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Utils.php
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Utils.php
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<?php
namespace App;
use Carbon\Carbon;
use Illuminate\Support\Facades\Auth;
use Ramsey\Uuid\Uuid;
/**
* Small utility functions for App.
*/
class Utils
{
/**
* Count the number of lines in a file.
*
* Useful for progress bars.
*
* @param string $file The filepath to count the lines of.
*
* @return int
*/
public static function countLines($file)
{
$fh = fopen($file, 'rb');
$numLines = 0;
while (!feof($fh)) {
$numLines += substr_count(fread($fh, 8192), "\n");
}
fclose($fh);
return $numLines;
}
/**
* Return the country ISO code for an IP address.
*
* @return string
*/
public static function countryForIP($ip)
{
if (strpos(':', $ip) === false) {
$query = "
SELECT country FROM ip4nets
WHERE INET_ATON(net_number) <= INET_ATON(?)
AND INET_ATON(net_broadcast) >= INET_ATON(?)
ORDER BY INET_ATON(net_number), net_mask DESC LIMIT 1
";
} else {
$query = "
SELECT id FROM ip6nets
WHERE INET6_ATON(net_number) <= INET6_ATON(?)
AND INET6_ATON(net_broadcast) >= INET6_ATON(?)
ORDER BY INET6_ATON(net_number), net_mask DESC LIMIT 1
";
}
$nets = \Illuminate\Support\Facades\DB::select($query, [$ip, $ip]);
if (sizeof($nets) > 0) {
return $nets[0]->country;
}
return 'CH';
}
/**
* Return the country ISO code for the current request.
*/
public static function countryForRequest()
{
$request = \request();
$ip = $request->ip();
return self::countryForIP($ip);
}
/**
* Shortcut to creating a progress bar of a particular format with a particular message.
*
* @param \Illuminate\Console\OutputStyle $output Console output object
* @param int $count Number of progress steps
* @param string $message The description
*
* @return \Symfony\Component\Console\Helper\ProgressBar
*/
public static function createProgressBar($output, $count, $message = null)
{
$bar = $output->createProgressBar($count);
$bar->setFormat(
'%current:7s%/%max:7s% [%bar%] %percent:3s%% %elapsed:7s%/%estimated:-7s% %message% '
);
if ($message) {
$bar->setMessage($message . " ...");
}
$bar->start();
return $bar;
}
/**
* Return the number of days in the month prior to this one.
*
* @return int
*/
public static function daysInLastMonth()
{
$start = new Carbon('first day of last month');
$end = new Carbon('last day of last month');
return $start->diffInDays($end) + 1;
}
/**
* Download a file from the interwebz and store it locally.
*
* @param string $source The source location
* @param string $target The target location
* @param bool $force Force the download (and overwrite target)
*
* @return void
*/
public static function downloadFile($source, $target, $force = false)
{
if (is_file($target) && !$force) {
return;
}
\Log::info("Retrieving {$source}");
$fp = fopen($target, 'w');
$curl = curl_init();
curl_setopt($curl, CURLOPT_URL, $source);
curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($curl, CURLOPT_FILE, $fp);
curl_exec($curl);
if (curl_errno($curl)) {
\Log::error("Request error on {$source}: " . curl_error($curl));
curl_close($curl);
fclose($fp);
unlink($target);
return;
}
curl_close($curl);
fclose($fp);
}
/**
* Calculate the broadcast address provided a net number and a prefix.
*
* @param string $net A valid IPv6 network number.
* @param int $prefix The network prefix.
*
* @return string
*/
public static function ip6Broadcast($net, $prefix)
{
$netHex = bin2hex(inet_pton($net));
// Overwriting first address string to make sure notation is optimal
$net = inet_ntop(hex2bin($netHex));
// Calculate the number of 'flexible' bits
$flexbits = 128 - $prefix;
// Build the hexadecimal string of the last address
$lastAddrHex = $netHex;
// We start at the end of the string (which is always 32 characters long)
$pos = 31;
while ($flexbits > 0) {
// Get the character at this position
$orig = substr($lastAddrHex, $pos, 1);
// Convert it to an integer
$origval = hexdec($orig);
// OR it with (2^flexbits)-1, with flexbits limited to 4 at a time
$newval = $origval | (pow(2, min(4, $flexbits)) - 1);
// Convert it back to a hexadecimal character
$new = dechex($newval);
// And put that character back in the string
$lastAddrHex = substr_replace($lastAddrHex, $new, $pos, 1);
// We processed one nibble, move to previous position
$flexbits -= 4;
$pos -= 1;
}
// Convert the hexadecimal string to a binary string
# Using pack() here
# Newer PHP version can use hex2bin()
$lastaddrbin = pack('H*', $lastAddrHex);
// And create an IPv6 address from the binary string
$lastaddrstr = inet_ntop($lastaddrbin);
return $lastaddrstr;
}
/**
* Provide all unique combinations of elements in $input, with order and duplicates irrelevant.
*
* @param array $input The input array of elements.
*
* @return array[]
*/
public static function powerSet(array $input): array
{
$output = [];
for ($x = 0; $x < count($input); $x++) {
self::combine($input, $x + 1, 0, [], 0, $output);
}
return $output;
}
/**
* Returns the current user's email address or null.
*
* @return string
*/
public static function userEmailOrNull(): ?string
{
$user = Auth::user();
if (!$user) {
return null;
}
return $user->email;
}
/**
* Returns a UUID in the form of an integer.
*
* @return integer
*/
public static function uuidInt(): int
{
$hex = Uuid::uuid4();
$bin = pack('h*', str_replace('-', '', $hex));
$ids = unpack('L', $bin);
$id = array_shift($ids);
return $id;
}
/**
* Returns a UUID in the form of a string.
*
* @return string
*/
public static function uuidStr(): string
{
return Uuid::uuid4()->toString();
}
private static function combine($input, $r, $index, $data, $i, &$output): void
{
$n = count($input);
// Current cobination is ready
if ($index == $r) {
$output[] = array_slice($data, 0, $r);
return;
}
// When no more elements are there to put in data[]
if ($i >= $n) {
return;
}
// current is included, put next at next location
$data[$index] = $input[$i];
self::combine($input, $r, $index + 1, $data, $i + 1, $output);
// current is excluded, replace it with next (Note that i+1
// is passed, but index is not changed)
self::combine($input, $r, $index, $data, $i + 1, $output);
}
/**
* Create self URL
*
* @param string $route Route/Path
*
* @return string Full URL
*/
public static function serviceUrl(string $route): string
{
$url = \config('app.public_url');
if (!$url) {
$url = \config('app.url');
}
return rtrim(trim($url, '/') . '/' . ltrim($route, '/'), '/');
}
/**
* Create a configuration/environment data to be passed to
* the UI
*
* @todo For a lack of better place this is put here for now
*
* @return array Configuration data
*/
public static function uiEnv(): array
{
$opts = ['app.name', 'app.url', 'app.domain'];
$env = \app('config')->getMany($opts);
$countries = include resource_path('countries.php');
$env['countries'] = $countries ?: [];
$isAdmin = strpos(request()->getHttpHost(), 'admin.') === 0;
$env['jsapp'] = $isAdmin ? 'admin.js' : 'user.js';
$env['paymentProvider'] = \config('services.payment_provider');
$env['stripePK'] = \config('services.stripe.public_key');
return $env;
}
}

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