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// Copyright 2015 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 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 <vector>
#include "base/callback.h"
#include "base/containers/hash_tables.h"
#include "base/macros.h"
#include "base/memory/linked_ptr.h"
#include "chrome/browser/extensions/api/declarative_content/content_predicate_evaluator.h"
#include "content/public/browser/notification_observer.h"
#include "content/public/browser/notification_registrar.h"
#include "content/public/browser/web_contents_observer.h"
namespace base {
class Value;
}
namespace content {
struct FrameNavigateParams;
struct LoadCommittedDetails;
class RenderProcessHost;
class WebContents;
}
namespace extensions {
class Extension;
// Tests whether all the specified CSS selectors match on the page.
class DeclarativeContentCssPredicate : public ContentPredicate {
public:
~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.
ContentPredicateEvaluator* const evaluator_;
std::vector<std::string> css_selectors_;
DISALLOW_COPY_AND_ASSIGN(DeclarativeContentCssPredicate);
};
// 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::NotificationObserver {
public:
explicit DeclarativeContentCssConditionTracker(Delegate* delegate);
~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,
const content::LoadCommittedDetails& details,
const content::FrameNavigateParams& params) 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::Callback<void(content::WebContents*)>;
using WebContentsDestroyedCallback =
base::Callback<void(content::WebContents*)>;
PerWebContentsTracker(
content::WebContents* contents,
const RequestEvaluationCallback& request_evaluation,
const WebContentsDestroyedCallback& web_contents_destroyed);
~PerWebContentsTracker() override;
void OnWebContentsNavigation(const content::LoadCommittedDetails& details,
const content::FrameNavigateParams& params);
const base::hash_set<std::string>& matching_css_selectors() const {
return matching_css_selectors_;
}
private:
// content::WebContentsObserver overrides.
bool OnMessageReceived(const IPC::Message& message) override;
void WebContentsDestroyed() override;
void OnWatchedPageChange(const std::vector<std::string>& css_selectors);
const RequestEvaluationCallback request_evaluation_;
const WebContentsDestroyedCallback web_contents_destroyed_;
// We use a hash_set for maximally efficient lookup.
base::hash_set<std::string> matching_css_selectors_;
DISALLOW_COPY_AND_ASSIGN(PerWebContentsTracker);
};
// content::NotificationObserver implementation.
void Observe(int type,
const content::NotificationSource& source,
const content::NotificationDetails& details) 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 an ExtensionMsg_WatchPages.
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.
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<const DeclarativeContentCssPredicate*>>
tracked_predicates_;
// Maps WebContents to the tracker for that WebContents state.
std::map<content::WebContents*, linked_ptr<PerWebContentsTracker>>
per_web_contents_tracker_;
// Manages our notification registrations.
content::NotificationRegistrar registrar_;
DISALLOW_COPY_AND_ASSIGN(DeclarativeContentCssConditionTracker);
};
} // namespace extensions
#endif // CHROME_BROWSER_EXTENSIONS_API_DECLARATIVE_CONTENT_DECLARATIVE_CONTENT_CSS_CONDITION_TRACKER_H_
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