// ***************************************************************************
//
// Delphi MVC Framework
//
// Copyright (c) 2010-2016 Daniele Teti and the DMVCFramework Team
//
// https://github.com/danieleteti/delphimvcframework
//
// ***************************************************************************
//
// 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.
//
// *************************************************************************** }
unit MVCFramework.Middleware.Authentication;
interface
uses
MVCFramework, MVCFramework.Commons, MVCFramework.Logger,
System.Generics.Collections;
type
TMVCBasicAuthenticationMiddleware = class(TInterfacedObject, IMVCMiddleware)
strict private
FMVCAuthenticationHandler: IMVCAuthenticationHandler;
protected
FRealm: string;
procedure OnBeforeRouting(Context: TWebContext; var Handled: Boolean);
procedure OnAfterControllerAction(Context: TWebContext;
const AActionName: string; const Handled: Boolean);
procedure OnBeforeControllerAction(Context: TWebContext;
const AControllerQualifiedClassName: string; const AActionName: string;
var Handled: Boolean);
public
constructor Create(AMVCAuthenticationHandler: IMVCAuthenticationHandler;
Realm: string = 'DelphiMVCFramework REALM'); virtual;
end;
implementation
uses
System.SysUtils, MVCFramework.Session
{$IF CompilerVersion >= 21}
, System.NetEncoding
{$ELSE}
, Soap.EncdDecd
{$ENDIF};
{
401 Unauthorized response should be used for missing or bad authentication, and a
403 Forbidden response should be used afterwards, when the user is authenticated
but isn’t authorized to perform the requested operation on the given resource.
}
const
CONTENT_HTML_FORMAT = '%s
%s
';
CONTENT_401_NOT_AUTHORIZED = '401: Not authorized';
CONTENT_403_FORBIDDEN = '403: Forbidden';
function Base64DecodeString(const Value: String): String; inline;
begin
{$IF CompilerVersion >= 21}
Result := TNetEncoding.Base64.Decode(Value);
{$ELSE}
Result := DecodeString(Value);
{$ENDIF}
end;
{ TMVCSalutationMiddleware }
constructor TMVCBasicAuthenticationMiddleware.Create(AMVCAuthenticationHandler
: IMVCAuthenticationHandler; Realm: string);
begin
inherited Create;
FMVCAuthenticationHandler := AMVCAuthenticationHandler;
FRealm := Realm;
end;
procedure TMVCBasicAuthenticationMiddleware.OnAfterControllerAction
(Context: TWebContext; const AActionName: string; const Handled: Boolean);
begin
// do nothing
end;
procedure TMVCBasicAuthenticationMiddleware.OnBeforeControllerAction
(Context: TWebContext; const AControllerQualifiedClassName,
AActionName: string; var Handled: Boolean);
var
LAuth: string;
LPieces: TArray;
LRoles: TList;
LIsValid: Boolean;
LIsAuthorized: Boolean;
LAuthRequired: Boolean;
LSessionData: TSessionData;
LPair: TPair;
procedure SendWWWAuthenticate;
begin
Context.LoggedUser.Clear;
if Context.Request.ClientPreferHTML then
begin
Context.Response.ContentType := 'text/html';
Context.Response.RawWebResponse.Content :=
Format(CONTENT_HTML_FORMAT, [CONTENT_401_NOT_AUTHORIZED, Context.Config[TMVCConfigKey.ServerName]]);
end
else
begin
Context.Response.ContentType := 'text/plain';
Context.Response.RawWebResponse.Content := CONTENT_401_NOT_AUTHORIZED + sLineBreak + Context.Config[TMVCConfigKey.ServerName];
end;
Context.Response.StatusCode := 401;
Context.Response.SetCustomHeader('WWW-Authenticate',
'Basic realm=' + QuotedStr(FRealm));
Handled := true;
end;
procedure Send403Forbidden;
begin
Context.LoggedUser.Clear;
if Context.Request.ClientPreferHTML then
begin
Context.Response.ContentType := 'text/html';
Context.Response.RawWebResponse.Content :=
Format(CONTENT_HTML_FORMAT, [CONTENT_403_FORBIDDEN, Context.Config[TMVCConfigKey.ServerName]]);
end
else
begin
Context.Response.ContentType := 'text/plain';
Context.Response.RawWebResponse.Content := CONTENT_403_FORBIDDEN + sLineBreak + Context.Config[TMVCConfigKey.ServerName];
end;
Context.Response.StatusCode := 403;
Handled := true;
end;
begin
// check if the resource is protected
FMVCAuthenticationHandler.OnRequest(AControllerQualifiedClassName,
AActionName, LAuthRequired);
if not LAuthRequired then
begin
Handled := False;
Exit;
end;
Context.LoggedUser.LoadFromSession(Context.Session);
if not Context.LoggedUser.IsValid then
begin
// We NEED authentication
LAuth := Context.Request.Headers['Authorization'];
LAuth := Base64DecodeString(LAuth.Remove(0, 'Basic'.Length).Trim);
LPieces := LAuth.Split([':']);
if LAuth.IsEmpty or (Length(LPieces) <> 2) then
begin
SendWWWAuthenticate;
Exit;
end;
// now, we have username and password.
// check the authorization for the requested resource
LRoles := TList.Create;
try
LSessionData := TSessionData.Create;
try
FMVCAuthenticationHandler.OnAuthentication(LPieces[0], LPieces[1],
LRoles, LIsValid, LSessionData);
if LIsValid then
begin
Context.LoggedUser.Roles.AddRange(LRoles);
Context.LoggedUser.UserName := LPieces[0];
Context.LoggedUser.LoggedSince := Now;
Context.LoggedUser.Realm := FRealm;
Context.LoggedUser.SaveToSession(Context.Session);
// save sessiondata to the actual session
for LPair in LSessionData do
begin
Context.Session[LPair.Key] := LPair.Value;
end;
end;
finally
LSessionData.Free;
end;
finally
LRoles.Free;
end;
end;
// authorization
LIsAuthorized := False;
if LIsValid then
begin
FMVCAuthenticationHandler.OnAuthorization(Context.LoggedUser.Roles,
AControllerQualifiedClassName, AActionName, LIsAuthorized)
end;
if LIsAuthorized then
Handled := False
else
begin
if LIsValid then
Send403Forbidden
else
SendWWWAuthenticate;
end;
end;
procedure TMVCBasicAuthenticationMiddleware.OnBeforeRouting
(Context: TWebContext; var Handled: Boolean);
begin
// do nothing
end;
end.