diff options
Diffstat (limited to 'functions/date_functions.php')
| -rw-r--r-- | functions/date_functions.php | 115 |
1 files changed, 94 insertions, 21 deletions
diff --git a/functions/date_functions.php b/functions/date_functions.php index 43a15a0..cd82fd5 100644 --- a/functions/date_functions.php +++ b/functions/date_functions.php @@ -4,28 +4,101 @@ require_once(BASE."functions/is_daylight.php"); // functions for returning or comparing dates -// get remote file last modification date (returns unix timestamp) -function remote_filemtime($url) { - $fp = fopen($url, 'r'); - if (!$fp) return 0; - $metadata = stream_get_meta_data($fp); - fclose($fp); - - $unixtime = 0; - foreach ($metadata['wrapper_data'] as $response) { - // case: redirection - // WARNING: does not handle relative redirection - if (substr(strtolower($response), 0, 10) == 'location: ') { - return GetRemoteLastModified(substr($response, 10)); - } - // case: last-modified - else if (substr(strtolower($response), 0, 15) == 'last-modified: ') { - $unixtime = strtotime(substr($response, 15)); - break; +/* + * Get remote file last modification date (returns unix timestamp) + * Supports HTTPS, HTTP basic authentication, and location: redirects + * FIXME: Basic auth should not be sent over unencrypted connections + * unless an HTTP 401 Unauthorized is returned + */ +function remote_filemtime($url, $recurse = 0) { + // We hate infinite loops! + if (++$recurse > 5) return 0; + + // Caching the remote mtime is a Really Good Idea. + static $remote_files = array(); + if (isset($remote_files[$url])) return $remote_files[$url]; + + $uri = parse_url($url); + $uri['proto'] = ( + (isset($uri['proto']) && ($uri['proto'] == 'https')) ? + 'ssl://' : + '' + ); + $uri['port'] = isset($uri['port']) ? $uri['port'] : 80; + $path = ( + (isset($uri['path']) || isset($uri['query'])) ? + (@$uri['path'] . @$uri['query']) : + '/' + ); + $auth = ( + (isset($uri['user']) || isset($uri['pass'])) ? + ('Authentication: Basic ' . base64_encode(@$uri['user'] . ':' . @$uri['pass']) . "\r\n") : + '' + ); + + $handle = @fsockopen($uri['proto'] . $uri['host'], $uri['port']); + if (!$handle) { + $remote_files[$url] = 0; + return 0; + } + + fputs($handle, "HEAD {$path} HTTP/1.1\r\nHost: {$uri['host']}\r\n{$auth}Connection: close\r\n\r\n"); + $headers = array(); + while (!feof($handle)) { + $line = trim(fgets($handle, 1024)); + if (empty($line)) break; + $headers[] = $line; + } + fclose($handle); + + $result = 0; + array_shift($headers); + foreach ($headers as $header) { + list($key, $value) = explode(':', $header, 2); + $value = trim($value); + + switch (strtolower(trim($key))) { + case 'location': // Redirect + $result = remote_filemtime(resolve_path($url, $value), $recurse); + break; + + case 'last-modified': // Got it! + $result = strtotime($value); + break; } } - return $unixtime; + $remote_files[$url] = $result; + return $result; +} + +/* + * Resolve relative paths + * Utility function for remote_filemtime() + */ +function resolve_path($url, $rel_path) { + $uri = parse_url($url); + + $uri['proto'] = (isset($uri['proto']) ? $uri['proto'] : 'http://'); + $uri['port'] = (isset($uri['port']) ? (':' . $uri['port']) : ''); + $auth = ( + (isset($uri['user']) || isset($uri['pass'])) ? + (urlencode(@$uri['user']) . ':' . urlencode(@$uri['pass']) . '@') : + '' + ); + + if (parse_url($rel_path) === false) { + // Path is relative to this domain + $rel_path = str_replace('\\', '/', $rel_path); + + if ($rel_path{0} == '/') + return $uri['proto'] . '://' . $auth . $uri['host'] . $uri['port'] . $rel_path; + + return $uri['proto'] . '://' . $auth . $uri['host'] . $uri['port'] . $uri['path'] . '/' . $rel_path; + } + + // Path is absolute + return $rel_path; } // takes iCalendar 2 day format and makes it into 3 characters @@ -235,10 +308,10 @@ function openevent($event_date, $time, $uid, $arr, $lines = 0, $length = 0, $lin # for iCal pseudo tag <http> comptability if (ereg('<([[:alpha:]]+://)([^<>[:space:]]+)>',$event_text,$matches)) { $full_event_text = $matches[1] . $matches[2]; - $event_text = $matches[2]; + $event_text = $matches[2]; } else { $full_event_text = $event_text; - $event_text = strip_tags($event_text, '<b><i><u><img>'); + $event_text = strip_tags($event_text, '<b><i><u><img>'); } if (!empty($link_class)) $link_class = ' class="'.$link_class.'"'; |