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<?php
declare(strict_types=1);
namespace Laminas\Diactoros;
use Psr\Http\Message\MessageInterface;
use Psr\Http\Message\StreamInterface;
use function array_map;
use function array_merge;
use function array_values;
use function gettype;
use function implode;
use function is_array;
use function is_object;
use function is_resource;
use function is_string;
use function preg_match;
use function sprintf;
use function str_replace;
use function strtolower;
use function trim;
/**
* Trait implementing the various methods defined in MessageInterface.
*
* @see https://github.com/php-fig/http-message/tree/master/src/MessageInterface.php
*/
trait MessageTrait
{
/**
* List of all registered headers, as key => array of values.
*
* @var array
* @psalm-var array<non-empty-string, list<string>>
*/
protected $headers = [];
/**
* Map of normalized header name to original name used to register header.
*
* @var array
* @psalm-var array<non-empty-string, non-empty-string>
*/
protected $headerNames = [];
/** @var string */
private $protocol = '1.1';
/** @var StreamInterface */
private $stream;
/**
* Retrieves the HTTP protocol version as a string.
*
* The string MUST contain only the HTTP version number (e.g., "1.1", "1.0").
*
* @return string HTTP protocol version.
*/
public function getProtocolVersion(): string
{
return $this->protocol;
}
/**
* Return an instance with the specified HTTP protocol version.
*
* The version string MUST contain only the HTTP version number (e.g.,
* "1.1", "1.0").
*
* This method MUST be implemented in such a way as to retain the
* immutability of the message, and MUST return an instance that has the
* new protocol version.
*
* @param string $version HTTP protocol version
* @return static
*/
public function withProtocolVersion($version): MessageInterface
{
$this->validateProtocolVersion($version);
$new = clone $this;
$new->protocol = $version;
return $new;
}
/**
* Retrieves all message headers.
*
* The keys represent the header name as it will be sent over the wire, and
* each value is an array of strings associated with the header.
*
* // Represent the headers as a string
* foreach ($message->getHeaders() as $name => $values) {
* echo $name . ": " . implode(", ", $values);
* }
*
* // Emit headers iteratively:
* foreach ($message->getHeaders() as $name => $values) {
* foreach ($values as $value) {
* header(sprintf('%s: %s', $name, $value), false);
* }
* }
*
* @return array Returns an associative array of the message's headers. Each
* key MUST be a header name, and each value MUST be an array of strings.
* @psalm-return array<non-empty-string, list<string>>
*/
public function getHeaders(): array
{
return $this->headers;
}
/**
* Checks if a header exists by the given case-insensitive name.
*
* @param string $header Case-insensitive header name.
* @return bool Returns true if any header names match the given header
* name using a case-insensitive string comparison. Returns false if
* no matching header name is found in the message.
*/
public function hasHeader($header): bool
{
return isset($this->headerNames[strtolower($header)]);
}
/**
* Retrieves a message header value by the given case-insensitive name.
*
* This method returns an array of all the header values of the given
* case-insensitive header name.
*
* If the header does not appear in the message, this method MUST return an
* empty array.
*
* @param string $header Case-insensitive header field name.
* @return string[] An array of string values as provided for the given
* header. If the header does not appear in the message, this method MUST
* return an empty array.
*/
public function getHeader($header): array
{
if (! $this->hasHeader($header)) {
return [];
}
$header = $this->headerNames[strtolower($header)];
return $this->headers[$header];
}
/**
* Retrieves a comma-separated string of the values for a single header.
*
* This method returns all of the header values of the given
* case-insensitive header name as a string concatenated together using
* a comma.
*
* NOTE: Not all header values may be appropriately represented using
* comma concatenation. For such headers, use getHeader() instead
* and supply your own delimiter when concatenating.
*
* If the header does not appear in the message, this method MUST return
* an empty string.
*
* @param string $name Case-insensitive header field name.
* @return string A string of values as provided for the given header
* concatenated together using a comma. If the header does not appear in
* the message, this method MUST return an empty string.
*/
public function getHeaderLine($name): string
{
$value = $this->getHeader($name);
if (empty($value)) {
return '';
}
return implode(',', $value);
}
/**
* Return an instance with the provided header, replacing any existing
* values of any headers with the same case-insensitive name.
*
* While header names are case-insensitive, the casing of the header will
* be preserved by this function, and returned from getHeaders().
*
* This method MUST be implemented in such a way as to retain the
* immutability of the message, and MUST return an instance that has the
* new and/or updated header and value.
*
* @param string $name Case-insensitive header field name.
* @param string|string[] $value Header value(s).
* @return static
* @throws Exception\InvalidArgumentException For invalid header names or values.
*/
public function withHeader($name, $value): MessageInterface
{
$this->assertHeader($name);
$normalized = strtolower($name);
$new = clone $this;
if ($new->hasHeader($name)) {
unset($new->headers[$new->headerNames[$normalized]]);
}
$value = $this->filterHeaderValue($value);
$new->headerNames[$normalized] = $name;
$new->headers[$name] = $value;
return $new;
}
/**
* Return an instance with the specified header appended with the
* given value.
*
* Existing values for the specified header will be maintained. The new
* value(s) will be appended to the existing list. If the header did not
* exist previously, it will be added.
*
* This method MUST be implemented in such a way as to retain the
* immutability of the message, and MUST return an instance that has the
* new header and/or value.
*
* @param string $name Case-insensitive header field name to add.
* @param string|string[] $value Header value(s).
* @return static
* @throws Exception\InvalidArgumentException For invalid header names or values.
*/
public function withAddedHeader($name, $value): MessageInterface
{
$this->assertHeader($name);
if (! $this->hasHeader($name)) {
return $this->withHeader($name, $value);
}
$header = $this->headerNames[strtolower($name)];
$new = clone $this;
$value = $this->filterHeaderValue($value);
$new->headers[$header] = array_merge($this->headers[$header], $value);
return $new;
}
/**
* Return an instance without the specified header.
*
* Header resolution MUST be done without case-sensitivity.
*
* This method MUST be implemented in such a way as to retain the
* immutability of the message, and MUST return an instance that removes
* the named header.
*
* @param string $name Case-insensitive header field name to remove.
* @return static
*/
public function withoutHeader($name): MessageInterface
{
if (! is_string($name) || $name === '' || ! $this->hasHeader($name)) {
return clone $this;
}
$normalized = strtolower($name);
$original = $this->headerNames[$normalized];
$new = clone $this;
unset($new->headers[$original], $new->headerNames[$normalized]);
return $new;
}
/**
* Gets the body of the message.
*
* @return StreamInterface Returns the body as a stream.
*/
public function getBody(): StreamInterface
{
return $this->stream;
}
/**
* Return an instance with the specified message body.
*
* The body MUST be a StreamInterface object.
*
* This method MUST be implemented in such a way as to retain the
* immutability of the message, and MUST return a new instance that has the
* new body stream.
*
* @param StreamInterface $body Body.
* @return static
* @throws Exception\InvalidArgumentException When the body is not valid.
*/
public function withBody(StreamInterface $body): MessageInterface
{
$new = clone $this;
$new->stream = $body;
return $new;
}
/** @param StreamInterface|string|resource $stream */
private function getStream($stream, string $modeIfNotInstance): StreamInterface
{
if ($stream instanceof StreamInterface) {
return $stream;
}
if (! is_string($stream) && ! is_resource($stream)) {
throw new Exception\InvalidArgumentException(
'Stream must be a string stream resource identifier, '
. 'an actual stream resource, '
. 'or a Psr\Http\Message\StreamInterface implementation'
);
}
return new Stream($stream, $modeIfNotInstance);
}
/**
* Filter a set of headers to ensure they are in the correct internal format.
*
* Used by message constructors to allow setting all initial headers at once.
*
* @param array $originalHeaders Headers to filter.
*/
private function setHeaders(array $originalHeaders): void
{
$headerNames = $headers = [];
foreach ($originalHeaders as $header => $value) {
$value = $this->filterHeaderValue($value);
$this->assertHeader($header);
$headerNames[strtolower($header)] = $header;
$headers[$header] = $value;
}
$this->headerNames = $headerNames;
$this->headers = $headers;
}
/**
* Validate the HTTP protocol version
*
* @param string $version
* @throws Exception\InvalidArgumentException On invalid HTTP protocol version.
*/
private function validateProtocolVersion($version): void
{
if (empty($version)) {
throw new Exception\InvalidArgumentException(
'HTTP protocol version can not be empty'
);
}
if (! is_string($version)) {
throw new Exception\InvalidArgumentException(sprintf(
'Unsupported HTTP protocol version; must be a string, received %s',
is_object($version) ? $version::class : gettype($version)
));
}
// HTTP/1 uses a "<major>.<minor>" numbering scheme to indicate
// versions of the protocol, while HTTP/2 does not.
if (! preg_match('#^(1\.[01]|2(\.0)?)$#', $version)) {
throw new Exception\InvalidArgumentException(sprintf(
'Unsupported HTTP protocol version "%s" provided',
$version
));
}
}
/** @return list<string> */
private function filterHeaderValue(mixed $values): array
{
if (! is_array($values)) {
$values = [$values];
}
if ([] === $values) {
throw new Exception\InvalidArgumentException(
'Invalid header value: must be a string or array of strings; '
. 'cannot be an empty array'
);
}
return array_map(static function ($value): string {
HeaderSecurity::assertValid($value);
$value = (string) $value;
// Normalize line folding to a single space (RFC 7230#3.2.4).
$value = str_replace(["\r\n\t", "\r\n "], ' ', $value);
// Remove optional whitespace (OWS, RFC 7230#3.2.3) around the header value.
return trim($value, "\t ");
}, array_values($values));
}
/**
* Ensure header name and values are valid.
*
* @param string $name
* @throws Exception\InvalidArgumentException
*/
private function assertHeader($name): void
{
HeaderSecurity::assertValidName($name);
}
}
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