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1 // Copyright 2017 The Chromium Authors. All rights reserved. | 1 // Copyright 2017 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #import "components/open_from_clipboard/clipboard_recent_content_impl_ios.h" | 5 #import "components/open_from_clipboard/clipboard_recent_content_impl_ios.h" |
6 | 6 |
7 #import <CommonCrypto/CommonDigest.h> | 7 #import <CommonCrypto/CommonDigest.h> |
8 #import <UIKit/UIKit.h> | 8 #import <UIKit/UIKit.h> |
9 | 9 |
10 #import "base/mac/foundation_util.h" | 10 #import "base/mac/foundation_util.h" |
11 #include "base/strings/sys_string_conversions.h" | 11 #include "base/strings/sys_string_conversions.h" |
12 #include "base/sys_info.h" | 12 #include "base/sys_info.h" |
13 | 13 |
14 #if !defined(__has_feature) || !__has_feature(objc_arc) | 14 #if !defined(__has_feature) || !__has_feature(objc_arc) |
15 #error "This file requires ARC support." | 15 #error "This file requires ARC support." |
16 #endif | 16 #endif |
17 | 17 |
18 namespace { | 18 namespace { |
19 // Key used to store the pasteboard's current change count. If when resuming | 19 // Key used to store the pasteboard's current change count. If when resuming |
20 // chrome the pasteboard's change count is different from the stored one, then | 20 // chrome the pasteboard's change count is different from the stored one, then |
21 // it means that the pasteboard's content has changed. | 21 // it means that the pasteboard's content has changed. |
22 NSString* const kPasteboardChangeCountKey = @"PasteboardChangeCount"; | 22 NSString* const kPasteboardChangeCountKey = @"PasteboardChangeCount"; |
23 // Key used to store the last date at which it was detected that the pasteboard | 23 // Key used to store the last date at which it was detected that the pasteboard |
24 // changed. It is used to evaluate the age of the pasteboard's content. | 24 // changed. It is used to evaluate the age of the pasteboard's content. |
25 NSString* const kPasteboardChangeDateKey = @"PasteboardChangeDate"; | 25 NSString* const kPasteboardChangeDateKey = @"PasteboardChangeDate"; |
26 // Key used to store the hash of the content of the pasteboard. Whenever the | 26 // Key used to store the hash of the content of the pasteboard. Whenever the |
27 // hash changed, the pasteboard content is considered to have changed. | 27 // hash changed, the pasteboard content is considered to have changed. |
28 NSString* const kPasteboardEntryMD5Key = @"PasteboardEntryMD5"; | 28 NSString* const kPasteboardEntryMD5Key = @"PasteboardEntryMD5"; |
29 // Maximum age of clipboard in seconds. | |
30 NSTimeInterval const kMaximumAgeOfClipboard = 3 * 60 * 60; | |
31 | 29 |
32 // Compute a hash consisting of the first 4 bytes of the MD5 hash of |string|. | 30 // Compute a hash consisting of the first 4 bytes of the MD5 hash of |string|. |
33 // This value is used to detect pasteboard content change. Keeping only 4 bytes | 31 // This value is used to detect pasteboard content change. Keeping only 4 bytes |
34 // is a privacy requirement to introduce collision and allow deniability of | 32 // is a privacy requirement to introduce collision and allow deniability of |
35 // having copied a given string. | 33 // having copied a given string. |
36 NSData* WeakMD5FromNSString(NSString* string) { | 34 NSData* WeakMD5FromNSString(NSString* string) { |
37 unsigned char hash[CC_MD5_DIGEST_LENGTH]; | 35 unsigned char hash[CC_MD5_DIGEST_LENGTH]; |
38 const std::string clipboard = base::SysNSStringToUTF8(string); | 36 const std::string clipboard = base::SysNSStringToUTF8(string); |
39 const char* c_string = clipboard.c_str(); | 37 const char* c_string = clipboard.c_str(); |
40 CC_MD5(c_string, strlen(c_string), hash); | 38 CC_MD5(c_string, strlen(c_string), hash); |
41 NSData* data = [NSData dataWithBytes:hash length:4]; | 39 NSData* data = [NSData dataWithBytes:hash length:4]; |
42 return data; | 40 return data; |
43 } | 41 } |
44 | 42 |
45 } // namespace | 43 } // namespace |
46 | 44 |
47 @interface ClipboardRecentContentImplIOS () | 45 @interface ClipboardRecentContentImplIOS () |
48 | 46 |
49 // The user defaults from the app group used to optimize the pasteboard change | 47 // The user defaults from the app group used to optimize the pasteboard change |
50 // detection. | 48 // detection. |
51 @property(nonatomic, strong) NSUserDefaults* sharedUserDefaults; | 49 @property(nonatomic, strong) NSUserDefaults* sharedUserDefaults; |
52 // The pasteboard's change count. Increases everytime the pasteboard changes. | 50 // The pasteboard's change count. Increases everytime the pasteboard changes. |
53 @property(nonatomic) NSInteger lastPasteboardChangeCount; | 51 @property(nonatomic) NSInteger lastPasteboardChangeCount; |
54 // MD5 hash of the last registered pasteboard entry. | 52 // MD5 hash of the last registered pasteboard entry. |
55 @property(nonatomic, strong) NSData* lastPasteboardEntryMD5; | 53 @property(nonatomic, strong) NSData* lastPasteboardEntryMD5; |
56 // Contains the authorized schemes for URLs. | 54 // Contains the authorized schemes for URLs. |
57 @property(nonatomic, readonly) NSSet* authorizedSchemes; | 55 @property(nonatomic, readonly) NSSet* authorizedSchemes; |
58 // Delegate for metrics. | 56 // Delegate for metrics. |
59 @property(nonatomic, strong) id<ClipboardRecentContentDelegate> delegate; | 57 @property(nonatomic, strong) id<ClipboardRecentContentDelegate> delegate; |
| 58 // Maximum age of clipboard in seconds. |
| 59 @property(nonatomic, readonly) NSTimeInterval maximumAgeOfClipboard; |
60 | 60 |
61 // If the content of the pasteboard has changed, updates the change count, | 61 // If the content of the pasteboard has changed, updates the change count, |
62 // change date, and md5 of the latest pasteboard entry if necessary. | 62 // change date, and md5 of the latest pasteboard entry if necessary. |
63 - (void)updateIfNeeded; | 63 - (void)updateIfNeeded; |
64 | 64 |
65 // Returns whether the pasteboard changed since the last time a pasteboard | 65 // Returns whether the pasteboard changed since the last time a pasteboard |
66 // change was detected. | 66 // change was detected. |
67 - (BOOL)hasPasteboardChanged; | 67 - (BOOL)hasPasteboardChanged; |
68 | 68 |
69 // Loads information from the user defaults about the latest pasteboard entry. | 69 // Loads information from the user defaults about the latest pasteboard entry. |
70 - (void)loadFromUserDefaults; | 70 - (void)loadFromUserDefaults; |
71 | 71 |
72 // Returns the URL contained in the clipboard (if any). | 72 // Returns the URL contained in the clipboard (if any). |
73 - (NSURL*)URLFromPasteboard; | 73 - (NSURL*)URLFromPasteboard; |
74 | 74 |
75 // Returns the uptime. | 75 // Returns the uptime. |
76 - (NSTimeInterval)uptime; | 76 - (NSTimeInterval)uptime; |
77 | 77 |
78 @end | 78 @end |
79 | 79 |
80 @implementation ClipboardRecentContentImplIOS | 80 @implementation ClipboardRecentContentImplIOS |
81 | 81 |
82 @synthesize lastPasteboardChangeCount = _lastPasteboardChangeCount; | 82 @synthesize lastPasteboardChangeCount = _lastPasteboardChangeCount; |
83 @synthesize lastPasteboardChangeDate = _lastPasteboardChangeDate; | 83 @synthesize lastPasteboardChangeDate = _lastPasteboardChangeDate; |
84 @synthesize lastPasteboardEntryMD5 = _lastPasteboardEntryMD5; | 84 @synthesize lastPasteboardEntryMD5 = _lastPasteboardEntryMD5; |
85 @synthesize sharedUserDefaults = _sharedUserDefaults; | 85 @synthesize sharedUserDefaults = _sharedUserDefaults; |
86 @synthesize authorizedSchemes = _authorizedSchemes; | 86 @synthesize authorizedSchemes = _authorizedSchemes; |
87 @synthesize delegate = _delegate; | 87 @synthesize delegate = _delegate; |
| 88 @synthesize maximumAgeOfClipboard = _maximumAgeOfClipboard; |
88 | 89 |
89 - (instancetype)initWithAuthorizedSchemes:(NSSet<NSString*>*)authorizedSchemes | 90 - (instancetype)initWithMaxAge:(NSTimeInterval)maxAge |
90 userDefaults:(NSUserDefaults*)groupUserDefaults | 91 authorizedSchemes:(NSSet<NSString*>*)authorizedSchemes |
91 delegate:(id<ClipboardRecentContentDelegate>) | 92 userDefaults:(NSUserDefaults*)groupUserDefaults |
92 delegate { | 93 delegate:(id<ClipboardRecentContentDelegate>)delegate { |
93 self = [super init]; | 94 self = [super init]; |
94 if (self) { | 95 if (self) { |
| 96 _maximumAgeOfClipboard = maxAge; |
95 _delegate = delegate; | 97 _delegate = delegate; |
96 _authorizedSchemes = authorizedSchemes; | 98 _authorizedSchemes = authorizedSchemes; |
97 _sharedUserDefaults = groupUserDefaults; | 99 _sharedUserDefaults = groupUserDefaults; |
98 | 100 |
99 _lastPasteboardChangeCount = NSIntegerMax; | 101 _lastPasteboardChangeCount = NSIntegerMax; |
100 [self loadFromUserDefaults]; | 102 [self loadFromUserDefaults]; |
101 [self updateIfNeeded]; | 103 [self updateIfNeeded]; |
102 | 104 |
103 // Makes sure |last_pasteboard_change_count_| was properly initialized. | 105 // Makes sure |last_pasteboard_change_count_| was properly initialized. |
104 DCHECK_NE(_lastPasteboardChangeCount, NSIntegerMax); | 106 DCHECK_NE(_lastPasteboardChangeCount, NSIntegerMax); |
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143 return changeCountChanged; | 145 return changeCountChanged; |
144 } | 146 } |
145 | 147 |
146 BOOL md5Changed = | 148 BOOL md5Changed = |
147 ![[self getCurrentMD5] isEqualToData:self.lastPasteboardEntryMD5]; | 149 ![[self getCurrentMD5] isEqualToData:self.lastPasteboardEntryMD5]; |
148 return md5Changed; | 150 return md5Changed; |
149 } | 151 } |
150 | 152 |
151 - (NSURL*)recentURLFromClipboard { | 153 - (NSURL*)recentURLFromClipboard { |
152 [self updateIfNeeded]; | 154 [self updateIfNeeded]; |
153 if ([self clipboardContentAge] > kMaximumAgeOfClipboard) { | 155 if ([self clipboardContentAge] > self.maximumAgeOfClipboard) { |
154 return nil; | 156 return nil; |
155 } | 157 } |
156 return [self URLFromPasteboard]; | 158 return [self URLFromPasteboard]; |
157 } | 159 } |
158 | 160 |
159 - (NSTimeInterval)clipboardContentAge { | 161 - (NSTimeInterval)clipboardContentAge { |
160 return -[self.lastPasteboardChangeDate timeIntervalSinceNow]; | 162 return -[self.lastPasteboardChangeDate timeIntervalSinceNow]; |
161 } | 163 } |
162 | 164 |
163 - (void)suppressClipboardContent { | 165 - (void)suppressClipboardContent { |
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208 forKey:kPasteboardChangeDateKey]; | 210 forKey:kPasteboardChangeDateKey]; |
209 [self.sharedUserDefaults setObject:self.lastPasteboardEntryMD5 | 211 [self.sharedUserDefaults setObject:self.lastPasteboardEntryMD5 |
210 forKey:kPasteboardEntryMD5Key]; | 212 forKey:kPasteboardEntryMD5Key]; |
211 } | 213 } |
212 | 214 |
213 - (NSTimeInterval)uptime { | 215 - (NSTimeInterval)uptime { |
214 return base::SysInfo::Uptime().InSecondsF(); | 216 return base::SysInfo::Uptime().InSecondsF(); |
215 } | 217 } |
216 | 218 |
217 @end | 219 @end |
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