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Edit File : AbstractSerializer.php \| Size : 4.48 KB
<?php /** * @see https://github.com/zendframework/zend-diactoros for the canonical source repository * @copyright Copyright (c) 2015-2018 Zend Technologies USA Inc. (https://www.zend.com) * @license https://github.com/zendframework/zend-diactoros/blob/master/LICENSE.md New BSD License / declare(strict_types=1); namespace Zend\Diactoros; use Psr\Http\Message\StreamInterface; use function array_pop; use function implode; use function ltrim; use function preg_match; use function sprintf; use function str_replace; use function ucwords; /* * Provides base functionality for request and response de/serialization * strategies, including functionality for retrieving a line at a time from * the message, splitting headers from the body, and serializing headers. / abstract class AbstractSerializer { const CR = "\r"; const EOL = "\r\n"; const LF = "\n"; /* * Retrieve a single line from the stream. * * Retrieves a line from the stream; a line is defined as a sequence of * characters ending in a CRLF sequence. * * @throws Exception\DeserializationException if the sequence contains a CR * or LF in isolation, or ends in a CR. / protected static function getLine(StreamInterface $stream) : string { $line = ''; $crFound = false; while (! $stream->eof()) { $char = $stream->read(1); if ($crFound && $char === self::LF) { $crFound = false; break; } // CR NOT followed by LF if ($crFound && $char !== self::LF) { throw Exception\DeserializationException::forUnexpectedCarriageReturn(); } // LF in isolation if (! $crFound && $char === self::LF) { throw Exception\DeserializationException::forUnexpectedLineFeed(); } // CR found; do not append if ($char === self::CR) { $crFound = true; continue; } // Any other character: append $line .= $char; } // CR found at end of stream if ($crFound) { throw Exception\DeserializationException::forUnexpectedEndOfHeaders(); } return $line; } /* * Split the stream into headers and body content. * * Returns an array containing two elements * * - The first is an array of headers * - The second is a StreamInterface containing the body content * * @throws Exception\DeserializationException For invalid headers. / protected static function splitStream(StreamInterface $stream) : array { $headers = []; $currentHeader = false; while ($line = self::getLine($stream)) { if (preg_match(';^(?P<name>[!#$%&\'+.^_`\\|~0-9a-zA-Z-]+):(?P<value>.)$;', $line, $matches)) { $currentHeader = $matches['name']; if (! isset($headers[$currentHeader])) { $headers[$currentHeader] = []; } $headers[$currentHeader][] = ltrim($matches['value']); continue; } if (! $currentHeader) { throw Exception\DeserializationException::forInvalidHeader(); } if (! preg_match('#^[ \t]#', $line)) { throw Exception\DeserializationException::forInvalidHeaderContinuation(); } // Append continuation to last header value found $value = array_pop($headers[$currentHeader]); $headers[$currentHeader][] = $value . ltrim($line); } // use RelativeStream to avoid copying initial stream into memory return [$headers, new RelativeStream($stream, $stream->tell())]; } /* * Serialize headers to string values. / protected static function serializeHeaders(array $headers) : string { $lines = []; foreach ($headers as $header => $values) { $normalized = self::filterHeader($header); foreach ($values as $value) { $lines[] = sprintf('%s: %s', $normalized, $value); } } return implode("\r\n", $lines); } /* * Filter a header name to wordcase */ protected static function filterHeader($header) : string { $filtered = str_replace('-', ' ', $header); $filtered = ucwords($filtered); return str_replace(' ', '-', $filtered); } } Back

Edit File : AbstractSerializer.php | Size : 4.48 KB

<?php
/**
 * @see       https://github.com/zendframework/zend-diactoros for the canonical source repository
 * @copyright Copyright (c) 2015-2018 Zend Technologies USA Inc. (https://www.zend.com)
 * @license   https://github.com/zendframework/zend-diactoros/blob/master/LICENSE.md New BSD License
 */

declare(strict_types=1);

namespace Zend\Diactoros;

use Psr\Http\Message\StreamInterface;

use function array_pop;
use function implode;
use function ltrim;
use function preg_match;
use function sprintf;
use function str_replace;
use function ucwords;

/**
 * Provides base functionality for request and response de/serialization
 * strategies, including functionality for retrieving a line at a time from
 * the message, splitting headers from the body, and serializing headers.
 */
abstract class AbstractSerializer
{
    const CR  = "\r";
    const EOL = "\r\n";
    const LF  = "\n";

/**
     * Retrieve a single line from the stream.
     *
     * Retrieves a line from the stream; a line is defined as a sequence of
     * characters ending in a CRLF sequence.
     *
     * @throws Exception\DeserializationException if the sequence contains a CR
     *     or LF in isolation, or ends in a CR.
     */
    protected static function getLine(StreamInterface $stream) : string
    {
        $line    = '';
        $crFound = false;
        while (! $stream->eof()) {
            $char = $stream->read(1);

if ($crFound && $char === self::LF) {
                $crFound = false;
                break;
            }

// CR NOT followed by LF
            if ($crFound && $char !== self::LF) {
                throw Exception\DeserializationException::forUnexpectedCarriageReturn();
            }

// LF in isolation
            if (! $crFound && $char === self::LF) {
                throw Exception\DeserializationException::forUnexpectedLineFeed();
            }

// CR found; do not append
            if ($char === self::CR) {
                $crFound = true;
                continue;
            }

// Any other character: append
            $line .= $char;
        }

// CR found at end of stream
        if ($crFound) {
            throw Exception\DeserializationException::forUnexpectedEndOfHeaders();
        }

return $line;
    }

/**
     * Split the stream into headers and body content.
     *
     * Returns an array containing two elements
     *
     * - The first is an array of headers
     * - The second is a StreamInterface containing the body content
     *
     * @throws Exception\DeserializationException For invalid headers.
     */
    protected static function splitStream(StreamInterface $stream) : array
    {
        $headers       = [];
        $currentHeader = false;

while ($line = self::getLine($stream)) {
            if (preg_match(';^(?P<name>[!#$%&\'*+.^_`\|~0-9a-zA-Z-]+):(?P<value>.*)$;', $line, $matches)) {
                $currentHeader = $matches['name'];
                if (! isset($headers[$currentHeader])) {
                    $headers[$currentHeader] = [];
                }
                $headers[$currentHeader][] = ltrim($matches['value']);
                continue;
            }

if (! $currentHeader) {
                throw Exception\DeserializationException::forInvalidHeader();
            }

if (! preg_match('#^[ \t]#', $line)) {
                throw Exception\DeserializationException::forInvalidHeaderContinuation();
            }

// Append continuation to last header value found
            $value = array_pop($headers[$currentHeader]);
            $headers[$currentHeader][] = $value . ltrim($line);
        }

// use RelativeStream to avoid copying initial stream into memory
        return [$headers, new RelativeStream($stream, $stream->tell())];
    }

/**
     * Serialize headers to string values.
     */
    protected static function serializeHeaders(array $headers) : string
    {
        $lines = [];
        foreach ($headers as $header => $values) {
            $normalized = self::filterHeader($header);
            foreach ($values as $value) {
                $lines[] = sprintf('%s: %s', $normalized, $value);
            }
        }

return implode("\r\n", $lines);
    }

/**
     * Filter a header name to wordcase
     */
    protected static function filterHeader($header) : string
    {
        $filtered = str_replace('-', ' ', $header);
        $filtered = ucwords($filtered);
        return str_replace(' ', '-', $filtered);
    }
}

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