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<?php
declare(strict_types=1);
namespace Nyholm\Psr7;
use Psr\Http\Message\StreamInterface;
use Symfony\Component\Debug\ErrorHandler as SymfonyLegacyErrorHandler;
use Symfony\Component\ErrorHandler\ErrorHandler as SymfonyErrorHandler;
/**
* @author Michael Dowling and contributors to guzzlehttp/psr7
* @author Tobias Nyholm <tobias.nyholm@gmail.com>
* @author Martijn van der Ven <martijn@vanderven.se>
*
* @final This class should never be extended. See https://github.com/Nyholm/psr7/blob/master/doc/final.md
*/
class Stream implements StreamInterface
{
/** @var resource|null A resource reference */
private $stream;
/** @var bool */
private $seekable;
/** @var bool */
private $readable;
/** @var bool */
private $writable;
/** @var array|mixed|void|bool|null */
private $uri;
/** @var int|null */
private $size;
/** @var array Hash of readable and writable stream types */
private const READ_WRITE_HASH = [
'read' => [
'r' => true, 'w+' => true, 'r+' => true, 'x+' => true, 'c+' => true,
'rb' => true, 'w+b' => true, 'r+b' => true, 'x+b' => true,
'c+b' => true, 'rt' => true, 'w+t' => true, 'r+t' => true,
'x+t' => true, 'c+t' => true, 'a+' => true,
],
'write' => [
'w' => true, 'w+' => true, 'rw' => true, 'r+' => true, 'x+' => true,
'c+' => true, 'wb' => true, 'w+b' => true, 'r+b' => true,
'x+b' => true, 'c+b' => true, 'w+t' => true, 'r+t' => true,
'x+t' => true, 'c+t' => true, 'a' => true, 'a+' => true,
],
];
private function __construct()
{
}
/**
* Creates a new PSR-7 stream.
*
* @param string|resource|StreamInterface $body
*
* @throws \InvalidArgumentException
*/
public static function create($body = ''): StreamInterface
{
if ($body instanceof StreamInterface) {
return $body;
}
if (\is_string($body)) {
$resource = \fopen('php://temp', 'rw+');
\fwrite($resource, $body);
$body = $resource;
}
if (\is_resource($body)) {
$new = new self();
$new->stream = $body;
$meta = \stream_get_meta_data($new->stream);
$new->seekable = $meta['seekable'] && 0 === \fseek($new->stream, 0, \SEEK_CUR);
$new->readable = isset(self::READ_WRITE_HASH['read'][$meta['mode']]);
$new->writable = isset(self::READ_WRITE_HASH['write'][$meta['mode']]);
return $new;
}
throw new \InvalidArgumentException('First argument to Stream::create() must be a string, resource or StreamInterface.');
}
/**
* Closes the stream when the destructed.
*/
public function __destruct()
{
$this->close();
}
/**
* @return string
*/
public function __toString()
{
try {
if ($this->isSeekable()) {
$this->seek(0);
}
return $this->getContents();
} catch (\Throwable $e) {
if (\PHP_VERSION_ID >= 70400) {
throw $e;
}
if (\is_array($errorHandler = \set_error_handler('var_dump'))) {
$errorHandler = $errorHandler[0] ?? null;
}
\restore_error_handler();
if ($e instanceof \Error || $errorHandler instanceof SymfonyErrorHandler || $errorHandler instanceof SymfonyLegacyErrorHandler) {
return \trigger_error((string) $e, \E_USER_ERROR);
}
return '';
}
}
public function close(): void
{
if (isset($this->stream)) {
if (\is_resource($this->stream)) {
\fclose($this->stream);
}
$this->detach();
}
}
public function detach()
{
if (!isset($this->stream)) {
return null;
}
$result = $this->stream;
unset($this->stream);
$this->size = $this->uri = null;
$this->readable = $this->writable = $this->seekable = false;
return $result;
}
private function getUri()
{
if (false !== $this->uri) {
$this->uri = $this->getMetadata('uri') ?? false;
}
return $this->uri;
}
public function getSize(): ?int
{
if (null !== $this->size) {
return $this->size;
}
if (!isset($this->stream)) {
return null;
}
// Clear the stat cache if the stream has a URI
if ($uri = $this->getUri()) {
\clearstatcache(true, $uri);
}
$stats = \fstat($this->stream);
if (isset($stats['size'])) {
$this->size = $stats['size'];
return $this->size;
}
return null;
}
public function tell(): int
{
if (!isset($this->stream)) {
throw new \RuntimeException('Stream is detached');
}
if (false === $result = @\ftell($this->stream)) {
throw new \RuntimeException('Unable to determine stream position: ' . (\error_get_last()['message'] ?? ''));
}
return $result;
}
public function eof(): bool
{
return !isset($this->stream) || \feof($this->stream);
}
public function isSeekable(): bool
{
return $this->seekable;
}
public function seek($offset, $whence = \SEEK_SET): void
{
if (!isset($this->stream)) {
throw new \RuntimeException('Stream is detached');
}
if (!$this->seekable) {
throw new \RuntimeException('Stream is not seekable');
}
if (-1 === \fseek($this->stream, $offset, $whence)) {
throw new \RuntimeException('Unable to seek to stream position "' . $offset . '" with whence ' . \var_export($whence, true));
}
}
public function rewind(): void
{
$this->seek(0);
}
public function isWritable(): bool
{
return $this->writable;
}
public function write($string): int
{
if (!isset($this->stream)) {
throw new \RuntimeException('Stream is detached');
}
if (!$this->writable) {
throw new \RuntimeException('Cannot write to a non-writable stream');
}
// We can't know the size after writing anything
$this->size = null;
if (false === $result = @\fwrite($this->stream, $string)) {
throw new \RuntimeException('Unable to write to stream: ' . (\error_get_last()['message'] ?? ''));
}
return $result;
}
public function isReadable(): bool
{
return $this->readable;
}
public function read($length): string
{
if (!isset($this->stream)) {
throw new \RuntimeException('Stream is detached');
}
if (!$this->readable) {
throw new \RuntimeException('Cannot read from non-readable stream');
}
if (false === $result = @\fread($this->stream, $length)) {
throw new \RuntimeException('Unable to read from stream: ' . (\error_get_last()['message'] ?? ''));
}
return $result;
}
public function getContents(): string
{
if (!isset($this->stream)) {
throw new \RuntimeException('Stream is detached');
}
if (false === $contents = @\stream_get_contents($this->stream)) {
throw new \RuntimeException('Unable to read stream contents: ' . (\error_get_last()['message'] ?? ''));
}
return $contents;
}
/**
* @return mixed
*/
public function getMetadata($key = null)
{
if (!isset($this->stream)) {
return $key ? null : [];
}
$meta = \stream_get_meta_data($this->stream);
if (null === $key) {
return $meta;
}
return $meta[$key] ?? null;
}
}
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