Implement allowPublicKeyRetrieval option in mysql datasource

src/main/java/fr/xephi/authme/datasource/MySQL.java

@@ -39,6 +39,7 @@ public class MySQL extends AbstractSqlDataSource {
 
     private boolean useSsl;
     private boolean serverCertificateVerification;
+    private boolean allowPublicKeyRetrieval;
     private String host;
     private String port;
     private String username;
@@ -118,6 +119,7 @@ public class MySQL extends AbstractSqlDataSource {
         this.maxLifetime = settings.getProperty(DatabaseSettings.MYSQL_CONNECTION_MAX_LIFETIME);
         this.useSsl = settings.getProperty(DatabaseSettings.MYSQL_USE_SSL);
         this.serverCertificateVerification = settings.getProperty(DatabaseSettings.MYSQL_CHECK_SERVER_CERTIFICATE);
+        this.allowPublicKeyRetrieval = settings.getProperty(DatabaseSettings.MYSQL_ALLOW_PUBLIC_KEY_RETRIEVAL);
     }
 
     /**
@@ -147,6 +149,9 @@ public class MySQL extends AbstractSqlDataSource {
         // Disabling server certificate verification on need
         if (!serverCertificateVerification) {
             ds.addDataSourceProperty("verifyServerCertificate", String.valueOf(false));
+        }        // Disabling server certificate verification on need
+        if (allowPublicKeyRetrieval) {
+            ds.addDataSourceProperty("allowPublicKeyRetrieval", String.valueOf(true));
         }
 
         // Encoding