tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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MediaError.cpp (2952B)

      1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
      2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
      3 /* This Source Code Form is subject to the terms of the Mozilla Public
      4 * License, v. 2.0. If a copy of the MPL was not distributed with this
      5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
      6 
      7 #include "mozilla/dom/MediaError.h"
      8 
      9 #include "js/Warnings.h"  // JS::WarnASCII
     10 #include "jsapi.h"
     11 #include "mozilla/dom/Document.h"
     12 #include "mozilla/dom/MediaErrorBinding.h"
     13 #include "nsContentUtils.h"
     14 #include "nsIScriptError.h"
     15 
     16 namespace mozilla::dom {
     17 
     18 NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(MediaError, mParent)
     19 NS_IMPL_CYCLE_COLLECTING_ADDREF(MediaError)
     20 NS_IMPL_CYCLE_COLLECTING_RELEASE(MediaError)
     21 
     22 NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(MediaError)
     23  NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
     24  NS_INTERFACE_MAP_ENTRY(nsISupports)
     25 NS_INTERFACE_MAP_END
     26 
     27 MediaError::MediaError(HTMLMediaElement* aParent, uint16_t aCode,
     28                       const nsACString& aMessage)
     29    : mParent(aParent), mCode(aCode), mMessage(aMessage) {}
     30 
     31 void MediaError::GetMessage(nsAString& aResult) const {
     32  // When fingerprinting resistance is enabled, only messages in this list
     33  // can be returned to content script.
     34  static constexpr nsLiteralCString whitelist[] = {
     35      "404: Not Found"_ns
     36      // TODO
     37  };
     38 
     39  const bool shouldBlank = std::find(std::begin(whitelist), std::end(whitelist),
     40                                     mMessage) == std::end(whitelist);
     41 
     42  if (shouldBlank) {
     43    // Print a warning message to JavaScript console to alert developers of
     44    // a non-whitelisted error message.
     45    nsAutoCString message =
     46        nsLiteralCString(
     47            "This error message will be blank when "
     48            "privacy.resistFingerprinting = true."
     49            "  If it is really necessary, please add it to the whitelist in"
     50            " MediaError::GetMessage: ") +
     51        mMessage;
     52    Document* ownerDoc = mParent->OwnerDoc();
     53    AutoJSAPI api;
     54    if (api.Init(ownerDoc->GetScopeObject())) {
     55      // We prefer this API because it can also print to our debug log and
     56      // try server's log viewer.
     57      JS::WarnASCII(api.cx(), "%s", message.get());
     58    } else {
     59      // If failed to use JS::WarnASCII, fall back to
     60      // nsContentUtils::ReportToConsoleNonLocalized, which can only print to
     61      // JavaScript console.
     62      nsContentUtils::ReportToConsoleNonLocalized(
     63          NS_ConvertASCIItoUTF16(message), nsIScriptError::warningFlag,
     64          "MediaError"_ns, ownerDoc);
     65    }
     66 
     67    if (!nsContentUtils::IsCallerChrome() &&
     68        ownerDoc->ShouldResistFingerprinting(RFPTarget::MediaError)) {
     69      aResult.Truncate();
     70      return;
     71    }
     72  }
     73 
     74  CopyUTF8toUTF16(mMessage, aResult);
     75 }
     76 
     77 JSObject* MediaError::WrapObject(JSContext* aCx,
     78                                 JS::Handle<JSObject*> aGivenProto) {
     79  return MediaError_Binding::Wrap(aCx, this, aGivenProto);
     80 }
     81 
     82 }  // namespace mozilla::dom