[CONJS-110] permit fast-authentication with 'mysql_clear_password' au…

…thentication plugin.

- fast-authentication plugin now permits 'client_ed25519', 'mysql_clear_password' or 'mysql_native_password'
- plugin 'mysql_native_password' is used by default if not matching.
- unexpected packet type during handshake result will throw a good error.

lib/cmd/handshake/client-handshake-response.js

@@ -22,17 +22,21 @@ module.exports.send = function send(cmd, out, opts, pluginName, info) {
   info.defaultPluginName = pluginName;
   const pwd = Array.isArray(opts.password) ? opts.password[0] : opts.password;
   let authToken;
+  let authPlugin;
   switch (pluginName) {
-    case 'mysql_native_password':
-    case '':
-      authToken = NativePasswordAuth.encryptPassword(pwd, info.seed);
-      break;
     case 'client_ed25519':
       authToken = Ed25519PasswordAuth.encryptPassword(pwd, info.seed);
+      authPlugin = 'client_ed25519';
+      break;
+
+    case 'mysql_clear_password':
+      authToken = Buffer.from(pwd);
+      authPlugin = 'mysql_clear_password';
       break;
 
     default:
-      authToken = Buffer.alloc(0);
+      authToken = NativePasswordAuth.encryptPassword(pwd, info.seed);
+      authPlugin = 'mysql_native_password';
       break;
   }
 

lib/cmd/handshake/handshake.js

@@ -107,7 +107,7 @@ class Handshake extends Command {
       //*********************************************************************************************************
       default:
         this.throwNewError(
-          'Unexpected type of packet during handshake phase : ' + packet.log(),
+          'Unexpected type of packet during handshake phase : ' + marker,
           true,
           info,
           '42000',