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/*
* Copyright 2008 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
#include "Debug.h"
#include "JSRunner.h"
#include "nsCOMPtr.h"
#include "nsIPrincipal.h"
#include "nsIScriptGlobalObject.h"
#include "nsIScriptObjectPrincipal.h"
#include "nsIURI.h"
#include "nsIXPConnect.h"
#if GECKO_VERSION >= 13000
#include "nsJSPrincipals.h"
#endif
#include "nsStringAPI.h"
// from js_runner_ff.cc in Gears (http://code.google.com/p/gears/)
bool JSRunner::eval(JSContext* ctx, JSObject* object, const std::string& script) {
// To eval the script, we need the JSPrincipals to be acquired through
// nsIPrincipal. nsIPrincipal can be queried through the
// nsIScriptObjectPrincipal interface on the Script Global Object. In order
// to get the Script Global Object, we need to request the private data
// associated with the global JSObject on the current context.
nsCOMPtr<nsIScriptGlobalObject> sgo;
nsISupports *priv = reinterpret_cast<nsISupports *>(JS_GetPrivate(
#if GECKO_VERSION < 13000
ctx,
#endif
object));
nsCOMPtr<nsIXPConnectWrappedNative> wrapped_native = do_QueryInterface(priv);
if (wrapped_native) {
// The global object is a XPConnect wrapped native, the native in
// the wrapper might be the nsIScriptGlobalObject.
sgo = do_QueryWrappedNative(wrapped_native);
} else {
sgo = do_QueryInterface(priv);
}
JSPrincipals *jsprin = nullptr;
std::string virtual_filename;
nsresult nr;
nsCOMPtr<nsIScriptObjectPrincipal> obj_prin = do_QueryInterface(sgo, &nr);
if (NS_FAILED(nr)) {
Debug::log(Debug::Error) << "Error getting object principal" << Debug::flush;
return false;
}
nsIPrincipal *principal = obj_prin->GetPrincipal();
if (!principal) {
Debug::log(Debug::Error) << "Error getting principal" << Debug::flush;
return false;
}
// Get the script scheme and host from the principal. This is the URI that
// Firefox treats this script as running from.
// If the codebase is null, the script may be running from a chrome context.
// In that case, don't construct a virtual filename.
nsCOMPtr<nsIURI> codebase;
nr = principal->GetURI(getter_AddRefs(codebase));
if (codebase) {
nsCString scheme;
nsCString host;
if (NS_FAILED(codebase->GetScheme(scheme)) ||
NS_FAILED(codebase->GetHostPort(host))) {
Debug::log(Debug::Error) << "Error getting codebase" << Debug::flush;
return false;
}
// Build a virtual filename that we'll run as. This is to workaround
// http://lxr.mozilla.org/seamonkey/source/dom/src/base/nsJSEnvironment.cpp#500
// Bug: https://bugzilla.mozilla.org/show_bug.cgi?id=387477
// The filename is being used as the security origin instead of the principal.
// TODO(zork): Remove this section if this bug is resolved.
virtual_filename = std::string(scheme.BeginReading());
virtual_filename += "://";
virtual_filename += host.BeginReading();
}
#if GECKO_VERSION >= 13000
jsprin = nsJSPrincipals::get(principal);
#else
principal->GetJSPrincipals(ctx, &jsprin);
#endif
if (jsprin == nullptr) {
Debug::log(Debug::Error) << "Get JSPrincial failed at JSRunner::eval"
<< Debug::flush;
return false;
}
// Set up the JS stack so that our context is on top. This is needed to
// play nicely with plugins that access the context stack, such as Firebug.
// nsCOMPtr<nsIJSContextStack> stack =
// do_GetService("@mozilla.org/js/xpc/ContextStack;1");
// if (!stack) { return false; }
//
// stack->Push(js_engine_context_);
uintN line_number_start = 0;
jsval rval;
JSBool js_ok = JS_EvaluateScriptForPrincipals(ctx, object, jsprin,
script.c_str(), script.length(), virtual_filename.c_str(),
line_number_start, &rval);
// Restore the context stack.
// JSContext *cx;
// stack->Pop(&cx);
// Decrements ref count on jsprin (Was added in GetJSPrincipals()).
#if GECKO_VERSION >= 13000
(void) JS_DropPrincipals(JS_GetRuntime(ctx), jsprin);
#else
(void) JSPRINCIPALS_DROP(ctx, jsprin);
#endif
if (!js_ok) {
Debug::log(Debug::Error) << "JS execution failed in JSRunner::eval"
<< Debug::flush;
return false;
}
return true;
}