Poor man's CI with bitbucket

bitbucket_ci.php

<?php
error_reporting(E_ALL | ~E_NOTICE);

// Config
$url = "https://bitbucket.org/USERNAME/PROJECT/get/master.zip";
$user = "USERNAME";
$pass = "PASSWORD";
$tempfile = "thinkbox-ci.zip";
$target = "./";
$access_key = "ACCESS_KEY";

// Helper
function rrmdir($dir) {
    foreach (glob($dir . '/*') as $file) {
        if (is_dir($file))
            rrmdir($file);
        else
            unlink($file);
    }
    rmdir($dir);
}

// Main code
header("Content-Type: text/plain");

if ($_GET['key'] != $access_key) {
    die("Invalid access key");
}

if (file_exists($tempfile)) {
    die("Temp file exists");
}

// Download to tmp file
echo "download\n";
$fh = fopen($tempfile, 'w');

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_HTTPAUTH, CURLAUTH_BASIC);
curl_setopt($ch, CURLOPT_USERPWD, $user . ":" . $pass);
curl_setopt($ch, CURLOPT_FILE, $fh);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
curl_setopt($ch, CURLOPT_TIMEOUT, 30);
curl_exec($ch);
fclose($fh);

$status_code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
if ($status_code != 200) {
    @unlink($tempfile);
    die("Invalid response code: $status_code");
}

echo "downloaded ".round((filesize($tempfile)/1024.0/1024.0), 3)." mb\n";

// Extract zip
$zip = new ZipArchive;
$zip->open($tempfile);

$rootStat = $zip->statIndex(0);

// Write version
$version = substr($rootStat['name'], strrpos($rootStat['name'], '-') + 1, -1);

echo "version $version\n";
file_put_contents("version.txt", $version);

for ($i = 1; $i < $zip->numFiles; $i++) {
    $stat = $zip->statIndex($i);
    // Strip name
    $name = substr($stat['name'], strlen($rootStat['name']));

    if (substr($name, -1) == '/') {
        // Directory
        $tname = $target.$name;
        if (substr_count($name, '/') == 1) {
            // Initial directory
            echo "clean $name\n";
            @rrmdir($tname);
        }
        echo "mkdir $name\n";
        mkdir($tname);
    } else {
        // Extract file
        echo "extract $name\n";
        $fpIn = $zip->getStream($stat['name']);
        $fpOut = fopen($target.$name, 'w');
        while ($data = fread($fpIn, 1024)) {
            fwrite($fpOut, $data);
        }
        fclose($fpIn);
        fclose($fpOut);
    }
}

// Clean up
echo "cleanup\n";
unlink($tempfile);