mirror of
https://github.com/danieleteti/delphimvcframework.git
synced 2024-11-15 15:55:54 +01:00
228 lines
6.9 KiB
ObjectPascal
228 lines
6.9 KiB
ObjectPascal
{ *************************************************************************** }
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{ }
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{ Delphi MVC Framework }
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{ }
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{ Copyright (c) 2010-2015 Daniele Teti and the DMVCFramework Team }
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{ }
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{ https://github.com/danieleteti/delphimvcframework }
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{ }
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{ *************************************************************************** }
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{ }
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{ Licensed under the Apache License, Version 2.0 (the "License"); }
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{ you may not use this file except in compliance with the License. }
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{ You may obtain a copy of the License at }
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{ }
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{ http://www.apache.org/licenses/LICENSE-2.0 }
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{ }
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{ Unless required by applicable law or agreed to in writing, software }
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{ distributed under the License is distributed on an "AS IS" BASIS, }
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{ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. }
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{ See the License for the specific language governing permissions and }
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{ limitations under the License. }
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{ }
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{ *************************************************************************** }
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unit MVCFramework.Middleware.Authentication;
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interface
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uses
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MVCFramework, MVCFramework.Commons, MVCFramework.Logger,
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System.Generics.Collections;
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type
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TMVCBasicAuthenticationMiddleware = class(TInterfacedObject, IMVCMiddleware)
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strict private
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FMVCAuthenticationHandler: IMVCAuthenticationHandler;
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protected
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FRealm: string;
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procedure OnBeforeRouting(Context: TWebContext; var Handled: Boolean);
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procedure OnAfterControllerAction(Context: TWebContext;
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const AActionName: string; const Handled: Boolean);
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procedure OnBeforeControllerAction(Context: TWebContext;
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const AControllerQualifiedClassName: string; const AActionName: string;
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var Handled: Boolean);
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public
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constructor Create(AMVCAuthenticationHandler: IMVCAuthenticationHandler;
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Realm: string = 'DelphiMVCFramework REALM'); virtual;
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end;
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implementation
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uses
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System.SysUtils, MVCFramework.Session
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{$IF CompilerVersion >= 21}
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, System.NetEncoding
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{$ELSE}
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, Soap.EncdDecd
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{$ENDIF};
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{
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401 Unauthorized response should be used for missing or bad authentication, and a
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403 Forbidden response should be used afterwards, when the user is authenticated
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but isn<73>t authorized to perform the requested operation on the given resource.
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}
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const
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CONTENT_HTML_FORMAT = '<html><body><h1>%s</h1><p>%s</p></body></html>';
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CONTENT_401_NOT_AUTHORIZED = '401: Not authorized';
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CONTENT_403_FORBIDDEN = '403: Forbidden';
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function Base64DecodeString(const Value: String): String; inline;
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begin
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{$IF CompilerVersion >= 21}
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Result := TNetEncoding.Base64.Decode(Value);
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{$ELSE}
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Result := DecodeString(Value);
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{$ENDIF}
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end;
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{ TMVCSalutationMiddleware }
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constructor TMVCBasicAuthenticationMiddleware.Create(AMVCAuthenticationHandler
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: IMVCAuthenticationHandler; Realm: string);
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begin
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inherited Create;
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FMVCAuthenticationHandler := AMVCAuthenticationHandler;
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FRealm := Realm;
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end;
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procedure TMVCBasicAuthenticationMiddleware.OnAfterControllerAction
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(Context: TWebContext; const AActionName: string; const Handled: Boolean);
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begin
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// do nothing
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end;
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procedure TMVCBasicAuthenticationMiddleware.OnBeforeControllerAction
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(Context: TWebContext; const AControllerQualifiedClassName,
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AActionName: string; var Handled: Boolean);
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var
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LAuth: string;
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LPieces: TArray<string>;
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LRoles: TList<string>;
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LIsValid: Boolean;
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LIsAuthorized: Boolean;
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LAuthRequired: Boolean;
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LSessionData: TSessionData;
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LPair: TPair<String, String>;
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procedure SendWWWAuthenticate;
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begin
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Context.LoggedUser.Clear;
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if Context.Request.ClientPreferHTML then
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begin
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Context.Response.ContentType := 'text/html';
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Context.Response.RawWebResponse.Content :=
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Format(CONTENT_HTML_FORMAT, [CONTENT_401_NOT_AUTHORIZED, Context.Config[TMVCConfigKey.ServerName]]);
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end
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else
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begin
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Context.Response.ContentType := 'text/plain';
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Context.Response.RawWebResponse.Content := CONTENT_401_NOT_AUTHORIZED + sLineBreak + Context.Config[TMVCConfigKey.ServerName];
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end;
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Context.Response.StatusCode := 401;
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Context.Response.SetCustomHeader('WWW-Authenticate',
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'Basic realm=' + QuotedStr(FRealm));
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Handled := true;
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end;
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procedure Send403Forbidden;
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begin
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Context.LoggedUser.Clear;
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if Context.Request.ClientPreferHTML then
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begin
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Context.Response.ContentType := 'text/html';
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Context.Response.RawWebResponse.Content :=
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Format(CONTENT_HTML_FORMAT, [CONTENT_403_FORBIDDEN, Context.Config[TMVCConfigKey.ServerName]]);
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end
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else
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begin
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Context.Response.ContentType := 'text/plain';
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Context.Response.RawWebResponse.Content := CONTENT_403_FORBIDDEN + sLineBreak + Context.Config[TMVCConfigKey.ServerName];
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end;
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Context.Response.StatusCode := 403;
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Handled := true;
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end;
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begin
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// check if the resource is protected
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FMVCAuthenticationHandler.OnRequest(AControllerQualifiedClassName,
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AActionName, LAuthRequired);
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if not LAuthRequired then
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begin
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Handled := False;
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Exit;
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end;
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Context.LoggedUser.LoadFromSession(Context.Session);
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if not Context.LoggedUser.IsValid then
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begin
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// We NEED authentication
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LAuth := Context.Request.Headers['Authorization'];
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LAuth := Base64DecodeString(LAuth.Remove(0, 'Basic'.Length).Trim);
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LPieces := LAuth.Split([':']);
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if LAuth.IsEmpty or (Length(LPieces) <> 2) then
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begin
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SendWWWAuthenticate;
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Exit;
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end;
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// now, we have username and password.
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// check the authorization for the requested resource
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LRoles := TList<string>.Create;
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try
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LSessionData := TSessionData.Create;
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try
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FMVCAuthenticationHandler.OnAuthentication(LPieces[0], LPieces[1],
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LRoles, LIsValid, LSessionData);
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if LIsValid then
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begin
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Context.LoggedUser.Roles.AddRange(LRoles);
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Context.LoggedUser.UserName := LPieces[0];
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Context.LoggedUser.LoggedSince := Now;
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Context.LoggedUser.Realm := FRealm;
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Context.LoggedUser.SaveToSession(Context.Session);
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// save sessiondata to the actual session
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for LPair in LSessionData do
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begin
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Context.Session[LPair.Key] := LPair.Value;
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end;
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end;
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finally
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LSessionData.Free;
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end;
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finally
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LRoles.Free;
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end;
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end;
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// authorization
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LIsAuthorized := False;
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if LIsValid then
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begin
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FMVCAuthenticationHandler.OnAuthorization(Context.LoggedUser.Roles,
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AControllerQualifiedClassName, AActionName, LIsAuthorized)
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end;
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if LIsAuthorized then
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Handled := False
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else
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begin
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if LIsValid then
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Send403Forbidden
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else
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SendWWWAuthenticate;
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end;
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end;
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procedure TMVCBasicAuthenticationMiddleware.OnBeforeRouting
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(Context: TWebContext; var Handled: Boolean);
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begin
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// do nothing
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end;
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end.
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