1 files changed, 235 insertions, 0 deletions
diff --git a/dom/cache/DBAction.cpp b/dom/cache/DBAction.cpp
new file mode 100644
index 0000000000..119242d93c
--- /dev/null
+++ b/dom/cache/DBAction.cpp
@@ -0,0 +1,235 @@
+/* -*- 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 "mozilla/dom/cache/DBAction.h"
+
+#include "mozilla/Assertions.h"
+#include "mozilla/dom/cache/Connection.h"
+#include "mozilla/dom/cache/DBSchema.h"
+#include "mozilla/dom/cache/FileUtils.h"
+#include "mozilla/dom/cache/QuotaClient.h"
+#include "mozilla/dom/quota/PersistenceType.h"
+#include "mozilla/dom/quota/ResultExtensions.h"
+#include "mozilla/net/nsFileProtocolHandler.h"
+#include "mozIStorageConnection.h"
+#include "mozIStorageService.h"
+#include "mozStorageCID.h"
+#include "nsIFile.h"
+#include "nsIURI.h"
+#include "nsIURIMutator.h"
+#include "nsIFileURL.h"
+
+namespace mozilla::dom::cache {
+
+using mozilla::dom::quota::CloneFileAndAppend;
+using mozilla::dom::quota::IsDatabaseCorruptionError;
+
+namespace {
+
+nsresult WipeDatabase(const CacheDirectoryMetadata& aDirectoryMetadata,
+                      nsIFile& aDBFile) {
+  QM_TRY_INSPECT(const auto& dbDir, MOZ_TO_RESULT_INVOKE_MEMBER_TYPED(
+                                        nsCOMPtr<nsIFile>, aDBFile, GetParent));
+
+  QM_TRY(MOZ_TO_RESULT(RemoveNsIFile(aDirectoryMetadata, aDBFile)));
+
+  // Note, the -wal journal file will be automatically deleted by sqlite when
+  // the new database is created.  No need to explicitly delete it here.
+
+  // Delete the morgue as well.
+  QM_TRY(MOZ_TO_RESULT(BodyDeleteDir(aDirectoryMetadata, *dbDir)));
+
+  QM_TRY(MOZ_TO_RESULT(WipePaddingFile(aDirectoryMetadata, dbDir)));
+
+  return NS_OK;
+}
+
+}  // namespace
+
+DBAction::DBAction(Mode aMode) : mMode(aMode) {}
+
+DBAction::~DBAction() = default;
+
+void DBAction::RunOnTarget(
+    SafeRefPtr<Resolver> aResolver,
+    const Maybe<CacheDirectoryMetadata>& aDirectoryMetadata,
+    Data* aOptionalData, const Maybe<CipherKey>& aMaybeCipherKey) {
+  MOZ_ASSERT(!NS_IsMainThread());
+  MOZ_DIAGNOSTIC_ASSERT(aResolver);
+  MOZ_DIAGNOSTIC_ASSERT(aDirectoryMetadata);
+  MOZ_DIAGNOSTIC_ASSERT(aDirectoryMetadata->mDir);
+
+  if (IsCanceled()) {
+    aResolver->Resolve(NS_ERROR_ABORT);
+    return;
+  }
+
+  const auto resolveErr = [&aResolver](const nsresult rv) {
+    aResolver->Resolve(rv);
+  };
+
+  QM_TRY_INSPECT(const auto& dbDir,
+                 CloneFileAndAppend(*(aDirectoryMetadata->mDir), u"cache"_ns),
+                 QM_VOID, resolveErr);
+
+  nsCOMPtr<mozIStorageConnection> conn;
+
+  // Attempt to reuse the connection opened by a previous Action.
+  if (aOptionalData) {
+    conn = aOptionalData->GetConnection();
+  }
+
+  // If there is no previous Action, then we must open one.
+  if (!conn) {
+    QM_TRY_UNWRAP(conn,
+                  OpenConnection(*aDirectoryMetadata, *dbDir, aMaybeCipherKey),
+                  QM_VOID, resolveErr);
+    MOZ_DIAGNOSTIC_ASSERT(conn);
+
+    // Save this connection in the shared Data object so later Actions can
+    // use it.  This avoids opening a new connection for every Action.
+    if (aOptionalData) {
+      // Since we know this connection will be around for as long as the
+      // Cache is open, use our special wrapped connection class.  This
+      // will let us perform certain operations once the Cache origin
+      // is closed.
+      nsCOMPtr<mozIStorageConnection> wrapped = new Connection(conn);
+      aOptionalData->SetConnection(wrapped);
+    }
+  }
+
+  RunWithDBOnTarget(std::move(aResolver), *aDirectoryMetadata, dbDir, conn);
+}
+
+Result<nsCOMPtr<mozIStorageConnection>, nsresult> DBAction::OpenConnection(
+    const CacheDirectoryMetadata& aDirectoryMetadata, nsIFile& aDBDir,
+    const Maybe<CipherKey>& aMaybeCipherKey) {
+  MOZ_ASSERT(!NS_IsMainThread());
+  MOZ_DIAGNOSTIC_ASSERT(aDirectoryMetadata.mDirectoryLockId >= 0);
+
+  QM_TRY_INSPECT(const bool& exists,
+                 MOZ_TO_RESULT_INVOKE_MEMBER(aDBDir, Exists));
+
+  if (!exists) {
+    QM_TRY(OkIf(mMode == Create), Err(NS_ERROR_FILE_NOT_FOUND));
+    QM_TRY(MOZ_TO_RESULT(aDBDir.Create(nsIFile::DIRECTORY_TYPE, 0755)));
+  }
+
+  QM_TRY_INSPECT(const auto& dbFile,
+                 CloneFileAndAppend(aDBDir, kCachesSQLiteFilename));
+
+  QM_TRY_RETURN(OpenDBConnection(aDirectoryMetadata, *dbFile, aMaybeCipherKey));
+}
+
+SyncDBAction::SyncDBAction(Mode aMode) : DBAction(aMode) {}
+
+SyncDBAction::~SyncDBAction() = default;
+
+void SyncDBAction::RunWithDBOnTarget(
+    SafeRefPtr<Resolver> aResolver,
+    const CacheDirectoryMetadata& aDirectoryMetadata, nsIFile* aDBDir,
+    mozIStorageConnection* aConn) {
+  MOZ_ASSERT(!NS_IsMainThread());
+  MOZ_DIAGNOSTIC_ASSERT(aResolver);
+  MOZ_DIAGNOSTIC_ASSERT(aDBDir);
+  MOZ_DIAGNOSTIC_ASSERT(aConn);
+
+  nsresult rv = RunSyncWithDBOnTarget(aDirectoryMetadata, aDBDir, aConn);
+  aResolver->Resolve(rv);
+}
+
+Result<nsCOMPtr<mozIStorageConnection>, nsresult> OpenDBConnection(
+    const CacheDirectoryMetadata& aDirectoryMetadata, nsIFile& aDBFile,
+    const Maybe<CipherKey>& aMaybeCipherKey) {
+  MOZ_ASSERT(!NS_IsMainThread());
+  MOZ_DIAGNOSTIC_ASSERT(aDirectoryMetadata.mDirectoryLockId >= -1);
+  MOZ_DIAGNOSTIC_ASSERT_IF(aDirectoryMetadata.mIsPrivate, aMaybeCipherKey);
+
+  // Use our default file:// protocol handler directly to construct the database
+  // URL.  This avoids any problems if a plugin registers a custom file://
+  // handler.  If such a custom handler used javascript, then we would have a
+  // bad time running off the main thread here.
+  auto handler = MakeRefPtr<nsFileProtocolHandler>();
+  QM_TRY(MOZ_TO_RESULT(handler->Init()));
+
+  QM_TRY_INSPECT(const auto& mutator, MOZ_TO_RESULT_INVOKE_MEMBER_TYPED(
+                                          nsCOMPtr<nsIURIMutator>, handler,
+                                          NewFileURIMutator, &aDBFile));
+
+  const nsCString directoryLockIdClause =
+      "&directoryLockId="_ns +
+      IntToCString(aDirectoryMetadata.mDirectoryLockId);
+
+  const auto keyClause = [&aMaybeCipherKey] {
+    nsAutoCString keyClause;
+    if (aMaybeCipherKey) {
+      keyClause.AssignLiteral("&key=");
+      for (uint8_t byte : CipherStrategy::SerializeKey(*aMaybeCipherKey)) {
+        keyClause.AppendPrintf("%02x", byte);
+      }
+    }
+    return keyClause;
+  }();
+
+  nsCOMPtr<nsIFileURL> dbFileUrl;
+  QM_TRY(MOZ_TO_RESULT(
+      NS_MutateURI(mutator)
+          .SetQuery("cache=private"_ns + directoryLockIdClause + keyClause)
+          .Finalize(dbFileUrl)));
+
+  QM_TRY_INSPECT(const auto& storageService,
+                 MOZ_TO_RESULT_GET_TYPED(nsCOMPtr<mozIStorageService>,
+                                         MOZ_SELECT_OVERLOAD(do_GetService),
+                                         MOZ_STORAGE_SERVICE_CONTRACTID),
+                 Err(NS_ERROR_UNEXPECTED));
+
+  QM_TRY_UNWRAP(
+      auto conn,
+      QM_OR_ELSE_WARN_IF(
+          // Expression.
+          MOZ_TO_RESULT_INVOKE_MEMBER_TYPED(
+              nsCOMPtr<mozIStorageConnection>, storageService,
+              OpenDatabaseWithFileURL, dbFileUrl, ""_ns,
+              mozIStorageService::CONNECTION_DEFAULT),
+          // Predicate.
+          IsDatabaseCorruptionError,
+          // Fallback.
+          ([&aDirectoryMetadata, &aDBFile, &storageService,
+            &dbFileUrl](const nsresult rv)
+               -> Result<nsCOMPtr<mozIStorageConnection>, nsresult> {
+            NS_WARNING("Cache database corrupted. Recreating empty database.");
+
+            // There is nothing else we can do to recover.  Also, this data
+            // can be deleted by QuotaManager at any time anyways.
+            QM_TRY(MOZ_TO_RESULT(WipeDatabase(aDirectoryMetadata, aDBFile)));
+
+            QM_TRY_RETURN(MOZ_TO_RESULT_INVOKE_MEMBER_TYPED(
+                nsCOMPtr<mozIStorageConnection>, storageService,
+                OpenDatabaseWithFileURL, dbFileUrl, ""_ns,
+                mozIStorageService::CONNECTION_DEFAULT));
+          })));
+
+  // Check the schema to make sure it is not too old.
+  QM_TRY_INSPECT(const int32_t& schemaVersion,
+                 MOZ_TO_RESULT_INVOKE_MEMBER(conn, GetSchemaVersion));
+  if (schemaVersion > 0 && schemaVersion < db::kFirstShippedSchemaVersion) {
+    // Close existing connection before wiping database.
+    conn = nullptr;
+
+    QM_TRY(MOZ_TO_RESULT(WipeDatabase(aDirectoryMetadata, aDBFile)));
+
+    QM_TRY_UNWRAP(conn, MOZ_TO_RESULT_INVOKE_MEMBER_TYPED(
+                            nsCOMPtr<mozIStorageConnection>, storageService,
+                            OpenDatabaseWithFileURL, dbFileUrl, ""_ns,
+                            mozIStorageService::CONNECTION_DEFAULT));
+  }
+
+  QM_TRY(MOZ_TO_RESULT(db::InitializeConnection(*conn)));
+
+  return conn;
+}
+
+}  // namespace mozilla::dom::cache