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// Copyright 2023 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_SAFE_BROWSING_CONTENT_RENDERER_PHISHING_CLASSIFIER_PHISHING_IMAGE_EMBEDDER_H_
#define COMPONENTS_SAFE_BROWSING_CONTENT_RENDERER_PHISHING_CLASSIFIER_PHISHING_IMAGE_EMBEDDER_H_
#include <memory>
#include "base/functional/callback.h"
#include "base/memory/raw_ptr.h"
#include "base/memory/weak_ptr.h"
#include "components/safe_browsing/content/renderer/phishing_classifier/phishing_visual_feature_extractor.h"
#include "components/safe_browsing/content/renderer/phishing_classifier/scorer.h"
#include "third_party/skia/include/core/SkBitmap.h"
namespace content {
class RenderFrame;
}
namespace safe_browsing {
class ImageFeatureEmbedding;
class PhishingVisualFeatureExtractor;
// This class handles the process of extracting visual features from a page and
// using that to compute a feature vector provided by third party TfLite library
// image_embedder.h
class PhishingImageEmbedder {
public:
using DoneCallback =
base::OnceCallback<void(const ImageFeatureEmbedding& /* verdict */)>;
explicit PhishingImageEmbedder(content::RenderFrame* render_frame);
PhishingImageEmbedder(const PhishingImageEmbedder&) = delete;
PhishingImageEmbedder& operator=(const PhishingImageEmbedder&) = delete;
virtual ~PhishingImageEmbedder();
// Returns true if the image embedder is ready to embed pages, i.e. it
// has had a scorer set via set_phishing_scorer().
bool is_ready() const;
// Called by the RenderView when a page has finished loading. This begins the
// feature extraction used to ultimately create a FrameBuffer object to be
// used with the ImageEmbedder under the scorer to produce a 1-D feature
// vector that is to be appended to the ImageFeatureEmbedding message that
// is passed back to the browser to be added to the CSPP ping.
virtual void BeginImageEmbedding(DoneCallback callback);
// Called by the RenderView (on the render thread) when a page is unloading or
// the RenderView is being destroyed. This cancels any visual feature
// extraction that is occurring. It is an error if this is called while the
// image embedder is not ready.
virtual void CancelPendingImageEmbedding();
private:
// Callback when off-thread playback of the recorded paint operations is
// complete.
void OnPlaybackDone(std::unique_ptr<SkBitmap> bitmap);
// Callback when the image embedding feature vector has been added to the
// verdict.
void OnImageEmbeddingDone(ImageFeatureEmbedding image_feature_embedding);
// Helper method to run the Image Embedding process' DoneCallback and clear
// the state.
void RunCallback(const ImageFeatureEmbedding& image_feature_embedding);
// Helper to run the DoneCallback when the visual extraction has failed. This
// will always send an empty ImageFeatureEmbedding object.
void RunFailureCallback();
// Clears the current state of the ImageEmbedder.
void Clear();
raw_ptr<content::RenderFrame> render_frame_; // owns us.
std::unique_ptr<PhishingVisualFeatureExtractor> visual_extractor_;
// State for any in-progress image embedding extraction.
std::unique_ptr<SkBitmap> bitmap_;
DoneCallback done_callback_;
// Used in scheduling BeginFeatureExtraction tasks.
// These pointers are invalidated if image embedding is cancelled.
base::WeakPtrFactory<PhishingImageEmbedder> weak_factory_{this};
};
} // namespace safe_browsing
#endif // COMPONENTS_SAFE_BROWSING_CONTENT_RENDERER_PHISHING_CLASSIFIER_PHISHING_IMAGE_EMBEDDER_H_
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