Added an instance ID token cache.

PiperOrigin-RevId: 248432139

Author: smiles

app/instance_id/iid_data.fbs

@@ -18,6 +18,14 @@ native_include "app/memory/unique_ptr.h";
 
 namespace firebase.instance_id.internal;
 
+table Token {
+  // Scope of the token. This can be "FCM" for Cloud Messaging tokens or "*"
+  // for tokens to use with services like Remote Config.
+  scope:string;
+  // Instance ID token for the scope.
+  token:string;
+}
+
 table InstanceIdDesktopData {
   // Instance ID, random number generated by the client which acts as a unique
   // identifier when requesting tokens from the IID backend.
@@ -33,6 +41,8 @@ table InstanceIdDesktopData {
   // Time of the last succeessful checkin request in UTC milliseconds since the
   // epoch.
   last_checkin_time_ms:uint64;
+  // Token for each scope.
+  tokens:[Token];
 }
 
 root_type InstanceIdDesktopData;

app/instance_id/instance_id_desktop_impl.cc

@@ -188,10 +188,16 @@ bool InstanceIdDesktopImpl::SaveToStorage() {
   // Build up a serialized buffer algorithmically:
   flatbuffers::FlatBufferBuilder builder;
 
+  std::vector<flatbuffers::Offset<Token>> token_offsets;
+  for (auto it = tokens_.begin(); it != tokens_.end(); ++it) {
+    token_offsets.push_back(CreateTokenDirect(
+        builder, it->first.c_str() /* scope */,
+        it->second.c_str() /* token */));
+  }
   auto iid_data_table = CreateInstanceIdDesktopDataDirect(
       builder, instance_id_.c_str(), checkin_data_.device_id.c_str(),
       checkin_data_.security_token.c_str(), checkin_data_.digest.c_str(),
-      checkin_data_.last_checkin_time_ms);
+      checkin_data_.last_checkin_time_ms, &token_offsets);
   builder.Finish(iid_data_table);
 
   std::string save_string;
@@ -276,6 +282,11 @@ bool InstanceIdDesktopImpl::ReadStoredInstanceIdData(
   checkin_data_.security_token = iid_data_fb->security_token()->c_str();
   checkin_data_.digest = iid_data_fb->digest()->c_str();
   checkin_data_.last_checkin_time_ms = iid_data_fb->last_checkin_time_ms();
+  tokens_.clear();
+  auto fbtokens = iid_data_fb->tokens();
+  for (auto it = fbtokens->begin(); it != fbtokens->end(); ++it) {
+    tokens_[it->scope()->c_str()] = it->token()->c_str();
+  }
   return true;
 }
 

app/instance_id/instance_id_desktop_impl.h

@@ -215,7 +215,10 @@ class InstanceIdDesktopImpl {
   UniquePtr<firebase::app::secure::UserSecureManager> user_secure_manager_;
 
   CheckinData checkin_data_;
+  // Cached instance ID.
   std::string instance_id_;
+  // Tokens indexed by scope.
+  std::map<std::string, std::string> tokens_;
 
   // Locale used to check-in.
   std::string locale_;