Upstream iOS' Open from Clipboard component.

components/open_from_clipboard/clipboard_recent_content_ios.mm

Index: components/open_from_clipboard/clipboard_recent_content_ios.mm
diff --git a/components/open_from_clipboard/clipboard_recent_content_ios.mm b/components/open_from_clipboard/clipboard_recent_content_ios.mm
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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.
+
+#include "components/open_from_clipboard/clipboard_recent_content_ios.h"
+
+#import <UIKit/UIKit.h>
+
+#include "base/logging.h"
+#include "base/macros.h"
+#include "base/memory/singleton.h"
+#include "base/metrics/user_metrics.h"
+#include "base/strings/sys_string_conversions.h"
+#import "net/base/mac/url_conversions.h"
+#include "url/gurl.h"
+#include "url/url_constants.h"
+
+ClipboardRecentContent* ClipboardRecentContent::GetInstance() {
+  return ClipboardRecentContentIOS::GetInstance();
+}
+
+// Bridge that forwards pasteboard change notifications to its delegate.
+@interface PasteboardNotificationListenerBridge : NSObject {
+  ClipboardRecentContentIOS* _delegate;
+}
+@end
+
+@implementation PasteboardNotificationListenerBridge
+
+- (id)initWithDelegate:(ClipboardRecentContentIOS*)delegate {
+  DCHECK(delegate);
+  self = [super init];
+  if (self) {
+    _delegate = delegate;
+    [[NSNotificationCenter defaultCenter]
+        addObserver:self
+           selector:@selector(pasteboardChangedNotification:)
+               name:UIPasteboardChangedNotification
+             object:[UIPasteboard generalPasteboard]];
+    [[NSNotificationCenter defaultCenter]
+        addObserver:self
+           selector:@selector(pasteboardChangedNotification:)
+               name:UIApplicationDidBecomeActiveNotification
+             object:nil];
+  }
+  return self;
+}
+
+- (void)dealloc {
+  [[NSNotificationCenter defaultCenter]
+      removeObserver:self
+                name:UIPasteboardChangedNotification
+              object:[UIPasteboard generalPasteboard]];
+  [[NSNotificationCenter defaultCenter]
+      removeObserver:self
+                name:UIApplicationDidBecomeActiveNotification
+              object:[UIPasteboard generalPasteboard]];
+  [super dealloc];
+}
+
+- (void)pasteboardChangedNotification:(NSNotification*)notification {
+  _delegate->PasteboardChanged();
+}
+
+@end
+
+namespace {
+// Key used to store the pasteboard's current change count. If when resuming
+// chrome the pasteboard's change count is different from the stored one, then
+// it means that the pasteboard's content has changed.
+NSString* kPasteboardChangeCountKey = @"PasteboardChangeCount";
+// Key used to store the last date at which it was detected that the pasteboard
+// changed. It is used to evaluate the age of the pasteboard's content.
+NSString* kPasteboardChangeDateKey = @"PasteboardChangeDate";
+NSTimeInterval kMaximumAgeOfClipboardInSeconds = 6 * 60 * 60;
+// Schemes accepted by the ClipboardRecentContentIOS.
+const char* kAuthorizedSchemes[] = {
+    url::kHttpScheme,
+    url::kHttpsScheme,
+    url::kDataScheme,
+    url::kAboutScheme,
+};
+}  // namespace
+
+ClipboardRecentContentIOS* ClipboardRecentContentIOS::GetInstance() {
+  return Singleton<ClipboardRecentContentIOS>::get();
+}
+
+bool ClipboardRecentContentIOS::GetRecentURLFromClipboard(GURL* url) const {
+  DCHECK(url);
+  if (-[lastPasteboardChangeDate_ timeIntervalSinceNow] >
+      kMaximumAgeOfClipboardInSeconds) {
+    return false;
+  }
+  if (urlFromPasteboardCache_.is_valid()) {
+    *url = urlFromPasteboardCache_;
+    return true;
+  }
+  return false;
+}
+
+void ClipboardRecentContentIOS::PasteboardChanged() {
+  if ([UIPasteboard generalPasteboard].changeCount !=
+      lastPasteboardChangeCount_) {
+    urlFromPasteboardCache_ = URLFromPasteboard();
+    if (!urlFromPasteboardCache_.is_empty()) {
+      base::RecordAction(
+          base::UserMetricsAction("MobileOmniboxClipboardChanged"));
+    }
+    lastPasteboardChangeDate_.reset([[NSDate date] retain]);
+    lastPasteboardChangeCount_ = [UIPasteboard generalPasteboard].changeCount;
+    SaveToUserDefaults();
+  }
+}
+
+ClipboardRecentContentIOS::ClipboardRecentContentIOS()
+    : ClipboardRecentContent() {
+  urlFromPasteboardCache_ = URLFromPasteboard();
+  LoadFromUserDefaults();
+  if ([UIPasteboard generalPasteboard].changeCount !=
+      lastPasteboardChangeCount_) {
+    PasteboardChanged();
+  }
+  notificationBridge_.reset(
+      [[PasteboardNotificationListenerBridge alloc] initWithDelegate:this]);
+}
+
+ClipboardRecentContentIOS::~ClipboardRecentContentIOS() {
+}
+
+GURL ClipboardRecentContentIOS::URLFromPasteboard() {
+  const std::string clipboard =
+      base::SysNSStringToUTF8([[UIPasteboard generalPasteboard] string]);
+  GURL gurl = GURL(clipboard);
+  if (gurl.is_valid()) {
+    for (size_t i = 0; i < arraysize(kAuthorizedSchemes); ++i) {
+      if (gurl.SchemeIs(kAuthorizedSchemes[i])) {
+        return gurl;
+      }
+    }
+    if (!application_scheme_.empty() &&
+        gurl.SchemeIs(application_scheme_.c_str())) {
+      return gurl;
+    }
+  }
+  return GURL::EmptyGURL();
+}
+
+void ClipboardRecentContentIOS::LoadFromUserDefaults() {
+  lastPasteboardChangeCount_ = [[NSUserDefaults standardUserDefaults]
+      integerForKey:kPasteboardChangeCountKey];
+  lastPasteboardChangeDate_.reset([[[NSUserDefaults standardUserDefaults]
+      objectForKey:kPasteboardChangeDateKey] retain]);
+  DCHECK(!lastPasteboardChangeDate_ ||
+         [lastPasteboardChangeDate_ isKindOfClass:[NSDate class]]);
+}
+
+void ClipboardRecentContentIOS::SaveToUserDefaults() {
+  [[NSUserDefaults standardUserDefaults] setInteger:lastPasteboardChangeCount_
+                                             forKey:kPasteboardChangeCountKey];
+  [[NSUserDefaults standardUserDefaults] setObject:lastPasteboardChangeDate_
+                                            forKey:kPasteboardChangeDateKey];
+}