<?php

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/**

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* Module Name: WP.me Shortlinks

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* Module Description: Share short, easy-to-remember links to your posts and pages.

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* Sort Order: 8

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* First Introduced: 1.1

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* Requires Connection: Yes

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* Auto Activate: No

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* Module Tags: Social

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* Feature: Writing

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* Additional Search Queries: shortlinks, wp.me

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*

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* @package automattic/jetpack

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*/

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if ( ! defined( 'ABSPATH' ) ) {

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exit( 0 );

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}

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add_filter( 'pre_get_shortlink', 'wpme_get_shortlink_handler', 1, 4 );

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if ( ! function_exists( 'wpme_dec2sixtwo' ) ) {

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/**

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* Converts number to base 62.

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*

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* @param int $num Number.

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*

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* @return string Value in base 62.

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*/

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function wpme_dec2sixtwo( $num ) {

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$index = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';

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$out = '';

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if ( $num < 0 ) {

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$out = '-';

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$num = abs( $num );

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}

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for ( $t = floor( log10( $num ) / log10( 62 ) ); $t >= 0; $t-- ) {

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$a = floor( $num / pow( 62, $t ) );

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$out = $out . substr( $index, $a, 1 );

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$num = $num - ( $a * pow( 62, $t ) );

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}

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return $out;

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}

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}

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/**

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* Returns the WP.me shortlink.

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*

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* @param int $id Post ID, or 0 for the current post.

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* @param string $context The context for the link. One of 'post' or 'query'.

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* @param bool $allow_slugs Whether to allow post slugs in the shortlink.

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*

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* @return string

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*/

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function wpme_get_shortlink( $id = 0, $context = 'post', $allow_slugs = true ) {

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global $wp_query;

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$blog_id = Jetpack_Options::get_option( 'id' );

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if ( 'query' === $context ) {

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if ( is_singular() ) {

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$id = $wp_query->get_queried_object_id();

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$context = 'post';

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} elseif ( is_front_page() ) {

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$context = 'blog';

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} else {

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return '';

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}

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}

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if ( 'blog' === $context ) {

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if ( empty( $id ) ) {

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$id = $blog_id;

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}

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return 'https://wp.me/' . wpme_dec2sixtwo( $id );

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}

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$post = get_post( $id );

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if ( empty( $post ) ) {

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return '';

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}

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$post_id = $post->ID;

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$type = '';

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if ( $allow_slugs && 'publish' === $post->post_status && 'post' === $post->post_type && strlen( $post->post_name ) <= 8 && ! str_contains( $post->post_name, '%' )

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&& ! str_contains( $post->post_name, '-' ) ) {

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$id = $post->post_name;

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$type = 's';

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} else {

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$id = wpme_dec2sixtwo( $post_id );

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if ( 'page' === $post->post_type ) {

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$type = 'P';

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} elseif ( 'post' === $post->post_type || post_type_supports( $post->post_type, 'shortlinks' ) ) {

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$type = 'p';

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} elseif ( 'attachment' === $post->post_type ) {

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$type = 'a';

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}

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}

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if ( empty( $type ) ) {

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return '';

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}

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return 'https://wp.me/' . $type . wpme_dec2sixtwo( $blog_id ) . '-' . $id;

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}

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/**

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* Get the shortlink handler.

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*

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* Used with the Core pre_get_shortlink hook.

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*

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* @param string $shortlink Shortlink value from the action. Ignored.

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* @param int $id Post ID (0 for the current post).

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* @param string $context The context for the link. One of 'post' or 'query'.

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* @param bool $allow_slugs Whether to allow post slugs in the shortlink.

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*

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* @return string

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*/

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function wpme_get_shortlink_handler( $shortlink, $id, $context, $allow_slugs ) {

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return wpme_get_shortlink( $id, $context, $allow_slugs );

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}

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/**

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* Add Shortlinks to the REST API responses.

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*

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* @since 6.9.0

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*

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* @action rest_api_init

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* @uses register_rest_field, wpme_rest_get_shortlink

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*/

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function wpme_rest_register_shortlinks() {

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// Post types that support shortlinks by default.

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$supported_post_types = array(

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'attachment',

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'page',

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'post',

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);

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// Add any CPT that may have declared support for shortlinks.

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foreach ( get_post_types() as $post_type ) {

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if (

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post_type_supports( $post_type, 'shortlinks' )

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&& post_type_supports( $post_type, 'editor' )

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) {

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$supported_post_types[] = $post_type;

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}

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}

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register_rest_field(

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$supported_post_types,

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'jetpack_shortlink',

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array(

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'get_callback' => 'wpme_rest_get_shortlink',

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'update_callback' => null,

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'schema' => null,

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)

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);

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}

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/**

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* Get the shortlink of a post.

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*

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* @since 6.9.0

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*

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* @param array $object Details of current post.

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*

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* @uses wpme_get_shortlink

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*

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* @return string

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*/

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function wpme_rest_get_shortlink( $object ) {

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$object_id = $object['id'] ?? 0;

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return wpme_get_shortlink( $object_id, array() );

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}

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// Add shortlinks to the REST API Post response.

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add_action( 'rest_api_init', 'wpme_rest_register_shortlinks' );

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/**

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* Set the Shortlink Gutenberg extension as available.

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*/

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function wpme_set_extension_available() {

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Jetpack_Gutenberg::set_extension_available( 'shortlinks' );

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}

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add_action( 'init', 'wpme_set_extension_available' );

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