Added support for logging in with Stellar

* Added PAMSG_STELLAR_LOGIN / PAMSG_STELLAR_LOGIN_RESPONSE, which is
  used by the client to request a login token that can be signed using a
  Stellar wallet.

* Added uWebSockets dependency, used to listen for a separate server
  that verifies signed tokens (the Stellar Bridge). When a token is
  verified, it is sent to manaserv-account, which then sends a
  APMSG_LOGIN_RESPONSE to the client matching the token.

* Added RapidJSON dependency to parse the JSON WebSocket messages.

* To keep everything in a single thread, uWebSockets is now driving the
  event loop. Processing of ENet hosts, writing stats and expired bans
  have been moved to uSocket timers.

* C++ standard updated to C++17, as required by uWebSockets.

When Stellar is used to login, the public key is used as the username.
It might be better to introduce an explicit field for this, especially
when we want to enable an account to feature both Stellar login as well
as login with username / password.

1 files changed, 8 insertions, 2 deletions

diff --git a/src/account-server/accounthandler.h b/src/account-server/accounthandler.h
index f1ffcfe2..c27b00ed 100644
--- a/src/account-server/accounthandler.h
+++ b/src/account-server/accounthandler.h
@@ -23,6 +23,8 @@
 
 #include <string>
 
+class ConnectionHandler;
+
 namespace AccountClientHandler
 {
     /**
@@ -37,14 +39,18 @@ namespace AccountClientHandler
     void deinitialize();
 
     /**
+     * Returns the connection handler.
+     */
+    ConnectionHandler *getConnectionHandler();
+
+    /**
      * Prepares a connection for a client coming from a game server.
      */
     void prepareReconnect(const std::string &token, int accountID);
 
     /**
-     * Processes messages received by the connection handler.
      */
-    void process();
+    void handleStellarLogin(const std::string &token, const std::string &pubKey);
 }
 
 #endif // ACCOUNTHANDLER_H