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Editing: social-links.php

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<?php
/**
 * Social Links.
 *
 * This feature will only be activated for themes that declare their support.
 * This can be done by adding code similar to the following during the
 * 'after_setup_theme' action:
 *
 * add_theme_support( 'social-links', array(
 *     'facebook', 'twitter', 'linkedin', 'tumblr', 'google_plus',
 * ) );
 */

function jetpack_theme_supports_social_links() {
	if ( current_theme_supports( 'social-links' ) && function_exists( 'publicize_init' ) ) {
		new Social_Links();
	}
}
add_action( 'init', 'jetpack_theme_supports_social_links', 30 );

if ( ! class_exists( 'Social_Links' ) ) {

class Social_Links {

/**
	 * The links the user set for each service.
	 *
	 * @var array
	 */
	private $links;

/**
	 * A Publicize object.
	 *
	 * @var Publicize
	 */
	private $publicize;

/**
	 * An array with all services that are supported by both Publicize and the
	 * currently active theme.
	 *
	 * @var array
	 */
	private $services = array();

/**
	 * An array of the services the theme supports
	 *
	 * @var array
	 */
	private $theme_supported_services = array();

/**
	 * Constructor.
	 */
	public function __construct() {
		$theme_support = get_theme_support( 'social-links' );

/* An array of named arguments must be passed as the second parameter
		 * of add_theme_support().
		 */
		if ( empty( $theme_support[0] ) )
			return;

$this->theme_supported_services = $theme_support[0];
		$this->links = Jetpack_Options::get_option( 'social_links', array() );

$this->admin_setup();

add_filter( 'jetpack_has_social_links', array( $this, 'has_social_links' ) );
		add_filter( 'jetpack_get_social_links', array( $this, 'get_social_links' ) );

foreach ( $theme_support[0] as $service ) {
			add_filter( "pre_option_jetpack-$service", array( $this, 'get_social_link_filter' ) ); // get_option( 'jetpack-service' );
			add_filter( "theme_mod_jetpack-$service",  array( $this, 'get_social_link_filter' ) ); // get_theme_mod( 'jetpack-service' );
		}
	}

public function admin_setup() {
		if ( ! current_user_can( 'manage_options' ) ) {
			return;
		}

if ( ! is_admin() && ! $this->is_customize_preview() ) {
			return;
		}

$this->publicize = publicize_init();
		$publicize_services = $this->publicize->get_services( 'connected' );
		$this->services  = array_intersect( array_keys( $publicize_services ), $this->theme_supported_services );

add_action( 'publicize_connected', array( $this, 'check_links' ), 20 );
		add_action( 'publicize_disconnected', array( $this, 'check_links' ), 20 );
		add_action( 'customize_register', array( $this, 'customize_register' ) );
		add_filter( 'sanitize_option_jetpack_options', array( $this, 'sanitize_link' ) );
	}

/**
	 * Compares the currently saved links with the connected services and removes
	 * links from services that are no longer connected.
	 *
	 * @return void
	 */
	public function check_links() {
		$active_links = array_intersect_key( $this->links, array_flip( $this->services ) );

if ( $active_links !== $this->links ) {
			$this->links = $active_links;
			Jetpack_Options::update_option( 'social_links', $active_links );
		}
	}

/**
	 * Add social link dropdown to the Customizer.
	 *
	 * @param WP_Customize_Manager $wp_customize Theme Customizer object.
	 */
	public function customize_register( $wp_customize ) {
		$wp_customize->add_section( 'jetpack_social_links', array(
			'title'    => __( 'Connect', 'jetpack' ),
			'priority' => 35,
		) );

foreach ( array_keys( $this->publicize->get_services( 'all' ) ) as $service ) {
			$choices = $this->get_customize_select( $service );

if ( empty( $choices ) ) {
				continue;
			}

$wp_customize->add_setting( "jetpack_options[social_links][$service]", array(
				'type'    => 'option',
				'default' => '',
			) );

$wp_customize->add_control( "jetpack-$service", array(
				'label'    => $this->publicize->get_service_label( $service ),
				'section'  => 'jetpack_social_links',
				'settings' => "jetpack_options[social_links][$service]",
				'type'     => 'select',
				'choices'  => $choices,
			) );
		}
	}

/**
	 * Sanitizes social links.
	 *
	 * @param array $option The incoming values to be sanitized.
	 * @returns array
	 */
	public function sanitize_link( $option ) {
		foreach ( $this->services as $service ) {
			if ( ! empty( $option['social_links'][ $service ] ) )
				$option['social_links'][ $service ] = esc_url_raw( $option['social_links'][ $service ] );
			else
				unset( $option['social_links'][ $service ] );
		}

return $option;
	}

/**
	 * Returns whether there are any social links set.
	 *
	 * @returns bool
	 */
	public function has_social_links() {
		return ! empty( $this->links );
	}

/**
	 * Return available social links.
	 *
	 * @returns array
	 */
	public function get_social_links() {
		return $this->links;
	}

/**
	 * Short-circuits get_option and get_theme_mod calls.
	 *
	 * @param string $link The incoming value to be replaced.
	 * @returns string $link The social link that we've got.
	 */
	public function get_social_link_filter( $link ) {
		if ( preg_match( '/_jetpack-(.+)$/i', current_filter(), $matches ) && ! empty( $this->links[ $matches[1] ] ) )
			return $this->links[ $matches[1] ];

return $link;
	}

/**
	 * Puts together an array of choices for a specific service.
	 *
	 * @param string $service The social service.
	 * @return array An associative array with profile links and display names.
	 */
	private function get_customize_select( $service ) {
		$choices = array(
			'' => __( '&mdash; Select &mdash;', 'jetpack' )
		);

if ( isset( $this->links[ $service ] ) ) {
			$choices[ $this->links[ $service ] ] = $this->links[ $service ];
		}

$connected_services = $this->publicize->get_services( 'connected' );
		if ( isset( $connected_services[ $service ] ) ) {
			foreach ( $connected_services[ $service ] as $c ) {
				$profile_link = $this->publicize->get_profile_link( $service, $c );

if ( false === $profile_link ) {
					continue;
				}

$choices[ $profile_link ] = $this->publicize->get_display_name( $service, $c );
			}
		}

if ( 1 === count( $choices ) ) {
			return array();
		}

return $choices;
	}

/**
	 * Back-compat function for versions prior to 4.0.
	 */
	private function is_customize_preview() {
		global $wp_customize;
		return is_a( $wp_customize, 'WP_Customize_Manager' ) && $wp_customize->is_preview();
	}
}

} // end if ( ! class_exists( 'Social_Links' )

Editing: social-links.php

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