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178 | -----------------------------------------------------------------------
-- security-oauth-jwt -- OAuth Java Web Token
-- Copyright (C) 2013, 2017 Stephane Carrez
-- Written by Stephane Carrez (Stephane.Carrez@gmail.com)
--
-- Licensed under the Apache License, Version 2.0 (the "License");
-- you may not use this file except in compliance with the License.
-- You may obtain a copy of the License at
--
-- http://www.apache.org/licenses/LICENSE-2.0
--
-- Unless required by applicable law or agreed to in writing, software
-- distributed under the License is distributed on an "AS IS" BASIS,
-- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-- See the License for the specific language governing permissions and
-- limitations under the License.
-----------------------------------------------------------------------
with Ada.Calendar.Conversions;
with Interfaces.C;
with Util.Encoders;
with Util.Strings;
with Util.Serialize.IO;
with Util.Properties.JSON;
with Util.Log.Loggers;
package body Security.OAuth.JWT is
Log : constant Util.Log.Loggers.Logger := Util.Log.Loggers.Create ("Security.OAuth.JWT");
function Get_Time (From : in Util.Properties.Manager;
Name : in String) return Ada.Calendar.Time;
-- Decode the part using base64url and parse the JSON content into the property manager.
procedure Decode_Part (Into : in out Util.Properties.Manager;
Name : in String;
Data : in String);
function Get_Time (From : in Util.Properties.Manager;
Name : in String) return Ada.Calendar.Time is
Value : constant String := From.Get (Name);
begin
return Ada.Calendar.Conversions.To_Ada_Time (Interfaces.C.long'Value (Value));
end Get_Time;
-- ------------------------------
-- Get the issuer claim from the token (the "iss" claim).
-- ------------------------------
function Get_Issuer (From : in Token) return String is
begin
return From.Claims.Get ("iss");
end Get_Issuer;
-- ------------------------------
-- Get the subject claim from the token (the "sub" claim).
-- ------------------------------
function Get_Subject (From : in Token) return String is
begin
return From.Claims.Get ("sub");
end Get_Subject;
-- ------------------------------
-- Get the audience claim from the token (the "aud" claim).
-- ------------------------------
function Get_Audience (From : in Token) return String is
begin
return From.Claims.Get ("aud");
end Get_Audience;
-- ------------------------------
-- Get the expiration claim from the token (the "exp" claim).
-- ------------------------------
function Get_Expiration (From : in Token) return Ada.Calendar.Time is
begin
return Get_Time (From.Claims, "exp");
end Get_Expiration;
-- ------------------------------
-- Get the not before claim from the token (the "nbf" claim).
-- ------------------------------
function Get_Not_Before (From : in Token) return Ada.Calendar.Time is
begin
return Get_Time (From.Claims, "nbf");
end Get_Not_Before;
-- ------------------------------
-- Get the issued at claim from the token (the "iat" claim).
-- ------------------------------
function Get_Issued_At (From : in Token) return Ada.Calendar.Time is
begin
return Get_Time (From.Claims, "iat");
end Get_Issued_At;
-- ------------------------------
-- Get the authentication time claim from the token (the "auth_time" claim).
-- ------------------------------
function Get_Authentication_Time (From : in Token) return Ada.Calendar.Time is
begin
return Get_Time (From.Claims, "auth_time");
end Get_Authentication_Time;
-- ------------------------------
-- Get the JWT ID claim from the token (the "jti" claim).
-- ------------------------------
function Get_JWT_ID (From : in Token) return String is
begin
return From.Claims.Get ("jti");
end Get_JWT_ID;
-- ------------------------------
-- Get the authorized clients claim from the token (the "azp" claim).
-- ------------------------------
function Get_Authorized_Presenters (From : in Token) return String is
begin
return From.Claims.Get ("azp");
end Get_Authorized_Presenters;
-- ------------------------------
-- Get the claim with the given name from the token.
-- ------------------------------
function Get_Claim (From : in Token;
Name : in String;
Default : in String := "") return String is
begin
return From.Claims.Get (Name, Default);
end Get_Claim;
-- ------------------------------
-- Decode the part using base64url and parse the JSON content into the property manager.
-- ------------------------------
procedure Decode_Part (Into : in out Util.Properties.Manager;
Name : in String;
Data : in String) is
Decoder : constant Util.Encoders.Decoder := Util.Encoders.Create (Util.Encoders.BASE_64_URL);
Content : constant String := Decoder.Decode (Data);
begin
Log.Debug ("Decoding {0}: {1}", Name, Content);
Util.Properties.JSON.Parse_JSON (Into, Content);
end Decode_Part;
-- ------------------------------
-- Decode a string representing an encoded JWT token according to the JWT specification:
--
-- Section 7. Rules for Creating and Validating a JWT
--
-- The JWT token is composed of 3 parts encoded in Base64url and separated by '.' .
-- The first part represents the header, the second part the claims and the last part
-- the signature. The <tt>Decode</tt> operation splits the parts, decodes them,
-- parses the JSON content represented by the header and the claims.
-- The <tt>Decode</tt> operation does not verify the signature (yet!).
--
-- Return the decoded token or raise an exception.
-- ------------------------------
function Decode (Content : in String) return Token is
Pos1 : constant Natural := Util.Strings.Index (Content, '.');
Pos2 : Natural;
Result : Token;
begin
if Pos1 = 0 then
Log.Error ("Invalid JWT token: missing '.' separator. JWT: {0}", Content);
raise Invalid_Token with "Missing header separator";
end if;
Pos2 := Util.Strings.Index (Content, '.', Pos1 + 1);
if Pos2 = 0 then
Log.Error ("Invalid JWT token: missing second '.' separator. JWT: {0}", Content);
raise Invalid_Token with "Missing signature separator";
end if;
Decode_Part (Result.Header, "header", Content (Content'First .. Pos1 - 1));
Decode_Part (Result.Claims, "claims", Content (Pos1 + 1 .. Pos2 - 1));
return Result;
exception
when Util.Serialize.IO.Parse_Error =>
raise Invalid_Token with "Invalid JSON content";
end Decode;
end Security.OAuth.JWT;
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