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gecko-dev/dom/file/uri/BlobURLProtocolHandler.cpp

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "BlobURLProtocolHandler.h"
#include "BlobURLChannel.h"
#include "mozilla/dom/BlobURL.h"
#include "mozilla/dom/ChromeUtils.h"
#include "mozilla/dom/ContentChild.h"
#include "mozilla/dom/ContentParent.h"
#include "mozilla/dom/Exceptions.h"
#include "mozilla/dom/BlobImpl.h"
#include "mozilla/dom/IPCBlobUtils.h"
#include "mozilla/dom/MediaSource.h"
#include "mozilla/ipc/IPCStreamUtils.h"
#include "mozilla/LoadInfo.h"
#include "mozilla/NullPrincipal.h"
#include "mozilla/Preferences.h"
#include "mozilla/SystemGroup.h"
#include "nsClassHashtable.h"
#include "nsContentUtils.h"
#include "nsError.h"
#include "nsIAsyncShutdown.h"
#include "nsIException.h" // for nsIStackFrame
#include "nsIMemoryReporter.h"
#include "nsIPrincipal.h"
#include "nsIUUIDGenerator.h"
#include "nsNetUtil.h"
#define RELEASING_TIMER 5000
namespace mozilla {
using namespace ipc;
namespace dom {
// -----------------------------------------------------------------------
// Hash table
struct DataInfo {
enum ObjectType { eBlobImpl, eMediaSource };
DataInfo(BlobImpl* aBlobImpl, nsIPrincipal* aPrincipal)
: mObjectType(eBlobImpl),
mBlobImpl(aBlobImpl),
mPrincipal(aPrincipal),
mRevoked(false) {
MOZ_ASSERT(aPrincipal);
}
DataInfo(MediaSource* aMediaSource, nsIPrincipal* aPrincipal)
: mObjectType(eMediaSource),
mMediaSource(aMediaSource),
mPrincipal(aPrincipal),
mRevoked(false) {
MOZ_ASSERT(aPrincipal);
}
ObjectType mObjectType;
RefPtr<BlobImpl> mBlobImpl;
RefPtr<MediaSource> mMediaSource;
nsCOMPtr<nsIPrincipal> mPrincipal;
nsCString mStack;
// When a blobURL is revoked, we keep it alive for RELEASING_TIMER
// milliseconds in order to support pending operations such as navigation,
// download and so on.
bool mRevoked;
};
// The mutex is locked whenever gDataTable is changed, or if gDataTable
// is accessed off-main-thread.
static StaticMutex sMutex;
// All changes to gDataTable must happen on the main thread, while locking
// sMutex. Reading from gDataTable on the main thread may happen without
// locking, since no changes are possible. Reading it from another thread
// must also lock sMutex to prevent data races.
static nsClassHashtable<nsCStringHashKey, DataInfo>* gDataTable;
static DataInfo* GetDataInfo(const nsACString& aUri,
bool aAlsoIfRevoked = false) {
if (!gDataTable) {
return nullptr;
}
DataInfo* res;
// Let's remove any fragment and query from this URI.
int32_t hasFragmentPos = aUri.FindChar('#');
int32_t hasQueryPos = aUri.FindChar('?');
int32_t pos = -1;
if (hasFragmentPos >= 0 && hasQueryPos >= 0) {
pos = std::min(hasFragmentPos, hasQueryPos);
} else if (hasFragmentPos >= 0) {
pos = hasFragmentPos;
} else {
pos = hasQueryPos;
}
if (pos < 0) {
gDataTable->Get(aUri, &res);
} else {
gDataTable->Get(StringHead(aUri, pos), &res);
}
if (!aAlsoIfRevoked && res && res->mRevoked) {
return nullptr;
}
return res;
}
static DataInfo* GetDataInfoFromURI(nsIURI* aURI, bool aAlsoIfRevoked = false) {
if (!aURI) {
return nullptr;
}
nsCString spec;
nsresult rv = aURI->GetSpec(spec);
if (NS_WARN_IF(NS_FAILED(rv))) {
return nullptr;
}
return GetDataInfo(spec, aAlsoIfRevoked);
}
// Memory reporting for the hash table.
void BroadcastBlobURLRegistration(const nsACString& aURI, BlobImpl* aBlobImpl,
nsIPrincipal* aPrincipal) {
MOZ_ASSERT(NS_IsMainThread());
MOZ_ASSERT(aBlobImpl);
MOZ_ASSERT(aPrincipal);
if (XRE_IsParentProcess()) {
dom::ContentParent::BroadcastBlobURLRegistration(aURI, aBlobImpl,
aPrincipal);
return;
}
dom::ContentChild* cc = dom::ContentChild::GetSingleton();
IPCBlob ipcBlob;
nsresult rv = IPCBlobUtils::Serialize(aBlobImpl, cc, ipcBlob);
if (NS_WARN_IF(NS_FAILED(rv))) {
return;
}
Unused << NS_WARN_IF(!cc->SendStoreAndBroadcastBlobURLRegistration(
nsCString(aURI), ipcBlob, IPC::Principal(aPrincipal)));
}
void BroadcastBlobURLUnregistration(const nsCString& aURI) {
MOZ_ASSERT(NS_IsMainThread());
if (XRE_IsParentProcess()) {
dom::ContentParent::BroadcastBlobURLUnregistration(aURI);
return;
}
dom::ContentChild* cc = dom::ContentChild::GetSingleton();
Unused << NS_WARN_IF(!cc->SendUnstoreAndBroadcastBlobURLUnregistration(aURI));
}
class BlobURLsReporter final : public nsIMemoryReporter {
public:
NS_DECL_ISUPPORTS
NS_IMETHOD CollectReports(nsIHandleReportCallback* aCallback,
nsISupports* aData, bool aAnonymize) override {
MOZ_ASSERT(NS_IsMainThread(),
"without locking gDataTable is main-thread only");
if (!gDataTable) {
return NS_OK;
}
nsDataHashtable<nsPtrHashKey<BlobImpl>, uint32_t> refCounts;
// Determine number of URLs per BlobImpl, to handle the case where it's > 1.
for (auto iter = gDataTable->Iter(); !iter.Done(); iter.Next()) {
if (iter.UserData()->mObjectType != DataInfo::eBlobImpl) {
continue;
}
BlobImpl* blobImpl = iter.UserData()->mBlobImpl;
MOZ_ASSERT(blobImpl);
refCounts.Put(blobImpl, refCounts.Get(blobImpl) + 1);
}
for (auto iter = gDataTable->Iter(); !iter.Done(); iter.Next()) {
nsCStringHashKey::KeyType key = iter.Key();
DataInfo* info = iter.UserData();
if (iter.UserData()->mObjectType == DataInfo::eBlobImpl) {
BlobImpl* blobImpl = iter.UserData()->mBlobImpl;
MOZ_ASSERT(blobImpl);
NS_NAMED_LITERAL_CSTRING(
desc,
"A blob URL allocated with URL.createObjectURL; the referenced "
"blob cannot be freed until all URLs for it have been explicitly "
"invalidated with URL.revokeObjectURL.");
nsAutoCString path, url, owner, specialDesc;
uint64_t size = 0;
uint32_t refCount = 1;
DebugOnly<bool> blobImplWasCounted;
blobImplWasCounted = refCounts.Get(blobImpl, &refCount);
MOZ_ASSERT(blobImplWasCounted);
MOZ_ASSERT(refCount > 0);
bool isMemoryFile = blobImpl->IsMemoryFile();
if (isMemoryFile) {
ErrorResult rv;
size = blobImpl->GetSize(rv);
if (NS_WARN_IF(rv.Failed())) {
rv.SuppressException();
size = 0;
}
}
path = isMemoryFile ? "memory-blob-urls/" : "file-blob-urls/";
BuildPath(path, key, info, aAnonymize);
if (refCount > 1) {
nsAutoCString addrStr;
addrStr = "0x";
addrStr.AppendInt((uint64_t)(BlobImpl*)blobImpl, 16);
path += " ";
path.AppendInt(refCount);
path += "@";
path += addrStr;
specialDesc = desc;
specialDesc += "\n\nNOTE: This blob (address ";
specialDesc += addrStr;
specialDesc += ") has ";
specialDesc.AppendInt(refCount);
specialDesc += " URLs.";
if (isMemoryFile) {
specialDesc += " Its size is divided ";
specialDesc += refCount > 2 ? "among" : "between";
specialDesc += " them in this report.";
}
}
const nsACString& descString =
specialDesc.IsEmpty() ? static_cast<const nsACString&>(desc)
: static_cast<const nsACString&>(specialDesc);
if (isMemoryFile) {
aCallback->Callback(EmptyCString(), path, KIND_OTHER, UNITS_BYTES,
size / refCount, descString, aData);
} else {
aCallback->Callback(EmptyCString(), path, KIND_OTHER, UNITS_COUNT, 1,
descString, aData);
}
continue;
}
// Just report the path for the MediaSource.
nsAutoCString path;
path = "media-source-urls/";
BuildPath(path, key, info, aAnonymize);
NS_NAMED_LITERAL_CSTRING(
desc,
"An object URL allocated with URL.createObjectURL; the referenced "
"data cannot be freed until all URLs for it have been explicitly "
"invalidated with URL.revokeObjectURL.");
aCallback->Callback(EmptyCString(), path, KIND_OTHER, UNITS_COUNT, 1,
desc, aData);
}
return NS_OK;
}
// Initialize info->mStack to record JS stack info, if enabled.
// The string generated here is used in ReportCallback, below.
static void GetJSStackForBlob(DataInfo* aInfo) {
nsCString& stack = aInfo->mStack;
MOZ_ASSERT(stack.IsEmpty());
const uint32_t maxFrames =
Preferences::GetUint("memory.blob_report.stack_frames");
if (maxFrames == 0) {
return;
}
nsCOMPtr<nsIStackFrame> frame = dom::GetCurrentJSStack(maxFrames);
nsAutoCString origin;
nsCOMPtr<nsIURI> principalURI;
if (NS_SUCCEEDED(aInfo->mPrincipal->GetURI(getter_AddRefs(principalURI))) &&
principalURI) {
principalURI->GetPrePath(origin);
}
// If we got a frame, we better have a current JSContext. This is cheating
// a bit; ideally we'd have our caller pass in a JSContext, or have
// GetCurrentJSStack() hand out the JSContext it found.
JSContext* cx = frame ? nsContentUtils::GetCurrentJSContext() : nullptr;
for (uint32_t i = 0; frame; ++i) {
nsString fileNameUTF16;
frame->GetFilename(cx, fileNameUTF16);
int32_t lineNumber = frame->GetLineNumber(cx);
if (!fileNameUTF16.IsEmpty()) {
NS_ConvertUTF16toUTF8 fileName(fileNameUTF16);
stack += "js(";
if (!origin.IsEmpty()) {
// Make the file name root-relative for conciseness if possible.
const char* originData;
uint32_t originLen;
originLen = origin.GetData(&originData);
// If fileName starts with origin + "/", cut up to that "/".
if (fileName.Length() >= originLen + 1 &&
memcmp(fileName.get(), originData, originLen) == 0 &&
fileName[originLen] == '/') {
fileName.Cut(0, originLen);
}
}
fileName.ReplaceChar('/', '\\');
stack += fileName;
if (lineNumber > 0) {
stack += ", line=";
stack.AppendInt(lineNumber);
}
stack += ")/";
}
frame = frame->GetCaller(cx);
}
}
private:
~BlobURLsReporter() {}
static void BuildPath(nsAutoCString& path, nsCStringHashKey::KeyType aKey,
DataInfo* aInfo, bool anonymize) {
nsCOMPtr<nsIURI> principalURI;
nsAutoCString url, owner;
if (NS_SUCCEEDED(aInfo->mPrincipal->GetURI(getter_AddRefs(principalURI))) &&
principalURI != nullptr && NS_SUCCEEDED(principalURI->GetSpec(owner)) &&
!owner.IsEmpty()) {
owner.ReplaceChar('/', '\\');
path += "owner(";
if (anonymize) {
path += "<anonymized>";
} else {
path += owner;
}
path += ")";
} else {
path += "owner unknown";
}
path += "/";
if (anonymize) {
path += "<anonymized-stack>";
} else {
path += aInfo->mStack;
}
url = aKey;
url.ReplaceChar('/', '\\');
if (anonymize) {
path += "<anonymized-url>";
} else {
path += url;
}
}
};
NS_IMPL_ISUPPORTS(BlobURLsReporter, nsIMemoryReporter)
class ReleasingTimerHolder final : public Runnable,
public nsITimerCallback,
public nsIAsyncShutdownBlocker {
public:
NS_DECL_ISUPPORTS_INHERITED
static void Create(const nsACString& aURI) {
MOZ_ASSERT(NS_IsMainThread());
RefPtr<ReleasingTimerHolder> holder = new ReleasingTimerHolder(aURI);
auto raii = MakeScopeExit([holder] { holder->CancelTimerAndRevokeURI(); });
nsresult rv = SystemGroup::EventTargetFor(TaskCategory::Other)
->Dispatch(holder.forget());
NS_ENSURE_SUCCESS_VOID(rv);
raii.release();
}
// Runnable interface
NS_IMETHOD
Run() override {
RefPtr<ReleasingTimerHolder> self = this;
auto raii = MakeScopeExit([self] { self->CancelTimerAndRevokeURI(); });
nsresult rv = NS_NewTimerWithCallback(
getter_AddRefs(mTimer), this, RELEASING_TIMER, nsITimer::TYPE_ONE_SHOT,
SystemGroup::EventTargetFor(TaskCategory::Other));
NS_ENSURE_SUCCESS(rv, NS_OK);
nsCOMPtr<nsIAsyncShutdownClient> phase = GetShutdownPhase();
NS_ENSURE_TRUE(!!phase, NS_OK);
rv = phase->AddBlocker(this, NS_LITERAL_STRING(__FILE__), __LINE__,
NS_LITERAL_STRING("ReleasingTimerHolder shutdown"));
NS_ENSURE_SUCCESS(rv, NS_OK);
raii.release();
return NS_OK;
}
// nsITimerCallback interface
NS_IMETHOD
Notify(nsITimer* aTimer) override {
RevokeURI();
return NS_OK;
}
#ifdef MOZ_COLLECTING_RUNNABLE_TELEMETRY
using nsINamed::GetName;
#endif
// nsIAsyncShutdownBlocker interface
NS_IMETHOD
GetName(nsAString& aName) override {
aName.AssignLiteral("ReleasingTimerHolder for blobURL: ");
aName.Append(NS_ConvertUTF8toUTF16(mURI));
return NS_OK;
}
NS_IMETHOD
BlockShutdown(nsIAsyncShutdownClient* aClient) override {
CancelTimerAndRevokeURI();
return NS_OK;
}
NS_IMETHOD
GetState(nsIPropertyBag**) override { return NS_OK; }
private:
explicit ReleasingTimerHolder(const nsACString& aURI)
: Runnable("ReleasingTimerHolder"), mURI(aURI) {}
~ReleasingTimerHolder() {}
void RevokeURI() {
// Remove the shutting down blocker
nsCOMPtr<nsIAsyncShutdownClient> phase = GetShutdownPhase();
if (phase) {
phase->RemoveBlocker(this);
}
MOZ_ASSERT(NS_IsMainThread(),
"without locking gDataTable is main-thread only");
DataInfo* info =
GetDataInfo(mURI, true /* We care about revoked dataInfo */);
if (!info) {
// Already gone!
return;
}
MOZ_ASSERT(info->mRevoked);
StaticMutexAutoLock lock(sMutex);
gDataTable->Remove(mURI);
if (gDataTable->Count() == 0) {
delete gDataTable;
gDataTable = nullptr;
}
}
void CancelTimerAndRevokeURI() {
if (mTimer) {
mTimer->Cancel();
mTimer = nullptr;
}
RevokeURI();
}
static nsCOMPtr<nsIAsyncShutdownClient> GetShutdownPhase() {
nsCOMPtr<nsIAsyncShutdownService> svc = services::GetAsyncShutdown();
NS_ENSURE_TRUE(!!svc, nullptr);
nsCOMPtr<nsIAsyncShutdownClient> phase;
nsresult rv = svc->GetXpcomWillShutdown(getter_AddRefs(phase));
NS_ENSURE_SUCCESS(rv, nullptr);
return phase;
}
nsCString mURI;
nsCOMPtr<nsITimer> mTimer;
};
NS_IMPL_ISUPPORTS_INHERITED(ReleasingTimerHolder, Runnable, nsITimerCallback,
nsIAsyncShutdownBlocker)
template <typename T>
static nsresult AddDataEntryInternal(const nsACString& aURI, T aObject,
nsIPrincipal* aPrincipal) {
MOZ_ASSERT(NS_IsMainThread(), "changing gDataTable is main-thread only");
StaticMutexAutoLock lock(sMutex);
if (!gDataTable) {
gDataTable = new nsClassHashtable<nsCStringHashKey, DataInfo>;
}
DataInfo* info = new DataInfo(aObject, aPrincipal);
BlobURLsReporter::GetJSStackForBlob(info);
gDataTable->Put(aURI, info);
return NS_OK;
}
void BlobURLProtocolHandler::Init(void) {
static bool initialized = false;
if (!initialized) {
initialized = true;
RegisterStrongMemoryReporter(new BlobURLsReporter());
}
}
BlobURLProtocolHandler::BlobURLProtocolHandler() { Init(); }
BlobURLProtocolHandler::~BlobURLProtocolHandler() = default;
/* static */
nsresult BlobURLProtocolHandler::AddDataEntry(BlobImpl* aBlobImpl,
nsIPrincipal* aPrincipal,
nsACString& aUri) {
MOZ_ASSERT(aBlobImpl);
MOZ_ASSERT(aPrincipal);
Init();
nsresult rv = GenerateURIString(aPrincipal, aUri);
NS_ENSURE_SUCCESS(rv, rv);
rv = AddDataEntryInternal(aUri, aBlobImpl, aPrincipal);
NS_ENSURE_SUCCESS(rv, rv);
BroadcastBlobURLRegistration(aUri, aBlobImpl, aPrincipal);
return NS_OK;
}
/* static */
nsresult BlobURLProtocolHandler::AddDataEntry(MediaSource* aMediaSource,
nsIPrincipal* aPrincipal,
nsACString& aUri) {
MOZ_ASSERT(aMediaSource);
MOZ_ASSERT(aPrincipal);
Init();
nsresult rv = GenerateURIString(aPrincipal, aUri);
NS_ENSURE_SUCCESS(rv, rv);
rv = AddDataEntryInternal(aUri, aMediaSource, aPrincipal);
NS_ENSURE_SUCCESS(rv, rv);
return NS_OK;
}
/* static */
nsresult BlobURLProtocolHandler::AddDataEntry(const nsACString& aURI,
nsIPrincipal* aPrincipal,
BlobImpl* aBlobImpl) {
MOZ_ASSERT(aPrincipal);
MOZ_ASSERT(aBlobImpl);
return AddDataEntryInternal(aURI, aBlobImpl, aPrincipal);
}
/* static */
bool BlobURLProtocolHandler::GetAllBlobURLEntries(
nsTArray<BlobURLRegistrationData>& aRegistrations, ContentParent* aCP) {
MOZ_ASSERT(aCP);
MOZ_ASSERT(NS_IsMainThread(),
"without locking gDataTable is main-thread only");
if (!gDataTable) {
return true;
}
for (auto iter = gDataTable->ConstIter(); !iter.Done(); iter.Next()) {
DataInfo* info = iter.UserData();
MOZ_ASSERT(info);
if (info->mObjectType != DataInfo::eBlobImpl) {
continue;
}
MOZ_ASSERT(info->mBlobImpl);
IPCBlob ipcBlob;
nsresult rv = IPCBlobUtils::Serialize(info->mBlobImpl, aCP, ipcBlob);
if (NS_WARN_IF(NS_FAILED(rv))) {
return false;
}
aRegistrations.AppendElement(BlobURLRegistrationData(
nsCString(iter.Key()), ipcBlob, IPC::Principal(info->mPrincipal),
info->mRevoked));
}
return true;
}
/*static */
void BlobURLProtocolHandler::RemoveDataEntry(const nsACString& aUri,
bool aBroadcastToOtherProcesses) {
MOZ_ASSERT(NS_IsMainThread(), "changing gDataTable is main-thread only");
if (!gDataTable) {
return;
}
DataInfo* info = GetDataInfo(aUri);
if (!info) {
return;
}
{
StaticMutexAutoLock lock(sMutex);
info->mRevoked = true;
}
if (aBroadcastToOtherProcesses && info->mObjectType == DataInfo::eBlobImpl) {
BroadcastBlobURLUnregistration(nsCString(aUri));
}
// The timer will take care of removing the entry for real after
// RELEASING_TIMER milliseconds. In the meantime, the DataInfo, marked as
// revoked, will not be exposed.
ReleasingTimerHolder::Create(aUri);
}
/* static */
void BlobURLProtocolHandler::RemoveDataEntries() {
MOZ_ASSERT(NS_IsMainThread(), "changing gDataTable is main-thread only");
StaticMutexAutoLock lock(sMutex);
if (!gDataTable) {
return;
}
gDataTable->Clear();
delete gDataTable;
gDataTable = nullptr;
}
/* static */
bool BlobURLProtocolHandler::HasDataEntry(const nsACString& aUri) {
MOZ_ASSERT(NS_IsMainThread(),
"without locking gDataTable is main-thread only");
return !!GetDataInfo(aUri);
}
/* static */
nsresult BlobURLProtocolHandler::GenerateURIString(nsIPrincipal* aPrincipal,
nsACString& aUri) {
nsresult rv;
nsCOMPtr<nsIUUIDGenerator> uuidgen =
do_GetService("@mozilla.org/uuid-generator;1", &rv);
NS_ENSURE_SUCCESS(rv, rv);
nsID id;
rv = uuidgen->GenerateUUIDInPlace(&id);
NS_ENSURE_SUCCESS(rv, rv);
char chars[NSID_LENGTH];
id.ToProvidedString(chars);
aUri.AssignLiteral(BLOBURI_SCHEME);
aUri.Append(':');
if (aPrincipal) {
nsAutoCString origin;
rv = nsContentUtils::GetASCIIOrigin(aPrincipal, origin);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
aUri.Append(origin);
aUri.Append('/');
}
aUri += Substring(chars + 1, chars + NSID_LENGTH - 2);
return NS_OK;
}
/* static */
nsIPrincipal* BlobURLProtocolHandler::GetDataEntryPrincipal(
const nsACString& aUri) {
MOZ_ASSERT(NS_IsMainThread(),
"without locking gDataTable is main-thread only");
if (!gDataTable) {
return nullptr;
}
DataInfo* res = GetDataInfo(aUri);
if (!res) {
return nullptr;
}
return res->mPrincipal;
}
/* static */
void BlobURLProtocolHandler::Traverse(
const nsACString& aUri, nsCycleCollectionTraversalCallback& aCallback) {
MOZ_ASSERT(NS_IsMainThread(),
"without locking gDataTable is main-thread only");
if (!gDataTable) {
return;
}
DataInfo* res;
gDataTable->Get(aUri, &res);
if (!res) {
return;
}
NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(
aCallback, "BlobURLProtocolHandler DataInfo.mBlobImpl");
aCallback.NoteXPCOMChild(res->mBlobImpl);
NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(
aCallback, "BlobURLProtocolHandler DataInfo.mMediaSource");
aCallback.NoteXPCOMChild(res->mMediaSource);
}
NS_IMPL_ISUPPORTS(BlobURLProtocolHandler, nsIProtocolHandler,
nsISupportsWeakReference)
NS_IMETHODIMP
BlobURLProtocolHandler::GetDefaultPort(int32_t* result) {
*result = -1;
return NS_OK;
}
NS_IMETHODIMP
BlobURLProtocolHandler::GetProtocolFlags(uint32_t* result) {
*result = URI_NORELATIVE | URI_NOAUTH | URI_LOADABLE_BY_SUBSUMERS |
URI_NON_PERSISTABLE | URI_IS_LOCAL_RESOURCE;
return NS_OK;
}
NS_IMETHODIMP
BlobURLProtocolHandler::GetFlagsForURI(nsIURI* aURI, uint32_t* aResult) {
Unused << BlobURLProtocolHandler::GetProtocolFlags(aResult);
if (IsBlobURI(aURI)) {
*aResult |= URI_IS_LOCAL_RESOURCE;
}
return NS_OK;
}
/* static */ nsresult BlobURLProtocolHandler::CreateNewURI(
const nsACString& aSpec, const char* aCharset, nsIURI* aBaseURI,
nsIURI** aResult) {
*aResult = nullptr;
// This method can be called on any thread, which is why we lock the mutex
// for read access to gDataTable.
bool revoked = true;
{
StaticMutexAutoLock lock(sMutex);
DataInfo* info = GetDataInfo(aSpec);
if (info && info->mObjectType == DataInfo::eBlobImpl) {
revoked = info->mRevoked;
}
}
return NS_MutateURI(new BlobURL::Mutator())
.SetSpec(aSpec)
.Apply(NS_MutatorMethod(&nsIBlobURLMutator::SetRevoked, revoked))
.Finalize(aResult);
}
NS_IMETHODIMP
BlobURLProtocolHandler::NewChannel(nsIURI* aURI, nsILoadInfo* aLoadInfo,
nsIChannel** aResult) {
RefPtr<BlobURLChannel> channel = new BlobURLChannel(aURI, aLoadInfo);
auto raii = MakeScopeExit([&] {
channel->InitFailed();
channel.forget(aResult);
});
RefPtr<BlobURL> blobURL;
nsresult rv =
aURI->QueryInterface(kHOSTOBJECTURICID, getter_AddRefs(blobURL));
if (NS_FAILED(rv) || !blobURL) {
return NS_OK;
}
MOZ_ASSERT(NS_IsMainThread(),
"without locking gDataTable is main-thread only");
DataInfo* info = GetDataInfoFromURI(aURI, true /*aAlsoIfRevoked */);
if (!info || info->mObjectType != DataInfo::eBlobImpl || !info->mBlobImpl) {
return NS_OK;
}
if (blobURL->Revoked()) {
return NS_OK;
}
// We want to be sure that we stop the creation of the channel if the blob URL
// is copy-and-pasted on a different context (ex. private browsing or
// containers).
//
// We also allow the system principal to create the channel regardless of the
// OriginAttributes. This is primarily for the benefit of mechanisms like
// the Download API that explicitly create a channel with the system
// principal and which is never mutated to have a non-zero mPrivateBrowsingId
// or container.
if (aLoadInfo &&
!nsContentUtils::IsSystemPrincipal(aLoadInfo->LoadingPrincipal()) &&
!ChromeUtils::IsOriginAttributesEqualIgnoringFPD(
aLoadInfo->GetOriginAttributes(),
BasePrincipal::Cast(info->mPrincipal)->OriginAttributesRef())) {
return NS_OK;
}
raii.release();
channel->Initialize(info->mBlobImpl);
channel.forget(aResult);
return NS_OK;
}
NS_IMETHODIMP
BlobURLProtocolHandler::AllowPort(int32_t port, const char* scheme,
bool* _retval) {
// don't override anything.
*_retval = false;
return NS_OK;
}
NS_IMETHODIMP
BlobURLProtocolHandler::GetScheme(nsACString& result) {
result.AssignLiteral(BLOBURI_SCHEME);
return NS_OK;
}
/* static */
bool BlobURLProtocolHandler::GetBlobURLPrincipal(nsIURI* aURI,
nsIPrincipal** aPrincipal) {
MOZ_ASSERT(aURI);
MOZ_ASSERT(aPrincipal);
RefPtr<BlobURL> blobURL;
nsresult rv =
aURI->QueryInterface(kHOSTOBJECTURICID, getter_AddRefs(blobURL));
if (NS_FAILED(rv) || !blobURL) {
return false;
}
MOZ_ASSERT(NS_IsMainThread(),
"without locking gDataTable is main-thread only");
DataInfo* info = GetDataInfoFromURI(aURI, true /*aAlsoIfRevoked */);
if (!info || info->mObjectType != DataInfo::eBlobImpl || !info->mBlobImpl) {
return false;
}
nsCOMPtr<nsIPrincipal> principal;
if (blobURL->Revoked()) {
principal = NullPrincipal::Create(
BasePrincipal::Cast(info->mPrincipal)->OriginAttributesRef());
} else {
principal = info->mPrincipal;
}
principal.forget(aPrincipal);
return true;
}
} // namespace dom
} // namespace mozilla
nsresult NS_GetBlobForBlobURI(nsIURI* aURI, BlobImpl** aBlob) {
*aBlob = nullptr;
MOZ_ASSERT(NS_IsMainThread(),
"without locking gDataTable is main-thread only");
DataInfo* info = GetDataInfoFromURI(aURI, false /* aAlsoIfRevoked */);
if (!info || info->mObjectType != DataInfo::eBlobImpl) {
return NS_ERROR_DOM_BAD_URI;
}
RefPtr<BlobImpl> blob = info->mBlobImpl;
blob.forget(aBlob);
return NS_OK;
}
nsresult NS_GetBlobForBlobURISpec(const nsACString& aSpec, BlobImpl** aBlob) {
*aBlob = nullptr;
MOZ_ASSERT(NS_IsMainThread(),
"without locking gDataTable is main-thread only");
DataInfo* info = GetDataInfo(aSpec);
if (!info || info->mObjectType != DataInfo::eBlobImpl) {
return NS_ERROR_DOM_BAD_URI;
}
RefPtr<BlobImpl> blob = info->mBlobImpl;
blob.forget(aBlob);
return NS_OK;
}
nsresult NS_GetSourceForMediaSourceURI(nsIURI* aURI, MediaSource** aSource) {
*aSource = nullptr;
MOZ_ASSERT(NS_IsMainThread(),
"without locking gDataTable is main-thread only");
DataInfo* info = GetDataInfoFromURI(aURI);
if (!info || info->mObjectType != DataInfo::eMediaSource) {
return NS_ERROR_DOM_BAD_URI;
}
RefPtr<MediaSource> mediaSource = info->mMediaSource;
mediaSource.forget(aSource);
return NS_OK;
}
namespace mozilla {
namespace dom {
bool IsType(nsIURI* aUri, DataInfo::ObjectType aType) {
// We lock because this may be called off-main-thread
StaticMutexAutoLock lock(sMutex);
DataInfo* info = GetDataInfoFromURI(aUri);
if (!info) {
return false;
}
return info->mObjectType == aType;
}
bool IsBlobURI(nsIURI* aUri) { return IsType(aUri, DataInfo::eBlobImpl); }
bool IsMediaSourceURI(nsIURI* aUri) {
return IsType(aUri, DataInfo::eMediaSource);
}
} // namespace dom
} // namespace mozilla
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