396 lines
14 KiB
PHP
396 lines
14 KiB
PHP
<?php
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/**
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* A class with HTTP-related helpers.
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* Like Debug, this is more a bundle of methods than a class ;-)
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*
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* @package framework
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* @subpackage misc
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*/
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class HTTP {
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protected static $cache_age = 0;
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protected static $modification_date = null;
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protected static $etag = null;
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/**
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* Turns a local system filename into a URL by comparing it to the script filename
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*/
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public static function filename2url($filename) {
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$slashPos = -1;
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while(($slashPos = strpos($filename, "/", $slashPos+1)) !== false) {
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if(substr($filename, 0, $slashPos) == substr($_SERVER['SCRIPT_FILENAME'],0,$slashPos)) {
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$commonLength = $slashPos;
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} else {
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break;
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}
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}
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$urlBase = substr($_SERVER['PHP_SELF'], 0, -(strlen($_SERVER['SCRIPT_FILENAME']) - $commonLength));
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$url = $urlBase . substr($filename, $commonLength);
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$protocol = (isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] != 'off') ? "https" : "http";
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return "$protocol://". $_SERVER['HTTP_HOST'] . $url;
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// Count the number of extra folders the script is in.
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// $prefix = str_repeat("../", substr_count(substr($_SERVER[SCRIPT_FILENAME],$commonBaseLength)));
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}
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/**
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* Turn all relative URLs in the content to absolute URLs
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*/
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public static function absoluteURLs($html) {
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$html = str_replace('$CurrentPageURL', $_SERVER['REQUEST_URI'], $html);
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return HTTP::urlRewriter($html, function($url) {
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return Director::absoluteURL($url, true);
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});
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}
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/**
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* Rewrite all the URLs in the given content, evaluating the given string as PHP code.
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*
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* Put $URL where you want the URL to appear, however, you can't embed $URL in strings
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* Some example code:
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* <ul>
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* <li><code>'"../../" . $URL'</code></li>
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* <li><code>'myRewriter($URL)'</code></li>
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* <li><code>'(substr($URL,0,1)=="/") ? "../" . substr($URL,1) : $URL'</code></li>
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* </ul>
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*
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* As of 3.2 $code should be a callable which takes a single parameter and returns
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* the rewritten URL. e.g.
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*
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* <code>
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* function($url) {
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* return Director::absoluteURL($url, true);
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* }
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* </code>
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*
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* @param string $content The HTML to search for links to rewrite
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* @param string|callable $code Either a string that can evaluate to an expression
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* to rewrite links (depreciated), or a callable that takes a single
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* parameter and returns the rewritten URL
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* @return The content with all links rewritten as per the logic specified in $code
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*/
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public static function urlRewriter($content, $code) {
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if(!is_callable($code)) {
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Deprecation::notice(3.1, 'HTTP::urlRewriter expects a callable as the second parameter');
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}
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// Replace attributes
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$attribs = array("src","background","a" => "href","link" => "href", "base" => "href");
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foreach($attribs as $tag => $attrib) {
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if(!is_numeric($tag)) $tagPrefix = "$tag ";
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else $tagPrefix = "";
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$regExps[] = "/(<{$tagPrefix}[^>]*$attrib *= *\")([^\"]*)(\")/i";
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$regExps[] = "/(<{$tagPrefix}[^>]*$attrib *= *')([^']*)(')/i";
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$regExps[] = "/(<{$tagPrefix}[^>]*$attrib *= *)([^\"' ]*)( )/i";
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}
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// Replace css styles
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// @todo - http://www.css3.info/preview/multiple-backgrounds/
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$styles = array('background-image', 'background', 'list-style-image', 'list-style', 'content');
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foreach($styles as $style) {
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$regExps[] = "/($style:[^;]*url *\(\")([^\"]+)(\"\))/i";
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$regExps[] = "/($style:[^;]*url *\(')([^']+)('\))/i";
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$regExps[] = "/($style:[^;]*url *\()([^\"\)')]+)(\))/i";
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}
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// Callback for regexp replacement
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$callback = function($matches) use($code) {
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if(is_callable($code)) {
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$rewritten = $code($matches[2]);
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} else {
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// Expose the $URL variable to be used by the $code expression
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$URL = $matches[2];
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$rewritten = eval("return ($code);");
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}
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return $matches[1] . $rewritten . $matches[3];
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};
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// Execute each expression
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foreach($regExps as $regExp) {
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$content = preg_replace_callback($regExp, $callback, $content);
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}
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return $content;
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}
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/**
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* Will try to include a GET parameter for an existing URL,
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* preserving existing parameters and fragments.
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* If no URL is given, falls back to $_SERVER['REQUEST_URI'].
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* Uses parse_url() to dissect the URL, and http_build_query() to reconstruct it
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* with the additional parameter. Converts any '&' (ampersand)
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* URL parameter separators to the more XHTML compliant '&'.
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*
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* CAUTION: If the URL is determined to be relative,
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* it is prepended with Director::absoluteBaseURL().
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* This method will always return an absolute URL because
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* Director::makeRelative() can lead to inconsistent results.
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*
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* @param String $varname
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* @param String $varvalue
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* @param String $currentURL Relative or absolute URL (Optional).
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* @param String $separator Separator for http_build_query(). (Optional).
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* @return String Absolute URL
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*/
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public static function setGetVar($varname, $varvalue, $currentURL = null, $separator = '&') {
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$uri = $currentURL ? $currentURL : Director::makeRelative($_SERVER['REQUEST_URI']);
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$isRelative = false;
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// We need absolute URLs for parse_url()
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if(Director::is_relative_url($uri)) {
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$uri = Director::absoluteBaseURL() . $uri;
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$isRelative = true;
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}
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// try to parse uri
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$parts = parse_url($uri);
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if(!$parts) {
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throw new InvalidArgumentException("Can't parse URL: " . $uri);
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}
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// Parse params and add new variable
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$params = array();
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if(isset($parts['query'])) parse_str($parts['query'], $params);
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$params[$varname] = $varvalue;
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// Generate URI segments and formatting
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$scheme = (isset($parts['scheme'])) ? $parts['scheme'] : 'http';
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$user = (isset($parts['user']) && $parts['user'] != '') ? $parts['user'] : '';
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if($user != '') {
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// format in either user:pass@host.com or user@host.com
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$user .= (isset($parts['pass']) && $parts['pass'] != '') ? ':' . $parts['pass'] . '@' : '@';
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}
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$host = (isset($parts['host'])) ? $parts['host'] : '';
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$port = (isset($parts['port']) && $parts['port'] != '') ? ':'.$parts['port'] : '';
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$path = (isset($parts['path']) && $parts['path'] != '') ? $parts['path'] : '';
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// handle URL params which are existing / new
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$params = ($params) ? '?' . http_build_query($params, null, $separator) : '';
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// keep fragments (anchors) intact.
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$fragment = (isset($parts['fragment']) && $parts['fragment'] != '') ? '#'.$parts['fragment'] : '';
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// Recompile URI segments
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$newUri = $scheme . '://' . $user . $host . $port . $path . $params . $fragment;
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if($isRelative) return Director::makeRelative($newUri);
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return $newUri;
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}
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public static function RAW_setGetVar($varname, $varvalue, $currentURL = null) {
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$url = self::setGetVar($varname, $varvalue, $currentURL);
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return Convert::xml2raw($url);
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}
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/**
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* Search for all tags with a specific attribute, then return the value of that attribute in a flat array.
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*
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* @param string $content
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* @param array $attributes an array of tags to attributes, for example "[a] => 'href', [div] => 'id'"
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* @return array
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*/
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public static function findByTagAndAttribute($content, $attributes) {
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$regexes = array();
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foreach($attributes as $tag => $attribute) {
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$regexes[] = "/<{$tag} [^>]*$attribute *= *([\"'])(.*?)\\1[^>]*>/i";
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$regexes[] = "/<{$tag} [^>]*$attribute *= *([^ \"'>]+)/i";
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}
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$result = array();
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if($regexes) foreach($regexes as $regex) {
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if(preg_match_all($regex, $content, $matches)) {
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$result = array_merge_recursive($result, (isset($matches[2]) ? $matches[2] : $matches[1]));
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}
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}
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return count($result) ? $result : null;
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}
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public static function getLinksIn($content) {
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return self::findByTagAndAttribute($content, array("a" => "href"));
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}
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public static function getImagesIn($content) {
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return self::findByTagAndAttribute($content, array("img" => "src"));
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}
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/**
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* Get the MIME type based on a file's extension.
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*
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* If the finfo class exists in PHP, and the file actually exists, then use that
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* extension, otherwise fallback to a list of commonly known MIME types.
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*
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* @uses finfo
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* @param string $filename Relative path to filename from project root, e.g. "mysite/tests/file.csv"
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* @return string MIME type
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*/
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public static function get_mime_type($filename) {
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// If the finfo module is compiled into PHP, use it.
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$path = BASE_PATH . DIRECTORY_SEPARATOR . $filename;
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if(class_exists('finfo') && file_exists($path)) {
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$finfo = new finfo(FILEINFO_MIME_TYPE);
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return $finfo->file($path);
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}
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// Fallback to use the list from the HTTP.yml configuration and rely on the file extension
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// to get the file mime-type
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$ext = File::get_file_extension($filename);
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// Get the mime-types
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$mimeTypes = Config::inst()->get('HTTP', 'MimeTypes');
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// The mime type doesn't exist
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if(!isset($mimeTypes[$ext])) {
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return 'application/unknown';
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}
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return $mimeTypes[$ext];
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}
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/**
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* Set the maximum age of this page in web caches, in seconds
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*/
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public static function set_cache_age($age) {
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self::$cache_age = $age;
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}
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public static function register_modification_date($dateString) {
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$timestamp = strtotime($dateString);
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if($timestamp > self::$modification_date)
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self::$modification_date = $timestamp;
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}
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public static function register_modification_timestamp($timestamp) {
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if($timestamp > self::$modification_date)
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self::$modification_date = $timestamp;
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}
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public static function register_etag($etag) {
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self::$etag = $etag;
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}
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/**
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* Add the appropriate caching headers to the response, including If-Modified-Since / 304 handling.
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*
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* @param SS_HTTPResponse The SS_HTTPResponse object to augment. Omitted the argument or passing a string is
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* deprecated; in these cases, the headers are output directly.
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*/
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public static function add_cache_headers($body = null) {
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// Validate argument
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if($body && !($body instanceof SS_HTTPResponse)) {
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user_error("HTTP::add_cache_headers() must be passed an SS_HTTPResponse object", E_USER_WARNING);
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$body = null;
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}
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// Development sites have frequently changing templates; this can get stuffed up by the code
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// below.
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if(Director::isDev()) return;
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// The headers have been sent and we don't have an SS_HTTPResponse object to attach things to; no point in
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// us trying.
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if(headers_sent() && !$body) return;
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// Popuplate $responseHeaders with all the headers that we want to build
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$responseHeaders = array();
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if(function_exists('apache_request_headers')) {
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$requestHeaders = apache_request_headers();
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if(isset($requestHeaders['X-Requested-With']) && $requestHeaders['X-Requested-With']=='XMLHttpRequest') {
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self::$cache_age = 0;
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}
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// bdc: now we must check for DUMB IE6:
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if(isset($requestHeaders['x-requested-with']) && $requestHeaders['x-requested-with']=='XMLHttpRequest') {
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self::$cache_age = 0;
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}
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}
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if(self::$cache_age > 0) {
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$responseHeaders["Cache-Control"] = "max-age=" . self::$cache_age . ", must-revalidate, no-transform";
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$responseHeaders["Pragma"] = "";
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// To do: User-Agent should only be added in situations where you *are* actually
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// varying according to user-agent.
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$responseHeaders['Vary'] = 'Cookie, X-Forwarded-Protocol, User-Agent, Accept';
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} else {
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$responseHeaders["Cache-Control"] = "no-cache, max-age=0, must-revalidate, no-transform";
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}
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if(self::$modification_date && self::$cache_age > 0) {
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$responseHeaders["Last-Modified"] = self::gmt_date(self::$modification_date);
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// Chrome ignores Varies when redirecting back (http://code.google.com/p/chromium/issues/detail?id=79758)
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// which means that if you log out, you get redirected back to a page which Chrome then checks against
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// last-modified (which passes, getting a 304)
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// when it shouldn't be trying to use that page at all because it's the "logged in" version.
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// By also using and etag that includes both the modification date and all the varies
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// values which we also check against we can catch this and not return a 304
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$etagParts = array(self::$modification_date, serialize($_COOKIE));
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if (isset($_SERVER['HTTP_X_FORWARDED_PROTOCOL'])) $etagParts[] = $_SERVER['HTTP_X_FORWARDED_PROTOCOL'];
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if (isset($_SERVER['HTTP_USER_AGENT'])) $etagParts[] = $_SERVER['HTTP_USER_AGENT'];
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if (isset($_SERVER['HTTP_ACCEPT'])) $etagParts[] = $_SERVER['HTTP_ACCEPT'];
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$etag = sha1(implode(':', $etagParts));
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$responseHeaders["ETag"] = $etag;
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// 304 response detection
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if(isset($_SERVER['HTTP_IF_MODIFIED_SINCE'])) {
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$ifModifiedSince = strtotime(stripslashes($_SERVER['HTTP_IF_MODIFIED_SINCE']));
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// As above, only 304 if the last request had all the same varies values
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// (or the etag isn't passed as part of the request - but with chrome it always is)
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$matchesEtag = !isset($_SERVER['HTTP_IF_NONE_MATCH']) || $_SERVER['HTTP_IF_NONE_MATCH'] == $etag;
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if($ifModifiedSince >= self::$modification_date && $matchesEtag) {
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if($body) {
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$body->setStatusCode(304);
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$body->setBody('');
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} else {
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header('HTTP/1.0 304 Not Modified');
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die();
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}
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}
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}
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$expires = time() + self::$cache_age;
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$responseHeaders["Expires"] = self::gmt_date($expires);
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}
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if(self::$etag) {
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$responseHeaders['ETag'] = self::$etag;
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}
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// Now that we've generated them, either output them or attach them to the SS_HTTPResponse as appropriate
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foreach($responseHeaders as $k => $v) {
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if($body) $body->addHeader($k, $v);
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else if(!headers_sent()) header("$k: $v");
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}
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}
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/**
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* Return an {@link http://www.faqs.org/rfcs/rfc2822 RFC 2822} date in the
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* GMT timezone (a timestamp is always in GMT: the number of seconds
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* since January 1 1970 00:00:00 GMT)
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*/
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public static function gmt_date($timestamp) {
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return gmdate('D, d M Y H:i:s', $timestamp) . ' GMT';
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}
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/*
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* Return static variable cache_age in second
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*/
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public static function get_cache_age() {
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return self::$cache_age;
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}
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}
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