AjaxResponse.php

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<?php
use MediaWiki\MediaWikiServices;
 
class AjaxResponse {
    private $mCacheDuration;
 
    private $mContentType;
 
    private $mDisabled;
 
    private $mLastModified;
 
    private $mResponseCode;
 
    private $mVary;
 
    private $mText;
 
    private $mConfig;
 
    public function __construct( $text = null, Config $config = null ) {
        $this->mCacheDuration = null;
        $this->mVary = null;
        $this->mConfig = $config ?: MediaWikiServices::getInstance()->getMainConfig();
 
        $this->mDisabled = false;
        $this->mText = '';
        $this->mResponseCode = 200;
        $this->mLastModified = false;
        $this->mContentType = 'application/x-wiki';
 
        if ( $text ) {
            $this->addText( $text );
        }
    }
 
    public function setResponseCode( $code ) {
        $this->mResponseCode = $code;
    }
 
    public function setContentType( $type ) {
        $this->mContentType = $type;
    }
 
    public function disable() {
        $this->mDisabled = true;
    }
 
    public function addText( $text ) {
        if ( !$this->mDisabled && $text ) {
            $this->mText .= $text;
        }
    }
 
    public function printText() {
        if ( !$this->mDisabled ) {
            print $this->mText;
        }
    }
 
    public 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.
            // https://www.php.net/manual/en/language.types.string.php#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( 'UseCdn' ) ) {
                # Expect explicit purge of the proxy cache, but require end user agents
                # to revalidate against the proxy on each visit.
                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 );
        }
    }
}