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Automated support to avoid "mid-air collisions". New methods SetETag and CheckIfMatch allows a better security without adding complexity to the controller code - check avoid_mid_air_collisions_sample.dproj sample and see https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/ETag#avoiding_mid-air_collisions for more info about mid-air collisions.

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This commit is contained in:
Daniele Teti 2022-08-18 01:45:49 +02:00
parent 3998c1288b
commit 0f3bae84b9
14 changed files with 1525 additions and 157 deletions
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5
README.md
View File

@ -682,6 +682,11 @@ The current beta release is named 3.2.2-nitrogen. If you want to stay on the-edg
//If the cookie doesn't exist (or cannot be deserialized) an exception is raised.
end;
```
- ✅ Improved! While not strictly required nor defined, DMVCFramework supports sending body data for all HTTP VERBS - see https://developer.mozilla.org/en-US/docs/Web/HTTP/Methods/GET
- ⚡ New! Automated support to avoid "mid-air collisions". New methods `SetETag` and `CheckIfMatch` allows a better security without adding complexity to the controller code - check `avoid_mid_air_collisions_sample.dproj` sample and see https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/ETag#avoiding_mid-air_collisions for more info about mid-air collisions.
### Bug Fixes in 3.2.2-nitrogen

5
ideexpert/DMVC.Expert.CodeGen.Templates.pas
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@ -89,7 +89,7 @@ resourcestring
// ' WriteLn(''Write "quit" or "exit" to shutdown the server'');' + sLineBreak +
' LServer.Active := True;' + sLineBreak +
' WriteLn(''Listening on port '', APort);' + sLineBreak +
' WriteLn(''CTRL+C to shutdown the server'');' + sLineBreak +
' Write(''CTRL+C to shutdown the server'');' + sLineBreak +
' WaitForTerminationSignal; ' + sLineBreak +
' EnterInShutdownState; ' + sLineBreak +
' LServer.Active := False; ' + sLineBreak +
@ -126,7 +126,6 @@ resourcestring
' MVCFramework, MVCFramework.Commons, MVCFramework.Serializer.Commons;' + sLineBreak +
sLineBreak +
'type' + sLineBreak +
sLineBreak +
' [MVCPath(''/api'')]' + sLineBreak +
' %1:s = class(TMVCController) ' + sLineBreak +
' public' + sLineBreak +
@ -195,7 +194,7 @@ resourcestring
'begin' + sLineBreak +
' //todo: render the customer by id' + sLineBreak +
'end;' + sLineBreak + sLineBreak +
'procedure %0:s.CreateCustomer;' + sLineBreak + sLineBreak +
'procedure %0:s.CreateCustomer;' + sLineBreak +
'begin' + sLineBreak +
' //todo: create a new customer' + sLineBreak +
'end;' + sLineBreak + sLineBreak +

65
ideexpert/DMVC.Expert.Forms.NewProjectWizard.dfm
View File

@ -4,7 +4,7 @@ object frmDMVCNewProject: TfrmDMVCNewProject
BorderStyle = bsDialog
Caption = 'DelphiMVCFramework :: New Project Wizard'
ClientHeight = 518
ClientWidth = 676
ClientWidth = 700
Color = clBtnFace
Constraints.MinHeight = 145
Constraints.MinWidth = 250
@ -16,13 +16,13 @@ object frmDMVCNewProject: TfrmDMVCNewProject
Position = poMainFormCenter
OnCreate = FormCreate
DesignSize = (
676
700
518)
TextHeight = 13
object Shape1: TShape
Left = 0
Top = 0
Width = 676
Width = 700
Height = 121
Align = alTop
Pen.Color = clWhite
@ -398,7 +398,7 @@ object frmDMVCNewProject: TfrmDMVCNewProject
end
object lblBook: TLabel
AlignWithMargins = True
Left = 8
Left = 13
Top = 487
Width = 259
Height = 16
@ -418,9 +418,10 @@ object frmDMVCNewProject: TfrmDMVCNewProject
OnClick = lblBookClick
OnMouseEnter = lblBookMouseEnter
OnMouseLeave = lblBookMouseLeave
ExplicitLeft = 8
end
object btnOK: TButton
Left = 508
Left = 532
Top = 483
Width = 77
Height = 27
@ -430,9 +431,10 @@ object frmDMVCNewProject: TfrmDMVCNewProject
ModalResult = 1
TabOrder = 3
OnClick = btnOKClick
ExplicitLeft = 508
end
object btnCancel: TButton
Left = 591
Left = 615
Top = 483
Width = 77
Height = 27
@ -441,6 +443,7 @@ object frmDMVCNewProject: TfrmDMVCNewProject
Caption = 'Cancel'
ModalResult = 2
TabOrder = 4
ExplicitLeft = 591
end
object chkAddToProjectGroup: TCheckBox
Left = 24
@ -565,12 +568,12 @@ object frmDMVCNewProject: TfrmDMVCNewProject
object GroupBox1: TGroupBox
Left = 287
Top = 135
Width = 381
Width = 405
Height = 214
Caption = 'Middlewares'
TabOrder = 6
DesignSize = (
381
405
214)
object Label4: TLabel
Left = 161
@ -582,7 +585,7 @@ object frmDMVCNewProject: TfrmDMVCNewProject
object Bevel1: TBevel
Left = 11
Top = 102
Width = 358
Width = 383
Height = 3
Shape = bsTopLine
end
@ -594,43 +597,47 @@ object frmDMVCNewProject: TfrmDMVCNewProject
Caption = 'ConnectionDef Name'
end
object chkAnalyticsMiddleware: TCheckBox
Left = 21
Left = 27
Top = 50
Width = 135
Height = 17
Anchors = [akTop]
Caption = 'Analytics'
TabOrder = 0
ExplicitLeft = 21
end
object chkCompression: TCheckBox
Left = 21
Left = 27
Top = 24
Width = 153
Height = 17
Anchors = [akTop]
Caption = 'Compression'
TabOrder = 1
ExplicitLeft = 21
end
object chkStaticFiles: TCheckBox
Left = 21
Left = 27
Top = 76
Width = 135
Height = 17
Anchors = [akTop]
Caption = 'Static Files'
TabOrder = 2
ExplicitLeft = 21
end
object chkTrace: TCheckBox
Left = 215
Left = 192
Top = 50
Width = 135
Width = 150
Height = 17
Hint = 'Debug purposes'
Anchors = [akTop]
Caption = 'Tracing'
Caption = 'Tracing (debug purposes)'
TabOrder = 3
end
object chkCORS: TCheckBox
Left = 215
Left = 192
Top = 24
Width = 135
Height = 17
@ -639,27 +646,29 @@ object frmDMVCNewProject: TfrmDMVCNewProject
TabOrder = 4
end
object chkETAG: TCheckBox
Left = 215
Left = 192
Top = 76
Width = 135
Width = 202
Height = 17
Anchors = [akTop]
Caption = 'ETag'
Caption = 'ETag (Cache of unchanged resources)'
TabOrder = 5
ExplicitLeft = 175
end
object chkActiveRecord: TCheckBox
Left = 21
Left = 27
Top = 111
Width = 135
Height = 17
Anchors = [akTop]
Caption = 'ActiveRecord'
TabOrder = 6
ExplicitLeft = 21
end
object EdtFDConnDefFileName: TEdit
Left = 161
Top = 129
Width = 204
Width = 228
Height = 21
Anchors = [akLeft, akTop, akRight]
TabOrder = 7
@ -668,23 +677,25 @@ object frmDMVCNewProject: TfrmDMVCNewProject
object EdtConnDefName: TEdit
Left = 161
Top = 175
Width = 204
Width = 228
Height = 21
Anchors = [akLeft, akTop, akRight]
TabOrder = 8
TextHint = 'MyConnDef'
ExplicitWidth = 204
end
end
object GroupBoxJSONRPC: TGroupBox
Left = 287
Top = 360
Width = 381
Width = 405
Height = 105
Anchors = [akLeft, akTop, akRight]
Caption = 'JSON-RPC 2.0'
TabOrder = 7
ExplicitWidth = 381
DesignSize = (
381
405
105)
object Label3: TLabel
Left = 16
@ -696,22 +707,24 @@ object frmDMVCNewProject: TfrmDMVCNewProject
object EdtJSONRPCClassName: TEdit
Left = 16
Top = 72
Width = 350
Width = 374
Height = 21
Anchors = [akLeft, akTop, akRight]
TabOrder = 0
TextHint = 'TMyJSONRPCObject'
ExplicitWidth = 350
end
object chkJSONRPC: TCheckBox
Left = 16
Top = 22
Width = 343
Width = 367
Height = 17
Anchors = [akLeft, akTop, akRight]
Caption = 'Create JSONRPC 2.0 end-point'
Checked = True
State = cbChecked
TabOrder = 1
ExplicitWidth = 343
end
end
object ApplicationEvents: TApplicationEvents

167
samples/avoid_mid_air_collisions_sample/MainControllerU.pas Normal file
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@ -0,0 +1,167 @@
unit MainControllerU;
interface
uses
MVCFramework, MVCFramework.Commons, MVCFramework.Serializer.Commons;
type
[MVCNameCase(ncCamelCase)]
TPerson = class
private
fName: String;
fSurname: String;
fID: Integer;
public
function GetHash: String;
class function GetNew(const id: Integer; const Name, Surname: String): TPerson;
property ID: Integer read fID write fID;
property Name: String read fName write fName;
property Surname: String read fSurname write fSurname;
end;
[MVCPath('/api/people')]
TMyController = class(TMVCController)
private
function GetPersonByID(const ID: Integer): TPerson;
procedure UpdatePersonByID(const ID: Integer; const Person: TPerson);
public
[MVCPath]
[MVCHTTPMethod([httpGET])]
procedure Index;
public
// Sample CRUD Actions for a "person" entity
[MVCPath('/($id)')]
[MVCHTTPMethod([httpGET])]
procedure Getperson(id: Integer);
[MVCPath]
[MVCHTTPMethod([httpPOST])]
procedure Createperson([MVCFromBody] const Person: TPerson);
[MVCPath('/($id)')]
[MVCHTTPMethod([httpPUT])]
procedure UpdatePerson(id: Integer; [MVCFromBody] const Person: TPerson);
[MVCPath('/($id)')]
[MVCHTTPMethod([httpDELETE])]
procedure DeletePerson(id: Integer);
end;
implementation
uses
System.SysUtils, MVCFramework.Logger, System.StrUtils, MVCFramework.Cache,
System.Rtti, MVCFramework.Rtti.Utils;
procedure TMyController.Index;
begin
// use Context property to access to the HTTP request and response
Render('Hello DelphiMVCFramework World');
end;
function TMyController.GetPersonByID(const ID: Integer): TPerson;
var
lPerson: TPerson;
begin
lPerson := nil;
if not TMVCCacheSingleton.Instance.ExecOnItemWithWriteLock(id.ToString,
procedure(Value: TValue)
begin
lPerson := TRttiUtils.Clone(Value.AsObject) as TPerson;
end) then
begin
raise EMVCException.Create(HTTP_STATUS.NotFound, 'Person not found');
end;
Result := lPerson;
end;
procedure TMyController.Getperson(id: Integer);
var
lItem: TMVCCacheItem;
lPerson: TPerson;
begin
lPerson := GetPersonByID(id);
SetETag(lPerson.GetHash);
Render(lPerson, True);
end;
procedure TMyController.Createperson([MVCFromBody] const Person: TPerson);
var
lValue: TValue;
begin
TMVCCacheSingleton.Instance.BeginWrite;
try
if not TMVCCacheSingleton.Instance.Contains(Person.ID.ToString, lValue) then
begin
TMVCCacheSingleton.Instance.SetValue(Person.ID.ToString, TRttiUtils.Clone(Person));
end
else
begin
raise EMVCException.Create(HTTP_STATUS.NotAcceptable, 'Duplicate ID for person');
end;
finally
TMVCCacheSingleton.Instance.EndWrite;
end;
Render201Created();
end;
procedure TMyController.UpdatePerson(id: Integer; [MVCFromBody] const Person: TPerson);
var
lItem: TMVCCacheItem;
lPerson: TPerson;
begin
// retrieve data from storage
lPerson := GetPersonByID(id);
//check if the client modified the current version (a.k.a. mid-air collisions)
//raises an exception if client send a wrong If-Match header value
CheckIfMatch(lPerson.GetHash);
//perform the actual update and save to the storage
lPerson.Name := Person.Name;
lPerson.Surname := Person.Surname;
UpdatePersonByID(lPerson.ID, lPerson);
//set the new ETag value base on the data status
SetETag(lPerson.GetHash);
//reply with a 200 OK
Render(HTTP_STATUS.OK);
end;
procedure TMyController.UpdatePersonByID(const ID: Integer;
const Person: TPerson);
begin
TMVCCacheSingleton.Instance.SetValue(ID.ToString, Person);
end;
procedure TMyController.DeletePerson(id: Integer);
var
lPerson: TPerson;
begin
lPerson := GetPersonByID(ID);
CheckIfMatch(lPerson.GetHash);
TMVCCacheSingleton.Instance.RemoveItem(ID.ToString);
Render204NoContent();
end;
{ TPerson }
function TPerson.GetHash: String;
begin
Result := Format('%d|%s|%s', [fID, fName, fSurname]);
end;
class function TPerson.GetNew(const id: Integer; const Name, Surname: String): TPerson;
begin
Result := TPerson.Create;
Result.fID := id;
Result.fName := Name;
Result.fSurname := Surname;
end;
end.

7
samples/avoid_mid_air_collisions_sample/WebModuleU.dfm Normal file
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@ -0,0 +1,7 @@
object MyWebModule: TMyWebModule
OnCreate = WebModuleCreate
OnDestroy = WebModuleDestroy
Actions = <>
Height = 230
Width = 415
end

102
samples/avoid_mid_air_collisions_sample/WebModuleU.pas Normal file
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@ -0,0 +1,102 @@
unit WebModuleU;
interface
uses
System.SysUtils,
System.Classes,
Web.HTTPApp,
MVCFramework;
type
TMyWebModule = class(TWebModule)
procedure WebModuleCreate(Sender: TObject);
procedure WebModuleDestroy(Sender: TObject);
private
FMVC: TMVCEngine;
public
{ Public declarations }
end;
var
WebModuleClass: TComponentClass = TMyWebModule;
implementation
{$R *.dfm}
uses
MainControllerU,
System.IOUtils,
MVCFramework.Commons,
MVCFramework.Middleware.ActiveRecord,
MVCFramework.Middleware.StaticFiles,
MVCFramework.Middleware.Analytics,
MVCFramework.Middleware.Trace,
MVCFramework.Middleware.CORS,
MVCFramework.Middleware.ETag,
MVCFramework.Middleware.Compression;
procedure TMyWebModule.WebModuleCreate(Sender: TObject);
begin
FMVC := TMVCEngine.Create(Self,
procedure(Config: TMVCConfig)
begin
// session timeout (0 means session cookie)
Config[TMVCConfigKey.SessionTimeout] := '0';
//default content-type
Config[TMVCConfigKey.DefaultContentType] := TMVCConstants.DEFAULT_CONTENT_TYPE;
//default content charset
Config[TMVCConfigKey.DefaultContentCharset] := TMVCConstants.DEFAULT_CONTENT_CHARSET;
//unhandled actions are permitted?
Config[TMVCConfigKey.AllowUnhandledAction] := 'false';
//enables or not system controllers loading (available only from localhost requests)
Config[TMVCConfigKey.LoadSystemControllers] := 'true';
//default view file extension
Config[TMVCConfigKey.DefaultViewFileExtension] := 'html';
//view path
Config[TMVCConfigKey.ViewPath] := 'templates';
//Max Record Count for automatic Entities CRUD
Config[TMVCConfigKey.MaxEntitiesRecordCount] := '20';
//Enable Server Signature in response
Config[TMVCConfigKey.ExposeServerSignature] := 'true';
//Enable X-Powered-By Header in response
Config[TMVCConfigKey.ExposeXPoweredBy] := 'true';
// Max request size in bytes
Config[TMVCConfigKey.MaxRequestSize] := IntToStr(TMVCConstants.DEFAULT_MAX_REQUEST_SIZE);
end);
FMVC.AddController(TMyController);
// Analytics middleware generates a csv log, useful to do trafic analysis
//FMVC.AddMiddleware(TMVCAnalyticsMiddleware.Create(GetAnalyticsDefaultLogger));
// The folder mapped as documentroot for TMVCStaticFilesMiddleware must exists!
//FMVC.AddMiddleware(TMVCStaticFilesMiddleware.Create('/static', TPath.Combine(ExtractFilePath(GetModuleName(HInstance)), 'www')));
// Trace middlewares produces a much detailed log for debug purposes
FMVC.AddMiddleware(TMVCTraceMiddleware.Create);
// CORS middleware handles... well, CORS
//FMVC.AddMiddleware(TMVCCORSMiddleware.Create);
// Simplifies TMVCActiveRecord connection definition
//FMVC.AddMiddleware(TMVCActiveRecordMiddleware.Create('MyConnDef','FDConnectionDefs.ini'));
// Compression middleware must be the last in the chain, just before the ETag, if present.
//FMVC.AddMiddleware(TMVCCompressionMiddleware.Create);
// ETag middleware must be the latest in the chain
//FMVC.AddMiddleware(TMVCETagMiddleware.Create);
end;
procedure TMyWebModule.WebModuleDestroy(Sender: TObject);
begin
FMVC.Free;
end;
end.

76
samples/avoid_mid_air_collisions_sample/avoid_mid_air_collisions_sample.dpr Normal file
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@ -0,0 +1,76 @@
program avoid_mid_air_collisions_sample;
{$APPTYPE CONSOLE}
uses
System.SysUtils,
MVCFramework,
MVCFramework.Logger,
MVCFramework.Commons,
MVCFramework.Signal,
MVCFramework.Cache,
Web.ReqMulti,
Web.WebReq,
Web.WebBroker,
IdContext,
IdHTTPWebBrokerBridge,
MainControllerU in 'MainControllerU.pas',
WebModuleU in 'WebModuleU.pas' {MyWebModule: TWebModule},
MVCFramework.Utils in '..\..\sources\MVCFramework.Utils.pas';
{$R *.res}
procedure RunServer(APort: Integer);
var
LServer: TIdHTTPWebBrokerBridge;
begin
Writeln('** DMVCFramework Server ** build ' + DMVCFRAMEWORK_VERSION);
LServer := TIdHTTPWebBrokerBridge.Create(nil);
try
LServer.OnParseAuthentication := TMVCParseAuthentication.OnParseAuthentication;
LServer.DefaultPort := APort;
LServer.KeepAlive := True;
{ more info about MaxConnections
http://ww2.indyproject.org/docsite/html/frames.html?frmname=topic&frmfile=index.html }
LServer.MaxConnections := 0;
{ more info about ListenQueue
http://ww2.indyproject.org/docsite/html/frames.html?frmname=topic&frmfile=index.html }
LServer.ListenQueue := 200;
LServer.Active := True;
WriteLn('Listening on port ', APort);
WriteLn('CTRL+C to shutdown the server');
WaitForTerminationSignal;
EnterInShutdownState;
LServer.Active := False;
finally
LServer.Free;
end;
end;
procedure LoadFakeData;
begin
TMVCCacheSingleton.Instance.SetValue('1', TPerson.GetNew(1, 'Daniele','Teti'));
TMVCCacheSingleton.Instance.SetValue('2', TPerson.GetNew(2, 'Peter','Parker'));
TMVCCacheSingleton.Instance.SetValue('3', TPerson.GetNew(3, 'Bruce','Banner'));
TMVCCacheSingleton.Instance.SetValue('4', TPerson.GetNew(4, 'Sue','Storm'));
end;
begin
ReportMemoryLeaksOnShutdown := True;
IsMultiThread := True;
try
if WebRequestHandler <> nil then
WebRequestHandler.WebModuleClass := WebModuleClass;
WebRequestHandlerProc.MaxConnections := 1024;
LoadFakeData;
RunServer(8080);
except
on E: Exception do
Writeln(E.ClassName, ': ', E.Message);
end;
end.

907
samples/avoid_mid_air_collisions_sample/avoid_mid_air_collisions_sample.dproj Normal file
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@ -0,0 +1,907 @@
<Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
<PropertyGroup>
<ProjectGuid>{03D8066E-D767-4E59-8D05-7C3341BECDFC}</ProjectGuid>
<ProjectVersion>19.4</ProjectVersion>
<FrameworkType>None</FrameworkType>
<Base>True</Base>
<Config Condition="'$(Config)'==''">Debug</Config>
<Platform Condition="'$(Platform)'==''">Win32</Platform>
<TargetedPlatforms>1</TargetedPlatforms>
<AppType>Console</AppType>
<MainSource>avoid_mid_air_collisions_sample.dpr</MainSource>
</PropertyGroup>
<PropertyGroup Condition="'$(Config)'=='Base' or '$(Base)'!=''">
<Base>true</Base>
</PropertyGroup>
<PropertyGroup Condition="('$(Platform)'=='Android' and '$(Base)'=='true') or '$(Base_Android)'!=''">
<Base_Android>true</Base_Android>
<CfgParent>Base</CfgParent>
<Base>true</Base>
</PropertyGroup>
<PropertyGroup Condition="('$(Platform)'=='Android64' and '$(Base)'=='true') or '$(Base_Android64)'!=''">
<Base_Android64>true</Base_Android64>
<CfgParent>Base</CfgParent>
<Base>true</Base>
</PropertyGroup>
<PropertyGroup Condition="('$(Platform)'=='Linux64' and '$(Base)'=='true') or '$(Base_Linux64)'!=''">
<Base_Linux64>true</Base_Linux64>
<CfgParent>Base</CfgParent>
<Base>true</Base>
</PropertyGroup>
<PropertyGroup Condition="('$(Platform)'=='Win32' and '$(Base)'=='true') or '$(Base_Win32)'!=''">
<Base_Win32>true</Base_Win32>
<CfgParent>Base</CfgParent>
<Base>true</Base>
</PropertyGroup>
<PropertyGroup Condition="('$(Platform)'=='Win64' and '$(Base)'=='true') or '$(Base_Win64)'!=''">
<Base_Win64>true</Base_Win64>
<CfgParent>Base</CfgParent>
<Base>true</Base>
</PropertyGroup>
<PropertyGroup Condition="'$(Config)'=='Debug' or '$(Cfg_1)'!=''">
<Cfg_1>true</Cfg_1>
<CfgParent>Base</CfgParent>
<Base>true</Base>
</PropertyGroup>
<PropertyGroup Condition="('$(Platform)'=='Win32' and '$(Cfg_1)'=='true') or '$(Cfg_1_Win32)'!=''">
<Cfg_1_Win32>true</Cfg_1_Win32>
<CfgParent>Cfg_1</CfgParent>
<Cfg_1>true</Cfg_1>
<Base>true</Base>
</PropertyGroup>
<PropertyGroup Condition="'$(Config)'=='Release' or '$(Cfg_2)'!=''">
<Cfg_2>true</Cfg_2>
<CfgParent>Base</CfgParent>
<Base>true</Base>
</PropertyGroup>
<PropertyGroup Condition="'$(Base)'!=''">
<DCC_DcuOutput>.\$(Platform)\$(Config)</DCC_DcuOutput>
<DCC_ExeOutput>.\$(Platform)\$(Config)</DCC_ExeOutput>
<DCC_E>false</DCC_E>
<DCC_N>false</DCC_N>
<DCC_S>false</DCC_S>
<DCC_F>false</DCC_F>
<DCC_K>false</DCC_K>
<DCC_Namespace>System;Xml;Data;Datasnap;Web;Soap;$(DCC_Namespace)</DCC_Namespace>
<UsingDelphiRTL>true</UsingDelphiRTL>
<Icon_MainIcon>$(BDS)\bin\delphi_PROJECTICON.ico</Icon_MainIcon>
<Icns_MainIcns>$(BDS)\bin\delphi_PROJECTICNS.icns</Icns_MainIcns>
<DCC_UnitSearchPath>$(DMVC);$(DCC_UnitSearchPath)</DCC_UnitSearchPath>
<DCC_Framework>VCL;$(DCC_Framework)</DCC_Framework>
<SanitizedProjectName>avoid_mid_air_collisions_sample</SanitizedProjectName>
</PropertyGroup>
<PropertyGroup Condition="'$(Base_Android)'!=''">
<DCC_UsePackage>fmx;DbxCommonDriver;bindengine;IndyIPCommon;emsclient;FireDACCommonDriver;IndyProtocols;Skia.Package.RTL;RadiantShapesFmx_Design;IndyIPClient;dbxcds;FmxTeeUI;bindcompfmx;ibmonitor;FireDACSqliteDriver;DbxClientDriver;soapmidas;fmxFireDAC;dbexpress;Python;inet;DataSnapCommon;dbrtl;FireDACDBXDriver;Skia.Package.FMX;CustomIPTransport;DBXInterBaseDriver;IndySystem;RadiantShapesFmx;ibxbindings;bindcomp;FireDACCommon;IndyCore;RESTBackendComponents;bindcompdbx;rtl;RESTComponents;DBXSqliteDriver;IndyIPServer;dsnapxml;DataSnapClient;DataSnapProviderClient;DataSnapFireDAC;emsclientfiredac;FireDAC;FireDACDSDriver;xmlrtl;tethering;ibxpress;dsnap;CloudService;FMXTee;DataSnapNativeClient;PythonFmx;soaprtl;soapserver;FireDACIBDriver;$(DCC_UsePackage)</DCC_UsePackage>
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74
samples/middleware_etag/middleware_etag.dpr
View File

@ -8,11 +8,13 @@ uses
Web.WebReq,
Web.WebBroker,
IdHTTPWebBrokerBridge,
MVCFramework.REPLCommandsHandlerU,
MVCFramework,
MVCFramework.Signal,
MVCFramework.Logger,
WebModuleUnit1 in 'WebModuleUnit1.pas' {WebModule1: TWebModule},
App1MainControllerU in 'App1MainControllerU.pas',
MVCFramework.Middleware.ETag in '..\..\sources\MVCFramework.Middleware.ETag.pas';
MVCFramework.Middleware.ETag in '..\..\sources\MVCFramework.Middleware.ETag.pas',
MVCFramework.Commons;
{$R *.res}
@ -20,37 +22,9 @@ uses
procedure RunServer(APort: Integer);
var
lServer: TIdHTTPWebBrokerBridge;
lCustomHandler: TMVCCustomREPLCommandsHandler;
lCmd, lStartupCommand: string;
begin
if ParamCount >= 1 then
lStartupCommand := ParamStr(1)
else
lStartupCommand := 'start';
lCustomHandler := function(const Value: String; const Server: TIdHTTPWebBrokerBridge; out Handled: Boolean): THandleCommandResult
begin
Handled := False;
Result := THandleCommandResult.Unknown;
// Write here your custom command for the REPL using the following form...
// ***
// Handled := False;
// if (Value = 'apiversion') then
// begin
// REPLEmit('Print my API version number');
// Result := THandleCommandResult.Continue;
// Handled := True;
// end
// else if (Value = 'datetime') then
// begin
// REPLEmit(DateTimeToStr(Now));
// Result := THandleCommandResult.Continue;
// Handled := True;
// end;
end;
// Writeln(Format('Starting HTTP Server or port %d', [APort]));
Writeln('** DMVCFramework Server ** build ' + DMVCFRAMEWORK_VERSION);
Writeln(Format('Starting HTTP Server or port %d', [APort]));
LServer := TIdHTTPWebBrokerBridge.Create(nil);
try
LServer.DefaultPort := APort;
@ -64,37 +38,11 @@ begin
http://www.indyproject.org/docsite/html/frames.html?frmname=topic&frmfile=TIdCustomTCPServer_ListenQueue.html }
LServer.ListenQueue := 200;
WriteLn('Write "quit" or "exit" to shutdown the server');
repeat
// TextColor(RED);
// TextColor(LightRed);
Write('-> ');
// TextColor(White);
if lStartupCommand.IsEmpty then
ReadLn(lCmd)
else
begin
lCmd := lStartupCommand;
lStartupCommand := '';
WriteLn(lCmd);
end;
case HandleCommand(lCmd.ToLower, LServer, lCustomHandler) of
THandleCommandResult.Continue:
begin
Continue;
end;
THandleCommandResult.Break:
begin
Break;
end;
THandleCommandResult.Unknown:
begin
REPLEmit('Unknown command: ' + lCmd);
end;
end;
until false;
lServer.Active := True;
Write('CTRL+C to shutdown the server');
WaitForTerminationSignal;
EnterInShutdownState;
lServer.Active := False;
finally
LServer.Free;
end;

109
samples/middleware_etag/middleware_etag.dproj
View File

@ -1,7 +1,7 @@
<Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
<PropertyGroup>
<ProjectGuid>{BCE38CEB-AE61-49C6-8C51-8D6776B45034}</ProjectGuid>
<ProjectVersion>19.2</ProjectVersion>
<ProjectVersion>19.4</ProjectVersion>
<FrameworkType>None</FrameworkType>
<MainSource>middleware_etag.dpr</MainSource>
<Base>True</Base>
@ -13,6 +13,16 @@
<PropertyGroup Condition="'$(Config)'=='Base' or '$(Base)'!=''">
<Base>true</Base>
</PropertyGroup>
<PropertyGroup Condition="('$(Platform)'=='Android' and '$(Base)'=='true') or '$(Base_Android)'!=''">
<Base_Android>true</Base_Android>
<CfgParent>Base</CfgParent>
<Base>true</Base>
</PropertyGroup>
<PropertyGroup Condition="('$(Platform)'=='Android64' and '$(Base)'=='true') or '$(Base_Android64)'!=''">
<Base_Android64>true</Base_Android64>
<CfgParent>Base</CfgParent>
<Base>true</Base>
</PropertyGroup>
<PropertyGroup Condition="('$(Platform)'=='Win32' and '$(Base)'=='true') or '$(Base_Win32)'!=''">
<Base_Win32>true</Base_Win32>
<CfgParent>Base</CfgParent>
@ -67,6 +77,16 @@
<DCC_F>false</DCC_F>
<DCC_K>false</DCC_K>
</PropertyGroup>
<PropertyGroup Condition="'$(Base_Android)'!=''">
<VerInfo_Keys>package=com.embarcadero.$(MSBuildProjectName);label=$(MSBuildProjectName);versionCode=1;versionName=1.0.0;persistent=False;restoreAnyVersion=False;installLocation=auto;largeHeap=False;theme=TitleBar;hardwareAccelerated=true;apiKey=</VerInfo_Keys>
<BT_BuildType>Debug</BT_BuildType>
<EnabledSysJars>annotation-1.2.0.dex.jar;asynclayoutinflater-1.0.0.dex.jar;billing-4.0.0.dex.jar;browser-1.0.0.dex.jar;cloud-messaging.dex.jar;collection-1.0.0.dex.jar;coordinatorlayout-1.0.0.dex.jar;core-1.5.0-rc02.dex.jar;core-common-2.0.1.dex.jar;core-runtime-2.0.1.dex.jar;cursoradapter-1.0.0.dex.jar;customview-1.0.0.dex.jar;documentfile-1.0.0.dex.jar;drawerlayout-1.0.0.dex.jar;firebase-annotations-16.0.0.dex.jar;firebase-common-20.0.0.dex.jar;firebase-components-17.0.0.dex.jar;firebase-datatransport-18.0.0.dex.jar;firebase-encoders-17.0.0.dex.jar;firebase-encoders-json-18.0.0.dex.jar;firebase-iid-interop-17.1.0.dex.jar;firebase-installations-17.0.0.dex.jar;firebase-installations-interop-17.0.0.dex.jar;firebase-measurement-connector-19.0.0.dex.jar;firebase-messaging-22.0.0.dex.jar;fmx.dex.jar;fragment-1.0.0.dex.jar;google-play-licensing.dex.jar;interpolator-1.0.0.dex.jar;javax.inject-1.dex.jar;legacy-support-core-ui-1.0.0.dex.jar;legacy-support-core-utils-1.0.0.dex.jar;lifecycle-common-2.0.0.dex.jar;lifecycle-livedata-2.0.0.dex.jar;lifecycle-livedata-core-2.0.0.dex.jar;lifecycle-runtime-2.0.0.dex.jar;lifecycle-service-2.0.0.dex.jar;lifecycle-viewmodel-2.0.0.dex.jar;listenablefuture-1.0.dex.jar;loader-1.0.0.dex.jar;localbroadcastmanager-1.0.0.dex.jar;play-services-ads-20.1.0.dex.jar;play-services-ads-base-20.1.0.dex.jar;play-services-ads-identifier-17.0.0.dex.jar;play-services-ads-lite-20.1.0.dex.jar;play-services-base-17.5.0.dex.jar;play-services-basement-17.6.0.dex.jar;play-services-cloud-messaging-16.0.0.dex.jar;play-services-drive-17.0.0.dex.jar;play-services-games-21.0.0.dex.jar;play-services-location-18.0.0.dex.jar;play-services-maps-17.0.1.dex.jar;play-services-measurement-base-18.0.0.dex.jar;play-services-measurement-sdk-api-18.0.0.dex.jar;play-services-places-placereport-17.0.0.dex.jar;play-services-stats-17.0.0.dex.jar;play-services-tasks-17.2.0.dex.jar;print-1.0.0.dex.jar;room-common-2.1.0.dex.jar;room-runtime-2.1.0.dex.jar;slidingpanelayout-1.0.0.dex.jar;sqlite-2.0.1.dex.jar;sqlite-framework-2.0.1.dex.jar;swiperefreshlayout-1.0.0.dex.jar;transport-api-3.0.0.dex.jar;transport-backend-cct-3.0.0.dex.jar;transport-runtime-3.0.0.dex.jar;user-messaging-platform-1.0.0.dex.jar;versionedparcelable-1.1.1.dex.jar;viewpager-1.0.0.dex.jar;work-runtime-2.1.0.dex.jar</EnabledSysJars>
</PropertyGroup>
<PropertyGroup Condition="'$(Base_Android64)'!=''">
<VerInfo_Keys>package=com.embarcadero.$(MSBuildProjectName);label=$(MSBuildProjectName);versionCode=1;versionName=1.0.0;persistent=False;restoreAnyVersion=False;installLocation=auto;largeHeap=False;theme=TitleBar;hardwareAccelerated=true;apiKey=</VerInfo_Keys>
<BT_BuildType>Debug</BT_BuildType>
<EnabledSysJars>annotation-1.2.0.dex.jar;asynclayoutinflater-1.0.0.dex.jar;billing-4.0.0.dex.jar;browser-1.0.0.dex.jar;cloud-messaging.dex.jar;collection-1.0.0.dex.jar;coordinatorlayout-1.0.0.dex.jar;core-1.5.0-rc02.dex.jar;core-common-2.0.1.dex.jar;core-runtime-2.0.1.dex.jar;cursoradapter-1.0.0.dex.jar;customview-1.0.0.dex.jar;documentfile-1.0.0.dex.jar;drawerlayout-1.0.0.dex.jar;firebase-annotations-16.0.0.dex.jar;firebase-common-20.0.0.dex.jar;firebase-components-17.0.0.dex.jar;firebase-datatransport-18.0.0.dex.jar;firebase-encoders-17.0.0.dex.jar;firebase-encoders-json-18.0.0.dex.jar;firebase-iid-interop-17.1.0.dex.jar;firebase-installations-17.0.0.dex.jar;firebase-installations-interop-17.0.0.dex.jar;firebase-measurement-connector-19.0.0.dex.jar;firebase-messaging-22.0.0.dex.jar;fmx.dex.jar;fragment-1.0.0.dex.jar;google-play-licensing.dex.jar;interpolator-1.0.0.dex.jar;javax.inject-1.dex.jar;legacy-support-core-ui-1.0.0.dex.jar;legacy-support-core-utils-1.0.0.dex.jar;lifecycle-common-2.0.0.dex.jar;lifecycle-livedata-2.0.0.dex.jar;lifecycle-livedata-core-2.0.0.dex.jar;lifecycle-runtime-2.0.0.dex.jar;lifecycle-service-2.0.0.dex.jar;lifecycle-viewmodel-2.0.0.dex.jar;listenablefuture-1.0.dex.jar;loader-1.0.0.dex.jar;localbroadcastmanager-1.0.0.dex.jar;play-services-ads-20.1.0.dex.jar;play-services-ads-base-20.1.0.dex.jar;play-services-ads-identifier-17.0.0.dex.jar;play-services-ads-lite-20.1.0.dex.jar;play-services-base-17.5.0.dex.jar;play-services-basement-17.6.0.dex.jar;play-services-cloud-messaging-16.0.0.dex.jar;play-services-drive-17.0.0.dex.jar;play-services-games-21.0.0.dex.jar;play-services-location-18.0.0.dex.jar;play-services-maps-17.0.1.dex.jar;play-services-measurement-base-18.0.0.dex.jar;play-services-measurement-sdk-api-18.0.0.dex.jar;play-services-places-placereport-17.0.0.dex.jar;play-services-stats-17.0.0.dex.jar;play-services-tasks-17.2.0.dex.jar;print-1.0.0.dex.jar;room-common-2.1.0.dex.jar;room-runtime-2.1.0.dex.jar;slidingpanelayout-1.0.0.dex.jar;sqlite-2.0.1.dex.jar;sqlite-framework-2.0.1.dex.jar;swiperefreshlayout-1.0.0.dex.jar;transport-api-3.0.0.dex.jar;transport-backend-cct-3.0.0.dex.jar;transport-runtime-3.0.0.dex.jar;user-messaging-platform-1.0.0.dex.jar;versionedparcelable-1.1.1.dex.jar;viewpager-1.0.0.dex.jar;work-runtime-2.1.0.dex.jar</EnabledSysJars>
</PropertyGroup>
<PropertyGroup Condition="'$(Base_Win32)'!=''">
<DCC_Namespace>Winapi;System.Win;Data.Win;Datasnap.Win;Web.Win;Soap.Win;Xml.Win;Bde;$(DCC_Namespace)</DCC_Namespace>
<VerInfo_Locale>1033</VerInfo_Locale>
@ -113,10 +133,6 @@
</DCCReference>
<DCCReference Include="App1MainControllerU.pas"/>
<DCCReference Include="..\..\sources\MVCFramework.Middleware.ETag.pas"/>
<BuildConfiguration Include="Release">
<Key>Cfg_2</Key>
<CfgParent>Base</CfgParent>
</BuildConfiguration>
<BuildConfiguration Include="Base">
<Key>Base</Key>
</BuildConfiguration>
@ -124,6 +140,10 @@
<Key>Cfg_1</Key>
<CfgParent>Base</CfgParent>
</BuildConfiguration>
<BuildConfiguration Include="Release">
<Key>Cfg_2</Key>
<CfgParent>Base</CfgParent>
</BuildConfiguration>
</ItemGroup>
<ProjectExtensions>
<Borland.Personality>Delphi.Personality.12</Borland.Personality>
@ -174,22 +194,6 @@
</Excluded_Packages>
</Delphi.Personality>
<Deployment Version="3">
<DeployFile LocalName="$(BDS)\Redist\osx32\libcgunwind.1.0.dylib" Class="DependencyModule">
<Platform Name="OSX32">
<Overwrite>true</Overwrite>
</Platform>
</DeployFile>
<DeployFile LocalName="bin\middleware_etag.exe" Configuration="Debug" Class="ProjectOutput">
<Platform Name="Win32">
<RemoteName>middleware_etag.exe</RemoteName>
<Overwrite>true</Overwrite>
</Platform>
</DeployFile>
<DeployFile LocalName="$(BDS)\Redist\iossimulator\libPCRE.dylib" Class="DependencyModule">
<Platform Name="iOSSimulator">
<Overwrite>true</Overwrite>
</Platform>
</DeployFile>
<DeployFile LocalName="$(BDS)\Redist\iossimulator\libcgunwind.1.0.dylib" Class="DependencyModule">
<Platform Name="iOSSimulator">
<Overwrite>true</Overwrite>
@ -200,11 +204,27 @@
<Overwrite>true</Overwrite>
</Platform>
</DeployFile>
<DeployFile LocalName="$(BDS)\Redist\iossimulator\libPCRE.dylib" Class="DependencyModule">
<Platform Name="iOSSimulator">
<Overwrite>true</Overwrite>
</Platform>
</DeployFile>
<DeployFile LocalName="$(BDS)\Redist\osx32\libcgsqlite3.dylib" Class="DependencyModule">
<Platform Name="OSX32">
<Overwrite>true</Overwrite>
</Platform>
</DeployFile>
<DeployFile LocalName="$(BDS)\Redist\osx32\libcgunwind.1.0.dylib" Class="DependencyModule">
<Platform Name="OSX32">
<Overwrite>true</Overwrite>
</Platform>
</DeployFile>
<DeployFile LocalName="bin\middleware_etag.exe" Configuration="Debug" Class="ProjectOutput">
<Platform Name="Win32">
<RemoteName>middleware_etag.exe</RemoteName>
<Overwrite>true</Overwrite>
</Platform>
</DeployFile>
<DeployFile LocalName="Linux64\Debug\middleware_etag" Configuration="Debug" Class="ProjectOutput">
<Platform Name="Linux64">
<RemoteName>middleware_etag</RemoteName>
@ -219,6 +239,16 @@
<Operation>0</Operation>
</Platform>
</DeployClass>
<DeployClass Name="AndroidClasses">
<Platform Name="Android">
<RemoteDir>classes</RemoteDir>
<Operation>64</Operation>
</Platform>
<Platform Name="Android64">
<RemoteDir>classes</RemoteDir>
<Operation>64</Operation>
</Platform>
</DeployClass>
<DeployClass Name="AndroidClassesDexFile">
<Platform Name="Android">
<RemoteDir>classes</RemoteDir>
@ -517,6 +547,10 @@
<Operation>1</Operation>
<Extensions>.framework</Extensions>
</Platform>
<Platform Name="OSXARM64">
<Operation>1</Operation>
<Extensions>.framework</Extensions>
</Platform>
<Platform Name="Win32">
<Operation>0</Operation>
</Platform>
@ -530,6 +564,10 @@
<Operation>1</Operation>
<Extensions>.dylib</Extensions>
</Platform>
<Platform Name="OSXARM64">
<Operation>1</Operation>
<Extensions>.dylib</Extensions>
</Platform>
<Platform Name="Win32">
<Operation>0</Operation>
<Extensions>.dll;.bpl</Extensions>
@ -556,6 +594,10 @@
<Operation>1</Operation>
<Extensions>.dylib</Extensions>
</Platform>
<Platform Name="OSXARM64">
<Operation>1</Operation>
<Extensions>.dylib</Extensions>
</Platform>
<Platform Name="Win32">
<Operation>0</Operation>
<Extensions>.bpl</Extensions>
@ -583,6 +625,9 @@
<Platform Name="OSX64">
<Operation>0</Operation>
</Platform>
<Platform Name="OSXARM64">
<Operation>0</Operation>
</Platform>
<Platform Name="Win32">
<Operation>0</Operation>
</Platform>
@ -1136,6 +1181,10 @@
<RemoteDir>Contents\Resources</RemoteDir>
<Operation>1</Operation>
</Platform>
<Platform Name="OSXARM64">
<RemoteDir>Contents\Resources</RemoteDir>
<Operation>1</Operation>
</Platform>
</DeployClass>
<DeployClass Required="true" Name="ProjectOutput">
<Platform Name="Android">
@ -1164,6 +1213,9 @@
<Platform Name="OSX64">
<Operation>1</Operation>
</Platform>
<Platform Name="OSXARM64">
<Operation>1</Operation>
</Platform>
<Platform Name="Win32">
<Operation>0</Operation>
</Platform>
@ -1202,18 +1254,21 @@
<Operation>1</Operation>
</Platform>
</DeployClass>
<ProjectRoot Platform="iOSDevice64" Name="$(PROJECTNAME).app"/>
<ProjectRoot Platform="Win64" Name="$(PROJECTNAME)"/>
<ProjectRoot Platform="Android" Name="$(PROJECTNAME)"/>
<ProjectRoot Platform="Android64" Name="$(PROJECTNAME)"/>
<ProjectRoot Platform="iOSDevice32" Name="$(PROJECTNAME).app"/>
<ProjectRoot Platform="Win32" Name="$(PROJECTNAME)"/>
<ProjectRoot Platform="iOSDevice64" Name="$(PROJECTNAME).app"/>
<ProjectRoot Platform="iOSSimulator" Name="$(PROJECTNAME).app"/>
<ProjectRoot Platform="Linux64" Name="$(PROJECTNAME)"/>
<ProjectRoot Platform="OSX32" Name="$(PROJECTNAME)"/>
<ProjectRoot Platform="Android" Name="$(PROJECTNAME)"/>
<ProjectRoot Platform="OSX64" Name="$(PROJECTNAME)"/>
<ProjectRoot Platform="iOSSimulator" Name="$(PROJECTNAME).app"/>
<ProjectRoot Platform="Android64" Name="$(PROJECTNAME)"/>
<ProjectRoot Platform="OSXARM64" Name="$(PROJECTNAME)"/>
<ProjectRoot Platform="Win32" Name="$(PROJECTNAME)"/>
<ProjectRoot Platform="Win64" Name="$(PROJECTNAME)"/>
</Deployment>
<Platforms>
<Platform value="Android">False</Platform>
<Platform value="Android64">False</Platform>
<Platform value="Linux64">True</Platform>
<Platform value="Win32">True</Platform>
<Platform value="Win64">False</Platform>

41
sources/MVCFramework.Cache.pas
View File

@ -56,10 +56,13 @@ type
constructor Create;
destructor Destroy; override;
function SetValue(const AName: string; const AValue: TValue): TMVCCacheItem;
procedure RemoveItem(const AName: string);
function Contains(const AName: string; out AValue: TValue): Boolean;
function ContainsItem(const AName: string; out AItem: TMVCCacheItem): Boolean;
function GetValue(const AName: string): TValue;
function ExecOnItemWithWriteLock(const AName: string; const AAction: TProc<TValue>): Boolean;
procedure BeginWrite;
procedure EndWrite;
end;
TMVCCacheSingleton = class
@ -123,6 +126,11 @@ begin
Result := lCacheItem;
end;
procedure TMVCCache.EndWrite;
begin
FMREW.EndWrite;
end;
function TMVCCache.ExecOnItemWithWriteLock(const AName: string; const AAction: TProc<TValue>): Boolean;
var
lItem: TMVCCacheItem;
@ -140,6 +148,11 @@ begin
end;
end;
procedure TMVCCache.BeginWrite;
begin
FMREW.BeginWrite;
end;
function TMVCCache.Contains(const AName: string; out AValue: TValue): Boolean;
var
lItem: TMVCCacheItem;
@ -149,8 +162,7 @@ begin
AValue := lItem.Value;
end;
function TMVCCache.ContainsItem(const AName: string;
out AItem: TMVCCacheItem): Boolean;
function TMVCCache.ContainsItem(const AName: string; out AItem: TMVCCacheItem): Boolean;
var
lItem: TMVCCacheItem;
lRes: Boolean;
@ -196,6 +208,26 @@ begin
Result := lResult;
end;
procedure TMVCCache.RemoveItem(const AName: string);
var
lCacheItem: TMVCCacheItem;
begin
FMREW.DoWithWriteLock(
procedure
var
lItem: TMVCCacheItem;
begin
if FStorage.TryGetValue(AName, lItem) then
begin
if lItem.Value.IsObjectInstance then
begin
lItem.Value.AsObject.Free;
end;
FStorage.Remove(AName);
end
end);
end;
{ TMVCFrameworkCacheItem }
constructor TMVCCacheItem.Create;
@ -280,8 +312,7 @@ begin
inherited;
end;
function TMVCThreadedObjectCache<T>.TryGetValue(const Key: String;
out Value: T): Boolean;
function TMVCThreadedObjectCache<T>.TryGetValue(const Key: String; out Value: T): Boolean;
begin
fCS.Enter;
try
@ -291,6 +322,4 @@ begin
end;
end;
end.

38
sources/MVCFramework.Middleware.ETag.pas
View File

@ -43,8 +43,6 @@ type
/// 7232</see>
/// </summary>
TMVCETagMiddleware = class(TInterfacedObject, IMVCMiddleware)
private
function GetHashMD5FromStream(AStream: TStream): string;
public
procedure OnBeforeRouting(AContext: TWebContext; var AHandled: Boolean);
procedure OnBeforeControllerAction(AContext: TWebContext; const AControllerQualifiedClassName: string;
@ -57,35 +55,13 @@ type
implementation
uses
{$IF defined(TOKYOORBETTER)}
System.Hash,
{$ELSE}
IdHashMessageDigest,
{$ENDIF}
System.SysUtils,
MVCFramework.Commons;
MVCFramework.Commons, MVCFramework.Utils;
{ TMVCETagMiddleware }
function TMVCETagMiddleware.GetHashMD5FromStream(AStream: TStream): string;
{$IF not defined(TOKYOORBETTER)}
var
lMD5Hash: TIdHashMessageDigest5;
{$ENDIF}
begin
{$IF defined(TOKYOORBETTER)}
Result := THashMD5.GetHashString(AStream);
{$ELSE}
lMD5Hash := TIdHashMessageDigest5.Create;
try
Result := lMD5Hash.HashStreamAsHex(AStream);
finally
lMD5Hash.Free;
end;
{$ENDIF}
end;
procedure TMVCETagMiddleware.OnAfterControllerAction(AContext: TWebContext;
procedure TMVCETagMiddleware.OnAfterControllerAction(AContext: TWebContext;
const AControllerQualifiedClassName: string;
const AActionName: string;
const AHandled: Boolean);
@ -101,10 +77,18 @@ var
begin
lContentStream := AContext.Response.RawWebResponse.ContentStream;
if not Assigned(lContentStream) then
begin
Exit;
end;
if not AContext.Response.RawWebResponse.GetCustomHeader('ETag').IsEmpty then
begin
Exit;
end;
// https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/ETag#caching_of_unchanged_resources
lRequestETag := AContext.Request.Headers['If-None-Match'];
lETag := GetHashMD5FromStream(lContentStream);
lETag := GetMD5HashFromStream(lContentStream);
lContentStream.Position := 0;
AContext.Response.SetCustomHeader('ETag', lETag);

49
sources/MVCFramework.Utils.pas
View File

@ -27,24 +27,67 @@ unit MVCFramework.Utils;
interface
uses
MVCFramework.Serializer.Commons, JsonDataObjects, MVCFramework.DuckTyping;
MVCFramework.Serializer.Commons, JsonDataObjects, MVCFramework.DuckTyping,
System.Classes;
function NewJSONSerializer: IMVCJSONSerializer;
function StrToJSONObject(const aString: String; ARaiseExceptionOnError: Boolean = False): TJsonObject;
function StrToJSONArray(const aString: String; ARaiseExceptionOnError: Boolean = False): TJsonArray;
function WrapAsList(const AObject: TObject; AOwnsObject: Boolean = False): IMVCList;
function GetMD5HashFromStream(AStream: TStream): string;
function GetMD5HashFromString(const AString: String): string;
implementation
uses
{$IF defined(TOKYOORBETTER)}
System.Hash,
{$ELSE}
IdHashMessageDigest,
{$ENDIF}
MVCFramework.Serializer.JsonDataObjects,
MVCFramework.Commons,
System.SysUtils,
System.TypInfo;
function GetMD5HashFromStream(AStream: TStream): string;
{$IF not defined(TOKYOORBETTER)}
var
lMD5Hash: TIdHashMessageDigest5;
{$ENDIF}
begin
{$IF defined(TOKYOORBETTER)}
Result := THashMD5.GetHashString(AStream);
{$ELSE}
lMD5Hash := TIdHashMessageDigest5.Create;
try
Result := lMD5Hash.HashStreamAsHex(AStream);
finally
lMD5Hash.Free;
end;
{$ENDIF}
end;
function GetMD5HashFromString(const AString: String): string;
{$IF not defined(TOKYOORBETTER)}
var
lMD5Hash: TIdHashMessageDigest5;
{$ENDIF}
begin
{$IF defined(TOKYOORBETTER)}
Result := THashMD5.GetHashString(AStream);
{$ELSE}
lMD5Hash := TIdHashMessageDigest5.Create;
try
Result := lMD5Hash.HashStringAsHex(AString);
finally
lMD5Hash.Free;
end;
{$ENDIF}
end;
function NewJSONSerializer: IMVCJSONSerializer;
begin
Result := TMVCJsonDataObjectsSerializer.Create;

37
sources/MVCFramework.pas
View File

@ -380,7 +380,6 @@ type
constructor Create(const AWebRequest: TWebRequest;
const ASerializers: TDictionary<string, IMVCSerializer>);
destructor Destroy; override;
function ClientIp: string;
function ClientPrefer(const AMediaType: string): Boolean;
function ClientPreferHTML: Boolean;
@ -806,6 +805,11 @@ type
function SessionAs<T: TWebSession>: T;
procedure RaiseSessionExpired; virtual;
// Avoiding mid-air collisions - support
procedure SetETag(const Data: String);
procedure CheckIfMatch(const Data: String);
// END - Avoiding mid-air collisions - support
// Properties
property Context: TWebContext read GetContext write FContext;
property Session: TWebSession read GetSession;
@ -1108,13 +1112,15 @@ uses
MVCFramework.JSONRPC,
MVCFramework.Router,
MVCFramework.Rtti.Utils,
MVCFramework.Serializer.HTML, MVCFramework.Serializer.Abstract;
MVCFramework.Serializer.HTML, MVCFramework.Serializer.Abstract,
MVCFramework.Utils;
var
gIsShuttingDown: Int64 = 0;
gMVCGlobalActionParamsCache: TMVCStringObjectDictionary<TMVCActionParamCacheItem> = nil;
gHostingFramework: TMVCHostingFrameworkType = hftUnknown;
function IsShuttingDown: Boolean;
begin
Result := TInterlocked.Read(gIsShuttingDown) = 1
@ -3366,6 +3372,28 @@ end;
{ TMVCController }
procedure TMVCController.CheckIfMatch(const Data: String);
var
lReqETag: String;
begin
if Data.IsEmpty then
begin
raise EMVCException.Create(HTTP_STATUS.InternalServerError, 'Cannot calculate ETag using empty value');
end;
// https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/ETag#avoiding_mid-air_collisions
lReqETag := Context.Request.GetHeader('If-Match');
if lReqETag.IsEmpty then
begin
raise EMVCException.Create(HTTP_STATUS.PreconditionFailed, 'If-Match header is empty');
end;
if lReqETag <> GetMD5HashFromString(Data) then
begin
raise EMVCException.Create(HTTP_STATUS.PreconditionFailed, 'mid-air collisions detected, cannot update or delete resource.');
end;
end;
constructor TMVCController.Create;
begin
inherited Create;
@ -3693,6 +3721,11 @@ begin
Result := MVCFramework.DuckTyping.WrapAsList(AObject, AOwnsObject);
end;
procedure TMVCController.SetETag(const Data: String);
begin
Context.Response.SetCustomHeader('ETag', GetMD5HashFromString(Data));
end;
procedure TMVCController.SetViewData(const aModelName: string; const Value: TObject);
begin
GetViewModel.Add(aModelName, Value);