Implemented OwnerSettingsService::Set() method.

BUG=230018
TEST=unit_tests:OwnerSettingsServiceChromeOSTest.*

Committed: https://crrev.com/5fa0ee22683b92d67e07c060e8c7a3c4cced51ee
Cr-Commit-Position: refs/heads/master@{#301132}

Review URL: https://codereview.chromium.org/654263003

Cr-Commit-Position: refs/heads/master@{#301328}

2 files changed, 94 insertions, 18 deletions

diff --git a/components/ownership/owner_settings_service.cc b/components/ownership/owner_settings_service.cc
index 56bcbe0..204cdd1 100644
--- a/components/ownership/owner_settings_service.cc
+++ b/components/ownership/owner_settings_service.cc
@@ -12,6 +12,7 @@
 #include "base/message_loop/message_loop.h"
 #include "base/task_runner.h"
 #include "base/task_runner_util.h"
+#include "base/values.h"
 #include "components/ownership/owner_key_util.h"
 #include "crypto/signature_creator.h"
 
@@ -21,13 +22,15 @@ namespace ownership {
 
 namespace {
 
-std::string AssembleAndSignPolicy(scoped_ptr<em::PolicyData> policy,
-                                  crypto::RSAPrivateKey* private_key) {
+scoped_ptr<em::PolicyFetchResponse> AssembleAndSignPolicy(
+    scoped_ptr<em::PolicyData> policy,
+    crypto::RSAPrivateKey* private_key) {
   // Assemble the policy.
-  em::PolicyFetchResponse policy_response;
-  if (!policy->SerializeToString(policy_response.mutable_policy_data())) {
+  scoped_ptr<em::PolicyFetchResponse> policy_response(
+      new em::PolicyFetchResponse());
+  if (!policy->SerializeToString(policy_response->mutable_policy_data())) {
     LOG(ERROR) << "Failed to encode policy payload.";
-    return std::string();
+    return scoped_ptr<em::PolicyFetchResponse>(nullptr).Pass();
   }
 
   // Generate the signature.
@@ -35,19 +38,19 @@ std::string AssembleAndSignPolicy(scoped_ptr<em::PolicyData> policy,
       crypto::SignatureCreator::Create(private_key,
                                        crypto::SignatureCreator::SHA1));
   signature_creator->Update(
-      reinterpret_cast<const uint8*>(policy_response.policy_data().c_str()),
-      policy_response.policy_data().size());
+      reinterpret_cast<const uint8*>(policy_response->policy_data().c_str()),
+      policy_response->policy_data().size());
   std::vector<uint8> signature_bytes;
   std::string policy_blob;
   if (!signature_creator->Final(&signature_bytes)) {
     LOG(ERROR) << "Failed to create policy signature.";
-    return std::string();
+    return scoped_ptr<em::PolicyFetchResponse>(nullptr).Pass();
   }
 
-  policy_response.mutable_policy_data_signature()->assign(
+  policy_response->mutable_policy_data_signature()->assign(
       reinterpret_cast<const char*>(vector_as_array(&signature_bytes)),
       signature_bytes.size());
-  return policy_response.SerializeAsString();
+  return policy_response.Pass();
 }
 
 }  // namepace
@@ -61,6 +64,15 @@ OwnerSettingsService::~OwnerSettingsService() {
   DCHECK(thread_checker_.CalledOnValidThread());
 }
 
+void OwnerSettingsService::AddObserver(Observer* observer) {
+  if (observer && !observers_.HasObserver(observer))
+    observers_.AddObserver(observer);
+}
+
+void OwnerSettingsService::RemoveObserver(Observer* observer) {
+  observers_.RemoveObserver(observer);
+}
+
 bool OwnerSettingsService::IsOwner() {
   DCHECK(thread_checker_.CalledOnValidThread());
   return private_key_.get() && private_key_->key();
@@ -91,6 +103,31 @@ bool OwnerSettingsService::AssembleAndSignPolicyAsync(
       callback);
 }
 
+bool OwnerSettingsService::SetBoolean(const std::string& setting, bool value) {
+  DCHECK(thread_checker_.CalledOnValidThread());
+  base::FundamentalValue in_value(value);
+  return Set(setting, in_value);
+}
+
+bool OwnerSettingsService::SetInteger(const std::string& setting, int value) {
+  DCHECK(thread_checker_.CalledOnValidThread());
+  base::FundamentalValue in_value(value);
+  return Set(setting, in_value);
+}
+
+bool OwnerSettingsService::SetDouble(const std::string& setting, double value) {
+  DCHECK(thread_checker_.CalledOnValidThread());
+  base::FundamentalValue in_value(value);
+  return Set(setting, in_value);
+}
+
+bool OwnerSettingsService::SetString(const std::string& setting,
+                                     const std::string& value) {
+  DCHECK(thread_checker_.CalledOnValidThread());
+  base::StringValue in_value(value);
+  return Set(setting, in_value);
+}
+
 void OwnerSettingsService::ReloadKeypair() {
   ReloadKeypairImpl(
       base::Bind(&OwnerSettingsService::OnKeypairLoaded, as_weak_ptr()));
diff --git a/components/ownership/owner_settings_service.h b/components/ownership/owner_settings_service.h
index 1961975..db36595 100644
--- a/components/ownership/owner_settings_service.h
+++ b/components/ownership/owner_settings_service.h
@@ -13,6 +13,7 @@
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
+#include "base/observer_list.h"
 #include "base/threading/thread_checker.h"
 #include "components/keyed_service/core/keyed_service.h"
 #include "components/ownership/ownership_export.h"
@@ -20,6 +21,7 @@
 
 namespace base {
 class TaskRunner;
+class Value;
 }
 
 namespace ownership {
@@ -31,19 +33,42 @@ class PublicKey;
 // which deal with ownership, keypairs and owner-related settings.
 class OWNERSHIP_EXPORT OwnerSettingsService : public KeyedService {
  public:
-  typedef base::Callback<void(std::string policy_blob)>
+  class Observer {
+   public:
+    virtual ~Observer() {}
+
+    // Called when signed policy was stored, or when an error happed during
+    // policy storage..
+    virtual void OnSignedPolicyStored(bool success) {}
+
+    // Called when tentative changes were made to policy, but the policy still
+    // not signed and stored.
+    //
+    // TODO (ygorshenin@, crbug.com/230018): get rid of the method
+    // since it creates DeviceSettingsService's dependency on
+    // OwnerSettingsService.
+    virtual void OnTentativeChangesInPolicy(
+        const enterprise_management::PolicyData& policy_data) {}
+  };
+
+  typedef base::Callback<void(
+      scoped_ptr<enterprise_management::PolicyFetchResponse> policy_response)>
       AssembleAndSignPolicyAsyncCallback;
 
   typedef base::Callback<void(bool is_owner)> IsOwnerCallback;
 
   explicit OwnerSettingsService(
       const scoped_refptr<ownership::OwnerKeyUtil>& owner_key_util);
-  ~OwnerSettingsService() override;
+  virtual ~OwnerSettingsService();
 
   base::WeakPtr<OwnerSettingsService> as_weak_ptr() {
     return weak_factory_.GetWeakPtr();
   }
 
+  void AddObserver(Observer* observer);
+
+  void RemoveObserver(Observer* observer);
+
   // Returns whether current user is owner or not. When this method
   // is called too early, incorrect result can be returned because
   // private key loading may be in progress.
@@ -60,12 +85,24 @@ class OWNERSHIP_EXPORT OwnerSettingsService : public KeyedService {
       scoped_ptr<enterprise_management::PolicyData> policy,
       const AssembleAndSignPolicyAsyncCallback& callback);
 
-  // Signs |settings| with the private half of the owner key and sends
-  // the resulting policy blob for storage. The
-  // result of the operation is reported through |callback|.
-  virtual void SignAndStorePolicyAsync(
-      scoped_ptr<enterprise_management::PolicyData> policy,
-      const base::Closure& callback) = 0;
+  // Checks whether |setting| is handled by OwnerSettingsService.
+  virtual bool HandlesSetting(const std::string& setting) = 0;
+
+  // Sets |setting| value to |value|.
+  virtual bool Set(const std::string& setting, const base::Value& value) = 0;
+
+  // Sets a bunch of device settings accumulated before ownership gets
+  // established.
+  //
+  // TODO (ygorshenin@, crbug.com/230018): that this is a temporary
+  // solution and should be removed.
+  virtual bool CommitTentativeDeviceSettings(
+      scoped_ptr<enterprise_management::PolicyData> policy) = 0;
+
+  bool SetBoolean(const std::string& setting, bool value);
+  bool SetInteger(const std::string& setting, int value);
+  bool SetDouble(const std::string& setting, double value);
+  bool SetString(const std::string& setting, const std::string& value);
 
  protected:
   void ReloadKeypair();
@@ -89,6 +126,8 @@ class OWNERSHIP_EXPORT OwnerSettingsService : public KeyedService {
 
   std::vector<IsOwnerCallback> pending_is_owner_callbacks_;
 
+  ObserverList<Observer> observers_;
+
   base::ThreadChecker thread_checker_;
 
  private: