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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 "V8CustomXPathNSResolver.h"
     32 
     33 #if ENABLE(XPATH)
     34 
     35 #include "PlatformString.h"
     36 #include "V8Binding.h"
     37 #include "V8Proxy.h"
     38 
     39 namespace WebCore {
     40 
     41 PassRefPtr<V8CustomXPathNSResolver> V8CustomXPathNSResolver::create(V8Proxy* proxy, v8::Handle<v8::Object> resolver)
     42 {
     43     return adoptRef(new V8CustomXPathNSResolver(proxy, resolver));
     44 }
     45 
     46 V8CustomXPathNSResolver::V8CustomXPathNSResolver(V8Proxy* proxy, v8::Handle<v8::Object> resolver)
     47         : m_proxy(proxy)
     48         , m_resolver(resolver)
     49 {
     50 }
     51 
     52 V8CustomXPathNSResolver::~V8CustomXPathNSResolver()
     53 {
     54 }
     55 
     56 String V8CustomXPathNSResolver::lookupNamespaceURI(const String& prefix)
     57 {
     58     V8Proxy* proxy = m_proxy;
     59 
     60     if (!proxy) {
     61         proxy = V8Proxy::retrieve();
     62         if (!proxy)
     63             return String();
     64     }
     65 
     66     v8::Handle<v8::Function> lookupNamespaceURIFunc;
     67     v8::Handle<v8::String> lookupNamespaceURIName = v8::String::New("lookupNamespaceURI");
     68 
     69     // Check if the resolver has a function property named lookupNamespaceURI.
     70     if (m_resolver->Has(lookupNamespaceURIName)) {
     71         v8::Handle<v8::Value> lookupNamespaceURI = m_resolver->Get(lookupNamespaceURIName);
     72         if (lookupNamespaceURI->IsFunction())
     73             lookupNamespaceURIFunc = v8::Handle<v8::Function>::Cast(lookupNamespaceURI);
     74     }
     75 
     76     if (lookupNamespaceURIFunc.IsEmpty() && !m_resolver->IsFunction()) {
     77         Frame* frame = proxy->frame();
     78         logInfo(frame, "XPathNSResolver does not have a lookupNamespaceURI method.", String());
     79         return String();
     80     }
     81 
     82     // Catch exceptions from calling the namespace resolver.
     83     v8::TryCatch try_catch;
     84     try_catch.SetVerbose(true);  // Print exceptions to console.
     85 
     86     const int argc = 1;
     87     v8::Handle<v8::Value> argv[argc] = { v8String(prefix) };
     88     v8::Handle<v8::Function> function = lookupNamespaceURIFunc.IsEmpty() ? v8::Handle<v8::Function>::Cast(m_resolver) : lookupNamespaceURIFunc;
     89 
     90     v8::Handle<v8::Value> retval = proxy->callFunction(function, m_resolver, argc, argv);
     91 
     92     // Eat exceptions from namespace resolver and return an empty string. This will most likely cause NAMESPACE_ERR.
     93     if (try_catch.HasCaught())
     94         return String();
     95 
     96     return toWebCoreStringWithNullCheck(retval);
     97 }
     98 
     99 } // namespace WebCore
    100 
    101 #endif // ENABLE(XPATH)
    102