1 | <?php
|
---|
2 | /**
|
---|
3 | * Utilities for handling HTTP related tasks
|
---|
4 | *
|
---|
5 | * @license GPL 2 (http://www.gnu.org/licenses/gpl.html)
|
---|
6 | * @author Andreas Gohr <[email protected]>
|
---|
7 | */
|
---|
8 |
|
---|
9 | define('HTTP_MULTIPART_BOUNDARY','D0KuW1K1B0uNDARY');
|
---|
10 | define('HTTP_HEADER_LF',"\r\n");
|
---|
11 | define('HTTP_CHUNK_SIZE',16*1024);
|
---|
12 |
|
---|
13 | /**
|
---|
14 | * Checks and sets HTTP headers for conditional HTTP requests
|
---|
15 | *
|
---|
16 | * @author Simon Willison <[email protected]>
|
---|
17 | * @link http://simonwillison.net/2003/Apr/23/conditionalGet/
|
---|
18 | * @param timestamp $timestamp lastmodified time of the cache file
|
---|
19 | * @returns void or exits with previously header() commands executed
|
---|
20 | */
|
---|
21 | function http_conditionalRequest($timestamp){
|
---|
22 | // A PHP implementation of conditional get, see
|
---|
23 | // http://fishbowl.pastiche.org/2002/10/21/http_conditional_get_for_rss_hackers/
|
---|
24 | $last_modified = substr(gmdate('r', $timestamp), 0, -5).'GMT';
|
---|
25 | $etag = '"'.md5($last_modified).'"';
|
---|
26 | // Send the headers
|
---|
27 | header("Last-Modified: $last_modified");
|
---|
28 | header("ETag: $etag");
|
---|
29 | // See if the client has provided the required headers
|
---|
30 | if (isset($_SERVER['HTTP_IF_MODIFIED_SINCE'])){
|
---|
31 | $if_modified_since = stripslashes($_SERVER['HTTP_IF_MODIFIED_SINCE']);
|
---|
32 | }else{
|
---|
33 | $if_modified_since = false;
|
---|
34 | }
|
---|
35 |
|
---|
36 | if (isset($_SERVER['HTTP_IF_NONE_MATCH'])){
|
---|
37 | $if_none_match = stripslashes($_SERVER['HTTP_IF_NONE_MATCH']);
|
---|
38 | }else{
|
---|
39 | $if_none_match = false;
|
---|
40 | }
|
---|
41 |
|
---|
42 | if (!$if_modified_since && !$if_none_match){
|
---|
43 | return;
|
---|
44 | }
|
---|
45 |
|
---|
46 | // At least one of the headers is there - check them
|
---|
47 | if ($if_none_match && $if_none_match != $etag) {
|
---|
48 | return; // etag is there but doesn't match
|
---|
49 | }
|
---|
50 |
|
---|
51 | if ($if_modified_since && $if_modified_since != $last_modified) {
|
---|
52 | return; // if-modified-since is there but doesn't match
|
---|
53 | }
|
---|
54 |
|
---|
55 | // Nothing has changed since their last request - serve a 304 and exit
|
---|
56 | header('HTTP/1.0 304 Not Modified');
|
---|
57 |
|
---|
58 | // don't produce output, even if compression is on
|
---|
59 | @ob_end_clean();
|
---|
60 | exit;
|
---|
61 | }
|
---|
62 |
|
---|
63 | /**
|
---|
64 | * Let the webserver send the given file vi x-sendfile method
|
---|
65 | *
|
---|
66 | * @author Chris Smith <[email protected]>
|
---|
67 | * @returns void or exits with previously header() commands executed
|
---|
68 | */
|
---|
69 | function http_sendfile($file) {
|
---|
70 | global $conf;
|
---|
71 |
|
---|
72 | //use x-sendfile header to pass the delivery to compatible webservers
|
---|
73 | if($conf['xsendfile'] == 1){
|
---|
74 | header("X-LIGHTTPD-send-file: $file");
|
---|
75 | ob_end_clean();
|
---|
76 | exit;
|
---|
77 | }elseif($conf['xsendfile'] == 2){
|
---|
78 | header("X-Sendfile: $file");
|
---|
79 | ob_end_clean();
|
---|
80 | exit;
|
---|
81 | }elseif($conf['xsendfile'] == 3){
|
---|
82 | header("X-Accel-Redirect: $file");
|
---|
83 | ob_end_clean();
|
---|
84 | exit;
|
---|
85 | }
|
---|
86 |
|
---|
87 | return false;
|
---|
88 | }
|
---|
89 |
|
---|
90 | /**
|
---|
91 | * Send file contents supporting rangeRequests
|
---|
92 | *
|
---|
93 | * This function exits the running script
|
---|
94 | *
|
---|
95 | * @param ressource $fh - file handle for an already open file
|
---|
96 | * @param int $size - size of the whole file
|
---|
97 | * @param int $mime - MIME type of the file
|
---|
98 | *
|
---|
99 | * @author Andreas Gohr <[email protected]>
|
---|
100 | */
|
---|
101 | function http_rangeRequest($fh,$size,$mime){
|
---|
102 | $ranges = array();
|
---|
103 | $isrange = false;
|
---|
104 |
|
---|
105 | header('Accept-Ranges: bytes');
|
---|
106 |
|
---|
107 | if(!isset($_SERVER['HTTP_RANGE'])){
|
---|
108 | // no range requested - send the whole file
|
---|
109 | $ranges[] = array(0,$size,$size);
|
---|
110 | }else{
|
---|
111 | $t = explode('=', $_SERVER['HTTP_RANGE']);
|
---|
112 | if (!$t[0]=='bytes') {
|
---|
113 | // we only understand byte ranges - send the whole file
|
---|
114 | $ranges[] = array(0,$size,$size);
|
---|
115 | }else{
|
---|
116 | $isrange = true;
|
---|
117 | // handle multiple ranges
|
---|
118 | $r = explode(',',$t[1]);
|
---|
119 | foreach($r as $x){
|
---|
120 | $p = explode('-', $x);
|
---|
121 | $start = (int)$p[0];
|
---|
122 | $end = (int)$p[1];
|
---|
123 | if (!$end) $end = $size - 1;
|
---|
124 | if ($start > $end || $start > $size || $end > $size){
|
---|
125 | header('HTTP/1.1 416 Requested Range Not Satisfiable');
|
---|
126 | print 'Bad Range Request!';
|
---|
127 | exit;
|
---|
128 | }
|
---|
129 | $len = $end - $start + 1;
|
---|
130 | $ranges[] = array($start,$end,$len);
|
---|
131 | }
|
---|
132 | }
|
---|
133 | }
|
---|
134 | $parts = count($ranges);
|
---|
135 |
|
---|
136 | // now send the type and length headers
|
---|
137 | if(!$isrange){
|
---|
138 | header("Content-Type: $mime",true);
|
---|
139 | }else{
|
---|
140 | header('HTTP/1.1 206 Partial Content');
|
---|
141 | if($parts == 1){
|
---|
142 | header("Content-Type: $mime",true);
|
---|
143 | }else{
|
---|
144 | header('Content-Type: multipart/byteranges; boundary='.HTTP_MULTIPART_BOUNDARY,true);
|
---|
145 | }
|
---|
146 | }
|
---|
147 |
|
---|
148 | // send all ranges
|
---|
149 | for($i=0; $i<$parts; $i++){
|
---|
150 | list($start,$end,$len) = $ranges[$i];
|
---|
151 |
|
---|
152 | // multipart or normal headers
|
---|
153 | if($parts > 1){
|
---|
154 | echo HTTP_HEADER_LF.'--'.HTTP_MULTIPART_BOUNDARY.HTTP_HEADER_LF;
|
---|
155 | echo "Content-Type: $mime".HTTP_HEADER_LF;
|
---|
156 | echo "Content-Range: bytes $start-$end/$size".HTTP_HEADER_LF;
|
---|
157 | echo HTTP_HEADER_LF;
|
---|
158 | }else{
|
---|
159 | header("Content-Length: $len");
|
---|
160 | if($isrange){
|
---|
161 | header("Content-Range: bytes $start-$end/$size");
|
---|
162 | }
|
---|
163 | }
|
---|
164 |
|
---|
165 | // send file content
|
---|
166 | fseek($fh,$start); //seek to start of range
|
---|
167 | $chunk = ($len > HTTP_CHUNK_SIZE) ? HTTP_CHUNK_SIZE : $len;
|
---|
168 | while (!feof($fh) && $chunk > 0) {
|
---|
169 | @set_time_limit(30); // large files can take a lot of time
|
---|
170 | print fread($fh, $chunk);
|
---|
171 | flush();
|
---|
172 | $len -= $chunk;
|
---|
173 | $chunk = ($len > HTTP_CHUNK_SIZE) ? HTTP_CHUNK_SIZE : $len;
|
---|
174 | }
|
---|
175 | }
|
---|
176 | if($parts > 1){
|
---|
177 | echo HTTP_HEADER_LF.'--'.HTTP_MULTIPART_BOUNDARY.'--'.HTTP_HEADER_LF;
|
---|
178 | }
|
---|
179 |
|
---|
180 | // everything should be done here, exit
|
---|
181 | exit;
|
---|
182 | }
|
---|
183 |
|
---|
184 | /**
|
---|
185 | * Check for a gzipped version and create if necessary
|
---|
186 | *
|
---|
187 | * return true if there exists a gzip version of the uncompressed file
|
---|
188 | * (samepath/samefilename.sameext.gz) created after the uncompressed file
|
---|
189 | *
|
---|
190 | * @author Chris Smith <[email protected]>
|
---|
191 | */
|
---|
192 | function http_gzip_valid($uncompressed_file) {
|
---|
193 | $gzip = $uncompressed_file.'.gz';
|
---|
194 | if (filemtime($gzip) < filemtime($uncompressed_file)) { // filemtime returns false (0) if file doesn't exist
|
---|
195 | return copy($uncompressed_file, 'compress.zlib://'.$gzip);
|
---|
196 | }
|
---|
197 |
|
---|
198 | return true;
|
---|
199 | }
|
---|