188 lines
6.9 KiB
PHP
188 lines
6.9 KiB
PHP
<?php
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namespace Psr\Http\Message;
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/**
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* HTTP messages consist of requests from a client to a server and responses
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* from a server to a client. This interface defines the methods common to
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* each.
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*
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* Messages are considered immutable; all methods that might change state MUST
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* be implemented such that they retain the internal state of the current
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* message and return an instance that contains the changed state.
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*
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* @link http://www.ietf.org/rfc/rfc7230.txt
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* @link http://www.ietf.org/rfc/rfc7231.txt
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*/
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interface MessageInterface
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{
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/**
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* Retrieves the HTTP protocol version as a string.
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*
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* The string MUST contain only the HTTP version number (e.g., "1.1", "1.0").
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*
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* @return string HTTP protocol version.
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*/
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public function getProtocolVersion(): string;
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/**
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* Return an instance with the specified HTTP protocol version.
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*
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* The version string MUST contain only the HTTP version number (e.g.,
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* "1.1", "1.0").
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*
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* This method MUST be implemented in such a way as to retain the
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* immutability of the message, and MUST return an instance that has the
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* new protocol version.
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*
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* @param string $version HTTP protocol version
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* @return static
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*/
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public function withProtocolVersion(string $version): MessageInterface;
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/**
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* Retrieves all message header values.
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*
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* The keys represent the header name as it will be sent over the wire, and
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* each value is an array of strings associated with the header.
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*
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* // Represent the headers as a string
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* foreach ($message->getHeaders() as $name => $values) {
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* echo $name . ": " . implode(", ", $values);
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* }
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*
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* // Emit headers iteratively:
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* foreach ($message->getHeaders() as $name => $values) {
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* foreach ($values as $value) {
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* header(sprintf('%s: %s', $name, $value), false);
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* }
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* }
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*
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* While header names are not case-sensitive, getHeaders() will preserve the
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* exact case in which headers were originally specified.
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*
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* @return string[][] Returns an associative array of the message's headers. Each
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* key MUST be a header name, and each value MUST be an array of strings
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* for that header.
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*/
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public function getHeaders(): array;
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/**
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* Checks if a header exists by the given case-insensitive name.
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*
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* @param string $name Case-insensitive header field name.
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* @return bool Returns true if any header names match the given header
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* name using a case-insensitive string comparison. Returns false if
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* no matching header name is found in the message.
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*/
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public function hasHeader(string $name): bool;
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/**
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* Retrieves a message header value by the given case-insensitive name.
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*
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* This method returns an array of all the header values of the given
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* case-insensitive header name.
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*
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* If the header does not appear in the message, this method MUST return an
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* empty array.
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*
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* @param string $name Case-insensitive header field name.
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* @return string[] An array of string values as provided for the given
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* header. If the header does not appear in the message, this method MUST
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* return an empty array.
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*/
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public function getHeader(string $name): array;
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/**
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* Retrieves a comma-separated string of the values for a single header.
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*
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* This method returns all of the header values of the given
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* case-insensitive header name as a string concatenated together using
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* a comma.
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*
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* NOTE: Not all header values may be appropriately represented using
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* comma concatenation. For such headers, use getHeader() instead
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* and supply your own delimiter when concatenating.
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*
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* If the header does not appear in the message, this method MUST return
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* an empty string.
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*
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* @param string $name Case-insensitive header field name.
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* @return string A string of values as provided for the given header
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* concatenated together using a comma. If the header does not appear in
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* the message, this method MUST return an empty string.
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*/
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public function getHeaderLine(string $name): string;
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/**
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* Return an instance with the provided value replacing the specified header.
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*
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* While header names are case-insensitive, the casing of the header will
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* be preserved by this function, and returned from getHeaders().
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*
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* This method MUST be implemented in such a way as to retain the
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* immutability of the message, and MUST return an instance that has the
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* new and/or updated header and value.
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*
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* @param string $name Case-insensitive header field name.
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* @param string|string[] $value Header value(s).
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* @return static
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* @throws \InvalidArgumentException for invalid header names or values.
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*/
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public function withHeader(string $name, $value): MessageInterface;
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/**
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* Return an instance with the specified header appended with the given value.
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*
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* Existing values for the specified header will be maintained. The new
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* value(s) will be appended to the existing list. If the header did not
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* exist previously, it will be added.
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*
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* This method MUST be implemented in such a way as to retain the
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* immutability of the message, and MUST return an instance that has the
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* new header and/or value.
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*
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* @param string $name Case-insensitive header field name to add.
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* @param string|string[] $value Header value(s).
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* @return static
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* @throws \InvalidArgumentException for invalid header names or values.
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*/
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public function withAddedHeader(string $name, $value): MessageInterface;
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/**
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* Return an instance without the specified header.
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*
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* Header resolution MUST be done without case-sensitivity.
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*
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* This method MUST be implemented in such a way as to retain the
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* immutability of the message, and MUST return an instance that removes
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* the named header.
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*
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* @param string $name Case-insensitive header field name to remove.
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* @return static
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*/
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public function withoutHeader(string $name): MessageInterface;
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/**
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* Gets the body of the message.
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*
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* @return StreamInterface Returns the body as a stream.
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*/
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public function getBody(): StreamInterface;
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/**
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* Return an instance with the specified message body.
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*
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* The body MUST be a StreamInterface object.
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*
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* This method MUST be implemented in such a way as to retain the
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* immutability of the message, and MUST return a new instance that has the
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* new body stream.
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*
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* @param StreamInterface $body Body.
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* @return static
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* @throws \InvalidArgumentException When the body is not valid.
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*/
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public function withBody(StreamInterface $body): MessageInterface;
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}
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