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1 281 jeremybenn
------------------------------------------------------------------------------
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--                                                                          --
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--                         GNAT COMPILER COMPONENTS                         --
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--                                                                          --
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--                       G N A T . C G I . C O O K I E                      --
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--                                                                          --
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--                                 S p e c                                  --
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--                                                                          --
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--                     Copyright (C) 2000-2005, AdaCore                     --
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--                                                                          --
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-- GNAT is free software;  you can  redistribute it  and/or modify it under --
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-- terms of the  GNU General Public License as published  by the Free Soft- --
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-- ware  Foundation;  either version 2,  or (at your option) any later ver- --
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-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
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-- for  more details.  You should have  received  a copy of the GNU General --
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-- Public License  distributed with GNAT;  see file COPYING.  If not, write --
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-- to  the  Free Software Foundation,  51  Franklin  Street,  Fifth  Floor, --
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-- Boston, MA 02110-1301, USA.                                              --
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--                                                                          --
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-- As a special exception,  if other files  instantiate  generics from this --
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-- unit, or you link  this unit with other files  to produce an executable, --
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-- this  unit  does not  by itself cause  the resulting  executable  to  be --
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-- covered  by the  GNU  General  Public  License.  This exception does not --
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-- however invalidate  any other reasons why  the executable file  might be --
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-- covered by the  GNU Public License.                                      --
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--                                                                          --
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-- GNAT was originally developed  by the GNAT team at  New York University. --
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-- Extensive contributions were provided by Ada Core Technologies Inc.      --
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--                                                                          --
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------------------------------------------------------------------------------
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--  This is a package to interface a GNAT program with a Web server via the
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--  Common Gateway Interface (CGI). It exports services to deal with Web
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--  cookies (piece of information kept in the Web client software).
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--  The complete CGI Cookie specification can be found in the RFC2109 at:
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--     http://www.ics.uci.edu/pub/ietf/http/rfc2109.txt
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--  This package builds up data tables whose memory is not released. A CGI
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--  program is expected to be a short lived program and so it is adequate to
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--  have the underlying OS free the program on exit.
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package GNAT.CGI.Cookie is
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   --  The package will initialize itself by parsing the HTTP_Cookie runtime
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   --  CGI environment variable during elaboration but we do not want to raise
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   --  an exception at this time, so the exception Data_Error is deferred and
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   --  will be raised when calling any services below (except for Ok).
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   Cookie_Not_Found : exception;
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   --  This exception is raised when a specific parameter is not found
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   procedure Put_Header
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     (Header : String  := Default_Header;
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      Force  : Boolean := False);
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   --  Output standard CGI header by default. This header must be returned
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   --  back to the server at the very beginning and will be output only for
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   --  the first call to Put_Header if Force is set to False. This procedure
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   --  also outputs the Cookies that have been defined. If the program uses
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   --  the GNAT.CGI.Put_Header service, cookies will not be set.
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   --
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   --  Cookies are passed back to the server in the header, the format is:
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   --
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   --    Set-Cookie: <key>=<value>; comment=<comment>; domain=<domain>;
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   --     max_age=<max_age>; path=<path>[; secured]
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   function Ok return Boolean;
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   --  Returns True if the CGI cookie environment is valid and False otherwise.
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   --  Every service used when the CGI environment is not valid will raise the
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   --  exception Data_Error.
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   function Count return Natural;
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   --  Returns the number of cookies received by the CGI
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   function Value
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     (Key      : String;
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      Required : Boolean := False) return String;
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   --  Returns the cookie value associated with the cookie named Key. If cookie
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   --  does not exist, returns an empty string if Required is False and raises
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   --  the exception Cookie_Not_Found otherwise.
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   function Value (Position : Positive) return String;
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   --  Returns the value associated with the cookie number Position of the CGI.
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   --  It raises Cookie_Not_Found if there is no such cookie (i.e. Position >
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   --  Count)
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   function Exists (Key : String) return Boolean;
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   --  Returns True if the cookie named Key exist and False otherwise
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   function Key (Position : Positive) return String;
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   --  Returns the key associated with the cookie number Position of the CGI.
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   --  It raises Cookie_Not_Found if there is no such cookie (i.e. Position >
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   --  Count)
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   procedure Set
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     (Key     : String;
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      Value   : String;
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      Comment : String  := "";
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      Domain  : String  := "";
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      Max_Age : Natural := Natural'Last;
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      Path    : String  := "/";
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      Secure  : Boolean := False);
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   --  Add a cookie to the list of cookies. This will be sent back to the
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   --  server by the Put_Header service above.
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   generic
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      with procedure
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        Action
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          (Key      : String;
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           Value    : String;
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           Position : Positive;
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           Quit     : in out Boolean);
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   procedure For_Every_Cookie;
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   --  Iterate through all cookies received from the server and call
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   --  the Action supplied procedure. The Key, Value parameters are set
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   --  appropriately, Position is the cookie order in the list, Quit is set to
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   --  True by default. Quit can be set to False to control the iterator
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   --  termination.
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end GNAT.CGI.Cookie;

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