cros: Implement cryptohome backend for pin.

chrome/browser/chromeos/extensions/quick_unlock_private/quick_unlock_private_api.cc

Index: chrome/browser/chromeos/extensions/quick_unlock_private/quick_unlock_private_api.cc
diff --git a/chrome/browser/chromeos/extensions/quick_unlock_private/quick_unlock_private_api.cc b/chrome/browser/chromeos/extensions/quick_unlock_private/quick_unlock_private_api.cc
index d38cf288a3f6112aed53a9c59d2bf552573c830c..67d0b7e28f6b5dd2bc2bcb774acc2837bb341223 100644
--- a/chrome/browser/chromeos/extensions/quick_unlock_private/quick_unlock_private_api.cc
+++ b/chrome/browser/chromeos/extensions/quick_unlock_private/quick_unlock_private_api.cc
@@ -5,6 +5,7 @@
 #include "chrome/browser/chromeos/extensions/quick_unlock_private/quick_unlock_private_api.h"
 
 #include "base/memory/ptr_util.h"
+#include "chrome/browser/chromeos/login/quick_unlock/pin_backend.h"
 #include "chrome/browser/chromeos/login/quick_unlock/quick_unlock_factory.h"
 #include "chrome/browser/chromeos/login/quick_unlock/quick_unlock_storage.h"
 #include "chrome/browser/chromeos/profiles/profile_helper.h"
@@ -45,16 +46,22 @@ const int kMinLengthForNonWeakPin = 2;
 const char* kMostCommonPins[] = {"1212", "1004", "2000", "6969",
                                  "1122", "1313", "2001", "1010"};
 
-// Returns the active set of quick unlock modes.
-QuickUnlockModeList ComputeActiveModes(Profile* profile) {
-  QuickUnlockModeList modes;
-
-  chromeos::quick_unlock::QuickUnlockStorage* quick_unlock_storage =
-      chromeos::quick_unlock::QuickUnlockFactory::GetForProfile(profile);
-  if (quick_unlock_storage && quick_unlock_storage->pin_storage()->IsPinSet())
-    modes.push_back(quick_unlock_private::QUICK_UNLOCK_MODE_PIN);
+using ActiveModeCallback = base::Callback<void(const QuickUnlockModeList&)>;
 
-  return modes;
+// Returns the active set of quick unlock modes.
+void ComputeActiveModes(Profile* profile, const ActiveModeCallback& result) {
+  user_manager::User* user =
+      chromeos::ProfileHelper::Get()->GetUserByProfile(profile);
+  chromeos::quick_unlock::PinBackend::IsSet(
+      user->GetAccountId(),
+      base::Bind(
+          [](const ActiveModeCallback& result, bool is_set) {
+            QuickUnlockModeList modes;
+            if (is_set)
+              modes.push_back(quick_unlock_private::QUICK_UNLOCK_MODE_PIN);
+            result.Run(modes);
+          },
+          result));
 }
 
 // Returns true if |a| and |b| contain the same elements. The elements do not
@@ -197,9 +204,17 @@ QuickUnlockPrivateGetActiveModesFunction::
 
 ExtensionFunction::ResponseAction
 QuickUnlockPrivateGetActiveModesFunction::Run() {
-  const QuickUnlockModeList modes =
-      ComputeActiveModes(chrome_details_.GetProfile());
-  return RespondNow(ArgumentList(GetActiveModes::Results::Create(modes)));
+  ComputeActiveModes(
+      chrome_details_.GetProfile(),
+      base::Bind(&QuickUnlockPrivateGetActiveModesFunction::OnGetActiveModes,
+                 this));
+
+  return RespondLater();
+}
+
+void QuickUnlockPrivateGetActiveModesFunction::OnGetActiveModes(
+    const std::vector<api::quick_unlock_private::QuickUnlockMode>& modes) {
+  Respond(ArgumentList(GetActiveModes::Results::Create(modes)));
 }
 
 // quickUnlockPrivate.checkCredential
@@ -362,12 +377,17 @@ void QuickUnlockPrivateSetModesFunction::OnAuthFailure(
 
 void QuickUnlockPrivateSetModesFunction::OnAuthSuccess(
     const chromeos::UserContext& user_context) {
-  const QuickUnlockModeList initial_modes =
-      ComputeActiveModes(chrome_details_.GetProfile());
-  ApplyModeChange();
-  const QuickUnlockModeList updated_modes =
-      ComputeActiveModes(chrome_details_.GetProfile());
+  ComputeActiveModes(
+      chrome_details_.GetProfile(),
+      base::Bind(
+          &QuickUnlockPrivateSetModesFunction::OnGetActiveModesAfterAuthSuccess,
+          base::Unretained(this), user_context));
+}
 
+void QuickUnlockPrivateSetModesFunction::OnGetActiveModesAfterAuthSuccess(
+    const chromeos::UserContext& user_context,
+    const std::vector<QuickUnlockMode>& initial_modes) {
+  std::vector<QuickUnlockMode> updated_modes = ApplyModeChange(user_context);
   if (!AreModesEqual(initial_modes, updated_modes))
     FireEvent(updated_modes);
 
@@ -375,7 +395,9 @@ void QuickUnlockPrivateSetModesFunction::OnAuthSuccess(
   Release();  // Balanced in Run().
 }
 
-void QuickUnlockPrivateSetModesFunction::ApplyModeChange() {
+std::vector<QuickUnlockMode>
+QuickUnlockPrivateSetModesFunction::ApplyModeChange(
+    const chromeos::UserContext& user_context) {
   // This function is setup so it is easy to add another quick unlock mode while
   // following all of the invariants, which are:
   //
@@ -383,6 +405,8 @@ void QuickUnlockPrivateSetModesFunction::ApplyModeChange() {
   // 2: If a credential for an unlock type is empty, it should not be touched.
   // 3: Otherwise, the credential should be set to the new value.
 
+  std::vector<QuickUnlockMode> newly_active_modes;
+
   bool update_pin = true;
   std::string pin_credential;
 
@@ -394,22 +418,25 @@ void QuickUnlockPrivateSetModesFunction::ApplyModeChange() {
     if (mode == quick_unlock_private::QUICK_UNLOCK_MODE_PIN) {
       update_pin = !credential.empty();
       pin_credential = credential;
+      newly_active_modes.push_back(QuickUnlockMode::QUICK_UNLOCK_MODE_PIN);
     }
   }
 
   // Apply changes.
   if (update_pin) {
-    Profile* profile = chrome_details_.GetProfile();
-    chromeos::quick_unlock::QuickUnlockStorage* quick_unlock_storage =
-        chromeos::quick_unlock::QuickUnlockFactory::GetForProfile(profile);
-
     if (pin_credential.empty()) {
-      quick_unlock_storage->pin_storage()->RemovePin();
+      chromeos::quick_unlock::PinBackend::Remove(user_context);
     } else {
-      quick_unlock_storage->pin_storage()->SetPin(pin_credential);
+      chromeos::quick_unlock::PinBackend::Set(user_context, pin_credential);
+
+      Profile* profile = chrome_details_.GetProfile();
+      chromeos::quick_unlock::QuickUnlockStorage* quick_unlock_storage =
+          chromeos::quick_unlock::QuickUnlockFactory::GetForProfile(profile);
       quick_unlock_storage->MarkStrongAuth();
     }
   }
+
+  return newly_active_modes;
 }
 
 // Triggers a quickUnlockPrivate.onActiveModesChanged change event.