => array() ) );