-
Notifications
You must be signed in to change notification settings - Fork 821
/
HTTP.php
349 lines (290 loc) · 11.6 KB
/
HTTP.php
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
<?php
/**
* A class with HTTP-related helpers.
* Like Debug, this is more a bundle of methods than a class ;-)
*
* @package framework
* @subpackage misc
*/
class HTTP {
protected static $cache_age = 0;
protected static $modification_date = null;
protected static $etag = null;
/**
* Turns a local system filename into a URL by comparing it to the script filename
*/
public static function filename2url($filename) {
$slashPos = -1;
while(($slashPos = strpos($filename, "/", $slashPos+1)) !== false) {
if(substr($filename, 0, $slashPos) == substr($_SERVER['SCRIPT_FILENAME'],0,$slashPos)) {
$commonLength = $slashPos;
} else {
break;
}
}
$urlBase = substr($_SERVER['PHP_SELF'], 0, -(strlen($_SERVER['SCRIPT_FILENAME']) - $commonLength));
$url = $urlBase . substr($filename, $commonLength);
$protocol = (isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] != 'off') ? "https" : "http";
return "$protocol://". $_SERVER['HTTP_HOST'] . $url;
// Count the number of extra folders the script is in.
// $prefix = str_repeat("../", substr_count(substr($_SERVER[SCRIPT_FILENAME],$commonBaseLength)));
}
/**
* Turn all relative URLs in the content to absolute URLs
*/
public static function absoluteURLs($html) {
$html = str_replace('$CurrentPageURL', $_SERVER['REQUEST_URI'], $html);
return HTTP::urlRewriter($html, '(substr($URL,0,1) == "/") ? ( Director::protocolAndHost() . $URL ) :'
. ' ( (preg_match("/^[A-Za-z]+:/", $URL)) ? $URL : Director::absoluteBaseURL() . $URL )' );
}
/*
* Rewrite all the URLs in the given content, evaluating the given string as PHP code
*
* Put $URL where you want the URL to appear, however, you can't embed $URL in strings
* Some example code:
* '"../../" . $URL'
* 'myRewriter($URL)'
* '(substr($URL,0,1)=="/") ? "../" . substr($URL,1) : $URL'
*/
public static function urlRewriter($content, $code) {
$attribs = array("src","background","a" => "href","link" => "href", "base" => "href");
foreach($attribs as $tag => $attrib) {
if(!is_numeric($tag)) $tagPrefix = "$tag ";
else $tagPrefix = "";
$regExps[] = "/(<{$tagPrefix}[^>]*$attrib *= *\")([^\"]*)(\")/ie";
$regExps[] = "/(<{$tagPrefix}[^>]*$attrib *= *')([^']*)(')/ie";
$regExps[] = "/(<{$tagPrefix}[^>]*$attrib *= *)([^\"' ]*)( )/ie";
}
$regExps[] = '/(background-image:[^;]*url *\()([^)]+)(\))/ie';
$regExps[] = '/(background:[^;]*url *\()([^)]+)(\))/ie';
$regExps[] = '/(list-style-image:[^;]*url *\()([^)]+)(\))/ie';
$regExps[] = '/(list-style:[^;]*url *\()([^)]+)(\))/ie';
// Make
$code = 'stripslashes("$1") . (' . str_replace('$URL', 'stripslashes("$2")', $code) . ') . stripslashes("$3")';
foreach($regExps as $regExp) {
$content = preg_replace($regExp, $code, $content);
}
return $content;
}
/**
* Will try to include a GET parameter for an existing URL,
* preserving existing parameters and fragments.
* If no URL is given, falls back to $_SERVER['REQUEST_URI'].
* Uses parse_url() to dissect the URL, and http_build_query() to reconstruct it
* with the additional parameter. Converts any '&' (ampersand)
* URL parameter separators to the more XHTML compliant '&'.
*
* CAUTION: If the URL is determined to be relative,
* it is prepended with Director::absoluteBaseURL().
* This method will always return an absolute URL because
* Director::makeRelative() can lead to inconsistent results.
*
* @param String $varname
* @param String $varvalue
* @param String $currentURL Relative or absolute URL (Optional).
* @param String $separator Separator for http_build_query(). (Optional).
* @return String Absolute URL
*/
public static function setGetVar($varname, $varvalue, $currentURL = null, $separator = '&') {
$uri = $currentURL ? $currentURL : Director::makeRelative($_SERVER['REQUEST_URI']);
$isRelative = false;
// We need absolute URLs for parse_url()
if(Director::is_relative_url($uri)) {
$uri = Director::absoluteBaseURL() . $uri;
$isRelative = true;
}
// try to parse uri
$parts = parse_url($uri);
if(!$parts) {
throw new InvalidArgumentException("Can't parse URL: " . $uri);
}
// Parse params and add new variable
$params = array();
if(isset($parts['query'])) parse_str($parts['query'], $params);
$params[$varname] = $varvalue;
// Generate URI segments and formatting
$scheme = (isset($parts['scheme'])) ? $parts['scheme'] : 'http';
$user = (isset($parts['user']) && $parts['user'] != '') ? $parts['user'] : '';
if($user != '') {
// format in either user:pass@host.com or user@host.com
$user .= (isset($parts['pass']) && $parts['pass'] != '') ? ':' . $parts['pass'] . '@' : '@';
}
$host = (isset($parts['host'])) ? $parts['host'] : '';
$port = (isset($parts['port']) && $parts['port'] != '') ? ':'.$parts['port'] : '';
$path = (isset($parts['path']) && $parts['path'] != '') ? $parts['path'] : '';
// handle URL params which are existing / new
$params = ($params) ? '?' . http_build_query($params, null, $separator) : '';
// keep fragments (anchors) intact.
$fragment = (isset($parts['fragment']) && $parts['fragment'] != '') ? '#'.$parts['fragment'] : '';
// Recompile URI segments
$newUri = $scheme . '://' . $user . $host . $port . $path . $params . $fragment;
if($isRelative) return Director::makeRelative($newUri);
return $newUri;
}
public static function RAW_setGetVar($varname, $varvalue, $currentURL = null) {
$url = self::setGetVar($varname, $varvalue, $currentURL);
return Convert::xml2raw($url);
}
/**
* Search for all tags with a specific attribute, then return the value of that attribute in a flat array.
*
* @param string $content
* @param array $attributes an array of tags to attributes, for example "[a] => 'href', [div] => 'id'"
* @return array
*/
public static function findByTagAndAttribute($content, $attributes) {
$regexes = array();
foreach($attributes as $tag => $attribute) {
$regexes[] = "/<{$tag} [^>]*$attribute *= *([\"'])(.*?)\\1[^>]*>/i";
$regexes[] = "/<{$tag} [^>]*$attribute *= *([^ \"'>]+)/i";
}
$result = array();
if($regexes) foreach($regexes as $regex) {
if(preg_match_all($regex, $content, $matches)) {
$result = array_merge_recursive($result, (isset($matches[2]) ? $matches[2] : $matches[1]));
}
}
return count($result) ? $result : null;
}
public static function getLinksIn($content) {
return self::findByTagAndAttribute($content, array("a" => "href"));
}
public static function getImagesIn($content) {
return self::findByTagAndAttribute($content, array("img" => "src"));
}
/**
* Get mime type based on extension
*
* @uses finfo
* @deprecated Use HTTP::get_mime_type() instead
*/
public static function getMimeType($filename) {
Deprecation::notice('3.0', 'Use HTTP::get_mime_type() instead.');
self::get_mime_type($filename);
}
/**
* Get the MIME type based on a file's extension.
*
* If the finfo class exists in PHP, and the file actually exists, then use that
* extension, otherwise fallback to a list of commonly known MIME types.
*
* @uses finfo
* @param string $filename Relative path to filename from project root, e.g. "mysite/tests/file.csv"
* @return string MIME type
*/
public static function get_mime_type($filename) {
// If the finfo module is compiled into PHP, use it.
$path = BASE_PATH . DIRECTORY_SEPARATOR . $filename;
if(class_exists('finfo') && file_exists($path)) {
$finfo = new finfo(FILEINFO_MIME_TYPE);
return $finfo->file($path);
}
// Fallback to use the list from the HTTP.yml configuration and rely on the file extension
// to get the file mime-type
$ext = File::get_file_extension($filename);
// Get the mime-types
$mimeTypes = Config::inst()->get('HTTP', 'MimeTypes');
// The mime type doesn't exist
if(!isset($mimeTypes[$ext])) {
return 'application/unknown';
}
return $mimeTypes[$ext];
}
/**
* Set the maximum age of this page in web caches, in seconds
*/
public static function set_cache_age($age) {
self::$cache_age = $age;
}
public static function register_modification_date($dateString) {
$timestamp = strtotime($dateString);
if($timestamp > self::$modification_date)
self::$modification_date = $timestamp;
}
public static function register_modification_timestamp($timestamp) {
if($timestamp > self::$modification_date)
self::$modification_date = $timestamp;
}
public static function register_etag($etag) {
self::$etag = $etag;
}
/**
* Add the appropriate caching headers to the response, including If-Modified-Since / 304 handling.
*
* @param SS_HTTPResponse The SS_HTTPResponse object to augment. Omitted the argument or passing a string is
* deprecated; in these cases, the headers are output directly.
*/
public static function add_cache_headers($body = null) {
// Validate argument
if($body && !($body instanceof SS_HTTPResponse)) {
user_error("HTTP::add_cache_headers() must be passed an SS_HTTPResponse object", E_USER_WARNING);
$body = null;
}
// Development sites have frequently changing templates; this can get stuffed up by the code
// below.
if(Director::isDev()) return;
// The headers have been sent and we don't have an SS_HTTPResponse object to attach things to; no point in
// us trying.
if(headers_sent() && !$body) return;
// Popuplate $responseHeaders with all the headers that we want to build
$responseHeaders = array();
if(function_exists('apache_request_headers')) {
$requestHeaders = apache_request_headers();
if(isset($requestHeaders['X-Requested-With']) && $requestHeaders['X-Requested-With']=='XMLHttpRequest') {
self::$cache_age = 0;
}
// bdc: now we must check for DUMB IE6:
if(isset($requestHeaders['x-requested-with']) && $requestHeaders['x-requested-with']=='XMLHttpRequest') {
self::$cache_age = 0;
}
}
if(self::$cache_age > 0) {
$responseHeaders["Cache-Control"] = "max-age=" . self::$cache_age . ", must-revalidate, no-transform";
$responseHeaders["Pragma"] = "";
// To do: User-Agent should only be added in situations where you *are* actually varying according to user-agent.
$responseHeaders['Vary'] = 'Cookie, X-Forwarded-Protocol, User-Agent';
} else {
$responseHeaders["Cache-Control"] = "no-cache, max-age=0, must-revalidate, no-transform";
}
if(self::$modification_date && self::$cache_age > 0) {
$responseHeaders["Last-Modified"] =self::gmt_date(self::$modification_date);
// 304 response detection
if(isset($_SERVER['HTTP_IF_MODIFIED_SINCE'])) {
$ifModifiedSince = strtotime(stripslashes($_SERVER['HTTP_IF_MODIFIED_SINCE']));
if($ifModifiedSince >= self::$modification_date) {
if($body) {
$body->setStatusCode(304);
$body->setBody('');
} else {
header('HTTP/1.0 304 Not Modified');
die();
}
}
}
$expires = time() + self::$cache_age;
$responseHeaders["Expires"] = self::gmt_date($expires);
}
if(self::$etag) {
$responseHeaders['ETag'] = self::$etag;
}
// Now that we've generated them, either output them or attach them to the SS_HTTPResponse as appropriate
foreach($responseHeaders as $k => $v) {
if($body) $body->addHeader($k, $v);
else if(!headers_sent()) header("$k: $v");
}
}
/**
* Return an {@link http://www.faqs.org/rfcs/rfc2822 RFC 2822} date in the
* GMT timezone (a timestamp is always in GMT: the number of seconds
* since January 1 1970 00:00:00 GMT)
*/
public static function gmt_date($timestamp) {
return gmdate('D, d M Y H:i:s', $timestamp) . ' GMT';
}
/*
* Return static variable cache_age in second
*/
public static function get_cache_age() {
return self::$cache_age;
}
}