[NTP::Push] Add Content Suggestions GCM App Handler

components/ntp_snippets/breaking_news/subscription_manager.cc

Index: components/ntp_snippets/breaking_news/subscription_manager.cc
diff --git a/components/ntp_snippets/breaking_news/subscription_manager.cc b/components/ntp_snippets/breaking_news/subscription_manager.cc
index 8f7dbc9a5b3f6f399f4fa12af234b4ab7530c5f3..42495e8181b082f2b88a13207ba4d710b7cf589e 100644
--- a/components/ntp_snippets/breaking_news/subscription_manager.cc
+++ b/components/ntp_snippets/breaking_news/subscription_manager.cc
@@ -15,10 +15,12 @@ using internal::SubscriptionJsonRequest;
 SubscriptionManager::SubscriptionManager(
     scoped_refptr<net::URLRequestContextGetter> url_request_context_getter,
     PrefService* pref_service,
-    const GURL& subscribe_url)
+    const GURL& subscribe_url,
+    const GURL& unsubscribe_url)
     : url_request_context_getter_(std::move(url_request_context_getter)),
       pref_service_(pref_service),
-      subscribe_url_(subscribe_url) {}
+      subscribe_url_(subscribe_url),
+      unsubscribe_url_(unsubscribe_url) {}
 
 SubscriptionManager::~SubscriptionManager() = default;
 
@@ -35,6 +37,13 @@ void SubscriptionManager::Subscribe(const std::string& token) {
       &SubscriptionManager::DidSubscribe, base::Unretained(this)));
 }
 
+bool SubscriptionManager::CanSubscribeNow() {
+  if (subscription_request_) {
+    return false;
+  }
+  return true;
+}
+
 void SubscriptionManager::DidSubscribe(const ntp_snippets::Status& status) {
   subscription_request_.reset();
 
@@ -54,8 +63,46 @@ void SubscriptionManager::DidSubscribe(const ntp_snippets::Status& status) {
   }
 }
 
+bool SubscriptionManager::CanUnsubscribeNow() {
+  if (unsubscription_request_) {
+    return false;
+  }
+  return true;
+}
+
 void SubscriptionManager::Unsubscribe(const std::string& token) {
-  // TODO(mamir): Implement.
+  DCHECK(!unsubscription_request_);
+  unsubscription_token_ = token;
+  SubscriptionJsonRequest::Builder builder;
+  builder.SetToken(token)
+      .SetUrlRequestContextGetter(url_request_context_getter_)
+      .SetUrl(unsubscribe_url_);
+
+  unsubscription_request_ = builder.Build();
+  unsubscription_request_->Start(base::BindOnce(
+      &SubscriptionManager::DidUnsubscribe, base::Unretained(this)));
+}
+
+bool SubscriptionManager::IsSubscribed() {
+  std::string subscription_token_ = pref_service_->GetString(
+      ntp_snippets::prefs::kContentSuggestionsSubscriptionDataToken);
+  return !subscription_token_.empty();
+}
+
+void SubscriptionManager::DidUnsubscribe(const ntp_snippets::Status& status) {
+  unsubscription_request_.reset();
+
+  switch (status.code) {
+    case ntp_snippets::StatusCode::SUCCESS:
+      // In case of successful unsubscription, clear the previously stored data.
+      // TODO(mamir): clear stored region and language.
+      pref_service_->ClearPref(
+          ntp_snippets::prefs::kContentSuggestionsSubscriptionDataToken);
+      break;
+    default:
+      // TODO(mamir): handle failure.
+      break;
+  }
 }
 
 void SubscriptionManager::RegisterProfilePrefs(PrefRegistrySimple* registry) {