123 lines
6.1 KiB
Ada
123 lines
6.1 KiB
Ada
------------------------------------------------------------------------------
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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) 2000-2001 Ada Core Technologies, Inc. --
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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, 59 Temple Place - Suite 330, Boston, --
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-- MA 02111-1307, 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 is maintained by Ada Core Technologies Inc (http://www.gnat.com). --
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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.
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-- A CGI program is expected to be a short lived program and so it
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-- is adequate to 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
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-- otherwise. Every service used when the CGI environment is not valid
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-- will raise the 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)
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return String;
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-- Returns the cookie value associated with the cookie named Key. If
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-- cookie does not exist, returns an empty string if Required is
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-- False and raises 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
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-- of the CGI. It raises Cookie_Not_Found if there is no such
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-- cookie (i.e. Position > 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
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-- the CGI. It raises Cookie_Not_Found if there is no such cookie
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-- (i.e. Position > 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
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-- to the 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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