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      1 /*
      2  * Copyright (C) 2013 Google Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions are
      6  * met:
      7  *
      8  *     * Redistributions of source code must retain the above copyright
      9  * notice, this list of conditions and the following disclaimer.
     10  *     * Redistributions in binary form must reproduce the above
     11  * copyright notice, this list of conditions and the following disclaimer
     12  * in the documentation and/or other materials provided with the
     13  * distribution.
     14  *     * Neither the name of Google Inc. nor the names of its
     15  * contributors may be used to endorse or promote products derived from
     16  * this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #ifndef ExceptionState_h
     32 #define ExceptionState_h
     33 
     34 #include "bindings/core/v8/ScopedPersistent.h"
     35 #include "bindings/core/v8/ScriptPromise.h"
     36 #include "bindings/core/v8/V8ThrowException.h"
     37 #include "wtf/Noncopyable.h"
     38 #include "wtf/text/WTFString.h"
     39 #include <v8.h>
     40 
     41 namespace blink {
     42 
     43 typedef int ExceptionCode;
     44 class ScriptState;
     45 
     46 class ExceptionState {
     47     WTF_MAKE_NONCOPYABLE(ExceptionState);
     48 public:
     49     enum Context {
     50         ConstructionContext,
     51         ExecutionContext,
     52         DeletionContext,
     53         GetterContext,
     54         SetterContext,
     55         EnumerationContext,
     56         QueryContext,
     57         IndexedGetterContext,
     58         IndexedSetterContext,
     59         IndexedDeletionContext,
     60         UnknownContext, // FIXME: Remove this once we've flipped over to the new API.
     61     };
     62 
     63     ExceptionState(Context context, const char* propertyName, const char* interfaceName, const v8::Handle<v8::Object>& creationContext, v8::Isolate* isolate)
     64         : m_code(0)
     65         , m_context(context)
     66         , m_propertyName(propertyName)
     67         , m_interfaceName(interfaceName)
     68         , m_creationContext(creationContext)
     69         , m_isolate(isolate) { }
     70 
     71     ExceptionState(Context context, const char* interfaceName, const v8::Handle<v8::Object>& creationContext, v8::Isolate* isolate)
     72         : m_code(0)
     73         , m_context(context)
     74         , m_propertyName(0)
     75         , m_interfaceName(interfaceName)
     76         , m_creationContext(creationContext)
     77         , m_isolate(isolate) { ASSERT(m_context == ConstructionContext || m_context == EnumerationContext || m_context == IndexedSetterContext || m_context == IndexedGetterContext || m_context == IndexedDeletionContext); }
     78 
     79     virtual void throwDOMException(const ExceptionCode&, const String& message);
     80     virtual void throwTypeError(const String& message);
     81     virtual void throwSecurityError(const String& sanitizedMessage, const String& unsanitizedMessage = String());
     82     virtual void throwRangeError(const String& message);
     83 
     84     bool hadException() const { return !m_exception.isEmpty() || m_code; }
     85     void clearException();
     86 
     87     ExceptionCode code() const { return m_code; }
     88     const String& message() const { return m_message; }
     89 
     90     bool throwIfNeeded()
     91     {
     92         if (!hadException())
     93             return false;
     94         throwException();
     95         return true;
     96     }
     97 
     98     // This method clears out the exception which |this| has.
     99     ScriptPromise reject(ScriptState*);
    100 
    101     Context context() const { return m_context; }
    102     const char* propertyName() const { return m_propertyName; }
    103     const char* interfaceName() const { return m_interfaceName; }
    104 
    105     void rethrowV8Exception(v8::Handle<v8::Value> value)
    106     {
    107         setException(value);
    108     }
    109 
    110 protected:
    111     ExceptionCode m_code;
    112     Context m_context;
    113     String m_message;
    114     const char* m_propertyName;
    115     const char* m_interfaceName;
    116 
    117 private:
    118     void setException(v8::Handle<v8::Value>);
    119     void throwException();
    120 
    121     String addExceptionContext(const String&) const;
    122 
    123     ScopedPersistent<v8::Value> m_exception;
    124     v8::Handle<v8::Object> m_creationContext;
    125     v8::Isolate* m_isolate;
    126 };
    127 
    128 // Used if exceptions can/should not be directly thrown.
    129 class NonThrowableExceptionState FINAL : public ExceptionState {
    130 public:
    131     NonThrowableExceptionState(): ExceptionState(ExceptionState::UnknownContext, 0, 0, v8::Handle<v8::Object>(), v8::Isolate::GetCurrent()) { }
    132     virtual void throwDOMException(const ExceptionCode&, const String& message) OVERRIDE;
    133     virtual void throwTypeError(const String& message = String()) OVERRIDE;
    134     virtual void throwSecurityError(const String& sanitizedMessage, const String& unsanitizedMessage = String()) OVERRIDE;
    135     virtual void throwRangeError(const String& message) OVERRIDE;
    136 };
    137 
    138 // Used if any exceptions thrown are ignorable.
    139 class TrackExceptionState FINAL : public ExceptionState {
    140 public:
    141     TrackExceptionState(): ExceptionState(ExceptionState::UnknownContext, 0, 0, v8::Handle<v8::Object>(), v8::Isolate::GetCurrent()) { }
    142     virtual void throwDOMException(const ExceptionCode&, const String& message) OVERRIDE;
    143     virtual void throwTypeError(const String& message = String()) OVERRIDE;
    144     virtual void throwSecurityError(const String& sanitizedMessage, const String& unsanitizedMessage = String()) OVERRIDE;
    145     virtual void throwRangeError(const String& message) OVERRIDE;
    146 };
    147 
    148 } // namespace blink
    149 
    150 #endif // ExceptionState_h
    151