/usr/share/ada/adainclude/aws/aws-url-set.adb is in libaws3.3.2-dev 3.3.2-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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-- Ada Web Server --
-- --
-- Copyright (C) 2007-2015, 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. --
------------------------------------------------------------------------------
with Ada.Characters.Handling;
with Ada.Strings.Fixed;
with AWS.Parameters.Set;
with AWS.URL.Raise_URL_Error;
with AWS.Utils;
package body AWS.URL.Set is
function Normalize (Path : Unbounded_String) return Unbounded_String;
-- Returns Path with all possible occurences of parent and current
-- directories removed. Does not raise exception.
---------------------
-- Connection_Data --
---------------------
procedure Connection_Data
(URL : in out Object;
Host : String;
Port : Positive;
Security : Boolean) is
begin
if Host = "" then
URL.Host := To_Unbounded_String ("localhost");
elsif Host (Host'First) = '[' and then Host (Host'Last) = ']' then
URL.Host :=
To_Unbounded_String (Host (Host'First + 1 .. Host'Last - 1));
else
URL.Host := To_Unbounded_String (Host);
end if;
URL.Port := Port;
if Security then
URL.Protocol := HTTPS;
else
URL.Protocol := HTTP;
end if;
end Connection_Data;
---------------
-- Normalize --
---------------
function Normalize (Path : Unbounded_String) return Unbounded_String is
URL_Path : Unbounded_String := Path;
K : Natural;
P : Natural;
begin
-- Checks for current directory and removes all occurences
-- Look for starting ./
if Length (URL_Path) >= 2 and then Slice (URL_Path, 1, 2) = "./" then
Delete (URL_Path, 1, 1);
end if;
-- Look for all // references
K := 1;
loop
K := Index (URL_Path, "//", From => K);
exit when K = 0;
if K > 1 and then Slice (URL_Path, K - 1, K - 1) = ":" then
K := K + 1;
else
Delete (URL_Path, K, K);
end if;
end loop;
-- Look for all /./ references
K := 1;
loop
K := Index (URL_Path, "/./", From => K);
exit when K = 0;
Delete (URL_Path, K, K + 1);
end loop;
-- Checks for parent directory
P := 1;
loop
K := Index (URL_Path, "/../", From => P);
exit when K = 0;
-- Look for previous directory, which should be removed
P := Strings.Fixed.Index
(Slice (URL_Path, 1, K - 1), "/", Strings.Backward);
exit when P = 0;
Delete (URL_Path, P, K + 2);
end loop;
return URL_Path;
end Normalize;
----------------
-- Parameters --
----------------
procedure Parameters (URL : in out Object; Set : AWS.Parameters.List) is
begin
URL.Parameters := Set;
end Parameters;
function Parameters
(URL : not null access Object) return access AWS.Parameters.List is
begin
return URL.Parameters'Unchecked_Access;
end Parameters;
-----------
-- Parse --
-----------
procedure Parse
(Item : in out Object;
URL : String;
Check_Validity : Boolean := True;
Normalize : Boolean := False)
is
FTP_Token : constant String := "ftp:";
HTTP_Token : constant String := "http:";
HTTPS_Token : constant String := "https:";
L_URL : constant String :=
Strings.Fixed.Translate
(URL, Strings.Maps.To_Mapping ("\", "/"));
P, F : Natural;
Scheme : Unbounded_String;
procedure Parse (URL : String);
-- Parse URL, the URL must not contain the HTTP_Token prefix.
-- If a hostname is specified, the URL should start with "//"
function Parse_Scheme (URL : String) return String;
-- Parse the protocol part of the URL and return it. Return an empty
-- string if not found.
-----------
-- Parse --
-----------
procedure Parse (URL : String) is
function "+" (S : String) return Unbounded_String
renames To_Unbounded_String;
procedure Set_Host (First, Last : Positive);
procedure Parse_Path_File (Start : Positive);
-- Parse Path and File URL information starting at position Start in
-- URL.
I1, I2, I3 : Natural;
LB, RB : Natural;
F : Positive;
Authority_Specified : Boolean;
---------------------
-- Parse_Path_File --
---------------------
procedure Parse_Path_File (Start : Positive) is
PF : constant String := URL (Start .. URL'Last);
I3 : constant Natural :=
Strings.Fixed.Index (PF, "/", Strings.Backward);
begin
if I3 = 0 then
-- No '/' so this is certainly a single file. As a special
-- exception we check for current and parent directories
-- which must be part of the path.
declare
File : constant String := URL (Start .. URL'Last);
begin
if File = ".." or else File = "." then
Item.Path := +File;
Item.File := +"";
else
Item.Path := +"";
Item.File := +File;
end if;
end;
else
-- Check that after the last '/' we have not a current or
-- parent directories which must be part of the path.
declare
File : constant String := URL (I3 + 1 .. URL'Last);
begin
if File = ".." or else File = "." then
Item.Path := +URL (Start .. URL'Last);
Item.File := +"";
else
Item.Path := +URL (Start .. I3);
Item.File := +File;
end if;
end;
end if;
end Parse_Path_File;
--------------
-- Set_Host --
--------------
procedure Set_Host (First, Last : Positive) is
begin
if First < Last
and then URL (First) = '['
and then URL (Last) = ']'
then
Item.Host := +URL (First + 1 .. Last - 1);
else
Item.Host := +URL (First .. Last);
end if;
end Set_Host;
begin
Authority_Specified := URL'Length > 2
and then URL (URL'First .. URL'First + 1) = "//";
if not Authority_Specified then
-- No "//", there is no authority (hostname or IP) specified.
-- Let's just parse the data as a path information.
--
-- There no is ambiguity here, the first part cannot be a hostname
-- (the URL would start with "//").
Item.Host := +"";
Parse_Path_File (URL'First);
else
-- The URL starts with "//", so we look up various characters for
-- the authority part. At maximum length it could have:
--
-- //user:pass@host_or_ip:port/
-- | | | |
-- F I1 I3 I2
F := URL'First + 2;
I1 := Strings.Fixed.Index (URL, ":", F);
I2 := Strings.Fixed.Index (URL, "/", F);
I3 := Strings.Fixed.Index (URL, "@", F);
LB := Strings.Fixed.Index (URL, "[", F);
RB := Strings.Fixed.Index (URL, "]", F);
-- Check for [user:password@]
if I1 /= 0 and then I3 /= 0 and then I1 < I3 then
-- We have [user:password@]
Item.User := +URL (F .. I1 - 1);
Item.Password := +URL (I1 + 1 .. I3 - 1);
F := I3 + 1;
-- Check if there is another ':' specified
I1 := Strings.Fixed.Index (URL (F .. URL'Last), ":");
end if;
-- On the previous example, we now have:
--
-- //user:pass@host_or_ip:port/
-- | | |
-- F I1 I2
-- (I3 no longer used)
--
-- If IPv6 address in brackets, the I1 should point to the ':'
-- character right after ']' (port number) or should be 0 (no port
-- number specified). For example we want:
--
-- //optional_user:pass@[IP:6::addr]:port/
-- | || |
-- F, LB RB I1 I2
if LB < RB and then LB > 0 and then (LB < I2 or else I2 = 0) then
if RB < URL'Last and then URL (RB + 1) = ':' then
I1 := RB + 1;
else
I1 := 0;
end if;
end if;
if I1 = 0 then
-- In this case we have not port specified
-- We expect the first string to be the hostname.
if I2 = 0 then
-- No path information, case [user:password@host]
Set_Host (F, URL'Last);
Item.Path := +"/";
else
-- A path, case [user:password@host/path]
Set_Host (F, I2 - 1);
Parse_Path_File (I2);
end if;
elsif I2 = 0 then
-- No path, we have [host:port]
Set_Host (F, I1 - 1);
if Utils.Is_Number (URL (I1 + 1 .. URL'Last)) then
Item.Port := Positive'Value (URL (I1 + 1 .. URL'Last));
else
Raise_URL_Error (Set.Parse.URL, "Port is not valid");
end if;
Item.Path := +"/";
elsif I1 < I2 then
-- Here we have a complete URL [host:port/path]
Set_Host (F, I1 - 1);
if Utils.Is_Number (URL (I1 + 1 .. I2 - 1)) then
Item.Port := Positive'Value (URL (I1 + 1 .. I2 - 1));
else
Raise_URL_Error (Set.Parse.URL, "Port is not valid");
end if;
Parse_Path_File (I2);
else
-- Here we have a complete URL, with no port specified
-- The semicolon is part of the URL [host/path]
Set_Host (F, I2 - 1);
Parse_Path_File (I2);
end if;
end if;
end Parse;
------------------
-- Parse_Scheme --
------------------
function Parse_Scheme (URL : String) return String is
Res : String := URL;
begin
for I in Res'Range loop
case Res (I) is
when 'a' .. 'z' =>
null;
when 'A' .. 'Z' =>
Res (I) := Characters.Handling.To_Lower (Res (I));
when ':' =>
if I > Res'First then
return Res (Res'First .. I - 1);
else
return "";
end if;
when others =>
return "";
end case;
end loop;
return "";
end Parse_Scheme;
begin
Item.Protocol := HTTP;
-- Checks for fragment
F := Strings.Fixed.Index (L_URL, "#");
if F = 0 then
F := L_URL'Last;
Item.Fragment := Null_Unbounded_String;
else
Item.Fragment := To_Unbounded_String (L_URL (F .. L_URL'Last));
F := F - 1;
end if;
-- Checks for parameters
P := Strings.Fixed.Index (L_URL, "?");
if P = 0 then
P := F;
else
AWS.Parameters.Set.Add (Item.Parameters, L_URL (P .. F));
P := P - 1;
end if;
-- Checks for prefix
if Utils.Match (L_URL, HTTP_Token) then
Item.Port := Default_HTTP_Port;
Parse (L_URL (L_URL'First + HTTP_Token'Length .. P));
elsif Utils.Match (L_URL, HTTPS_Token) then
Item.Port := Default_HTTPS_Port;
Parse (L_URL (L_URL'First + HTTPS_Token'Length .. P));
Item.Protocol := HTTPS;
elsif Utils.Match (L_URL, FTP_Token) then
Item.Port := Default_FTP_Port;
Parse (L_URL (L_URL'First + FTP_Token'Length .. P));
Item.Protocol := FTP;
elsif L_URL /= "" then
-- No known scheme detected. Look for a scheme anyway and parse the
-- rest of the URL.
Item.Port := 0;
Scheme := To_Unbounded_String (Parse_Scheme (L_URL));
if Scheme /= Null_Unbounded_String then
Item.Protocol := Scheme;
Parse (L_URL (L_URL'First + Length (Scheme) + 1 .. P));
else
Item.Protocol := Null_Unbounded_String;
Parse (L_URL (L_URL'First .. P));
end if;
else
-- L_URL = ""
Item.Protocol := Null_Unbounded_String;
end if;
-- Normalize the URL path
Item.N_Path := Set.Normalize (Item.Path);
-- Set status
declare
Path_Len : constant Natural := Length (Item.N_Path);
begin
if (Path_Len >= 4 and then Slice (Item.N_Path, 1, 4) = "/../")
or else
(Path_Len = 3 and then Slice (Item.N_Path, 1, 3) = "/..")
then
Item.Status := Wrong;
else
Item.Status := Valid;
end if;
end;
-- If Normalize is activated, the active URL Path is the normalized one
if Normalize then
Item.Path := Item.N_Path;
end if;
-- Raise URL_Error if the URL is suspicious
if Check_Validity and then Item.Status = Wrong then
Raise_URL_Error
(To_String (Item.N_Path),
"Reference Web root parent directory");
end if;
end Parse;
end AWS.URL.Set;
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