<?php
class Download
{
/**
* Common initialization for download and downloadToFile
* Return file handle to header file
*/
private static function initCurl($url, $timeout, &$head)
{
$ch = curl_init();
if ($ch === false)
Util::traceError('Could not initialize cURL');
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, ceil($timeout / 2));
curl_setopt($ch, CURLOPT_TIMEOUT, $timeout);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
curl_setopt($ch, CURLOPT_AUTOREFERER, true);
curl_setopt($ch, CURLOPT_BINARYTRANSFER, true);
curl_setopt($ch, CURLOPT_MAXREDIRS, 6);
$tmpfile = tempnam('/tmp/', 'bwlp-');
$head = fopen($tmpfile, 'w+b');
if ($head === false)
Util::traceError("Could not open temporary head file $tmpfile for writing.");
curl_setopt($ch, CURLOPT_WRITEHEADER, $head);
return $ch;
}
/**
* Read 10kb from the given file handle, seek to 0 first,
* close the file after reading. Returns data read
*/
private static function getContents($fh)
{
fseek($fh, 0, SEEK_SET);
$data = fread($fh, 10000);
fclose($fh);
return $data;
}
/**
* Download file, obey given timeout in seconds
* Return data on success, false on failure
*/
public static function asString($url, $timeout, &$code)
{
$ch = self::initCurl($url, $timeout, $head);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$data = curl_exec($ch);
$head = self::getContents($head);
if (preg_match('#^HTTP/\d+\.\d+ (\d+) #', $head, $out)) {
$code = (int) $out[1];
} else {
$code = 999;
}
curl_close($ch);
return $data;
}
/**
* Download a file from a URL to file.
*
* @param string $target destination path to download file to
* @param string $url URL of file to download
* @param int $timeout timeout in seconds
* @param int $code HTTP status code passed out by reference
* @return boolean
*/
public static function toFile($target, $url, $timeout, &$code)
{
$fh = fopen($target, 'wb');
if ($fh === false)
Util::traceError("Could not open $target for writing.");
$ch = self::initCurl($url, $timeout, $head);
curl_setopt($ch, CURLOPT_FILE, $fh);
$res = curl_exec($ch);
$head = self::getContents($head);
curl_close($ch);
fclose($fh);
if ($res === false) {
@unlink($target);
return false;
}
if (preg_match_all('#\bHTTP/\d+\.\d+ (\d+) #', $head, $out, PREG_SET_ORDER)) {
$code = (int) $out[count($out)-1][1];
} else {
$code = '999 ' . curl_error($ch);
}
return true;
}
}
