/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (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.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is mozilla.org code.
 *
 * The Initial Developer of the Original Code is
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 1998
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
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 * ***** END LICENSE BLOCK ***** */

#ifndef nsXMLHttpRequest_h__
#define nsXMLHttpRequest_h__

#include "nsIXMLHttpRequest.h"
#include "nsISupportsUtils.h"
#include "nsCOMPtr.h"
#include "nsString.h"
#include "nsIDOMLoadListener.h"
#include "nsIDOMEventTarget.h"
#include "nsIDOMNSEventTarget.h"
#include "nsIDOMDocument.h"
#include "nsIURI.h"
#include "nsIHttpChannel.h"
#include "nsIDocument.h"
#include "nsIStreamListener.h"
#include "nsWeakReference.h"
#include "jsapi.h"
#include "nsIScriptContext.h"
#include "nsIChannelEventSink.h"
#include "nsIInterfaceRequestor.h"
#include "nsIHttpHeaderVisitor.h"
#include "nsIProgressEventSink.h"
#include "nsCOMArray.h"
#include "nsJSUtils.h"
#include "nsTArray.h"
#include "nsCycleCollectionParticipant.h"
#include "nsIJSNativeInitializer.h"
#include "nsPIDOMWindow.h"
#include "nsIDOMLSProgressEvent.h"
#include "nsClassHashtable.h"
#include "nsHashKeys.h"
#include "prclist.h"
#include "prtime.h"
#include "nsIEventListenerManager.h"
#include "nsIDOMNSEvent.h"
#include "nsITimer.h"
#include "nsIPrivateDOMEvent.h"
#include "nsDOMProgressEvent.h"
#include "nsIScriptGlobalObject.h"

class nsILoadGroup;

class nsAccessControlLRUCache
{
public:
  struct TokenTime
  {
    nsCString token;
    PRTime expirationTime;
  };

  struct CacheEntry : public PRCList
  {
    CacheEntry(nsCString& aKey)
      : mKey(aKey)
    {
      MOZ_COUNT_CTOR(nsAccessControlLRUCache::CacheEntry);
    }
    
    ~CacheEntry()
    {
      MOZ_COUNT_DTOR(nsAccessControlLRUCache::CacheEntry);
    }

    void PurgeExpired(PRTime now);
    PRBool CheckRequest(const nsCString& aMethod,
                        const nsTArray<nsCString>& aCustomHeaders);

    nsCString mKey;
    nsTArray<TokenTime> mMethods;
    nsTArray<TokenTime> mHeaders;
  };

  nsAccessControlLRUCache()
  {
    MOZ_COUNT_CTOR(nsAccessControlLRUCache);
    PR_INIT_CLIST(&mList);
  }

  ~nsAccessControlLRUCache()
  {
    Clear();
    MOZ_COUNT_DTOR(nsAccessControlLRUCache);
  }

  PRBool Initialize()
  {
    return mTable.Init();
  }

  CacheEntry* GetEntry(nsIURI* aURI, nsIPrincipal* aPrincipal,
                       PRBool aWithCredentials, PRBool aCreate);
  void RemoveEntries(nsIURI* aURI, nsIPrincipal* aPrincipal);

  void Clear();

private:
  static PLDHashOperator
    RemoveExpiredEntries(const nsACString& aKey, nsAutoPtr<CacheEntry>& aValue,
                         void* aUserData);

  static PRBool GetCacheKey(nsIURI* aURI, nsIPrincipal* aPrincipal,
                            PRBool aWithCredentials, nsACString& _retval);

  nsClassHashtable<nsCStringHashKey, CacheEntry> mTable;
  PRCList mList;
};

class nsDOMEventListenerWrapper : public nsIDOMEventListener
{
public:
  nsDOMEventListenerWrapper(nsIDOMEventListener* aListener)
  : mListener(aListener) {}

  NS_DECL_CYCLE_COLLECTING_ISUPPORTS
  NS_DECL_CYCLE_COLLECTION_CLASS(nsDOMEventListenerWrapper)

  NS_DECL_NSIDOMEVENTLISTENER

  nsIDOMEventListener* GetInner() { return mListener; }
protected:
  nsCOMPtr<nsIDOMEventListener> mListener;
};

class nsXHREventTarget : public nsIXMLHttpRequestEventTarget,
                         public nsPIDOMEventTarget,
                         public nsIDOMNSEventTarget,
                         public nsWrapperCache
{
public:
  nsXHREventTarget() : mLang(nsIProgrammingLanguage::JAVASCRIPT) {}
  virtual ~nsXHREventTarget() {}
  NS_DECL_CYCLE_COLLECTING_ISUPPORTS
  NS_DECL_CYCLE_COLLECTION_CLASS_AMBIGUOUS(nsXHREventTarget,
                                           nsIXMLHttpRequestEventTarget)
  NS_DECL_NSIDOMNSEVENTTARGET
  NS_DECL_NSIXMLHTTPREQUESTEVENTTARGET
  NS_DECL_NSIDOMEVENTTARGET
  // nsPIDOMEventTarget
  virtual nsresult PreHandleEvent(nsEventChainPreVisitor& aVisitor);
  virtual nsresult PostHandleEvent(nsEventChainPostVisitor& aVisitor);
  virtual nsresult DispatchDOMEvent(nsEvent* aEvent, nsIDOMEvent* aDOMEvent,
                                    nsPresContext* aPresContext,
                                    nsEventStatus* aEventStatus);
  virtual nsresult GetListenerManager(PRBool aCreateIfNotFound,
                                      nsIEventListenerManager** aResult);
  virtual nsresult AddEventListenerByIID(nsIDOMEventListener *aListener,
                                         const nsIID& aIID);
  virtual nsresult RemoveEventListenerByIID(nsIDOMEventListener *aListener,
                                            const nsIID& aIID);
  virtual nsresult GetSystemEventGroup(nsIDOMEventGroup** aGroup);
  virtual nsIScriptContext* GetContextForEventHandlers(nsresult* aRv);

  PRBool HasListenersFor(const nsAString& aType)
  {
    return mListenerManager && mListenerManager->HasListenersFor(aType);
  }
  nsresult RemoveAddEventListener(const nsAString& aType,
                                  nsRefPtr<nsDOMEventListenerWrapper>& aCurrent,
                                  nsIDOMEventListener* aNew);

  nsresult GetInnerEventListener(nsRefPtr<nsDOMEventListenerWrapper>& aWrapper,
                                 nsIDOMEventListener** aListener);

  nsresult CheckInnerWindowCorrectness()
  {
    if (mOwner) {
      NS_ASSERTION(mOwner->IsInnerWindow(), "Should have inner window here!\n");
      nsPIDOMWindow* outer = mOwner->GetOuterWindow();
      if (!outer || outer->GetCurrentInnerWindow() != mOwner) {
        return NS_ERROR_FAILURE;
      }
    }
    return NS_OK;
  }

  void GetParentObject(nsIScriptGlobalObject **aParentObject)
  {
    if (mOwner) {
      CallQueryInterface(mOwner, aParentObject);
    }
    else {
      *aParentObject = nsnull;
    }
  }

  static nsXHREventTarget* FromSupports(nsISupports* aSupports)
  {
    nsIXMLHttpRequestEventTarget* target =
      static_cast<nsIXMLHttpRequestEventTarget*>(aSupports);
#ifdef DEBUG
    {
      nsCOMPtr<nsIXMLHttpRequestEventTarget> target_qi =
        do_QueryInterface(aSupports);

      // If this assertion fires the QI implementation for the object in
      // question doesn't use the nsIXMLHttpRequestEventTarget pointer as the
      // nsISupports pointer. That must be fixed, or we'll crash...
      NS_ASSERTION(target_qi == target, "Uh, fix QI!");
    }
#endif

    return static_cast<nsXHREventTarget*>(target);
  }

protected:
  nsRefPtr<nsDOMEventListenerWrapper> mOnLoadListener;
  nsRefPtr<nsDOMEventListenerWrapper> mOnErrorListener;
  nsRefPtr<nsDOMEventListenerWrapper> mOnAbortListener;
  nsRefPtr<nsDOMEventListenerWrapper> mOnLoadStartListener;
  nsRefPtr<nsDOMEventListenerWrapper> mOnProgressListener;
  nsCOMPtr<nsIEventListenerManager> mListenerManager;
  PRUint32 mLang;
  // These may be null (native callers or xpcshell).
  nsCOMPtr<nsIScriptContext> mScriptContext;
  nsCOMPtr<nsPIDOMWindow>    mOwner; // Inner window.
};

class nsXMLHttpRequestUpload : public nsXHREventTarget,
                               public nsIXMLHttpRequestUpload
{
public:
  nsXMLHttpRequestUpload(nsPIDOMWindow* aOwner,
                         nsIScriptContext* aScriptContext)
  {
    mOwner = aOwner;
    mScriptContext = aScriptContext;
  }
  virtual ~nsXMLHttpRequestUpload();
  NS_DECL_ISUPPORTS_INHERITED
  NS_FORWARD_NSIXMLHTTPREQUESTEVENTTARGET(nsXHREventTarget::)
  NS_FORWARD_NSIDOMEVENTTARGET(nsXHREventTarget::)
  NS_FORWARD_NSIDOMNSEVENTTARGET(nsXHREventTarget::)
  NS_DECL_NSIXMLHTTPREQUESTUPLOAD

  PRBool HasListeners()
  {
    return mListenerManager && mListenerManager->HasListeners();
  }
};

class nsXMLHttpRequest : public nsXHREventTarget,
                         public nsIXMLHttpRequest,
                         public nsIJSXMLHttpRequest,
                         public nsIDOMLoadListener,
                         public nsIStreamListener,
                         public nsIChannelEventSink,
                         public nsIProgressEventSink,
                         public nsIInterfaceRequestor,
                         public nsSupportsWeakReference,
                         public nsIJSNativeInitializer,
                         public nsITimerCallback
{
public:
  nsXMLHttpRequest();
  virtual ~nsXMLHttpRequest();

  NS_DECL_ISUPPORTS_INHERITED

  // nsIXMLHttpRequest
  NS_DECL_NSIXMLHTTPREQUEST

  // nsIJSXMLHttpRequest
  NS_IMETHOD GetOnuploadprogress(nsIDOMEventListener** aOnuploadprogress);
  NS_IMETHOD SetOnuploadprogress(nsIDOMEventListener* aOnuploadprogress);

  NS_FORWARD_NSIXMLHTTPREQUESTEVENTTARGET(nsXHREventTarget::)

  // nsIDOMEventListener
  NS_DECL_NSIDOMEVENTLISTENER

  // nsIDOMLoadListener
  NS_IMETHOD Load(nsIDOMEvent* aEvent);
  NS_IMETHOD BeforeUnload(nsIDOMEvent* aEvent);
  NS_IMETHOD Unload(nsIDOMEvent* aEvent);
  NS_IMETHOD Abort(nsIDOMEvent* aEvent);
  NS_IMETHOD Error(nsIDOMEvent* aEvent);

  // nsIStreamListener
  NS_DECL_NSISTREAMLISTENER

  // nsIRequestObserver
  NS_DECL_NSIREQUESTOBSERVER

  // nsIChannelEventSink
  NS_DECL_NSICHANNELEVENTSINK

  // nsIProgressEventSink
  NS_DECL_NSIPROGRESSEVENTSINK

  // nsIInterfaceRequestor
  NS_DECL_NSIINTERFACEREQUESTOR

  // nsITimerCallback
  NS_DECL_NSITIMERCALLBACK

  // nsIJSNativeInitializer
  NS_IMETHOD Initialize(nsISupports* aOwner, JSContext* cx, JSObject* obj,
                       PRUint32 argc, jsval* argv);


  // This creates a trusted readystatechange event, which is not cancelable and
  // doesn't bubble.
  static nsresult CreateReadystatechangeEvent(nsIDOMEvent** aDOMEvent);
  // For backwards compatibility aPosition should contain the headers for upload
  // and aTotalSize is LL_MAXUINT when unknown. Both those values are
  // used by nsXMLHttpProgressEvent. Normal progress event should not use
  // headers in aLoaded and aTotal is 0 when unknown.
  void DispatchProgressEvent(nsPIDOMEventTarget* aTarget,
                             const nsAString& aType,
                             // Whether to use nsXMLHttpProgressEvent,
                             // which implements LS Progress Event.
                             PRBool aUseLSEventWrapper,
                             PRBool aLengthComputable,
                             // For Progress Events
                             PRUint64 aLoaded, PRUint64 aTotal,
                             // For LS Progress Events
                             PRUint64 aPosition, PRUint64 aTotalSize);
  void DispatchProgressEvent(nsPIDOMEventTarget* aTarget,
                             const nsAString& aType,
                             PRBool aLengthComputable,
                             PRUint64 aLoaded, PRUint64 aTotal)
  {
    DispatchProgressEvent(aTarget, aType, PR_FALSE,
                          aLengthComputable, aLoaded, aTotal,
                          aLoaded, aLengthComputable ? aTotal : LL_MAXUINT);
  }

  // This is called by the factory constructor.
  nsresult Init();

  void SetRequestObserver(nsIRequestObserver* aObserver);

  NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(nsXMLHttpRequest,
                                           nsXHREventTarget)

  static PRBool EnsureACCache()
  {
    if (sAccessControlCache)
      return PR_TRUE;

    nsAutoPtr<nsAccessControlLRUCache> newCache(new nsAccessControlLRUCache());
    NS_ENSURE_TRUE(newCache, PR_FALSE);

    if (newCache->Initialize()) {
      sAccessControlCache = newCache.forget();
      return PR_TRUE;
    }

    return PR_FALSE;
  }

  static void ShutdownACCache()
  {
    delete sAccessControlCache;
    sAccessControlCache = nsnull;
  }

  PRBool AllowUploadProgress();

  static nsAccessControlLRUCache* sAccessControlCache;

protected:
  friend class nsMultipartProxyListener;

  nsresult DetectCharset(nsACString& aCharset);
  nsresult ConvertBodyToText(nsAString& aOutBuffer);
  static NS_METHOD StreamReaderFunc(nsIInputStream* in,
                void* closure,
                const char* fromRawSegment,
                PRUint32 toOffset,
                PRUint32 count,
                PRUint32 *writeCount);
  // Change the state of the object with this. The broadcast argument
  // determines if the onreadystatechange listener should be called.
  nsresult ChangeState(PRUint32 aState, PRBool aBroadcast = PR_TRUE);
  nsresult RequestCompleted();
  nsresult GetLoadGroup(nsILoadGroup **aLoadGroup);
  nsIURI *GetBaseURI();

  nsresult RemoveAddEventListener(const nsAString& aType,
                                  nsRefPtr<nsDOMEventListenerWrapper>& aCurrent,
                                  nsIDOMEventListener* aNew);

  nsresult GetInnerEventListener(nsRefPtr<nsDOMEventListenerWrapper>& aWrapper,
                                 nsIDOMEventListener** aListener);

  already_AddRefed<nsIHttpChannel> GetCurrentHttpChannel();

  /**
   * Check if aChannel is ok for a cross-site request by making sure no
   * inappropriate headers are set, and no username/password is set.
   *
   * Also updates the XML_HTTP_REQUEST_USE_XSITE_AC bit.
   */
  nsresult CheckChannelForCrossSiteRequest(nsIChannel* aChannel);

  void StartProgressEventTimer();

  nsCOMPtr<nsISupports> mContext;
  nsCOMPtr<nsIPrincipal> mPrincipal;
  nsCOMPtr<nsIChannel> mChannel;
  // mReadRequest is different from mChannel for multipart requests
  nsCOMPtr<nsIRequest> mReadRequest;
  nsCOMPtr<nsIDOMDocument> mResponseXML;
  nsCOMPtr<nsIChannel> mACGetChannel;
  nsTArray<nsCString> mACUnsafeHeaders;

  nsRefPtr<nsDOMEventListenerWrapper> mOnUploadProgressListener;
  nsRefPtr<nsDOMEventListenerWrapper> mOnReadystatechangeListener;

  nsCOMPtr<nsIStreamListener> mXMLParserStreamListener;

  // used to implement getAllResponseHeaders()
  class nsHeaderVisitor : public nsIHttpHeaderVisitor {
  public:
    NS_DECL_ISUPPORTS
    NS_DECL_NSIHTTPHEADERVISITOR
    nsHeaderVisitor() { }
    virtual ~nsHeaderVisitor() {}
    const nsACString &Headers() { return mHeaders; }
  private:
    nsCString mHeaders;
  };

  nsCString mResponseBody;

  nsCString mOverrideMimeType;

  /**
   * The notification callbacks the channel had when Send() was
   * called.  We want to forward things here as needed.
   */
  nsCOMPtr<nsIInterfaceRequestor> mNotificationCallbacks;
  /**
   * Sink interfaces that we implement that mNotificationCallbacks may
   * want to also be notified for.  These are inited lazily if we're
   * asked for the relevant interface.
   */
  nsCOMPtr<nsIChannelEventSink> mChannelEventSink;
  nsCOMPtr<nsIProgressEventSink> mProgressEventSink;

  nsIRequestObserver* mRequestObserver;

  nsCOMPtr<nsIURI> mBaseURI;

  PRUint32 mState;

  nsRefPtr<nsXMLHttpRequestUpload> mUpload;
  PRUint64 mUploadTransferred;
  PRUint64 mUploadTotal;
  PRPackedBool mUploadComplete;
  PRUint64 mUploadProgress; // For legacy
  PRUint64 mUploadProgressMax; // For legacy

  PRPackedBool mErrorLoad;

  PRPackedBool mTimerIsActive;
  PRPackedBool mProgressEventWasDelayed;
  PRPackedBool mLoadLengthComputable;
  PRUint64 mLoadTotal; // 0 if not known.
  nsCOMPtr<nsITimer> mProgressNotifier;

  PRPackedBool mFirstStartRequestSeen;
};

// helper class to expose a progress DOM Event

class nsXMLHttpProgressEvent : public nsIDOMProgressEvent,
                               public nsIDOMLSProgressEvent,
                               public nsIDOMNSEvent,
                               public nsIPrivateDOMEvent
{
public:
  nsXMLHttpProgressEvent(nsIDOMProgressEvent* aInner,
                         PRUint64 aCurrentProgress,
                         PRUint64 aMaxProgress);
  virtual ~nsXMLHttpProgressEvent();

  NS_DECL_CYCLE_COLLECTING_ISUPPORTS
  NS_DECL_CYCLE_COLLECTION_CLASS_AMBIGUOUS(nsXMLHttpProgressEvent, nsIDOMNSEvent)
  NS_FORWARD_NSIDOMEVENT(mInner->)
  NS_FORWARD_NSIDOMNSEVENT(mInner->)
  NS_FORWARD_NSIDOMPROGRESSEVENT(mInner->)
  NS_DECL_NSIDOMLSPROGRESSEVENT
  // nsPrivateDOMEvent
  NS_IMETHOD DuplicatePrivateData()
  {
    return mInner->DuplicatePrivateData();
  }
  NS_IMETHOD SetTarget(nsIDOMEventTarget* aTarget)
  {
    return mInner->SetTarget(aTarget);
  }
  NS_IMETHOD SetCurrentTarget(nsIDOMEventTarget* aTarget)
  {
    return mInner->SetCurrentTarget(aTarget);
  }
  NS_IMETHOD SetOriginalTarget(nsIDOMEventTarget* aTarget)
  {
    return mInner->SetOriginalTarget(aTarget);
  }
  NS_IMETHOD_(PRBool) IsDispatchStopped()
  {
    return mInner->IsDispatchStopped();
  }
  NS_IMETHOD_(nsEvent*) GetInternalNSEvent()
  {
    return mInner->GetInternalNSEvent();
  }
  NS_IMETHOD_(PRBool) HasOriginalTarget()
  {
    return mInner->HasOriginalTarget();
  }
  NS_IMETHOD SetTrusted(PRBool aTrusted)
  {
    return mInner->SetTrusted(aTrusted);
  }

protected:
  // Use nsDOMProgressEvent so that we can forward
  // most of the method calls easily.
  nsRefPtr<nsDOMProgressEvent> mInner;
  PRUint64 mCurProgress;
  PRUint64 mMaxProgress;
};

#endif