| commit | author | age | ||
| bcd661 | 1 | <?php |
| JK | 2 | class Fetch { |
| 3 | static function ftp($url, $file = NULL) { | |
| 4 | $url = parse_url($url); | |
| 5 | if(!isset($url['scheme']) || $url['scheme'] != 'ftp') { | |
| 6 | throw new Exception('Only FTP URLs are supported'); | |
| 7 | } | |
| 8 | if(!isset($url['host'])) { | |
| 9 | throw new Exception('Hostname not present in the URL'); | |
| 10 | } | |
| 11 | if(!isset($url['path'])) { | |
| 12 | throw new Exception('Path component not present in the URL'); | |
| 13 | } | |
| 14 | if(!isset($url['port'])) { | |
| 15 | $url['port'] = 21; | |
| 16 | } | |
| 17 | if(!isset($url['user'])) { | |
| 18 | $url['user'] = 'anonymous'; | |
| 19 | } | |
| 20 | if(!isset($url['pass'])) { | |
| 21 | $url['pass'] = 'anonymous@mpk.jacekk.net'; | |
| 22 | } | |
| 9419f7 | 23 | if($file === NULL) { |
| bcd661 | 24 | $file = basename($url['path']); |
| JK | 25 | } |
| 26 | ||
| 27 | $localTime = -1; | |
| 28 | $localSize = -1; | |
| 29 | if(is_file($file)) { | |
| 30 | $localTime = filemtime($file); | |
| 31 | $localSize = filesize($file); | |
| 32 | } | |
| 33 | ||
| 34 | $ftp = FtpConnection::create($url['host'], $url['port'], $url['user'], $url['pass']); | |
| 35 | $remoteSize = $ftp->size($url['path']); | |
| 36 | $remoteTime = $ftp->mdtm($url['path']); | |
| 37 | ||
| 38 | $updated = FALSE; | |
| 39 | ||
| 9419f7 | 40 | if($localTime >= $remoteTime && $localSize == $remoteSize) { |
| JK | 41 | return FALSE; |
| bcd661 | 42 | } |
| JK | 43 | |
| 9419f7 | 44 | if(file_exists($file.'.tmp')) { |
| JK | 45 | unlink($file.'.tmp'); |
| 46 | } | |
| 47 | $ftp->get($file.'.tmp', $url['path'], FTP_BINARY); | |
| 48 | touch($file.'.tmp', $remoteTime); | |
| 49 | if(!rename($file.'.tmp', $file)) { | |
| 50 | throw new Exception('Temporary file rename failed'); | |
| 51 | } | |
| 52 | ||
| 53 | return TRUE; | |
| 54 | } | |
| 55 | ||
| 56 | static function parse_http_headers($headers) { | |
| 57 | $hasHeader = FALSE; | |
| 58 | foreach($headers as $header) { | |
| 59 | if(substr($header, 0, 5) === 'HTTP/') { | |
| 60 | $code = substr($header, 9, 3); | |
| 61 | if($code === '304') { | |
| 62 | return NULL; | |
| 63 | } elseif(substr($code, 0, 1) == '2') { | |
| 64 | $hasHeader = TRUE; | |
| 65 | } | |
| 66 | } elseif($hasHeader && strtolower(substr($header, 0, 15)) === 'last-modified: ') { | |
| 67 | return strptime(substr($header, 15), 'D, d M Y H:i:s T'); | |
| 68 | } | |
| 69 | } | |
| 70 | return FALSE; | |
| bcd661 | 71 | } |
| JK | 72 | |
| 73 | static function generic($url, $file = NULL) { | |
| 9419f7 | 74 | if($file === NULL) { |
| bcd661 | 75 | $file = basename($url['url']); |
| JK | 76 | } |
| 9419f7 | 77 | |
| JK | 78 | $context = []; |
| 79 | if(is_file($file)) { | |
| 80 | $file_date = filemtime($file); | |
| 81 | $context['http'] = [ | |
| 82 | 'header' => [ | |
| 83 | 'If-Modified-Since: '.gmdate('D, d M Y H:i:s T', $file_date), | |
| 84 | ], | |
| 7c2d04 | 85 | 'timeout' => 15, |
| 9419f7 | 86 | ]; |
| JK | 87 | } |
| 88 | ||
| 89 | $data = file_get_contents($url, FALSE, stream_context_create($context)); | |
| 90 | $remoteTime = FALSE; | |
| 91 | if(isset($http_response_header) && is_array($http_response_header)) { | |
| 92 | $remoteTime = self::parse_http_headers($http_response_header); | |
| 93 | if($remoteTime === NULL) { | |
| 94 | return FALSE; | |
| 95 | } | |
| 96 | } | |
| 97 | ||
| bcd661 | 98 | if($data === FALSE) { |
| JK | 99 | throw new Exception('URL fetch failed'); |
| 100 | } | |
| 101 | if(file_put_contents($file.'.tmp', $data) === FALSE) { | |
| 102 | throw new Exception('Temporary file creation failed'); | |
| 103 | } | |
| 9419f7 | 104 | if($remoteTime !== FALSE) { |
| JK | 105 | touch($file.'.tmp', $remoteTime); |
| 106 | } | |
| bcd661 | 107 | if(!rename($file.'.tmp', $file)) { |
| JK | 108 | throw new Exception('Temporary file rename failed'); |
| 109 | } | |
| 9419f7 | 110 | |
| JK | 111 | return TRUE; |
| 112 | } | |
| 113 | ||
| 114 | static function auto($url, $file = NULL) { | |
| 115 | if($file === NULL) { | |
| 116 | $file = basename($url['url']); | |
| 117 | } | |
| 118 | if(substr($url, 0, 4) == 'ftp:') { | |
| 119 | return self::ftp($url, $file); | |
| 120 | } | |
| 121 | return self::generic($url, $file); | |
| bcd661 | 122 | } |
| JK | 123 | } |
