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{
$Id: header,v 1.1 2000/07/13 06:33:45 michael Exp $
This file is part of the Free Component Library (FCL)
Copyright (c) 1999-2000 by the Free Pascal development team
See the file COPYING.FPC, included in this distribution,
for details about the copyright.
This program 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.
**********************************************************************}
unit websession;
{$mode objfpc}{$H+}
{ $define cgidebug}
interface
uses
Classes, SysUtils, fphttp, inifiles, httpdefs;
Type
{ TSessionHTTPModule }
TSessionHTTPModule = Class(TCustomHTTPModule)
Private
FCreateSession : Boolean;
FOnNewSession: TNotifyEvent;
FOnSessionExpired: TNotifyEvent;
FSession: TCustomSession;
function GetSession: TCustomSession;
procedure SetSession(const AValue: TCustomSession);
Protected
Procedure CheckSession(ARequest : TRequest);
Procedure InitSession(AResponse : TResponse);
Procedure UpdateSession(AResponse : TResponse);
Procedure DoneSession; virtual;
Public
destructor destroy; override;
Procedure Notification(AComponent : TComponent;Operation : TOperation); override;
Procedure Loaded; Override;
Property CreateSession : Boolean Read FCreateSession Write FCreateSession;
Property Session : TCustomSession Read GetSession Write SetSession;
Property OnNewSession : TNotifyEvent Read FOnNewSession Write FOnNewSession;
Property OnSessionExpired : TNotifyEvent Read FOnSessionExpired Write FOnSessionExpired;
end;
{ TIniWebSession }
TIniWebSession = Class(TCustomSession)
Private
FSessionStarted : Boolean;
FCached: Boolean;
FIniFile : TMemInifile;
FSessionCookie: String;
FSessionCookiePath: String;
FSessionDir: String;
FTerminated :Boolean;
SID : String;
private
procedure FreeIniFile;
function GetSessionDir: String;
Protected
Procedure CheckSession;
Function GetSessionID : String; override;
Function GetSessionVariable(VarName : String) : String; override;
procedure SetSessionVariable(VarName : String; const AValue: String); override;
Property Cached : Boolean Read FCached Write FCached;
property SessionCookie : String Read FSessionCookie Write FSessionCookie;
Property SessionDir : String Read GetSessionDir Write FSessionDir;
Property SessionCookiePath : String Read FSessionCookiePath write FSessionCookiePath;
Public
Destructor Destroy; override;
Procedure Terminate; override;
Procedure UpdateResponse(AResponse : TResponse); override;
Procedure InitSession(ARequest : TRequest; OnNewSession, OnExpired: TNotifyEvent); override;
Procedure InitResponse(AResponse : TResponse); override;
Procedure RemoveVariable(VariableName : String); override;
end;
TFPWebSession = Class(TIniWebSession)
Public
Property Cached;
property SessionCookie;
Property SessionCookiePath;
Property SessionDir;
end;
EWebSessionError = Class(HTTPError);
TGetSessionEvent = Procedure(Var ASession : TCustomSession) of object;
Var
GlobalSessionDir : String;
OnGetDefaultSession : TGetSessionEvent;
Function GetDefaultSession : TCustomSession;
implementation
{$ifdef cgidebug}
uses dbugintf;
{$endif}
Const
// Sections in ini file
SSession = 'Session';
SData = 'Data';
KeyStart = 'Start'; // Start time of session
KeyLast = 'Last'; // Last seen time of session
KeyTimeOut = 'Timeout'; // Timeout in seconds;
SFPWebSession = 'FPWebSession'; // Cookie name for session.
resourcestring
SErrSessionTerminated = 'No web session active: Session was terminated';
SErrNoSession = 'No web session active: Session was not started';
Function GetDefaultSession : TCustomSession;
begin
{$ifdef cgidebug}SendMethodEnter('GetDefaultSession');{$endif}
Result:=Nil;
If (GlobalSessionDir='') then
GlobalSessionDir:=IncludeTrailingPathDelimiter(GetTempDir(True))
else
GlobalSessionDir:=IncludeTrailingPathDelimiter(GlobalSessionDir);
{$ifdef cgidebug}SendDebug('GetDefaultSession, session dir: '+GlobalSessionDir);{$endif}
If Assigned(OnGetDefaultSession) then
OnGetDefaultSession(Result);
if (Result=Nil) then
begin
{$ifdef cgidebug}Senddebug('Creating iniwebsession');{$endif}
Result:=TFPWebSession.Create(Nil);
end;
{$ifdef cgidebug}SendMethodExit('GetDefaultSession');{$endif}
end;
{ TIniWebSession }
function TIniWebSession.GetSessionID: String;
begin
If (SID='') then
SID:=inherited GetSessionID;
Result:=SID;
end;
procedure TIniWebSession.FreeIniFile;
begin
If Cached and Assigned(FIniFile) then
TMemIniFile(FIniFile).UpdateFile;
FreeAndNil(FIniFile);
end;
function TIniWebSession.GetSessionDir: String;
begin
Result:=FSessionDir;
If (Result='') then
Result:=GlobalSessionDir;
end;
Procedure TIniWebSession.CheckSession;
begin
If Not Assigned(FInifile) then
if FTerminated then
Raise EWebSessionError.Create(SErrSessionTerminated)
else
Raise EWebSessionError.Create(SErrNoSession)
end;
function TIniWebSession.GetSessionVariable(VarName: String): String;
begin
CheckSession;
Result:=FIniFile.ReadString(SData,VarName,'');
end;
procedure TIniWebSession.SetSessionVariable(VarName: String;
const AValue: String);
begin
CheckSession;
FIniFile.WriteString(SData,VarName,AValue);
If Not Cached then
TMemIniFile(FIniFile).UpdateFile;
end;
destructor TIniWebSession.Destroy;
begin
// In case an exception occured and UpdateResponse is not called,
// write the updates to disk and free FIniFile
FreeIniFile;
inherited Destroy;
end;
procedure TIniWebSession.Terminate;
begin
FTerminated:=True;
If Assigned(FIniFile) Then
begin
DeleteFile(Finifile.FileName);
FreeAndNil(FIniFile);
end;
end;
procedure TIniWebSession.UpdateResponse(AResponse: TResponse);
begin
// Do nothing. Init has done the job.
FreeIniFile;
end;
procedure TIniWebSession.InitSession(ARequest: TRequest; OnNewSession,OnExpired: TNotifyEvent);
Var
L,D : TDateTime;
T : Integer;
S : String;
begin
{$ifdef cgidebug}SendMethodEnter('TIniWebSession.InitSession');{$endif}
// First initialize all session-dependent properties to their default, because
// in Apache-modules or fcgi programs the session-instance is re-used
SID := '';
FSessionStarted := False;
FTerminated := False;
// If a exception occured during a prior request FIniFile is still not freed
if assigned(FIniFile) then FreeIniFile;
If (SessionCookie='') then
SessionCookie:=SFPWebSession;
S:=ARequest.CookieFields.Values[SessionCookie];
// have session cookie ?
If (S<>'') then
begin
{$ifdef cgidebug}SendDebug('Reading ini file:'+S);{$endif}
FiniFile:=TMemIniFile.Create(IncludeTrailingPathDelimiter(SessionDir)+S);
L:=Finifile.ReadDateTime(SSession,KeyLast,0);
{$ifdef cgidebug}
If (L=0) then
SendDebug('No datetime in inifile (or not valid datetime : '+Finifile.ReadString(SSession,KeyLast,''));
{$endif}
T:=FIniFile.ReadInteger(SSession,KeyTimeOut,Self.TimeOutMinutes);
{$ifdef cgidebug}SendDebug('Timeout :'+IntToStr(t));{$endif}
{$ifdef cgidebug}SendDebug('Last :'+FormatDateTime('yyyy/mm/dd hh:nn:ss.zzz',L));{$endif}
If ((Now-L)>(T/(24*60))) then
begin
{$ifdef cgidebug}SendDebug('Timeout :'+FloatToStr(T/(24*60)));{$endif}
{$ifdef cgidebug}SendDebug('Timeout :'+FormatDateTime('hh:nn:ss.zzz',(T/(24*60))));{$endif}
{$ifdef cgidebug}SendDebug('Diff :'+FormatDateTime('hh:nn:ss.zzz',Now-L));{$endif}
{$ifdef cgidebug}SendDebug('Ini file session expired: '+S);{$endif}
// Expire session.
If Assigned(OnExpired) then
OnExpired(Self);
DeleteFile(FIniFIle.FileName);
FreeAndNil(FInifile);
S:='';
end
else
SID:=S;
end;
If (S='') then
begin
If Assigned(OnNewSession) then
OnNewSession(Self);
GetSessionID;
S:=IncludeTrailingPathDelimiter(SessionDir)+SessionID;
{$ifdef cgidebug}SendDebug('Creating new Ini file : '+S);{$endif}
FIniFile:=TMemIniFile.Create(S);
FIniFile.WriteDateTime(SSession,KeyStart,Now);
FIniFile.WriteInteger(SSession,KeyTimeOut,Self.TimeOutMinutes);
FSessionStarted:=True;
end;
FIniFile.WriteDateTime(SSession,KeyLast,Now);
If not FCached then
FIniFile.UpdateFile;
{$ifdef cgidebug}SendMethodExit('TIniWebSession.InitSession');{$endif}
end;
procedure TIniWebSession.InitResponse(AResponse: TResponse);
Var
C : TCookie;
begin
{$ifdef cgidebug}SendMethodEnter('TIniWebSession.InitResponse');{$endif}
If FSessionStarted then
begin
{$ifdef cgidebug}SendDebug('Session started');{$endif}
C:=AResponse.Cookies.FindCookie(SessionCookie);
If (C=Nil) then
begin
C:=AResponse.Cookies.Add;
C.Name:=SessionCookie;
end;
C.Value:=SID;
C.Path:=FSessionCookiePath;
end
else If FTerminated then
begin
{$ifdef cgidebug}SendDebug('Session terminated');{$endif}
C:=AResponse.Cookies.Add;
C.Name:=SessionCookie;
C.Value:='';
end;
{$ifdef cgidebug}SendMethodExit('TIniWebSession.InitResponse');{$endif}
end;
procedure TIniWebSession.RemoveVariable(VariableName: String);
begin
{$ifdef cgidebug}SendMethodEnter('TIniWebSession.RemoveVariable');{$endif}
CheckSession;
FIniFile.DeleteKey(SData,VariableName);
If Not Cached then
TMemIniFile(FIniFile).UpdateFile;
{$ifdef cgidebug}SendMethodExit('TIniWebSession.RemoveVariable');{$endif}
end;
function TSessionHTTPModule.GetSession: TCustomSession;
begin
{$ifdef cgidebug}SendMethodEnter('SessionHTTPModule.GetSession');{$endif}
If (csDesigning in ComponentState) then
begin
{$ifdef cgidebug}SendDebug('Sending session');{$endif}
Result:=FSession
end
else
begin
If (FSession=Nil) then
begin
{$ifdef cgidebug}SendDebug('Getting default session');{$endif}
FSession:=GetDefaultSession;
end;
Result:=FSession
end;
{$ifdef cgidebug}SendMethodExit('SessionHTTPModule.GetSession');{$endif}
end;
procedure TSessionHTTPModule.SetSession(const AValue: TCustomSession);
begin
if FSession<>AValue then
begin
If Assigned(FSession) then
FSession.RemoveFreeNotification(Self);
FSession:=AValue;
If Assigned(FSession) then
FSession.FreeNotification(Self);
end;
end;
procedure TSessionHTTPModule.CheckSession(ARequest : TRequest);
begin
{$ifdef cgidebug}SendMethodEnter('SessionHTTPModule('+Name+').CheckSession');{$endif}
If CreateSession then
begin
If (FSession=Nil) then
FSession:=GetDefaultSession;
if Assigned(FSession) then
FSession.InitSession(ARequest,FOnNewSession,FOnSessionExpired);
end;
{$ifdef cgidebug}SendMethodExit('SessionHTTPModule('+Name+').CheckSession');{$endif}
end;
procedure TSessionHTTPModule.InitSession(AResponse: TResponse);
begin
{$ifdef cgidebug}SendMethodEnter('SessionHTTPModule('+Name+').InitSession');{$endif}
If CreateSession and Assigned(FSession) then
FSession.InitResponse(AResponse);
{$ifdef cgidebug}SendMethodExit('SessionHTTPModule('+Name+').InitSession');{$endif}
end;
procedure TSessionHTTPModule.UpdateSession(AResponse: TResponse);
begin
If CreateSession And Assigned(FSession) then
FSession.UpdateResponse(AResponse);
end;
procedure TSessionHTTPModule.DoneSession;
begin
FreeAndNil(FSession);
end;
destructor TSessionHTTPModule.destroy;
begin
// Prevent memory leaks.
If Assigned(FSession) then
DoneSession;
inherited destroy;
end;
procedure TSessionHTTPModule.Notification(AComponent: TComponent;
Operation: TOperation);
begin
{$ifdef cgidebug}SendMethodEnter('SessionHTTPModule('+Name+').Notification');{$endif}
inherited Notification(AComponent, Operation);
If (Operation=opRemove) then
if (AComponent=FSession) Then
FSession:=Nil;
{$ifdef cgidebug}SendMethodExit('SessionHTTPModule('+Name+').Notification');{$endif}
end;
procedure TSessionHTTPModule.Loaded;
begin
{$ifdef cgidebug}SendMethodEnter('SessionHTTPModule.Loaded');{$endif}
inherited Loaded;
If CreateSession And (FSession=Nil) then
FSession:=GetDefaultSession;
{$ifdef cgidebug}SendMethodExit('SessionHTTPModule.Loaded');{$endif}
end;
end.
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