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<?php
/**
* Slim Framework (https://slimframework.com)
*
* @license https://github.com/slimphp/Slim/blob/3.x/LICENSE.md (MIT License)
*/
namespace Slim\Http;
use InvalidArgumentException;
use Psr\Http\Message\MessageInterface;
use Psr\Http\Message\StreamInterface;
use Slim\Interfaces\Http\HeadersInterface;
/**
* Abstract message (base class for Request and Response)
*
* This class represents a general HTTP message. It provides common properties and methods for
* the HTTP request and response, as defined in the PSR-7 MessageInterface.
*
* @link https://github.com/php-fig/http-message/blob/master/src/MessageInterface.php
* @see \Slim\Http\Request
* @see \Slim\Http\Response
*/
abstract class Message implements MessageInterface
{
/**
* @var string
*/
protected $protocolVersion = '1.1';
/**
* @var array
*/
protected static $validProtocolVersions = [
'1.0' => true,
'1.1' => true,
'2.0' => true,
'2' => true,
];
/**
* @var HeadersInterface
*/
protected $headers;
/**
* @var StreamInterface
*/
protected $body;
/**
* Disable magic setter to ensure immutability
*/
public function __set($name, $value)
{
// Do nothing
}
/**
* 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
*/
public function getProtocolVersion()
{
return $this->protocolVersion;
}
/**
* 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 $version HTTP protocol version
*
* @return static
*
* @throws InvalidArgumentException if the http version is an invalid number
*/
public function withProtocolVersion($version)
{
if (!isset(self::$validProtocolVersions[$version])) {
throw new InvalidArgumentException(
'Invalid HTTP version. Must be one of: '
. implode(', ', array_keys(self::$validProtocolVersions))
);
}
$clone = clone $this;
$clone->protocolVersion = $version;
return $clone;
}
/**
* Retrieves all message header values.
*
* Returns an associative array of the message's headers.
* Each key MUST be a header name, and each value MUST be an array of strings for that header.
*
* The keys represent the header name as it will be sent over the wire, and
* each value is an array of strings associated with the header.
*
* // Represent the headers as a string
* foreach ($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);
* }
* }
*
* While header names are not case-sensitive, getHeaders() will preserve the
* exact case in which headers were originally specified.
*
* @return array
*/
public function getHeaders()
{
return $this->headers->all();
}
/**
* Checks if a header exists by the given case-insensitive name.
*
* 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.
*
* @param string $name Case-insensitive header field name.
*
* @return bool
*/
public function hasHeader($name)
{
return $this->headers->has($name);
}
/**
* 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 $name Case-insensitive header field name.
*
* @return string[]
*/
public function getHeader($name)
{
return $this->headers->get($name, []);
}
/**
* Retrieves a comma-separated string of the values for a single header.
*
* This method returns a string of 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 $name Case-insensitive header field name.
*
* @return string
*/
public function getHeaderLine($name)
{
return implode(',', $this->headers->get($name, []));
}
/**
* Return an instance with the provided value replacing the specified header.
*
* 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[] $value Header value(s).
*
* @return static
*/
public function withHeader($name, $value)
{
$clone = clone $this;
$clone->headers->set($name, $value);
return $clone;
}
/**
* 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[] $value Header value(s).
*
* @return static
*/
public function withAddedHeader($name, $value)
{
$clone = clone $this;
$clone->headers->add($name, $value);
if ($this instanceof Response && $this->body instanceof NonBufferedBody) {
header(sprintf('%s: %s', $name, $clone->getHeaderLine($name)));
}
return $clone;
}
/**
* 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)
{
$clone = clone $this;
$clone->headers->remove($name);
if ($this instanceof Response && $this->body instanceof NonBufferedBody) {
header_remove($name);
}
return $clone;
}
/**
* Gets the body of the message.
*
* @return StreamInterface Returns the body as a stream.
*/
public function getBody()
{
return $this->body;
}
/**
* 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
*/
public function withBody(StreamInterface $body)
{
$clone = clone $this;
$clone->body = $body;
return $clone;
}
}
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