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 /*
  *  This file is part of the KDE libraries
  *  Copyright (C) 2010 Maksim Orlovich <maksim@kde.org>
  *
  *  This library is free software; you can redistribute it and/or
  *  modify it under the terms of the GNU Lesser General Public
  *  License as published by the Free Software Foundation; either
  *  version 2 of the License, or (at your option) any later version.
  *
  *  This library 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.  See the GNU
  *  Lesser General Public License for more details.
  *
  *  You should have received a copy of the GNU Lesser General Public
  *  License along with this library; if not, write to the Free Software
  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
  */
 #include "khtml_part.h"
 #include "kjs_data.h"
 #include <dom/dom_exception.h>
 #include <kjs/array_instance.h>
 
 #include <QSet>
 
 using namespace DOM;
 using namespace khtml;
 
 namespace KJS
 {
 
 // HTML5 deep copy algorithm, as described in "2.7.5 Safe passing of structured data"
 static JSValue *cloneInternal(ExecState *exec, Interpreter *ctx, JSValue *in, QSet<JSObject *> &path)
 {
     if (exec->hadException()) { // e.g. OOM or DATA_CLONE_ERR
         return jsUndefined();
     }
 
     switch (in->type()) {
     case NumberType:
     case BooleanType:
     case UndefinedType:
     case NullType:
     case StringType:
         // Values -> can pass straight through.
         return in;
 
     case ObjectType: {
         JSObject *obj = in->getObject();
 
         // Some things are handled by creating a new wrapper for their value;
         // this includes both JS-builtin types like autoboxing wrappers, and
         // those of HTML5 types we support that have deep cloning specified.
         // This goes through valueClone.
         if (JSObject *copy = obj->valueClone(ctx)) {
             return copy;
         }
 
         // Otherwise, we can only clone if it it's an array or plain object
         // that isn't already on our path from the root
         if (path.contains(obj)) {
             setDOMException(exec, DOM::DOMException::DATA_CLONE_ERR);
             break;
         }
 
         path.insert(obj);
 
         JSObject *clone = nullptr;
         if (obj->inherits(&ArrayInstance::info)) {
             clone = new ArrayInstance(ctx->builtinArrayPrototype(), 0);
         } else if (!obj->classInfo()) { // plain object
             clone = new JSObject(ctx->builtinObjectPrototype());
         } else {
             // Something complicated and native -> error out
             setDOMException(exec, DOM::DOMException::DATA_CLONE_ERR);
             break;
         }
 
         // Copy over clones of properties
         PropertyNameArray props;
         obj->getOwnPropertyNames(exec, props, PropertyMap::ExcludeDontEnumProperties);
         for (PropertyNameArrayIterator i = props.begin(); i != props.end(); ++i) {
             JSValue *propVal = obj->get(exec, *i);
             clone->put(exec, *i, cloneInternal(exec, ctx, propVal, path)); // ### flags?
         }
 
         path.remove(obj);
 
         return clone;
     }
 
     default: // shouldn't happen!
         setDOMException(exec, DOM::DOMException::DATA_CLONE_ERR);
     }
 
     return jsUndefined();
 }
 
 JSValue *cloneData(ExecState *exec, JSValue *data)
 {
     QSet<JSObject *> visited;
     return cloneInternal(exec, exec->dynamicInterpreter(), data, visited);
 }
 
 class JSMessageData : public DOM::MessageEventImpl::Data
 {
 public:
     DOM::MessageEventImpl::DataType messageDataType() const override
     {
         return DOM::MessageEventImpl::JS_VALUE;
     }
 
     JSMessageData(JSValue *val): m_value(val) {}
 
     ProtectedPtr<JSValue> m_value;
 };
 
 DOM::MessageEventImpl::Data *encapsulateMessageEventData(ExecState *exec, Interpreter *ctx,
         JSValue *data)
 {
     QSet<JSObject *> visited;
     JSValue *copy = cloneInternal(exec, ctx, data, visited);
     if (exec->hadException()) {
         return nullptr;
     } else {
         return new JSMessageData(copy);
     }
 }
 
 JSValue *getMessageEventData(ExecState * /*exec*/, DOM::MessageEventImpl::Data *data)
 {
     if (data && data->messageDataType() == DOM::MessageEventImpl::JS_VALUE) {
         return static_cast<JSMessageData *>(data)->m_value.get();
     } else {
         return jsUndefined();
     }
 }
 
 //------------------------------------------------------------------------------
 DelayedPostMessage::DelayedPostMessage(KHTMLPart *_source,
                                        const QString &_sourceOrigin,
                                        const QString &_targetOrigin,
                                        JSValue *_payload):
     sourceOrigin(_sourceOrigin), targetOrigin(_targetOrigin), payload(_payload), source(_source)
 {}
 
 void DelayedPostMessage::mark()
 {
     if (!payload->marked()) {
         payload->mark();
     }
 }
 
 bool DelayedPostMessage::execute(Window *w)
 {
     KHTMLPart *part = qobject_cast<KHTMLPart *>(w->part());
     DOM::DocumentImpl *doc = part ? static_cast<DOM::DocumentImpl *>(part->document().handle()) : nullptr;
     KJSProxy *js = part ? KJSProxy::proxy(part) : nullptr;
 
     // qCDebug(KHTML_LOG) << doc << js << sourceOrigin << targetOrigin;
     if (doc && js) {
         // Verify destination.
         bool safe = false;
         if (targetOrigin == QLatin1String("*")) {
             safe = true;
         } else {
             RefPtr<SecurityOrigin> targetCtx =
                 SecurityOrigin::createFromString(targetOrigin);
             safe = doc->origin()->isSameSchemeHostPort(targetCtx.get());
         }
 
         if (safe) {
             RefPtr<MessageEventImpl> msg = new MessageEventImpl();
 
             DOM::MessageEventImpl::Data *data =
                 encapsulateMessageEventData(js->interpreter()->globalExec(),
                                             js->interpreter(), payload);
 
             msg->initMessageEvent("message",
                                   false, false, // doesn't bubble or cancel
                                   data,
                                   sourceOrigin,
                                   DOMString(), // lastEventId -- not here
                                   source.data());
             doc->dispatchWindowEvent(msg.get());
         } else {
             qCWarning(KHTML_LOG) << "PostMessage XSS check failed;"
                        << "target mask:" << targetOrigin
                        << "actual:" << doc->origin()->toString()
                        << "source:" << sourceOrigin;
         }
     }
 
     return true;
 }
 
 } // namespace KJS