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// Copyright 2015 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_EXTENSIONS_API_DECLARATIVE_CONTENT_DECLARATIVE_CONTENT_CSS_CONDITION_TRACKER_H_
#define CHROME_BROWSER_EXTENSIONS_API_DECLARATIVE_CONTENT_DECLARATIVE_CONTENT_CSS_CONDITION_TRACKER_H_
#include <map>
#include <memory>
#include <set>
#include <string>
#include <unordered_set>
#include <vector>
#include "base/functional/callback.h"
#include "base/memory/raw_ptr.h"
#include "chrome/browser/extensions/api/declarative_content/content_predicate_evaluator.h"
#include "content/public/browser/render_process_host_creation_observer.h"
#include "content/public/browser/web_contents_observer.h"
namespace base {
class Value;
}
namespace extensions {
class Extension;
// Tests whether all the specified CSS selectors match on the page.
class DeclarativeContentCssPredicate : public ContentPredicate {
public:
DeclarativeContentCssPredicate(const DeclarativeContentCssPredicate&) =
delete;
DeclarativeContentCssPredicate& operator=(
const DeclarativeContentCssPredicate&) = delete;
~DeclarativeContentCssPredicate() override;
const std::vector<std::string>& css_selectors() const {
return css_selectors_;
}
static std::unique_ptr<DeclarativeContentCssPredicate> Create(
ContentPredicateEvaluator* evaluator,
const base::Value& value,
std::string* error);
// ContentPredicate:
ContentPredicateEvaluator* GetEvaluator() const override;
private:
DeclarativeContentCssPredicate(ContentPredicateEvaluator* evaluator,
const std::vector<std::string>& css_selectors);
// Weak.
const raw_ptr<ContentPredicateEvaluator, DanglingUntriaged> evaluator_;
std::vector<std::string> css_selectors_;
};
// Supports watching of CSS selectors to across tab contents in a browser
// context, and querying for the matching CSS selectors for a context.
class DeclarativeContentCssConditionTracker
: public ContentPredicateEvaluator,
public content::RenderProcessHostCreationObserver {
public:
explicit DeclarativeContentCssConditionTracker(Delegate* delegate);
DeclarativeContentCssConditionTracker(
const DeclarativeContentCssConditionTracker&) = delete;
DeclarativeContentCssConditionTracker& operator=(
const DeclarativeContentCssConditionTracker&) = delete;
~DeclarativeContentCssConditionTracker() override;
// ContentPredicateEvaluator:
std::string GetPredicateApiAttributeName() const override;
std::unique_ptr<const ContentPredicate> CreatePredicate(
const Extension* extension,
const base::Value& value,
std::string* error) override;
void TrackPredicates(
const std::map<const void*, std::vector<const ContentPredicate*>>&
predicates) override;
void StopTrackingPredicates(
const std::vector<const void*>& predicate_groups) override;
void TrackForWebContents(content::WebContents* contents) override;
void OnWebContentsNavigation(
content::WebContents* contents,
content::NavigationHandle* navigation_handle) override;
void OnWatchedPageChanged(
content::WebContents* contents,
const std::vector<std::string>& css_selectors) override;
bool EvaluatePredicate(const ContentPredicate* predicate,
content::WebContents* tab) const override;
private:
// Monitors CSS selector matching state on one WebContents.
class PerWebContentsTracker : public content::WebContentsObserver {
public:
using RequestEvaluationCallback =
base::RepeatingCallback<void(content::WebContents*)>;
using WebContentsDestroyedCallback =
base::OnceCallback<void(content::WebContents*)>;
PerWebContentsTracker(content::WebContents* contents,
RequestEvaluationCallback request_evaluation,
WebContentsDestroyedCallback web_contents_destroyed);
PerWebContentsTracker(const PerWebContentsTracker&) = delete;
PerWebContentsTracker& operator=(const PerWebContentsTracker&) = delete;
~PerWebContentsTracker() override;
void OnWebContentsNavigation(content::NavigationHandle* navigation_handle);
void OnWatchedPageChanged(const std::vector<std::string>& css_selectors);
const std::unordered_set<std::string>& matching_css_selectors() const {
return matching_css_selectors_;
}
private:
// content::WebContentsObserver overrides.
void WebContentsDestroyed() override;
const RequestEvaluationCallback request_evaluation_;
WebContentsDestroyedCallback web_contents_destroyed_;
// We use a hash_set for maximally efficient lookup.
std::unordered_set<std::string> matching_css_selectors_;
};
// content::RenderProcessHostCreationObserver implementation.
void OnRenderProcessHostCreated(content::RenderProcessHost* host) override;
// Informs renderer processes of a new set of watched CSS selectors.
void UpdateRenderersWatchedCssSelectors(
const std::vector<std::string>& watched_css_selectors);
// Returns the current list of watched CSS selectors.
std::vector<std::string> GetWatchedCssSelectors() const;
// If the renderer process is associated with our browser context, tells it
// what page attributes to watch for using the WatchPages Mojo method.
void InstructRenderProcessIfManagingBrowserContext(
content::RenderProcessHost* process,
std::vector<std::string> watched_css_selectors);
// Called by PerWebContentsTracker on web contents destruction.
void DeletePerWebContentsTracker(content::WebContents* contents);
// Weak.
raw_ptr<Delegate> delegate_;
// Maps the CSS selectors to watch to the number of predicates specifying
// them.
std::map<std::string, int> watched_css_selector_predicate_count_;
// Grouped predicates tracked by this object.
std::map<const void*,
std::vector<raw_ptr<const DeclarativeContentCssPredicate,
VectorExperimental>>>
tracked_predicates_;
// Maps WebContents to the tracker for that WebContents state.
std::map<content::WebContents*, std::unique_ptr<PerWebContentsTracker>>
per_web_contents_tracker_;
};
} // namespace extensions
#endif // CHROME_BROWSER_EXTENSIONS_API_DECLARATIVE_CONTENT_DECLARATIVE_CONTENT_CSS_CONDITION_TRACKER_H_
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