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      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.
      4 
      5 #include "ui/base/clipboard/clipboard.h"
      6 
      7 #include "base/android/jni_string.h"
      8 #include "base/lazy_instance.h"
      9 #include "base/stl_util.h"
     10 #include "base/strings/utf_string_conversions.h"
     11 #include "base/synchronization/lock.h"
     12 #include "jni/Clipboard_jni.h"
     13 #include "third_party/skia/include/core/SkBitmap.h"
     14 #include "ui/base/clipboard/clipboard_android_initialization.h"
     15 #include "ui/gfx/size.h"
     16 
     17 // TODO:(andrewhayden) Support additional formats in Android: Bitmap, URI, HTML,
     18 // HTML+text now that Android's clipboard system supports them, then nuke the
     19 // legacy implementation note below.
     20 
     21 // Legacy implementation note:
     22 // The Android clipboard system used to only support text format. So we used the
     23 // Android system when some text was added or retrieved from the system. For
     24 // anything else, we STILL store the value in some process wide static
     25 // variable protected by a lock. So the (non-text) clipboard will only work
     26 // within the same process.
     27 
     28 using base::android::AttachCurrentThread;
     29 using base::android::ClearException;
     30 using base::android::ConvertJavaStringToUTF8;
     31 using base::android::ConvertUTF8ToJavaString;
     32 using base::android::ScopedJavaGlobalRef;
     33 using base::android::ScopedJavaLocalRef;
     34 
     35 namespace ui {
     36 
     37 namespace {
     38 // Various formats we support.
     39 const char kPlainTextFormat[] = "text";
     40 const char kHTMLFormat[] = "html";
     41 const char kRTFFormat[] = "rtf";
     42 const char kBitmapFormat[] = "bitmap";
     43 const char kWebKitSmartPasteFormat[] = "webkit_smart";
     44 const char kBookmarkFormat[] = "bookmark";
     45 const char kMimeTypePepperCustomData[] = "chromium/x-pepper-custom-data";
     46 const char kMimeTypeWebCustomData[] = "chromium/x-web-custom-data";
     47 
     48 class ClipboardMap {
     49  public:
     50   ClipboardMap();
     51   std::string Get(const std::string& format);
     52   bool HasFormat(const std::string& format);
     53   void Set(const std::string& format, const std::string& data);
     54   void Clear();
     55 
     56  private:
     57   void SyncWithAndroidClipboard();
     58   std::map<std::string, std::string> map_;
     59   base::Lock lock_;
     60 
     61   // Java class and methods for the Android ClipboardManager.
     62   ScopedJavaGlobalRef<jobject> clipboard_manager_;
     63 };
     64 base::LazyInstance<ClipboardMap>::Leaky g_map = LAZY_INSTANCE_INITIALIZER;
     65 
     66 ClipboardMap::ClipboardMap() {
     67   JNIEnv* env = AttachCurrentThread();
     68   DCHECK(env);
     69 
     70   // Get the context.
     71   jobject context = base::android::GetApplicationContext();
     72   DCHECK(context);
     73 
     74   ScopedJavaLocalRef<jobject> local_ref =
     75       Java_Clipboard_create(env, context);
     76   DCHECK(local_ref.obj());
     77   clipboard_manager_.Reset(env, local_ref.Release());
     78 }
     79 
     80 std::string ClipboardMap::Get(const std::string& format) {
     81   base::AutoLock lock(lock_);
     82   SyncWithAndroidClipboard();
     83   std::map<std::string, std::string>::const_iterator it = map_.find(format);
     84   return it == map_.end() ? std::string() : it->second;
     85 }
     86 
     87 bool ClipboardMap::HasFormat(const std::string& format) {
     88   base::AutoLock lock(lock_);
     89   SyncWithAndroidClipboard();
     90   return ContainsKey(map_, format);
     91 }
     92 
     93 void ClipboardMap::Set(const std::string& format, const std::string& data) {
     94   JNIEnv* env = AttachCurrentThread();
     95   base::AutoLock lock(lock_);
     96   SyncWithAndroidClipboard();
     97 
     98   map_[format] = data;
     99   if (format == kPlainTextFormat) {
    100     ScopedJavaLocalRef<jstring> str = ConvertUTF8ToJavaString(env, data);
    101     DCHECK(str.obj());
    102 
    103     Java_Clipboard_setText(env, clipboard_manager_.obj(), str.obj());
    104   } else if (format == kHTMLFormat) {
    105     // Android's API for storing HTML content on the clipboard requires a plain-
    106     // text representation to be available as well. ScopedClipboardWriter has a
    107     // stable order for setting clipboard data, ensuring that plain-text data
    108     // is available first. Do not write to the clipboard when only HTML data is
    109     // available, because otherwise others apps may not be able to paste it.
    110     if (!ContainsKey(map_, kPlainTextFormat))
    111       return;
    112 
    113     ScopedJavaLocalRef<jstring> html = ConvertUTF8ToJavaString(env, data);
    114     ScopedJavaLocalRef<jstring> text = ConvertUTF8ToJavaString(
    115         env, map_[kPlainTextFormat].c_str());
    116 
    117     DCHECK(html.obj() && text.obj());
    118     Java_Clipboard_setHTMLText(
    119         env, clipboard_manager_.obj(), html.obj(), text.obj());
    120   }
    121 }
    122 
    123 void ClipboardMap::Clear() {
    124   JNIEnv* env = AttachCurrentThread();
    125   base::AutoLock lock(lock_);
    126   map_.clear();
    127   Java_Clipboard_setText(env, clipboard_manager_.obj(), NULL);
    128 }
    129 
    130 // If the internal map contains a plain-text entry and it does not match that
    131 // in the Android clipboard, clear the map and insert the Android text into it.
    132 // If there is an HTML entry in the Android clipboard it gets inserted in the
    133 // map.
    134 void ClipboardMap::SyncWithAndroidClipboard() {
    135   lock_.AssertAcquired();
    136   JNIEnv* env = AttachCurrentThread();
    137 
    138   // Update the plain text clipboard entry
    139   std::map<std::string, std::string>::const_iterator it =
    140     map_.find(kPlainTextFormat);
    141   ScopedJavaLocalRef<jstring> java_string_text =
    142       Java_Clipboard_getCoercedText(env, clipboard_manager_.obj());
    143   if (java_string_text.obj()) {
    144     std::string android_string = ConvertJavaStringToUTF8(java_string_text);
    145     if (!android_string.empty() &&
    146         (it == map_.end() || it->second != android_string)) {
    147       // There is a different string in the Android clipboard than we have.
    148       // Clear the map on our side.
    149       map_.clear();
    150       map_[kPlainTextFormat] = android_string;
    151     }
    152   } else {
    153     if (it != map_.end()) {
    154       // We have plain text on this side, but Android doesn't. Nuke ours.
    155       map_.clear();
    156     }
    157   }
    158 
    159   if (!Java_Clipboard_isHTMLClipboardSupported(env)) {
    160     return;
    161   }
    162 
    163   // Update the html clipboard entry
    164   ScopedJavaLocalRef<jstring> java_string_html =
    165       Java_Clipboard_getHTMLText(env, clipboard_manager_.obj());
    166   if (java_string_html.obj()) {
    167     std::string android_string = ConvertJavaStringToUTF8(java_string_html);
    168     if (!android_string.empty()) {
    169       map_[kHTMLFormat] = android_string;
    170       return;
    171     }
    172   }
    173   it = map_.find(kHTMLFormat);
    174   if (it != map_.end()) {
    175     map_.erase(kHTMLFormat);
    176   }
    177 }
    178 
    179 }  // namespace
    180 
    181 Clipboard::FormatType::FormatType() {
    182 }
    183 
    184 Clipboard::FormatType::FormatType(const std::string& native_format)
    185     : data_(native_format) {
    186 }
    187 
    188 Clipboard::FormatType::~FormatType() {
    189 }
    190 
    191 std::string Clipboard::FormatType::Serialize() const {
    192   return data_;
    193 }
    194 
    195 // static
    196 Clipboard::FormatType Clipboard::FormatType::Deserialize(
    197     const std::string& serialization) {
    198   return FormatType(serialization);
    199 }
    200 
    201 bool Clipboard::FormatType::Equals(const FormatType& other) const {
    202   return data_ == other.data_;
    203 }
    204 
    205 Clipboard::Clipboard() {
    206   DCHECK(CalledOnValidThread());
    207 }
    208 
    209 Clipboard::~Clipboard() {
    210   DCHECK(CalledOnValidThread());
    211 }
    212 
    213 // Main entry point used to write several values in the clipboard.
    214 void Clipboard::WriteObjects(ClipboardType type, const ObjectMap& objects) {
    215   DCHECK(CalledOnValidThread());
    216   DCHECK_EQ(type, CLIPBOARD_TYPE_COPY_PASTE);
    217   g_map.Get().Clear();
    218   for (ObjectMap::const_iterator iter = objects.begin();
    219        iter != objects.end(); ++iter) {
    220     DispatchObject(static_cast<ObjectType>(iter->first), iter->second);
    221   }
    222 }
    223 
    224 uint64 Clipboard::GetSequenceNumber(ClipboardType /* type */) {
    225   DCHECK(CalledOnValidThread());
    226   // TODO: implement this. For now this interface will advertise
    227   // that the clipboard never changes. That's fine as long as we
    228   // don't rely on this signal.
    229   return 0;
    230 }
    231 
    232 bool Clipboard::IsFormatAvailable(const Clipboard::FormatType& format,
    233                                   ClipboardType type) const {
    234   DCHECK(CalledOnValidThread());
    235   DCHECK_EQ(type, CLIPBOARD_TYPE_COPY_PASTE);
    236   return g_map.Get().HasFormat(format.data());
    237 }
    238 
    239 void Clipboard::Clear(ClipboardType type) {
    240   DCHECK(CalledOnValidThread());
    241   DCHECK_EQ(type, CLIPBOARD_TYPE_COPY_PASTE);
    242   g_map.Get().Clear();
    243 }
    244 
    245 void Clipboard::ReadAvailableTypes(ClipboardType type,
    246                                    std::vector<base::string16>* types,
    247                                    bool* contains_filenames) const {
    248   DCHECK(CalledOnValidThread());
    249   DCHECK_EQ(type, CLIPBOARD_TYPE_COPY_PASTE);
    250 
    251   if (!types || !contains_filenames) {
    252     NOTREACHED();
    253     return;
    254   }
    255 
    256   NOTIMPLEMENTED();
    257 
    258   types->clear();
    259   *contains_filenames = false;
    260 }
    261 
    262 void Clipboard::ReadText(ClipboardType type, base::string16* result) const {
    263   DCHECK(CalledOnValidThread());
    264   DCHECK_EQ(type, CLIPBOARD_TYPE_COPY_PASTE);
    265   std::string utf8;
    266   ReadAsciiText(type, &utf8);
    267   *result = base::UTF8ToUTF16(utf8);
    268 }
    269 
    270 void Clipboard::ReadAsciiText(ClipboardType type, std::string* result) const {
    271   DCHECK(CalledOnValidThread());
    272   DCHECK_EQ(type, CLIPBOARD_TYPE_COPY_PASTE);
    273   *result = g_map.Get().Get(kPlainTextFormat);
    274 }
    275 
    276 // Note: |src_url| isn't really used. It is only implemented in Windows
    277 void Clipboard::ReadHTML(ClipboardType type,
    278                          base::string16* markup,
    279                          std::string* src_url,
    280                          uint32* fragment_start,
    281                          uint32* fragment_end) const {
    282   DCHECK(CalledOnValidThread());
    283   DCHECK_EQ(type, CLIPBOARD_TYPE_COPY_PASTE);
    284   if (src_url)
    285     src_url->clear();
    286 
    287   std::string input = g_map.Get().Get(kHTMLFormat);
    288   *markup = base::UTF8ToUTF16(input);
    289 
    290   *fragment_start = 0;
    291   *fragment_end = static_cast<uint32>(markup->length());
    292 }
    293 
    294 void Clipboard::ReadRTF(ClipboardType type, std::string* result) const {
    295   DCHECK(CalledOnValidThread());
    296   NOTIMPLEMENTED();
    297 }
    298 
    299 SkBitmap Clipboard::ReadImage(ClipboardType type) const {
    300   DCHECK(CalledOnValidThread());
    301   DCHECK_EQ(type, CLIPBOARD_TYPE_COPY_PASTE);
    302   std::string input = g_map.Get().Get(kBitmapFormat);
    303 
    304   SkBitmap bmp;
    305   if (!input.empty()) {
    306     DCHECK_LE(sizeof(gfx::Size), input.size());
    307     const gfx::Size* size = reinterpret_cast<const gfx::Size*>(input.data());
    308 
    309     bmp.setConfig(SkBitmap::kARGB_8888_Config, size->width(), size->height());
    310     bmp.allocPixels();
    311 
    312     DCHECK_EQ(sizeof(gfx::Size) + bmp.getSize(), input.size());
    313 
    314     memcpy(bmp.getPixels(), input.data() + sizeof(gfx::Size), bmp.getSize());
    315   }
    316   return bmp;
    317 }
    318 
    319 void Clipboard::ReadCustomData(ClipboardType clipboard_type,
    320                                const base::string16& type,
    321                                base::string16* result) const {
    322   DCHECK(CalledOnValidThread());
    323   NOTIMPLEMENTED();
    324 }
    325 
    326 void Clipboard::ReadBookmark(base::string16* title, std::string* url) const {
    327   DCHECK(CalledOnValidThread());
    328   NOTIMPLEMENTED();
    329 }
    330 
    331 void Clipboard::ReadData(const Clipboard::FormatType& format,
    332                          std::string* result) const {
    333   DCHECK(CalledOnValidThread());
    334   *result = g_map.Get().Get(format.data());
    335 }
    336 
    337 // static
    338 Clipboard::FormatType Clipboard::GetFormatType(
    339     const std::string& format_string) {
    340   return FormatType::Deserialize(format_string);
    341 }
    342 
    343 // static
    344 const Clipboard::FormatType& Clipboard::GetPlainTextFormatType() {
    345   CR_DEFINE_STATIC_LOCAL(FormatType, type, (kPlainTextFormat));
    346   return type;
    347 }
    348 
    349 // static
    350 const Clipboard::FormatType& Clipboard::GetPlainTextWFormatType() {
    351   CR_DEFINE_STATIC_LOCAL(FormatType, type, (kPlainTextFormat));
    352   return type;
    353 }
    354 
    355 // static
    356 const Clipboard::FormatType& Clipboard::GetWebKitSmartPasteFormatType() {
    357   CR_DEFINE_STATIC_LOCAL(FormatType, type, (kWebKitSmartPasteFormat));
    358   return type;
    359 }
    360 
    361 // static
    362 const Clipboard::FormatType& Clipboard::GetHtmlFormatType() {
    363   CR_DEFINE_STATIC_LOCAL(FormatType, type, (kHTMLFormat));
    364   return type;
    365 }
    366 
    367 // static
    368 const Clipboard::FormatType& Clipboard::GetRtfFormatType() {
    369   CR_DEFINE_STATIC_LOCAL(FormatType, type, (kRTFFormat));
    370   return type;
    371 }
    372 
    373 // static
    374 const Clipboard::FormatType& Clipboard::GetBitmapFormatType() {
    375   CR_DEFINE_STATIC_LOCAL(FormatType, type, (kBitmapFormat));
    376   return type;
    377 }
    378 
    379 // static
    380 const Clipboard::FormatType& Clipboard::GetWebCustomDataFormatType() {
    381   CR_DEFINE_STATIC_LOCAL(FormatType, type, (kMimeTypeWebCustomData));
    382   return type;
    383 }
    384 
    385 // static
    386 const Clipboard::FormatType& Clipboard::GetPepperCustomDataFormatType() {
    387   CR_DEFINE_STATIC_LOCAL(FormatType, type, (kMimeTypePepperCustomData));
    388   return type;
    389 }
    390 
    391 void Clipboard::WriteText(const char* text_data, size_t text_len) {
    392   g_map.Get().Set(kPlainTextFormat, std::string(text_data, text_len));
    393 }
    394 
    395 void Clipboard::WriteHTML(const char* markup_data,
    396                           size_t markup_len,
    397                           const char* url_data,
    398                           size_t url_len) {
    399   g_map.Get().Set(kHTMLFormat, std::string(markup_data, markup_len));
    400 }
    401 
    402 void Clipboard::WriteRTF(const char* rtf_data, size_t data_len) {
    403   NOTIMPLEMENTED();
    404 }
    405 
    406 // Note: according to other platforms implementations, this really writes the
    407 // URL spec.
    408 void Clipboard::WriteBookmark(const char* title_data, size_t title_len,
    409                               const char* url_data, size_t url_len) {
    410   g_map.Get().Set(kBookmarkFormat, std::string(url_data, url_len));
    411 }
    412 
    413 // Write an extra flavor that signifies WebKit was the last to modify the
    414 // pasteboard. This flavor has no data.
    415 void Clipboard::WriteWebSmartPaste() {
    416   g_map.Get().Set(kWebKitSmartPasteFormat, std::string());
    417 }
    418 
    419 // Note: we implement this to pass all unit tests but it is currently unclear
    420 // how some code would consume this.
    421 void Clipboard::WriteBitmap(const SkBitmap& bitmap) {
    422   gfx::Size size(bitmap.width(), bitmap.height());
    423 
    424   std::string packed(reinterpret_cast<const char*>(&size), sizeof(size));
    425   {
    426     SkAutoLockPixels bitmap_lock(bitmap);
    427     packed += std::string(static_cast<const char*>(bitmap.getPixels()),
    428                           bitmap.getSize());
    429   }
    430   g_map.Get().Set(kBitmapFormat, packed);
    431 }
    432 
    433 void Clipboard::WriteData(const Clipboard::FormatType& format,
    434                           const char* data_data, size_t data_len) {
    435   g_map.Get().Set(format.data(), std::string(data_data, data_len));
    436 }
    437 
    438 // See clipboard_android_initialization.h for more information.
    439 bool RegisterClipboardAndroid(JNIEnv* env) {
    440   return RegisterNativesImpl(env);
    441 }
    442 
    443 } // namespace ui
    444