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<?php

namespace GuzzleHttp\Psr7;

use
Psr\Http\Message\MessageInterface;
use
Psr\Http\Message\RequestInterface;
use
Psr\Http\Message\ResponseInterface;

final class
Message
{
   
/**
     * Returns the string representation of an HTTP message.
     *
     * @param MessageInterface $message Message to convert to a string.
     *
     * @return string
     */
   
public static function toString(MessageInterface $message)
    {
        if (
$message instanceof RequestInterface) {
           
$msg = trim($message->getMethod() . ' '
                   
. $message->getRequestTarget())
                .
' HTTP/' . $message->getProtocolVersion();
            if (!
$message->hasHeader('host')) {
               
$msg .= "\r\nHost: " . $message->getUri()->getHost();
            }
        } elseif (
$message instanceof ResponseInterface) {
           
$msg = 'HTTP/' . $message->getProtocolVersion() . ' '
               
. $message->getStatusCode() . ' '
               
. $message->getReasonPhrase();
        } else {
            throw new \
InvalidArgumentException('Unknown message type');
        }

        foreach (
$message->getHeaders() as $name => $values) {
            if (
strtolower($name) === 'set-cookie') {
                foreach (
$values as $value) {
                   
$msg .= "\r\n{$name}: " . $value;
                }
            } else {
               
$msg .= "\r\n{$name}: " . implode(', ', $values);
            }
        }

        return
"{$msg}\r\n\r\n" . $message->getBody();
    }

   
/**
     * Get a short summary of the message body.
     *
     * Will return `null` if the response is not printable.
     *
     * @param MessageInterface $message    The message to get the body summary
     * @param int              $truncateAt The maximum allowed size of the summary
     *
     * @return string|null
     */
   
public static function bodySummary(MessageInterface $message, $truncateAt = 120)
    {
       
$body = $message->getBody();

        if (!
$body->isSeekable() || !$body->isReadable()) {
            return
null;
        }

       
$size = $body->getSize();

        if (
$size === 0) {
            return
null;
        }

       
$summary = $body->read($truncateAt);
       
$body->rewind();

        if (
$size > $truncateAt) {
           
$summary .= ' (truncated...)';
        }

       
// Matches any printable character, including unicode characters:
        // letters, marks, numbers, punctuation, spacing, and separators.
       
if (preg_match('/[^\pL\pM\pN\pP\pS\pZ\n\r\t]/u', $summary)) {
            return
null;
        }

        return
$summary;
    }

   
/**
     * Attempts to rewind a message body and throws an exception on failure.
     *
     * The body of the message will only be rewound if a call to `tell()`
     * returns a value other than `0`.
     *
     * @param MessageInterface $message Message to rewind
     *
     * @throws \RuntimeException
     */
   
public static function rewindBody(MessageInterface $message)
    {
       
$body = $message->getBody();

        if (
$body->tell()) {
           
$body->rewind();
        }
    }

   
/**
     * Parses an HTTP message into an associative array.
     *
     * The array contains the "start-line" key containing the start line of
     * the message, "headers" key containing an associative array of header
     * array values, and a "body" key containing the body of the message.
     *
     * @param string $message HTTP request or response to parse.
     *
     * @return array
     */
   
public static function parseMessage($message)
    {
        if (!
$message) {
            throw new \
InvalidArgumentException('Invalid message');
        }

       
$message = ltrim($message, "\r\n");

       
$messageParts = preg_split("/\r?\n\r?\n/", $message, 2);

        if (
$messageParts === false || count($messageParts) !== 2) {
            throw new \
InvalidArgumentException('Invalid message: Missing header delimiter');
        }

        list(
$rawHeaders, $body) = $messageParts;
       
$rawHeaders .= "\r\n"; // Put back the delimiter we split previously
       
$headerParts = preg_split("/\r?\n/", $rawHeaders, 2);

        if (
$headerParts === false || count($headerParts) !== 2) {
            throw new \
InvalidArgumentException('Invalid message: Missing status line');
        }

        list(
$startLine, $rawHeaders) = $headerParts;

        if (
preg_match("/(?:^HTTP\/|^[A-Z]+ \S+ HTTP\/)(\d+(?:\.\d+)?)/i", $startLine, $matches) && $matches[1] === '1.0') {
           
// Header folding is deprecated for HTTP/1.1, but allowed in HTTP/1.0
           
$rawHeaders = preg_replace(Rfc7230::HEADER_FOLD_REGEX, ' ', $rawHeaders);
        }

       
/** @var array[] $headerLines */
       
$count = preg_match_all(Rfc7230::HEADER_REGEX, $rawHeaders, $headerLines, PREG_SET_ORDER);

       
// If these aren't the same, then one line didn't match and there's an invalid header.
       
if ($count !== substr_count($rawHeaders, "\n")) {
           
// Folding is deprecated, see https://tools.ietf.org/html/rfc7230#section-3.2.4
           
if (preg_match(Rfc7230::HEADER_FOLD_REGEX, $rawHeaders)) {
                throw new \
InvalidArgumentException('Invalid header syntax: Obsolete line folding');
            }

            throw new \
InvalidArgumentException('Invalid header syntax');
        }

       
$headers = [];

        foreach (
$headerLines as $headerLine) {
           
$headers[$headerLine[1]][] = $headerLine[2];
        }

        return [
           
'start-line' => $startLine,
           
'headers' => $headers,
           
'body' => $body,
        ];
    }

   
/**
     * Constructs a URI for an HTTP request message.
     *
     * @param string $path    Path from the start-line
     * @param array  $headers Array of headers (each value an array).
     *
     * @return string
     */
   
public static function parseRequestUri($path, array $headers)
    {
       
$hostKey = array_filter(array_keys($headers), function ($k) {
            return
strtolower($k) === 'host';
        });

       
// If no host is found, then a full URI cannot be constructed.
       
if (!$hostKey) {
            return
$path;
        }

       
$host = $headers[reset($hostKey)][0];
       
$scheme = substr($host, -4) === ':443' ? 'https' : 'http';

        return
$scheme . '://' . $host . '/' . ltrim($path, '/');
    }

   
/**
     * Parses a request message string into a request object.
     *
     * @param string $message Request message string.
     *
     * @return Request
     */
   
public static function parseRequest($message)
    {
       
$data = self::parseMessage($message);
       
$matches = [];
        if (!
preg_match('/^[\S]+\s+([a-zA-Z]+:\/\/|\/).*/', $data['start-line'], $matches)) {
            throw new \
InvalidArgumentException('Invalid request string');
        }
       
$parts = explode(' ', $data['start-line'], 3);
       
$version = isset($parts[2]) ? explode('/', $parts[2])[1] : '1.1';

       
$request = new Request(
           
$parts[0],
           
$matches[1] === '/' ? self::parseRequestUri($parts[1], $data['headers']) : $parts[1],
           
$data['headers'],
           
$data['body'],
           
$version
       
);

        return
$matches[1] === '/' ? $request : $request->withRequestTarget($parts[1]);
    }

   
/**
     * Parses a response message string into a response object.
     *
     * @param string $message Response message string.
     *
     * @return Response
     */
   
public static function parseResponse($message)
    {
       
$data = self::parseMessage($message);
       
// According to https://tools.ietf.org/html/rfc7230#section-3.1.2 the space
        // between status-code and reason-phrase is required. But browsers accept
        // responses without space and reason as well.
       
if (!preg_match('/^HTTP\/.* [0-9]{3}( .*|$)/', $data['start-line'])) {
            throw new \
InvalidArgumentException('Invalid response string: ' . $data['start-line']);
        }
       
$parts = explode(' ', $data['start-line'], 3);

        return new
Response(
            (int)
$parts[1],
           
$data['headers'],
           
$data['body'],
           
explode('/', $parts[0])[1],
            isset(
$parts[2]) ? $parts[2] : null
       
);
    }
}