1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
5 #ifndef CHROME_BROWSER_MANAGED_MODE_MANAGED_MODE_URL_FILTER_H_
6 #define CHROME_BROWSER_MANAGED_MODE_MANAGED_MODE_URL_FILTER_H_
8 #include "base/callback_forward.h"
9 #include "base/memory/ref_counted.h"
10 #include "base/memory/scoped_ptr.h"
11 #include "base/memory/scoped_vector.h"
12 #include "base/observer_list.h"
13 #include "base/threading/non_thread_safe.h"
14 #include "base/values.h"
15 #include "chrome/browser/managed_mode/managed_mode_site_list.h"
16 #include "chrome/browser/managed_mode/managed_users.h"
20 // This class manages the filtering behavior for a given URL, i.e. it tells
21 // callers if a given URL should be allowed, blocked or warned about. It uses
22 // information from multiple sources:
23 // * A default setting (allow, block or warn).
24 // * The set of installed and enabled content packs, which contain whitelists
25 // of URL patterns that should be allowed.
26 // * User-specified manual overrides (allow or block) for either sites
27 // (hostnames) or exact URLs, which take precedence over the previous
29 // References to it can be passed around on different threads (the refcounting
30 // is thread-safe), but the object itself should always be accessed on the same
31 // thread (member access isn't thread-safe).
32 class ManagedModeURLFilter
33 : public base::RefCountedThreadSafe<ManagedModeURLFilter>,
34 public base::NonThreadSafe {
36 enum FilteringBehavior {
40 HISTOGRAM_BOUNDING_VALUE
45 virtual void OnSiteListUpdated() = 0;
50 ManagedModeURLFilter();
52 static FilteringBehavior BehaviorFromInt(int behavior_value);
54 // Normalizes a URL for matching purposes.
55 static GURL Normalize(const GURL& url);
57 // Returns true if the URL has a standard scheme. Only URLs with standard
58 // schemes are filtered.
59 // This method is public for testing.
60 static bool HasStandardScheme(const GURL& url);
62 // Returns true if the |host| matches the pattern. A pattern is a hostname
63 // with one or both of the following modifications:
64 // - If the pattern starts with "*.", it matches the host or any subdomain
65 // (e.g. the pattern "*.google.com" would match google.com, www.google.com,
66 // or accounts.google.com).
67 // - If the pattern ends with ".*", it matches the host on any known TLD
68 // (e.g. the pattern "google.*" would match google.com or google.co.uk).
69 // See the ManagedModeURLFilterTest.HostMatchesPattern unit test for more
71 // Asterisks in other parts of the pattern are not allowed.
72 // |host| and |pattern| are assumed to be normalized to lower-case.
73 // This method is public for testing.
74 static bool HostMatchesPattern(const std::string& host,
75 const std::string& pattern);
77 void GetSites(const GURL& url,
78 std::vector<ManagedModeSiteList::Site*>* sites) const;
80 // Returns the filtering behavior for a given URL, based on the default
81 // behavior and whether it is on a site list.
82 FilteringBehavior GetFilteringBehaviorForURL(const GURL& url) const;
84 // Sets the filtering behavior for pages not on a list (default is ALLOW).
85 void SetDefaultFilteringBehavior(FilteringBehavior behavior);
87 // Asynchronously loads the specified site lists from disk and updates the
88 // filter to recognize each site on them.
89 // Calls |continuation| when the filter has been updated.
90 void LoadWhitelists(ScopedVector<ManagedModeSiteList> site_lists);
92 // Set the list of matched patterns to the passed in list.
93 // This method is only used for testing.
94 void SetFromPatterns(const std::vector<std::string>& patterns);
96 // Sets the set of manually allowed or blocked hosts.
97 void SetManualHosts(const std::map<std::string, bool>* host_map);
99 // Sets the set of manually allowed or blocked URLs.
100 void SetManualURLs(const std::map<GURL, bool>* url_map);
102 void AddObserver(Observer* observer);
103 void RemoveObserver(Observer* observer);
106 friend class base::RefCountedThreadSafe<ManagedModeURLFilter>;
107 ~ManagedModeURLFilter();
109 void SetContents(scoped_ptr<Contents> url_matcher);
111 ObserverList<Observer> observers_;
113 FilteringBehavior default_behavior_;
114 scoped_ptr<Contents> contents_;
116 // Maps from a URL to whether it is manually allowed (true) or blocked
118 std::map<GURL, bool> url_map_;
120 // Maps from a hostname to whether it is manually allowed (true) or blocked
122 std::map<std::string, bool> host_map_;
124 DISALLOW_COPY_AND_ASSIGN(ManagedModeURLFilter);
127 #endif // CHROME_BROWSER_MANAGED_MODE_MANAGED_MODE_URL_FILTER_H_