includes/WebResponse.php

   1 <?php
   2 /**
   3  * Classes used to send headers and cookies back to the user
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  */
  22
  23 /**
  24  * Allow programs to request this object from WebRequest::response()
  25  * and handle all outputting (or lack of outputting) via it.
  26  * @ingroup HTTP
  27  */
  28 class WebResponse {
  29
  30         /** @var array Used to record set cookies, because PHP's setcookie() will
  31          * happily send an identical Set-Cookie to the client.
  32          */
  33         protected static $setCookies = [];
  34
  35         /**
  36          * Output an HTTP header, wrapper for PHP's header()
  37          * @param string $string Header to output
  38          * @param bool $replace Replace current similar header
  39          * @param null|int $http_response_code Forces the HTTP response code to the specified value.
  40          */
  41         public function header( $string, $replace = true, $http_response_code = null ) {
  42                 \MediaWiki\HeaderCallback::warnIfHeadersSent();
  43                 if ( $http_response_code ) {
  44                         header( $string, $replace, $http_response_code );
  45                 } else {
  46                         header( $string, $replace );
  47                 }
  48         }
  49
  50         /**
  51          * Get a response header
  52          * @param string $key The name of the header to get (case insensitive).
  53          * @return string|null The header value (if set); null otherwise.
  54          * @since 1.25
  55          */
  56         public function getHeader( $key ) {
  57                 foreach ( headers_list() as $header ) {
  58                         list( $name, $val ) = explode( ':', $header, 2 );
  59                         if ( !strcasecmp( $name, $key ) ) {
  60                                 return trim( $val );
  61                         }
  62                 }
  63                 return null;
  64         }
  65
  66         /**
  67          * Output an HTTP status code header
  68          * @since 1.26
  69          * @param int $code Status code
  70          */
  71         public function statusHeader( $code ) {
  72                 HttpStatus::header( $code );
  73         }
  74
  75         /**
  76          * Test if headers have been sent
  77          * @since 1.27
  78          * @return bool
  79          */
  80         public function headersSent() {
  81                 return headers_sent();
  82         }
  83
  84         /**
  85          * Set the browser cookie
  86          * @param string $name The name of the cookie.
  87          * @param string $value The value to be stored in the cookie.
  88          * @param int|null $expire Unix timestamp (in seconds) when the cookie should expire.
  89          *        0 (the default) causes it to expire $wgCookieExpiration seconds from now.
  90          *        null causes it to be a session cookie.
  91          * @param array $options Assoc of additional cookie options:
  92          *     prefix: string, name prefix ($wgCookiePrefix)
  93          *     domain: string, cookie domain ($wgCookieDomain)
  94          *     path: string, cookie path ($wgCookiePath)
  95          *     secure: bool, secure attribute ($wgCookieSecure)
  96          *     httpOnly: bool, httpOnly attribute ($wgCookieHttpOnly)
  97          * @since 1.22 Replaced $prefix, $domain, and $forceSecure with $options
  98          */
  99         public function setCookie( $name, $value, $expire = 0, $options = [] ) {
 100                 global $wgCookiePath, $wgCookiePrefix, $wgCookieDomain;
 101                 global $wgCookieSecure, $wgCookieExpiration, $wgCookieHttpOnly;
 102
 103                 $options = array_filter( $options, function ( $a ) {
 104                         return $a !== null;
 105                 } ) + [
 106                         'prefix' => $wgCookiePrefix,
 107                         'domain' => $wgCookieDomain,
 108                         'path' => $wgCookiePath,
 109                         'secure' => $wgCookieSecure,
 110                         'httpOnly' => $wgCookieHttpOnly,
 111                         'raw' => false,
 112                 ];
 113
 114                 if ( $expire === null ) {
 115                         $expire = 0; // Session cookie
 116                 } elseif ( $expire == 0 && $wgCookieExpiration != 0 ) {
 117                         $expire = time() + $wgCookieExpiration;
 118                 }
 119
 120                 $func = $options['raw'] ? 'setrawcookie' : 'setcookie';
 121
 122                 if ( Hooks::run( 'WebResponseSetCookie', [ &$name, &$value, &$expire, &$options ] ) ) {
 123                         $cookie = $options['prefix'] . $name;
 124                         $data = [
 125                                 'name' => (string)$cookie,
 126                                 'value' => (string)$value,
 127                                 'expire' => (int)$expire,
 128                                 'path' => (string)$options['path'],
 129                                 'domain' => (string)$options['domain'],
 130                                 'secure' => (bool)$options['secure'],
 131                                 'httpOnly' => (bool)$options['httpOnly'],
 132                         ];
 133
 134                         // Per RFC 6265, key is name + domain + path
 135                         $key = "{$data['name']}\n{$data['domain']}\n{$data['path']}";
 136
 137                         // If this cookie name was in the request, fake an entry in
 138                         // self::$setCookies for it so the deleting check works right.
 139                         if ( isset( $_COOKIE[$cookie] ) && !array_key_exists( $key, self::$setCookies ) ) {
 140                                 self::$setCookies[$key] = [];
 141                         }
 142
 143                         // PHP deletes if value is the empty string; also, a past expiry is deleting
 144                         $deleting = ( $data['value'] === '' || $data['expire'] > 0 && $data['expire'] <= time() );
 145
 146                         if ( $deleting && !isset( self::$setCookies[$key] ) ) { // isset( null ) is false
 147                                 wfDebugLog( 'cookie', 'already deleted ' . $func . ': "' . implode( '", "', $data ) . '"' );
 148                         } elseif ( !$deleting && isset( self::$setCookies[$key] ) &&
 149                                 self::$setCookies[$key] === [ $func, $data ]
 150                         ) {
 151                                 wfDebugLog( 'cookie', 'already set ' . $func . ': "' . implode( '", "', $data ) . '"' );
 152                         } else {
 153                                 wfDebugLog( 'cookie', $func . ': "' . implode( '", "', $data ) . '"' );
 154                                 if ( call_user_func_array( $func, array_values( $data ) ) ) {
 155                                         self::$setCookies[$key] = $deleting ? null : [ $func, $data ];
 156                                 }
 157                         }
 158                 }
 159         }
 160
 161         /**
 162          * Unset a browser cookie.
 163          * This sets the cookie with an empty value and an expiry set to a time in the past,
 164          * which will cause the browser to remove any cookie with the given name, domain and
 165          * path from its cookie store. Options other than these (and prefix) have no effect.
 166          * @param string $name Cookie name
 167          * @param array $options Cookie options, see {@link setCookie()}
 168          * @since 1.27
 169          */
 170         public function clearCookie( $name, $options = [] ) {
 171                 $this->setCookie( $name, '', time() - 31536000 /* 1 year */, $options );
 172         }
 173
 174         /**
 175          * Checks whether this request is performing cookie operations
 176          *
 177          * @return bool
 178          * @since 1.27
 179          */
 180         public function hasCookies() {
 181                 return (bool)self::$setCookies;
 182         }
 183 }
 184
 185 /**
 186  * @ingroup HTTP
 187  */
 188 class FauxResponse extends WebResponse {
 189         private $headers;
 190         private $cookies = [];
 191         private $code;
 192
 193         /**
 194          * Stores a HTTP header
 195          * @param string $string Header to output
 196          * @param bool $replace Replace current similar header
 197          * @param null|int $http_response_code Forces the HTTP response code to the specified value.
 198          */
 199         public function header( $string, $replace = true, $http_response_code = null ) {
 200                 if ( substr( $string, 0, 5 ) == 'HTTP/' ) {
 201                         $parts = explode( ' ', $string, 3 );
 202                         $this->code = intval( $parts[1] );
 203                 } else {
 204                         list( $key, $val ) = array_map( 'trim', explode( ":", $string, 2 ) );
 205
 206                         $key = strtoupper( $key );
 207
 208                         if ( $replace || !isset( $this->headers[$key] ) ) {
 209                                 $this->headers[$key] = $val;
 210                         }
 211                 }
 212
 213                 if ( $http_response_code !== null ) {
 214                         $this->code = intval( $http_response_code );
 215                 }
 216         }
 217
 218         /**
 219          * @since 1.26
 220          * @param int $code Status code
 221          */
 222         public function statusHeader( $code ) {
 223                 $this->code = intval( $code );
 224         }
 225
 226         public function headersSent() {
 227                 return false;
 228         }
 229
 230         /**
 231          * @param string $key The name of the header to get (case insensitive).
 232          * @return string|null The header value (if set); null otherwise.
 233          */
 234         public function getHeader( $key ) {
 235                 $key = strtoupper( $key );
 236
 237                 return $this->headers[$key] ?? null;
 238         }
 239
 240         /**
 241          * Get the HTTP response code, null if not set
 242          *
 243          * @return int|null
 244          */
 245         public function getStatusCode() {
 246                 return $this->code;
 247         }
 248
 249         /**
 250          * @param string $name The name of the cookie.
 251          * @param string $value The value to be stored in the cookie.
 252          * @param int|null $expire Ignored in this faux subclass.
 253          * @param array $options Ignored in this faux subclass.
 254          */
 255         public function setCookie( $name, $value, $expire = 0, $options = [] ) {
 256                 global $wgCookiePath, $wgCookiePrefix, $wgCookieDomain;
 257                 global $wgCookieSecure, $wgCookieExpiration, $wgCookieHttpOnly;
 258
 259                 $options = array_filter( $options, function ( $a ) {
 260                         return $a !== null;
 261                 } ) + [
 262                         'prefix' => $wgCookiePrefix,
 263                         'domain' => $wgCookieDomain,
 264                         'path' => $wgCookiePath,
 265                         'secure' => $wgCookieSecure,
 266                         'httpOnly' => $wgCookieHttpOnly,
 267                         'raw' => false,
 268                 ];
 269
 270                 if ( $expire === null ) {
 271                         $expire = 0; // Session cookie
 272                 } elseif ( $expire == 0 && $wgCookieExpiration != 0 ) {
 273                         $expire = time() + $wgCookieExpiration;
 274                 }
 275
 276                 $this->cookies[$options['prefix'] . $name] = [
 277                         'value' => (string)$value,
 278                         'expire' => (int)$expire,
 279                         'path' => (string)$options['path'],
 280                         'domain' => (string)$options['domain'],
 281                         'secure' => (bool)$options['secure'],
 282                         'httpOnly' => (bool)$options['httpOnly'],
 283                         'raw' => (bool)$options['raw'],
 284                 ];
 285         }
 286
 287         /**
 288          * @param string $name
 289          * @return string|null
 290          */
 291         public function getCookie( $name ) {
 292                 if ( isset( $this->cookies[$name] ) ) {
 293                         return $this->cookies[$name]['value'];
 294                 }
 295                 return null;
 296         }
 297
 298         /**
 299          * @param string $name
 300          * @return array|null
 301          */
 302         public function getCookieData( $name ) {
 303                 return $this->cookies[$name] ?? null;
 304         }
 305
 306         /**
 307          * @return array
 308          */
 309         public function getCookies() {
 310                 return $this->cookies;
 311         }
 312 }