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1<?php
2/**
3 * Subscriber Login Block.
4 *
5 * @since 13.1
6 *
7 * @package automattic/jetpack
8 */
9
10namespace Automattic\Jetpack\Extensions\Subscriber_Login;
11
12use Automattic\Jetpack\Blocks;
13use Automattic\Jetpack\Extensions\Premium_Content\Subscription_Service\Abstract_Token_Subscription_Service;
14use Automattic\Jetpack\Status\Host;
15use Automattic\Jetpack\Status\Request;
16use Jetpack;
17use Jetpack_Gutenberg;
18use Jetpack_Memberships;
19use Jetpack_Options;
20
21if ( ! defined( 'ABSPATH' ) ) {
22    exit( 0 );
23}
24
25require_once __DIR__ . '/class-jetpack-subscription-site.php';
26
27/**
28 * Registers the block for use in Gutenberg
29 * This is done via an action so that we can disable
30 * registration if we need to.
31 */
32function register_block() {
33    if (
34        ! Jetpack::is_module_active( 'subscriptions' ) ||
35        ! class_exists( 'Jetpack_Memberships' ) ||
36        ! class_exists( 'Automattic\Jetpack\Extensions\Premium_Content\Subscription_Service\Abstract_Token_Subscription_Service' )
37    ) {
38        return;
39    }
40
41    Blocks::jetpack_register_block(
42        __DIR__,
43        array( 'render_callback' => __NAMESPACE__ . '\render_block' )
44    );
45
46    add_filter(
47        'jetpack_options_whitelist',
48        function ( $options ) {
49            $options[] = 'jetpack_subscriptions_login_navigation_enabled';
50
51            return $options;
52        }
53    );
54
55    // If called via REST API, we need to register later in the lifecycle
56    if ( ( new Host() )->is_wpcom_platform() && ! Request::is_frontend() ) {
57        add_action(
58            'restapi_theme_init',
59            function () {
60                Jetpack_Subscription_Site::init()->handle_subscriber_login_block_placements();
61            }
62        );
63    } else {
64        Jetpack_Subscription_Site::init()->handle_subscriber_login_block_placements();
65    }
66}
67add_action( 'init', __NAMESPACE__ . '\register_block' );
68
69/**
70 * Returns current URL.
71 *
72 * @return string
73 */
74function get_current_url() {
75    if ( ! isset( $_SERVER['HTTP_HOST'] ) || ! isset( $_SERVER['REQUEST_URI'] ) ) {
76        return '';
77    }
78
79    return ( is_ssl() ? 'https://' : 'http://' ) . wp_unslash( $_SERVER['HTTP_HOST'] ) . wp_unslash( $_SERVER['REQUEST_URI'] ); // phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized
80}
81
82/**
83 * Returns subscriber log in URL.
84 *
85 * @param string $redirect Path to redirect to on login.
86 *
87 * @return string
88 */
89function get_subscriber_login_url( $redirect ) {
90    $redirect = ! empty( $redirect ) ? $redirect : get_site_url();
91
92    if ( ( new Host() )->is_wpcom_simple() ) {
93        // On WPCOM we will redirect immediately
94        return wpcom_logmein_redirect_url( $redirect, false, null, 'link', get_current_blog_id() );
95    }
96
97    // On self-hosted we will save and hide the token.
98    // rawurlencode the redirect before nesting it: it is already percent-encoded
99    // (e.g. an emoji or non-ASCII slug comes through as %F0%9F%8C%91), and add_query_arg
100    // does not encode the values it inserts. Without this extra layer the value is
101    // over-decoded to raw bytes by the time it reaches the subscribers/auth endpoint,
102    // which strips it and 404s. See NL-273.
103    $redirect_url = get_site_url() . '/wp-json/jetpack/v4/subscribers/auth';
104    $redirect_url = add_query_arg( 'redirect_url', rawurlencode( $redirect ), $redirect_url );
105
106    return add_query_arg(
107        array(
108            'site_id'      => intval( Jetpack_Options::get_option( 'id' ) ),
109            'redirect_url' => rawurlencode( $redirect_url ),
110        ),
111        'https://subscribe.wordpress.com/memberships/jwt/'
112    );
113}
114
115/**
116 * Determines whether the visitor has a subscriber session for the login UI.
117 *
118 * WordPress sessions count on Simple; other hosts require the subscriber cookie.
119 * Content access validates the token separately.
120 *
121 * @return bool
122 */
123function is_subscriber_logged_in() {
124    return ( ( new Host() )->is_wpcom_simple() && is_user_logged_in() ) || Abstract_Token_Subscription_Service::has_token_from_cookie();
125}
126
127/**
128 * Renders Subscriber Login block.
129 *
130 * @param array $attributes The block attributes.
131 *
132 * @return string
133 */
134function render_block( $attributes ) {
135    Jetpack_Gutenberg::load_assets_as_required( __DIR__ );
136
137    $block_template             = '<div %1$s><a href="%2$s">%3$s</a></div>';
138    $redirect_url               = ! empty( $attributes['redirectToCurrent'] ) ? get_current_url() : get_site_url();
139    $log_in_label               = ! empty( $attributes['logInLabel'] ) ? sanitize_text_field( $attributes['logInLabel'] ) : esc_html__( 'Log in', 'jetpack' );
140    $log_out_label              = ! empty( $attributes['logOutLabel'] ) ? sanitize_text_field( $attributes['logOutLabel'] ) : esc_html__( 'Log out', 'jetpack' );
141    $show_manage_link           = ! empty( $attributes['showManageSubscriptionsLink'] );
142    $manage_subscriptions_label = ! empty( $attributes['manageSubscriptionsLabel'] ) ? sanitize_text_field( $attributes['manageSubscriptionsLabel'] ) : esc_html__( 'Manage subscription', 'jetpack' );
143
144    if ( ! is_subscriber_logged_in() ) {
145        return sprintf(
146            $block_template,
147            get_block_wrapper_attributes(),
148            get_subscriber_login_url( $redirect_url ),
149            $log_in_label
150        );
151    }
152
153    if ( $show_manage_link && Jetpack_Memberships::is_current_user_subscribed() ) {
154        return sprintf(
155            $block_template,
156            get_block_wrapper_attributes(),
157            'https://wordpress.com/reader/site/subscription/' . Jetpack_Memberships::get_blog_id(),
158            $manage_subscriptions_label
159        );
160    }
161
162    return sprintf(
163        $block_template,
164        get_block_wrapper_attributes(),
165        wp_logout_url( $redirect_url ),
166        $log_out_label
167    );
168}