Add Additional filters to Press This

3 new filters that aim to improve the extensibility of Press This:
1) `press_this_save_post_content` - Applied right after the side_load_images in order to allow potential side loads of other types of media.
Example use case: side load non-image media, such as audio or video.

2) `press_this_useful_html_elements`
Allows filtering of currently hard coded array of HTML elements allowed in fetch_source_html step for special cases where additional HTML elements need to be kept.
Example use case: HTML5 elements, such as amp-img, that someone wants to pull in.

3) `press_this_suggested_content`
A filter for the content right before it's passed to the editor and presented to the user.
Example use case is when someone stored posts in a different, non-HTML format, such as Markdown, this is essential.

Fixes #34455.
Props cadeyrn, kraftbj


Built from https://develop.svn.wordpress.org/trunk@36672


git-svn-id: http://core.svn.wordpress.org/trunk@36639 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/includes/class-wp-press-this.php

@@ -91,7 +91,7 @@ class WP_Press_This {
 			}
 		}
 
-		// Edxpected slashed
+		// Expected slashed
 		return wp_slash( $content );
 	}
 
@@ -133,6 +133,17 @@ class WP_Press_This {
 
 		$post['post_content'] = $this->side_load_images( $post_id, $post['post_content'] );
 
+		/**
+		 * Filter the post_content of a Press This post before saving/updating, after
+		 * side_load_images action had run.
+		 *
+		 * @since 4.5.0
+		 *
+		 * @param string $content Content after side_load_images process.
+		 * @param int    $post_id Post ID.
+		 */
+		$post['post_content'] = apply_filters( 'press_this_save_post_content', $post['post_content'], $post_id );
+
 		$updated = wp_update_post( $post, true );
 
 		if ( is_wp_error( $updated ) ) {
@@ -293,6 +304,15 @@ class WP_Press_This {
 			)
 		);
 
+		/**
+		 * Filter 'useful' HTML elements list for fetch source step.
+		 *
+		 * @since 4.5.0
+		 *
+		 * @param array $elements Default list of useful elements.
+		 */
+		$useful_html_elements = apply_filter( 'press_this_useful_html_elements', $useful_html_elements );
+
 		$source_content = wp_remote_retrieve_body( $remote_url );
 		$source_content = wp_kses( $source_content, $useful_html_elements );
 
@@ -1193,6 +1213,15 @@ class WP_Press_This {
 			}
 		}
 
+		/**
+		 * Filter the assembled HTML for the Press This editor.
+		 *
+		 * @since 4.5.0
+		 *
+		 * @param string $content Assembled end output of suggested content for the Press This editor.
+		 */
+		$content = apply_filters( 'press_this_suggested_content', $content );
+
 		return $content;
 	}
 

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.5-alpha-36671';
+$wp_version = '4.5-alpha-36672';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.