app/community/core/image.php

<?php
/*========================================================================*\
|| ###################################################################### ||
|| # vBulletin 5.1.9 - Licence Number LD18132D6F
|| # ------------------------------------------------------------------ # ||
|| # Copyright 2000-2015 vBulletin Solutions Inc. All Rights Reserved.  # ||
|| # This file may not be redistributed in whole or significant part.   # ||
|| # ----------------- VBULLETIN IS NOT FREE SOFTWARE ----------------- # ||
|| # http://www.vbulletin.com | http://www.vbulletin.com/license.html   # ||
|| ###################################################################### ||
\*========================================================================*/

// ####################### SET PHP ENVIRONMENT ###########################
error_reporting(E_ALL & ~E_NOTICE);

// #################### DEFINE IMPORTANT CONSTANTS #######################
define('NOSHUTDOWNFUNC', 1);
define('NOCOOKIES', 1);
define('THIS_SCRIPT', 'image');
define('CSRF_PROTECTION', true);
define('VB_AREA', 'Forum');
define('NOPMPOPUP', 1);
if (!defined('VB_ENTRY'))
{
	define('VB_ENTRY', 1);
}

if ((!empty($_SERVER['HTTP_IF_MODIFIED_SINCE']) OR !empty($_SERVER['HTTP_IF_NONE_MATCH'])) AND $_GET['type'] != 'regcheck')
{
	// Don't check modify date as URLs contain unique items to nullify caching
	$sapi_name = php_sapi_name();
	if ($sapi_name == 'cgi' OR $sapi_name == 'cgi-fcgi')
	{
		header('Status: 304 Not Modified');
	}
	else
	{
		header('HTTP/1.1 304 Not Modified');
	}
	exit;
}

// #################### PRE-CACHE TEMPLATES AND DATA ######################
// get special phrase groups
$phrasegroups = array();

// get special data templates from the datastore
$specialtemplates = array();

// pre-cache templates used by all actions
$globaltemplates = array();

// pre-cache templates used by specific actions
$actiontemplates = array();

// ######################### REQUIRE BACK-END ############################
if ($_REQUEST['type'] == 'dberror') // do not require back-end
{
	header('Content-type: image/jpeg');
	readfile('./includes/database_error_image.jpg');
	exit;
}
else
{
	define('SKIP_SESSIONCREATE', 1);
	define('SKIP_USERINFO', 1);
	define('SKIP_DEFAULTDATASTORE', 1);
	define('CWD', (($getcwd = getcwd()) ? $getcwd : '.'));
	require_once(CWD . '/includes/init.php');
}

$vbulletin->input->clean_array_gpc('r', array(
	'type'   => vB_Cleaner::TYPE_STR,
	'thumb'   => vB_Cleaner::TYPE_BOOL,
	'userid' => vB_Cleaner::TYPE_UINT,
	'groupid' => vB_Cleaner::TYPE_UINT
));

// #######################################################################
// ######################## START MAIN SCRIPT ############################
// #######################################################################

if ($vbulletin->GPC['userid'] == 0 AND $vbulletin->GPC['groupid'] == 0)
{
	$vbulletin->GPC['type'] = 'hv';
}

if ($vbulletin->GPC['type'] == 'hv')
{
	$vbulletin->input->clean_array_gpc('r', array(
		'hash' => vB_Cleaner::TYPE_STR,
		'i'    => vB_Cleaner::TYPE_STR,
	));

	$moveabout = true;
	if ($vbulletin->GPC['hash'] == '' OR $vbulletin->GPC['hash'] == 'test' OR vB::getDatastore()->getOption('hv_type') != 'Image')
	{
		$imageinfo = array(
			'answer' => 'vBulletin',
		);

		$moveabout = $vbulletin->GPC['hash'] == 'test' ? true : false;
	}
	else if (!($imageinfo = vB::getDbAssertor()->getRow('humanverify', array('hash' => $vbulletin->GPC['hash'], 'viewed' => 0))))
	{
		header('Content-type: image/gif');
		readfile(DIR . '/' . vB::getDatastore()->getOption('cleargifurl'));
		exit;
	}
	else
	{
		$affected_rows = vB::getDbAssertor()->update('humanverify', array('viewed' => 1), array('hash' => $vbulletin->GPC['hash'], 'viewed' => 0));
		if ($affected_rows == 0)
		{	// image managed to get viewed by someone else between the $imageinfo query above and now
			header('Content-type: image/gif');
			readfile(DIR . '/' . vB::getDatastore()->getOption('cleargifurl'));
			exit;
		}
	}

	$image = vB_Image::instance();

	$imageInfo = $image->getImageFromString($imageinfo['answer'], $moveabout);

	header('Content-disposition: inline; filename=image.' . $imageInfo['filetype']);
	header('Content-transfer-encoding: binary');
	header('Content-Type: ' . $imageInfo['contentType']);
	header("Content-Length: " . $imageInfo['filesize']);
	echo $imageInfo['filedata'];
}
else if ($vbulletin->GPC['userid'])
{
	$vbulletin->input->clean_array_gpc('r', array(
		'dateline' => vB_Cleaner::TYPE_UINT,
	));

	$filedata = 'filedata';
	if ($vbulletin->GPC['type'] == 'profile')
	{
		$table = 'customavatar';
	}
	else if ($vbulletin->GPC['type'] == 'sigpic')
	{
		$table = 'sigpic';
	}
	else
	{
		$table = 'customavatar';
		if ($vbulletin->GPC['type'] == 'thumb' OR !empty($vbulletin->GPC['thumb']))
		{
			$filedata = 'filedata_thumb';
		}
	}

	$params['table'] = $table;
	$params['filedata'] = $filedata;
	$params['userid'] = $vbulletin->GPC['userid'];

	header('Cache-control: max-age=31536000');
	header('Expires: ' . gmdate('D, d M Y H:i:s', (TIMENOW + 31536000)) . ' GMT');
	if ($imageinfo = vB::getDbAssertor()->getRow('fetchImageInfo', $params))
	{
		header('Content-disposition: inline; filename=' . $imageinfo['filename']);
		header('Content-Length: ' . strlen($imageinfo['filedata']));
		header('ETag: "' . $imageinfo['dateline'] . '-' . $vbulletin->GPC['userid'] . '"');
		$extension = trim(substr(strrchr(strtolower($imageinfo['filename']), '.'), 1));
		if ($extension == 'jpg' OR $extension == 'jpeg')
		{
			header('Content-type: image/jpeg');
		}
		else if ($extension == 'png')
		{
			header('Content-type: image/png');
		}
		else
		{
			header('Content-type: image/gif');
		}
		echo $imageinfo['filedata'];
	}
	else
	{
		header('Content-disposition: inline; filename=default_avatar_large.png');
		header('Content-transfer-encoding: binary');
		header('Content-type: image/png');
		if ($filesize = @filesize(DIR . '/images/default/default_avatar_large.png'))
		{
			header('Content-Length: ' . $filesize);
		}
		header('Last-Modified: ' . gmdate('D, d M Y H:i:s', 0) . ' GMT');
		readfile(DIR . '/images/default/default_avatar_large.png');
	}
}
else if ($vbulletin->GPC['groupid'])
{
	$vbulletin->input->clean_array_gpc('r', array(
		'dateline' => vB_Cleaner::TYPE_UINT,
	));

	$params['filedata'] = (($vbulletin->GPC['type'] == 'groupthumb') ? 'thumbnail_filedata' : 'filedata');
	$params['groupid'] = $vbulletin->GPC['groupid'];

	header('Cache-control: max-age=31536000');
	header('Expires: ' . gmdate('D, d M Y H:i:s', (TIMENOW + 31536000)) . ' GMT');
	if (vB::getDbAssertor()->getRow('fetchSocialgroupIcon', $params))
	{
		header('Content-disposition: inline; filename=' . $imageinfo['filename']);
		header('Content-transfer-encoding: binary');
		header('Content-Length: ' . strlen($imageinfo['filedata']));
		header('Last-Modified: ' . gmdate('D, d M Y H:i:s', $imageinfo['dateline']) . ' GMT');
		header('ETag: "' . $imageinfo['dateline'] . '-' . $vbulletin->GPC['groupid'] . '"');
		$extension = trim($imageinfo['extension']);
		if ($extension == 'jpg' OR $extension == 'jpeg')
		{
			header('Content-type: image/jpeg');
		}
		else if ($extension == 'png')
		{
			header('Content-type: image/png');
		}
		else
		{
			header('Content-type: image/gif');
		}
		echo $imageinfo['filedata'];
	}
	else
	{
		header('Content-disposition: inline; filename=default_sg_large.png');
		header('Content-transfer-encoding: binary');
		header('Content-type: image/png');
		if ($filesize = @filesize(DIR . '/images/default/default_sg_large.png'))
		{
			header('Content-Length: ' . $filesize);
		}
		header('Last-Modified: ' . gmdate('D, d M Y H:i:s', 0) . ' GMT');
		readfile(DIR . '/images/default/default_sg_large.png');
	}
}

/*=========================================================================*\
|| #######################################################################
|| # Downloaded: 15:45, Tue Sep 8th 2015
|| # CVS: $RCSfile$ - $Revision: 83432 $
|| #######################################################################
\*=========================================================================*/