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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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 */
// data implementation
#include "nsDataChannel.h"
#include "mozilla/Base64.h"
#include "nsDataHandler.h"
#include "nsIInputStream.h"
#include "nsEscape.h"
#include "nsStringStream.h"
#include "nsIObserverService.h"
#include "mozilla/dom/ContentParent.h"
using namespace mozilla;
* Helper for performing a fallible unescape.
* @param aStr The string to unescape.
* @param aBuffer Buffer to unescape into if necessary.
* @param rv Out: nsresult indicating success or failure of unescaping.
* @return Reference to the string containing the unescaped data.
const nsACString& Unescape(const nsACString& aStr, nsACString& aBuffer,
nsresult* rv) {
bool appended = false;
*rv = NS_UnescapeURL(aStr.Data(), aStr.Length(), /* aFlags = */ 0, aBuffer,
appended, mozilla::fallible);
if (NS_FAILED(*rv) || !appended) {
return aStr;
return aBuffer;
nsresult nsDataChannel::OpenContentStream(bool async, nsIInputStream** result,
nsIChannel** channel) {
nsresult rv;
// In order to avoid potentially building up a new path including the
// ref portion of the URI, which we don't care about, we clone a version
// of the URI that does not have a ref and in most cases should share
// string buffers with the original URI.
nsCOMPtr<nsIURI> uri;
rv = NS_GetURIWithoutRef(URI(), getter_AddRefs(uri));
if (NS_FAILED(rv)) return rv;
nsAutoCString path;
rv = uri->GetPathQueryRef(path);
if (NS_FAILED(rv)) return rv;
nsCString contentType, contentCharset;
nsDependentCSubstring dataRange;
bool lBase64;
rv = nsDataHandler::ParsePathWithoutRef(path, contentType, &contentCharset,
lBase64, &dataRange, &mMimeType);
if (NS_FAILED(rv)) return rv;
// This will avoid a copy if nothing needs to be unescaped.
nsAutoCString unescapedBuffer;
const nsACString& data = Unescape(dataRange, unescapedBuffer, &rv);
if (NS_FAILED(rv)) {
return rv;
if (lBase64 && &data == &unescapedBuffer) {
// Don't allow spaces in base64-encoded content. This is only
// relevant for escaped spaces; other spaces are stripped in
// NewURI. We know there were no escaped spaces if the data buffer
// wasn't used in |Unescape|.
nsCOMPtr<nsIInputStream> bufInStream;
uint32_t contentLen;
if (lBase64) {
nsAutoCString decodedData;
rv = Base64Decode(data, decodedData);
if (NS_FAILED(rv)) {
// Returning this error code instead of what Base64Decode returns
// (NS_ERROR_ILLEGAL_VALUE) will prevent rendering of redirect response
// content by HTTP channels. It's also more logical error to return.
// Here we know the URL is actually corrupted.
contentLen = decodedData.Length();
rv = NS_NewCStringInputStream(getter_AddRefs(bufInStream), decodedData);
} else {
contentLen = data.Length();
rv = NS_NewCStringInputStream(getter_AddRefs(bufInStream), data);
if (NS_FAILED(rv)) return rv;
mContentLength = contentLen;
// notify "data-channel-opened" observers
return NS_OK;
nsresult nsDataChannel::MaybeSendDataChannelOpenNotification() {
nsCOMPtr<nsIObserverService> obsService = services::GetObserverService();
if (!obsService) {
return NS_OK;
nsCOMPtr<nsILoadInfo> loadInfo;
nsresult rv = GetLoadInfo(getter_AddRefs(loadInfo));
if (NS_FAILED(rv)) {
return rv;
bool isTopLevel;
rv = loadInfo->GetIsTopLevelLoad(&isTopLevel);
if (NS_FAILED(rv)) {
return rv;
uint64_t browsingContextID;
rv = loadInfo->GetBrowsingContextID(&browsingContextID);
if (NS_FAILED(rv)) {
return rv;
if ((browsingContextID != 0 && isTopLevel) ||
!loadInfo->TriggeringPrincipal()->IsSystemPrincipal()) {
"data-channel-opened", nullptr);
return NS_OK;