1 files changed, 155 insertions, 0 deletions
diff --git a/toolkit/components/antitracking/PartitioningExceptionList.cpp b/toolkit/components/antitracking/PartitioningExceptionList.cpp
new file mode 100644
index 0000000000..f726a3b63a
--- /dev/null
+++ b/toolkit/components/antitracking/PartitioningExceptionList.cpp
@@ -0,0 +1,155 @@
+/* -*- 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 "PartitioningExceptionList.h"
+
+#include "AntiTrackingLog.h"
+#include "nsContentUtils.h"
+
+#include "mozilla/ClearOnShutdown.h"
+#include "mozilla/StaticPtr.h"
+
+namespace mozilla {
+
+namespace {
+
+inline nsresult CreateExceptionListKey(const nsACString& aFirstPartyOrigin,
+                                       const nsACString& aThirdPartyOrigin,
+                                       nsACString& aExceptionListKey) {
+  MOZ_ASSERT(!aFirstPartyOrigin.IsEmpty());
+  MOZ_ASSERT(!aThirdPartyOrigin.IsEmpty());
+
+  // Don't allow exceptions for everything
+  if (aFirstPartyOrigin.EqualsLiteral("*") &&
+      aThirdPartyOrigin.EqualsLiteral("*")) {
+    return NS_ERROR_ILLEGAL_VALUE;
+  }
+
+  aExceptionListKey.Assign(aFirstPartyOrigin);
+  aExceptionListKey.Append(",");
+  aExceptionListKey.Append(aThirdPartyOrigin);
+
+  return NS_OK;
+}
+
+inline nsresult CreateUnifiedOriginString(const nsACString& aInput,
+                                          nsACString& aOutput) {
+  nsCOMPtr<nsIURI> uri;
+  if (aInput.EqualsLiteral("*")) {
+    aOutput.AssignLiteral("*");
+    return NS_OK;
+  }
+  nsresult rv = NS_NewURI(getter_AddRefs(uri), aInput);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  return nsContentUtils::GetASCIIOrigin(uri, aOutput);
+}
+
+StaticRefPtr<PartitioningExceptionList> gPartitioningExceptionList;
+
+}  // namespace
+
+NS_IMPL_ISUPPORTS(PartitioningExceptionList,
+                  nsIPartitioningExceptionListObserver)
+
+bool PartitioningExceptionList::Check(const nsACString& aFirstPartyOrigin,
+                                      const nsACString& aThirdPartyOrigin) {
+  if (aFirstPartyOrigin.IsEmpty() || aThirdPartyOrigin.IsEmpty()) {
+    return false;
+  }
+
+  LOG(("Check partitioning exception list for url %s and %s",
+       PromiseFlatCString(aFirstPartyOrigin).get(),
+       PromiseFlatCString(aThirdPartyOrigin).get()));
+
+  nsAutoCString key, wildcardFirstPartyKey, wildcardThirdPartyKey;
+  CreateExceptionListKey(aFirstPartyOrigin, aThirdPartyOrigin, key);
+  CreateExceptionListKey("*"_ns, aThirdPartyOrigin, wildcardFirstPartyKey);
+  CreateExceptionListKey(aFirstPartyOrigin, "*"_ns, wildcardThirdPartyKey);
+
+  if (GetOrCreate()->mExceptionList.Contains(key) ||
+      GetOrCreate()->mExceptionList.Contains(wildcardFirstPartyKey) ||
+      GetOrCreate()->mExceptionList.Contains(wildcardThirdPartyKey)) {
+    LOG(("URI is in exception list"));
+    return true;
+  }
+
+  return false;
+}
+
+PartitioningExceptionList* PartitioningExceptionList::GetOrCreate() {
+  if (!gPartitioningExceptionList) {
+    gPartitioningExceptionList = new PartitioningExceptionList();
+    gPartitioningExceptionList->Init();
+
+    RunOnShutdown([&] {
+      gPartitioningExceptionList->Shutdown();
+      gPartitioningExceptionList = nullptr;
+    });
+  }
+
+  return gPartitioningExceptionList;
+}
+
+nsresult PartitioningExceptionList::Init() {
+  mService =
+      do_GetService("@mozilla.org/partitioning/exception-list-service;1");
+  if (NS_WARN_IF(!mService)) {
+    return NS_ERROR_FAILURE;
+  }
+
+  mService->RegisterAndRunExceptionListObserver(this);
+  return NS_OK;
+}
+
+void PartitioningExceptionList::Shutdown() {
+  if (mService) {
+    mService->UnregisterExceptionListObserver(this);
+    mService = nullptr;
+  }
+
+  mExceptionList.Clear();
+}
+
+NS_IMETHODIMP
+PartitioningExceptionList::OnExceptionListUpdate(const nsACString& aList) {
+  mExceptionList.Clear();
+
+  nsresult rv;
+  for (const nsACString& item : aList.Split(';')) {
+    auto origins = item.Split(',');
+    auto originsIt = origins.begin();
+
+    nsAutoCString firstPartyOrigin;
+    rv = CreateUnifiedOriginString(*originsIt, firstPartyOrigin);
+    if (NS_WARN_IF(NS_FAILED(rv))) {
+      return rv;
+    }
+
+    ++originsIt;
+
+    nsAutoCString thirdPartyOrigin;
+    rv = CreateUnifiedOriginString(*originsIt, thirdPartyOrigin);
+    if (NS_WARN_IF(NS_FAILED(rv))) {
+      return rv;
+    }
+
+    nsAutoCString key;
+    rv = CreateExceptionListKey(firstPartyOrigin, thirdPartyOrigin, key);
+    if (NS_WARN_IF(NS_FAILED(rv))) {
+      return rv;
+    }
+    LOG(("onExceptionListUpdate: %s", key.get()));
+
+    mExceptionList.AppendElement(key);
+  }
+
+  return NS_OK;
+}
+
+}  // namespace mozilla