Source/core/fileapi/ThreadableBlobRegistry.cpp

/*
 * Copyright (C) 2010 Google Inc. All rights reserved.
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
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 * notice, this list of conditions and the following disclaimer.
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 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
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 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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#include "config.h"
#include "core/fileapi/ThreadableBlobRegistry.h"

#include "core/fileapi/BlobURL.h"
#include "core/platform/network/BlobData.h"
#include "core/platform/network/BlobRegistry.h"
#include "origin/SecurityOrigin.h"
#include "origin/SecurityOriginCache.h"
#include "wtf/HashMap.h"
#include "wtf/MainThread.h"
#include "wtf/RefPtr.h"
#include "wtf/ThreadSpecific.h"
#include "wtf/text/StringHash.h"

using WTF::ThreadSpecific;

namespace WebCore {

class BlobOriginCache : public SecurityOriginCache {
public:
    BlobOriginCache();
    virtual SecurityOrigin* cachedOrigin(const KURL&) OVERRIDE;
};

struct BlobRegistryContext {
    WTF_MAKE_FAST_ALLOCATED;
public:
    BlobRegistryContext(const KURL& url, PassOwnPtr<BlobData> blobData)
        : url(url.copy())
        , blobData(blobData)
    {
        this->blobData->detachFromCurrentThread();
    }

    BlobRegistryContext(const KURL& url, const KURL& srcURL)
        : url(url.copy())
        , srcURL(srcURL.copy())
    {
    }

    BlobRegistryContext(const KURL& url)
        : url(url.copy())
    {
    }

    KURL url;
    KURL srcURL;
    OwnPtr<BlobData> blobData;
};

typedef HashMap<String, RefPtr<SecurityOrigin> > BlobURLOriginMap;
static ThreadSpecific<BlobURLOriginMap>& originMap()
{
    // We want to create the BlobOriginCache exactly once because it is shared by all the threads.
    AtomicallyInitializedStatic(BlobOriginCache*, cache = new BlobOriginCache);

    AtomicallyInitializedStatic(ThreadSpecific<BlobURLOriginMap>*, map = new ThreadSpecific<BlobURLOriginMap>);
    return *map;
}

static void registerBlobURLTask(void* context)
{
    OwnPtr<BlobRegistryContext> blobRegistryContext = adoptPtr(static_cast<BlobRegistryContext*>(context));
    blobRegistry().registerBlobURL(blobRegistryContext->url, blobRegistryContext->blobData.release());
}

void ThreadableBlobRegistry::registerBlobURL(const KURL& url, PassOwnPtr<BlobData> blobData)
{
    if (isMainThread())
        blobRegistry().registerBlobURL(url, blobData);
    else {
        OwnPtr<BlobRegistryContext> context = adoptPtr(new BlobRegistryContext(url, blobData));
        callOnMainThread(&registerBlobURLTask, context.leakPtr());
    }
}

static void registerBlobURLFromTask(void* context)
{
    OwnPtr<BlobRegistryContext> blobRegistryContext = adoptPtr(static_cast<BlobRegistryContext*>(context));
    blobRegistry().registerBlobURL(blobRegistryContext->url, blobRegistryContext->srcURL);
}

void ThreadableBlobRegistry::registerBlobURL(SecurityOrigin* origin, const KURL& url, const KURL& srcURL)
{
    // If the blob URL contains null origin, as in the context with unique
    // security origin or file URL, save the mapping between url and origin so
    // that the origin can be retrived when doing security origin check.
    if (origin && BlobURL::getOrigin(url) == "null")
        originMap()->add(url.string(), origin);

    if (isMainThread())
        blobRegistry().registerBlobURL(url, srcURL);
    else {
        OwnPtr<BlobRegistryContext> context = adoptPtr(new BlobRegistryContext(url, srcURL));
        callOnMainThread(&registerBlobURLFromTask, context.leakPtr());
    }
}

static void unregisterBlobURLTask(void* context)
{
    OwnPtr<BlobRegistryContext> blobRegistryContext = adoptPtr(static_cast<BlobRegistryContext*>(context));
    blobRegistry().unregisterBlobURL(blobRegistryContext->url);
}

void ThreadableBlobRegistry::unregisterBlobURL(const KURL& url)
{
    if (BlobURL::getOrigin(url) == "null")
        originMap()->remove(url.string());

    if (isMainThread())
        blobRegistry().unregisterBlobURL(url);
    else {
        OwnPtr<BlobRegistryContext> context = adoptPtr(new BlobRegistryContext(url));
        callOnMainThread(&unregisterBlobURLTask, context.leakPtr());
    }
}

BlobOriginCache::BlobOriginCache()
{
    SecurityOrigin::setCache(this);
}

SecurityOrigin* BlobOriginCache::cachedOrigin(const KURL& url)
{
    if (url.protocolIs("blob"))
        return originMap()->get(url.string());
    return 0;
}

} // namespace WebCore