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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 "nsHostObjectProtocolHandler.h"
#include "DOMMediaStream.h"
#include "mozilla/dom/File.h"
#include "mozilla/dom/MediaSource.h"
#include "mozilla/LoadInfo.h"
#include "mozilla/Preferences.h"
#include "nsClassHashtable.h"
#include "nsError.h"
#include "nsHostObjectURI.h"
#include "nsIMemoryReporter.h"
#include "nsIPrincipal.h"
#include "nsIUUIDGenerator.h"
#include "nsNetUtil.h"
using mozilla::dom::BlobImpl;
using mozilla::ErrorResult;
using mozilla::LoadInfo;
// -----------------------------------------------------------------------
// Hash table
struct DataInfo
{
// mObject is expected to be an nsIDOMBlob, DOMMediaStream, or MediaSource
nsCOMPtr<nsISupports> mObject;
nsCOMPtr<nsIPrincipal> mPrincipal;
nsCString mStack;
};
static nsClassHashtable<nsCStringHashKey, DataInfo>* gDataTable;
// Memory reporting for the hash table.
namespace mozilla {
class HostObjectURLsReporter final : public nsIMemoryReporter
{
~HostObjectURLsReporter() {}
public:
NS_DECL_ISUPPORTS
NS_IMETHOD CollectReports(nsIHandleReportCallback* aHandleReport,
nsISupports* aData, bool aAnonymize) override
{
return MOZ_COLLECT_REPORT(
"host-object-urls", KIND_OTHER, UNITS_COUNT,
gDataTable ? gDataTable->Count() : 0,
"The number of host objects stored for access via URLs "
"(e.g. blobs passed to URL.createObjectURL).");
}
};
NS_IMPL_ISUPPORTS(HostObjectURLsReporter, nsIMemoryReporter)
class BlobURLsReporter final : public nsIMemoryReporter
{
public:
NS_DECL_ISUPPORTS
NS_IMETHOD CollectReports(nsIHandleReportCallback* aCallback,
nsISupports* aData, bool aAnonymize) override
{
if (!gDataTable) {
return NS_OK;
}
nsDataHashtable<nsPtrHashKey<nsIDOMBlob>, uint32_t> refCounts;
// Determine number of URLs per blob, to handle the case where it's > 1.
for (auto iter = gDataTable->Iter(); !iter.Done(); iter.Next()) {
nsCOMPtr<nsIDOMBlob> blob =
do_QueryInterface(iter.UserData()->mObject);
if (blob) {
refCounts.Put(blob, refCounts.Get(blob) + 1);
}
}
for (auto iter = gDataTable->Iter(); !iter.Done(); iter.Next()) {
nsCStringHashKey::KeyType key = iter.Key();
DataInfo* info = iter.UserData();
nsCOMPtr<nsIDOMBlob> tmp = do_QueryInterface(info->mObject);
RefPtr<mozilla::dom::Blob> blob =
static_cast<mozilla::dom::Blob*>(tmp.get());
if (blob) {
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;
nsCOMPtr<nsIURI> principalURI;
uint64_t size = 0;
uint32_t refCount = 1;
DebugOnly<bool> blobWasCounted;
blobWasCounted = refCounts.Get(blob, &refCount);
MOZ_ASSERT(blobWasCounted);
MOZ_ASSERT(refCount > 0);
bool isMemoryFile = blob->IsMemoryFile();
if (isMemoryFile) {
ErrorResult rv;
size = blob->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)(nsIDOMBlob*)blob, 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);
}
} else {
// Just report the path for the DOMMediaStream or MediaSource.
nsCOMPtr<mozilla::dom::MediaSource>
ms(do_QueryInterface(info->mObject));
nsAutoCString path;
path = ms ? "media-source-urls/" : "dom-media-stream-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;
}
nsresult rv;
nsIXPConnect* xpc = nsContentUtils::XPConnect();
nsCOMPtr<nsIStackFrame> frame;
rv = xpc->GetCurrentJSStack(getter_AddRefs(frame));
NS_ENSURE_SUCCESS_VOID(rv);
nsAutoCString origin;
nsCOMPtr<nsIURI> principalURI;
if (NS_SUCCEEDED(aInfo->mPrincipal->GetURI(getter_AddRefs(principalURI)))
&& principalURI) {
principalURI->GetPrePath(origin);
}
for (uint32_t i = 0; i < maxFrames && frame; ++i) {
nsString fileNameUTF16;
int32_t lineNumber = 0;
frame->GetFilename(fileNameUTF16);
frame->GetLineNumber(&lineNumber);
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 += ")/";
}
rv = frame->GetCaller(getter_AddRefs(frame));
NS_ENSURE_SUCCESS_VOID(rv);
}
}
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)
} // namespace mozilla
void
nsHostObjectProtocolHandler::Init(void)
{
static bool initialized = false;
if (!initialized) {
initialized = true;
RegisterStrongMemoryReporter(new mozilla::HostObjectURLsReporter());
RegisterStrongMemoryReporter(new mozilla::BlobURLsReporter());
}
}
nsHostObjectProtocolHandler::nsHostObjectProtocolHandler()
{
Init();
}
nsresult
nsHostObjectProtocolHandler::AddDataEntry(const nsACString& aScheme,
nsISupports* aObject,
nsIPrincipal* aPrincipal,
nsACString& aUri)
{
Init();
nsresult rv = GenerateURIString(aScheme, aPrincipal, aUri);
NS_ENSURE_SUCCESS(rv, rv);
if (!gDataTable) {
gDataTable = new nsClassHashtable<nsCStringHashKey, DataInfo>;
}
DataInfo* info = new DataInfo;
info->mObject = aObject;
info->mPrincipal = aPrincipal;
mozilla::BlobURLsReporter::GetJSStackForBlob(info);
gDataTable->Put(aUri, info);
return NS_OK;
}
void
nsHostObjectProtocolHandler::RemoveDataEntry(const nsACString& aUri)
{
if (gDataTable) {
nsCString uriIgnoringRef;
int32_t hashPos = aUri.FindChar('#');
if (hashPos < 0) {
uriIgnoringRef = aUri;
}
else {
uriIgnoringRef = StringHead(aUri, hashPos);
}
gDataTable->Remove(uriIgnoringRef);
if (gDataTable->Count() == 0) {
delete gDataTable;
gDataTable = nullptr;
}
}
}
nsresult
nsHostObjectProtocolHandler::GenerateURIString(const nsACString &aScheme,
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 = aScheme;
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 DataInfo*
GetDataInfo(const nsACString& aUri)
{
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);
}
return res;
}
nsIPrincipal*
nsHostObjectProtocolHandler::GetDataEntryPrincipal(const nsACString& aUri)
{
if (!gDataTable) {
return nullptr;
}
DataInfo* res = GetDataInfo(aUri);
if (!res) {
return nullptr;
}
return res->mPrincipal;
}
void
nsHostObjectProtocolHandler::Traverse(const nsACString& aUri,
nsCycleCollectionTraversalCallback& aCallback)
{
if (!gDataTable) {
return;
}
DataInfo* res;
gDataTable->Get(aUri, &res);
if (!res) {
return;
}
NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(aCallback, "HostObjectProtocolHandler DataInfo.mObject");
aCallback.NoteXPCOMChild(res->mObject);
}
static nsISupports*
GetDataObjectForSpec(const nsACString& aSpec)
{
DataInfo* info = GetDataInfo(aSpec);
return info ? info->mObject : nullptr;
}
static nsISupports*
GetDataObject(nsIURI* aURI)
{
nsCString spec;
aURI->GetSpec(spec);
return GetDataObjectForSpec(spec);
}
// -----------------------------------------------------------------------
// Protocol handler
NS_IMPL_ISUPPORTS(nsHostObjectProtocolHandler, nsIProtocolHandler)
NS_IMETHODIMP
nsHostObjectProtocolHandler::GetDefaultPort(int32_t *result)
{
*result = -1;
return NS_OK;
}
NS_IMETHODIMP
nsHostObjectProtocolHandler::GetProtocolFlags(uint32_t *result)
{
*result = URI_NORELATIVE | URI_NOAUTH | URI_LOADABLE_BY_SUBSUMERS |
URI_IS_LOCAL_RESOURCE | URI_NON_PERSISTABLE;
return NS_OK;
}
NS_IMETHODIMP
nsHostObjectProtocolHandler::NewURI(const nsACString& aSpec,
const char *aCharset,
nsIURI *aBaseURI,
nsIURI **aResult)
{
*aResult = nullptr;
nsresult rv;
DataInfo* info = GetDataInfo(aSpec);
RefPtr<nsHostObjectURI> uri =
new nsHostObjectURI(info ? info->mPrincipal.get() : nullptr);
rv = uri->SetSpec(aSpec);
NS_ENSURE_SUCCESS(rv, rv);
NS_TryToSetImmutable(uri);
uri.forget(aResult);
return NS_OK;
}
NS_IMETHODIMP
nsHostObjectProtocolHandler::NewChannel2(nsIURI* uri,
nsILoadInfo* aLoadInfo,
nsIChannel** result)
{
*result = nullptr;
nsCString spec;
uri->GetSpec(spec);
DataInfo* info = GetDataInfo(spec);
if (!info) {
return NS_ERROR_DOM_BAD_URI;
}
nsCOMPtr<BlobImpl> blob = do_QueryInterface(info->mObject);
if (!blob) {
return NS_ERROR_DOM_BAD_URI;
}
#ifdef DEBUG
{
nsCOMPtr<nsIURIWithPrincipal> uriPrinc = do_QueryInterface(uri);
nsCOMPtr<nsIPrincipal> principal;
uriPrinc->GetPrincipal(getter_AddRefs(principal));
NS_ASSERTION(info->mPrincipal == principal, "Wrong principal!");
}
#endif
ErrorResult rv;
nsCOMPtr<nsIInputStream> stream;
blob->GetInternalStream(getter_AddRefs(stream), rv);
if (NS_WARN_IF(rv.Failed())) {
return rv.StealNSResult();
}
nsAutoString contentType;
blob->GetType(contentType);
nsCOMPtr<nsIChannel> channel;
rv = NS_NewInputStreamChannelInternal(getter_AddRefs(channel),
uri,
stream,
NS_ConvertUTF16toUTF8(contentType),
EmptyCString(), // aContentCharset
aLoadInfo);
if (NS_WARN_IF(rv.Failed())) {
return rv.StealNSResult();
}
nsString type;
blob->GetType(type);
if (blob->IsFile()) {
nsString filename;
blob->GetName(filename);
channel->SetContentDispositionFilename(filename);
}
uint64_t size = blob->GetSize(rv);
if (NS_WARN_IF(rv.Failed())) {
return rv.StealNSResult();
}
channel->SetOriginalURI(uri);
channel->SetContentType(NS_ConvertUTF16toUTF8(type));
channel->SetContentLength(size);
channel.forget(result);
return NS_OK;
}
NS_IMETHODIMP
nsHostObjectProtocolHandler::NewChannel(nsIURI* uri, nsIChannel* *result)
{
return NewChannel2(uri, nullptr, result);
}
NS_IMETHODIMP
nsHostObjectProtocolHandler::AllowPort(int32_t port, const char *scheme,
bool *_retval)
{
// don't override anything.
*_retval = false;
return NS_OK;
}
NS_IMETHODIMP
nsBlobProtocolHandler::GetScheme(nsACString &result)
{
result.AssignLiteral(BLOBURI_SCHEME);
return NS_OK;
}
NS_IMETHODIMP
nsMediaStreamProtocolHandler::GetScheme(nsACString &result)
{
result.AssignLiteral(MEDIASTREAMURI_SCHEME);
return NS_OK;
}
NS_IMETHODIMP
nsMediaSourceProtocolHandler::GetScheme(nsACString &result)
{
result.AssignLiteral(MEDIASOURCEURI_SCHEME);
return NS_OK;
}
NS_IMETHODIMP
nsFontTableProtocolHandler::GetScheme(nsACString &result)
{
result.AssignLiteral(FONTTABLEURI_SCHEME);
return NS_OK;
}
nsresult
NS_GetBlobForBlobURI(nsIURI* aURI, BlobImpl** aBlob)
{
NS_ASSERTION(IsBlobURI(aURI), "Only call this with blob URIs");
*aBlob = nullptr;
nsCOMPtr<BlobImpl> blob = do_QueryInterface(GetDataObject(aURI));
if (!blob) {
return NS_ERROR_DOM_BAD_URI;
}
blob.forget(aBlob);
return NS_OK;
}
nsresult
NS_GetBlobForBlobURISpec(const nsACString& aSpec, BlobImpl** aBlob)
{
*aBlob = nullptr;
nsCOMPtr<BlobImpl> blob = do_QueryInterface(GetDataObjectForSpec(aSpec));
if (!blob) {
return NS_ERROR_DOM_BAD_URI;
}
blob.forget(aBlob);
return NS_OK;
}
nsresult
NS_GetStreamForBlobURI(nsIURI* aURI, nsIInputStream** aStream)
{
RefPtr<BlobImpl> blobImpl;
ErrorResult rv;
rv = NS_GetBlobForBlobURI(aURI, getter_AddRefs(blobImpl));
if (NS_WARN_IF(rv.Failed())) {
return rv.StealNSResult();
}
blobImpl->GetInternalStream(aStream, rv);
if (NS_WARN_IF(rv.Failed())) {
return rv.StealNSResult();
}
return NS_OK;
}
nsresult
NS_GetStreamForMediaStreamURI(nsIURI* aURI, mozilla::DOMMediaStream** aStream)
{
NS_ASSERTION(IsMediaStreamURI(aURI), "Only call this with mediastream URIs");
nsISupports* dataObject = GetDataObject(aURI);
if (!dataObject) {
return NS_ERROR_DOM_BAD_URI;
}
*aStream = nullptr;
return CallQueryInterface(dataObject, aStream);
}
NS_IMETHODIMP
nsFontTableProtocolHandler::NewURI(const nsACString& aSpec,
const char *aCharset,
nsIURI *aBaseURI,
nsIURI **aResult)
{
RefPtr<nsIURI> uri;
// Either you got here via a ref or a fonttable: uri
if (aSpec.Length() && aSpec.CharAt(0) == '#') {
nsresult rv = aBaseURI->CloneIgnoringRef(getter_AddRefs(uri));
NS_ENSURE_SUCCESS(rv, rv);
uri->SetRef(aSpec);
} else {
// Relative URIs (other than #ref) are not meaningful within the
// fonttable: scheme.
// If aSpec is a relative URI -other- than a bare #ref,
// this will leave uri empty, and we'll return a failure code below.
uri = new nsSimpleURI();
uri->SetSpec(aSpec);
}
bool schemeIs;
if (NS_FAILED(uri->SchemeIs(FONTTABLEURI_SCHEME, &schemeIs)) || !schemeIs) {
NS_WARNING("Non-fonttable spec in nsFontTableProtocolHander");
return NS_ERROR_NOT_AVAILABLE;
}
uri.forget(aResult);
return NS_OK;
}
nsresult
NS_GetSourceForMediaSourceURI(nsIURI* aURI, mozilla::dom::MediaSource** aSource)
{
NS_ASSERTION(IsMediaSourceURI(aURI), "Only call this with mediasource URIs");
*aSource = nullptr;
nsCOMPtr<mozilla::dom::MediaSource> source = do_QueryInterface(GetDataObject(aURI));
if (!source) {
return NS_ERROR_DOM_BAD_URI;
}
source.forget(aSource);
return NS_OK;
}
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