<?php

/**
 * Copyright (c) 2019 Wikimedia Foundation.
 *
 * This file is partly derived from PSR-7, which requires the following copyright notice:
 *
 * Copyright (c) 2014 PHP Framework Interoperability Group
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 * @file
 */

namespace MediaWiki\Rest;

use Psr\Http\Message\StreamInterface;
use Psr\Http\Message\UriInterface;

/**
 * A request interface similar to PSR-7's ServerRequestInterface
 */
interface RequestInterface {
	// RequestInterface

	/**
	 * Retrieves the HTTP method of the request.
	 *
	 * @return string Returns the request method.
	 */
	function getMethod();

	/**
	 * Retrieves the URI instance.
	 *
	 * This method MUST return a UriInterface instance.
	 *
	 * @link http://tools.ietf.org/html/rfc3986#section-4.3
	 * @return UriInterface Returns a UriInterface instance
	 *     representing the URI of the request.
	 */
	function getUri();

	// MessageInterface

	/**
	 * 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.
	 */
	function getProtocolVersion();

	/**
	 * Retrieves all message header values.
	 *
	 * 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.
	 *
	 * A single header value may be a string containing a comma-separated list.
	 * Lists will not necessarily be split into arrays. See the comment on
	 * HeaderContainer::convertToListAndString().
	 *
	 * @return string[][] 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.
	 */
	function getHeaders();

	/**
	 * 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.
	 *
	 * A single header value may be a string containing a comma-separated list.
	 * Lists will not necessarily be split into arrays. See the comment on
	 * HeaderContainer::convertToListAndString().
	 *
	 * @param string $name 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.
	 */
	function getHeader( $name );

	/**
	 * Checks if a header exists by the given case-insensitive name.
	 *
	 * @param string $name Case-insensitive header field 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.
	 */
	function hasHeader( $name );

	/**
	 * 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.
	 */
	function getHeaderLine( $name );

	/**
	 * Gets the body of the message.
	 *
	 * @return StreamInterface Returns the body as a stream.
	 */
	function getBody();

	// ServerRequestInterface

	/**
	 * Retrieve server parameters.
	 *
	 * Retrieves data related to the incoming request environment,
	 * typically derived from PHP's $_SERVER superglobal. The data IS NOT
	 * REQUIRED to originate from $_SERVER.
	 *
	 * @return array
	 */
	function getServerParams();

	/**
	 * Retrieve cookies.
	 *
	 * Retrieves cookies sent by the client to the server.
	 *
	 * The data MUST be compatible with the structure of the $_COOKIE
	 * superglobal.
	 *
	 * @return array
	 */
	function getCookieParams();

	/**
	 * Retrieve query string arguments.
	 *
	 * Retrieves the deserialized query string arguments, if any.
	 *
	 * Note: the query params might not be in sync with the URI or server
	 * params. If you need to ensure you are only getting the original
	 * values, you may need to parse the query string from `getUri()->getQuery()`
	 * or from the `QUERY_STRING` server param.
	 *
	 * @return array
	 */
	function getQueryParams();

	/**
	 * Retrieve normalized file upload data.
	 *
	 * This method returns upload metadata in a normalized tree, with each leaf
	 * an instance of Psr\Http\Message\UploadedFileInterface.
	 *
	 * @return array An array tree of UploadedFileInterface instances; an empty
	 *     array MUST be returned if no data is present.
	 */
	function getUploadedFiles();

	/**
	 * Retrieve attributes derived from the request.
	 *
	 * The request "attributes" may be used to allow injection of any
	 * parameters derived from the request: e.g., the results of path
	 * match operations; the results of decrypting cookies; the results of
	 * deserializing non-form-encoded message bodies; etc. Attributes
	 * will be application and request specific, and CAN be mutable.
	 *
	 * @return array Attributes derived from the request.
	 */
	function getAttributes();

	/**
	 * Retrieve a single derived request attribute.
	 *
	 * Retrieves a single derived request attribute as described in
	 * getAttributes(). If the attribute has not been previously set, returns
	 * the default value as provided.
	 *
	 * This method obviates the need for a hasAttribute() method, as it allows
	 * specifying a default value to return if the attribute is not found.
	 *
	 * @see getAttributes()
	 * @param string $name The attribute name.
	 * @param mixed|null $default Default value to return if the attribute does not exist.
	 * @return mixed
	 */
	function getAttribute( $name, $default = null );

	// MediaWiki extensions to PSR-7

	/**
	 * Erase all attributes from the object and set the attribute array to the
	 * specified value
	 *
	 * @param mixed[] $attributes
	 */
	function setAttributes( $attributes );

	/**
	 * Get the current cookie prefix
	 *
	 * @return string
	 */
	function getCookiePrefix();

	/**
	 * Add the cookie prefix to a specified cookie name and get the value of
	 * the resulting prefixed cookie. If the cookie does not exist, $default
	 * is returned.
	 *
	 * @param string $name
	 * @param mixed|null $default
	 * @return mixed The cookie value as a string, or $default
	 */
	function getCookie( $name, $default = null );

	/**
	 * Retrieve POST form parameters.
	 *
	 * This will return an array of parameters in the format of $_POST.
	 *
	 * @return array The deserialized POST parameters
	 */
	function getPostParams();
}