Add authorization to Redis instances with passwords

Author: Mordil

Sources/NIORedis/Commands/BasicCommands.swift

@@ -11,6 +11,13 @@ extension NIORedisConnection {
             .map { _ in return () }
     }
 
+    /// Request for authentication in a password-protected Redis server.
+    ///
+    /// https://redis.io/commands/auth
+    public func authorize(with password: String) -> EventLoopFuture<Void> {
+        return command("AUTH", [RedisData(bulk: password)]).map { _ in return () }
+    }
+
     /// Removes the specified keys. A key is ignored if it does not exist.
     ///
     /// https://redis.io/commands/del

Sources/NIORedis/NIORedis.swift

@@ -50,6 +50,13 @@ public final class NIORedis {
 
         return bootstrap.connect(host: hostname, port: port)
             .map { return NIORedisConnection(channel: $0, handler: channelHandler) }
+            .then { connection in
+                guard let pw = password else {
+                    return self.elg.next().makeSucceededFuture(result: connection)
+                }
+
+                return connection.authorize(with: pw).map { _ in return connection }
+            }
     }
 
     /// Handles the proper shutdown of managed resources.