ui/base/clipboard/clipboard_aura.cc

// Copyright (c) 2012 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 "ui/base/clipboard/clipboard_aura.h"

#include <stdint.h>

#include <limits>
#include <list>
#include <memory>
#include <utility>

#include "base/files/file_path.h"
#include "base/logging.h"
#include "base/macros.h"
#include "base/memory/ptr_util.h"
#include "base/no_destructor.h"
#include "base/strings/utf_string_conversions.h"
#include "third_party/skia/include/core/SkBitmap.h"
#include "ui/base/clipboard/clipboard_monitor.h"
#include "ui/base/clipboard/custom_data_helper.h"
#include "ui/gfx/geometry/size.h"

namespace ui {

namespace {

const char kMimeTypeFilename[] = "chromium/filename";
const char kMimeTypeBitmap[] = "image/bmp";
const size_t kMaxClipboardSize = 1;

// Clipboard data format used by AuraClipboard.
enum AuraClipboardFormat {
  TEXT      = 1 << 0,
  HTML      = 1 << 1,
  RTF       = 1 << 2,
  BOOKMARK  = 1 << 3,
  BITMAP    = 1 << 4,
  CUSTOM    = 1 << 5,
  WEB       = 1 << 6,
};

// ClipboardData contains data copied to the Clipboard for a variety of formats.
// It mostly just provides APIs to cleanly access and manipulate this data.
class ClipboardData {
 public:
  ClipboardData()
      : web_smart_paste_(false),
        format_(0) {}

  virtual ~ClipboardData() {}

  // Bitmask of AuraClipboardFormat types.
  int format() const { return format_; }

  const std::string& text() const { return text_; }
  void set_text(const std::string& text) {
    text_ = text;
    format_ |= TEXT;
  }

  const std::string& markup_data() const { return markup_data_; }
  void set_markup_data(const std::string& markup_data) {
    markup_data_ = markup_data;
    format_ |= HTML;
  }

  const std::string& rtf_data() const { return rtf_data_; }
  void SetRTFData(const std::string& rtf_data) {
    rtf_data_ = rtf_data;
    format_ |= RTF;
  }

  const std::string& url() const { return url_; }
  void set_url(const std::string& url) {
    url_ = url;
    format_ |= HTML;
  }

  const std::string& bookmark_title() const { return bookmark_title_; }
  void set_bookmark_title(const std::string& bookmark_title) {
    bookmark_title_ = bookmark_title;
    format_ |= BOOKMARK;
  }

  const std::string& bookmark_url() const { return bookmark_url_; }
  void set_bookmark_url(const std::string& bookmark_url) {
    bookmark_url_ = bookmark_url;
    format_ |= BOOKMARK;
  }

  const SkBitmap& bitmap() const { return bitmap_; }
  void SetBitmapData(const SkBitmap& bitmap) {
    if (bitmap_.tryAllocPixels(bitmap.info())) {
      bitmap.readPixels(bitmap_.info(), bitmap_.getPixels(), bitmap_.rowBytes(),
                        0, 0);
    }
    format_ |= BITMAP;
  }

  const std::string& custom_data_format() const { return custom_data_format_; }
  const std::string& custom_data_data() const { return custom_data_data_; }
  void SetCustomData(const std::string& data_format,
                     const std::string& data_data) {
    if (data_data.size() == 0) {
      custom_data_data_.clear();
      custom_data_format_.clear();
      return;
    }
    custom_data_data_ = data_data;
    custom_data_format_ = data_format;
    format_ |= CUSTOM;
  }

  bool web_smart_paste() const { return web_smart_paste_; }
  void set_web_smart_paste(bool web_smart_paste) {
    web_smart_paste_ = web_smart_paste;
    format_ |= WEB;
  }

 private:
  // Plain text in UTF8 format.
  std::string text_;

  // HTML markup data in UTF8 format.
  std::string markup_data_;
  std::string url_;

  // RTF data.
  std::string rtf_data_;

  // Bookmark title in UTF8 format.
  std::string bookmark_title_;
  std::string bookmark_url_;

  // Filenames.
  std::vector<std::string> files_;

  // Bitmap images.
  SkBitmap bitmap_;

  // Data with custom format.
  std::string custom_data_format_;
  std::string custom_data_data_;

  // WebKit smart paste data.
  bool web_smart_paste_;

  int format_;

  DISALLOW_COPY_AND_ASSIGN(ClipboardData);
};

// Platform clipboard implementation for Aura. This handles things like format
// conversion, versioning of clipboard items etc. The goal is to roughly provide
// a substitute to platform clipboards on other platforms such as GtkClipboard
// on gtk or winapi clipboard on win.
class AuraClipboard {
 public:
  AuraClipboard() : sequence_number_(0) {
  }

  ~AuraClipboard() {}

  void Clear() {
    sequence_number_++;
    data_list_.clear();
    ClipboardMonitor::GetInstance()->NotifyClipboardDataChanged();
  }

  uint64_t sequence_number() const {
    return sequence_number_;
  }

  // Returns the data currently on the top of the clipboard stack, NULL if the
  // clipboard stack is empty.
  const ClipboardData* GetData() const {
    if (data_list_.empty())
      return NULL;
    return data_list_.front().get();
  }

  // Returns true if the data on top of the clipboard stack has format |format|
  // or another format that can be converted to |format|.
  bool IsFormatAvailable(AuraClipboardFormat format) const {
    switch (format) {
      case TEXT:
        return HasFormat(TEXT) || HasFormat(BOOKMARK);
      default:
        return HasFormat(format);
    }
  }

  // Reads text from the data at the top of clipboard stack.
  void ReadText(base::string16* result) const {
    std::string utf8_result;
    ReadAsciiText(&utf8_result);
    *result = base::UTF8ToUTF16(utf8_result);
  }

  // Reads ascii text from the data at the top of clipboard stack.
  void ReadAsciiText(std::string* result) const {
    result->clear();
    const ClipboardData* data = GetData();
    if (!data)
      return;
    if (HasFormat(TEXT))
      *result = data->text();
    else if (HasFormat(HTML))
      *result = data->markup_data();
    else if (HasFormat(BOOKMARK))
      *result = data->bookmark_url();
  }

  // Reads HTML from the data at the top of clipboard stack.
  void ReadHTML(base::string16* markup,
                std::string* src_url,
                uint32_t* fragment_start,
                uint32_t* fragment_end) const {
    markup->clear();
    if (src_url)
      src_url->clear();
    *fragment_start = 0;
    *fragment_end = 0;

    if (!HasFormat(HTML))
      return;

    const ClipboardData* data = GetData();
    *markup = base::UTF8ToUTF16(data->markup_data());
    *src_url = data->url();

    *fragment_start = 0;
    DCHECK_LE(markup->length(), std::numeric_limits<uint32_t>::max());
    *fragment_end = static_cast<uint32_t>(markup->length());
  }

  // Reads RTF from the data at the top of clipboard stack.
  void ReadRTF(std::string* result) const {
    result->clear();
    const ClipboardData* data = GetData();
    if (!HasFormat(RTF))
      return;

    *result = data->rtf_data();
  }

  // Reads image from the data at the top of clipboard stack.
  SkBitmap ReadImage() const {
    SkBitmap img;
    if (!HasFormat(BITMAP))
      return img;

    // A shallow copy should be fine here, but just to be safe...
    const SkBitmap& clipboard_bitmap = GetData()->bitmap();
    if (img.tryAllocPixels(clipboard_bitmap.info())) {
      clipboard_bitmap.readPixels(img.info(), img.getPixels(), img.rowBytes(),
                                  0, 0);
    }
    return img;
  }

  // Reads data of type |type| from the data at the top of clipboard stack.
  void ReadCustomData(const base::string16& type,
                      base::string16* result) const {
    result->clear();
    const ClipboardData* data = GetData();
    if (!HasFormat(CUSTOM))
      return;

    ui::ReadCustomDataForType(data->custom_data_data().c_str(),
        data->custom_data_data().size(),
        type, result);
  }

  // Reads bookmark from the data at the top of clipboard stack.
  void ReadBookmark(base::string16* title, std::string* url) const {
    title->clear();
    url->clear();
    if (!HasFormat(BOOKMARK))
      return;

    const ClipboardData* data = GetData();
    *title = base::UTF8ToUTF16(data->bookmark_title());
    *url = data->bookmark_url();
  }

  void ReadData(const std::string& type, std::string* result) const {
    result->clear();
    const ClipboardData* data = GetData();
    if (!HasFormat(CUSTOM) || type != data->custom_data_format())
      return;

    *result = data->custom_data_data();
  }

  // Writes |data| to the top of the clipboard stack.
  void WriteData(std::unique_ptr<ClipboardData> data) {
    DCHECK(data);
    AddToListEnsuringSize(std::move(data));
    ClipboardMonitor::GetInstance()->NotifyClipboardDataChanged();
  }

 private:
  // True if the data on top of the clipboard stack has format |format|.
  bool HasFormat(AuraClipboardFormat format) const {
    const ClipboardData* data = GetData();
    return data ? data->format() & format : false;
  }

  void AddToListEnsuringSize(std::unique_ptr<ClipboardData> data) {
    DCHECK(data);
    sequence_number_++;
    data_list_.push_front(std::move(data));

    // If the size of list becomes more than the maximum allowed, we delete the
    // last element.
    if (data_list_.size() > kMaxClipboardSize) {
      data_list_.pop_back();
    }
  }

  // Stack containing various versions of ClipboardData.
  std::list<std::unique_ptr<ClipboardData>> data_list_;

  // Sequence number uniquely identifying clipboard state.
  uint64_t sequence_number_;

  DISALLOW_COPY_AND_ASSIGN(AuraClipboard);
};

AuraClipboard* g_aura_clipboard = NULL;

AuraClipboard* GetClipboard() {
  if (!g_aura_clipboard)
    g_aura_clipboard = new AuraClipboard();
  return g_aura_clipboard;
}

void DeleteClipboard() {
  delete g_aura_clipboard;
  g_aura_clipboard = NULL;
}

// Helper class to build a ClipboardData object and write it to clipboard.
class ClipboardDataBuilder {
 public:
  static void CommitToClipboard() {
    GetClipboard()->WriteData(TakeCurrentData());
  }

  static void WriteText(const char* text_data, size_t text_len) {
    ClipboardData* data = GetCurrentData();
    data->set_text(std::string(text_data, text_len));
  }

  static void WriteHTML(const char* markup_data,
                        size_t markup_len,
                        const char* url_data,
                        size_t url_len) {
    ClipboardData* data = GetCurrentData();
    data->set_markup_data(std::string(markup_data, markup_len));
    data->set_url(std::string(url_data, url_len));
  }

  static void WriteRTF(const char* rtf_data, size_t rtf_len) {
    ClipboardData* data = GetCurrentData();
    data->SetRTFData(std::string(rtf_data, rtf_len));
  }

  static void WriteBookmark(const char* title_data,
                            size_t title_len,
                            const char* url_data,
                            size_t url_len) {
    ClipboardData* data = GetCurrentData();
    data->set_bookmark_title(std::string(title_data, title_len));
    data->set_bookmark_url(std::string(url_data, url_len));
  }

  static void WriteWebSmartPaste() {
    ClipboardData* data = GetCurrentData();
    data->set_web_smart_paste(true);
  }

  static void WriteBitmap(const SkBitmap& bitmap) {
    ClipboardData* data = GetCurrentData();
    data->SetBitmapData(bitmap);
  }

  static void WriteData(const std::string& format,
                        const char* data_data,
                        size_t data_len) {
    ClipboardData* data = GetCurrentData();
    data->SetCustomData(format, std::string(data_data, data_len));
  }

 private:
  static ClipboardData* GetCurrentData() {
    if (!current_data_)
      current_data_ = new ClipboardData;
    return current_data_;
  }

  static std::unique_ptr<ClipboardData> TakeCurrentData() {
    std::unique_ptr<ClipboardData> data = base::WrapUnique(GetCurrentData());
    current_data_ = nullptr;
    return data;
  }
  // This is a raw pointer instead of a std::unique_ptr to avoid adding a
  // static initializer.
  static ClipboardData* current_data_;
};

ClipboardData* ClipboardDataBuilder::current_data_ = nullptr;

}  // namespace

// Clipboard::FormatType implementation.
Clipboard::FormatType::FormatType() {
}

Clipboard::FormatType::FormatType(const std::string& native_format)
    : data_(native_format) {
}

Clipboard::FormatType::~FormatType() {
}

std::string Clipboard::FormatType::Serialize() const {
  return data_;
}

// static
Clipboard::FormatType Clipboard::FormatType::Deserialize(
    const std::string& serialization) {
  return FormatType(serialization);
}

bool Clipboard::FormatType::operator<(const FormatType& other) const {
  return data_ < other.data_;
}

bool Clipboard::FormatType::Equals(const FormatType& other) const {
  return data_ == other.data_;
}

// Various predefined FormatTypes.
// static
Clipboard::FormatType Clipboard::GetFormatType(
    const std::string& format_string) {
  return FormatType::Deserialize(format_string);
}

// static
const Clipboard::FormatType& Clipboard::GetUrlFormatType() {
  static base::NoDestructor<FormatType> type(kMimeTypeURIList);
  return *type;
}

// static
const Clipboard::FormatType& Clipboard::GetUrlWFormatType() {
  return GetUrlFormatType();
}

// static
const Clipboard::FormatType& Clipboard::GetMozUrlFormatType() {
  static base::NoDestructor<FormatType> type(kMimeTypeMozillaURL);
  return *type;
}

// static
const Clipboard::FormatType& Clipboard::GetPlainTextFormatType() {
  static base::NoDestructor<FormatType> type(kMimeTypeText);
  return *type;
}

// static
const Clipboard::FormatType& Clipboard::GetPlainTextWFormatType() {
  return GetPlainTextFormatType();
}

// static
const Clipboard::FormatType& Clipboard::GetFilenameFormatType() {
  static base::NoDestructor<FormatType> type(kMimeTypeFilename);
  return *type;
}

// static
const Clipboard::FormatType& Clipboard::GetFilenameWFormatType() {
  return Clipboard::GetFilenameFormatType();
}

// static
const Clipboard::FormatType& Clipboard::GetHtmlFormatType() {
  static base::NoDestructor<FormatType> type(kMimeTypeHTML);
  return *type;
}

// static
const Clipboard::FormatType& Clipboard::GetRtfFormatType() {
  static base::NoDestructor<FormatType> type(kMimeTypeRTF);
  return *type;
}

// static
const Clipboard::FormatType& Clipboard::GetBitmapFormatType() {
  static base::NoDestructor<FormatType> type(kMimeTypeBitmap);
  return *type;
}

// static
const Clipboard::FormatType& Clipboard::GetWebKitSmartPasteFormatType() {
  static base::NoDestructor<FormatType> type(kMimeTypeWebkitSmartPaste);
  return *type;
}

// static
const Clipboard::FormatType& Clipboard::GetWebCustomDataFormatType() {
  static base::NoDestructor<FormatType> type(kMimeTypeWebCustomData);
  return *type;
}

// static
const Clipboard::FormatType& Clipboard::GetPepperCustomDataFormatType() {
  static base::NoDestructor<FormatType> type(kMimeTypePepperCustomData);
  return *type;
}

// Clipboard factory method.
Clipboard* Clipboard::Create() {
  return new ClipboardAura;
}

// ClipboardAura implementation.
ClipboardAura::ClipboardAura() {
  DCHECK(CalledOnValidThread());
  // Make sure clipboard is created.
  GetClipboard();
}

ClipboardAura::~ClipboardAura() {
  DCHECK(CalledOnValidThread());
  DeleteClipboard();
}

void ClipboardAura::OnPreShutdown() {}

uint64_t ClipboardAura::GetSequenceNumber(ClipboardType type) const {
  DCHECK(CalledOnValidThread());
  return GetClipboard()->sequence_number();
}

bool ClipboardAura::IsFormatAvailable(const FormatType& format,
                                      ClipboardType type) const {
  DCHECK(CalledOnValidThread());
  DCHECK(IsSupportedClipboardType(type));
  AuraClipboard* clipboard = GetClipboard();
  if (GetPlainTextFormatType().Equals(format) ||
      GetUrlFormatType().Equals(format))
    return clipboard->IsFormatAvailable(TEXT);
  if (GetHtmlFormatType().Equals(format))
    return clipboard->IsFormatAvailable(HTML);
  if (GetRtfFormatType().Equals(format))
    return clipboard->IsFormatAvailable(RTF);
  if (GetBitmapFormatType().Equals(format))
    return clipboard->IsFormatAvailable(BITMAP);
  if (GetWebKitSmartPasteFormatType().Equals(format))
    return clipboard->IsFormatAvailable(WEB);
  const ClipboardData* data = clipboard->GetData();
  return data && data->custom_data_format() == format.ToString();
}

void ClipboardAura::Clear(ClipboardType type) {
  DCHECK(CalledOnValidThread());
  DCHECK(IsSupportedClipboardType(type));
  AuraClipboard* clipboard = GetClipboard();
  clipboard->Clear();
}

void ClipboardAura::ReadAvailableTypes(ClipboardType type,
                                       std::vector<base::string16>* types,
                                       bool* contains_filenames) const {
  DCHECK(CalledOnValidThread());
  if (!types || !contains_filenames) {
    NOTREACHED();
    return;
  }

  types->clear();
  *contains_filenames = false;
  if (IsFormatAvailable(GetPlainTextFormatType(), type))
    types->push_back(base::UTF8ToUTF16(GetPlainTextFormatType().ToString()));
  if (IsFormatAvailable(GetHtmlFormatType(), type))
    types->push_back(base::UTF8ToUTF16(GetHtmlFormatType().ToString()));
  if (IsFormatAvailable(GetRtfFormatType(), type))
    types->push_back(base::UTF8ToUTF16(GetRtfFormatType().ToString()));
  if (IsFormatAvailable(GetBitmapFormatType(), type))
    types->push_back(base::UTF8ToUTF16(kMimeTypePNG));

  AuraClipboard* clipboard = GetClipboard();
  if (clipboard->IsFormatAvailable(CUSTOM) && clipboard->GetData()) {
    ui::ReadCustomDataTypes(clipboard->GetData()->custom_data_data().c_str(),
        clipboard->GetData()->custom_data_data().size(), types);
  }
}

void ClipboardAura::ReadText(ClipboardType type, base::string16* result) const {
  DCHECK(CalledOnValidThread());
  GetClipboard()->ReadText(result);
}

void ClipboardAura::ReadAsciiText(ClipboardType type,
                                  std::string* result) const {
  DCHECK(CalledOnValidThread());
  GetClipboard()->ReadAsciiText(result);
}

void ClipboardAura::ReadHTML(ClipboardType type,
                             base::string16* markup,
                             std::string* src_url,
                             uint32_t* fragment_start,
                             uint32_t* fragment_end) const {
  DCHECK(CalledOnValidThread());
  GetClipboard()->ReadHTML(markup, src_url, fragment_start, fragment_end);
}

void ClipboardAura::ReadRTF(ClipboardType type, std::string* result) const {
  DCHECK(CalledOnValidThread());
  GetClipboard()->ReadRTF(result);
}

SkBitmap ClipboardAura::ReadImage(ClipboardType type) const {
  DCHECK(CalledOnValidThread());
  return GetClipboard()->ReadImage();
}

void ClipboardAura::ReadCustomData(ClipboardType clipboard_type,
                                   const base::string16& type,
                                   base::string16* result) const {
  DCHECK(CalledOnValidThread());
  GetClipboard()->ReadCustomData(type, result);
}

void ClipboardAura::ReadBookmark(base::string16* title,
                                 std::string* url) const {
  DCHECK(CalledOnValidThread());
  GetClipboard()->ReadBookmark(title, url);
}

void ClipboardAura::ReadData(const FormatType& format,
                             std::string* result) const {
  DCHECK(CalledOnValidThread());
  GetClipboard()->ReadData(format.ToString(), result);
}

void ClipboardAura::WriteObjects(ClipboardType type, const ObjectMap& objects) {
  DCHECK(CalledOnValidThread());
  DCHECK(IsSupportedClipboardType(type));
  for (const auto& object : objects)
    DispatchObject(static_cast<ObjectType>(object.first), object.second);
  ClipboardDataBuilder::CommitToClipboard();
}

void ClipboardAura::WriteText(const char* text_data, size_t text_len) {
  ClipboardDataBuilder::WriteText(text_data, text_len);
}

void ClipboardAura::WriteHTML(const char* markup_data,
                              size_t markup_len,
                              const char* url_data,
                              size_t url_len) {
  ClipboardDataBuilder::WriteHTML(markup_data, markup_len, url_data, url_len);
}

void ClipboardAura::WriteRTF(const char* rtf_data, size_t data_len) {
  ClipboardDataBuilder::WriteRTF(rtf_data, data_len);
}

void ClipboardAura::WriteBookmark(const char* title_data,
                                  size_t title_len,
                                  const char* url_data,
                                  size_t url_len) {
  ClipboardDataBuilder::WriteBookmark(title_data, title_len, url_data, url_len);
}

void ClipboardAura::WriteWebSmartPaste() {
  ClipboardDataBuilder::WriteWebSmartPaste();
}

void ClipboardAura::WriteBitmap(const SkBitmap& bitmap) {
  ClipboardDataBuilder::WriteBitmap(bitmap);
}

void ClipboardAura::WriteData(const FormatType& format,
                              const char* data_data,
                              size_t data_len) {
  ClipboardDataBuilder::WriteData(format.ToString(), data_data, data_len);
}

}  // namespace ui