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<?php declare(strict_types=1); namespace GuzzleHttp\Psr7; use Psr\Http\Message\StreamInterface; /** * PHP stream implementation. */ class Stream implements StreamInterface { /** * @see https://www.php.net/manual/en/function.fopen.php * @see https://www.php.net/manual/en/function.gzopen.php */ private const READABLE_MODES = '/r|a\+|ab\+|w\+|wb\+|x\+|xb\+|c\+|cb\+/'; private const WRITABLE_MODES = '/a|w|r\+|rb\+|rw|x|c/'; /** @var resource */ private $stream; /** @var int|null */ private $size; /** @var bool */ private $seekable; /** @var bool */ private $readable; /** @var bool */ private $writable; /** @var string|null */ private $uri; /** @var mixed[] */ private $customMetadata; /** * This constructor accepts an associative array of options. * * - size: (int) If a read stream would otherwise have an indeterminate * size, but the size is known due to foreknowledge, then you can * provide that size, in bytes. * - metadata: (array) Any additional metadata to return when the metadata * of the stream is accessed. * * @param resource $stream Stream resource to wrap. * @param array{size?: int, metadata?: array} $options Associative array of options. * * @throws \InvalidArgumentException if the stream is not a stream resource */ public function __construct($stream, array $options = []) { if (!is_resource($stream)) { throw new \InvalidArgumentException('Stream must be a resource'); } if (isset($options['size'])) { $this->size = $options['size']; } $this->customMetadata = $options['metadata'] ?? []; $this->stream = $stream; $meta = stream_get_meta_data($this->stream); $this->seekable = $meta['seekable']; $this->readable = (bool) preg_match(self::READABLE_MODES, $meta['mode']); $this->writable = (bool) preg_match(self::WRITABLE_MODES, $meta['mode']); $this->uri = $this->getMetadata('uri'); } /** * Closes the stream when the destructed */ public function __destruct() { $this->close(); } public function __toString(): string { try { if ($this->isSeekable()) { $this->seek(0); } return $this->getContents(); } catch (\Throwable $e) { if (\PHP_VERSION_ID >= 70400) { throw $e; } trigger_error(sprintf('%s::__toString exception: %s', self::class, (string) $e), E_USER_ERROR); return ''; } } public function getContents(): string { if (!isset($this->stream)) { throw new \RuntimeException('Stream is detached'); } if (!$this->readable) { throw new \RuntimeException('Cannot read from non-readable stream'); } return Utils::tryGetContents($this->stream); } 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 $result; } public function getSize(): ?int { if ($this->size !== null) { return $this->size; } if (!isset($this->stream)) { return null; } // Clear the stat cache if the stream has a URI if ($this->uri) { clearstatcache(true, $this->uri); } $stats = fstat($this->stream); if (is_array($stats) && isset($stats['size'])) { $this->size = $stats['size']; return $this->size; } return null; } public function isReadable(): bool { return $this->readable; } public function isWritable(): bool { return $this->writable; } public function isSeekable(): bool { return $this->seekable; } public function eof(): bool { if (!isset($this->stream)) { throw new \RuntimeException('Stream is detached'); } return feof($this->stream); } public function tell(): int { if (!isset($this->stream)) { throw new \RuntimeException('Stream is detached'); } $result = ftell($this->stream); if ($result === false) { throw new \RuntimeException('Unable to determine stream position'); } return $result; } public function rewind(): void { $this->seek(0); } public function seek($offset, $whence = SEEK_SET): void { $whence = (int) $whence; if (!isset($this->stream)) { throw new \RuntimeException('Stream is detached'); } if (!$this->seekable) { throw new \RuntimeException('Stream is not seekable'); } if (fseek($this->stream, $offset, $whence) === -1) { throw new \RuntimeException('Unable to seek to stream position ' .$offset.' with whence '.var_export($whence, true)); } } public function read($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 ($length < 0) { throw new \RuntimeException('Length parameter cannot be negative'); } if (0 === $length) { return ''; } try { $string = fread($this->stream, $length); } catch (\Exception $e) { throw new \RuntimeException('Unable to read from stream', 0, $e); } if (false === $string) { throw new \RuntimeException('Unable to read from stream'); } return $string; } public function write($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; $result = fwrite($this->stream, $string); if ($result === false) { throw new \RuntimeException('Unable to write to stream'); } return $result; } /** * @return mixed */ public function getMetadata($key = null) { if (!isset($this->stream)) { return $key ? null : []; } elseif (!$key) { return $this->customMetadata + stream_get_meta_data($this->stream); } elseif (isset($this->customMetadata[$key])) { return $this->customMetadata[$key]; } $meta = stream_get_meta_data($this->stream); return $meta[$key] ?? null; } }
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