Flutter Windows Embedder
platform_handler.cc
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1 // Copyright 2013 The Flutter 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 
6 
7 #include <windows.h>
8 
9 #include <cstring>
10 #include <optional>
11 
12 #include "flutter/fml/logging.h"
13 #include "flutter/fml/macros.h"
14 #include "flutter/fml/platform/win/wstring_conversion.h"
18 
19 static constexpr char kChannelName[] = "flutter/platform";
20 
21 static constexpr char kGetClipboardDataMethod[] = "Clipboard.getData";
22 static constexpr char kHasStringsClipboardMethod[] = "Clipboard.hasStrings";
23 static constexpr char kSetClipboardDataMethod[] = "Clipboard.setData";
24 static constexpr char kExitApplicationMethod[] = "System.exitApplication";
25 static constexpr char kRequestAppExitMethod[] = "System.requestAppExit";
26 static constexpr char kInitializationCompleteMethod[] =
27  "System.initializationComplete";
28 static constexpr char kPlaySoundMethod[] = "SystemSound.play";
29 
30 static constexpr char kExitCodeKey[] = "exitCode";
31 
32 static constexpr char kExitTypeKey[] = "type";
33 
34 static constexpr char kExitResponseKey[] = "response";
35 static constexpr char kExitResponseCancel[] = "cancel";
36 static constexpr char kExitResponseExit[] = "exit";
37 
38 static constexpr char kTextPlainFormat[] = "text/plain";
39 static constexpr char kTextKey[] = "text";
40 static constexpr char kUnknownClipboardFormatMessage[] =
41  "Unknown clipboard format";
42 
43 static constexpr char kValueKey[] = "value";
44 static constexpr int kAccessDeniedErrorCode = 5;
45 static constexpr int kErrorSuccess = 0;
46 
47 static constexpr char kExitRequestError[] = "ExitApplication error";
48 static constexpr char kInvalidExitRequestMessage[] =
49  "Invalid application exit request";
50 
51 namespace flutter {
52 
53 namespace {
54 
55 // A scoped wrapper for GlobalAlloc/GlobalFree.
56 class ScopedGlobalMemory {
57  public:
58  // Allocates |bytes| bytes of global memory with the given flags.
59  ScopedGlobalMemory(unsigned int flags, size_t bytes) {
60  memory_ = ::GlobalAlloc(flags, bytes);
61  if (!memory_) {
62  FML_LOG(ERROR) << "Unable to allocate global memory: "
63  << ::GetLastError();
64  }
65  }
66 
67  ~ScopedGlobalMemory() {
68  if (memory_) {
69  if (::GlobalFree(memory_) != nullptr) {
70  FML_LOG(ERROR) << "Failed to free global allocation: "
71  << ::GetLastError();
72  }
73  }
74  }
75 
76  // Returns the memory pointer, which will be nullptr if allocation failed.
77  void* get() { return memory_; }
78 
79  void* release() {
80  void* memory = memory_;
81  memory_ = nullptr;
82  return memory;
83  }
84 
85  private:
86  HGLOBAL memory_;
87 
88  FML_DISALLOW_COPY_AND_ASSIGN(ScopedGlobalMemory);
89 };
90 
91 // A scoped wrapper for GlobalLock/GlobalUnlock.
92 class ScopedGlobalLock {
93  public:
94  // Attempts to acquire a global lock on |memory| for the life of this object.
95  ScopedGlobalLock(HGLOBAL memory) {
96  source_ = memory;
97  if (memory) {
98  locked_memory_ = ::GlobalLock(memory);
99  if (!locked_memory_) {
100  FML_LOG(ERROR) << "Unable to acquire global lock: " << ::GetLastError();
101  }
102  }
103  }
104 
105  ~ScopedGlobalLock() {
106  if (locked_memory_) {
107  if (!::GlobalUnlock(source_)) {
108  DWORD error = ::GetLastError();
109  if (error != NO_ERROR) {
110  FML_LOG(ERROR) << "Unable to release global lock: "
111  << ::GetLastError();
112  }
113  }
114  }
115  }
116 
117  // Returns the locked memory pointer, which will be nullptr if acquiring the
118  // lock failed.
119  void* get() { return locked_memory_; }
120 
121  private:
122  HGLOBAL source_;
123  void* locked_memory_;
124 
125  FML_DISALLOW_COPY_AND_ASSIGN(ScopedGlobalLock);
126 };
127 
128 // A Clipboard wrapper that automatically closes the clipboard when it goes out
129 // of scope.
130 class ScopedClipboard : public ScopedClipboardInterface {
131  public:
132  ScopedClipboard();
133  virtual ~ScopedClipboard();
134 
135  int Open(HWND window) override;
136 
137  bool HasString() override;
138 
139  std::variant<std::wstring, int> GetString() override;
140 
141  int SetString(const std::wstring string) override;
142 
143  private:
144  bool opened_ = false;
145 
146  FML_DISALLOW_COPY_AND_ASSIGN(ScopedClipboard);
147 };
148 
149 ScopedClipboard::ScopedClipboard() {}
150 
151 ScopedClipboard::~ScopedClipboard() {
152  if (opened_) {
153  ::CloseClipboard();
154  }
155 }
156 
157 int ScopedClipboard::Open(HWND window) {
158  opened_ = ::OpenClipboard(window);
159 
160  if (!opened_) {
161  return ::GetLastError();
162  }
163 
164  return kErrorSuccess;
165 }
166 
167 bool ScopedClipboard::HasString() {
168  // Allow either plain text format, since getting data will auto-interpolate.
169  return ::IsClipboardFormatAvailable(CF_UNICODETEXT) ||
170  ::IsClipboardFormatAvailable(CF_TEXT);
171 }
172 
173 std::variant<std::wstring, int> ScopedClipboard::GetString() {
174  FML_DCHECK(opened_) << "Called GetString when clipboard is closed";
175 
176  HANDLE data = ::GetClipboardData(CF_UNICODETEXT);
177  if (data == nullptr) {
178  return ::GetLastError();
179  }
180  ScopedGlobalLock locked_data(data);
181 
182  if (!locked_data.get()) {
183  return ::GetLastError();
184  }
185  return static_cast<wchar_t*>(locked_data.get());
186 }
187 
188 int ScopedClipboard::SetString(const std::wstring string) {
189  FML_DCHECK(opened_) << "Called GetString when clipboard is closed";
190  if (!::EmptyClipboard()) {
191  return ::GetLastError();
192  }
193  size_t null_terminated_byte_count =
194  sizeof(decltype(string)::traits_type::char_type) * (string.size() + 1);
195  ScopedGlobalMemory destination_memory(GMEM_MOVEABLE,
196  null_terminated_byte_count);
197  ScopedGlobalLock locked_memory(destination_memory.get());
198  if (!locked_memory.get()) {
199  return ::GetLastError();
200  }
201  memcpy(locked_memory.get(), string.c_str(), null_terminated_byte_count);
202  if (!::SetClipboardData(CF_UNICODETEXT, locked_memory.get())) {
203  return ::GetLastError();
204  }
205  // The clipboard now owns the global memory.
206  destination_memory.release();
207  return kErrorSuccess;
208 }
209 
210 } // namespace
211 
212 static AppExitType StringToAppExitType(const std::string& string) {
213  if (string.compare(PlatformHandler::kExitTypeRequired) == 0) {
214  return AppExitType::required;
215  } else if (string.compare(PlatformHandler::kExitTypeCancelable) == 0) {
217  }
218  FML_LOG(ERROR) << string << " is not recognized as a valid exit type.";
219  return AppExitType::required;
220 }
221 
223  BinaryMessenger* messenger,
224  FlutterWindowsEngine* engine,
225  std::optional<std::function<std::unique_ptr<ScopedClipboardInterface>()>>
226  scoped_clipboard_provider)
227  : channel_(std::make_unique<MethodChannel<rapidjson::Document>>(
228  messenger,
229  kChannelName,
230  &JsonMethodCodec::GetInstance())),
231  engine_(engine) {
232  channel_->SetMethodCallHandler(
233  [this](const MethodCall<rapidjson::Document>& call,
234  std::unique_ptr<MethodResult<rapidjson::Document>> result) {
235  HandleMethodCall(call, std::move(result));
236  });
237  if (scoped_clipboard_provider.has_value()) {
238  scoped_clipboard_provider_ = scoped_clipboard_provider.value();
239  } else {
240  scoped_clipboard_provider_ = []() {
241  return std::make_unique<ScopedClipboard>();
242  };
243  }
244 }
245 
247 
249  std::unique_ptr<MethodResult<rapidjson::Document>> result,
250  std::string_view key) {
251  // TODO(loicsharma): Remove implicit view assumption.
252  // https://github.com/flutter/flutter/issues/142845
253  const FlutterWindowsView* view = engine_->view(kImplicitViewId);
254  if (view == nullptr) {
255  result->Error(kClipboardError,
256  "Clipboard is not available in Windows headless mode");
257  return;
258  }
259 
260  std::unique_ptr<ScopedClipboardInterface> clipboard =
261  scoped_clipboard_provider_();
262 
263  int open_result = clipboard->Open(view->GetWindowHandle());
264  if (open_result != kErrorSuccess) {
265  rapidjson::Document error_code;
266  error_code.SetInt(open_result);
267  result->Error(kClipboardError, "Unable to open clipboard", error_code);
268  return;
269  }
270  if (!clipboard->HasString()) {
271  result->Success(rapidjson::Document());
272  return;
273  }
274  std::variant<std::wstring, int> get_string_result = clipboard->GetString();
275  if (std::holds_alternative<int>(get_string_result)) {
276  rapidjson::Document error_code;
277  error_code.SetInt(std::get<int>(get_string_result));
278  result->Error(kClipboardError, "Unable to get clipboard data", error_code);
279  return;
280  }
281 
282  rapidjson::Document document;
283  document.SetObject();
284  rapidjson::Document::AllocatorType& allocator = document.GetAllocator();
285  document.AddMember(
286  rapidjson::Value(key.data(), allocator),
287  rapidjson::Value(
288  fml::WideStringToUtf8(std::get<std::wstring>(get_string_result)),
289  allocator),
290  allocator);
291  result->Success(document);
292 }
293 
295  std::unique_ptr<MethodResult<rapidjson::Document>> result) {
296  // TODO(loicsharma): Remove implicit view assumption.
297  // https://github.com/flutter/flutter/issues/142845
298  const FlutterWindowsView* view = engine_->view(kImplicitViewId);
299  if (view == nullptr) {
300  result->Error(kClipboardError,
301  "Clipboard is not available in Windows headless mode");
302  return;
303  }
304 
305  std::unique_ptr<ScopedClipboardInterface> clipboard =
306  scoped_clipboard_provider_();
307 
308  bool hasStrings;
309  int open_result = clipboard->Open(view->GetWindowHandle());
310  if (open_result != kErrorSuccess) {
311  // Swallow errors of type ERROR_ACCESS_DENIED. These happen when the app is
312  // not in the foreground and GetHasStrings is irrelevant.
313  // See https://github.com/flutter/flutter/issues/95817.
314  if (open_result != kAccessDeniedErrorCode) {
315  rapidjson::Document error_code;
316  error_code.SetInt(open_result);
317  result->Error(kClipboardError, "Unable to open clipboard", error_code);
318  return;
319  }
320  hasStrings = false;
321  } else {
322  hasStrings = clipboard->HasString();
323  }
324 
325  rapidjson::Document document;
326  document.SetObject();
327  rapidjson::Document::AllocatorType& allocator = document.GetAllocator();
328  document.AddMember(rapidjson::Value(kValueKey, allocator),
329  rapidjson::Value(hasStrings), allocator);
330  result->Success(document);
331 }
332 
334  const std::string& text,
335  std::unique_ptr<MethodResult<rapidjson::Document>> result) {
336  // TODO(loicsharma): Remove implicit view assumption.
337  // https://github.com/flutter/flutter/issues/142845
338  const FlutterWindowsView* view = engine_->view(kImplicitViewId);
339  if (view == nullptr) {
340  result->Error(kClipboardError,
341  "Clipboard is not available in Windows headless mode");
342  return;
343  }
344 
345  std::unique_ptr<ScopedClipboardInterface> clipboard =
346  scoped_clipboard_provider_();
347 
348  int open_result = clipboard->Open(view->GetWindowHandle());
349  if (open_result != kErrorSuccess) {
350  rapidjson::Document error_code;
351  error_code.SetInt(open_result);
352  result->Error(kClipboardError, "Unable to open clipboard", error_code);
353  return;
354  }
355  int set_result = clipboard->SetString(fml::Utf8ToWideString(text));
356  if (set_result != kErrorSuccess) {
357  rapidjson::Document error_code;
358  error_code.SetInt(set_result);
359  result->Error(kClipboardError, "Unable to set clipboard data", error_code);
360  return;
361  }
362  result->Success();
363 }
364 
366  const std::string& sound_type,
367  std::unique_ptr<MethodResult<rapidjson::Document>> result) {
368  if (sound_type.compare(kSoundTypeAlert) == 0) {
369  MessageBeep(MB_OK);
370  result->Success();
371  } else {
372  result->NotImplemented();
373  }
374 }
375 
377  AppExitType exit_type,
378  UINT exit_code,
379  std::unique_ptr<MethodResult<rapidjson::Document>> result) {
380  rapidjson::Document result_doc;
381  result_doc.SetObject();
382  if (exit_type == AppExitType::required) {
383  QuitApplication(std::nullopt, std::nullopt, std::nullopt, exit_code);
384  result_doc.GetObjectW().AddMember(kExitResponseKey, kExitResponseExit,
385  result_doc.GetAllocator());
386  result->Success(result_doc);
387  } else {
388  RequestAppExit(std::nullopt, std::nullopt, std::nullopt, exit_type,
389  exit_code);
390  result_doc.GetObjectW().AddMember(kExitResponseKey, kExitResponseCancel,
391  result_doc.GetAllocator());
392  result->Success(result_doc);
393  }
394 }
395 
396 // Indicates whether an exit request may be canceled by the framework.
397 // These values must be kept in sync with ExitType in platform_handler.h
398 static constexpr const char* kExitTypeNames[] = {
400 
401 void PlatformHandler::RequestAppExit(std::optional<HWND> hwnd,
402  std::optional<WPARAM> wparam,
403  std::optional<LPARAM> lparam,
404  AppExitType exit_type,
405  UINT exit_code) {
406  auto callback = std::make_unique<MethodResultFunctions<rapidjson::Document>>(
407  [this, exit_code, hwnd, wparam,
408  lparam](const rapidjson::Document* response) {
409  RequestAppExitSuccess(hwnd, wparam, lparam, response, exit_code);
410  },
411  nullptr, nullptr);
412  auto args = std::make_unique<rapidjson::Document>();
413  args->SetObject();
414  args->GetObjectW().AddMember(
415  kExitTypeKey, std::string(kExitTypeNames[static_cast<int>(exit_type)]),
416  args->GetAllocator());
417  channel_->InvokeMethod(kRequestAppExitMethod, std::move(args),
418  std::move(callback));
419 }
420 
421 void PlatformHandler::RequestAppExitSuccess(std::optional<HWND> hwnd,
422  std::optional<WPARAM> wparam,
423  std::optional<LPARAM> lparam,
424  const rapidjson::Document* result,
425  UINT exit_code) {
426  rapidjson::Value::ConstMemberIterator itr =
427  result->FindMember(kExitResponseKey);
428  if (itr == result->MemberEnd() || !itr->value.IsString()) {
429  FML_LOG(ERROR) << "Application request response did not contain a valid "
430  "response value";
431  return;
432  }
433  const std::string& exit_type = itr->value.GetString();
434 
435  if (exit_type.compare(kExitResponseExit) == 0) {
436  QuitApplication(hwnd, wparam, lparam, exit_code);
437  }
438 }
439 
440 void PlatformHandler::QuitApplication(std::optional<HWND> hwnd,
441  std::optional<WPARAM> wparam,
442  std::optional<LPARAM> lparam,
443  UINT exit_code) {
444  engine_->OnQuit(hwnd, wparam, lparam, exit_code);
445 }
446 
447 void PlatformHandler::HandleMethodCall(
448  const MethodCall<rapidjson::Document>& method_call,
449  std::unique_ptr<MethodResult<rapidjson::Document>> result) {
450  const std::string& method = method_call.method_name();
451  if (method.compare(kExitApplicationMethod) == 0) {
452  const rapidjson::Value& arguments = method_call.arguments()[0];
453 
454  rapidjson::Value::ConstMemberIterator itr =
455  arguments.FindMember(kExitTypeKey);
456  if (itr == arguments.MemberEnd() || !itr->value.IsString()) {
458  return;
459  }
460  const std::string& exit_type = itr->value.GetString();
461 
462  itr = arguments.FindMember(kExitCodeKey);
463  if (itr == arguments.MemberEnd() || !itr->value.IsInt()) {
465  return;
466  }
467  UINT exit_code = arguments[kExitCodeKey].GetInt();
468 
469  SystemExitApplication(StringToAppExitType(exit_type), exit_code,
470  std::move(result));
471  } else if (method.compare(kGetClipboardDataMethod) == 0) {
472  // Only one string argument is expected.
473  const rapidjson::Value& format = method_call.arguments()[0];
474 
475  if (strcmp(format.GetString(), kTextPlainFormat) != 0) {
477  return;
478  }
479  GetPlainText(std::move(result), kTextKey);
480  } else if (method.compare(kHasStringsClipboardMethod) == 0) {
481  // Only one string argument is expected.
482  const rapidjson::Value& format = method_call.arguments()[0];
483 
484  if (strcmp(format.GetString(), kTextPlainFormat) != 0) {
486  return;
487  }
488  GetHasStrings(std::move(result));
489  } else if (method.compare(kSetClipboardDataMethod) == 0) {
490  const rapidjson::Value& document = *method_call.arguments();
491  rapidjson::Value::ConstMemberIterator itr = document.FindMember(kTextKey);
492  if (itr == document.MemberEnd()) {
494  return;
495  }
496  if (!itr->value.IsString()) {
498  return;
499  }
500  SetPlainText(itr->value.GetString(), std::move(result));
501  } else if (method.compare(kPlaySoundMethod) == 0) {
502  // Only one string argument is expected.
503  const rapidjson::Value& sound_type = method_call.arguments()[0];
504 
505  SystemSoundPlay(sound_type.GetString(), std::move(result));
506  } else if (method.compare(kInitializationCompleteMethod) == 0) {
507  // Deprecated but should not cause an error.
508  result->Success();
509  } else {
510  result->NotImplemented();
511  }
512 }
513 
514 } // namespace flutter
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virtual void SystemExitApplication(AppExitType exit_type, UINT exit_code, std::unique_ptr< MethodResult< rapidjson::Document >> result)
Definition: platform_handler.cc:376
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constexpr FlutterViewId kImplicitViewId
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virtual void SystemSoundPlay(const std::string &sound_type, std::unique_ptr< MethodResult< rapidjson::Document >> result)
Definition: platform_handler.cc:365
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static constexpr char kValueKey[]
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static constexpr char kGetClipboardDataMethod[]
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static constexpr char kExitRequestError[]
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static constexpr char kInvalidExitRequestMessage[]
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Definition: flutter_windows_engine.h:90
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virtual void QuitApplication(std::optional< HWND > hwnd, std::optional< WPARAM > wparam, std::optional< LPARAM > lparam, UINT exit_code)
Definition: platform_handler.cc:440
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Definition: flutter_windows_engine.cc:946
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virtual void SetPlainText(const std::string &text, std::unique_ptr< MethodResult< rapidjson::Document >> result)
Definition: platform_handler.cc:333
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static constexpr char kExitApplicationMethod[]
Definition: platform_handler.cc:24
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virtual HWND GetWindowHandle() const
Definition: flutter_windows_view.cc:758
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static constexpr char kExitTypeRequired[]
Definition: platform_handler.h:45
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static constexpr char kExitCodeKey[]
Definition: platform_handler.cc:30
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static constexpr char kRequestAppExitMethod[]
Definition: platform_handler.cc:25
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virtual void RequestAppExit(std::optional< HWND > hwnd, std::optional< WPARAM > wparam, std::optional< LPARAM > lparam, AppExitType exit_type, UINT exit_code)
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Definition: binary_messenger.h:28
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static constexpr char kInitializationCompleteMethod[]
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static constexpr char kExitTypeCancelable[]
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static constexpr char kClipboardError[]
Definition: platform_handler.h:104
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static constexpr char kExitResponseKey[]
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static constexpr char kChannelName[]
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static constexpr int kErrorSuccess
Definition: platform_handler.cc:45
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static constexpr char kTextPlainFormat[]
Definition: platform_handler.cc:38
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static constexpr char kHasStringsClipboardMethod[]
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static constexpr char kPlaySoundMethod[]
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static constexpr char kTextKey[]
Definition: platform_handler.cc:39
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const std::string & method_name() const
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virtual void GetHasStrings(std::unique_ptr< MethodResult< rapidjson::Document >> result)
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static AppExitType StringToAppExitType(const std::string &string)
Definition: platform_handler.cc:212
kExitResponseExit
static constexpr char kExitResponseExit[]
Definition: platform_handler.cc:36
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static constexpr char kSetClipboardDataMethod[]
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static constexpr const char * kExitTypeNames[]
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static constexpr int kAccessDeniedErrorCode
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virtual void RequestAppExitSuccess(std::optional< HWND > hwnd, std::optional< WPARAM > wparam, std::optional< LPARAM > lparam, const rapidjson::Document *result, UINT exit_code)
Definition: platform_handler.cc:421
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static constexpr char kSoundTypeAlert[]
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virtual void GetPlainText(std::unique_ptr< MethodResult< rapidjson::Document >> result, std::string_view key)
Definition: platform_handler.cc:248
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static constexpr char kUnknownClipboardFormatMessage[]
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const T * arguments() const
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static constexpr char kExitResponseCancel[]
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static constexpr char kExitTypeKey[]
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