gcc/ada/libgnat/g-cgicoo.ads

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT COMPILER COMPONENTS                         --
   4 --                                                                          --
   5 --                       G N A T . C G I . C O O K I E                      --
   6 --                                                                          --
   7 --                                 S p e c                                  --
   8 --                                                                          --
   9 --                     Copyright (C) 2000-2018, AdaCore                     --
  10 --                                                                          --
  11 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  12 -- terms of the  GNU General Public License as published  by the Free Soft- --
  13 -- ware  Foundation;  either version 3,  or (at your option) any later ver- --
  14 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  15 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  16 -- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
  17 --                                                                          --
  18 -- As a special exception under Section 7 of GPL version 3, you are granted --
  19 -- additional permissions described in the GCC Runtime Library Exception,   --
  20 -- version 3.1, as published by the Free Software Foundation.               --
  21 --                                                                          --
  22 -- You should have received a copy of the GNU General Public License and    --
  23 -- a copy of the GCC Runtime Library Exception along with this program;     --
  24 -- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
  25 -- <http://www.gnu.org/licenses/>.                                          --
  26 --                                                                          --
  27 -- GNAT was originally developed  by the GNAT team at  New York University. --
  28 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  29 --                                                                          --
  30 ------------------------------------------------------------------------------
  31
  32 --  This is a package to interface a GNAT program with a Web server via the
  33 --  Common Gateway Interface (CGI). It exports services to deal with Web
  34 --  cookies (piece of information kept in the Web client software).
  35
  36 --  The complete CGI Cookie specification can be found in the RFC2109 at:
  37 --     http://www.ics.uci.edu/pub/ietf/http/rfc2109.txt
  38
  39 --  This package builds up data tables whose memory is not released. A CGI
  40 --  program is expected to be a short lived program and so it is adequate to
  41 --  have the underlying OS free the program on exit.
  42
  43 package GNAT.CGI.Cookie is
  44
  45    --  The package will initialize itself by parsing the HTTP_Cookie runtime
  46    --  CGI environment variable during elaboration but we do not want to raise
  47    --  an exception at this time, so the exception Data_Error is deferred and
  48    --  will be raised when calling any services below (except for Ok).
  49
  50    Cookie_Not_Found : exception;
  51    --  This exception is raised when a specific parameter is not found
  52
  53    procedure Put_Header
  54      (Header : String  := Default_Header;
  55       Force  : Boolean := False);
  56    --  Output standard CGI header by default. This header must be returned
  57    --  back to the server at the very beginning and will be output only for
  58    --  the first call to Put_Header if Force is set to False. This procedure
  59    --  also outputs the Cookies that have been defined. If the program uses
  60    --  the GNAT.CGI.Put_Header service, cookies will not be set.
  61    --
  62    --  Cookies are passed back to the server in the header, the format is:
  63    --
  64    --    Set-Cookie: <key>=<value>; comment=<comment>; domain=<domain>;
  65    --     max_age=<max_age>; path=<path>[; secured]
  66
  67    function Ok return Boolean;
  68    --  Returns True if the CGI cookie environment is valid and False otherwise.
  69    --  Every service used when the CGI environment is not valid will raise the
  70    --  exception Data_Error.
  71
  72    function Count return Natural;
  73    --  Returns the number of cookies received by the CGI
  74
  75    function Value
  76      (Key      : String;
  77       Required : Boolean := False) return String;
  78    --  Returns the cookie value associated with the cookie named Key. If cookie
  79    --  does not exist, returns an empty string if Required is False and raises
  80    --  the exception Cookie_Not_Found otherwise.
  81
  82    function Value (Position : Positive) return String;
  83    --  Returns the value associated with the cookie number Position of the CGI.
  84    --  It raises Cookie_Not_Found if there is no such cookie (i.e. Position >
  85    --  Count)
  86
  87    function Exists (Key : String) return Boolean;
  88    --  Returns True if the cookie named Key exist and False otherwise
  89
  90    function Key (Position : Positive) return String;
  91    --  Returns the key associated with the cookie number Position of the CGI.
  92    --  It raises Cookie_Not_Found if there is no such cookie (i.e. Position >
  93    --  Count)
  94
  95    procedure Set
  96      (Key     : String;
  97       Value   : String;
  98       Comment : String  := "";
  99       Domain  : String  := "";
 100       Max_Age : Natural := Natural'Last;
 101       Path    : String  := "/";
 102       Secure  : Boolean := False);
 103    --  Add a cookie to the list of cookies. This will be sent back to the
 104    --  server by the Put_Header service above.
 105
 106    generic
 107       with procedure
 108         Action
 109           (Key      : String;
 110            Value    : String;
 111            Position : Positive;
 112            Quit     : in out Boolean);
 113    procedure For_Every_Cookie;
 114    --  Iterate through all cookies received from the server and call
 115    --  the Action supplied procedure. The Key, Value parameters are set
 116    --  appropriately, Position is the cookie order in the list, Quit is set to
 117    --  True by default. Quit can be set to False to control the iterator
 118    --  termination.
 119
 120 end GNAT.CGI.Cookie;