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      1 // Copyright (c) 2008, Google Inc.
      2 // 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 #include "config.h"
     31 #include "bindings/v8/custom/V8CustomXPathNSResolver.h"
     32 
     33 #include "bindings/v8/ScriptController.h"
     34 #include "bindings/v8/V8Binding.h"
     35 #include "bindings/v8/V8Utilities.h"
     36 #include "core/dom/ScriptExecutionContext.h"
     37 #include "core/inspector/ScriptCallStack.h"
     38 #include "core/page/DOMWindow.h"
     39 #include "core/page/Frame.h"
     40 #include "core/page/Page.h"
     41 #include "core/page/PageConsole.h"
     42 #include "wtf/text/WTFString.h"
     43 
     44 namespace WebCore {
     45 
     46 PassRefPtr<V8CustomXPathNSResolver> V8CustomXPathNSResolver::create(v8::Handle<v8::Object> resolver, v8::Isolate* isolate)
     47 {
     48     return adoptRef(new V8CustomXPathNSResolver(resolver, isolate));
     49 }
     50 
     51 V8CustomXPathNSResolver::V8CustomXPathNSResolver(v8::Handle<v8::Object> resolver, v8::Isolate* isolate)
     52     : m_resolver(resolver)
     53     , m_isolate(isolate)
     54 {
     55 }
     56 
     57 V8CustomXPathNSResolver::~V8CustomXPathNSResolver()
     58 {
     59 }
     60 
     61 String V8CustomXPathNSResolver::lookupNamespaceURI(const String& prefix)
     62 {
     63     v8::Handle<v8::Function> lookupNamespaceURIFunc;
     64     v8::Handle<v8::String> lookupNamespaceURIName = v8::String::NewSymbol("lookupNamespaceURI");
     65 
     66     // Check if the resolver has a function property named lookupNamespaceURI.
     67     if (m_resolver->Has(lookupNamespaceURIName)) {
     68         v8::Handle<v8::Value> lookupNamespaceURI = m_resolver->Get(lookupNamespaceURIName);
     69         if (lookupNamespaceURI->IsFunction())
     70             lookupNamespaceURIFunc = v8::Handle<v8::Function>::Cast(lookupNamespaceURI);
     71     }
     72 
     73     if (lookupNamespaceURIFunc.IsEmpty() && !m_resolver->IsFunction()) {
     74         Frame* frame = activeDOMWindow()->frame();
     75         if (frame && frame->page())
     76             frame->page()->console()->addMessage(JSMessageSource, ErrorMessageLevel, "XPathNSResolver does not have a lookupNamespaceURI method.");
     77         return String();
     78     }
     79 
     80     // Catch exceptions from calling the namespace resolver.
     81     v8::TryCatch tryCatch;
     82     tryCatch.SetVerbose(true); // Print exceptions to console.
     83 
     84     const int argc = 1;
     85     v8::Handle<v8::Value> argv[argc] = { v8String(prefix, m_isolate) };
     86     v8::Handle<v8::Function> function = lookupNamespaceURIFunc.IsEmpty() ? v8::Handle<v8::Function>::Cast(m_resolver) : lookupNamespaceURIFunc;
     87 
     88     v8::Handle<v8::Value> retval = ScriptController::callFunctionWithInstrumentation(0, function, m_resolver, argc, argv);
     89 
     90     // Eat exceptions from namespace resolver and return an empty string. This will most likely cause NamespaceError.
     91     if (tryCatch.HasCaught())
     92         return String();
     93 
     94     return toWebCoreStringWithNullCheck(retval);
     95 }
     96 
     97 } // namespace WebCore
     98