Linux pairing registry delegate implementation

remoting/protocol/pairing_registry.cc

 // Copyright 2013 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 "remoting/protocol/pairing_registry.h"
 
 #include "base/base64.h"
 #include "base/bind.h"
 #include "base/guid.h"
+#include "base/json/json_string_value_serializer.h"
+#include "base/strings/string_number_conversions.h"
+#include "base/values.h"
 #include "crypto/random.h"
 
+namespace {
+const char kCreatedTimeKey[] = "created-time";
+const char kClientIdKey[] = "client-id";
+const char kClientNameKey[] = "client-name";
+const char kSharedSecretKey[] = "shared-secret";
+}  // namespace
+
 namespace remoting {
 namespace protocol {
 
 // How many bytes of random data to use for the shared secret.
 const int kKeySize = 16;
 
 PairingRegistry::Pairing::Pairing() {
 }
 
 PairingRegistry::Pairing::Pairing(const base::Time& created_time,
@@ skipping 39 matching lines @@
   DCHECK(delegate_);
 }
 
 PairingRegistry::~PairingRegistry() {
 }
 
 PairingRegistry::Pairing PairingRegistry::CreatePairing(
     const std::string& client_name) {
   DCHECK(CalledOnValidThread());
   Pairing result = Pairing::Create(client_name);
-  delegate_->AddPairing(result, AddPairingCallback());
+  AddPairing(result);
   return result;
 }
 
 void PairingRegistry::GetPairing(const std::string& client_id,
                                  const GetPairingCallback& callback) {
   DCHECK(CalledOnValidThread());
-  delegate_->GetPairing(client_id, callback);
+  delegate_->Load(
+      base::Bind(&PairingRegistry::DoGetPairing, this, client_id, callback));
 }
 
-void NotImplementedPairingRegistryDelegate::AddPairing(
-    const PairingRegistry::Pairing& new_paired_client,
-    const PairingRegistry::AddPairingCallback& callback) {
-  NOTIMPLEMENTED();
-  if (!callback.is_null()) {
-    callback.Run(false);
-  }
+void PairingRegistry::AddPairing(const Pairing& pairing) {
+  delegate_->Load(
+      base::Bind(&PairingRegistry::MergePairingAndSave, this, pairing));
 }
 
-void NotImplementedPairingRegistryDelegate::GetPairing(
-    const std::string& client_id,
-    const PairingRegistry::GetPairingCallback& callback) {
-  NOTIMPLEMENTED();
-  callback.Run(PairingRegistry::Pairing());
+void PairingRegistry::MergePairingAndSave(const Pairing& pairing,
+                                          const std::string& pairings_json) {
+  DCHECK(CalledOnValidThread());
+  PairedClients clients = DecodeJson(pairings_json);
+  clients[pairing.client_id()] = pairing;
+  std::string new_pairings_json = EncodeJson(clients);
+  delegate_->Save(new_pairings_json, SaveCallback());
+}
+
+void PairingRegistry::DoGetPairing(const std::string& client_id,
+                                   const GetPairingCallback& callback,
+                                   const std::string& pairings_json) {
+  PairedClients clients = DecodeJson(pairings_json);
+  Pairing result = clients[client_id];
+  callback.Run(result);
+}
+
+PairingRegistry::PairedClients
+PairingRegistry::DecodeJson(const std::string& pairings_json) {

[Sergey Ulanov, 2013/06/21 23:27:55]

nit: normally function name is wrapped only when it doesn't fit on one line with
the type, so more conventional formatting for this function would be

PairingRegistry::PairedClients PairingRegistry::DecodeJson(
    const std::string& pairings_json) {

[Jamie, 2013/06/21 23:33:25]

Done.

+  PairedClients result;
+
+  if (pairings_json.empty()) {
+    return result;
+  }
+
+  JSONStringValueSerializer registry(pairings_json);
+  int error_code;
+  std::string error_message;
+  scoped_ptr<base::Value> root(
+      registry.Deserialize(&error_code, &error_message));
+  if (!root) {
+    LOG(ERROR) << "Failed to load paired clients: " << error_message
+               << " (" << error_code << ").";
+    return result;
+  }
+
+  base::ListValue* root_list = NULL;
+  if (!root->GetAsList(&root_list)) {
+    LOG(ERROR) << "Failed to load paired clients: root node is not a list.";
+    return result;
+  }
+
+  for (size_t i = 0; i < root_list->GetSize(); ++i) {
+    base::DictionaryValue* pairing = NULL;
+    std::string client_name, client_id, shared_secret;
+    double created_time_value;
+    if (root_list->GetDictionary(i, &pairing) &&
+        pairing->GetDouble(kCreatedTimeKey, &created_time_value) &&
+        pairing->GetString(kClientNameKey, &client_name) &&
+        pairing->GetString(kClientIdKey, &client_id) &&
+        pairing->GetString(kSharedSecretKey, &shared_secret)) {
+      base::Time created_time = base::Time::FromJsTime(created_time_value);
+      result[client_id] = Pairing(
+          created_time, client_name, client_id, shared_secret);
+    } else {
+      LOG(ERROR) << "Paired client " << i << " has unexpected format.";
+    }
+  }
+
+  return result;
+}
+
+std::string PairingRegistry::EncodeJson(const PairedClients& clients) {
+  base::ListValue root;
+  for (PairedClients::const_iterator i = clients.begin();
+       i != clients.end(); ++i) {
+    base::DictionaryValue* pairing = new base::DictionaryValue();
+    pairing->SetDouble(kCreatedTimeKey, i->second.created_time().ToJsTime());
+    pairing->SetString(kClientNameKey, i->second.client_name());
+    pairing->SetString(kClientIdKey, i->second.client_id());
+    pairing->SetString(kSharedSecretKey, i->second.shared_secret());
+    root.Append(pairing);
+  }
+
+  std::string result;
+  JSONStringValueSerializer serializer(&result);
+  serializer.Serialize(root);
+
+  return result;
 }
 
 }  // namespace protocol
 }  // namespace remoting