File : adagio-upload-resource-factory.adb
------------------------------------------------------------------------------
-- ADAGIO - ADALID - AENEA. --
-- --
-- Copyright (C) 2003 --
-- A. Mosteo. --
-- --
-- Authors: A. Mosteo. (adagio@mosteo.com) --
-- --
-- If you have any questions in regard to this software, please address --
-- them to the above email. --
-- --
-- This program is free software; you can redistribute it and/or modify --
-- it under the terms of the GNU General Public License as published by --
-- the Free Software Foundation; either version 2 of the License, or (at --
-- your option) any later version. --
-- --
-- This program is distributed in the hope that it will be useful, but --
-- WITHOUT 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 --
-- along with this library; if not, write to the Free Software Foundation, --
-- Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. --
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-- You are not allowed to use any part of this code to develop a program --
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------------------------------------------------------------------------------
-- $Id: adagio-upload-resource-factory.adb,v 1.5 2004/01/29 21:47:10 Jano Exp $
-- Obtaining resources from a request string.
with Adagio.File;
with Adagio.Library;
with Adagio.Misc; use Adagio.Misc;
with Adagio.Upload.Resource.File;
with Adagio.Upload.Resource.TTH;
with Strings.Utils; use Strings.Utils;
package body Adagio.Upload.Resource.Factory is
------------------------------------------------------------------------
-- Create --
------------------------------------------------------------------------
-- Returns a resource from a request string.
-- Can raise the exceptions in Adagio.Upload.Resource.
function Create (Request : in String) return Resource.Object_access is
Hash : Ustring;
F : Adagio.File.Object;
use type Adagio.File.Object;
begin
if Contains (Request, "uri-res") then
-- FILE RESOURCES
if Contains (Request, "sha1") then
-- SHA1
Hash := U (Select_field (Request, ':', ' ', 2));
if S (Hash)'Length /= 32 then
raise Malformed_request;
end if;
F := Library.Object.Query_sha1 (S (Hash));
elsif Contains (Request, "ed2k") then
-- ED2K
-- Accept N2R?ed2k: and N2R?urn:ed2k:
Hash := U (Select_field (Request, ':', ' ', 1));
if S (Hash)'Length /= 32 then
Hash := U (Select_field (Request, ':', ' ', 2));
if S (Hash)'Length /= 32 then
raise Malformed_request;
end if;
end if;
F := Library.Object.Query_ed2k (S (Hash));
else
raise Unknown;
end if;
if F = Adagio.File.Null_file then
raise Unavailable;
else
return Resource.Object_access (Upload.Resource.File.Create (F));
end if;
elsif Contains (Request, "/gnutella/tigertree/v3?urn") then
-- TIGERTREE RESOURCES
declare
Hash : String := Select_field (Request, ':', ' ', 3);
begin
if Hash'Length /= 39 then
raise Malformed_request;
end if;
F := Library.Object.Query_TTH (Hash);
end;
if F = Adagio.File.Null_file then
raise Unavailable;
else
return Resource.Object_access (Upload.Resource.TTH.Create (F));
end if;
else
raise Unknown;
end if;
end Create;
end Adagio.Upload.Resource.Factory;