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wp-content/plugins/jetpack/extensions/blocks/premium-content/login-button/login-button.php

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+<?php
+/**
+ * Premium Content Login Button Child Block.
+ *
+ * @package automattic/jetpack
+ */
+
+namespace Automattic\Jetpack\Extensions\Premium_Content;
+
+use Automattic\Jetpack\Blocks;
+use Automattic\Jetpack\Extensions\Premium_Content\Subscription_Service\Abstract_Token_Subscription_Service;
+use Automattic\Jetpack\Status\Host;
+use Jetpack_Gutenberg;
+use Jetpack_Options;
+
+require_once dirname( __DIR__ ) . '/_inc/subscription-service/include.php';
+
+const LOGIN_BUTTON_NAME = 'premium-content/login-button';
+
+/**
+ * Registers the block for use in Gutenberg
+ * This is done via an action so that we can disable
+ * registration if we need to.
+ */
+function register_login_button_block() {
+	Blocks::jetpack_register_block(
+		LOGIN_BUTTON_NAME,
+		array(
+			'render_callback'       => __NAMESPACE__ . '\render_login_button_block',
+			'render_email_callback' => __NAMESPACE__ . '\render_login_button_block_email',
+		)
+	);
+}
+add_action( 'init', __NAMESPACE__ . '\register_login_button_block' );
+
+/**
+ * Returns current URL.
+ *
+ * @return string
+ */
+function get_current_url() {
+	if ( ! isset( $_SERVER['HTTP_HOST'] ) || ! isset( $_SERVER['REQUEST_URI'] ) ) {
+		return '';
+	}
+
+	return ( is_ssl() ? 'https://' : 'http://' ) . wp_unslash( $_SERVER['HTTP_HOST'] ) . wp_unslash( $_SERVER['REQUEST_URI'] ); // phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized
+}
+
+/**
+ * Returns subscriber log in URL.
+ *
+ * @param string $redirect Path to redirect to on login.
+ *
+ * @return string
+ */
+function get_subscriber_login_url( $redirect ) {
+	$redirect = ! empty( $redirect ) ? $redirect : get_site_url();
+
+	if ( ( new Host() )->is_wpcom_simple() ) {
+		// On WPCOM we will redirect immediately
+		return wpcom_logmein_redirect_url( $redirect, false, null, 'link', get_current_blog_id() );
+	}
+
+	// On self-hosted we will save and hide the token
+	$redirect_url = get_site_url() . '/wp-json/jetpack/v4/subscribers/auth';
+	$redirect_url = add_query_arg( 'redirect_url', $redirect, $redirect_url );
+
+	return add_query_arg(
+		array(
+			'site_id'      => intval( Jetpack_Options::get_option( 'id' ) ),
+			'redirect_url' => rawurlencode( $redirect_url ),
+		),
+		'https://subscribe.wordpress.com/memberships/jwt/'
+	);
+}
+
+/**
+ * Determines whether the current visitor is a logged in user or a subscriber.
+ *
+ * @return bool
+ */
+function is_subscriber_logged_in() {
+	return is_user_logged_in() || Abstract_Token_Subscription_Service::has_token_from_cookie();
+}
+
+/**
+ * Render callback.
+ *
+ * @param array  $attributes Array containing the block attributes.
+ * @param string $content    String containing the block content.
+ *
+ * @return string
+ */
+function render_login_button_block( $attributes, $content ) {
+	if ( ! pre_render_checks() ) {
+		return '';
+	}
+
+	// The viewer is logged it, so they shouldn't see the login button.
+	if ( is_subscriber_logged_in() ) {
+		return '';
+	}
+
+	Jetpack_Gutenberg::load_styles_as_required( LOGIN_BUTTON_NAME );
+
+	$redirect_url = get_current_url();
+	$url          = get_subscriber_login_url( $redirect_url );
+
+	return preg_replace( '/(<a\b[^><]*)>/i', '$1 href="' . esc_url( $url ) . '">', $content );
+}
+
+/**
+ * Render email callback.
+ *
+ * @return string
+ */
+function render_login_button_block_email() {
+	// We don't want to render the login button in emails.
+	// The subscriber is already considered logged in in emails.
+	return '';
+}