UploadedFileStream.php

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<?php
 
namespace Wikimedia\ParamValidator\Util;
 
use Exception;
use Psr\Http\Message\StreamInterface;
use RuntimeException;
use Throwable;
use Wikimedia\AtEase\AtEase;
 
class UploadedFileStream implements StreamInterface {
 
    private $fp;
 
    private $size = false;
 
    private static function quietCall( callable $func, array $args, $fail, $msg ) {
        // TODO remove the function_exists check once we drop HHVM support
        if ( function_exists( 'error_clear_last' ) ) {
            error_clear_last();
        }
        $ret = AtEase::quietCall( $func, ...$args );
        if ( $ret === $fail ) {
            $err = error_get_last();
            throw new RuntimeException( "$msg: " . ( $err['message'] ?? 'Unknown error' ) );
        }
        return $ret;
    }
 
    public function __construct( $filename ) {
        $this->fp = self::quietCall( 'fopen', [ $filename, 'r' ], false, 'Failed to open file' );
    }
 
    private function checkOpen() {
        if ( !$this->fp ) {
            throw new RuntimeException( 'Stream is not open' );
        }
    }
 
    public function __destruct() {
        $this->close();
    }
 
    public function __toString() {
        try {
            $this->seek( 0 );
            return $this->getContents();
        } catch ( Exception $ex ) {
            // Not allowed to throw
            return '';
        } catch ( Throwable $ex ) {
            // Not allowed to throw
            return '';
        }
    }
 
    public function close() {
        if ( $this->fp ) {
            // Spec doesn't care about close errors.
            AtEase::quietCall( 'fclose', $this->fp );
            $this->fp = null;
        }
    }
 
    public function detach() {
        $ret = $this->fp;
        $this->fp = null;
        return $ret;
    }
 
    public function getSize() {
        if ( $this->size === false ) {
            $this->size = null;
 
            if ( $this->fp ) {
                // Spec doesn't care about errors here.
                $stat = AtEase::quietCall( 'fstat', $this->fp );
                $this->size = $stat['size'] ?? null;
            }
        }
 
        return $this->size;
    }
 
    public function tell() {
        $this->checkOpen();
        return self::quietCall( 'ftell', [ $this->fp ], -1, 'Cannot determine stream position' );
    }
 
    public function eof() {
        // Spec doesn't care about errors here.
        return !$this->fp || AtEase::quietCall( 'feof', $this->fp );
    }
 
    public function isSeekable() {
        return (bool)$this->fp;
    }
 
    public function seek( $offset, $whence = SEEK_SET ) {
        $this->checkOpen();
        self::quietCall( 'fseek', [ $this->fp, $offset, $whence ], -1, 'Seek failed' );
    }
 
    public function rewind() {
        $this->seek( 0 );
    }
 
    public function isWritable() {
        return false;
    }
 
    public function write( $string ) {
        $this->checkOpen();
        throw new RuntimeException( 'Stream is read-only' );
    }
 
    public function isReadable() {
        return (bool)$this->fp;
    }
 
    public function read( $length ) {
        $this->checkOpen();
        return self::quietCall( 'fread', [ $this->fp, $length ], false, 'Read failed' );
    }
 
    public function getContents() {
        $this->checkOpen();
        return self::quietCall( 'stream_get_contents', [ $this->fp ], false, 'Read failed' );
    }
 
    public function getMetadata( $key = null ) {
        $this->checkOpen();
        $ret = self::quietCall( 'stream_get_meta_data', [ $this->fp ], false, 'Metadata fetch failed' );
        if ( $key !== null ) {
            $ret = $ret[$key] ?? null;
        }
        return $ret;
    }
 
}