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1 // Copyright 2017 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 "extensions/renderer/api_last_error.h" | |
6 | |
7 #include "gin/converter.h" | |
8 #include "gin/handle.h" | |
9 #include "gin/object_template_builder.h" | |
10 #include "gin/wrappable.h" | |
11 | |
12 namespace extensions { | |
13 | |
14 namespace { | |
15 | |
16 const char kLastErrorProperty[] = "lastError"; | |
17 | |
18 class LastErrorObject final : public gin::Wrappable<LastErrorObject> { | |
19 public: | |
20 explicit LastErrorObject(const std::string& error) : error_(error) {} | |
21 | |
22 static gin::WrapperInfo kWrapperInfo; | |
23 | |
24 // gin::Wrappable: | |
25 gin::ObjectTemplateBuilder GetObjectTemplateBuilder( | |
26 v8::Isolate* isolate) override { | |
27 DCHECK(isolate); | |
28 return Wrappable<LastErrorObject>::GetObjectTemplateBuilder(isolate) | |
29 .SetProperty("message", &LastErrorObject::GetLastError); | |
30 } | |
31 | |
32 void Reset(const std::string& error) { | |
33 error_ = error; | |
34 accessed_ = false; | |
35 } | |
36 | |
37 const std::string& error() const { return error_; } | |
38 bool accessed() const { return accessed_; } | |
39 | |
40 private: | |
41 std::string GetLastError() { | |
42 accessed_ = true; | |
43 return error_; | |
44 } | |
45 | |
46 std::string error_; | |
47 bool accessed_ = false; | |
48 | |
49 DISALLOW_COPY_AND_ASSIGN(LastErrorObject); | |
50 }; | |
51 | |
52 gin::WrapperInfo LastErrorObject::kWrapperInfo = {gin::kEmbedderNativeGin}; | |
53 | |
54 } // namespace | |
55 | |
56 APILastError::APILastError(const GetParent& get_parent) | |
57 : get_parent_(get_parent) {} | |
58 APILastError::APILastError(APILastError&& other) = default; | |
59 APILastError::~APILastError() = default; | |
60 | |
61 void APILastError::SetError(v8::Local<v8::Context> context, | |
62 const std::string& error) { | |
63 v8::Isolate* isolate = context->GetIsolate(); | |
64 DCHECK(isolate); | |
65 v8::HandleScope handle_scope(isolate); | |
66 | |
67 // The various accesses/sets on an object could potentially fail if script has | |
68 // set any crazy interceptors. For the most part, we don't care about behaving | |
69 // perfectly in these circumstances, but we eat the exception so callers don't | |
70 // have to worry about it. We also SetVerbose() so that developers will have a | |
71 // clue what happened if this does arise. | |
72 // TODO(devlin): Whether or not this needs to be verbose is debatable. | |
73 v8::TryCatch try_catch(isolate); | |
74 try_catch.SetVerbose(true); | |
75 | |
76 v8::Local<v8::Object> parent = get_parent_.Run(context); | |
77 if (parent.IsEmpty()) | |
78 return; | |
79 v8::Local<v8::String> key = gin::StringToSymbol(isolate, kLastErrorProperty); | |
80 v8::MaybeLocal<v8::Value> maybe_error = parent->Get(context, key); | |
81 v8::Local<v8::Value> local_error; | |
82 if (!maybe_error.ToLocal(&local_error)) | |
jbroman
2017/02/13 19:41:27
nit: Don't have to, but it's usual to do the ToLoc
Devlin
2017/02/14 04:57:08
Whoops, been trying to do that more, but didn't he
| |
83 return; | |
84 | |
85 if (!local_error->IsUndefined()) { | |
86 // There may be an existing last error to overwrite. | |
87 LastErrorObject* last_error = nullptr; | |
88 if (!gin::Converter<LastErrorObject*>::FromV8(context->GetIsolate(), | |
89 local_error, &last_error)) { | |
90 // If it's not a real lastError (e.g. if a script manually set it), don't | |
91 // do anything. | |
92 return; | |
93 } | |
94 last_error->Reset(error); | |
95 } else { | |
96 DCHECK(context->GetIsolate()); | |
97 v8::Local<v8::Value> last_error = | |
98 gin::CreateHandle(context->GetIsolate(), new LastErrorObject(error)) | |
99 .ToV8(); | |
100 DCHECK(!last_error.IsEmpty()); | |
101 // This Set() can fail, but there's nothing to do if it does (the exception | |
102 // will be caught by the TryCatch above). | |
103 ignore_result(parent->Set( | |
104 context, gin::StringToSymbol(isolate, kLastErrorProperty), last_error)); | |
105 } | |
106 } | |
107 | |
108 void APILastError::ClearError(v8::Local<v8::Context> context, | |
109 bool report_if_unchecked) { | |
110 v8::Isolate* isolate = context->GetIsolate(); | |
111 v8::HandleScope handle_scope(isolate); | |
112 | |
113 v8::Local<v8::Object> parent; | |
114 LastErrorObject* last_error = nullptr; | |
115 v8::Local<v8::String> key; | |
116 { | |
117 // See comment in SetError(). | |
118 v8::TryCatch try_catch(isolate); | |
119 try_catch.SetVerbose(true); | |
120 | |
121 parent = get_parent_.Run(context); | |
122 if (parent.IsEmpty()) | |
123 return; | |
124 key = gin::StringToSymbol(isolate, kLastErrorProperty); | |
125 v8::MaybeLocal<v8::Value> maybe_error = parent->Get(context, key); | |
jbroman
2017/02/13 19:41:27
ditto here about ToLocal
Devlin
2017/02/14 04:57:08
Done.
| |
126 v8::Local<v8::Value> local_error; | |
127 if (!maybe_error.ToLocal(&local_error)) | |
128 return; | |
129 if (!gin::Converter<LastErrorObject*>::FromV8(context->GetIsolate(), | |
130 local_error, &last_error)) { | |
131 return; | |
132 } | |
133 } | |
134 | |
135 if (report_if_unchecked && !last_error->accessed()) { | |
136 isolate->ThrowException( | |
137 v8::Exception::Error(gin::StringToV8(isolate, last_error->error()))); | |
138 } | |
139 | |
140 // See comment in SetError(). | |
141 v8::TryCatch try_catch(isolate); | |
142 try_catch.SetVerbose(true); | |
143 | |
144 // This Delete() can fail, but there's nothing to do if it does (the exception | |
145 // will be caught by the TryCatch above). | |
146 parent->Delete(context, key); | |
147 } | |
148 | |
149 } // namespace extensions | |
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