1 // Copyright © 2021-present 650 Industries, Inc. (aka Expo)
2 
3 #include "JavaScriptModuleObject.h"
4 #include "JSIInteropModuleRegistry.h"
5 
6 #include <folly/dynamic.h>
7 #include <jsi/JSIDynamic.h>
8 #include <react/jni/ReadableNativeArray.h>
9 #include <fbjni/detail/Hybrid.h>
10 #include <ReactCommon/TurboModuleUtils.h>
11 #include <jni/JCallback.h>
12 #include <jsi/JSIDynamic.h>
13 #include <fbjni/fbjni.h>
14 #include <jsi/jsi.h>
15 
16 #include <utility>
17 #include <tuple>
18 #include <algorithm>
19 
20 namespace jni = facebook::jni;
21 namespace jsi = facebook::jsi;
22 namespace react = facebook::react;
23 
24 namespace expo {
25 
26 jni::local_ref<jni::HybridClass<JavaScriptModuleObject>::jhybriddata>
27 JavaScriptModuleObject::initHybrid(jni::alias_ref<jhybridobject> jThis) {
28   return makeCxxInstance(jThis);
29 }
30 
31 void JavaScriptModuleObject::registerNatives() {
32   registerHybrid({
33                    makeNativeMethod("initHybrid", JavaScriptModuleObject::initHybrid),
34                    makeNativeMethod("exportConstants", JavaScriptModuleObject::exportConstants),
35                    makeNativeMethod("registerSyncFunction",
36                                     JavaScriptModuleObject::registerSyncFunction),
37                    makeNativeMethod("registerAsyncFunction",
38                                     JavaScriptModuleObject::registerAsyncFunction),
39                    makeNativeMethod("registerProperty",
40                                     JavaScriptModuleObject::registerProperty),
41                  });
42 }
43 
44 std::shared_ptr<jsi::Object> JavaScriptModuleObject::getJSIObject(jsi::Runtime &runtime) {
45   if (jsiObject == nullptr) {
46     auto hostObject = std::make_shared<JavaScriptModuleObject::HostObject>(this);
47     jsiObject = std::make_shared<jsi::Object>(
48       jsi::Object::createFromHostObject(runtime, hostObject));
49   }
50 
51   return jsiObject;
52 }
53 
54 void JavaScriptModuleObject::exportConstants(
55   jni::alias_ref<react::NativeMap::javaobject> constants
56 ) {
57   auto dynamic = constants->cthis()->consume();
58   assert(dynamic.isObject());
59 
60   for (const auto &[key, value]: dynamic.items()) {
61     this->constants[key.asString()] = value;
62   }
63 }
64 
65 void JavaScriptModuleObject::registerSyncFunction(
66   jni::alias_ref<jstring> name,
67   jint args,
68   jni::alias_ref<jni::JArrayInt> desiredTypes,
69   jni::alias_ref<JNIFunctionBody::javaobject> body
70 ) {
71   std::string cName = name->toStdString();
72   std::unique_ptr<int[]> types = desiredTypes->getRegion(0, args);
73 
74   methodsMetadata.try_emplace(
75     cName,
76     cName,
77     args,
78     false,
79     std::move(types),
80     jni::make_global(body)
81   );
82 }
83 
84 void JavaScriptModuleObject::registerAsyncFunction(
85   jni::alias_ref<jstring> name,
86   jint args,
87   jni::alias_ref<jni::JArrayInt> desiredTypes,
88   jni::alias_ref<JNIAsyncFunctionBody::javaobject> body
89 ) {
90   auto cName = name->toStdString();
91   std::unique_ptr<int[]> types = desiredTypes->getRegion(0, args);
92 
93   methodsMetadata.try_emplace(
94     cName,
95     cName,
96     args,
97     true,
98     std::move(types),
99     jni::make_global(body)
100   );
101 }
102 
103 void JavaScriptModuleObject::registerProperty(
104   jni::alias_ref<jstring> name,
105   jint desiredType,
106   jni::alias_ref<JNIFunctionBody::javaobject> getter,
107   jni::alias_ref<JNIFunctionBody::javaobject> setter
108 ) {
109   auto cName = name->toStdString();
110   std::unique_ptr<int[]> types = std::make_unique<int[]>(1);
111   types[0] = desiredType;
112 
113   auto getterMetadata = MethodMetadata(
114     cName,
115     0,
116     false,
117     std::make_unique<int[]>(0),
118     jni::make_global(getter)
119   );
120 
121   auto setterMetadata = MethodMetadata(
122     cName,
123     1,
124     false,
125     std::move(types),
126     jni::make_global(setter)
127   );
128 
129   auto functions = std::make_pair(
130     std::move(getterMetadata),
131     std::move(setterMetadata)
132   );
133 
134   properties.insert({cName, std::move(functions)});
135 }
136 
137 JavaScriptModuleObject::HostObject::HostObject(
138   JavaScriptModuleObject *jsModule) : jsModule(jsModule) {}
139 
140 jsi::Value JavaScriptModuleObject::HostObject::get(jsi::Runtime &runtime,
141                                                    const jsi::PropNameID &name) {
142   auto cName = name.utf8(runtime);
143 
144   auto constantsRecord = jsModule->constants.find(cName);
145   if (constantsRecord != jsModule->constants.end()) {
146     auto dynamic = constantsRecord->second;
147     return jsi::valueFromDynamic(runtime, dynamic);
148   }
149 
150   auto propertyRecord = jsModule->properties.find(cName);
151   if (propertyRecord != jsModule->properties.end()) {
152     auto&[getter, _] = propertyRecord->second;
153     return getter.callSync(runtime, jsModule->jsiInteropModuleRegistry, nullptr, 0);
154   }
155 
156   auto metadataRecord = jsModule->methodsMetadata.find(cName);
157   if (metadataRecord == jsModule->methodsMetadata.end()) {
158     return jsi::Value::undefined();
159   }
160   auto &metadata = metadataRecord->second;
161   return jsi::Value(runtime, *metadata.toJSFunction(runtime, jsModule->jsiInteropModuleRegistry));
162 }
163 
164 void JavaScriptModuleObject::HostObject::set(
165   jsi::Runtime &runtime,
166   const jsi::PropNameID &name,
167   const jsi::Value &value
168 ) {
169   auto cName = name.utf8(runtime);
170   auto propertyRecord = jsModule->properties.find(cName);
171   if (propertyRecord != jsModule->properties.end()) {
172     auto&[_, setter] = propertyRecord->second;
173     setter.callSync(runtime, jsModule->jsiInteropModuleRegistry, &value, 1);
174     return;
175   }
176 
177   throw jsi::JSError(
178     runtime,
179     "RuntimeError: Cannot override the host object for expo module '" + name.utf8(runtime) + "'"
180   );
181 }
182 
183 std::vector<jsi::PropNameID> JavaScriptModuleObject::HostObject::getPropertyNames(
184   jsi::Runtime &rt
185 ) {
186   auto &metadata = jsModule->methodsMetadata;
187   std::vector<jsi::PropNameID> result;
188   std::transform(
189     metadata.begin(),
190     metadata.end(),
191     std::back_inserter(result),
192     [&rt](const auto &kv) {
193       return jsi::PropNameID::forUtf8(rt, kv.first);
194     }
195   );
196 
197   auto &constants = jsModule->constants;
198   std::transform(
199     constants.begin(),
200     constants.end(),
201     std::back_inserter(result),
202     [&rt](const auto &kv) {
203       return jsi::PropNameID::forUtf8(rt, kv.first);
204     }
205   );
206 
207   auto &properties = jsModule->properties;
208   std::transform(
209     properties.begin(),
210     properties.end(),
211     std::back_inserter(result),
212     [&rt](const auto &kv) {
213       return jsi::PropNameID::forUtf8(rt, kv.first);
214     }
215   );
216 
217   return result;
218 }
219 } // namespace expo
220