login-button.php
141 lines
| 1 | <?php |
| 2 | /** |
| 3 | * Premium Content Login Button Child Block. |
| 4 | * |
| 5 | * @package automattic/jetpack |
| 6 | */ |
| 7 | |
| 8 | namespace Automattic\Jetpack\Extensions\Premium_Content; |
| 9 | |
| 10 | use Automattic\Jetpack\Blocks; |
| 11 | use Automattic\Jetpack\Extensions\Premium_Content\Subscription_Service\Abstract_Token_Subscription_Service; |
| 12 | use Automattic\Jetpack\Status\Host; |
| 13 | use Jetpack_Gutenberg; |
| 14 | use Jetpack_Options; |
| 15 | |
| 16 | require_once dirname( __DIR__ ) . '/_inc/subscription-service/include.php'; |
| 17 | |
| 18 | const LOGIN_BUTTON_NAME = 'premium-content/login-button'; |
| 19 | |
| 20 | /** |
| 21 | * Registers the block for use in Gutenberg |
| 22 | * This is done via an action so that we can disable |
| 23 | * registration if we need to. |
| 24 | */ |
| 25 | function register_login_button_block() { |
| 26 | Blocks::jetpack_register_block( |
| 27 | LOGIN_BUTTON_NAME, |
| 28 | array( |
| 29 | 'render_callback' => __NAMESPACE__ . '\render_login_button_block', |
| 30 | 'render_email_callback' => __NAMESPACE__ . '\render_login_button_block_email', |
| 31 | ) |
| 32 | ); |
| 33 | } |
| 34 | add_action( 'init', __NAMESPACE__ . '\register_login_button_block' ); |
| 35 | |
| 36 | /** |
| 37 | * Returns current URL. |
| 38 | * |
| 39 | * @return string |
| 40 | */ |
| 41 | function get_current_url() { |
| 42 | if ( ! isset( $_SERVER['HTTP_HOST'] ) || ! isset( $_SERVER['REQUEST_URI'] ) ) { |
| 43 | return ''; |
| 44 | } |
| 45 | |
| 46 | return ( is_ssl() ? 'https://' : 'http://' ) . wp_unslash( $_SERVER['HTTP_HOST'] ) . wp_unslash( $_SERVER['REQUEST_URI'] ); // phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized |
| 47 | } |
| 48 | |
| 49 | /** |
| 50 | * Returns subscriber log in URL. |
| 51 | * |
| 52 | * @param string $redirect Path to redirect to on login. |
| 53 | * |
| 54 | * @return string |
| 55 | */ |
| 56 | function get_subscriber_login_url( $redirect ) { |
| 57 | $redirect = ! empty( $redirect ) ? $redirect : get_site_url(); |
| 58 | |
| 59 | if ( ( new Host() )->is_wpcom_simple() ) { |
| 60 | // On WPCOM we will redirect immediately |
| 61 | return wpcom_logmein_redirect_url( $redirect, false, null, 'link', get_current_blog_id() ); |
| 62 | } |
| 63 | |
| 64 | // On self-hosted we will save and hide the token. |
| 65 | // rawurlencode the redirect before nesting it: it is already percent-encoded |
| 66 | // (e.g. an emoji or non-ASCII slug comes through as %F0%9F%8C%91), and add_query_arg |
| 67 | // does not encode the values it inserts. Without this extra layer the value is |
| 68 | // over-decoded to raw bytes by the time it reaches the subscribers/auth endpoint, |
| 69 | // which strips it and 404s. See NL-273. |
| 70 | $redirect_url = get_site_url() . '/wp-json/jetpack/v4/subscribers/auth'; |
| 71 | $redirect_url = add_query_arg( 'redirect_url', rawurlencode( $redirect ), $redirect_url ); |
| 72 | |
| 73 | return add_query_arg( |
| 74 | array( |
| 75 | 'site_id' => intval( Jetpack_Options::get_option( 'id' ) ), |
| 76 | 'redirect_url' => rawurlencode( $redirect_url ), |
| 77 | ), |
| 78 | 'https://subscribe.wordpress.com/memberships/jwt/' |
| 79 | ); |
| 80 | } |
| 81 | |
| 82 | /** |
| 83 | * Determines whether the current visitor is a confirmed subscriber -- someone who |
| 84 | * actually holds a premium-content session token, not merely someone with a |
| 85 | * WordPress session on this site. |
| 86 | * |
| 87 | * A bare WordPress session is not proof of a subscription (see NL-787): the |
| 88 | * previous is_user_logged_in() || has_token_from_cookie() check hid this block's |
| 89 | * only "Log in" link -- the sole way to mint a fresh token via the |
| 90 | * subscribe.wordpress.com magic-link round trip -- for anyone the site owner |
| 91 | * simply added as a WP user (or anyone else with an ordinary session and no |
| 92 | * token), leaving them with no way to recover. |
| 93 | * |
| 94 | * @return bool |
| 95 | */ |
| 96 | function is_subscriber_logged_in() { |
| 97 | return is_user_logged_in() && Abstract_Token_Subscription_Service::has_token_from_cookie(); |
| 98 | } |
| 99 | |
| 100 | /** |
| 101 | * Render callback. |
| 102 | * |
| 103 | * @param array $attributes Array containing the block attributes. |
| 104 | * @param string $content String containing the block content. |
| 105 | * |
| 106 | * @return string |
| 107 | */ |
| 108 | function render_login_button_block( $attributes, $content ) { |
| 109 | if ( ! pre_render_checks() ) { |
| 110 | return ''; |
| 111 | } |
| 112 | |
| 113 | // The viewer is logged it, so they shouldn't see the login button. |
| 114 | if ( is_subscriber_logged_in() ) { |
| 115 | return ''; |
| 116 | } |
| 117 | |
| 118 | Jetpack_Gutenberg::load_styles_as_required( LOGIN_BUTTON_NAME ); |
| 119 | |
| 120 | $redirect_url = get_current_url(); |
| 121 | $url = get_subscriber_login_url( $redirect_url ); |
| 122 | |
| 123 | $content = preg_replace( '/(<a\b[^><]*)>/i', '$1 href="' . esc_url( $url ) . '">', $content ); |
| 124 | |
| 125 | // Defense in depth: the label is inner block content (KSES-filtered on save for |
| 126 | // roles without `unfiltered_html`), but escape it again on output so a stored |
| 127 | // payload can never render as live markup. |
| 128 | return wp_kses_post( $content ); |
| 129 | } |
| 130 | |
| 131 | /** |
| 132 | * Render email callback. |
| 133 | * |
| 134 | * @return string |
| 135 | */ |
| 136 | function render_login_button_block_email() { |
| 137 | // We don't want to render the login button in emails. |
| 138 | // The subscriber is already considered logged in in emails. |
| 139 | return ''; |
| 140 | } |
| 141 |