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Stream.php
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Stream.php
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<?php declare(strict_types=1);
/*
* This file is part of Polymorphine/Message package.
*
* (c) Shudd3r <q3.shudder@gmail.com>
*
* This source file is subject to the MIT license that is bundled
* with this source code in the file LICENSE.
*/
namespace Polymorphine\Message;
use Psr\Http\Message\StreamInterface;
use Polymorphine\Message\Exception\StreamResourceCallException;
use InvalidArgumentException;
use RuntimeException;
class Stream implements StreamInterface
{
private $resource;
private ?array $metaData;
private ?bool $readable;
private ?bool $writable;
private ?bool $seekable;
/**
* @param resource $resource One of the stream type resources
*
* @see https://www.php.net/manual/en/resource.php
*/
public function __construct($resource)
{
if (!is_resource($resource) || get_resource_type($resource) !== 'stream') {
throw new InvalidArgumentException('Invalid stream resource');
}
$this->resource = $resource;
}
public static function fromResourceUri(string $streamUri, $mode = 'r'): self
{
set_error_handler(function () use ($mode) {
restore_error_handler();
if (preg_match('/^[acrwx](?:\+?[tb]?|[tb]?\+?)$/', $mode)) {
throw new RuntimeException('Invalid stream reference');
}
throw new InvalidArgumentException('Invalid stream resource mode');
}, E_WARNING);
$resource = fopen($streamUri, $mode);
restore_error_handler();
return new self($resource);
}
public static function fromBodyString(string $body): self
{
$stream = new self(fopen('php://temp', 'w+b'));
$stream->write($body);
$stream->rewind();
return $stream;
}
public function __toString(): string
{
try {
$this->rewind();
return $this->getContents();
} catch (RuntimeException $e) {
return '';
}
}
public function close(): void
{
$resource = $this->detach();
if ($resource) { fclose($resource); }
}
public function detach()
{
if (!$this->resource) { return null; }
$resource = $this->resource;
$this->resource = null;
$this->metaData = null;
$this->readable = false;
$this->seekable = false;
$this->writable = false;
return $resource;
}
public function getSize(): ?int
{
return $this->resource ? fstat($this->resource)['size'] : null;
}
public function tell(): int
{
if (!$this->resource) {
throw new RuntimeException('Pointer position not available in detached resource');
}
$position = ftell($this->resource);
if ($position === false) {
throw new StreamResourceCallException('Failed to tell pointer position');
}
return $position;
}
public function eof(): bool
{
return !$this->resource || feof($this->resource);
}
public function isSeekable(): bool
{
if (isset($this->seekable)) { return $this->seekable; }
return $this->seekable = $this->getMetadata('seekable');
}
public function seek($offset, $whence = SEEK_SET): void
{
if (!$this->isSeekable()) {
throw new RuntimeException('Stream is not seekable or detached');
}
$exitCode = fseek($this->resource, $offset, $whence);
if ($exitCode === -1) {
throw new StreamResourceCallException('Failed to seek the stream');
}
}
public function rewind(): void
{
$this->seek(0);
}
public function isWritable(): bool
{
if (isset($this->writable)) { return $this->writable; }
$mode = $this->getMetadata('mode');
$writable = ['w' => true, 'a' => true, 'x' => true, 'c' => true];
return $this->writable = (isset($writable[$mode[0]]) || strstr($mode, '+'));
}
public function write($string): int
{
if (!$this->resource) {
throw new RuntimeException('No resource available; cannot write');
}
if (!$this->isWritable()) {
throw new RuntimeException('Stream is not writable');
}
$bytesWritten = fwrite($this->resource, $string);
if ($bytesWritten === false) {
throw new StreamResourceCallException('Failed writing to stream');
}
return $bytesWritten;
}
public function isReadable(): bool
{
if (isset($this->readable)) { return $this->readable; }
$mode = $this->getMetadata('mode');
return $this->readable = ($mode[0] === 'r' || strstr($mode, '+'));
}
public function read($length): string
{
if (!$this->resource) {
throw new RuntimeException('No resource available; cannot read');
}
if (!$this->isReadable()) {
throw new RuntimeException('Stream is not readable');
}
$streamData = fread($this->resource, $length);
if ($streamData === false) {
throw new StreamResourceCallException('Failed reading from stream');
}
return $streamData;
}
public function getContents(): string
{
if (!$this->isReadable()) {
throw new RuntimeException('Stream is not readable or detached');
}
$streamContents = stream_get_contents($this->resource);
if ($streamContents === false) {
throw new StreamResourceCallException('Failed to retrieve stream contents');
}
return $streamContents;
}
public function getMetadata($key = null)
{
if (!$this->resource) {
return $key ? null : [];
}
$this->metaData ??= stream_get_meta_data($this->resource);
return $key ? $this->metaData[$key] ?? null : $this->metaData;
}
}