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| 1 | <?php |
| 2 | /** |
| 3 | * The actual logging in functionality of the plugin. |
| 4 | * |
| 5 | * Distinct from login UI. |
| 6 | * |
| 7 | * @link https://BrianHenry.ie |
| 8 | * @since 1.0.0 |
| 9 | * |
| 10 | * @package brianhenryie/bh-wp-autologin-urls |
| 11 | */ |
| 12 | |
| 13 | namespace BrianHenryIE\WP_Autologin_URLs\WP_Includes; |
| 14 | |
| 15 | use BrianHenryIE\WP_Autologin_URLs\API_Interface; |
| 16 | use BrianHenryIE\WP_Autologin_URLs\API\Integrations\User_Finder_Factory; |
| 17 | use BrianHenryIE\WP_Autologin_URLs\Settings_Interface; |
| 18 | use BrianHenryIE\WP_Autologin_URLs\WooCommerce\Checkout; |
| 19 | use Psr\Log\LoggerAwareTrait; |
| 20 | use Psr\Log\LoggerInterface; |
| 21 | use WP_User; |
| 22 | |
| 23 | /** |
| 24 | * The actual logging-in functionality of the plugin. |
| 25 | */ |
| 26 | class Login { |
| 27 | |
| 28 | use LoggerAwareTrait; |
| 29 | |
| 30 | const MAX_BAD_LOGIN_ATTEMPTS = 5; |
| 31 | const MAX_BAD_LOGIN_PERIOD_SECONDS = 60 * 60 * 24; // Aka DAY_IN_SECONDS. |
| 32 | |
| 33 | /** |
| 34 | * Not in use? |
| 35 | * |
| 36 | * @var Settings_Interface |
| 37 | */ |
| 38 | protected Settings_Interface $settings; |
| 39 | |
| 40 | /** |
| 41 | * Core API methods for verifying autologin querystring. |
| 42 | * |
| 43 | * @var API_Interface |
| 44 | */ |
| 45 | protected API_Interface $api; |
| 46 | |
| 47 | /** |
| 48 | * This plugin can parse URLs for MailPoet, The Newsletter Plugin, and Klaviyo, and AutologinUrls own |
| 49 | * querystring parameter. The factory returns valid User_Finders for each. |
| 50 | * |
| 51 | * @var User_Finder_Factory |
| 52 | */ |
| 53 | protected User_Finder_Factory $user_finder_factory; |
| 54 | |
| 55 | /** |
| 56 | * Initialize the class and set its properties. |
| 57 | * |
| 58 | * @param API_Interface $api The core plugin functions. |
| 59 | * @param Settings_Interface $settings The plugin's settings. |
| 60 | * @param LoggerInterface $logger The logger instance. |
| 61 | * @param ?User_Finder_Factory $user_finder_factory Factory to return a class that can determine the user from the URL. |
| 62 | * |
| 63 | * @since 1.0.0 |
| 64 | */ |
| 65 | public function __construct( API_Interface $api, Settings_Interface $settings, LoggerInterface $logger, ?User_Finder_Factory $user_finder_factory = null ) { |
| 66 | $this->setLogger( $logger ); |
| 67 | |
| 68 | $this->settings = $settings; |
| 69 | $this->api = $api; |
| 70 | |
| 71 | $this->user_finder_factory = $user_finder_factory ?? new User_Finder_Factory( $this->api, $this->settings, $this->logger ); |
| 72 | } |
| 73 | |
| 74 | /** |
| 75 | * The primary handler of the plugin, that reads the request querystring and checks it for autologin parameters. |
| 76 | * |
| 77 | * @hooked determine_current_user |
| 78 | * |
| 79 | * @param int|bool $user_id The already determined user ID, or false if none. |
| 80 | * @return int|bool |
| 81 | */ |
| 82 | public function process( $user_id ) { |
| 83 | |
| 84 | remove_action( 'determine_current_user', array( $this, 'process' ), 30 ); |
| 85 | |
| 86 | // If we're logged in already, or there's no querystring to parse, just return. |
| 87 | // phpcs:ignore WordPress.Security.NonceVerification.Recommended |
| 88 | if ( $user_id || empty( $_GET ) ) { |
| 89 | return $user_id; |
| 90 | } |
| 91 | |
| 92 | // Check for bots. |
| 93 | // Use the null coalescing operator to ensure $user_agent is always a string. |
| 94 | // This prevents passing null to strpos, which is deprecated in newer PHP versions. |
| 95 | $user_agent = filter_input( INPUT_SERVER, 'HTTP_USER_AGENT' ) ?? ''; |
| 96 | $bot = false !== strpos( $user_agent, 'bot' ); |
| 97 | if ( $bot ) { |
| 98 | return $user_id; |
| 99 | } |
| 100 | |
| 101 | // Maybe use a cookie to only use an autologin URL once every x minutes. |
| 102 | |
| 103 | // Checks does the querystring contain an autologin parameter. |
| 104 | $user_finder = $this->user_finder_factory->get_user_finder(); |
| 105 | |
| 106 | if ( is_null( $user_finder ) ) { |
| 107 | // No querystring was present, this was not an attempt to log in. |
| 108 | return $user_id; |
| 109 | } |
| 110 | |
| 111 | $user_array = $user_finder->get_wp_user_array(); |
| 112 | |
| 113 | if ( isset( $user_array['wp_user'] ) && $user_array['wp_user'] instanceof WP_User ) { |
| 114 | $this->logger->debug( "Found `wp_user:{$user_array['wp_user']->ID}`." ); |
| 115 | $wp_user = $user_array['wp_user']; |
| 116 | $user_id = $wp_user->ID; |
| 117 | } elseif ( ! empty( $user_array['user_data'] ) ) { |
| 118 | // If no WP_User account was found, but other user data was found that could be used for WooCommerce, prepopulate the checkout fields. |
| 119 | $this->logger->debug( 'No wp_user found, preloading WooCommerce fields.', $user_array ); |
| 120 | $prefill_checkout_fields = function () use ( $user_array ) { |
| 121 | $woocommerce_checkout = new Checkout( $this->logger ); |
| 122 | $woocommerce_checkout->prefill_checkout_fields( $user_array['user_data'] ); |
| 123 | }; |
| 124 | if ( did_action( 'woocommerce_init' ) ) { |
| 125 | $prefill_checkout_fields(); |
| 126 | } else { |
| 127 | add_action( 'woocommerce_init', $prefill_checkout_fields ); |
| 128 | } |
| 129 | return $user_id; |
| 130 | } else { |
| 131 | $this->logger->debug( 'Could not find wp_user or user data using request URL.' ); |
| 132 | return $user_id; |
| 133 | } |
| 134 | |
| 135 | $ip_address = $this->api->get_ip_address(); |
| 136 | |
| 137 | if ( empty( $ip_address ) ) { |
| 138 | // This would be empty during cron jobs and WP CLI. |
| 139 | return $user_id; |
| 140 | } |
| 141 | |
| 142 | // Log each attempt to log in, prevent too many attempts by any one IP. |
| 143 | if ( ! $this->api->should_allow_login_attempt( "ip:{$ip_address}" ) ) { |
| 144 | return $user_id; |
| 145 | } |
| 146 | |
| 147 | // Rate limit too many failed attempts at logging in the one user. |
| 148 | if ( ! $this->api->should_allow_login_attempt( "wp_user:{$wp_user->ID}" ) ) { |
| 149 | return $user_id; |
| 150 | } |
| 151 | |
| 152 | /** |
| 153 | * Although cookies will be set in a moment, they won't be available in the `$_COOKIE` array, |
| 154 | * and they need to be to log into wp-admin via the autologin URL. |
| 155 | * |
| 156 | * @see wp-admin/admin.php |
| 157 | * @see auth_redirect() |
| 158 | * @see wp_parse_auth_cookie() |
| 159 | */ |
| 160 | add_action( |
| 161 | 'set_auth_cookie', |
| 162 | function ( $auth_cookie ) { |
| 163 | global $_COOKIE; |
| 164 | $_COOKIE[ AUTH_COOKIE ] = $auth_cookie; |
| 165 | $_COOKIE[ SECURE_AUTH_COOKIE ] = $auth_cookie; |
| 166 | } |
| 167 | ); |
| 168 | |
| 169 | add_action( |
| 170 | 'set_logged_in_cookie', |
| 171 | function ( $logged_in_cookie ) { |
| 172 | global $_COOKIE; |
| 173 | $_COOKIE[ LOGGED_IN_COOKIE ] = $logged_in_cookie; |
| 174 | } |
| 175 | ); |
| 176 | |
| 177 | // @see https://developer.wordpress.org/reference/functions/wp_set_current_user/ |
| 178 | wp_set_current_user( $wp_user->ID, $wp_user->user_login ); |
| 179 | wp_set_auth_cookie( $wp_user->ID ); |
| 180 | add_action( |
| 181 | 'init', |
| 182 | function () use ( $wp_user ) { |
| 183 | do_action( 'wp_login', $wp_user->user_login, $wp_user ); |
| 184 | } |
| 185 | ); |
| 186 | |
| 187 | $this->logger->info( "User wp_user:{$wp_user->ID} logged in via {$user_array['source']}." ); |
| 188 | |
| 189 | $this->maybe_redirect(); |
| 190 | |
| 191 | return $user_id; |
| 192 | } |
| 193 | |
| 194 | /** |
| 195 | * If the request is for wp-login.php, we should redirect to home or to the specified redirect_to url. |
| 196 | */ |
| 197 | protected function maybe_redirect(): void { |
| 198 | |
| 199 | if ( ! isset( $_SERVER['REQUEST_URI'] ) ) { |
| 200 | // Cron, WP CLI. |
| 201 | return; |
| 202 | } |
| 203 | |
| 204 | $request_uri = esc_url_raw( wp_unslash( $_SERVER['REQUEST_URI'] ) ); |
| 205 | |
| 206 | // Check is the requested URL wp-login.php. Otherwise we don't want to redirect. |
| 207 | $wp_login_endpoint = str_replace( get_site_url(), '', wp_login_url() ); |
| 208 | if ( ! stristr( $request_uri, $wp_login_endpoint ) ) { |
| 209 | return; |
| 210 | } |
| 211 | |
| 212 | // Check we're on wp-login.php?redirect_to=... |
| 213 | // We won't have a nonce here if the link is from an email. |
| 214 | // phpcs:disable WordPress.Security.NonceVerification.Recommended |
| 215 | if ( isset( $_GET['redirect_to'] ) ) { |
| 216 | |
| 217 | $url = filter_var( wp_unslash( $_GET['redirect_to'] ), FILTER_SANITIZE_STRING ); |
| 218 | if ( false === $url ) { |
| 219 | return; |
| 220 | } |
| 221 | $redirect_to = urldecode( $url ); |
| 222 | |
| 223 | } else { |
| 224 | // TODO: There's a filter determining what the destination URL should be when logging in a user. |
| 225 | $redirect_to = get_site_url(); |
| 226 | } |
| 227 | |
| 228 | if ( wp_safe_redirect( $redirect_to ) ) { |
| 229 | exit(); |
| 230 | } |
| 231 | } |
| 232 | } |