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// Copyright 2018 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.
#ifndef IOS_WEB_JS_MESSAGING_WEB_FRAMES_MANAGER_IMPL_H_
#define IOS_WEB_JS_MESSAGING_WEB_FRAMES_MANAGER_IMPL_H_
#import "ios/web/public/js_messaging/web_frames_manager.h"
#import <WebKit/WebKit.h>
#include <map>
@class CRWWKScriptMessageRouter;
namespace web {
class WebState;
class WebFrame;
// Delegate for WebFramesManager to publish frame events and get WebState.
class WebFramesManagerDelegate {
public:
virtual ~WebFramesManagerDelegate() {}
// Will be invoked only once for each web frame in the page, when the frame is
// loaded and a WebFrame is added to the WebFramesManager.
virtual void OnWebFrameAvailable(WebFrame* frame) = 0;
// Will be invoked only once for each web frame in the page, when the frame is
// unloaed and before the WebFrame is removed from the WebFramesManager.
virtual void OnWebFrameUnavailable(WebFrame* frame) = 0;
virtual WebState* GetWebState() = 0;
};
class WebFramesManagerImpl : public WebFramesManager {
public:
explicit WebFramesManagerImpl(WebFramesManagerDelegate& delegate);
~WebFramesManagerImpl() override;
// Removes all web frames from the list of associated web frames.
void RemoveAllWebFrames();
// Broadcasts a (not encrypted) JavaScript message to get the identifiers
// and keys of existing frames.
void RegisterExistingFrames();
// Use |message_router| to unregister JS message handlers for |old_web_view|
// and register handlers for |new_web_view|. Owner of this class should call
// this method whenever associated WKWebView changes.
void OnWebViewUpdated(WKWebView* old_web_view,
WKWebView* new_web_view,
CRWWKScriptMessageRouter* message_router);
// WebFramesManager overrides.
std::set<WebFrame*> GetAllWebFrames() override;
WebFrame* GetMainWebFrame() override;
WebFrame* GetFrameWithId(const std::string& frame_id) override;
private:
// Adds |frame| to the list of web frames associated with WebState and invoke
// |delegate_|.OnWebFrameAvailable with |frame|. The frame must not be already
// in the frame manager (the frame manager must not have a frame with the same
// frame ID). If |frame| is a main frame, the frame manager must not have a
// main frame already.
void AddFrame(std::unique_ptr<WebFrame> frame);
// Removes the web frame with |frame_id|, if one exists, from the list of
// associated web frames, and invoke |delegate_|.OnWebFrameUnavailable with
// the web frame. If the frame manager does not contain a frame with
// |frame_id|, operation is a no-op.
void RemoveFrameWithId(const std::string& frame_id);
// Handles FrameBecameAvailable JS message and creates new WebFrame based on
// frame info from the message (e.g. ID, encryption key, message counter,
// etc.).
void OnFrameBecameAvailable(WKScriptMessage* message);
// Handles FrameBecameUnavailable JS message and removes the WebFrame with ID
// from the message.
void OnFrameBecameUnavailable(WKScriptMessage* message);
// List of pointers to all web frames associated with WebState.
std::map<std::string, std::unique_ptr<WebFrame>> web_frames_;
// Reference to the current main web frame.
WebFrame* main_web_frame_ = nullptr;
// Reference to the delegate.
WebFramesManagerDelegate& delegate_;
DISALLOW_COPY_AND_ASSIGN(WebFramesManagerImpl);
};
} // namespace web
#endif // IOS_WEB_WEB_STATE_WEB_FRAMES_MANAGER_H_