📰 The Status card reports disabled sync states

components/ntp_snippets/ntp_snippets_status_service.cc

Index: components/ntp_snippets/ntp_snippets_status_service.cc
diff --git a/components/ntp_snippets/ntp_snippets_status_service.cc b/components/ntp_snippets/ntp_snippets_status_service.cc
new file mode 100644
index 0000000000000000000000000000000000000000..5c279991b1ebb34975ac2d27fd65f4a6e0ad0f53
--- /dev/null
+++ b/components/ntp_snippets/ntp_snippets_status_service.cc
@@ -0,0 +1,80 @@
+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "components/ntp_snippets/ntp_snippets_status_service.h"
+#include "components/signin/core/browser/signin_manager.h"
+#include "components/sync_driver/sync_service.h"
+
+namespace ntp_snippets {
+
+NTPSnippetsStatusService::NTPSnippetsStatusService(
+    SigninManagerBase* signin_manager,
+    sync_driver::SyncService* sync_service)
+    : disabled_reason_(DisabledReason::EXPLICITLY_DISABLED),
+      signin_manager_(signin_manager),
+      sync_service_(sync_service),
+      sync_service_observer_(this) {}
+
+NTPSnippetsStatusService::~NTPSnippetsStatusService() {}
+
+void NTPSnippetsStatusService::Init(
+    const DisabledReasonChangeCallback& callback) {
+  DCHECK(disabled_reason_change_callback_.is_null());
+
+  disabled_reason_change_callback_ = callback;
+
+  // Notify about the current state before registering the observer, to make
+  // sure we don't get a double notification due to an undefined start state.
+  disabled_reason_ = GetDisabledReasonFromDeps();
+  disabled_reason_change_callback_.Run(disabled_reason_);
+
+  sync_service_observer_.Add(sync_service_);
+}
+
+void NTPSnippetsStatusService::OnStateChanged() {
+  DisabledReason new_disabled_reason = GetDisabledReasonFromDeps();
+
+  if (new_disabled_reason == disabled_reason_)
+    return;
+
+  disabled_reason_ = new_disabled_reason;
+  disabled_reason_change_callback_.Run(disabled_reason_);
+}
+
+DisabledReason NTPSnippetsStatusService::GetDisabledReasonFromDeps() const {
+  if (!signin_manager_ || !signin_manager_->IsAuthenticated()) {
+    DVLOG(1) << "[GetNewDisabledReason] Signed out";
+    return DisabledReason::SIGNED_OUT;
+  }
+
+  if (!sync_service_ || !sync_service_->CanSyncStart()) {
+    DVLOG(1) << "[GetNewDisabledReason] Sync disabled";
+    return DisabledReason::SYNC_DISABLED;
+  }
+
+  // !IsSyncActive in cases where CanSyncStart is true hints at the backend not
+  // being initialized.
+  // ConfigurationDone() verifies that the sync service has properly loaded its
+  // configuration and is aware of the different data types to sync.
+  if (!sync_service_->IsSyncActive() || !sync_service_->ConfigurationDone()) {
+    DVLOG(1) << "[GetNewDisabledReason] Sync initialization is not complete.";
+    return DisabledReason::HISTORY_SYNC_STATE_UNKNOWN;
+  }
+
+  if (sync_service_->IsEncryptEverythingEnabled()) {
+    DVLOG(1) << "[GetNewDisabledReason] Encryption is enabled";
+    return DisabledReason::PASSPHRASE_ENCRYPTION_ENABLED;
+  }
+
+  if (!sync_service_->GetActiveDataTypes().Has(
+          syncer::HISTORY_DELETE_DIRECTIVES)) {
+    DVLOG(1) << "[GetNewDisabledReason] History sync disabled";
+    return DisabledReason::HISTORY_SYNC_DISABLED;
+  }
+
+  DVLOG(1) << "[GetNewDisabledReason] Enabled";
+  return DisabledReason::NONE;
+}
+
+}  // namespace ntp_snippets