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Fixes #495, #485, #486, #487 - Browser cache issues.

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Cameron
2014-05-24 20:40:51 -07:00
parent 3f321b55e3
commit c4bfa03be1
3 changed files with 179 additions and 77 deletions
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172
class2.php
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@@ -2295,6 +2295,178 @@ class error_handler
}
}
/**
* Manage Headers sent to browser.
* It is important to specify one of Expires or Cache-Control max-age, and one of Last-Modified or ETag, for all cacheable resources.
* It is redundant to specify both Expires and Cache-Control: max-age, or to specify both Last-Modified and ETag.
* Reference : http://css-tricks.com/snippets/php/intelligent-php-cache-control/
* XXX Etag cannot be relied on as some hosts have Etag disabled.
* XXX session_cache_limiter('private') will override some of the things below and bring back our browser cache issues.
*/
class e_http_header
{
private $content;
private $etag;
private $compress_output = false;
private $compression_level = 6;
private $compression_browser_support = false;
private $compression_server_support = false;
private $headers = array();
function __construct()
{
if (strstr(varset($_SERVER['HTTP_ACCEPT_ENCODING'], ''), 'gzip'))
{
$this->compression_browser_support = true;
}
if(ini_get("zlib.output_compression") == '' && function_exists("gzencode"))
{
$this->compression_server_support = true;
}
$this->compress_output = varset(e107::getPref('compress_output'),false);
}
function setContent($content)
{
$this->etag = md5($content);
$this->content = $content;
}
function setHeader($header, $force=false, $response_code=null)
{
list($key,$val) = explode(':',$header,2);
$this->headers[$key] = $val;
header($header, $force, $response_code);
}
function debug()
{
echo "<h3>Server Headers</h3>";
$server = getallheaders();
ksort($server);
print_a($server);
echo "<h3>e107 Headers</h3>";
ksort($this->headers);
print_a($this->headers);
var_dump($this->compress_output);
$server = array();
foreach($_SERVER as $k=>$v)
{
if(substr($k,0,4) == 'HTTP')
{
$server[$k] = $v;
}
}
echo "<h3>_SERVER</h3>";
print_a($server);
}
function send()
{
// Disable caching of html.
/*
$this->setHeader("Expires: 0", true);
$this->setHeader("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT", true);
$this->setHeader("Cache-Control: no-store, no-cache, must-revalidate", true);
$this->setHeader("Cache-Control: post-check=0, pre-check=0", false);
$this->setHeader("Pragma: no-cache");
$this->setHeader("Cache-Control: max-age=0", false);
*/
// $this->setHeader("Cache-Control: public", true);
$canCache = e107::canCache();
// $this->setHeader("Cache-Control: must-revalidate", true);
if($canCache && !deftrue('e_NOCACHE') && $_SERVER['REQUEST_METHOD'] === 'GET' && $_SERVER['QUERY_STRING'] != 'logout')
{
// header("Cache-Control: must-revalidate", true);
if(e107::getPref('site_page_expires')) // TODO - allow per page
{
if (function_exists('date_default_timezone_set'))
{
date_default_timezone_set('UTC');
}
$time = time()+ (integer) e107::getPref('site_page_expires');
$this->setHeader('Expires: '.gmdate("D, d M Y H:i:s", $time).' GMT', true);
}
}
else
{
$canCache = false;
}
if($this->compress_out != false && $this->compression_server_support == true && $this->compression_browser_support == true)
{
// $this->setHeader("ETag: \"{$this->etag}-gzip\"");
$this->setHeader('ETag: "'.$this->etag.'-gzip"', true);
$page = gzencode($this->content, $this->compression_level);
$this->setHeader("Content-Encoding: gzip", true);
$this->setHeader("Content-Length: ".strlen($page), true);
}
else
{
if($this->compression_browser_support ==true)
{
$this->setHeader('ETag: "'.$this->etag.'-gzip"', true);
}
else
{
$this->setHeader('ETag: "'.$this->etag.'"', true);
}
$this->setHeader("Content-Length: ".strlen($this->content), true);
}
$this->setHeader("X-Powered-By: e107", true); // no less secure than e107-specific html.
if($this->compression_server_support == true)
{
$this->setHeader('Vary: Accept-Encoding');
}
else
{
$this->setHeader('Vary: Accept');
}
// should come after the Etag header
if ($canCache && isset($_SERVER['HTTP_IF_NONE_MATCH']))
{
$IF_NONE_MATCH = str_replace('"','',$_SERVER['HTTP_IF_NONE_MATCH']);
if($IF_NONE_MATCH == $this->etag || ($IF_NONE_MATCH == ($this->etag."-gzip")))
{
$this->setHeader('HTTP/1.1 304 Not Modified');
exit();
}
}
}
}
$sql->db_Mark_Time('(After class2)');