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<?php
declare(strict_types=1);
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.
*/
public static function toString(MessageInterface $message): string
{
if ($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 => $values) {
if (is_string($name) && 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
*/
public static function bodySummary(MessageInterface $message, int $truncateAt = 120): ?string
{
$body = $message->getBody();
if (!$body->isSeekable() || !$body->isReadable()) {
return null;
}
$size = $body->getSize();
if ($size === 0) {
return null;
}
$body->rewind();
$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) !== 0) {
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): void
{
$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.
*/
public static function parseMessage(string $message): array
{
if (!$message) {
throw new \InvalidArgumentException('Invalid message');
}
$message = ltrim($message, "\r\n");
$messageParts = preg_split("/\r?\n\r?\n/", $message, 2);
if ($messageParts === false || count($messageParts) !== 2) {
throw new \InvalidArgumentException('Invalid message: Missing header delimiter');
}
[$rawHeaders, $body] = $messageParts;
$rawHeaders .= "\r\n"; // Put back the delimiter we split previously
$headerParts = preg_split("/\r?\n/", $rawHeaders, 2);
if ($headerParts === false || count($headerParts) !== 2) {
throw new \InvalidArgumentException('Invalid message: Missing status line');
}
[$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://datatracker.ietf.org/doc/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).
*/
public static function parseRequestUri(string $path, array $headers): string
{
$hostKey = array_filter(array_keys($headers), function ($k) {
// Numeric array keys are converted to int by PHP.
$k = (string) $k;
return strtolower($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.
*/
public static function parseRequest(string $message): RequestInterface
{
$data = self::parseMessage($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.
*/
public static function parseResponse(string $message): ResponseInterface
{
$data = self::parseMessage($message);
// According to https://datatracker.ietf.org/doc/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],
$parts[2] ?? null
);
}
}