Upstream iOS' Open from Clipboard component.

The component's goal is to provide omnibox suggestions based on the
clipboard's content.

BUG=None.

Review URL: https://codereview.chromium.org/930323003

Cr-Commit-Position: refs/heads/master@{#317055}

14 files changed, 400 insertions, 0 deletions

diff --git a/build/ios/grit_whitelist.txt b/build/ios/grit_whitelist.txt
index c1edfdf..ab1fb5d 100644
--- a/build/ios/grit_whitelist.txt
+++ b/build/ios/grit_whitelist.txt
@@ -719,6 +719,7 @@ IDS_LIBADDRESSINPUT_UNRECOGNIZED_FORMAT_ZIP_CODE_EXAMPLE
 IDS_LIBADDRESSINPUT_UNRECOGNIZED_FORMAT_ZIP_CODE_EXAMPLE_AND_URL
 IDS_LIBADDRESSINPUT_VILLAGE_TOWNSHIP
 IDS_LIBADDRESSINPUT_ZIP_CODE_LABEL
+IDS_LINK_FROM_CLIPBOARD
 IDS_LOGIN_DIALOG_OK_BUTTON_LABEL
 IDS_LOGIN_DIALOG_PASSWORD_FIELD
 IDS_LOGIN_DIALOG_TITLE
diff --git a/components/OWNERS b/components/OWNERS
index 6946515..d563137 100644
--- a/components/OWNERS
+++ b/components/OWNERS
@@ -145,6 +145,9 @@ per-file onc.gypi=gspencer@chromium.org
 per-file onc.gypi=pneubeck@chromium.org
 per-file onc.gypi=stevenjb@chromium.org
 
+per-file open_from_clipboard.gypi=jif@chromium.org
+per-file open_from_clipboard_strings.grdp=jif@chromium.org
+
 per-file packed_ct_ev_whitelist.gypi=eranm@chromium.org
 per-file packed_ct_ev_whitelist.gypi=rsleevi@chromium.org
 
diff --git a/components/components.gyp b/components/components.gyp
index 974d292..39e07f7 100644
--- a/components/components.gyp
+++ b/components/components.gyp
@@ -83,6 +83,7 @@
     }],
     ['OS == "ios"', {
       'includes': [
+        'open_from_clipboard.gypi',
         'webp_transcode.gypi',
       ],
     }],
diff --git a/components/components_strings.grd b/components/components_strings.grd
index 35d1c59..e48591a 100644
--- a/components/components_strings.grd
+++ b/components/components_strings.grd
@@ -174,6 +174,7 @@
       <part file="dom_distiller_strings.grdp" />
       <part file="error_page_strings.grdp" />
       <part file="omnibox_strings.grdp" />
+      <part file="open_from_clipboard_strings.grdp" />
       <part file="password_manager_strings.grdp" />
       <part file="pdf_strings.grdp" />
       <part file="policy_strings.grdp" />
diff --git a/components/open_from_clipboard.gypi b/components/open_from_clipboard.gypi
new file mode 100644
index 0000000..103e6d0
--- /dev/null
+++ b/components/open_from_clipboard.gypi
@@ -0,0 +1,28 @@
+# 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.
+
+{
+  'targets': [
+    {
+      'target_name': 'open_from_clipboard',
+      'type': 'static_library',
+      'dependencies': [
+        '../base/base.gyp:base',
+        '../url/url.gyp:url_lib',
+        'components_strings.gyp:components_strings',
+        'omnibox',
+      ],
+      'include_dirs': [
+        '..',
+      ],
+      'sources': [
+        'open_from_clipboard/clipboard_recent_content.h',
+        'open_from_clipboard/clipboard_recent_content_ios.h',
+        'open_from_clipboard/clipboard_recent_content_ios.mm',
+        'open_from_clipboard/clipboard_url_provider.cc',
+        'open_from_clipboard/clipboard_url_provider.h',
+      ],
+    },
+  ],
+}
diff --git a/components/open_from_clipboard/DEPS b/components/open_from_clipboard/DEPS
new file mode 100644
index 0000000..30a8913
--- /dev/null
+++ b/components/open_from_clipboard/DEPS
@@ -0,0 +1,5 @@
+include_rules = [
+  "+components/omnibox",
+  "+grit/components_strings.h",
+  "+ui/base/l10n",
+]
diff --git a/components/open_from_clipboard/OWNERS b/components/open_from_clipboard/OWNERS
new file mode 100644
index 0000000..48eb126
--- /dev/null
+++ b/components/open_from_clipboard/OWNERS
@@ -0,0 +1 @@
+jif@chromium.org
\ No newline at end of file
diff --git a/components/open_from_clipboard/clipboard_recent_content.h b/components/open_from_clipboard/clipboard_recent_content.h
new file mode 100644
index 0000000..31c274c
--- /dev/null
+++ b/components/open_from_clipboard/clipboard_recent_content.h
@@ -0,0 +1,43 @@
+// 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.
+
+#ifndef COMPONENTS_OPEN_FROM_CLIPBOARD_CLIPBOARD_RECENT_CONTENT_H_
+#define COMPONENTS_OPEN_FROM_CLIPBOARD_CLIPBOARD_RECENT_CONTENT_H_
+
+#include <string>
+
+#include "base/macros.h"
+
+class GURL;
+
+// Helper class returning an URL if the content of the clipboard can be turned
+// into an URL, and if it estimates that the content of the clipboard is not too
+// old.
+class ClipboardRecentContent {
+ public:
+  // Returns an instance of the ClipboardContent singleton.
+  static ClipboardRecentContent* GetInstance();
+
+  // Returns true if the clipboard contains a recent URL, and copies it in
+  // |url|. Otherwise, returns false. |url| must not be null.
+  virtual bool GetRecentURLFromClipboard(GURL* url) const = 0;
+
+  // Sets which URL scheme this app can be opened with. Used by
+  // ClipboardRecentContent to determine whether or not the clipboard contains
+  // a relevant URL. |application_scheme| may be empty.
+  void set_application_scheme(const std::string& application_scheme) {
+    application_scheme_ = application_scheme;
+  }
+
+ protected:
+  ClipboardRecentContent() {}
+  virtual ~ClipboardRecentContent() {}
+  // Contains the URL scheme opening the app. May be empty.
+  std::string application_scheme_;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(ClipboardRecentContent);
+};
+
+#endif  // COMPONENTS_OPEN_FROM_CLIPBOARD_CLIPBOARD_RECENT_CONTENT_H_
diff --git a/components/open_from_clipboard/clipboard_recent_content_ios.h b/components/open_from_clipboard/clipboard_recent_content_ios.h
new file mode 100644
index 0000000..5c3ff46
--- /dev/null
+++ b/components/open_from_clipboard/clipboard_recent_content_ios.h
@@ -0,0 +1,53 @@
+// 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.
+
+#ifndef COMPONENTS_OPEN_FROM_CLIPBOARD_CLIPBOARD_RECENT_CONTENT_IOS_H_
+#define COMPONENTS_OPEN_FROM_CLIPBOARD_CLIPBOARD_RECENT_CONTENT_IOS_H_
+
+#include "base/mac/scoped_nsobject.h"
+#include "components/open_from_clipboard/clipboard_recent_content.h"
+#include "url/gurl.h"
+
+@class NSDate;
+@class PasteboardNotificationListenerBridge;
+
+template <typename T>
+struct DefaultSingletonTraits;
+
+// IOS implementation of ClipboardRecentContent
+class ClipboardRecentContentIOS : public ClipboardRecentContent {
+ public:
+  static ClipboardRecentContentIOS* GetInstance();
+  // Notifies that the content of the pasteboard may have changed.
+  void PasteboardChanged();
+
+  // ClipboardRecentContent implementation.
+  bool GetRecentURLFromClipboard(GURL* url) const override;
+
+ private:
+  friend struct DefaultSingletonTraits<ClipboardRecentContentIOS>;
+
+  ClipboardRecentContentIOS();
+  ~ClipboardRecentContentIOS() override;
+  // Loads information from the user defaults about the latest clipboard entry.
+  void LoadFromUserDefaults();
+  // Saves information to the user defaults about the latest clipboard entry.
+  void SaveToUserDefaults();
+  // Returns the URL contained in the clipboard (if any).
+  GURL URLFromPasteboard();
+
+  // The pasteboard's change count. Increases everytime the pasteboard changes.
+  NSInteger lastPasteboardChangeCount_;
+  // Estimation of the date when the pasteboard changed.
+  base::scoped_nsobject<NSDate> lastPasteboardChangeDate_;
+  // Cache of the GURL contained in the pasteboard (if any).
+  GURL urlFromPasteboardCache_;
+  // Bridge to receive notification when the pasteboard changes.
+  base::scoped_nsobject<PasteboardNotificationListenerBridge>
+      notificationBridge_;
+
+  DISALLOW_COPY_AND_ASSIGN(ClipboardRecentContentIOS);
+};
+
+#endif  // COMPONENTS_OPEN_FROM_CLIPBOARD_CLIPBOARD_RECENT_CONTENT_IOS_H_
diff --git a/components/open_from_clipboard/clipboard_recent_content_ios.mm b/components/open_from_clipboard/clipboard_recent_content_ios.mm
new file mode 100644
index 0000000..9ec6f07
--- /dev/null
+++ b/components/open_from_clipboard/clipboard_recent_content_ios.mm
@@ -0,0 +1,162 @@
+// 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"
+#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];
+}
diff --git a/components/open_from_clipboard/clipboard_url_provider.cc b/components/open_from_clipboard/clipboard_url_provider.cc
new file mode 100644
index 0000000..33fdf38
--- /dev/null
+++ b/components/open_from_clipboard/clipboard_url_provider.cc
@@ -0,0 +1,59 @@
+// 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_url_provider.h"
+
+#include "base/logging.h"
+#include "base/strings/utf_string_conversions.h"
+#include "components/omnibox/autocomplete_input.h"
+#include "components/open_from_clipboard/clipboard_recent_content.h"
+#include "grit/components_strings.h"
+#include "ui/base/l10n/l10n_util.h"
+
+namespace {
+// Score defining the priority of the suggestion. 1600 guarantees that the
+// suggestion will always be first. See table in autocomplete_provider.h.
+const int kClipboardURLProviderRelevance = 1600;
+}  // namespace
+
+ClipboardURLProvider::ClipboardURLProvider(
+    ClipboardRecentContent* clipboard_recent_content)
+    : AutocompleteProvider(AutocompleteProvider::TYPE_SHORTCUTS),
+      clipboard_recent_content_(clipboard_recent_content) {
+  DCHECK(clipboard_recent_content_);
+}
+
+ClipboardURLProvider::~ClipboardURLProvider() {
+}
+
+void ClipboardURLProvider::Start(const AutocompleteInput& input,
+                                 bool minimal_changes,
+                                 bool called_due_to_focus) {
+  matches_.clear();
+  // Attempt to add an AutocompleteMatch only if the user has not entered
+  // anything in the omnibox.
+  if (input.cursor_position() == base::string16::npos) {
+    GURL url;
+    if (clipboard_recent_content_->GetRecentURLFromClipboard(&url)) {
+      DCHECK(url.is_valid());
+      AutocompleteMatch match(this, kClipboardURLProviderRelevance, false,
+                              AutocompleteMatchType::NAVSUGGEST_PERSONALIZED);
+      match.allowed_to_be_default_match = true;
+      match.destination_url = url;
+      match.contents.assign(base::UTF8ToUTF16(url.spec()));
+      AutocompleteMatch::ClassifyLocationInString(
+          base::string16::npos, 0, match.contents.length(),
+          ACMatchClassification::URL, &match.contents_class);
+
+      match.description.assign(
+          l10n_util::GetStringUTF16(IDS_LINK_FROM_CLIPBOARD));
+      AutocompleteMatch::ClassifyLocationInString(
+          base::string16::npos, 0, match.description.length(),
+          ACMatchClassification::URL, &match.description_class);
+
+      matches_.push_back(match);
+    }
+  }
+  done_ = true;
+}
diff --git a/components/open_from_clipboard/clipboard_url_provider.h b/components/open_from_clipboard/clipboard_url_provider.h
new file mode 100644
index 0000000..38122cc
--- /dev/null
+++ b/components/open_from_clipboard/clipboard_url_provider.h
@@ -0,0 +1,27 @@
+// 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.
+
+#ifndef COMPONENTS_OPEN_FROM_CLIPBOARD_CLIPBOARD_URL_PROVIDER_H_
+#define COMPONENTS_OPEN_FROM_CLIPBOARD_CLIPBOARD_URL_PROVIDER_H_
+
+#include "components/omnibox/autocomplete_provider.h"
+
+class ClipboardRecentContent;
+
+// Autocomplete provider offering content based on the clipboard's content.
+class ClipboardURLProvider : public AutocompleteProvider {
+ public:
+  ClipboardURLProvider(ClipboardRecentContent* clipboard_recent_content);
+  void Start(const AutocompleteInput& input,
+             bool minimal_changes,
+             bool called_due_to_focus) override;
+
+ private:
+  ~ClipboardURLProvider() override;
+  ClipboardRecentContent* clipboard_recent_content_;
+
+  DISALLOW_COPY_AND_ASSIGN(ClipboardURLProvider);
+};
+
+#endif  // COMPONENTS_OPEN_FROM_CLIPBOARD_CLIPBOARD_URL_PROVIDER_H_
diff --git a/components/open_from_clipboard_strings.grdp b/components/open_from_clipboard_strings.grdp
new file mode 100644
index 0000000..c6ec2b5
--- /dev/null
+++ b/components/open_from_clipboard_strings.grdp
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<grit-part>
+  <message name="IDS_LINK_FROM_CLIPBOARD" desc="The label in the omnibox dropdown explaining that the link has been extracted from the user's clipboard. [Length: 21em]">
+    Link you copied
+  </message>
+</grit-part>
diff --git a/tools/metrics/actions/actions.xml b/tools/metrics/actions/actions.xml
index d222a02..95674aa 100644
--- a/tools/metrics/actions/actions.xml
+++ b/tools/metrics/actions/actions.xml
@@ -7592,6 +7592,16 @@ should be able to be added at any place in this file.
   <description>Please enter the description of this user action.</description>
 </action>
 
+<action name="MobileOmniboxClipboardChanged">
+  <owner>jif@chromium.org</owner>
+  <description>
+    Emitted when Chrome detects that the clipboard contains a new URL. This
+    occurs either when Chrome enters the foreground and notices that the content
+    of the clipboard changed, or when the clipboard changes while Chrome is in
+    the foreground.
+  </description>
+</action>
+
 <action name="MobileOmniboxRefineSuggestion">
   <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
   <description>Please enter the description of this user action.</description>