Source/core/html/HTMLImportLoader.cpp

/*
 * Copyright (C) 2013 Google Inc. All rights reserved.
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 * modification, are permitted provided that the following conditions are
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 *
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 * notice, this list of conditions and the following disclaimer.
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 * in the documentation and/or other materials provided with the
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 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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#include "config.h"
#include "core/html/HTMLImportLoader.h"

#include "core/dom/Document.h"
#include "core/dom/custom/CustomElementRegistrationContext.h"
#include "core/fetch/ResourceFetcher.h"
#include "core/frame/ContentSecurityPolicyResponseHeaders.h"
#include "core/html/HTMLDocument.h"
#include "core/html/HTMLImport.h"
#include "core/html/HTMLImportLoaderClient.h"
#include "core/loader/DocumentWriter.h"


namespace WebCore {

PassRefPtr<HTMLImportLoader> HTMLImportLoader::create(HTMLImport* import, ResourceFetcher* fetcher)
{
    RefPtr<HTMLImportLoader> self = adoptRef(new HTMLImportLoader(import, fetcher));
    return self.release();
}

HTMLImportLoader::HTMLImportLoader(HTMLImport* import, ResourceFetcher* fetcher)
    : m_import(import)
    , m_fetcher(fetcher)
    , m_state(StateLoading)
{
}

HTMLImportLoader::~HTMLImportLoader()
{
    if (m_importedDocument)
        m_importedDocument->setImport(0);
}

void HTMLImportLoader::startLoading(const ResourcePtr<RawResource>& resource)
{
    setResource(resource);
}

void HTMLImportLoader::responseReceived(Resource* resource, const ResourceResponse& response)
{
    // Current canAccess() implementation isn't sufficient for catching cross-domain redirects: http://crbug.com/256976
    if (!m_fetcher->canAccess(resource, PotentiallyCORSEnabled)) {
        setState(StateError);
        return;
    }

    setState(startWritingAndParsing(response));
}

void HTMLImportLoader::dataReceived(Resource*, const char* data, int length)
{
    RefPtr<DocumentWriter> protectingWriter(m_writer);
    m_writer->addData(data, length);
}

void HTMLImportLoader::notifyFinished(Resource* resource)
{
    // The writer instance indicates that a part of the document can be already loaded.
    // We don't take such a case as an error because the partially-loaded document has been visible from script at this point.
    if (resource->loadFailedOrCanceled() && !m_writer) {
        setState(StateError);
        return;
    }

    setState(finishWriting());
}

HTMLImportLoader::State HTMLImportLoader::startWritingAndParsing(const ResourceResponse& response)
{
    DocumentInit init = DocumentInit(response.url(), 0, m_import->master()->contextDocument(), m_import)
        .withRegistrationContext(m_import->master()->registrationContext());
    m_importedDocument = HTMLDocument::create(init);
    m_importedDocument->initContentSecurityPolicy(ContentSecurityPolicyResponseHeaders(response));
    m_writer = DocumentWriter::create(m_importedDocument.get(), response.mimeType(), response.textEncodingName());

    return StateLoading;
}

HTMLImportLoader::State HTMLImportLoader::finishWriting()
{
    return StateWritten;
}

HTMLImportLoader::State HTMLImportLoader::finishParsing()
{
    return StateReady;
}

void HTMLImportLoader::setState(State state)
{
    if (m_state == state)
        return;

    m_state = state;

    if (m_state == StateReady || m_state == StateError || m_state == StateWritten) {
        if (RefPtr<DocumentWriter> writer = m_writer.release())
            writer->end();
    }

    // Since DocumentWriter::end() can let setState() reenter, we shouldn't refer to m_state here.
    if (state == StateReady || state == StateError)
        didFinish();
}

void HTMLImportLoader::didFinishParsing()
{
    setState(finishParsing());
}

Document* HTMLImportLoader::importedDocument() const
{
    if (m_state == StateError)
        return 0;
    return m_importedDocument.get();
}

bool HTMLImportLoader::isProcessing() const
{
    if (!m_importedDocument)
        return !isDone();
    return m_importedDocument->parsing();
}

void HTMLImportLoader::didFinish()
{
    for (size_t i = 0; i < m_clients.size(); ++i)
        m_clients[i]->didFinish();

    clearResource();

    ASSERT(!m_importedDocument || !m_importedDocument->parsing());
}

void HTMLImportLoader::addClient(HTMLImportLoaderClient* client)
{
    ASSERT(kNotFound == m_clients.find(client));
    m_clients.append(client);
    if (isDone())
        client->didFinish();
}

void HTMLImportLoader::removeClient(HTMLImportLoaderClient* client)
{
    ASSERT(kNotFound != m_clients.find(client));
    m_clients.remove(m_clients.find(client));
}


} // namespace WebCore