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Mini Shell
<?php
declare(strict_types=1);
namespace GuzzleHttp\Psr7;
use Psr\Http\Message\MessageInterface;
use Psr\Http\Message\StreamInterface;
/**
* Trait implementing functionality common to requests and responses.
*/
trait MessageTrait
{
/** @var array<string, string[]> Map of all registered headers, as original name => array of values */
private $headers = [];
/** @var array<string, string> Map of lowercase header name => original name at registration */
private $headerNames = [];
/** @var string */
private $protocol = '1.1';
/** @var StreamInterface|null */
private $stream;
public function getProtocolVersion(): string
{
return $this->protocol;
}
public function withProtocolVersion($version): MessageInterface
{
if ($this->protocol === $version) {
return $this;
}
$new = clone $this;
$new->protocol = $version;
return $new;
}
public function getHeaders(): array
{
return $this->headers;
}
public function hasHeader($header): bool
{
return isset($this->headerNames[strtolower($header)]);
}
public function getHeader($header): array
{
$header = strtolower($header);
if (!isset($this->headerNames[$header])) {
return [];
}
$header = $this->headerNames[$header];
return $this->headers[$header];
}
public function getHeaderLine($header): string
{
return implode(', ', $this->getHeader($header));
}
public function withHeader($header, $value): MessageInterface
{
$this->assertHeader($header);
$value = $this->normalizeHeaderValue($value);
$normalized = strtolower($header);
$new = clone $this;
if (isset($new->headerNames[$normalized])) {
unset($new->headers[$new->headerNames[$normalized]]);
}
$new->headerNames[$normalized] = $header;
$new->headers[$header] = $value;
return $new;
}
public function withAddedHeader($header, $value): MessageInterface
{
$this->assertHeader($header);
$value = $this->normalizeHeaderValue($value);
$normalized = strtolower($header);
$new = clone $this;
if (isset($new->headerNames[$normalized])) {
$header = $this->headerNames[$normalized];
$new->headers[$header] = array_merge($this->headers[$header], $value);
} else {
$new->headerNames[$normalized] = $header;
$new->headers[$header] = $value;
}
return $new;
}
public function withoutHeader($header): MessageInterface
{
$normalized = strtolower($header);
if (!isset($this->headerNames[$normalized])) {
return $this;
}
$header = $this->headerNames[$normalized];
$new = clone $this;
unset($new->headers[$header], $new->headerNames[$normalized]);
return $new;
}
public function getBody(): StreamInterface
{
if (!$this->stream) {
$this->stream = Utils::streamFor('');
}
return $this->stream;
}
public function withBody(StreamInterface $body): MessageInterface
{
if ($body === $this->stream) {
return $this;
}
$new = clone $this;
$new->stream = $body;
return $new;
}
/**
* @param array<string|int, string|string[]> $headers
*/
private function setHeaders(array $headers): void
{
$this->headerNames = $this->headers = [];
foreach ($headers as $header => $value) {
// Numeric array keys are converted to int by PHP.
$header = (string) $header;
$this->assertHeader($header);
$value = $this->normalizeHeaderValue($value);
$normalized = strtolower($header);
if (isset($this->headerNames[$normalized])) {
$header = $this->headerNames[$normalized];
$this->headers[$header] = array_merge($this->headers[$header], $value);
} else {
$this->headerNames[$normalized] = $header;
$this->headers[$header] = $value;
}
}
}
/**
* @param mixed $value
*
* @return string[]
*/
private function normalizeHeaderValue($value): array
{
if (!is_array($value)) {
return $this->trimAndValidateHeaderValues([$value]);
}
if (count($value) === 0) {
throw new \InvalidArgumentException('Header value can not be an empty array.');
}
return $this->trimAndValidateHeaderValues($value);
}
/**
* Trims whitespace from the header values.
*
* Spaces and tabs ought to be excluded by parsers when extracting the field value from a header field.
*
* header-field = field-name ":" OWS field-value OWS
* OWS = *( SP / HTAB )
*
* @param mixed[] $values Header values
*
* @return string[] Trimmed header values
*
* @see https://tools.ietf.org/html/rfc7230#section-3.2.4
*/
private function trimAndValidateHeaderValues(array $values): array
{
return array_map(function ($value) {
if (!is_scalar($value) && null !== $value) {
throw new \InvalidArgumentException(sprintf(
'Header value must be scalar or null but %s provided.',
is_object($value) ? get_class($value) : gettype($value)
));
}
$trimmed = trim((string) $value, " \t");
$this->assertValue($trimmed);
return $trimmed;
}, array_values($values));
}
/**
* @see https://tools.ietf.org/html/rfc7230#section-3.2
*
* @param mixed $header
*/
private function assertHeader($header): void
{
if (!is_string($header)) {
throw new \InvalidArgumentException(sprintf(
'Header name must be a string but %s provided.',
is_object($header) ? get_class($header) : gettype($header)
));
}
if (! preg_match('/^[a-zA-Z0-9\'`#$%&*+.^_|~!-]+$/', $header)) {
throw new \InvalidArgumentException(
sprintf(
'"%s" is not valid header name',
$header
)
);
}
}
/**
* @see https://tools.ietf.org/html/rfc7230#section-3.2
*
* field-value = *( field-content / obs-fold )
* field-content = field-vchar [ 1*( SP / HTAB ) field-vchar ]
* field-vchar = VCHAR / obs-text
* VCHAR = %x21-7E
* obs-text = %x80-FF
* obs-fold = CRLF 1*( SP / HTAB )
*/
private function assertValue(string $value): void
{
// The regular expression intentionally does not support the obs-fold production, because as
// per RFC 7230#3.2.4:
//
// A sender MUST NOT generate a message that includes
// line folding (i.e., that has any field-value that contains a match to
// the obs-fold rule) unless the message is intended for packaging
// within the message/http media type.
//
// Clients must not send a request with line folding and a server sending folded headers is
// likely very rare. Line folding is a fairly obscure feature of HTTP/1.1 and thus not accepting
// folding is not likely to break any legitimate use case.
if (! preg_match('/^[\x20\x09\x21-\x7E\x80-\xFF]*$/', $value)) {
throw new \InvalidArgumentException(sprintf('"%s" is not valid header value', $value));
}
}
}
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