Index: webkit/plugins/ppapi/message_channel.cc |
=================================================================== |
--- webkit/plugins/ppapi/message_channel.cc (revision 0) |
+++ webkit/plugins/ppapi/message_channel.cc (revision 0) |
@@ -0,0 +1,343 @@ |
+// Copyright (c) 2011 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 "webkit/plugins/ppapi/message_channel.h" |
+ |
+#include <cstdlib> |
+#include <cstring> |
+#include <string> |
+ |
+#include "base/logging.h" |
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebBindings.h" |
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebDocument.h" |
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebElement.h" |
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebFrame.h" |
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebPluginContainer.h" |
+#include "webkit/plugins/ppapi/npapi_glue.h" |
+#include "webkit/plugins/ppapi/ppapi_plugin_instance.h" |
+#include "webkit/plugins/ppapi/var.h" |
+ |
+using WebKit::WebBindings; |
+ |
+namespace webkit { |
+namespace ppapi { |
+ |
+namespace { |
+ |
+const char kPostMessage[] = "postMessage"; |
+ |
+// Helper function to determine if a given identifier is equal to kPostMessage. |
+bool IdentifierIsPostMessage(NPIdentifier identifier) { |
+ const NPUTF8* id_as_string = NULL; |
+ int32_t int_value = 0; |
+ bool is_string = false; |
+ WebBindings::extractIdentifierData(identifier, id_as_string, int_value, |
+ is_string); |
+ if (is_string) |
+ return (std::strcmp(id_as_string, kPostMessage) == 0); |
+ return false; |
+} |
+ |
+// Converts the given PP_Var to an NPVariant, returning true on success. |
+// False means that the given variant is invalid. In this case, the result |
+// NPVariant will be set to a void one. |
+// |
+// The contents of the PP_Var will NOT be copied, so you need to ensure that |
+// the PP_Var remains valid while the resultant NPVariant is in use. |
+// |
+// |
+// Note: This is largely copied from var.cc so that we don't depend on code |
+// which will be removed. TODO(dmichael) remove this comment when var |
+// is removed. |
+bool PPVarToNPVariantNoCopy(PP_Var var, NPVariant* result) { |
+ switch (var.type) { |
+ case PP_VARTYPE_UNDEFINED: |
+ VOID_TO_NPVARIANT(*result); |
+ break; |
+ case PP_VARTYPE_NULL: |
+ NULL_TO_NPVARIANT(*result); |
+ break; |
+ case PP_VARTYPE_BOOL: |
+ BOOLEAN_TO_NPVARIANT(var.value.as_bool, *result); |
+ break; |
+ case PP_VARTYPE_INT32: |
+ INT32_TO_NPVARIANT(var.value.as_int, *result); |
+ break; |
+ case PP_VARTYPE_DOUBLE: |
+ DOUBLE_TO_NPVARIANT(var.value.as_double, *result); |
+ break; |
+ case PP_VARTYPE_STRING: { |
+ scoped_refptr<StringVar> string(StringVar::FromPPVar(var)); |
+ if (!string) { |
+ VOID_TO_NPVARIANT(*result); |
+ return false; |
+ } |
+ const std::string& value = string->value(); |
+ STRINGN_TO_NPVARIANT(value.c_str(), value.size(), *result); |
+ break; |
+ } |
+ case PP_VARTYPE_OBJECT: |
+ // Objects are not currently supported. |
+ VOID_TO_NPVARIANT(*result); |
+ DCHECK(false); |
+ return false; |
+ default: |
+ VOID_TO_NPVARIANT(*result); |
+ return false; |
+ } |
+ return true; |
+} |
+ |
+// Helper function to get the MessageChannel that is associated with an |
+// NPObject*. |
+MessageChannel& ToMessageChannel(NPObject* object) { |
+ return *(static_cast<MessageChannel::MessageChannelNPObject*>(object)-> |
+ message_channel); |
+} |
+ |
+//------------------------------------------------------------------------------ |
+// Implementations of NPClass functions. These are here to: |
+// - Implement postMessage behavior. |
+// - Forward calls to the 'passthrough' object to allow backwards-compatibility |
+// with GetInstanceObject() objects. |
+//------------------------------------------------------------------------------ |
+NPObject* MessageChannelAllocate(NPP npp, NPClass* the_class) { |
+ return new MessageChannel::MessageChannelNPObject; |
+} |
+ |
+void MessageChannelDeallocate(NPObject* object) { |
+ MessageChannel::MessageChannelNPObject* instance = |
+ static_cast<MessageChannel::MessageChannelNPObject*>(object); |
+ delete instance; |
+} |
+ |
+bool MessageChannelHasMethod(NPObject* np_obj, NPIdentifier name) { |
+ if (NULL == np_obj) |
+ return false; |
+ |
+ // We only handle a function called postMessage. |
+ if (IdentifierIsPostMessage(name)) |
brettw
2011/03/16 21:34:11
Can't you just compare identifiers? I thought that
|
+ return true; |
+ |
+ // Other method names we will pass to the passthrough object, if we have one. |
+ NPObject* passthrough = ToMessageChannel(np_obj).passthrough_object(); |
+ if (passthrough) { |
+ return WebBindings::hasMethod(NULL, passthrough, name); |
+ } |
+ return false; |
+} |
+ |
+bool MessageChannelInvoke(NPObject* np_obj, NPIdentifier name, |
+ const NPVariant* args, uint32 arg_count, |
+ NPVariant* result) { |
+ if (NULL == np_obj) |
+ return false; |
+ |
+ // We only handle a function called postMessage. |
+ if (IdentifierIsPostMessage(name) && (arg_count == 1)) { |
+ MessageChannel& message_channel(ToMessageChannel(np_obj)); |
+ PP_Var argument(Var::NPVariantToPPVar(message_channel.instance(), |
+ &args[0])); |
+ message_channel.PostMessageToNative(argument); |
+ return true; |
+ } |
+ // Other method calls we will pass to the passthrough object, if we have one. |
+ NPObject* passthrough = ToMessageChannel(np_obj).passthrough_object(); |
+ if (passthrough) { |
+ return WebBindings::invoke(NULL, passthrough, name, args, arg_count, |
+ result); |
+ } |
+ return false; |
+} |
+ |
+bool MessageChannelInvokeDefault(NPObject* np_obj, |
+ const NPVariant* args, |
+ uint32 arg_count, |
+ NPVariant* result) { |
+ if (NULL == np_obj) |
+ return false; |
+ |
+ // Invoke on the passthrough object, if we have one. |
+ NPObject* passthrough = ToMessageChannel(np_obj).passthrough_object(); |
+ if (passthrough) { |
+ return WebBindings::invokeDefault(NULL, passthrough, args, arg_count, |
+ result); |
+ } |
+ return false; |
+} |
+ |
+bool MessageChannelHasProperty(NPObject* np_obj, NPIdentifier name) { |
+ if (NULL == np_obj) |
+ return false; |
+ |
+ // Invoke on the passthrough object, if we have one. |
+ NPObject* passthrough = ToMessageChannel(np_obj).passthrough_object(); |
+ if (passthrough) { |
+ return WebBindings::hasProperty(NULL, passthrough, name); |
+ } |
+ return false; |
+} |
+ |
+bool MessageChannelGetProperty(NPObject* np_obj, NPIdentifier name, |
+ NPVariant* result) { |
+ if (NULL == np_obj) return false; |
+ |
+ // Don't allow getting the postMessage function. |
+ if (IdentifierIsPostMessage(name)) |
+ return false; |
+ |
+ // Invoke on the passthrough object, if we have one. |
+ NPObject* passthrough = ToMessageChannel(np_obj).passthrough_object(); |
+ if (passthrough) { |
+ return WebBindings::getProperty(NULL, passthrough, name, result); |
+ } |
+ return false; |
+} |
+ |
+bool MessageChannelSetProperty(NPObject* np_obj, NPIdentifier name, |
+ const NPVariant* variant) { |
+ if (NULL == np_obj) return false; |
+ |
+ // Don't allow setting the postMessage function. |
+ if (IdentifierIsPostMessage(name)) |
+ return false; |
+ |
+ // Invoke on the passthrough object, if we have one. |
+ NPObject* passthrough = ToMessageChannel(np_obj).passthrough_object(); |
+ if (passthrough) { |
+ return WebBindings::setProperty(NULL, passthrough, name, variant); |
+ } |
+ return false; |
+} |
+ |
+bool MessageChannelEnumerate(NPObject *np_obj, NPIdentifier **value, |
+ uint32_t *count) { |
+ if (NULL == np_obj) return false; |
+ |
+ // Invoke on the passthrough object, if we have one, to enumerate its |
+ // properties. |
+ NPObject* passthrough = ToMessageChannel(np_obj).passthrough_object(); |
+ if (passthrough) { |
+ bool success = WebBindings::enumerate(NULL, passthrough, value, count); |
+ if (success) { |
+ // add postMessage to the list and return it. |
+ NPIdentifier* new_array = static_cast<NPIdentifier*>( |
+ malloc(sizeof(NPIdentifier) * (*count + 1))); |
+ std::memcpy(new_array, *value, sizeof(NPIdentifier)*(*count)); |
+ new_array[*count] = WebBindings::getStringIdentifier(kPostMessage); |
+ free(*value); |
+ *value = new_array; |
+ ++(*count); |
+ return true; |
+ } |
+ } |
+ |
+ // Otherwise, build an array that includes only postMessage. |
+ *value = static_cast<NPIdentifier*>(malloc(sizeof(NPIdentifier))); |
+ (*value)[0] = WebBindings::getStringIdentifier(kPostMessage); |
+ *count = 1; |
+ return true; |
+} |
+ |
+NPClass message_channel_class = { |
+ NP_CLASS_STRUCT_VERSION, |
+ &MessageChannelAllocate, |
+ &MessageChannelDeallocate, |
+ NULL, |
+ &MessageChannelHasMethod, |
+ &MessageChannelInvoke, |
+ &MessageChannelInvokeDefault, |
+ &MessageChannelHasProperty, |
+ &MessageChannelGetProperty, |
+ &MessageChannelSetProperty, |
+ NULL, |
+ &MessageChannelEnumerate, |
+}; |
+} // namespace |
+ |
+// MessageChannel -------------------------------------------------------------- |
+MessageChannel::MessageChannelNPObject::MessageChannelNPObject() {} |
+ |
+MessageChannel::MessageChannelNPObject::~MessageChannelNPObject() {} |
+ |
+MessageChannel::MessageChannel(PluginInstance* instance) |
+ : instance_(instance), |
+ passthrough_object_(NULL), |
+ np_object_(NULL) { |
+ // Now create an NPObject for receiving calls to postMessage. |
+ NPObject* obj = WebBindings::createObject(NULL, &message_channel_class); |
+ DCHECK(obj != NULL); |
+ np_object_ = static_cast<MessageChannel::MessageChannelNPObject*>(obj); |
+ np_object_->message_channel = this; |
+} |
+ |
+void MessageChannel::PostMessageToJavaScript(PP_Var message_data) { |
+ // This is the javascript code that we invoke. It checks to see if onmessage |
+ // exists, and if so, it invokes it. |
+ const char invoke_onmessage_js[] = |
+ "(function(module_instance, message_data) {" |
+ " if (module_instance &&" // Only invoke if the instance is valid and |
+ " module_instance.onmessage &&" // has a function named onmessage. |
+ " typeof(module_instance.onmessage) == 'function') {" |
+ " var message_event = document.createEvent('MessageEvent');" |
+ " message_event.initMessageEvent('message'," // type |
+ " false," // canBubble |
+ " false," // cancelable |
+ " message_data," // data |
+ " ''," // origin |
+ " ''," // lastEventId |
+ " module_instance," // source |
+ " []);" // ports |
+ " module_instance.onmessage(message_event);" |
+ " }" |
+ "})"; |
+ |
+ NPString function_string = { invoke_onmessage_js, |
+ sizeof(invoke_onmessage_js)-1 }; |
+ NPVariant invoke_onmessage_js_function; |
+ VOID_TO_NPVARIANT(invoke_onmessage_js_function); |
+ // Get the current frame to pass to the evaluate function. |
+ WebKit::WebFrame* frame = |
+ instance_->container()->element().document().frame(); |
+ // Evaluate the function and obtain an NPVariant pointing to it. |
+ if (!WebBindings::evaluate(NULL, frame->windowObject(), &function_string, |
+ &invoke_onmessage_js_function)) { |
+ // If it fails, do nothing. |
+ return; |
+ } |
+ DCHECK(NPVARIANT_IS_OBJECT(invoke_onmessage_js_function)); |
+ DCHECK(instance_ != NULL); |
+ |
+ NPVariant result_var; |
+ VOID_TO_NPVARIANT(result_var); |
+ NPVariant npvariant_args[2]; |
+ OBJECT_TO_NPVARIANT(instance_->container()->scriptableObjectForElement(), |
+ npvariant_args[0]); |
+ // Convert message to an NPVariant without copying. Note this means that |
+ // in-process plugins will not copy the data, so isn't really following the |
+ // postMessage spec in spirit. Copying is handled in the proxy, and we don't |
+ // want to re-copy unnecessarily. |
+ // |
+ // TODO(dmichael): We need to do structured clone eventually to copy a object |
+ // structure. The details and PPAPI changes for this are TBD. |
+ if (!PPVarToNPVariantNoCopy(message_data, &npvariant_args[1])) { |
+ return; |
+ } |
+ WebBindings::invokeDefault(NULL, |
+ NPVARIANT_TO_OBJECT(invoke_onmessage_js_function), |
+ npvariant_args, |
+ sizeof(npvariant_args)/sizeof(*npvariant_args), |
+ &result_var); |
+ WebBindings::releaseVariantValue(&invoke_onmessage_js_function); |
+} |
+ |
+void MessageChannel::PostMessageToNative(PP_Var message_data) { |
+ instance_->HandleMessage(message_data); |
+} |
+ |
+MessageChannel::~MessageChannel() {} |
+ |
+} // namespace ppapi |
+} // namespace webkit |
+ |
Property changes on: webkit/plugins/ppapi/message_channel.cc |
___________________________________________________________________ |
Added: svn:eol-style |
+ LF |