inspector/InjectedScriptBase.cpp

   1 /*
   2  * Copyright (C) 2013 Apple Inc. All rights reserved.
   3  * Copyright (C) 2012 Google Inc. All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions are
   7  * met:
   8  *
   9  *     * Redistributions of source code must retain the above copyright
  10  * notice, this list of conditions and the following disclaimer.
  11  *     * Redistributions in binary form must reproduce the above
  12  * copyright notice, this list of conditions and the following disclaimer
  13  * in the documentation and/or other materials provided with the
  14  * distribution.
  15  *     * Neither the name of Google Inc. nor the names of its
  16  * contributors may be used to endorse or promote products derived from
  17  * this software without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  20  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  21  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  22  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  23  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  24  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  25  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  26  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  27  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  28  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  29  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  30  */
  31
  32 #include "config.h"
  33 #include "InjectedScriptBase.h"
  34
  35 #if ENABLE(INSPECTOR)
  36
  37 #include "InspectorValues.h"
  38 #include "JSCInlines.h"
  39 #include "JSGlobalObject.h"
  40 #include "ScriptFunctionCall.h"
  41 #include <wtf/text/WTFString.h>
  42
  43 namespace Inspector {
  44
  45 InjectedScriptBase::InjectedScriptBase(const String& name)
  46     : m_name(name)
  47     , m_environment(nullptr)
  48 {
  49 }
  50
  51 InjectedScriptBase::InjectedScriptBase(const String& name, Deprecated::ScriptObject injectedScriptObject, InspectorEnvironment* environment)
  52     : m_name(name)
  53     , m_injectedScriptObject(injectedScriptObject)
  54     , m_environment(environment)
  55 {
  56 }
  57
  58 InjectedScriptBase::~InjectedScriptBase()
  59 {
  60 }
  61
  62 void InjectedScriptBase::initialize(Deprecated::ScriptObject injectedScriptObject, InspectorEnvironment* environment)
  63 {
  64     m_injectedScriptObject = injectedScriptObject;
  65     m_environment = environment;
  66 }
  67
  68 bool InjectedScriptBase::hasAccessToInspectedScriptState() const
  69 {
  70     return m_environment && m_environment->canAccessInspectedScriptState(m_injectedScriptObject.scriptState());
  71 }
  72
  73 const Deprecated::ScriptObject& InjectedScriptBase::injectedScriptObject() const
  74 {
  75     return m_injectedScriptObject;
  76 }
  77
  78 Deprecated::ScriptValue InjectedScriptBase::callFunctionWithEvalEnabled(Deprecated::ScriptFunctionCall& function, bool& hadException) const
  79 {
  80     if (m_environment)
  81         m_environment->willCallInjectedScriptFunction(m_injectedScriptObject.scriptState(), name(), 1);
  82
  83     JSC::ExecState* scriptState = m_injectedScriptObject.scriptState();
  84     bool evalIsDisabled = false;
  85     if (scriptState) {
  86         evalIsDisabled = !scriptState->lexicalGlobalObject()->evalEnabled();
  87         // Temporarily enable allow evals for inspector.
  88         if (evalIsDisabled)
  89             scriptState->lexicalGlobalObject()->setEvalEnabled(true);
  90     }
  91
  92     Deprecated::ScriptValue resultValue = function.call(hadException);
  93
  94     if (evalIsDisabled)
  95         scriptState->lexicalGlobalObject()->setEvalEnabled(false);
  96
  97     if (m_environment)
  98         m_environment->didCallInjectedScriptFunction(m_injectedScriptObject.scriptState());
  99
 100     return resultValue;
 101 }
 102
 103 void InjectedScriptBase::makeCall(Deprecated::ScriptFunctionCall& function, RefPtr<InspectorValue>* result)
 104 {
 105     if (hasNoValue() || !hasAccessToInspectedScriptState()) {
 106         *result = InspectorValue::null();
 107         return;
 108     }
 109
 110     bool hadException = false;
 111     Deprecated::ScriptValue resultValue = callFunctionWithEvalEnabled(function, hadException);
 112
 113     ASSERT(!hadException);
 114     if (!hadException) {
 115         *result = resultValue.toInspectorValue(m_injectedScriptObject.scriptState());
 116         if (!*result)
 117             *result = InspectorString::create(String::format("Object has too long reference chain (must not be longer than %d)", InspectorValue::maxDepth));
 118     } else
 119         *result = InspectorString::create("Exception while making a call.");
 120 }
 121
 122 void InjectedScriptBase::makeEvalCall(ErrorString* errorString, Deprecated::ScriptFunctionCall& function, RefPtr<TypeBuilder::Runtime::RemoteObject>* objectResult, TypeBuilder::OptOutput<bool>* wasThrown)
 123 {
 124     RefPtr<InspectorValue> result;
 125     makeCall(function, &result);
 126     if (!result) {
 127         *errorString = ASCIILiteral("Internal error: result value is empty");
 128         return;
 129     }
 130
 131     if (result->type() == InspectorValue::TypeString) {
 132         result->asString(errorString);
 133         ASSERT(errorString->length());
 134         return;
 135     }
 136
 137     RefPtr<InspectorObject> resultPair = result->asObject();
 138     if (!resultPair) {
 139         *errorString = ASCIILiteral("Internal error: result is not an Object");
 140         return;
 141     }
 142
 143     RefPtr<InspectorObject> resultObj = resultPair->getObject(ASCIILiteral("result"));
 144     bool wasThrownVal = false;
 145     if (!resultObj || !resultPair->getBoolean(ASCIILiteral("wasThrown"), &wasThrownVal)) {
 146         *errorString = ASCIILiteral("Internal error: result is not a pair of value and wasThrown flag");
 147         return;
 148     }
 149
 150     *objectResult = TypeBuilder::Runtime::RemoteObject::runtimeCast(resultObj);
 151     *wasThrown = wasThrownVal;
 152 }
 153
 154 } // namespace Inspector
 155
 156 #endif // ENABLE(INSPECTOR)