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-- Ada Web Server --
-- --
-- Copyright (C) 2000-2014, AdaCore --
-- --
-- This library is free software; you can redistribute it and/or modify --
-- it under terms of the GNU General Public License as published by the --
-- Free Software Foundation; either version 3, or (at your option) any --
-- later version. This library 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. --
-- --
-- As a special exception under Section 7 of GPL version 3, you are --
-- granted additional permissions described in the GCC Runtime Library --
-- Exception, version 3.1, as published by the Free Software Foundation. --
-- --
-- You should have received a copy of the GNU General Public License and --
-- a copy of the GCC Runtime Library Exception along with this program; --
-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
-- <http://www.gnu.org/licenses/>. --
-- --
-- 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. --
------------------------------------------------------------------------------
pragma Ada_2012;
with Ada.Strings.Maps;
with Ada.Strings.Unbounded;
with AWS.Parameters;
package AWS.URL is
use Ada;
-- The general URL form as described in RFC2616 is:
--
-- http_URL = "http:" "//" host [ ":" port ] [ abs_path [ "?" query ]]
--
-- Note also that there are different RFC describing URL like the 2616 and
-- 1738 but they use different terminologies. Here we try to follow the
-- names used in RFC2616 but we have implemented some extensions at the
-- end of this package. For example the way Path and File are separated or
-- the handling of user/password which is explicitly not allowed in the
-- RFC but are used and supported in many browsers. Here are the extended
-- URL supported:
--
-- http://user:pass@www.here.com:80/dir1/dir2/xyz.html?p=8&x=doh#anchor
-- | | | | | | |
-- protocol host port path file parameters fragment
--
-- <-- pathname -->
type Object is private;
URL_Error : exception;
Default_FTP_Port : constant := 21;
Default_HTTP_Port : constant := 80;
Default_HTTPS_Port : constant := 443;
function Parse
(URL : String;
Check_Validity : Boolean := True;
Normalize : Boolean := False) return Object;
-- Parse an URL and return an Object representing this URL. It is then
-- possible to extract each part of the URL with the services bellow.
-- Raises URL_Error if Check_Validity is true and the URL reference a
-- resource above the web root directory.
procedure Normalize (URL : in out Object);
-- Removes all occurrences to parent directory ".." and current directory
-- ".". Raises URL_Error if the URL reference a resource above the Web
-- root directory.
function Is_Valid (URL : Object) return Boolean;
-- Returns True if the URL is valid (does not reference directory above
-- the Web root).
function URL (URL : Object) return String;
-- Returns full URL string, this can be different to the URL passed if it
-- has been normalized.
function Protocol_Name (URL : Object) return String;
-- Returns "http" or "https" depending on the protocol used by URL
function Host
(URL : Object; IPv6_Brackets : Boolean := False) return String;
-- Returns the hostname in IPv6 breakets if necessary
function Port (URL : Object) return Positive;
-- Returns the port as a positive
function Port (URL : Object) return String;
-- Returns the port as a string
function Port_Not_Default (URL : Object) return String;
-- Returns the port image (preceded by character ':') if it is not the
-- default port. Returns the empty string otherwise.
function Abs_Path
(URL : Object;
Encode : Boolean := False) return String;
-- Returns the absolute path. This is the complete resource reference
-- without the query part.
function Query
(URL : Object;
Encode : Boolean := False) return String;
-- Returns the Query part of the URL or the empty string if none was
-- specified. Note that character '?' is not part of the Query and is
-- therefore not returned.
--
-- Below are extended API not part of the RFC 2616 URL specification
--
function User (URL : Object) return String;
-- Returns user name part of the URL. Returns the empty string if user was
-- not specified.
function Password (URL : Object) return String;
-- Returns user's password part of the URL. Returns the empty string if
-- password was not specified.
function Server_Name
(URL : Object; IPv6_Brackets : Boolean := False) return String
renames Host;
function Security (URL : Object) return Boolean;
-- Returns True if it is a Secure HTTP (HTTPS) URL
function Path (URL : Object; Encode : Boolean := False) return String;
-- Returns the Path (including the leading slash). If Encode is True then
-- the URL will be encoded using the Encode routine.
function File (URL : Object; Encode : Boolean := False) return String;
-- Returns the File. If Encode is True then the URL will be encoded using
-- the Encode routine. Not that by File here we mean the latest part of
-- the URL, it could be a real file or a diretory into the filesystem.
-- Parent and current directories are part of the path.
function Parameters
(URL : Object;
Encode : Boolean := False) return String;
-- Returns the Parameters (including the starting ? character). If Encode
-- is True then the URL will be encoded using the Encode routine.
function Pathname
(URL : Object;
Encode : Boolean := False) return String renames Abs_Path;
function Pathname_And_Parameters
(URL : Object;
Encode : Boolean := False) return String;
-- Returns the pathname and the parameters. This is equivalent to:
-- Pathname & Parameters.
function Parameter
(URL : Object; Name : String; N : Positive := 1) return String
with Inline;
-- Returns the Nth value associated with Key into Table. Returns
-- the emptry string if key does not exist.
function Parameters (URL : Object) return AWS.Parameters.List with Inline;
-- Return the parameter list associated with the URL
function Fragment (URL : Object) return String with Inline;
-- Return the part after the # sign (included)
--
-- URL Resolution
--
function Resolve (URL : Object; Base_URL : Object) return Object;
-- Resolve an URL relative to a Base_URL. Uses RFC 3986, section 5.2
-- algorithm.
function Resolve (URL : String; Base_URL : String) return String;
-- Resolve an URL relatively to a Base_URL. Same function as above, but
-- working with Strings.
--
-- URL Encoding and Decoding
--
Default_Encoding_Set : constant Strings.Maps.Character_Set;
function Encode
(Str : String;
Encoding_Set : Strings.Maps.Character_Set := Default_Encoding_Set)
return String;
-- Encode Str into a URL-safe form. Many characters are forbiden into an
-- URL and needs to be encoded. A character is encoded by %XY where XY is
-- the character's ASCII hexadecimal code. For example a space is encoded
-- as %20.
function Decode (Str : String) return String;
-- This is the opposite of Encode above
private
use Ada.Strings.Unbounded;
use type Ada.Strings.Maps.Character_Set;
type Path_Status is (Valid, Wrong);
HTTP : constant Unbounded_String := To_Unbounded_String ("http");
HTTPS : constant Unbounded_String := To_Unbounded_String ("https");
FTP : constant Unbounded_String := To_Unbounded_String ("ftp");
type Object is record
User : Unbounded_String;
Password : Unbounded_String;
Host : Unbounded_String;
Port : Natural := Default_HTTP_Port;
Protocol : Unbounded_String := HTTP;
Path : Unbounded_String; -- Original path
N_Path : Unbounded_String; -- Normalized path
File : Unbounded_String;
Status : Path_Status := Wrong;
Parameters : aliased AWS.Parameters.List;
Fragment : Unbounded_String;
end record;
Default_Encoding_Set : constant Strings.Maps.Character_Set :=
Strings.Maps.To_Set
(Span => (Low => Character'Val (128),
High => Character'Val
(Character'Pos (Character'Last))))
or
Strings.Maps.To_Set
(";/?:@&=+$,<>#%""{}|\^[]`' ");
end AWS.URL;
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