Home | History | Annotate | Download | only in v8 
      1 /*
      2  * Copyright 2010, The Android Open Source Project
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  *  * Redistributions of source code must retain the above copyright
      8  *    notice, this list of conditions and the following disclaimer.
      9  *  * Redistributions in binary form must reproduce the above copyright
     10  *    notice, this list of conditions and the following disclaimer in the
     11  *    documentation and/or other materials provided with the distribution.
     12  *
     13  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY
     14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
     17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
     21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     24  */
     25 
     26 #include "config.h"
     27 #include "JavaClassJobjectV8.h"
     28 
     29 #if ENABLE(JAVA_BRIDGE)
     30 
     31 #include "JavaFieldJobjectV8.h"
     32 #include "JavaMethodJobject.h"
     33 
     34 using namespace JSC::Bindings;
     35 
     36 #if PLATFORM(ANDROID)
     37 const char kJavaScriptInterfaceAnnotation[] = "android/webkit/JavascriptInterface";
     38 const char kIsAnnotationPresent[] = "isAnnotationPresent";
     39 const char kGetMethods[] = "getMethods";
     40 
     41 static jclass safeAnnotationClazz = NULL;
     42 
     43 JavaClassJobject::JavaClassJobject(jobject anInstance, bool requireAnnotation)
     44     : m_requireAnnotation(requireAnnotation)
     45 #else
     46 JavaClassJobject::JavaClassJobject(jobject anInstance)
     47 #endif
     48 {
     49     jobject aClass = callJNIMethod<jobject>(anInstance, "getClass", "()Ljava/lang/Class;");
     50 
     51     if (!aClass) {
     52         LOG_ERROR("unable to call getClass on instance %p", anInstance);
     53         return;
     54     }
     55 
     56     JNIEnv* env = getJNIEnv();
     57 
     58     // Get the fields
     59     jarray fields = static_cast<jarray>(callJNIMethod<jobject>(aClass, "getFields", "()[Ljava/lang/reflect/Field;"));
     60     int numFields = env->GetArrayLength(fields);
     61     for (int i = 0; i < numFields; i++) {
     62         jobject aJField = env->GetObjectArrayElement(static_cast<jobjectArray>(fields), i);
     63         JavaField* aField = new JavaFieldJobject(env, aJField); // deleted in the JavaClass destructor
     64         m_fields.set(aField->name(), aField);
     65         env->DeleteLocalRef(aJField);
     66     }
     67 
     68     // Get the methods
     69     jarray methods = static_cast<jarray>(callJNIMethod<jobject>(aClass, "getMethods", "()[Ljava/lang/reflect/Method;"));
     70     int numMethods = env->GetArrayLength(methods);
     71 #if PLATFORM(ANDROID)
     72     jmethodID isAnnotationPresentMethodID = getAnnotationMethodID(env);
     73     if (!isAnnotationPresentMethodID) {
     74         LOG_ERROR("unable to find method %s on instance %p", kIsAnnotationPresent, anInstance);
     75         return;
     76     }
     77 #endif
     78     for (int i = 0; i < numMethods; i++) {
     79         jobject aJMethod = env->GetObjectArrayElement(static_cast<jobjectArray>(methods), i);
     80 #if PLATFORM(ANDROID)
     81         if (jsAccessAllowed(env, isAnnotationPresentMethodID, aJMethod)) {
     82 #endif
     83             JavaMethod* aMethod = new JavaMethodJobject(env, aJMethod); // deleted in the JavaClass destructor
     84             MethodList* methodList = m_methods.get(aMethod->name());
     85             if (!methodList) {
     86                 methodList = new MethodList();
     87                 m_methods.set(aMethod->name(), methodList);
     88             }
     89             methodList->append(aMethod);
     90 #if PLATFORM(ANDROID)
     91         }
     92 #endif
     93         env->DeleteLocalRef(aJMethod);
     94     }
     95     env->DeleteLocalRef(fields);
     96     env->DeleteLocalRef(methods);
     97     env->DeleteLocalRef(aClass);
     98 }
     99 
    100 JavaClassJobject::~JavaClassJobject()
    101 {
    102     deleteAllValues(m_fields);
    103     m_fields.clear();
    104 
    105     MethodListMap::const_iterator end = m_methods.end();
    106     for (MethodListMap::const_iterator it = m_methods.begin(); it != end; ++it) {
    107         const MethodList* methodList = it->second;
    108         deleteAllValues(*methodList);
    109         delete methodList;
    110     }
    111     m_methods.clear();
    112 }
    113 
    114 #if PLATFORM(ANDROID)
    115 bool JavaClassJobject::jsAccessAllowed(JNIEnv* env, jmethodID mid, jobject aJMethod)
    116 {
    117     if (!m_requireAnnotation)
    118         return true;
    119     bool accessAllowed = env->CallBooleanMethod(aJMethod, mid, safeAnnotationClazz);
    120     if (env->ExceptionCheck()) {
    121         env->ExceptionDescribe();
    122         env->ExceptionClear();
    123         return false;
    124     }
    125     return accessAllowed;
    126 }
    127 
    128 jmethodID JavaClassJobject::getAnnotationMethodID(JNIEnv* env)
    129 {
    130     jclass methodClass = env->FindClass("java/lang/reflect/Method");
    131     jmethodID mid = 0;
    132     if (methodClass)
    133         mid = env->GetMethodID(methodClass, kIsAnnotationPresent, "(Ljava/lang/Class;)Z");
    134     if (!methodClass || !mid) {
    135         env->ExceptionDescribe();
    136         env->ExceptionClear();
    137     }
    138     env->DeleteLocalRef(methodClass);
    139     return mid;
    140 }
    141 
    142 bool JavaClassJobject::RegisterJavaClassJobject(JNIEnv* env) {
    143     safeAnnotationClazz = reinterpret_cast<jclass>(env->NewGlobalRef(env->FindClass(kJavaScriptInterfaceAnnotation)));
    144     if (!safeAnnotationClazz) {
    145         LOG_ERROR("failed to register %s", kJavaScriptInterfaceAnnotation);
    146         return false;
    147     }
    148     return true;
    149 }
    150 #endif
    151 
    152 MethodList JavaClassJobject::methodsNamed(const char* name) const
    153 {
    154     MethodList* methodList = m_methods.get(name);
    155 
    156     if (methodList)
    157         return *methodList;
    158     return MethodList();
    159 }
    160 
    161 JavaField* JavaClassJobject::fieldNamed(const char* name) const
    162 {
    163     return m_fields.get(name);
    164 }
    165 
    166 #endif // ENABLE(JAVA_BRIDGE)
    167