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Editing: sharedaddy.php

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<?php
/*
Plugin Name: Sharedaddy
Description: The most super duper sharing tool on the interwebs.
Version: 0.3.1
Author: Automattic, Inc.
Author URI: http://automattic.com/
Plugin URI: http://en.blog.wordpress.com/2010/08/24/more-ways-to-share/
*/

require_once plugin_dir_path( __FILE__ ).'sharing.php';

function sharing_email_send_post( $data ) {

$content = sharing_email_send_post_content( $data );
	// Borrowed from wp_mail();
	$sitename = strtolower( $_SERVER['SERVER_NAME'] );
	if ( substr( $sitename, 0, 4 ) == 'www.' ) {
		$sitename = substr( $sitename, 4 );
	}

/** This filter is documented in core/src/wp-includes/pluggable.php */
	$from_email = apply_filters( 'wp_mail_from', 'wordpress@' . $sitename );

if ( ! empty( $data['name'] ) ) {
		$s_name = (string) $data['name'];
		$name_needs_encoding_regex =
			'/[' .
				// SpamAssasin's list of characters which "need MIME" encoding
				'\x00-\x08\x0b\x0c\x0e-\x1f\x7f-\xff' .
				// Our list of "unsafe" characters
				'<\r\n' .
			']/';

$needs_encoding =
			// If it contains any blacklisted chars,
			preg_match( $name_needs_encoding_regex, $s_name ) ||
			// Or if we can't use `mb_convert_encoding`
			! function_exists( 'mb_convert_encoding' ) ||
			// Or if it's not already ASCII
			mb_convert_encoding( $data['name'], 'ASCII' ) !== $s_name;

if ( $needs_encoding ) {
			$data['name'] = sprintf( '=?UTF-8?B?%s?=', base64_encode( $data['name'] ) );
		}
	}

$headers[] = sprintf( 'From: %1$s <%2$s>', $data['name'], $from_email );
	$headers[] = sprintf( 'Reply-To: %1$s <%2$s>', $data['name'], $data['source'] );

// Make sure to pass the title through the normal sharing filters.
	$title = $data['sharing_source']->get_share_title( $data['post']->ID );

wp_mail( $data['target'], '[' . __( 'Shared Post', 'jetpack' ) . '] ' . $title, $content, $headers );
}

/* Checks for spam using akismet if available. */
/* Return $data as it if email about to be send out is not spam. */
function sharing_email_check_for_spam_via_akismet( $data ) {

if ( ! Jetpack::is_akismet_active() )
		return $data;

// Prepare the body_request for akismet
	$body_request = array(
		'blog'                  => get_option( 'home' ),
		'permalink'             => $data['sharing_source']->get_share_url( $data['post']->ID ),
		'comment_type'          => 'share',
		'comment_author'        => $data['name'],
		'comment_author_email'  => $data['source'],
		'comment_content'       => sharing_email_send_post_content( $data ),
		'user_agent'            => ( isset( $_SERVER['HTTP_USER_AGENT'] ) ? $_SERVER['HTTP_USER_AGENT'] : null ),
		);

if ( method_exists( 'Akismet', 'http_post' ) ) {
		$body_request['user_ip']	= Akismet::get_ip_address();
		$response = Akismet::http_post( build_query( $body_request ), 'comment-check' );
	} else {
		global $akismet_api_host, $akismet_api_port;
		$body_request['user_ip'] 	= ( isset( $_SERVER['REMOTE_ADDR'] ) ? $_SERVER['REMOTE_ADDR'] : null );
		$response = akismet_http_post( build_query( $body_request ), $akismet_api_host, '/1.1/comment-check', $akismet_api_port );
	}

// The Response is spam lets not send the email.
	if ( ! empty( $response ) && isset( $response[1] ) && 'true' == trim( $response[1] ) ) { // 'true' is spam
		return false; // don't send the email
	}
	return $data;
}

function sharing_email_send_post_content( $data ) {
	/* translators: included in email when post is shared via email. First item is sender's name. Second is sender's email address. */
	$content  = sprintf( __( '%1$s (%2$s) thinks you may be interested in the following post:', 'jetpack' ), $data['name'], $data['source'] );
	$content .= "\n\n";
	// Make sure to pass the title and URL through the normal sharing filters.
	$content .= $data['sharing_source']->get_share_title( $data['post']->ID ) . "\n";
	$content .= $data['sharing_source']->get_share_url( $data['post']->ID ) . "\n";
	return $content;
}

function sharing_add_meta_box() {
	global $post;
	if ( empty( $post ) ) { // If a current post is not defined, such as when editing a comment.
		return;
	}

/**
	 * Filter whether to display the Sharing Meta Box or not.
	 *
	 * @module sharedaddy
	 *
	 * @since 3.8.0
	 *
	 * @param bool true Display Sharing Meta Box.
	 * @param $post Post.
	 */
	if ( ! apply_filters( 'sharing_meta_box_show', true, $post ) ) {
		return;
	}

$post_types = get_post_types( array( 'public' => true ) );
	/**
	 * Filter the Sharing Meta Box title.
	 *
	 * @module sharedaddy
	 *
	 * @since 2.2.0
	 *
	 * @param string $var Sharing Meta Box title. Default is "Sharing".
	 */
	$title = apply_filters( 'sharing_meta_box_title', __( 'Sharing', 'jetpack' ) );
	if ( $post->ID !== get_option( 'page_for_posts' ) ) {
		foreach( $post_types as $post_type ) {
			add_meta_box( 'sharing_meta', $title, 'sharing_meta_box_content', $post_type, 'advanced', 'high' );
		}
	}
}

function sharing_meta_box_content( $post ) {
	/**
	 * Fires before the sharing meta box content.
	 *
	 * @module sharedaddy
	 *
	 * @since 2.2.0
	 *
	 * @param WP_Post $post The post to share.
	 */
	do_action( 'start_sharing_meta_box_content', $post );

$disabled = get_post_meta( $post->ID, 'sharing_disabled', true ); ?>

<?php
	/**
	 * Fires after the sharing meta box content.
	 *
	 * @module sharedaddy
	 *
	 * @since 2.2.0
	 *
	 * @param WP_Post $post The post to share.
	*/
	do_action( 'end_sharing_meta_box_content', $post );
}

function sharing_meta_box_save( $post_id ) {
	if ( defined('DOING_AUTOSAVE') && DOING_AUTOSAVE )
		return $post_id;

// Record sharing disable
	if ( isset( $_POST['post_type'] ) && ( $post_type_object = get_post_type_object( $_POST['post_type'] ) ) && $post_type_object->public ) {
		if ( current_user_can( 'edit_post', $post_id ) ) {
			if ( isset( $_POST['sharing_status_hidden'] ) ) {
				if ( !isset( $_POST['enable_post_sharing'] ) ) {
					update_post_meta( $post_id, 'sharing_disabled', 1 );
				} else {
					delete_post_meta( $post_id, 'sharing_disabled' );
				}
			}
		}
	}

return $post_id;
}

function sharing_meta_box_protected( $protected, $meta_key, $meta_type ) {
	if ( 'sharing_disabled' == $meta_key )
		$protected = true;

return $protected;
}

add_filter( 'is_protected_meta', 'sharing_meta_box_protected', 10, 3 );

function sharing_plugin_settings( $links ) {
	$settings_link = '<a href="options-general.php?page=sharing.php">'.__( 'Settings', 'jetpack' ).'</a>';
	array_unshift( $links, $settings_link );
	return $links;
}

function sharing_add_plugin_settings($links, $file) {
	if ( $file == basename( dirname( __FILE__ ) ).'/'.basename( __FILE__ ) ) {
		$links[] = '<a href="options-general.php?page=sharing.php">' . __( 'Settings', 'jetpack' ) . '</a>';
		$links[] = '<a href="http://support.wordpress.com/sharing/" target="_blank">' . __( 'Support', 'jetpack' ) . '</a>';
	}

return $links;
}

function sharing_restrict_to_single( $services ) {
	// This removes Press This from non-multisite blogs - doesn't make much sense
	if ( is_multisite() === false ) {
		unset( $services['press-this'] );
	}

return $services;
}

function sharing_init() {
	if ( Jetpack_Options::get_option_and_ensure_autoload( 'sharedaddy_disable_resources', '0' ) ) {
		add_filter( 'sharing_js', 'sharing_disable_js' );
		remove_action( 'wp_head', 'sharing_add_header', 1 );
	}
}

function sharing_disable_js() {
	return false;
}

function sharing_global_resources() {
	$disable = get_option( 'sharedaddy_disable_resources' );
?>
<tr valign="top">
	<th scope="row"><label for="disable_css"><?php _e( 'Disable CSS and JS', 'jetpack' ); ?></label></th>
	<td>
		<input id="disable_css" type="checkbox" name="disable_resources" <?php if ( $disable == 1 ) echo ' checked="checked"'; ?>/>  <small><em><?php _e( 'Advanced.  If this option is checked, you must include these files in your theme manually for the sharing links to work.', 'jetpack' ); ?></em></small>
	</td>
</tr>
<?php
}

function sharing_global_resources_save() {
	update_option( 'sharedaddy_disable_resources', isset( $_POST['disable_resources'] ) ? 1 : 0 );
}

function sharing_email_dialog() {
	require_once plugin_dir_path( __FILE__ ) . 'recaptcha.php';

$recaptcha = new Jetpack_ReCaptcha( RECAPTCHA_PUBLIC_KEY, RECAPTCHA_PRIVATE_KEY );
	echo $recaptcha->get_recaptcha_html(); // xss ok
}

function sharing_email_check( $true, $post, $data ) {
	require_once plugin_dir_path( __FILE__ ) . 'recaptcha.php';

$recaptcha = new Jetpack_ReCaptcha( RECAPTCHA_PUBLIC_KEY, RECAPTCHA_PRIVATE_KEY );
	$response  = ! empty( $_POST['g-recaptcha-response'] ) ? $_POST['g-recaptcha-response'] : '';
	$result    = $recaptcha->verify( $response, $_SERVER['REMOTE_ADDR'] );

return ( true === $result );
}

add_action( 'init', 'sharing_init' );
add_action( 'add_meta_boxes', 'sharing_add_meta_box' );
add_action( 'save_post', 'sharing_meta_box_save' );
add_action( 'sharing_email_send_post', 'sharing_email_send_post' );
add_filter( 'sharing_email_can_send', 'sharing_email_check_for_spam_via_akismet' );
add_action( 'sharing_global_options', 'sharing_global_resources', 30 );
add_action( 'sharing_admin_update', 'sharing_global_resources_save' );
add_filter( 'sharing_services', 'sharing_restrict_to_single' );
add_action( 'plugin_action_links_'.basename( dirname( __FILE__ ) ).'/'.basename( __FILE__ ), 'sharing_plugin_settings', 10, 4 );
add_filter( 'plugin_row_meta', 'sharing_add_plugin_settings', 10, 2 );

if ( defined( 'RECAPTCHA_PUBLIC_KEY' ) && defined( 'RECAPTCHA_PRIVATE_KEY' ) ) {
	add_action( 'sharing_email_dialog', 'sharing_email_dialog' );
	add_filter( 'sharing_email_check', 'sharing_email_check', 10, 3 );
}

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