Source/WebCore/fileapi/ThreadableBlobRegistry.cpp

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#include "config.h"
#include "ThreadableBlobRegistry.h"

#include "BlobDataFileReference.h"
#include "BlobPart.h"
#include "BlobRegistry.h"
#include "BlobURL.h"
#include "CrossOriginOpenerPolicy.h"
#include "PolicyContainer.h"
#include "SecurityOrigin.h"
#include <mutex>
#include <wtf/CrossThreadQueue.h>
#include <wtf/CrossThreadTask.h>
#include <wtf/HashMap.h>
#include <wtf/MainThread.h>
#include <wtf/RefPtr.h>
#include <wtf/ThreadSpecific.h>
#include <wtf/text/StringHash.h>
#include <wtf/threads/BinarySemaphore.h>

namespace WebCore {

typedef HashMap<String, RefPtr<SecurityOrigin>> BlobUrlOriginMap;

static ThreadSpecific<BlobUrlOriginMap>& originMap()
{
    static std::once_flag onceFlag;
    static ThreadSpecific<BlobUrlOriginMap>* map;
    std::call_once(onceFlag, []{
        map = new ThreadSpecific<BlobUrlOriginMap>;
    });

    return *map;
}

void ThreadableBlobRegistry::registerFileBlobURL(const URL& url, const String& path, const String& replacementPath, const String& contentType)
{
    String effectivePath = !replacementPath.isNull() ? replacementPath : path;

    if (isMainThread()) {
        blobRegistry().registerFileBlobURL(url, BlobDataFileReference::create(effectivePath), path, contentType);
        return;
    }

    callOnMainThread([url = url.isolatedCopy(), effectivePath = effectivePath.isolatedCopy(), path = path.isolatedCopy(), contentType = contentType.isolatedCopy()] {
        blobRegistry().registerFileBlobURL(url, BlobDataFileReference::create(effectivePath), path, contentType);
    });
}

void ThreadableBlobRegistry::registerBlobURL(const URL& url, Vector<BlobPart>&& blobParts, const String& contentType)
{
    if (isMainThread()) {
        blobRegistry().registerBlobURL(url, WTFMove(blobParts), contentType);
        return;
    }
    for (auto& part : blobParts)
        part.detachFromCurrentThread();
    callOnMainThread([url = url.isolatedCopy(), blobParts = WTFMove(blobParts), contentType = contentType.isolatedCopy()]() mutable {
        blobRegistry().registerBlobURL(url, WTFMove(blobParts), contentType);
    });
}

static inline bool isBlobURLContainsNullOrigin(const URL& url)
{
    ASSERT(url.protocolIsBlob());
    unsigned startIndex = url.pathStart();
    unsigned endIndex = url.pathAfterLastSlash();
    return StringView(url.string()).substring(startIndex, endIndex - startIndex - 1) == "null"_s;
}

void ThreadableBlobRegistry::registerBlobURL(SecurityOrigin* origin, PolicyContainer&& policyContainer, const URL& url, const URL& 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 && isBlobURLContainsNullOrigin(url))
        originMap()->add(url.string(), origin);

    if (isMainThread()) {
        blobRegistry().registerBlobURL(url, srcURL, policyContainer);
        return;
    }

    callOnMainThread([url = url.isolatedCopy(), srcURL = srcURL.isolatedCopy(), policyContainer = crossThreadCopy(WTFMove(policyContainer))] {
        blobRegistry().registerBlobURL(url, srcURL, policyContainer);
    });
}

void ThreadableBlobRegistry::registerBlobURLOptionallyFileBacked(const URL& url, const URL& srcURL, const String& fileBackedPath, const String& contentType)
{
    if (isMainThread()) {
        blobRegistry().registerBlobURLOptionallyFileBacked(url, srcURL, BlobDataFileReference::create(fileBackedPath), contentType);
        return;
    }
    callOnMainThread([url = url.isolatedCopy(), srcURL = srcURL.isolatedCopy(), fileBackedPath = fileBackedPath.isolatedCopy(), contentType = contentType.isolatedCopy()] {
        blobRegistry().registerBlobURLOptionallyFileBacked(url, srcURL, BlobDataFileReference::create(fileBackedPath), contentType);
    });
}

void ThreadableBlobRegistry::registerBlobURLForSlice(const URL& newURL, const URL& srcURL, long long start, long long end, const String& contentType)
{
    if (isMainThread()) {
        blobRegistry().registerBlobURLForSlice(newURL, srcURL, start, end, contentType);
        return;
    }

    callOnMainThread([newURL = newURL.isolatedCopy(), srcURL = srcURL.isolatedCopy(), start, end, contentType = contentType.isolatedCopy()] {
        blobRegistry().registerBlobURLForSlice(newURL, srcURL, start, end, contentType);
    });
}

unsigned long long ThreadableBlobRegistry::blobSize(const URL& url)
{
    if (isMainThread())
        return blobRegistry().blobSize(url);

    unsigned long long resultSize;
    callOnMainThreadAndWait([url = url.isolatedCopy(), &resultSize] {
        resultSize = blobRegistry().blobSize(url);
    });
    return resultSize;
}

void ThreadableBlobRegistry::unregisterBlobURL(const URL& url)
{
    if (isBlobURLContainsNullOrigin(url))
        originMap()->remove(url.string());

    ensureOnMainThread([url = url.isolatedCopy()] {
        blobRegistry().unregisterBlobURL(url);
    });
}

void ThreadableBlobRegistry::registerBlobURLHandle(const URL& url)
{
    ensureOnMainThread([url = url.isolatedCopy()] {
        blobRegistry().registerBlobURLHandle(url);
    });
}

void ThreadableBlobRegistry::unregisterBlobURLHandle(const URL& url)
{
    ensureOnMainThread([url = url.isolatedCopy()] {
        blobRegistry().unregisterBlobURLHandle(url);
    });
}

RefPtr<SecurityOrigin> ThreadableBlobRegistry::getCachedOrigin(const URL& url)
{
    if (auto cachedOrigin = originMap()->get(url.string()))
        return cachedOrigin;

    if (!url.protocolIsBlob() || !isBlobURLContainsNullOrigin(url))
        return nullptr;

    // If we do not have a cached origin for null blob URLs, we use a unique origin.
    return SecurityOrigin::createUnique();
}

} // namespace WebCore