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Editing: jetpack-likes-settings.php

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<?php

class Jetpack_Likes_Settings {
	function __construct() {
		$this->in_jetpack = ! ( defined( 'IS_WPCOM' ) && IS_WPCOM );
	}

/**
	 * Replaces the "Sharing" title for the post screen metabox with "Likes and Shares"
	 */
	public function add_likes_to_sharing_meta_box_title() {
		return __( 'Likes and Shares', 'jetpack' );
	}

/**
	 * Adds a metabox to the post screen if the sharing one doesn't currently exist.
	 */
	public function add_meta_box() {
		if (
			/**
			 * Allow disabling of the Likes metabox on the post editor screen.
			 *
			 * @module likes
			 *
			 * @since 2.2.0
			 *
			 * @param bool false Should the Likes metabox be disabled? Default to false.
			 */
		apply_filters( 'post_flair_disable', false )
		) {
			return;
		}

$post_types = get_post_types( array( 'public' => true ) );
		/**
		 * Filters the Likes metabox title.
		 *
		 * @module likes
		 *
		 * @since 2.2.0
		 *
		 * @param string Likes metabox title. Default to "Likes".
		 */
		$title = apply_filters( 'likes_meta_box_title', __( 'Likes', 'jetpack' ) );
		foreach( $post_types as $post_type ) {
			add_meta_box( 'likes_meta', $title, array( $this, 'meta_box_content' ), $post_type, 'advanced', 'high' );
		}
	}

/**
	 * Shows the likes option in the post screen metabox.
	 */
	public function meta_box_content( $post ) {
		$post_id = ! empty( $post->ID ) ? (int) $post->ID : get_the_ID();
		$checked         = true;
		$disabled        = ! $this->is_enabled_sitewide();
		$switched_status = get_post_meta( $post_id, 'switch_like_status', true );

if ( $disabled && empty( $switched_status ) || false == $disabled && !empty( $switched_status ) )
			$checked = false;

/**
		 * Fires before the Likes meta box content in the post editor.
		 *
		 * @module likes
		 *
		 * @since 2.2.0
		 *
		 * @param WP_Post|array|null $post Post data.
		 */
		do_action( 'start_likes_meta_box_content', $post );
		?>

<p>
			<label for="wpl_enable_post_likes">
				<input type="checkbox" name="wpl_enable_post_likes" id="wpl_enable_post_likes" value="1" <?php checked( $checked ); ?>>
				<?php esc_html_e( 'Show likes.', 'jetpack' ); ?>
			</label>
			<input type="hidden" name="wpl_like_status_hidden" value="1" />
		</p> <?php
		/**
		 * Fires after the Likes meta box content in the post editor.
		 *
		 * @module likes
		 *
		 * @since 2.2.0
		 *
		 * @param WP_Post|array|null $post Post data.
		 */
		do_action( 'end_likes_meta_box_content', $post );
	}

/**
	 * Returns the current state of the "WordPress.com Likes are" option.
	 * @return boolean true if enabled sitewide, false if not
	 */
	public function is_enabled_sitewide() {
		/**
		 * Filters whether Likes are enabled by default on all posts.
		 * true if enabled sitewide, false if not.
		 *
		 * @module likes
		 *
		 * @since 2.2.0
		 *
		 * @param bool $option Are Likes enabled sitewide.
		 */
		return (bool) apply_filters( 'wpl_is_enabled_sitewide', ! Jetpack_Options::get_option_and_ensure_autoload( 'disabled_likes', 0 ) );
	}

public function meta_box_save( $post_id ) {
		if ( defined('DOING_AUTOSAVE') && DOING_AUTOSAVE ) {
			return $post_id;
		}

if ( empty( $_POST['wpl_like_status_hidden'] ) ) {
			return $post_id;
		}

// Record sharing disable. Only needs to be done for WPCOM
		if ( ! $this->in_jetpack ) {
			if ( isset( $_POST['post_type'] ) && in_array( $_POST['post_type'], get_post_types( array( 'public' => true ) ) ) ) {
				if ( ! isset( $_POST['wpl_enable_post_sharing'] ) ) {
					update_post_meta( $post_id, 'sharing_disabled', 1 );
				} else {
					delete_post_meta( $post_id, 'sharing_disabled' );
				}
			}
		}

if ( 'post' == $_POST['post_type'] ) {
			if ( !current_user_can( 'edit_post', $post_id ) ) {
				return $post_id;
			}
		}

// Record a change in like status for this post - only if it contradicts the
		// site like setting.
		if ( ( $this->is_enabled_sitewide() && empty( $_POST['wpl_enable_post_likes'] ) ) || ( ! $this->is_enabled_sitewide() && ! empty( $_POST['wpl_enable_post_likes'] ) ) ) {
			update_post_meta( $post_id, 'switch_like_status', 1 );
		} else {
			delete_post_meta( $post_id, 'switch_like_status' );
		}

return $post_id;
	}

/**
	 * Adds the 'sharing' menu to the settings menu.
	 * Only ran if sharedaddy and publicize are not already active.
	 */
	function sharing_menu() {
		add_submenu_page( 'options-general.php', esc_html__( 'Sharing Settings', 'jetpack' ), esc_html__( 'Sharing', 'jetpack' ), 'manage_options', 'sharing', array( $this, 'sharing_page' ) );
	}

/**
	 * Provides a sharing page with the sharing_global_options hook
	 * so we can display the setting.
	 * Only ran if sharedaddy and publicize are not already active.
	 */
	function sharing_page() {
		$this->updated_message(); ?>
		<div class="wrap">
			<div class="icon32" id="icon-options-general"><br /></div>
			<h1><?php esc_html_e( 'Sharing Settings', 'jetpack' ); ?></h1>
			<?php
			/** This action is documented in modules/sharedaddy/sharing.php */
			do_action( 'pre_admin_screen_sharing' );
			?>
			<?php $this->sharing_block(); ?>
		</div> <?php
	}

/**
	 * Returns the settings have been saved message.
	 */
	function updated_message() {
		if ( isset( $_GET['update'] ) && $_GET['update'] == 'saved' ){
			echo '<div class="updated"><p>' . esc_html__( 'Settings have been saved', 'jetpack' ) . '</p></div>';
		}
	}

/**
	 * Returns just the "sharing buttons" w/ like option block, so it can be inserted into different sharing page contexts
	 */
	function sharing_block() { ?>
		<h2><?php esc_html_e( 'Sharing Buttons', 'jetpack' ); ?></h2>
		<form method="post" action="">
			<table class="form-table">
				<tbody>
				<?php
				/** This action is documented in modules/sharedaddy/sharing.php */
				do_action( 'sharing_global_options' );
				?>
				</tbody>
			</table>

<input type="hidden" name="_wpnonce" value="<?php echo wp_create_nonce( 'sharing-options' );?>" />
		</form> <?php
	}

/**
	 * Are likes enabled for this post?
	 *
	 * @param int $post_id
	 * @return bool
	 */
	function is_post_likeable( $post_id = 0 ) {
		$post = get_post( $post_id );
		if ( !$post || is_wp_error( $post ) ) {
			return false;
		}

$sitewide_likes_enabled = (bool) $this->is_enabled_sitewide();
		$post_likes_switched    = (bool) get_post_meta( $post->ID, 'switch_like_status', true );

return $post_likes_switched xor $sitewide_likes_enabled;
	}

/**
	 * Are likes visible in this context?
	 *
	 * Some of this code was taken and modified from sharing_display() to ensure
	 * similar logic and filters apply here, too.
	 */
	function is_likes_visible() {
		require_once JETPACK__PLUGIN_DIR . '/sync/class.jetpack-sync-settings.php';
		if ( Jetpack_Sync_Settings::is_syncing() ) {
			return false;
		}

global $wp_current_filter; // Used to apply 'sharing_show' filter

$post = get_post();

// Never show on feeds or previews
		if ( is_feed() || is_preview() ) {
			$enabled = false;

// Not a feed or preview, so what is it?
		} else {

if ( in_the_loop() ) {
				// If in the loop, check if the current post is likeable
				$enabled = $this->is_post_likeable();
			} else {
				// Otherwise, check and see if likes are enabled sitewide
				$enabled = $this->is_enabled_sitewide();
			}

if ( post_password_required() )
				$enabled = false;

if ( in_array( 'get_the_excerpt', (array) $wp_current_filter ) ) {
				$enabled = false;
			}

// Sharing Setting Overrides ****************************************

// Single post including custom post types
			if ( is_single() ) {
				if ( ! $this->is_single_post_enabled( $post->post_type ) ) {
					$enabled = false;
				}

// Single page
			} elseif ( is_page() && ! is_front_page() ) {
				if ( ! $this->is_single_page_enabled() ) {
					$enabled = false;
				}

// Attachment
			} elseif ( is_attachment() ) {
				if ( ! $this->is_attachment_enabled() ) {
					$enabled = false;
				}

// All other loops
			} elseif ( ! $this->is_index_enabled() ) {
				$enabled = false;
			}
		}

if ( $post instanceof WP_Post ) {
			// Check that the post is a public, published post.
			if ( 'attachment' == $post->post_type ) {
				$post_status = get_post_status( $post->post_parent );
			} else {
				$post_status = $post->post_status;
			}
			if ( 'publish' != $post_status ) {
				$enabled = false;
			}
		}

// Run through the sharing filters
		/** This filter is documented in modules/sharedaddy/sharing-service.php */
		$enabled = apply_filters( 'sharing_show', $enabled, $post );

/**
		 * Filters whether the Likes should be visible or not.
		 * Allows overwriting the options set in Settings > Sharing.
		 *
		 * @module likes
		 *
		 * @since 2.2.0
		 *
		 * @param bool $enabled Should the Likes be visible?
		 */
		return (bool) apply_filters( 'wpl_is_likes_visible', $enabled );
	}

/**
	 * Are Post Likes enabled on single posts?
	 *
	 * @param String $post_type custom post type identifier
	 * @return bool
	 */
	function is_single_post_enabled( $post_type = 'post' ) {
		$options = $this->get_options();
		return (bool) apply_filters(
		/**
		 * Filters whether Likes should be enabled on single posts.
		 *
		 * The dynamic part of the filter, {$post_type}, allows you to specific the post type where Likes should be enabled.
		 *
		 * @module likes
		 *
		 * @since 2.2.0
		 *
		 * @param bool $enabled Are Post Likes enabled on single posts?
		 */
			"wpl_is_single_{$post_type}_disabled",
			(bool) in_array( $post_type, $options['show'] )
		);
	}

/**
	 * Get the 'disabled_likes' option from the DB of the current blog.
	 *
	 * @return array
	 */
	function get_options() {
		$setting             = array();
		$setting['disabled'] = get_option( 'disabled_likes'  );
		$sharing             = get_option( 'sharing-options' );

// Default visibility settings
		if ( ! isset( $sharing['global']['show'] ) ) {
			$sharing['global']['show'] = array( 'post', 'page' );

// Scalar check
		} elseif ( is_scalar( $sharing['global']['show'] ) ) {
			switch ( $sharing['global']['show'] ) {
				case 'posts' :
					$sharing['global']['show'] = array( 'post', 'page' );
					break;
				case 'index' :
					$sharing['global']['show'] = array( 'index' );
					break;
				case 'posts-index' :
					$sharing['global']['show'] = array( 'post', 'page', 'index' );
					break;
			}
		}

// Ensure it's always an array (even if not previously empty or scalar)
		$setting['show'] = !empty( $sharing['global']['show'] ) ? (array) $sharing['global']['show'] : array();

/**
		 * Filters where the Likes are displayed.
		 *
		 * @module likes
		 *
		 * @since 2.2.0
		 *
		 * @param array $setting Array of Likes display settings.
		 */
		return apply_filters( 'wpl_get_options', $setting );
	}

/**
	 * Are Post Likes enabled on archive/front/search pages?
	 *
	 * @return bool
	 */
	function is_index_enabled() {
		$options = $this->get_options();
		/**
		 * Filters whether Likes should be enabled on archive/front/search pages.
		 *
		 * @module likes
		 *
		 * @since 2.2.0
		 *
		 * @param bool $enabled Are Post Likes enabled on archive/front/search pages?
		 */
		return (bool) apply_filters( 'wpl_is_index_disabled', (bool) in_array( 'index', $options['show'] ) );
	}

/**
	 * Are Post Likes enabled on single pages?
	 *
	 * @return bool
	 */
	function is_single_page_enabled() {
		$options = $this->get_options();
		/**
		 * Filters whether Likes should be enabled on single pages.
		 *
		 * @module likes
		 *
		 * @since 2.2.0
		 *
		 * @param bool $enabled Are Post Likes enabled on single pages?
		 */
		return (bool) apply_filters( 'wpl_is_single_page_disabled', (bool) in_array( 'page', $options['show'] ) );
	}

/**
	 * Are Media Likes enabled on single pages?
	 *
	 * @return bool
	 */
	function is_attachment_enabled() {
		$options = $this->get_options();
		/**
		 * Filters whether Likes should be enabled on attachment pages.
		 *
		 * @module likes
		 *
		 * @since 2.2.0
		 *
		 * @param bool $enabled Are Post Likes enabled on attachment pages?
		 */
		return (bool) apply_filters( 'wpl_is_attachment_disabled', (bool) in_array( 'attachment', $options['show'] ) );
	}

/**
	 * The actual options block to be inserted into the sharing page.
	 */
	function admin_settings_init() {
		?>
		<tr>
			<th scope="row">
				<label><?php esc_html_e( 'WordPress.com Likes are', 'jetpack' ); ?></label>
			</th>
			<td>
				<div>
					<label>
						<input type="radio" class="code" name="wpl_default" value="on" <?php checked( $this->is_enabled_sitewide(), true ); ?> />
						<?php esc_html_e( 'On for all posts', 'jetpack' ); ?>
					</label>
				</div>
				<div>
					<label>
						<input type="radio" class="code" name="wpl_default" value="off" <?php checked( $this->is_enabled_sitewide(), false ); ?> />
						<?php esc_html_e( 'Turned on per post', 'jetpack' ); ?>
					</label>
					<div>
			</td>
		</tr>
		<?php if ( ! $this->in_jetpack ) : ?>
			<tr>
				<th scope="row">
					<label><?php esc_html_e( 'WordPress.com Reblog Button', 'jetpack' ); ?></label>
				</th>
				<td>
					<div>
						<label>
							<input type="radio" class="code" name="jetpack_reblogs_enabled" value="on" <?php checked( $this->reblogs_enabled_sitewide(), true ); ?> />
							<?php esc_html_e( 'Show the Reblog button on posts', 'jetpack' ); ?>
						</label>
					</div>
					<div>
						<label>
							<input type="radio" class="code" name="jetpack_reblogs_enabled" value="off" <?php checked( $this->reblogs_enabled_sitewide(), false ); ?> />
							<?php esc_html_e( 'Don\'t show the Reblog button on posts', 'jetpack' ); ?>
						</label>
						<div>
				</td>
			</tr>
		<?php endif; ?>
		</tbody> <?php // closes the tbody attached to sharing_show_buttons_on_row_start... ?>
	<?php
	}

/**
	 * Returns the current state of the "WordPress.com Reblogs are" option.
	 * @return boolean true if enabled sitewide, false if not
	 */
	function reblogs_enabled_sitewide() {
		/**
		 * Filters whether Reblogs are enabled by default on all posts.
		 * true if enabled sitewide, false if not.
		 *
		 * @module likes
		 *
		 * @since 3.0.0
		 *
		 * @param bool $option Are Reblogs enabled sitewide.
		 */
		return (bool) apply_filters( 'wpl_reblogging_enabled_sitewide', ! get_option( 'disabled_reblogs' ) );
	}

/**
	 * Saves the setting in the database, bumps a stat on WordPress.com
	 */
	function admin_settings_callback() {
		// We're looking for these, and doing a dance to set some stats and save
		// them together in array option.
		$new_state = !empty( $_POST['wpl_default'] ) ? $_POST['wpl_default'] : 'on';
		$db_state  = $this->is_enabled_sitewide();

$reblogs_new_state = !empty( $_POST['jetpack_reblogs_enabled'] ) ? $_POST['jetpack_reblogs_enabled'] : 'on';
		$reblogs_db_state = $this->reblogs_enabled_sitewide();
		/** Default State *********************************************************/

// Checked (enabled)
		switch( $new_state ) {
			case 'off' :
				if ( true == $db_state && ! $this->in_jetpack ) {
					$g_gif = file_get_contents( 'https://pixel.wp.com/g.gif?v=wpcom-no-pv&x_likes=disabled_likes' );
				}
				update_option( 'disabled_likes', 1 );
				break;
			case 'on'  :
			default:
				if ( false == $db_state && ! $this->in_jetpack ) {
					$g_gif = file_get_contents( 'https://pixel.wp.com/g.gif?v=wpcom-no-pv&x_likes=reenabled_likes' );
				}
				delete_option( 'disabled_likes' );
				break;
		}

switch( $reblogs_new_state ) {
			case 'off' :
				if ( true == $reblogs_db_state && ! $this->in_jetpack ) {
					$g_gif = file_get_contents( 'https://pixel.wp.com/g.gif?v=wpcom-no-pv&x_reblogs=disabled_reblogs' );
				}
				update_option( 'disabled_reblogs', 1 );
				break;
			case 'on'  :
			default:
				if ( false == $reblogs_db_state && ! $this->in_jetpack ) {
					$g_gif = file_get_contents( 'https://pixel.wp.com/g.gif?v=wpcom-no-pv&x_reblogs=reenabled_reblogs' );
				}
				delete_option( 'disabled_reblogs' );
				break;
		}
	}

/**
	 * Adds the admin update hook so we can save settings even if Sharedaddy is not enabled.
	 */
	function process_update_requests_if_sharedaddy_not_loaded() {
		if ( isset( $_GET['page'] ) && ( $_GET['page'] == 'sharing.php' || $_GET['page'] == 'sharing' ) ) {
			if ( isset( $_POST['_wpnonce'] ) && wp_verify_nonce( $_POST['_wpnonce'], 'sharing-options' ) ) {
				/** This action is documented in modules/sharedaddy/sharing.php */
				do_action( 'sharing_admin_update' );
				wp_safe_redirect( admin_url( 'options-general.php?page=sharing&update=saved' ) );
				die();
			}
		}
	}

/**
	 * If sharedaddy is not loaded, we don't have the "Show buttons on" yet, so we need to add that since it affects likes too.
	 */
	function admin_settings_showbuttonon_init() {
		?>
		<?php
		/** This action is documented in modules/sharedaddy/sharing.php */
		echo apply_filters( 'sharing_show_buttons_on_row_start', '<tr valign="top">' );
		?>
		<th scope="row"><label><?php _e( 'Show buttons on', 'jetpack' ); ?></label></th>
		<td>
			<?php
			$br = false;
			$shows = array_values( get_post_types( array( 'public' => true ) ) );
			array_unshift( $shows, 'index' );
			$global = $this->get_options();
			foreach ( $shows as $show ) :
				if ( 'index' == $show ) {
					$label = __( 'Front Page, Archive Pages, and Search Results', 'jetpack' );
				} else {
					$post_type_object = get_post_type_object( $show );
					$label = $post_type_object->labels->name;
				}
				?>
				<?php if ( $br ) echo '<br />'; ?><label><input type="checkbox"<?php checked( in_array( $show, $global['show'] ) ); ?> name="show[]" value="<?php echo esc_attr( $show ); ?>" /> <?php echo esc_html( $label ); ?></label>
				<?php	$br = true; endforeach; ?>
		</td>
		<?php
		/** This action is documented in modules/sharedaddy/sharing.php */
		echo apply_filters( 'sharing_show_buttons_on_row_end', '</tr>' );
		?>
	<?php
	}

/**
	 * If sharedaddy is not loaded, we still need to save the the settings of the "Show buttons on" option.
	 */
	function admin_settings_showbuttonon_callback() {
		$options = get_option( 'sharing-options' );
		if ( !is_array( $options ) )
			$options = array();

$shows = array_values( get_post_types( array( 'public' => true ) ) );
		$shows[] = 'index';
		$data = $_POST;

if ( isset( $data['show'] ) ) {
			if ( is_scalar( $data['show'] ) ) {
				switch ( $data['show'] ) {
					case 'posts' :
						$data['show'] = array( 'post', 'page' );
						break;
					case 'index' :
						$data['show'] = array( 'index' );
						break;
					case 'posts-index' :
						$data['show'] = array( 'post', 'page', 'index' );
						break;
				}
			}

if ( $data['show'] = array_intersect( $data['show'], $shows ) ) {
				$options['global']['show'] = $data['show'];
			}
		} else {
			$options['global']['show'] = array();
		}

update_option( 'sharing-options', $options );
	}
}

Editing: jetpack-likes-settings.php

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