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<?php
namespace iplx\Http;
use Exception;
use InvalidArgumentException;
use RuntimeException;
use Psr\Http\Message\StreamInterface;
class Stream implements StreamInterface
{
protected $stream;
protected $size;
protected $seekable;
protected $readable;
protected $writable;
public function __construct($stream)
{
if (! is_resource($stream)) {
throw new InvalidArgumentException('Invalid stream resource');
}
$this->stream = $stream;
$meta = stream_get_meta_data($this->stream);
$this->seekable = $meta['seekable'];
$this->readable = preg_match('/[r+]/', $meta['mode']) === 1;
$this->writable = preg_match('/[waxc+]/', $meta['mode']) === 1;
}
public function __destruct()
{
$this->close();
}
public function __toString()
{
try {
$this->seek(0);
$contents = stream_get_contents($this->stream);
} catch (Exception $e) {
$contents = '';
}
return $contents;
}
public function close()
{
if (isset($this->stream)) {
if (is_resource($this->stream)) {
fclose($this->stream);
}
$this->detach();
}
}
public function detach()
{
if (! isset($this->stream)) {
return null;
}
$stream = $this->stream;
$this->stream = null;
$this->size = null;
$this->seekable = false;
$this->readable = false;
$this->writable = false;
return $stream;
}
public function getSize()
{
if ($this->size !== null) {
return $this->size;
}
if (! isset($this->stream)) {
return null;
}
$stats = fstat($this->stream);
$this->size = $stats['size'];
return $this->size;
}
public function tell()
{
$this->assertAttached();
$position = ftell($this->stream);
if ($position === false) {
throw new RuntimeException('Unable to determine stream position');
}
return $position;
}
public function eof()
{
$this->assertAttached();
return feof($this->stream);
}
public function isSeekable()
{
return $this->seekable;
}
public function seek($offset, $whence = SEEK_SET)
{
$this->assertSeekable();
if (fseek($this->stream, $offset, $whence) === -1) {
throw new RuntimeException('Unable to seek to stream position');
}
}
public function rewind()
{
$this->seek(0);
}
public function isWritable()
{
return $this->writable;
}
public function write($string)
{
$this->assertWritable();
$written = fwrite($this->stream, $string);
if ($written === false) {
throw new RuntimeException('Unable to write to stream');
}
return $written;
}
public function isReadable()
{
return $this->readable;
}
public function read($length)
{
$this->assertReadable();
$data = fread($this->stream, $length);
if ($data === false) {
throw new RuntimeException('Unable to read from stream');
}
return $data;
}
public function getContents()
{
$this->assertReadable();
$contents = stream_get_contents($this->stream);
if ($contents === false) {
throw new RuntimeException('Unable to read stream contents');
}
return $contents;
}
public function getMetadata($key = null)
{
if (! isset($this->stream)) {
return $key === null ? [] : null;
}
$meta = stream_get_meta_data($this->stream);
if ($key === null) {
return $meta;
}
if (isset($meta[$key])) {
return $meta[$key];
}
return null;
}
public function assertAttached()
{
if (! isset($this->stream)) {
throw new RuntimeException('Stream is detached');
}
}
public function assertSeekable()
{
$this->assertAttached();
if (! $this->isSeekable()) {
throw new RuntimeException('Stream is not seekable');
}
}
public function assertReadable()
{
$this->assertAttached();
if (! $this->isReadable()) {
throw new RuntimeException('Stream is not readable');
}
}
public function assertWritable()
{
$this->assertAttached();
if (! $this->isWritable()) {
throw new RuntimeException('Stream is not writable');
}
}
/**
* Open a stream
*
* @param string $filename
* @param string $mode
*
* @return static
*/
public static function open($filename = 'php://temp', $mode = 'r+')
{
$stream = fopen($filename, $mode);
return new static($stream);
}
/**
* Create a stream
*
* @param StreamInterface|string|resource $resource
*
* @return StreamInterface
*/
public static function create($resource)
{
if ($resource instanceof StreamInterface) {
return $resource;
}
if (is_scalar($resource)) {
$stream = fopen('php://temp', 'r+');
if ($resource !== '') {
fwrite($stream, $resource);
fseek($stream, 0);
}
return new static($stream);
}
if (is_resource($resource)) {
return new static($resource);
}
return static::open();
}
}
|
