/**
* Return service url for ticket based authentication.
* $op Option for refreshing ticket or not.
* @param string $username The username to use for user authentication.
*/
function elis_files_utils_get_wc_url($url, $op = 'norefresh', $username = '') {
$endpoint = elis_files_base_url();
$ticket = elis_files_utils_get_ticket($op, $username);
if (false === strstr($url, '?') ) {
return $endpoint . $url . '?alf_ticket=' . $ticket;
} else {
return $endpoint . str_replace('?', '?alf_ticket=' . $ticket . '&', $url);
}
}
/**
* Download a file from alfresco - do we use this?
*
* @param string $uuid a unique id of directory in alfresco
* @param string $path path to a directory
* @return array|null
*/
public function get_file($uuid, $file = '') {
//error_log("get_file($uuid, '{$file}');");
$node = $this->elis_files->get_info($uuid);
if (empty($node)) {
return null;
}
// Test to make sure this works with, say, a teacher or someone non-admin
$username = '';
/// Check for a non-text file type to just pass through to the end user.
$mimetype = !empty($node->filemimetype) ? $node->filemimetype : '';
$ticket = elis_files_utils_get_ticket('refresh', $username);
$url = str_replace($node->filename, urlencode($node->filename), $node->fileurl) . '?alf_ticket=' .
$ticket;
$path = $this->prepare_file($file);
$fp = fopen($path, 'w');
$c = new curl;
$response = $c->download(array(array('url'=>$url, 'file'=>$fp)));
return array('path' => $path, 'url' => $url);
}
/**
* Return a file from the repository server.
*
* @uses $CFG
* @uses $USER
* @param string $uuid Unique identifier for a node.
* @param string $localfile A full system path (with filename) to download the contents locally.
* @param bool $return Set to true to just return the file content (optional).
* @param bool $process Whether to process text-based content for relative URLs for converting.
* @param bool $attachment true if desired as attachment, false(default) for file
* @return mixed|bool Returns the file to the browser (with appropriate MIME headers) or False on failure.
*/
function read_file($uuid, $localfile = '', $return = false, $process = true, $attachment = false) {
global $CFG, $USER;
if (ELIS_FILES_DEBUG_TRACE) mtrace('read_file(' . $uuid . ')');
$this->errormsg = '';
$downloading = false;
if (!empty($localfile)) {
if (!$localfh = fopen($localfile, 'w')) {
return false;
}
$downloading = true;
}
if (!($node = $this->get_info($uuid))) {
return false;
}
$username = '';
/// Check for a non-text file type to just pass through to the end user.
$mimetype = !empty($node->filemimetype) ? $node->filemimetype : '';
$url = str_replace($node->filename, urlencode($node->filename), $node->fileurl) . '?alf_ticket=' .
elis_files_utils_get_ticket('refresh', $username);
/// IE compatibiltiy HACK!
if (!$downloading &&
strpos($_SERVER['HTTP_USER_AGENT'], 'MSIE') !== false && ini_get('zlib.output_compression') == 'On') {
ini_set('zlib.output_compression', 'Off');
}
$processtypes = array(
'application/x-javascript',
'application/xhtml+xml',
'text/css'
);
/// Don't process non-text and "known" filetypes for relative links.
if ((strpos($mimetype, 'text') !== 0 && !in_array($mimetype, $processtypes)) || !$process) {
if (!$downloading && !$return && $headers = get_headers($url)) {
foreach ($headers as $header) {
if (0 === strpos(strtolower($header), 'http') ||
0 === strpos(strtolower($header), 'server') ||
0 === strpos(strtolower($header), 'set-cookie') ||
0 === strpos(strtolower($header), 'connection') ||
0 === strpos(strtolower($header), 'content-length')) {
continue;
}
header($header);
}
}
if (!$downloading && !$return) {
/// Cache this file for the required amount of time.
if (!empty($this->config->cache_time)) {
$age = $this->config->cache_time;
} else {
/// The "No" caching option has a value of zero, so
/// this handles the default (not set), as well as selecting "No"
$age = 0;
}
header('Cache-Control: max-age=' . $age);
header('Expires: ' . gmdate('D, d M Y H:i:s', time() + $age) . ' GMT');
header('Pragma: ');
$cd_header = 'Content-Disposition: ';
if ($attachment) {
$cd_header .= 'attachment; ';
}
header($cd_header .'filename="'. $node->filename .'"');
}
/// Close session - not needed anymore.
if (!$return) {
@session_write_close();
}
/// Read the file contents in chunks and output directly.
if ($fh = fopen($url, 'rb')) {
if ($return) {
$buffer = '';
}
if (!$downloading) {
while (!feof($fh)) {
if (($buf = fread($fh, 8192)) === false) {
return false;
}
if (!$return) {
echo $buf;
} else {
$buffer .= $buf;
}
}
} else {
/// Downloading locally, write the file contents to the local file handler.
$byteswritten = stream_copy_to_stream($fh, $localfh);
return ($byteswritten == $node->filesize);
}
fclose($fh);
} else {
return false;
}
if ($return) {
return $buffer;
}
exit;
}
/// Process the file, re-writing relative links to direct URLs which will
$filecontents = '';
/// Read the file contents in chunks and output store for processing.
if ($fh = fopen($url, 'r')) {
while (!feof($fh)) {
if (($filecontents .= fread($fh, 8192)) === false) {
return false;
}
}
fclose($fh);
} else {
return false;
}
$this->fix_links($filecontents, $this->get_file_path($node->uuid));
/// We've asked for the file contents to just be returned, so do that now.
if ($return) {
return $filecontents;
}
/// Downloading locally, write the file contents to the local file handler.
if ($downloading) {
if (($byteswritten = fwrite($localfh, $filecontents, strlen($filecontents))) === false) {
return false;
} else {
return true;
}
}
if ($headers = get_headers($url)) {
foreach ($headers as $header) {
if (0 === strpos($header, 'HTTP') ||
0 === strpos($header, 'Server') ||
0 === strpos($header, 'Set-Cookie') ||
0 === strpos($header, 'Connection')) {
continue;
}
header($header);
}
}
/// Cache this file for the required amount of time.
if (!empty($this->config->cache_time)) {
$age = $this->config->cache_time;
} else {
/// The "No" caching option has a value of zero, so
/// this handles the default (not set), as well as selecting "No"
$age = 0;
}
header('Cache-Control: max-age=' . $age);
header('Expires: '. gmdate('D, d M Y H:i:s', time() + $age) .' GMT');
header('Pragma: ');
$cd_header = 'Content-Disposition: ';
if ($attachment) {
$cd_header .= 'attachment; ';
}
header($cd_header .'filename="'. $node->filename .'"');
/// Close session - not needed anymore.
@session_write_close();
echo $filecontents;
exit;
}
