recaptcha.php
| 1 | <?php |
| 2 | |
| 3 | /** |
| 4 | * Class that handles reCAPTCHA. |
| 5 | */ |
| 6 | class Jetpack_ReCaptcha { |
| 7 | |
| 8 | /** |
| 9 | * URL to which requests are POSTed. |
| 10 | * |
| 11 | * @const string |
| 12 | */ |
| 13 | const VERIFY_URL = 'https://www.google.com/recaptcha/api/siteverify'; |
| 14 | |
| 15 | /** |
| 16 | * Site key to use in HTML code. |
| 17 | * |
| 18 | * @var string |
| 19 | */ |
| 20 | private $site_key; |
| 21 | |
| 22 | /** |
| 23 | * Shared secret for the site. |
| 24 | * |
| 25 | * @var string |
| 26 | */ |
| 27 | private $secret_key; |
| 28 | |
| 29 | /** |
| 30 | * Config for reCAPTCHA instance. |
| 31 | * |
| 32 | * @var array |
| 33 | */ |
| 34 | private $config; |
| 35 | |
| 36 | /** |
| 37 | * Error codes returned from reCAPTCHA API. |
| 38 | * |
| 39 | * @see https://developers.google.com/recaptcha/docs/verify |
| 40 | * |
| 41 | * @var array |
| 42 | */ |
| 43 | private $error_codes; |
| 44 | |
| 45 | /** |
| 46 | * Create a configured instance to use the reCAPTCHA service. |
| 47 | * |
| 48 | * @param string $site_key Site key to use in HTML code. |
| 49 | * @param string $secret_key Shared secret between site and reCAPTCHA server. |
| 50 | * @param array $config Config array to optionally configure reCAPTCHA instance. |
| 51 | */ |
| 52 | public function __construct( $site_key, $secret_key, $config = array() ) { |
| 53 | $this->site_key = $site_key; |
| 54 | $this->secret_key = $secret_key; |
| 55 | $this->config = wp_parse_args( $config, $this->get_default_config() ); |
| 56 | |
| 57 | $this->error_codes = array( |
| 58 | 'missing-input-secret' => __( 'The secret parameter is missing', 'jetpack' ), |
| 59 | 'invalid-input-secret' => __( 'The secret parameter is invalid or malformed', 'jetpack' ), |
| 60 | 'missing-input-response' => __( 'The response parameter is missing', 'jetpack' ), |
| 61 | 'invalid-input-response' => __( 'The response parameter is invalid or malformed', 'jetpack' ), |
| 62 | 'invalid-json' => __( 'Invalid JSON', 'jetpack' ), |
| 63 | 'unexpected-response' => __( 'Unexpected response', 'jetpack' ), |
| 64 | 'unexpected-hostname' => __( 'Unexpected hostname', 'jetpack' ), |
| 65 | ); |
| 66 | } |
| 67 | |
| 68 | /** |
| 69 | * Get default config for this reCAPTCHA instance. |
| 70 | * |
| 71 | * @return array Default config |
| 72 | */ |
| 73 | public function get_default_config() { |
| 74 | return array( |
| 75 | 'language' => get_locale(), |
| 76 | 'script_async' => true, |
| 77 | 'tag_class' => 'g-recaptcha', |
| 78 | 'tag_attributes' => array( |
| 79 | 'theme' => 'light', |
| 80 | 'type' => 'image', |
| 81 | 'tabindex' => 0, |
| 82 | ), |
| 83 | ); |
| 84 | } |
| 85 | |
| 86 | /** |
| 87 | * Calls the reCAPTCHA siteverify API to verify whether the user passes |
| 88 | * CAPTCHA test. |
| 89 | * |
| 90 | * @param string $response The value of 'g-recaptcha-response' in the submitted |
| 91 | * form. |
| 92 | * @param string $remote_ip The end user's IP address. |
| 93 | * |
| 94 | * @return bool|WP_Error Returns true if verified. Otherwise WP_Error is returned. |
| 95 | */ |
| 96 | public function verify( $response, $remote_ip ) { |
| 97 | // No need make a request if response is empty. |
| 98 | if ( empty( $response ) ) { |
| 99 | return new WP_Error( 'missing-input-response', $this->error_codes['missing-input-response'], 400 ); |
| 100 | } |
| 101 | |
| 102 | $resp = wp_remote_post( self::VERIFY_URL, $this->get_verify_request_params( $response, $remote_ip ) ); |
| 103 | if ( is_wp_error( $resp ) ) { |
| 104 | return $resp; |
| 105 | } |
| 106 | |
| 107 | $resp_decoded = json_decode( wp_remote_retrieve_body( $resp ), true ); |
| 108 | if ( ! $resp_decoded ) { |
| 109 | return new WP_Error( 'invalid-json', $this->error_codes['invalid-json'], 400 ); |
| 110 | } |
| 111 | |
| 112 | // Default error code and message. |
| 113 | $error_code = 'unexpected-response'; |
| 114 | $error_message = $this->error_codes['unexpected-response']; |
| 115 | |
| 116 | // Use the first error code if exists. |
| 117 | if ( isset( $resp_decoded['error-codes'] ) && is_array( $resp_decoded['error-codes'] ) ) { |
| 118 | if ( isset( $resp_decoded['error-codes'][0] ) && isset( $this->error_codes[ $resp_decoded['error-codes'][0] ] ) ) { |
| 119 | $error_message = $this->error_codes[ $resp_decoded['error-codes'][0] ]; |
| 120 | $error_code = $resp_decoded['error-codes'][0]; |
| 121 | } |
| 122 | } |
| 123 | |
| 124 | if ( ! isset( $resp_decoded['success'] ) ) { |
| 125 | return new WP_Error( $error_code, $error_message ); |
| 126 | } |
| 127 | |
| 128 | if ( true !== $resp_decoded['success'] ) { |
| 129 | return new WP_Error( $error_code, $error_message ); |
| 130 | } |
| 131 | |
| 132 | // Validate the hostname matches expected source |
| 133 | if ( isset( $resp_decoded['hostname'] ) ) { |
| 134 | $url = wp_parse_url( get_home_url() ); |
| 135 | if ( $url['host'] !== $resp_decoded['hostname'] ) { |
| 136 | return new WP_Error( 'unexpected-host', $this->error_codes['unexpected-hostname'] ); |
| 137 | } |
| 138 | } |
| 139 | |
| 140 | return true; |
| 141 | } |
| 142 | |
| 143 | /** |
| 144 | * Get siteverify request parameters. |
| 145 | * |
| 146 | * @param string $response The value of 'g-recaptcha-response' in the submitted |
| 147 | * form. |
| 148 | * @param string $remote_ip The end user's IP address. |
| 149 | * |
| 150 | * @return array |
| 151 | */ |
| 152 | public function get_verify_request_params( $response, $remote_ip ) { |
| 153 | return array( |
| 154 | 'body' => array( |
| 155 | 'secret' => $this->secret_key, |
| 156 | 'response' => $response, |
| 157 | 'remoteip' => $remote_ip, |
| 158 | ), |
| 159 | 'sslverify' => true, |
| 160 | ); |
| 161 | } |
| 162 | |
| 163 | /** |
| 164 | * Get reCAPTCHA HTML to render. |
| 165 | * |
| 166 | * @return string |
| 167 | */ |
| 168 | public function get_recaptcha_html() { |
| 169 | return sprintf( |
| 170 | ' |
| 171 | <div |
| 172 | class="%s" |
| 173 | data-sitekey="%s" |
| 174 | data-theme="%s" |
| 175 | data-type="%s" |
| 176 | data-tabindex="%s"></div> |
| 177 | <script type="text/javascript" src="https://www.google.com/recaptcha/api.js?hl=%s"%s></script> |
| 178 | ', |
| 179 | esc_attr( $this->config['tag_class'] ), |
| 180 | esc_attr( $this->site_key ), |
| 181 | esc_attr( $this->config['tag_attributes']['theme'] ), |
| 182 | esc_attr( $this->config['tag_attributes']['type'] ), |
| 183 | esc_attr( $this->config['tag_attributes']['tabindex'] ), |
| 184 | rawurlencode( $this->config['language'] ), |
| 185 | $this->config['script_async'] ? ' async' : '' |
| 186 | ); |
| 187 | } |
| 188 | } |
| 189 |