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<?php
/**
* Response handler for Ajax requests.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
* http://www.gnu.org/copyleft/gpl.html
*
* @file
* @ingroup Ajax
*/
/**
* Handle responses for Ajax requests (send headers, print
* content, that sort of thing)
*
* @ingroup Ajax
*/
class AjaxResponse {
/**
* Number of seconds to get the response cached by a proxy
* @var int $mCacheDuration
*/
private $mCacheDuration;
/**
* HTTP header Content-Type
* @var string $mContentType
*/
private $mContentType;
/**
* Disables output. Can be set by calling $AjaxResponse->disable()
* @var bool $mDisabled
*/
private $mDisabled;
/**
* Date for the HTTP header Last-modified
* @var string|bool $mLastModified
*/
private $mLastModified;
/**
* HTTP response code
* @var string $mResponseCode
*/
private $mResponseCode;
/**
* HTTP Vary header
* @var string $mVary
*/
private $mVary;
/**
* Content of our HTTP response
* @var string $mText
*/
private $mText;
/**
* @var Config
*/
private $mConfig;
/**
* @param string|null $text
* @param Config|null $config
*/
function __construct( $text = null, Config $config = null ) {
$this->mCacheDuration = null;
$this->mVary = null;
$this->mConfig = $config ?: ConfigFactory::getDefaultInstance()->makeConfig( 'main' );
$this->mDisabled = false;
$this->mText = '';
$this->mResponseCode = 200;
$this->mLastModified = false;
$this->mContentType = 'application/x-wiki';
if ( $text ) {
$this->addText( $text );
}
}
/**
* Set the number of seconds to get the response cached by a proxy
* @param int $duration
*/
function setCacheDuration( $duration ) {
$this->mCacheDuration = $duration;
}
/**
* Set the HTTP Vary header
* @param string $vary
*/
function setVary( $vary ) {
$this->mVary = $vary;
}
/**
* Set the HTTP response code
* @param string $code
*/
function setResponseCode( $code ) {
$this->mResponseCode = $code;
}
/**
* Set the HTTP header Content-Type
* @param string $type
*/
function setContentType( $type ) {
$this->mContentType = $type;
}
/**
* Disable output.
*/
function disable() {
$this->mDisabled = true;
}
/**
* Add content to the response
* @param string $text
*/
function addText( $text ) {
if ( !$this->mDisabled && $text ) {
$this->mText .= $text;
}
}
/**
* Output text
*/
function printText() {
if ( !$this->mDisabled ) {
print $this->mText;
}
}
/**
* Construct the header and output it
*/
function sendHeaders() {
if ( $this->mResponseCode ) {
// For back-compat, it is supported that mResponseCode be a string like " 200 OK"
// (with leading space and the status message after). Cast response code to an integer
// to take advantage of PHP's conversion rules which will turn " 200 OK" into 200.
// http://php.net/string#language.types.string.conversion
$n = intval( trim( $this->mResponseCode ) );
HttpStatus::header( $n );
}
header( "Content-Type: " . $this->mContentType );
if ( $this->mLastModified ) {
header( "Last-Modified: " . $this->mLastModified );
} else {
header( "Last-Modified: " . gmdate( "D, d M Y H:i:s" ) . " GMT" );
}
if ( $this->mCacheDuration ) {
# If CDN caches are configured, tell them to cache the response,
# and tell the client to always check with the CDN. Otherwise,
# tell the client to use a cached copy, without a way to purge it.
if ( $this->mConfig->get( 'UseSquid' ) ) {
# Expect explicit purge of the proxy cache, but require end user agents
# to revalidate against the proxy on each visit.
# Surrogate-Control controls our CDN, Cache-Control downstream caches
if ( $this->mConfig->get( 'UseESI' ) ) {
header( 'Surrogate-Control: max-age=' . $this->mCacheDuration . ', content="ESI/1.0"' );
header( 'Cache-Control: s-maxage=0, must-revalidate, max-age=0' );
} else {
header( 'Cache-Control: s-maxage=' . $this->mCacheDuration . ', must-revalidate, max-age=0' );
}
} else {
# Let the client do the caching. Cache is not purged.
header( "Expires: " . gmdate( "D, d M Y H:i:s", time() + $this->mCacheDuration ) . " GMT" );
header( "Cache-Control: s-maxage={$this->mCacheDuration}," .
"public,max-age={$this->mCacheDuration}" );
}
} else {
# always expired, always modified
header( "Expires: Mon, 26 Jul 1997 05:00:00 GMT" ); // Date in the past
header( "Cache-Control: no-cache, must-revalidate" ); // HTTP/1.1
header( "Pragma: no-cache" ); // HTTP/1.0
}
if ( $this->mVary ) {
header( "Vary: " . $this->mVary );
}
}
/**
* checkLastModified tells the client to use the client-cached response if
* possible. If successful, the AjaxResponse is disabled so that
* any future call to AjaxResponse::printText() have no effect.
*
* @param string $timestamp
* @return bool Returns true if the response code was set to 304 Not Modified.
*/
function checkLastModified( $timestamp ) {
global $wgCachePages, $wgCacheEpoch, $wgUser;
$fname = 'AjaxResponse::checkLastModified';
if ( !$timestamp || $timestamp == '19700101000000' ) {
wfDebug( "$fname: CACHE DISABLED, NO TIMESTAMP", 'private' );
return false;
}
if ( !$wgCachePages ) {
wfDebug( "$fname: CACHE DISABLED", 'private' );
return false;
}
$timestamp = wfTimestamp( TS_MW, $timestamp );
$lastmod = wfTimestamp( TS_RFC2822, max( $timestamp, $wgUser->getTouched(), $wgCacheEpoch ) );
if ( !empty( $_SERVER['HTTP_IF_MODIFIED_SINCE'] ) ) {
# IE sends sizes after the date like this:
# Wed, 20 Aug 2003 06:51:19 GMT; length=5202
# this breaks strtotime().
$modsince = preg_replace( '/;.*$/', '', $_SERVER["HTTP_IF_MODIFIED_SINCE"] );
$modsinceTime = strtotime( $modsince );
$ismodsince = wfTimestamp( TS_MW, $modsinceTime ? $modsinceTime : 1 );
wfDebug( "$fname: -- client send If-Modified-Since: $modsince", 'private' );
wfDebug( "$fname: -- we might send Last-Modified : $lastmod", 'private' );
if ( ( $ismodsince >= $timestamp )
&& $wgUser->validateCache( $ismodsince ) &&
$ismodsince >= $wgCacheEpoch
) {
ini_set( 'zlib.output_compression', 0 );
$this->setResponseCode( 304 );
$this->disable();
$this->mLastModified = $lastmod;
wfDebug( "$fname: CACHED client: $ismodsince ; user: {$wgUser->getTouched()} ; " .
"page: $timestamp ; site $wgCacheEpoch", 'private' );
return true;
} else {
wfDebug( "$fname: READY client: $ismodsince ; user: {$wgUser->getTouched()} ; " .
"page: $timestamp ; site $wgCacheEpoch", 'private' );
$this->mLastModified = $lastmod;
}
} else {
wfDebug( "$fname: client did not send If-Modified-Since header", 'private' );
$this->mLastModified = $lastmod;
}
return false;
}
/**
* @param string $mckey
* @param int $touched
* @return bool
*/
function loadFromMemcached( $mckey, $touched ) {
if ( !$touched ) {
return false;
}
$mcvalue = ObjectCache::getMainWANInstance()->get( $mckey );
if ( $mcvalue ) {
# Check to see if the value has been invalidated
if ( $touched <= $mcvalue['timestamp'] ) {
wfDebug( "Got $mckey from cache" );
$this->mText = $mcvalue['value'];
return true;
} else {
wfDebug( "$mckey has expired" );
}
}
return false;
}
/**
* @param string $mckey
* @param int $expiry
* @return bool
*/
function storeInMemcached( $mckey, $expiry = 86400 ) {
ObjectCache::getMainWANInstance()->set( $mckey,
[
'timestamp' => wfTimestampNow(),
'value' => $this->mText
], $expiry
);
return true;
}
}