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Editing: facebook-likebox.php

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<?php

/**
 * Register the widget for use in Appearance -> Widgets
 */
add_action( 'widgets_init', 'jetpack_facebook_likebox_init' );

function jetpack_facebook_likebox_init() {
	register_widget( 'WPCOM_Widget_Facebook_LikeBox' );
}

/**
 * Facebook Page Plugin (formerly known as the Like Box)
 * Display a Facebook Page Plugin as a widget (replaces the old like box plugin)
 * https://developers.facebook.com/docs/plugins/page-plugin
 */
class WPCOM_Widget_Facebook_LikeBox extends WP_Widget {

private $default_height       = 580;
	private $default_width        = 340;
	private $max_width            = 500;
	private $min_width            = 180;
	private $max_height           = 9999;
	private $min_height           = 130;

function __construct() {
		parent::__construct(
			'facebook-likebox',
			/**
			 * Filter the name of a widget included in the Extra Sidebar Widgets module.
			 *
			 * @module widgets
			 *
			 * @since 2.1.2
			 *
			 * @param string $widget_name Widget title.
			 */
			apply_filters( 'jetpack_widget_name', __( 'Facebook Page Plugin', 'jetpack' ) ),
			array(
				'classname' => 'widget_facebook_likebox',
				'description' => __( 'Use the Facebook Page Plugin to connect visitors to your Facebook Page', 'jetpack' ),
				'customize_selective_refresh' => true,
			)
		);

if ( is_active_widget( false, false, $this->id_base ) || is_active_widget( false, false, 'monster' ) || is_customize_preview() ) {
			add_action( 'wp_enqueue_scripts', array( $this, 'enqueue_scripts' ) );
		}
	}

/**
	 * Enqueue scripts.
	 */
	public function enqueue_scripts() {
		wp_enqueue_script( 'jetpack-facebook-embed' );
		wp_enqueue_style( 'jetpack_facebook_likebox', plugins_url( 'facebook-likebox/style.css', __FILE__ ) );
		wp_style_add_data( 'jetpack_facebook_likebox', 'jetpack-inline', true );
	}

function widget( $args, $instance ) {
		extract( $args );

$like_args = $this->normalize_facebook_args( $instance['like_args'] );

if ( empty( $like_args['href'] ) || ! $this->is_valid_facebook_url( $like_args['href'] ) ) {
			if ( current_user_can('edit_theme_options') ) {
				echo $before_widget;
				echo '<p>' . sprintf( __( 'It looks like your Facebook URL is incorrectly configured. Please check it in your <a href="%s">widget settings</a>.', 'jetpack' ), admin_url( 'widgets.php' ) ) . '</p>';
				echo $after_widget;
			}
			echo '';
			return;
		}

/** This filter is documented in core/src/wp-includes/default-widgets.php */
		$title    = apply_filters( 'widget_title', $instance['title'] );
		$page_url = set_url_scheme( $like_args['href'], 'https' );

$like_args['show_faces'] = (bool) $like_args['show_faces'] ? 'true'  : 'false';
		$like_args['stream']     = (bool) $like_args['stream']     ? 'true'  : 'false';
		$like_args['cover']      = (bool) $like_args['cover']      ? 'false' : 'true';

echo $before_widget;

if ( ! empty( $title ) ) :
			echo $before_title;

$likebox_widget_title = '<a href="' . esc_url( $page_url ) . '">' . esc_html( $title ) . '</a>';

/**
			 * Filter Facebook Likebox's widget title.
			 *
			 * @module widgets
			 *
			 * @since 3.3.0
			 *
			 * @param string $likebox_widget_title Likebox Widget title (including a link to the Page URL).
			 * @param string $title Widget title as set in the widget settings.
			 * @param string $page_url Facebook Page URL.
			 */
			echo apply_filters( 'jetpack_facebook_likebox_title', $likebox_widget_title, $title, $page_url );

echo $after_title;
		endif;

?>
		<div id="fb-root"></div>
		<div class="fb-page" data-href="<?php echo esc_url( $page_url ); ?>" data-width="<?php echo intval( $like_args['width'] ); ?>"  data-height="<?php echo intval( $like_args['height'] ); ?>" data-hide-cover="<?php echo esc_attr( $like_args['cover'] ); ?>" data-show-facepile="<?php echo esc_attr( $like_args['show_faces'] ); ?>" data-show-posts="<?php echo esc_attr( $like_args['stream'] ); ?>">
		<div class="fb-xfbml-parse-ignore"><blockquote cite="<?php echo esc_url( $page_url ); ?>"><a href="<?php echo esc_url( $page_url ); ?>"><?php echo esc_html( $title ); ?></a></blockquote></div>
		</div>
		<?php
		wp_enqueue_script( 'jetpack-facebook-embed' );
		echo $after_widget;

/** This action is documented in modules/widgets/gravatar-profile.php */
		do_action( 'jetpack_stats_extra', 'widget_view', 'facebook-likebox' );
	}

function update( $new_instance, $old_instance ) {
		$instance = array(
			'title' => '',
			'like_args' => $this->get_default_args(),
		);

$instance['title'] = trim( strip_tags( stripslashes( $new_instance['title'] ) ) );

// Set up widget values
		$instance['like_args'] = array(
			'href'        => trim( strip_tags( stripslashes( $new_instance['href'] ) ) ),
			'width'       => (int) $new_instance['width'],
			'height'      => (int) $new_instance['height'],
			'show_faces'  => isset( $new_instance['show_faces'] ),
			'stream'      => isset( $new_instance['stream'] ),
			'cover'       => isset( $new_instance['cover'] ),
		);

$instance['like_args'] = $this->normalize_facebook_args( $instance['like_args'] );

return $instance;
	}

function form( $instance ) {
		$instance = wp_parse_args( (array) $instance, array(
			'title'     => '',
			'like_args' => $this->get_default_args()
		) );
		$like_args = $this->normalize_facebook_args( $instance['like_args'] );
		?>

<p>
			<label for="<?php echo esc_attr( $this->get_field_id( 'title' ) ); ?>">
				<?php _e( 'Title', 'jetpack' ); ?>
				<input type="text" name="<?php echo esc_attr( $this->get_field_name( 'title' ) ); ?>" id="<?php echo esc_attr( $this->get_field_id( 'title' ) ); ?>" value="<?php echo esc_attr( $instance['title'] ); ?>" class="widefat" />
			</label>
		</p>

<p>
			<label for="<?php echo esc_attr( $this->get_field_id( 'href' ) ); ?>">
				<?php _e( 'Facebook Page URL', 'jetpack' ); ?>
				<input type="text" name="<?php echo esc_attr( $this->get_field_name( 'href' ) ); ?>" id="<?php echo esc_attr( $this->get_field_id( 'href' ) ); ?>" value="<?php echo esc_url( $like_args['href'] ); ?>" class="widefat" />
				<br />
				<small><?php _e( 'The widget only works with Facebook Pages.', 'jetpack' ); ?></small>
			</label>
		</p>

<p>
			<label for="<?php echo esc_attr( $this->get_field_id( 'width' ) ); ?>">
				<?php _e( 'Width in pixels', 'jetpack' ); ?>
				<input type="number" class="smalltext" min="<?php echo esc_attr( $this->min_width ); ?>" max="<?php echo esc_attr( $this->max_width ); ?>" maxlength="3" name="<?php echo esc_attr( $this->get_field_name( 'width' ) ); ?>" id="<?php echo esc_attr( $this->get_field_id( 'width' ) ); ?>" value="<?php echo esc_attr( $like_args['width'] ); ?>" style="text-align: center;" />
				<small><?php echo sprintf( __( 'Minimum: %s', 'jetpack' ), $this->min_width ); ?> / <?php echo sprintf( __( 'Maximum: %s', 'jetpack' ), $this->max_width ); ?></small>
			</label>
		</p>

<p>
			<label for="<?php echo esc_attr( $this->get_field_id( 'height' ) ); ?>">
				<?php _e( 'Height in pixels', 'jetpack' ); ?>
				<input type="number" class="smalltext" min="<?php echo esc_attr( $this->min_height ); ?>" max="<?php echo esc_attr( $this->max_height ); ?>" maxlength="3" name="<?php echo esc_attr( $this->get_field_name( 'height' ) ); ?>" id="<?php echo esc_attr( $this->get_field_id( 'height' ) ); ?>" value="<?php echo esc_attr( $like_args['height'] ); ?>" style="text-align: center;" />
				<small><?php echo sprintf( __( 'Minimum: %s', 'jetpack' ), $this->min_height ); ?> / <?php echo sprintf( __( 'Maximum: %s', 'jetpack' ), $this->max_height ); ?></small>
			</label>
		</p>

<p>
			<label for="<?php echo esc_attr( $this->get_field_id( 'show_faces' ) ); ?>">
				<input type="checkbox" name="<?php echo esc_attr( $this->get_field_name( 'show_faces' ) ); ?>" id="<?php echo esc_attr( $this->get_field_id( 'show_faces' ) ); ?>" <?php checked( $like_args['show_faces'] ); ?> />
				<?php _e( 'Show Faces', 'jetpack' ); ?>
				<br />
				<small><?php _e( 'Show profile photos in the plugin.', 'jetpack' ); ?></small>
			</label>
		</p>

<p>
			<label for="<?php echo esc_attr( $this->get_field_id( 'stream' ) ); ?>">
				<input type="checkbox" name="<?php echo esc_attr( $this->get_field_name( 'stream' ) ); ?>" id="<?php echo esc_attr( $this->get_field_id( 'stream' ) ); ?>" <?php checked( $like_args['stream'] ); ?> />
				<?php _e( 'Show Stream', 'jetpack' ); ?>
				<br />
				<small><?php _e( 'Show Page Posts.', 'jetpack' ); ?></small>
			</label>
		</p>

<p>
			<label for="<?php echo esc_attr( $this->get_field_id( 'cover' ) ); ?>">
				<input type="checkbox" name="<?php echo esc_attr( $this->get_field_name( 'cover' ) ); ?>" id="<?php echo esc_attr( $this->get_field_id( 'cover' ) ); ?>" <?php checked( $like_args['cover'] ); ?> />
				<?php _e( 'Show Cover Photo', 'jetpack' ); ?>
				<br />
			</label>
		</p>

<?php
	}

function get_default_args() {
		$defaults = array(
			'href'        => '',
			'width'       => $this->default_width,
			'height'      => $this->default_height,
			'show_faces'  => 'true',
			'stream'      => '',
			'cover'       => 'true',
		);

/**
		 * Filter Facebook Likebox default options.
		 *
		 * @module widgets
		 *
		 * @since 1.3.1
		 *
		 * @param array $defaults Array of default options.
		 */
		return apply_filters( 'jetpack_facebook_likebox_defaults', $defaults );
	}

function normalize_facebook_args( $args ) {
		$args = wp_parse_args( (array) $args, $this->get_default_args() );

// Validate the Facebook Page URL
		if ( $this->is_valid_facebook_url( $args['href'] ) ) {
			$temp = explode( '?', $args['href'] );
			$args['href'] = str_replace( array( 'http://facebook.com', 'https://facebook.com' ), array( 'http://www.facebook.com', 'https://www.facebook.com' ), $temp[0] );
		} else {
			$args['href'] = '';
		}

$args['width']      = $this->normalize_int_value(  (int) $args['width'], $this->default_width,   $this->max_width,  $this->min_width );
		$args['height']     = $this->normalize_int_value(  (int) $args['height'], $this->default_height, $this->max_height, $this->min_height );
		$args['show_faces'] = (bool) $args['show_faces'];
		$args['stream']     = (bool) $args['stream'];
		$args['cover']      = (bool) $args['cover'];

// The height used to be dependent on other widget settings
		// If the user changes those settings but doesn't customize the height,
		// let's intelligently assign a new height.
		if ( in_array( $args['height'], array( 580, 110, 432 ) ) ) {
			if ( $args['show_faces'] && $args['stream'] ) {
				$args['height'] = 580;
			} else if ( ! $args['show_faces'] && ! $args['stream'] ) {
				$args['height'] = 130;
			} else {
				$args['height'] = 432;
			}
		}

return $args;
	}

function is_valid_facebook_url( $url ) {
		return ( false !== strpos( $url, 'facebook.com' ) ) ? true : false;
	}

function normalize_int_value( $value, $default = 0, $max = 0, $min = 0 ) {
		$value = (int) $value;

if ( $value > $max ) {
			$value = $max;
		} else if ( $value < $min ) {
			$value = $min;
		}

return (int) $value;
	}

function normalize_text_value( $value, $default = '', $allowed = array() ) {
		$allowed = (array) $allowed;

if ( empty( $value ) || ( ! empty( $allowed ) && ! in_array( $value, $allowed ) ) )
			$value = $default;

return $value;
	}

/**
	 * @deprecated
	 */
	function guess_locale_from_lang( $lang ) {
		_deprecated_function( __METHOD__, '4.0.0', 'Jetpack::guess_locale_from_lang()' );
		Jetpack::$instance->guess_locale_from_lang( $lang );
	}

/**
	 * @deprecated
	 */
	function get_locale() {
		_deprecated_function( __METHOD__, '4.0.0', 'Jetpack::get_locale()' );
		Jetpack::$instance->get_locale();
	}
}

Editing: facebook-likebox.php

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