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// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/renderer/external_host_bindings.h"
#include "base/values.h"
#include "chrome/common/render_messages.h"
#include "webkit/glue/webframe.h"
ExternalHostBindings::ExternalHostBindings() : frame_(NULL) {
BindMethod("postMessage", &ExternalHostBindings::postMessage);
BindProperty("onmessage", &on_message_handler_);
}
void ExternalHostBindings::postMessage(
const CppArgumentList& args, CppVariant* result) {
DCHECK(result);
// We need at least one argument (message) and at most 2 arguments.
// Also, the first argument must be a string
if (args.size() < 1 || args.size() > 2 || !args[0].isString()) {
result->Set(false);
return;
}
const std::string& message = args[0].ToString();
std::string target;
if (args.size() >= 2 && args[1].isString()) {
target = args[1].ToString();
} else {
target = "*";
}
std::string origin;
GURL origin_url(frame_->GetURL().GetOrigin());
if (origin_url.is_empty()) {
// If the origin is not a scheme/host/port tuple, then return the literal
// string "null".
origin = "null";
} else {
origin = origin_url.spec();
}
result->Set(sender()->Send(new ViewHostMsg_ForwardMessageToExternalHost(
routing_id(), message, origin, target)));
}
bool ExternalHostBindings::ForwardMessageFromExternalHost(
const std::string& message, const std::string& origin,
const std::string& target) {
if (!on_message_handler_.isObject())
return false;
bool status = false;
// TODO(tommi): Do the appropriate target check and drop the event if
// the target doesn't match the url of the current document.
// See: http://dev.w3.org/html5/spec/Overview.html#posting-messages
if (target.compare("*") != 0) {
DLOG(WARNING) << "Dropping posted message since the target wasn't '*' "
"and we haven't implemented parsing of the target param";
return false;
}
// Construct an event object, assign the origin to the origin member and
// assign message parameter to the 'data' member of the event.
NPObject* event_obj = NULL;
CreateMessageEvent(&event_obj);
if (!event_obj) {
NOTREACHED() << "CreateMessageEvent failed";
} else {
NPIdentifier init_message_event =
NPN_GetStringIdentifier("initMessageEvent");
NPVariant init_args[8];
STRINGN_TO_NPVARIANT("message", sizeof("message") - 1,
init_args[0]); // type
BOOLEAN_TO_NPVARIANT(false, init_args[1]); // canBubble
BOOLEAN_TO_NPVARIANT(true, init_args[2]); // cancelable
STRINGN_TO_NPVARIANT(message.c_str(), message.length(), \
init_args[3]); // data
STRINGN_TO_NPVARIANT(origin.c_str(), origin.length(), \
init_args[4]); // origin
STRINGN_TO_NPVARIANT("", 0, init_args[5]); // lastEventId
NULL_TO_NPVARIANT(init_args[6]); // source
NULL_TO_NPVARIANT(init_args[7]); // messagePort
NPVariant result;
NULL_TO_NPVARIANT(result);
status = NPN_Invoke(NULL, event_obj, init_message_event, init_args,
arraysize(init_args), &result);
DCHECK(status) << "Failed to initialize MessageEvent";
NPN_ReleaseVariantValue(&result);
if (status) {
NPVariant event_arg;
OBJECT_TO_NPVARIANT(event_obj, event_arg);
status = NPN_InvokeDefault(NULL, on_message_handler_.value.objectValue,
&event_arg, 1, &result);
// Don't DCHECK here in case the reason for the failure is a script error.
DLOG_IF(ERROR, !status) << "NPN_InvokeDefault failed";
NPN_ReleaseVariantValue(&result);
}
NPN_ReleaseObject(event_obj);
}
return status;
}
bool ExternalHostBindings::CreateMessageEvent(NPObject** message_event) {
DCHECK(message_event != NULL);
DCHECK(frame_ != NULL);
NPObject* window = frame_->GetWindowNPObject();
if (!window) {
NOTREACHED() << "frame_->GetWindowNPObject";
return false;
}
const char* identifier_names[] = {
"document",
"createEvent",
};
NPIdentifier identifiers[arraysize(identifier_names)] = {0};
NPN_GetStringIdentifiers(identifier_names, arraysize(identifier_names),
identifiers);
CppVariant document;
bool ok = NPN_GetProperty(NULL, window, identifiers[0], &document);
DCHECK(document.isObject());
bool success = false;
if (ok && document.isObject()) {
NPVariant result, event_type;
STRINGN_TO_NPVARIANT("MessageEvent", sizeof("MessageEvent") - 1, \
event_type);
success = NPN_Invoke(NULL, document.value.objectValue, identifiers[1],
&event_type, 1, &result);
DCHECK(!success || result.type == NPVariantType_Object);
if (result.type != NPVariantType_Object) {
DCHECK(success == false);
} else {
DCHECK(success != false);
// Pass the ownership to the caller (don't call ReleaseVariantValue).
*message_event = result.value.objectValue;
}
}
return success;
}
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