/**
* Perform a HTTP HEAD or GET request.
*
* If $file_path is a writable filename, this will do a GET request and write
* the file to that path.
*
* @since 2.5.0
*
* @param string $url URL to fetch.
* @param string|bool $file_path Optional. File path to write request to.
* @param int $red (private) The number of Redirects followed, Upon 5 being hit, returns false.
* @return bool|string False on failure and string of headers if HEAD request.
*/
function nxt_get_http($url, $file_path = false, $red = 1)
{
@set_time_limit(60);
if ($red > 5) {
return false;
}
$options = array();
$options['redirection'] = 5;
if (false == $file_path) {
$options['method'] = 'HEAD';
} else {
$options['method'] = 'GET';
}
$response = nxt_remote_request($url, $options);
if (is_nxt_error($response)) {
return false;
}
$headers = nxt_remote_retrieve_headers($response);
$headers['response'] = nxt_remote_retrieve_response_code($response);
// nxt_HTTP no longer follows redirects for HEAD requests.
if ('HEAD' == $options['method'] && in_array($headers['response'], array(301, 302)) && isset($headers['location'])) {
return nxt_get_http($headers['location'], $file_path, ++$red);
}
if (false == $file_path) {
return $headers;
}
// GET request - write it to the supplied filename
$out_fp = fopen($file_path, 'w');
if (!$out_fp) {
return $headers;
}
fwrite($out_fp, nxt_remote_retrieve_body($response));
fclose($out_fp);
clearstatcache();
return $headers;
}
/**
* Attempt to download a remote file attachment
*
* @param string $url URL of item to fetch
* @param array $post Attachment details
* @return array|nxt_Error Local file location details on success, nxt_Error otherwise
*/
function fetch_remote_file($url, $post)
{
// extract the file name and extension from the url
$file_name = basename($url);
// get placeholder file in the upload dir with a unique, sanitized filename
$upload = nxt_upload_bits($file_name, 0, '', $post['upload_date']);
if ($upload['error']) {
return new nxt_Error('upload_dir_error', $upload['error']);
}
// fetch the remote url and write it to the placeholder file
$headers = nxt_get_http($url, $upload['file']);
// request failed
if (!$headers) {
@unlink($upload['file']);
return new nxt_Error('import_file_error', __('Remote server did not respond', 'nxtclass-importer'));
}
// make sure the fetch was successful
if ($headers['response'] != '200') {
@unlink($upload['file']);
return new nxt_Error('import_file_error', sprintf(__('Remote server returned error response %1$d %2$s', 'nxtclass-importer'), esc_html($headers['response']), get_status_header_desc($headers['response'])));
}
$filesize = filesize($upload['file']);
if (isset($headers['content-length']) && $filesize != $headers['content-length']) {
@unlink($upload['file']);
return new nxt_Error('import_file_error', __('Remote file is incorrect size', 'nxtclass-importer'));
}
if (0 == $filesize) {
@unlink($upload['file']);
return new nxt_Error('import_file_error', __('Zero size file downloaded', 'nxtclass-importer'));
}
$max_size = (int) $this->max_attachment_size();
if (!empty($max_size) && $filesize > $max_size) {
@unlink($upload['file']);
return new nxt_Error('import_file_error', sprintf(__('Remote file is too large, limit is %s', 'nxtclass-importer'), size_format($max_size)));
}
// keep track of the old and new urls so we can substitute them later
$this->url_remap[$url] = $upload['url'];
$this->url_remap[$post['guid']] = $upload['url'];
// r13735, really needed?
// keep track of the destination if the remote url is redirected somewhere else
if (isset($headers['x-final-location']) && $headers['x-final-location'] != $url) {
$this->url_remap[$headers['x-final-location']] = $upload['url'];
}
return $upload;
}