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------------------------------------------------------------------------------
-- --
-- GNAT COMPILER COMPONENTS --
-- --
-- G N A T . C G I . C O O K I E --
-- --
-- S p e c --
-- --
-- Copyright (C) 2000-2001 Ada Core Technologies, Inc. --
-- --
-- GNAT is free software; you can redistribute it and/or modify it under --
-- terms of the GNU General Public License as published by the Free Soft- --
-- ware Foundation; either version 2, or (at your option) any later ver- --
-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
-- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
-- for more details. You should have received a copy of the GNU General --
-- Public License distributed with GNAT; see file COPYING. If not, write --
-- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
-- MA 02111-1307, USA. --
-- --
-- As a special exception, if other files instantiate generics from this --
-- unit, or you link this unit with other files to produce an executable, --
-- this unit does not by itself cause the resulting executable to be --
-- covered by the GNU General Public License. This exception does not --
-- however invalidate any other reasons why the executable file might be --
-- covered by the GNU Public License. --
-- --
-- GNAT was originally developed by the GNAT team at New York University. --
-- Extensive contributions were provided by Ada Core Technologies Inc. --
-- --
------------------------------------------------------------------------------
-- This is a package to interface a GNAT program with a Web server via the
-- Common Gateway Interface (CGI). It exports services to deal with Web
-- cookies (piece of information kept in the Web client software).
-- The complete CGI Cookie specification can be found in the RFC2109 at:
-- http://www.ics.uci.edu/pub/ietf/http/rfc2109.txt
-- This package builds up data tables whose memory is not released.
-- A CGI program is expected to be a short lived program and so it
-- is adequate to have the underlying OS free the program on exit.
package GNAT.CGI.Cookie is
-- The package will initialize itself by parsing the HTTP_Cookie runtime
-- CGI environment variable during elaboration but we do not want to raise
-- an exception at this time, so the exception Data_Error is deferred and
-- will be raised when calling any services below (except for Ok).
Cookie_Not_Found : exception;
-- This exception is raised when a specific parameter is not found.
procedure Put_Header
(Header : String := Default_Header;
Force : Boolean := False);
-- Output standard CGI header by default. This header must be returned
-- back to the server at the very beginning and will be output only for
-- the first call to Put_Header if Force is set to False. This procedure
-- also outputs the Cookies that have been defined. If the program uses
-- the GNAT.CGI.Put_Header service, cookies will not be set.
--
-- Cookies are passed back to the server in the header, the format is:
--
-- Set-Cookie: <key>=<value>; comment=<comment>; domain=<domain>;
-- max_age=<max_age>; path=<path>[; secured]
function Ok return Boolean;
-- Returns True if the CGI cookie environment is valid and False
-- otherwise. Every service used when the CGI environment is not valid
-- will raise the exception Data_Error.
function Count return Natural;
-- Returns the number of cookies received by the CGI.
function Value
(Key : String;
Required : Boolean := False)
return String;
-- Returns the cookie value associated with the cookie named Key. If
-- cookie does not exist, returns an empty string if Required is
-- False and raises the exception Cookie_Not_Found otherwise.
function Value (Position : Positive) return String;
-- Returns the value associated with the cookie number Position
-- of the CGI. It raises Cookie_Not_Found if there is no such
-- cookie (i.e. Position > Count)
function Exists (Key : String) return Boolean;
-- Returns True if the cookie named Key exist and False otherwise.
function Key (Position : Positive) return String;
-- Returns the key associated with the cookie number Position of
-- the CGI. It raises Cookie_Not_Found if there is no such cookie
-- (i.e. Position > Count)
procedure Set
(Key : String;
Value : String;
Comment : String := "";
Domain : String := "";
Max_Age : Natural := Natural'Last;
Path : String := "/";
Secure : Boolean := False);
-- Add a cookie to the list of cookies. This will be sent back
-- to the server by the Put_Header service above.
generic
with procedure
Action
(Key : String;
Value : String;
Position : Positive;
Quit : in out Boolean);
procedure For_Every_Cookie;
-- Iterate through all cookies received from the server and call
-- the Action supplied procedure. The Key, Value parameters are set
-- appropriately, Position is the cookie order in the list, Quit is set to
-- True by default. Quit can be set to False to control the iterator
-- termination.
end GNAT.CGI.Cookie;
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