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// Copyright (c) 2012 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/extensions/webstore_bindings.h"
#include "base/strings/string_util.h"
#include "chrome/common/extensions/extension_constants.h"
#include "chrome/renderer/extensions/chrome_v8_context.h"
#include "content/public/renderer/render_view.h"
#include "extensions/common/extension.h"
#include "extensions/common/extension_messages.h"
#include "grit/renderer_resources.h"
#include "third_party/WebKit/public/web/WebDocument.h"
#include "third_party/WebKit/public/web/WebElement.h"
#include "third_party/WebKit/public/web/WebNode.h"
#include "third_party/WebKit/public/web/WebNodeList.h"
#include "third_party/WebKit/public/web/WebUserGestureIndicator.h"
#include "url/gurl.h"
#include "v8/include/v8.h"
using blink::WebDocument;
using blink::WebElement;
using blink::WebFrame;
using blink::WebNode;
using blink::WebNodeList;
using blink::WebUserGestureIndicator;
namespace extensions {
namespace {
const char kWebstoreLinkRelation[] = "chrome-webstore-item";
const char kPreferredStoreLinkUrlNotAString[] =
"The Chrome Web Store item link URL parameter must be a string.";
const char kSuccessCallbackNotAFunctionError[] =
"The success callback parameter must be a function.";
const char kFailureCallbackNotAFunctionError[] =
"The failure callback parameter must be a function.";
const char kNotInTopFrameError[] =
"Chrome Web Store installations can only be started by the top frame.";
const char kNotUserGestureError[] =
"Chrome Web Store installations can only be initated by a user gesture.";
const char kNoWebstoreItemLinkFoundError[] =
"No Chrome Web Store item link found.";
const char kInvalidWebstoreItemUrlError[] =
"Invalid Chrome Web Store item URL.";
// chrome.webstore.install() calls generate an install ID so that the install's
// callbacks may be fired when the browser notifies us of install completion
// (successful or not) via OnInlineWebstoreInstallResponse.
int g_next_install_id = 0;
} // anonymous namespace
WebstoreBindings::WebstoreBindings(Dispatcher* dispatcher,
ChromeV8Context* context)
: ChromeV8Extension(dispatcher, context),
ChromeV8ExtensionHandler(context) {
RouteFunction("Install",
base::Bind(&WebstoreBindings::Install, base::Unretained(this)));
}
void WebstoreBindings::Install(
const v8::FunctionCallbackInfo<v8::Value>& args) {
WebFrame* frame = WebFrame::frameForContext(context()->v8_context());
if (!frame || !frame->view())
return;
content::RenderView* render_view =
content::RenderView::FromWebView(frame->view());
if (!render_view)
return;
std::string preferred_store_link_url;
if (!args[0]->IsUndefined()) {
if (args[0]->IsString()) {
preferred_store_link_url = std::string(*v8::String::Utf8Value(args[0]));
} else {
args.GetIsolate()->ThrowException(v8::String::NewFromUtf8(
args.GetIsolate(), kPreferredStoreLinkUrlNotAString));
return;
}
}
std::string webstore_item_id;
std::string error;
if (!GetWebstoreItemIdFromFrame(
frame, preferred_store_link_url, &webstore_item_id, &error)) {
args.GetIsolate()->ThrowException(
v8::String::NewFromUtf8(args.GetIsolate(), error.c_str()));
return;
}
int install_id = g_next_install_id++;
if (!args[1]->IsUndefined() && !args[1]->IsFunction()) {
args.GetIsolate()->ThrowException(v8::String::NewFromUtf8(
args.GetIsolate(), kSuccessCallbackNotAFunctionError));
return;
}
if (!args[2]->IsUndefined() && !args[2]->IsFunction()) {
args.GetIsolate()->ThrowException(v8::String::NewFromUtf8(
args.GetIsolate(), kFailureCallbackNotAFunctionError));
return;
}
Send(new ExtensionHostMsg_InlineWebstoreInstall(
render_view->GetRoutingID(),
install_id,
GetRoutingID(),
webstore_item_id,
frame->document().url()));
args.GetReturnValue().Set(static_cast<int32_t>(install_id));
}
// static
bool WebstoreBindings::GetWebstoreItemIdFromFrame(
WebFrame* frame, const std::string& preferred_store_link_url,
std::string* webstore_item_id, std::string* error) {
if (frame != frame->top()) {
*error = kNotInTopFrameError;
return false;
}
if (!WebUserGestureIndicator::isProcessingUserGesture()) {
*error = kNotUserGestureError;
return false;
}
WebDocument document = frame->document();
if (document.isNull()) {
*error = kNoWebstoreItemLinkFoundError;
return false;
}
WebElement head = document.head();
if (head.isNull()) {
*error = kNoWebstoreItemLinkFoundError;
return false;
}
GURL webstore_base_url =
GURL(extension_urls::GetWebstoreItemDetailURLPrefix());
WebNodeList children = head.childNodes();
for (unsigned i = 0; i < children.length(); ++i) {
WebNode child = children.item(i);
if (!child.isElementNode())
continue;
WebElement elem = child.to<WebElement>();
if (!elem.hasTagName("link") || !elem.hasAttribute("rel") ||
!elem.hasAttribute("href"))
continue;
std::string rel = elem.getAttribute("rel").utf8();
if (!LowerCaseEqualsASCII(rel, kWebstoreLinkRelation))
continue;
std::string webstore_url_string(elem.getAttribute("href").utf8());
if (!preferred_store_link_url.empty() &&
preferred_store_link_url != webstore_url_string) {
continue;
}
GURL webstore_url = GURL(webstore_url_string);
if (!webstore_url.is_valid()) {
*error = kInvalidWebstoreItemUrlError;
return false;
}
if (webstore_url.scheme() != webstore_base_url.scheme() ||
webstore_url.host() != webstore_base_url.host() ||
!StartsWithASCII(
webstore_url.path(), webstore_base_url.path(), true)) {
*error = kInvalidWebstoreItemUrlError;
return false;
}
std::string candidate_webstore_item_id = webstore_url.path().substr(
webstore_base_url.path().length());
if (!extensions::Extension::IdIsValid(candidate_webstore_item_id)) {
*error = kInvalidWebstoreItemUrlError;
return false;
}
std::string reconstructed_webstore_item_url_string =
extension_urls::GetWebstoreItemDetailURLPrefix() +
candidate_webstore_item_id;
if (reconstructed_webstore_item_url_string != webstore_url_string) {
*error = kInvalidWebstoreItemUrlError;
return false;
}
*webstore_item_id = candidate_webstore_item_id;
return true;
}
*error = kNoWebstoreItemLinkFoundError;
return false;
}
bool WebstoreBindings::OnMessageReceived(const IPC::Message& message) {
IPC_BEGIN_MESSAGE_MAP(WebstoreBindings, message)
IPC_MESSAGE_HANDLER(ExtensionMsg_InlineWebstoreInstallResponse,
OnInlineWebstoreInstallResponse)
IPC_MESSAGE_UNHANDLED(CHECK(false) << "Unhandled IPC message")
IPC_END_MESSAGE_MAP()
return true;
}
void WebstoreBindings::OnInlineWebstoreInstallResponse(
int install_id,
bool success,
const std::string& error) {
v8::Isolate* isolate = context()->isolate();
v8::HandleScope handle_scope(isolate);
v8::Context::Scope context_scope(context()->v8_context());
v8::Handle<v8::Value> argv[] = {
v8::Integer::New(isolate, install_id),
v8::Boolean::New(isolate, success),
v8::String::NewFromUtf8(isolate, error.c_str())
};
context()->module_system()->CallModuleMethod(
"webstore", "onInstallResponse", arraysize(argv), argv);
}
} // namespace extensions
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