src/libcef/renderer/blink_glue.cc

// Copyright (c) 2012 The Chromium Embedded Framework Authors.
// Portions 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 "libcef/renderer/blink_glue.h"

#include "third_party/blink/public/mojom/v8_cache_options.mojom-blink.h"
#include "third_party/blink/public/platform/web_string.h"
#include "third_party/blink/public/platform/web_url_response.h"
#include "third_party/blink/public/web/web_document.h"
#include "third_party/blink/public/web/web_element.h"
#include "third_party/blink/public/web/web_local_frame_client.h"
#include "third_party/blink/public/web/web_node.h"
#include "third_party/blink/public/web/web_view_client.h"

#include "third_party/blink/renderer/bindings/core/v8/sanitize_script_errors.h"
#include "third_party/blink/renderer/bindings/core/v8/script_evaluation_result.h"
#include "third_party/blink/renderer/bindings/core/v8/v8_binding_for_core.h"
#include "third_party/blink/renderer/core/dom/document.h"
#include "third_party/blink/renderer/core/dom/element.h"
#include "third_party/blink/renderer/core/dom/node.h"
#include "third_party/blink/renderer/core/editing/serializers/serialization.h"
#include "third_party/blink/renderer/core/execution_context/execution_context.h"
#include "third_party/blink/renderer/core/execution_context/execution_context_lifecycle_state_observer.h"
#include "third_party/blink/renderer/core/exported/web_view_impl.h"
#include "third_party/blink/renderer/core/frame/frame_owner.h"
#include "third_party/blink/renderer/core/frame/local_dom_window.h"
#include "third_party/blink/renderer/core/frame/local_frame.h"
#include "third_party/blink/renderer/core/frame/settings.h"
#include "third_party/blink/renderer/core/frame/web_local_frame_impl.h"
#include "third_party/blink/renderer/core/loader/frame_load_request.h"
#include "third_party/blink/renderer/core/page/page.h"
#include "third_party/blink/renderer/core/script/classic_script.h"
#include "third_party/blink/renderer/platform/bindings/script_forbidden_scope.h"
#include "third_party/blink/renderer/platform/bindings/v8_binding.h"
#include "third_party/blink/renderer/platform/loader/fetch/resource_response.h"
#include "third_party/blink/renderer/platform/loader/fetch/script_fetch_options.h"
#include "third_party/blink/renderer/platform/weborigin/scheme_registry.h"
#undef LOG

#include "base/logging.h"

namespace blink_glue {

namespace {

blink::ExecutionContext* GetExecutionContext(v8::Local<v8::Context> context) {
  blink::LocalFrame* frame = blink::ToLocalFrameIfNotDetached(context);
  if (frame &&
      frame->DomWindow()->CanExecuteScripts(blink::kAboutToExecuteScript)) {
    return frame->GetDocument()->GetExecutionContext();
  }
  return nullptr;
}

}  // namespace

const int64_t kInvalidFrameId = -1;

bool CanGoBack(blink::WebView* view) {
  if (!view) {
    return false;
  }
  return view->HistoryBackListCount() > 0;
}

bool CanGoForward(blink::WebView* view) {
  if (!view) {
    return false;
  }
  return view->HistoryForwardListCount() > 0;
}

void GoBack(blink::WebView* view) {
  if (!view) {
    return;
  }

  blink::WebFrame* main_frame = view->MainFrame();
  if (main_frame && main_frame->IsWebLocalFrame()) {
    if (view->HistoryBackListCount() > 0) {
      blink::Frame* core_frame = blink::WebFrame::ToCoreFrame(*main_frame);
      blink::To<blink::LocalFrame>(core_frame)
          ->GetLocalFrameHostRemote()
          .GoToEntryAtOffset(-1, /*has_user_gesture=*/true, absl::nullopt);
    }
  }
}

void GoForward(blink::WebView* view) {
  if (!view) {
    return;
  }

  blink::WebFrame* main_frame = view->MainFrame();
  if (main_frame && main_frame->IsWebLocalFrame()) {
    if (view->HistoryForwardListCount() > 0) {
      blink::Frame* core_frame = blink::WebFrame::ToCoreFrame(*main_frame);
      blink::To<blink::LocalFrame>(core_frame)
          ->GetLocalFrameHostRemote()
          .GoToEntryAtOffset(1, /*has_user_gesture=*/true, absl::nullopt);
    }
  }
}

bool IsInBackForwardCache(blink::WebLocalFrame* frame) {
  blink::Frame* core_frame = blink::WebFrame::ToCoreFrame(*frame);
  return blink::To<blink::LocalFrame>(core_frame)
      ->GetPage()
      ->GetPageScheduler()
      ->IsInBackForwardCache();
}

blink::WebString DumpDocumentText(blink::WebLocalFrame* frame) {
  // We use the document element's text instead of the body text here because
  // not all documents have a body, such as XML documents.
  blink::WebElement document_element = frame->GetDocument().DocumentElement();
  if (document_element.IsNull()) {
    return blink::WebString();
  }

  blink::Element* web_element = document_element.Unwrap<blink::Element>();
  return blink::WebString(web_element->innerText());
}

blink::WebString DumpDocumentMarkup(blink::WebLocalFrame* frame) {
  return blink::CreateMarkup(
      blink::To<blink::WebLocalFrameImpl>(frame)->GetFrame()->GetDocument());
}

cef_dom_node_type_t GetNodeType(const blink::WebNode& node) {
  const blink::Node* web_node = node.ConstUnwrap<blink::Node>();
  switch (web_node->getNodeType()) {
    case blink::Node::kElementNode:
      return DOM_NODE_TYPE_ELEMENT;
    case blink::Node::kAttributeNode:
      return DOM_NODE_TYPE_ATTRIBUTE;
    case blink::Node::kTextNode:
      return DOM_NODE_TYPE_TEXT;
    case blink::Node::kCdataSectionNode:
      return DOM_NODE_TYPE_CDATA_SECTION;
    case blink::Node::kProcessingInstructionNode:
      return DOM_NODE_TYPE_PROCESSING_INSTRUCTIONS;
    case blink::Node::kCommentNode:
      return DOM_NODE_TYPE_COMMENT;
    case blink::Node::kDocumentNode:
      return DOM_NODE_TYPE_DOCUMENT;
    case blink::Node::kDocumentTypeNode:
      return DOM_NODE_TYPE_DOCUMENT_TYPE;
    case blink::Node::kDocumentFragmentNode:
      return DOM_NODE_TYPE_DOCUMENT_FRAGMENT;
  }
  return DOM_NODE_TYPE_UNSUPPORTED;
}

blink::WebString GetNodeName(const blink::WebNode& node) {
  const blink::Node* web_node = node.ConstUnwrap<blink::Node>();
  return web_node->nodeName();
}

blink::WebString CreateNodeMarkup(const blink::WebNode& node) {
  const blink::Node* web_node = node.ConstUnwrap<blink::Node>();
  return blink::CreateMarkup(web_node);
}

bool SetNodeValue(blink::WebNode& node, const blink::WebString& value) {
  blink::Node* web_node = node.Unwrap<blink::Node>();
  web_node->setNodeValue(value);
  return true;
}

v8::MaybeLocal<v8::Value> CallV8Function(v8::Local<v8::Context> context,
                                         v8::Local<v8::Function> function,
                                         v8::Local<v8::Object> receiver,
                                         int argc,
                                         v8::Local<v8::Value> args[],
                                         v8::Isolate* isolate) {
  v8::MaybeLocal<v8::Value> func_rv;

  // Execute the function call using the V8ScriptRunner so that inspector
  // instrumentation works.
  if (auto execution_context = GetExecutionContext(context)) {
    func_rv = blink::V8ScriptRunner::CallFunction(
        function, execution_context, receiver, argc, args, isolate);
  }

  return func_rv;
}

bool IsTextControlElement(const blink::WebElement& element) {
  const blink::Element* web_element = element.ConstUnwrap<blink::Element>();
  return web_element->IsTextControl();
}

v8::Local<v8::Value> ExecuteV8ScriptAndReturnValue(
    const blink::WebString& source,
    const blink::WebString& source_url,
    int start_line,
    v8::Local<v8::Context> context,
    v8::TryCatch& tryCatch) {
  if (start_line < 1) {
    start_line = 1;
  }

  blink::LocalFrame* frame = blink::ToLocalFrameIfNotDetached(context);
  if (!frame) {
    return v8::Local<v8::Value>();
  }

  auto* script = blink::ClassicScript::Create(
      source, blink::KURL(source_url), blink::KURL(source_url),
      blink::ScriptFetchOptions(), blink::ScriptSourceLocationType::kInternal,
      blink::SanitizeScriptErrors::kDoNotSanitize, /*cache_handler=*/nullptr,
      WTF::TextPosition(WTF::OrdinalNumber::FromOneBasedInt(start_line),
                        WTF::OrdinalNumber::FromZeroBasedInt(0)));

  // The Rethrow() message is unused due to kDoNotSanitize but it still needs
  // to be non-nullopt for exceptions to be re-thrown as expected.
  auto result = blink::V8ScriptRunner::CompileAndRunScript(
      blink::ScriptState::From(context), script,
      blink::ExecuteScriptPolicy::kExecuteScriptWhenScriptsDisabled,
      blink::V8ScriptRunner::RethrowErrorsOption::Rethrow(""));

  if (result.GetResultType() ==
      blink::ScriptEvaluationResult::ResultType::kSuccess) {
    return result.GetSuccessValue();
  }

  DCHECK(tryCatch.HasCaught());
  return v8::Local<v8::Value>();
}

v8::MicrotaskQueue* GetMicrotaskQueue(v8::Local<v8::Context> context) {
  if (auto execution_context = GetExecutionContext(context)) {
    return execution_context->GetMicrotaskQueue();
  }
  return nullptr;
}

bool IsScriptForbidden() {
  return blink::ScriptForbiddenScope::IsScriptForbidden();
}

std::unique_ptr<CefObserverRegistration>
RegisterExecutionContextLifecycleStateObserver(
    v8::Local<v8::Context> context,
    CefExecutionContextLifecycleStateObserver* observer) {
  class Observer : public blink::GarbageCollected<Observer>,
                   public blink::ExecutionContextLifecycleStateObserver {
   public:
    Observer(blink::ExecutionContext* execution_context,
             CefExecutionContextLifecycleStateObserver* observer)
        : blink::ExecutionContextLifecycleStateObserver(execution_context),
          observer_(observer) {
      UpdateStateIfNeeded();
    }

    void ContextLifecycleStateChanged(
        blink::mojom::blink::FrameLifecycleState state) override {
      observer_->ContextLifecycleStateChanged(state);
    }

    void ContextDestroyed() override {}

   private:
    CefExecutionContextLifecycleStateObserver* observer_;
  };

  class Registration : public CefObserverRegistration {
   public:
    Registration(blink::Persistent<Observer> observer) : observer_(observer) {}

   private:
    blink::Persistent<Observer> observer_;
  };

  return std::make_unique<Registration>(blink::MakeGarbageCollected<Observer>(
      blink::ExecutionContext::From(context), observer));
}

void RegisterURLSchemeAsSupportingFetchAPI(const blink::WebString& scheme) {
  blink::SchemeRegistry::RegisterURLSchemeAsSupportingFetchAPI(scheme);
}

struct CefScriptForbiddenScope::Impl {
  blink::ScriptForbiddenScope scope_;
};

CefScriptForbiddenScope::CefScriptForbiddenScope() : impl_(new Impl()) {}

CefScriptForbiddenScope::~CefScriptForbiddenScope() {}

bool ResponseWasCached(const blink::WebURLResponse& response) {
  return response.ToResourceResponse().WasCached();
}

bool HasPluginFrameOwner(blink::WebLocalFrame* frame) {
  blink::Frame* core_frame = blink::WebFrame::ToCoreFrame(*frame);
  return core_frame->Owner() && core_frame->Owner()->IsPlugin();
}

// Based on WebLocalFrameImpl::StartNavigation which was removed in
// https://crrev.com/de4fc2a5fe.
void StartNavigation(blink::WebLocalFrame* frame,
                     const blink::WebURLRequest& request) {
  DCHECK(!request.IsNull());
  DCHECK(!request.Url().ProtocolIs("javascript"));

  blink::FrameLoadRequest frame_load_request(nullptr,
                                             request.ToResourceRequest());
  blink::Frame* core_frame = blink::WebFrame::ToCoreFrame(*frame);
  blink::To<blink::LocalFrame>(core_frame)
      ->Loader()
      .StartNavigation(frame_load_request, blink::WebFrameLoadType::kStandard);
}

}  // namespace blink_glue