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 <?php
 namespace Psr\Http\Message;
 
 /**
  * Value object representing a URI.
  *
  * This interface is meant to represent URIs according to RFC 3986 and to
  * provide methods for most common operations. Additional functionality for
  * working with URIs can be provided on top of the interface or externally.
  * Its primary use is for HTTP requests, but may also be used in other
  * contexts.
  *
  * Instances of this interface are considered immutable; all methods that
  * might change state MUST be implemented such that they retain the internal
  * state of the current instance and return an instance that contains the
  * changed state.
  *
  * Typically the Host header will be also be present in the request message.
  * For server-side requests, the scheme will typically be discoverable in the
  * server parameters.
  *
  * @link http://tools.ietf.org/html/rfc3986 (the URI specification)
  */
 interface UriInterface
 {
     /**
      * Retrieve the scheme component of the URI.
      *
      * If no scheme is present, this method MUST return an empty string.
      *
      * The value returned MUST be normalized to lowercase, per RFC 3986
      * Section 3.1.
      *
      * The trailing ":" character is not part of the scheme and MUST NOT be
      * added.
      *
      * @see https://tools.ietf.org/html/rfc3986#section-3.1
      * @return string The URI scheme.
      */
     public function getScheme();
 
     /**
      * Retrieve the authority component of the URI.
      *
      * If no authority information is present, this method MUST return an empty
      * string.
      *
      * The authority syntax of the URI is:
      *
      * <pre>
      * [user-info@]host[:port]
      * </pre>
      *
      * If the port component is not set or is the standard port for the current
      * scheme, it SHOULD NOT be included.
      *
      * @see https://tools.ietf.org/html/rfc3986#section-3.2
      * @return string The URI authority, in "[user-info@]host[:port]" format.
      */
     public function getAuthority();
 
     /**
      * Retrieve the user information component of the URI.
      *
      * If no user information is present, this method MUST return an empty
      * string.
      *
      * If a user is present in the URI, this will return that value;
      * additionally, if the password is also present, it will be appended to the
      * user value, with a colon (":") separating the values.
      *
      * The trailing "@" character is not part of the user information and MUST
      * NOT be added.
      *
      * @return string The URI user information, in "username[:password]" format.
      */
     public function getUserInfo();
 
     /**
      * Retrieve the host component of the URI.
      *
      * If no host is present, this method MUST return an empty string.
      *
      * The value returned MUST be normalized to lowercase, per RFC 3986
      * Section 3.2.2.
      *
      * @see http://tools.ietf.org/html/rfc3986#section-3.2.2
      * @return string The URI host.
      */
     public function getHost();
 
     /**
      * Retrieve the port component of the URI.
      *
      * If a port is present, and it is non-standard for the current scheme,
      * this method MUST return it as an integer. If the port is the standard port
      * used with the current scheme, this method SHOULD return null.
      *
      * If no port is present, and no scheme is present, this method MUST return
      * a null value.
      *
      * If no port is present, but a scheme is present, this method MAY return
      * the standard port for that scheme, but SHOULD return null.
      *
      * @return null|int The URI port.
      */
     public function getPort();
 
     /**
      * Retrieve the path component of the URI.
      *
      * The path can either be empty or absolute (starting with a slash) or
      * rootless (not starting with a slash). Implementations MUST support all
      * three syntaxes.
      *
      * Normally, the empty path "" and absolute path "/" are considered equal as
      * defined in RFC 7230 Section 2.7.3. But this method MUST NOT automatically
      * do this normalization because in contexts with a trimmed base path, e.g.
      * the front controller, this difference becomes significant. It's the task
      * of the user to handle both "" and "/".
      *
      * The value returned MUST be percent-encoded, but MUST NOT double-encode
      * any characters. To determine what characters to encode, please refer to
      * RFC 3986, Sections 2 and 3.3.
      *
      * As an example, if the value should include a slash ("/") not intended as
      * delimiter between path segments, that value MUST be passed in encoded
      * form (e.g., "%2F") to the instance.
      *
      * @see https://tools.ietf.org/html/rfc3986#section-2
      * @see https://tools.ietf.org/html/rfc3986#section-3.3
      * @return string The URI path.
      */
     public function getPath();
 
     /**
      * Retrieve the query string of the URI.
      *
      * If no query string is present, this method MUST return an empty string.
      *
      * The leading "?" character is not part of the query and MUST NOT be
      * added.
      *
      * The value returned MUST be percent-encoded, but MUST NOT double-encode
      * any characters. To determine what characters to encode, please refer to
      * RFC 3986, Sections 2 and 3.4.
      *
      * As an example, if a value in a key/value pair of the query string should
      * include an ampersand ("&") not intended as a delimiter between values,
      * that value MUST be passed in encoded form (e.g., "%26") to the instance.
      *
      * @see https://tools.ietf.org/html/rfc3986#section-2
      * @see https://tools.ietf.org/html/rfc3986#section-3.4
      * @return string The URI query string.
      */
     public function getQuery();
 
     /**
      * Retrieve the fragment component of the URI.
      *
      * If no fragment is present, this method MUST return an empty string.
      *
      * The leading "#" character is not part of the fragment and MUST NOT be
      * added.
      *
      * The value returned MUST be percent-encoded, but MUST NOT double-encode
      * any characters. To determine what characters to encode, please refer to
      * RFC 3986, Sections 2 and 3.5.
      *
      * @see https://tools.ietf.org/html/rfc3986#section-2
      * @see https://tools.ietf.org/html/rfc3986#section-3.5
      * @return string The URI fragment.
      */
     public function getFragment();
 
     /**
      * Return an instance with the specified scheme.
      *
      * This method MUST retain the state of the current instance, and return
      * an instance that contains the specified scheme.
      *
      * Implementations MUST support the schemes "http" and "https" case
      * insensitively, and MAY accommodate other schemes if required.
      *
      * An empty scheme is equivalent to removing the scheme.
      *
      * @param string $scheme The scheme to use with the new instance.
      * @return static A new instance with the specified scheme.
      * @throws \InvalidArgumentException for invalid or unsupported schemes.
      */
     public function withScheme($scheme);
 
     /**
      * Return an instance with the specified user information.
      *
      * This method MUST retain the state of the current instance, and return
      * an instance that contains the specified user information.
      *
      * Password is optional, but the user information MUST include the
      * user; an empty string for the user is equivalent to removing user
      * information.
      *
      * @param string $user The user name to use for authority.
      * @param null|string $password The password associated with $user.
      * @return static A new instance with the specified user information.
      */
     public function withUserInfo($user, $password = null);
 
     /**
      * Return an instance with the specified host.
      *
      * This method MUST retain the state of the current instance, and return
      * an instance that contains the specified host.
      *
      * An empty host value is equivalent to removing the host.
      *
      * @param string $host The hostname to use with the new instance.
      * @return static A new instance with the specified host.
      * @throws \InvalidArgumentException for invalid hostnames.
      */
     public function withHost($host);
 
     /**
      * Return an instance with the specified port.
      *
      * This method MUST retain the state of the current instance, and return
      * an instance that contains the specified port.
      *
      * Implementations MUST raise an exception for ports outside the
      * established TCP and UDP port ranges.
      *
      * A null value provided for the port is equivalent to removing the port
      * information.
      *
      * @param null|int $port The port to use with the new instance; a null value
      *     removes the port information.
      * @return static A new instance with the specified port.
      * @throws \InvalidArgumentException for invalid ports.
      */
     public function withPort($port);
 
     /**
      * Return an instance with the specified path.
      *
      * This method MUST retain the state of the current instance, and return
      * an instance that contains the specified path.
      *
      * The path can either be empty or absolute (starting with a slash) or
      * rootless (not starting with a slash). Implementations MUST support all
      * three syntaxes.
      *
      * If the path is intended to be domain-relative rather than path relative then
      * it must begin with a slash ("/"). Paths not starting with a slash ("/")
      * are assumed to be relative to some base path known to the application or
      * consumer.
      *
      * Users can provide both encoded and decoded path characters.
      * Implementations ensure the correct encoding as outlined in getPath().
      *
      * @param string $path The path to use with the new instance.
      * @return static A new instance with the specified path.
      * @throws \InvalidArgumentException for invalid paths.
      */
     public function withPath($path);
 
     /**
      * Return an instance with the specified query string.
      *
      * This method MUST retain the state of the current instance, and return
      * an instance that contains the specified query string.
      *
      * Users can provide both encoded and decoded query characters.
      * Implementations ensure the correct encoding as outlined in getQuery().
      *
      * An empty query string value is equivalent to removing the query string.
      *
      * @param string $query The query string to use with the new instance.
      * @return static A new instance with the specified query string.
      * @throws \InvalidArgumentException for invalid query strings.
      */
     public function withQuery($query);
 
     /**
      * Return an instance with the specified URI fragment.
      *
      * This method MUST retain the state of the current instance, and return
      * an instance that contains the specified URI fragment.
      *
      * Users can provide both encoded and decoded fragment characters.
      * Implementations ensure the correct encoding as outlined in getFragment().
      *
      * An empty fragment value is equivalent to removing the fragment.
      *
      * @param string $fragment The fragment to use with the new instance.
      * @return static A new instance with the specified fragment.
      */
     public function withFragment($fragment);
 
     /**
      * Return the string representation as a URI reference.
      *
      * Depending on which components of the URI are present, the resulting
      * string is either a full URI or relative reference according to RFC 3986,
      * Section 4.1. The method concatenates the various components of the URI,
      * using the appropriate delimiters:
      *
      * - If a scheme is present, it MUST be suffixed by ":".
      * - If an authority is present, it MUST be prefixed by "//".
      * - The path can be concatenated without delimiters. But there are two
      *   cases where the path has to be adjusted to make the URI reference
      *   valid as PHP does not allow to throw an exception in __toString():
      *     - If the path is rootless and an authority is present, the path MUST
      *       be prefixed by "/".
      *     - If the path is starting with more than one "/" and no authority is
      *       present, the starting slashes MUST be reduced to one.
      * - If a query is present, it MUST be prefixed by "?".
      * - If a fragment is present, it MUST be prefixed by "#".
      *
      * @see http://tools.ietf.org/html/rfc3986#section-4.1
      * @return string
      */
     public function __toString();
 }