The optional Malware Details also collects HTTP cache information. See design...

chrome/browser/safe_browsing/malware_details_cache.h

+// Copyright (c) 2011 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_SAFE_BROWSING_MALWARE_DETAILS_CACHE_H_
+#define CHROME_BROWSER_SAFE_BROWSING_MALWARE_DETAILS_CACHE_H_
+#pragma once
+
+// A class that gets malware details from the HTTP Cache.
+
+// An instance of this class is generated by MalwareDetails.
+
+#include <string>
+#include <vector>
+
+#include "base/hash_tables.h"
+#include "base/memory/linked_ptr.h"
+#include "base/memory/ref_counted.h"
+#include "chrome/browser/safe_browsing/report.pb.h"
+#include "net/base/completion_callback.h"
+
+namespace disk_cache {
+class Backend;
+class Entry;
+}
+namespace net {
+class IOBuffer;
+class URLRequestContext;
+}
+
+class MalwareDetailsFactory;
+
+namespace safe_browsing {
+
+// Maps a URL to its Resource.
+typedef base::hash_map<
+  std::string,
+  linked_ptr<safe_browsing::ClientMalwareReportRequest::Resource> > ResourceMap;
+}
+
+class MalwareDetailsCacheCollector
+    : public base::RefCountedThreadSafe<MalwareDetailsCacheCollector> {
+
+ public:
+  MalwareDetailsCacheCollector();
+
+  // We use |request_context_getter|, we modify |resources| and
+  // |result|, and we call |callback|, so they must all remain alive
+  // for the lifetime of this object.
+  void StartCacheCollection(
+      net::URLRequestContextGetter* request_context_getter,
+      safe_browsing::ResourceMap* resources,
+      int* result,
+      Task* callback);
+
+  // Methods for getting the HTML body and HTTP headers from the HTTP cache.
+  // They run on the IO thread.
+  void CacheLoop(int result);
+
+  // Returns whether or not StartCacheCollection has been called.
+  bool InProgress();
+
+ protected:
+  virtual net::URLRequestContext* GetURLRequestContext();
+
+ private:
+  enum CacheState {
+    STATE_NONE,
+    STATE_OPEN_CACHE,
+    STATE_OPEN_CACHE_COMPLETE,
+    STATE_OPEN_ENTRY,
+    STATE_OPEN_ENTRY_COMPLETE,
+    STATE_READ_RESPONSE,
+    STATE_READ_RESPONSE_COMPLETE,
+    STATE_READ_DATA,
+    STATE_READ_DATA_COMPLETE,
+    STATE_CACHE_DONE,
+  };
+
+  // Points to the url for which we are fetching the HTTP cache entry or
+  // redirect chain.
+  safe_browsing::ResourceMap::iterator resources_it_;
+
+  // Points to the resources_ map in the MalwareDetails.
+  safe_browsing::ResourceMap* resources_;
+
+  // Points to the cache_result_ in the MalwareDetails.
+  int* result_;
+
+  // Method we call when we are done. The caller must be alive for the
+  // whole time, we are modifying its state (see above).
+  Task* callback_;
+
+  // The next cache loop state.
+  CacheState cache_state_;
+
+  // Used to get a pointer to the HTTP cache.
+  net::URLRequestContextGetter* request_context_getter_;
+
+  // The disk cache.
+  disk_cache::Backend* cache_;
+
+  // Callback for when the cache entry is ready.
+  // This is not ref-counted.
+  net::CompletionCallbackImpl<MalwareDetailsCacheCollector> cache_callback_;
+
+  // Callback for when the cache entry is opened.
+  scoped_refptr<
+    net::CancelableCompletionCallback<MalwareDetailsCacheCollector> >
+  entry_callback_;
+
+  // The current disk entry.
+  disk_cache::Entry* entry_;
+
+  // The current buffer for reading the contents of the disk entry.
+  scoped_refptr<net::IOBuffer> buf_;
+  int buf_len_;
+
+  friend class base::RefCountedThreadSafe<MalwareDetailsCacheCollector>;
+  ~MalwareDetailsCacheCollector();
+
+  int DoOpenCache();
+  int DoOpenCacheComplete(int result);
+  int DoOpenEntry();
+  int DoOpenEntryComplete(int result);
+  int DoReadResponse();
+  int DoReadResponseComplete(int result);
+  int DoReadData();
+  int DoReadDataComplete(int result);
+  void DoCacheDone(int result);
+
+  // Advances to the next entry in resources_it_.
+  int AdvanceEntry();
+};
+
+#endif  // CHROME_BROWSER_SAFE_BROWSING_MALWARE_DETAILS_CACHE_H_