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Rev 1 Rev 1441
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     *                         string to send as the filename in the part.
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     *                         string to send as the filename in the part.
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     * @param string $boundary You can optionally provide a specific boundary
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     * @param string $boundary You can optionally provide a specific boundary
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     *
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     *
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     * @throws \InvalidArgumentException
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     * @throws \InvalidArgumentException
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     */
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     */
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    public function __construct(array $elements = [], string $boundary = null)
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    public function __construct(array $elements = [], ?string $boundary = null)
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    {
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    {
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        $this->boundary = $boundary ?: bin2hex(random_bytes(20));
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        $this->boundary = $boundary ?: bin2hex(random_bytes(20));
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        $this->stream = $this->createStream($elements);
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        $this->stream = $this->createStream($elements);
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    }
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    }
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    }
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    }
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    /**
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    /**
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     * Get the headers needed before transferring the content of a POST file
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     * Get the headers needed before transferring the content of a POST file
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     *
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     *
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     * @param array<string, string> $headers
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     * @param string[] $headers
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     */
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     */
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    private function getHeaders(array $headers): string
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    private function getHeaders(array $headers): string
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    {
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    {
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        $str = '';
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        $str = '';
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        foreach ($headers as $key => $value) {
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        foreach ($headers as $key => $value) {
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            $str .= "{$key}: {$value}\r\n";
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            $str .= "{$key}: {$value}\r\n";
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        }
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        }
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        return "--{$this->boundary}\r\n" . trim($str) . "\r\n\r\n";
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        return "--{$this->boundary}\r\n".trim($str)."\r\n\r\n";
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    }
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    }
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    {
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    {
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        $stream = new AppendStream();
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        $stream = new AppendStream();
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        foreach ($elements as $element) {
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        foreach ($elements as $element) {
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            if (!is_array($element)) {
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            if (!is_array($element)) {
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                throw new \UnexpectedValueException("An array is expected");
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                throw new \UnexpectedValueException('An array is expected');
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            }
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            }
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            $this->addElement($stream, $element);
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            $this->addElement($stream, $element);
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        }
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        }
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        $stream->addStream(Utils::streamFor($this->getHeaders($headers)));
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        $stream->addStream(Utils::streamFor($this->getHeaders($headers)));
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        $stream->addStream($body);
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        $stream->addStream($body);
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        $stream->addStream(Utils::streamFor("\r\n"));
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        $stream->addStream(Utils::streamFor("\r\n"));
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    }
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    }
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    /**
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     * @param string[] $headers
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     *
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     * @return array{0: StreamInterface, 1: string[]}
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     */
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    private function createElement(string $name, StreamInterface $stream, ?string $filename, array $headers): array
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    private function createElement(string $name, StreamInterface $stream, ?string $filename, array $headers): array
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    {
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    {
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        // Set a default content-disposition header if one was no provided
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        // Set a default content-disposition header if one was no provided
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        $disposition = $this->getHeader($headers, 'content-disposition');
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        $disposition = self::getHeader($headers, 'content-disposition');
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        if (!$disposition) {
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        if (!$disposition) {
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            $headers['Content-Disposition'] = ($filename === '0' || $filename)
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            $headers['Content-Disposition'] = ($filename === '0' || $filename)
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                ? sprintf(
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                ? sprintf(
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                    'form-data; name="%s"; filename="%s"',
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                    'form-data; name="%s"; filename="%s"',
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                )
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                )
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                : "form-data; name=\"{$name}\"";
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                : "form-data; name=\"{$name}\"";
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        }
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        }
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        // Set a default content-length header if one was no provided
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        // Set a default content-length header if one was no provided
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        $length = $this->getHeader($headers, 'content-length');
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        $length = self::getHeader($headers, 'content-length');
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        if (!$length) {
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        if (!$length) {
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            if ($length = $stream->getSize()) {
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            if ($length = $stream->getSize()) {
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                $headers['Content-Length'] = (string) $length;
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                $headers['Content-Length'] = (string) $length;
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            }
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            }
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        }
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        }
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        // Set a default Content-Type if one was not supplied
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        // Set a default Content-Type if one was not supplied
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        $type = $this->getHeader($headers, 'content-type');
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        $type = self::getHeader($headers, 'content-type');
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        if (!$type && ($filename === '0' || $filename)) {
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            if ($type = MimeType::fromFilename($filename)) {
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                $headers['Content-Type'] = $type;
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        if (!$type && ($filename === '0' || $filename)) {
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            }
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            $headers['Content-Type'] = MimeType::fromFilename($filename) ?? 'application/octet-stream';
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        }
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        }
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        return [$stream, $headers];
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    }
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        return [$stream, $headers];
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    /**
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    }
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     * @param string[] $headers
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     */
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    private function getHeader(array $headers, string $key)
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    private static function getHeader(array $headers, string $key): ?string
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    {
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    {
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        $lowercaseHeader = strtolower($key);
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        $lowercaseHeader = strtolower($key);
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        foreach ($headers as $k => $v) {
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        foreach ($headers as $k => $v) {
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            if (strtolower($k) === $lowercaseHeader) {
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            if (strtolower((string) $k) === $lowercaseHeader) {