[NTP::Push] Adding Breaking News Subscription Manager

components/ntp_snippets/breaking_news/subscription_manager.cc

+// Copyright 2017 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/breaking_news/subscription_manager.h"
+#include "base/bind.h"
+#include "components/ntp_snippets/breaking_news/subscription_json_request.h"
+#include "components/ntp_snippets/pref_names.h"
+#include "components/prefs/pref_service.h"
+
+namespace ntp_snippets {
+
+using internal::SubscriptionJsonRequest;
+
+SubscriptionManager::SubscriptionManager(
+    scoped_refptr<net::URLRequestContextGetter> url_request_context_getter,
+    PrefService* pref_service)
+    : url_request_context_getter_(std::move(url_request_context_getter)),
+      pref_service_(pref_service) {}
+
+SubscriptionManager::~SubscriptionManager() = default;
+
+void SubscriptionManager::Subscribe(const std::string& token) {
+  DCHECK(!subscription_request_);
+  subscription_token_ = token;
+  SubscriptionJsonRequest::Builder builder;
+  builder.SetToken(token)
+      .SetUrlRequestContextGetter(url_request_context_getter_)
+      .SetUrl(subscribe_url_);
+
+  subscription_request_ = builder.Build();
+  subscription_request_->Start(base::BindOnce(
+      &SubscriptionManager::DidSubscribe, base::Unretained(this)));
+}
+
+void SubscriptionManager::DidSubscribe(const ntp_snippets::Status& status) {
+  subscription_request_.reset();
+
+  switch (status.code) {
+    case ntp_snippets::StatusCode::SUCCESS:
+      // In case of successful subscription, store the same data used for
+      // subscription in order to be able to re-subscribe in case of data
+      // change. For now, only the subscription token, but later region and
+      // language will be stored as well.

[fhorschig, 2017/06/06 09:00:26]

Wouldn't "Store the data for re-subscriptions." suffice?
(The successful part is kind of obvious, the rest is captured in the ToDo)

[mamir, 2017/06/06 14:05:23]

Done.

+      // TODO(mamir): store region and language.
+      pref_service_->SetString(
+          ntp_snippets::prefs::kContentSuggestionsSubscriptionToken,
+          subscription_token_);
+      break;
+    default:
+      // TODO(mamir): handle failure.
+      break;
+  }
+}
+
+void SubscriptionManager::Unsubscribe(const std::string& token) {
+  // TODO(mamir): Implement.
+}
+}  // namespace ntp_snippets