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189 | -----------------------------------------------------------------------
-- security-auth-oauth-facebook -- Facebook OAuth based authentication
-- Copyright (C) 2013, 2014 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 Util.Beans.Objects;
with Util.Beans.Objects.Time;
with Util.Serialize.Mappers.Record_Mapper;
with Util.Http.Rest;
package body Security.Auth.OAuth.Facebook is
--
TIME_SHIFT : constant Duration := 12 * 3600.0;
type Token_Info_Field_Type is (FIELD_APP_ID, FIELD_IS_VALID,
FIELD_EXPIRES, FIELD_ISSUED_AT,
FIELD_USER_ID, FIELD_EMAIL, FIELD_FIRST_NAME,
FIELD_LAST_NAME, FIELD_NAME, FIELD_LOCALE, FIELD_GENDER);
type Token_Info is record
App_Id : Ada.Strings.Unbounded.Unbounded_String;
Is_Valid : Boolean := False;
Expires : Ada.Calendar.Time;
Issued : Ada.Calendar.Time;
User_Id : Ada.Strings.Unbounded.Unbounded_String;
Email : Ada.Strings.Unbounded.Unbounded_String;
Name : Ada.Strings.Unbounded.Unbounded_String;
First_Name : Ada.Strings.Unbounded.Unbounded_String;
Last_Name : Ada.Strings.Unbounded.Unbounded_String;
Locale : Ada.Strings.Unbounded.Unbounded_String;
Gender : Ada.Strings.Unbounded.Unbounded_String;
end record;
type Token_Info_Access is access all Token_Info;
procedure Set_Member (Into : in out Token_Info;
Field : in Token_Info_Field_Type;
Value : in Util.Beans.Objects.Object);
procedure Set_Member (Into : in out Token_Info;
Field : in Token_Info_Field_Type;
Value : in Util.Beans.Objects.Object) is
begin
case Field is
when FIELD_APP_ID =>
Into.App_Id := Util.Beans.Objects.To_Unbounded_String (Value);
when FIELD_IS_VALID =>
Into.Is_Valid := Util.Beans.Objects.To_Boolean (Value);
when FIELD_EXPIRES =>
Into.Expires := Util.Beans.Objects.Time.To_Time (Value);
when FIELD_ISSUED_AT =>
Into.Issued := Util.Beans.Objects.Time.To_Time (Value);
when FIELD_USER_ID =>
Into.User_Id := Util.Beans.Objects.To_Unbounded_String (Value);
when FIELD_EMAIL =>
Into.Email := Util.Beans.Objects.To_Unbounded_String (Value);
when FIELD_NAME =>
Into.Name := Util.Beans.Objects.To_Unbounded_String (Value);
when FIELD_FIRST_NAME =>
Into.First_Name := Util.Beans.Objects.To_Unbounded_String (Value);
when FIELD_LAST_NAME =>
Into.Last_Name := Util.Beans.Objects.To_Unbounded_String (Value);
when FIELD_LOCALE =>
Into.Locale := Util.Beans.Objects.To_Unbounded_String (Value);
when FIELD_GENDER =>
Into.Gender := Util.Beans.Objects.To_Unbounded_String (Value);
end case;
end Set_Member;
package Token_Info_Mapper is
new Util.Serialize.Mappers.Record_Mapper (Element_Type => Token_Info,
Element_Type_Access => Token_Info_Access,
Fields => Token_Info_Field_Type,
Set_Member => Set_Member);
procedure Get_Token_Info is
new Util.Http.Rest.Rest_Get (Element_Mapper => Token_Info_Mapper);
Token_Info_Map : aliased Token_Info_Mapper.Mapper;
-- ------------------------------
-- Initialize the authentication realm.
-- ------------------------------
overriding
procedure Initialize (Realm : in out Manager;
Params : in Parameters'Class;
Provider : in String := PROVIDER_OPENID) is
Client : constant String := Params.Get_Parameter (Provider & ".client_id");
Secret : constant String := Params.Get_Parameter (Provider & ".secret");
begin
Security.Auth.OAuth.Manager (Realm).Initialize (Params, Provider);
Realm.App_Access_Token := To_Unbounded_String (Client & "|" & Secret);
end Initialize;
-- ------------------------------
-- Verify the OAuth access token and retrieve information about the user.
-- ------------------------------
overriding
procedure Verify_Access_Token (Realm : in Manager;
Assoc : in Association;
Request : in Parameters'Class;
Token : in Security.OAuth.Clients.Access_Token_Access;
Result : in out Authentication) is
pragma Unreferenced (Assoc, Request);
use type Ada.Calendar.Time;
T : constant String := Token.Get_Name;
Info : aliased Token_Info;
Now : constant Ada.Calendar.Time := Ada.Calendar.Clock;
begin
Get_Token_Info ("https://graph.facebook.com/debug_token?access_token="
& To_String (Realm.App_Access_Token)
& "&input_token=" & T,
Token_Info_Map'Access,
"/data",
Info'Unchecked_Access);
if not Info.Is_Valid then
Set_Result (Result, INVALID_SIGNATURE, "invalid access token returned");
elsif Info.Issued + TIME_SHIFT < Now then
Set_Result (Result, INVALID_SIGNATURE, "the access token issued more than 1 hour ago");
elsif Info.Expires + TIME_SHIFT < Now then
Set_Result (Result, INVALID_SIGNATURE, "the access token has expored");
elsif Length (Info.User_Id) = 0 then
Set_Result (Result, INVALID_SIGNATURE, "the access token refers to an empty user_id");
elsif Info.App_Id /= Realm.App.Get_Application_Identifier then
Set_Result (Result, INVALID_SIGNATURE,
"the access token was granted for another application");
else
Result.Identity := To_Unbounded_String ("https://graph.facebook.com/");
Append (Result.Identity, Info.User_Id);
Result.Claimed_Id := Result.Identity;
Get_Token_Info ("https://graph.facebook.com/" & To_String (Info.User_Id)
& "?access_token=" & T,
Token_Info_Map'Access,
"",
Info'Unchecked_Access);
Result.Email := Info.Email;
Result.Full_Name := Info.Name;
Result.First_Name := Info.First_Name;
Result.Last_Name := Info.Last_Name;
Result.Language := Info.Locale;
Result.Gender := Info.Gender;
Set_Result (Result, AUTHENTICATED, "authenticated");
end if;
end Verify_Access_Token;
begin
Token_Info_Map.Add_Mapping ("app_id", FIELD_APP_ID);
Token_Info_Map.Add_Mapping ("expires_at", FIELD_EXPIRES);
Token_Info_Map.Add_Mapping ("issued_at", FIELD_ISSUED_AT);
Token_Info_Map.Add_Mapping ("is_valid", FIELD_IS_VALID);
Token_Info_Map.Add_Mapping ("user_id", FIELD_USER_ID);
Token_Info_Map.Add_Mapping ("email", FIELD_EMAIL);
Token_Info_Map.Add_Mapping ("name", FIELD_NAME);
Token_Info_Map.Add_Mapping ("first_name", FIELD_FIRST_NAME);
Token_Info_Map.Add_Mapping ("last_name", FIELD_LAST_NAME);
Token_Info_Map.Add_Mapping ("locale", FIELD_LOCALE);
Token_Info_Map.Add_Mapping ("gender", FIELD_GENDER);
end Security.Auth.OAuth.Facebook;
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