bool
TabContext::UpdateTabContextAfterSwap(const TabContext& aContext)
{
// This is only used after already initialized.
MOZ_ASSERT(mInitialized);
// The only permissable change is to `mIsMozBrowserElement`. All other fields
// must match for the change to be accepted.
if (aContext.OwnAppId() != OwnAppId() ||
aContext.mContainingAppId != mContainingAppId ||
aContext.mOriginAttributes != mOriginAttributes ||
aContext.mSignedPkgOriginNoSuffix != mSignedPkgOriginNoSuffix) {
return false;
}
mIsMozBrowserElement = aContext.mIsMozBrowserElement;
return true;
}
TabContext::TabContext(const IPCTabContext& aParams)
: mInitialized(true)
{
const IPCTabAppBrowserContext& appBrowser = aParams.appBrowserContext();
switch(appBrowser.type()) {
case IPCTabAppBrowserContext::TPopupIPCTabContext: {
const PopupIPCTabContext &ipcContext = appBrowser.get_PopupIPCTabContext();
TabContext *context;
if (ipcContext.openerParent()) {
context = static_cast<TabParent*>(ipcContext.openerParent());
if (context->IsBrowserElement() && !ipcContext.isBrowserElement()) {
// If the TabParent corresponds to a browser element, then it can only
// open other browser elements, for security reasons. We should have
// checked this before calling the TabContext constructor, so this is
// a fatal error.
MOZ_CRASH();
}
}
else if (ipcContext.openerChild()) {
context = static_cast<TabChild*>(ipcContext.openerChild());
}
else {
// This should be unreachable because PopupIPCTabContext::opener is not a
// nullable field.
MOZ_CRASH();
}
// If ipcContext is a browser element, then the opener's app-id becomes
// our containing app-id. Otherwise, our own and containing app-ids are
// directly inherited from our opener.
if (ipcContext.isBrowserElement()) {
mIsBrowser = true;
mOwnAppId = nsIScriptSecurityManager::NO_APP_ID;
mContainingAppId = context->OwnAppId();
}
else {
mIsBrowser = false;
mOwnAppId = context->mOwnAppId;
mContainingAppId = context->mContainingAppId;
}
break;
}
case IPCTabAppBrowserContext::TAppFrameIPCTabContext: {
const AppFrameIPCTabContext &ipcContext =
appBrowser.get_AppFrameIPCTabContext();
mIsBrowser = false;
mOwnAppId = ipcContext.ownAppId();
mContainingAppId = ipcContext.appFrameOwnerAppId();
break;
}
case IPCTabAppBrowserContext::TBrowserFrameIPCTabContext: {
const BrowserFrameIPCTabContext &ipcContext =
appBrowser.get_BrowserFrameIPCTabContext();
mIsBrowser = true;
mOwnAppId = nsIScriptSecurityManager::NO_APP_ID;
mContainingAppId = ipcContext.browserFrameOwnerAppId();
break;
}
case IPCTabAppBrowserContext::TVanillaFrameIPCTabContext: {
mIsBrowser = false;
mOwnAppId = nsIScriptSecurityManager::NO_APP_ID;
mContainingAppId = nsIScriptSecurityManager::NO_APP_ID;
break;
}
default: {
MOZ_CRASH();
}
}
mScrollingBehavior = aParams.scrollingBehavior();
}
