Index: extensions/renderer/api_last_error.cc |
diff --git a/extensions/renderer/api_last_error.cc b/extensions/renderer/api_last_error.cc |
new file mode 100644 |
index 0000000000000000000000000000000000000000..2dafc5e16a2446b916eb904a503d8939f9b6729f |
--- /dev/null |
+++ b/extensions/renderer/api_last_error.cc |
@@ -0,0 +1,149 @@ |
+// Copyright 2017 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 "extensions/renderer/api_last_error.h" |
+ |
+#include "gin/converter.h" |
+#include "gin/handle.h" |
+#include "gin/object_template_builder.h" |
+#include "gin/wrappable.h" |
+ |
+namespace extensions { |
+ |
+namespace { |
+ |
+const char kLastErrorProperty[] = "lastError"; |
+ |
+class LastErrorObject final : public gin::Wrappable<LastErrorObject> { |
+ public: |
+ explicit LastErrorObject(const std::string& error) : error_(error) {} |
+ |
+ static gin::WrapperInfo kWrapperInfo; |
+ |
+ // gin::Wrappable: |
+ gin::ObjectTemplateBuilder GetObjectTemplateBuilder( |
+ v8::Isolate* isolate) override { |
+ DCHECK(isolate); |
+ return Wrappable<LastErrorObject>::GetObjectTemplateBuilder(isolate) |
+ .SetProperty("message", &LastErrorObject::GetLastError); |
+ } |
+ |
+ void Reset(const std::string& error) { |
+ error_ = error; |
+ accessed_ = false; |
+ } |
+ |
+ const std::string& error() const { return error_; } |
+ bool accessed() const { return accessed_; } |
+ |
+ private: |
+ std::string GetLastError() { |
+ accessed_ = true; |
+ return error_; |
+ } |
+ |
+ std::string error_; |
+ bool accessed_ = false; |
+ |
+ DISALLOW_COPY_AND_ASSIGN(LastErrorObject); |
+}; |
+ |
+gin::WrapperInfo LastErrorObject::kWrapperInfo = {gin::kEmbedderNativeGin}; |
+ |
+} // namespace |
+ |
+APILastError::APILastError(const GetParent& get_parent) |
+ : get_parent_(get_parent) {} |
+APILastError::APILastError(APILastError&& other) = default; |
+APILastError::~APILastError() = default; |
+ |
+void APILastError::SetError(v8::Local<v8::Context> context, |
+ const std::string& error) { |
+ v8::Isolate* isolate = context->GetIsolate(); |
+ DCHECK(isolate); |
+ v8::HandleScope handle_scope(isolate); |
+ |
+ // The various accesses/sets on an object could potentially fail if script has |
+ // set any crazy interceptors. For the most part, we don't care about behaving |
+ // perfectly in these circumstances, but we eat the exception so callers don't |
+ // have to worry about it. We also SetVerbose() so that developers will have a |
+ // clue what happened if this does arise. |
+ // TODO(devlin): Whether or not this needs to be verbose is debatable. |
+ v8::TryCatch try_catch(isolate); |
+ try_catch.SetVerbose(true); |
+ |
+ v8::Local<v8::Object> parent = get_parent_.Run(context); |
+ if (parent.IsEmpty()) |
+ return; |
+ v8::Local<v8::String> key = gin::StringToSymbol(isolate, kLastErrorProperty); |
+ v8::Local<v8::Value> v8_error; |
+ if (!parent->Get(context, key).ToLocal(&v8_error)) |
+ return; |
+ |
+ if (!v8_error->IsUndefined()) { |
+ // There may be an existing last error to overwrite. |
+ LastErrorObject* last_error = nullptr; |
+ if (!gin::Converter<LastErrorObject*>::FromV8(context->GetIsolate(), |
+ v8_error, &last_error)) { |
+ // If it's not a real lastError (e.g. if a script manually set it), don't |
+ // do anything. We shouldn't mangle a property set by other script. |
+ // TODO(devlin): Or should we? If someone sets chrome.runtime.lastError, |
+ // it might be the right course of action to overwrite it. |
+ return; |
+ } |
+ last_error->Reset(error); |
+ } else { |
+ DCHECK(context->GetIsolate()); |
+ v8::Local<v8::Value> last_error = |
+ gin::CreateHandle(context->GetIsolate(), new LastErrorObject(error)) |
+ .ToV8(); |
+ DCHECK(!last_error.IsEmpty()); |
+ // This Set() can fail, but there's nothing to do if it does (the exception |
+ // will be caught by the TryCatch above). |
+ ignore_result(parent->Set( |
+ context, gin::StringToSymbol(isolate, kLastErrorProperty), last_error)); |
+ } |
+} |
+ |
+void APILastError::ClearError(v8::Local<v8::Context> context, |
+ bool report_if_unchecked) { |
+ v8::Isolate* isolate = context->GetIsolate(); |
+ v8::HandleScope handle_scope(isolate); |
+ |
+ v8::Local<v8::Object> parent; |
+ LastErrorObject* last_error = nullptr; |
+ v8::Local<v8::String> key; |
+ { |
+ // See comment in SetError(). |
+ v8::TryCatch try_catch(isolate); |
+ try_catch.SetVerbose(true); |
+ |
+ parent = get_parent_.Run(context); |
+ if (parent.IsEmpty()) |
+ return; |
+ key = gin::StringToSymbol(isolate, kLastErrorProperty); |
+ v8::Local<v8::Value> error; |
+ if (!parent->Get(context, key).ToLocal(&error)) |
+ return; |
+ if (!gin::Converter<LastErrorObject*>::FromV8(context->GetIsolate(), error, |
+ &last_error)) { |
+ return; |
+ } |
+ } |
+ |
+ if (report_if_unchecked && !last_error->accessed()) { |
+ isolate->ThrowException( |
+ v8::Exception::Error(gin::StringToV8(isolate, last_error->error()))); |
+ } |
+ |
+ // See comment in SetError(). |
+ v8::TryCatch try_catch(isolate); |
+ try_catch.SetVerbose(true); |
+ |
+ // This Delete() can fail, but there's nothing to do if it does (the exception |
+ // will be caught by the TryCatch above). |
+ parent->Delete(context, key); |
+} |
+ |
+} // namespace extensions |