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// Copyright 2014 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 EXTENSIONS_BROWSER_CONTENT_HASH_FETCHER_H_
#define EXTENSIONS_BROWSER_CONTENT_HASH_FETCHER_H_
#include "base/memory/weak_ptr.h"
#include "base/scoped_observer.h"
#include "extensions/browser/content_verifier_delegate.h"
#include "extensions/browser/extension_registry_observer.h"
#include "extensions/common/extension.h"
namespace content {
class BrowserContext;
}
namespace extensions {
class ExtensionRegistry;
class ContentHashFetcherJob;
// This class is responsible for getting signed expected hashes for use in
// extension content verification. As extensions are loaded it will fetch and
// parse/validate/cache this data as needed, including calculating expected
// hashes for each block of each file within an extension. (These unsigned leaf
// node block level hashes will always be checked at time of use use to make
// sure they match the signed treehash root hash).
class ContentHashFetcher : public ExtensionRegistryObserver {
public:
// The consumer of this class needs to ensure that context and delegate
// outlive this object.
ContentHashFetcher(content::BrowserContext* context,
ContentVerifierDelegate* delegate);
virtual ~ContentHashFetcher();
// Begins the process of trying to fetch any needed verified contents, and
// listening for extension load/unload.
void Start();
// Explicitly ask to fetch hashes for |extension|.
void DoFetch(const Extension* extension);
// ExtensionRegistryObserver interface
virtual void OnExtensionLoaded(content::BrowserContext* browser_context,
const Extension* extension) OVERRIDE;
virtual void OnExtensionUnloaded(
content::BrowserContext* browser_context,
const Extension* extension,
UnloadedExtensionInfo::Reason reason) OVERRIDE;
private:
// Callback for when a job getting content hashes has completed.
void JobFinished(ContentHashFetcherJob* job);
content::BrowserContext* context_;
ContentVerifierDelegate* delegate_;
// We keep around pointers to in-progress jobs, both so we can avoid
// scheduling duplicate work if fetching is already in progress, and so that
// we can cancel in-progress work at shutdown time.
typedef std::pair<ExtensionId, std::string> IdAndVersion;
typedef std::map<IdAndVersion, scoped_refptr<ContentHashFetcherJob> > JobMap;
JobMap jobs_;
// For observing the ExtensionRegistry.
ScopedObserver<ExtensionRegistry, ExtensionRegistryObserver> observer_;
// Used for binding callbacks passed to jobs.
base::WeakPtrFactory<ContentHashFetcher> weak_ptr_factory_;
DISALLOW_COPY_AND_ASSIGN(ContentHashFetcher);
};
} // namespace extensions
#endif // EXTENSIONS_BROWSER_CONTENT_HASH_FETCHER_H_
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