86 lines
2.9 KiB
Go
86 lines
2.9 KiB
Go
/*
|
|
* Minio Cloud Storage, (C) 2016 Minio, Inc.
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
|
|
package cmd
|
|
|
|
import (
|
|
"net/rpc"
|
|
"time"
|
|
|
|
"github.com/minio/dsync"
|
|
)
|
|
|
|
// AuthRPCClient is a wrapper type for RPCClient which provides JWT based authentication across reconnects.
|
|
type AuthRPCClient struct {
|
|
rpc *RPCClient // reconnect'able rpc client built on top of net/rpc Client
|
|
cred credential // AccessKey and SecretKey
|
|
token string // JWT based token
|
|
tstamp time.Time // Timestamp as received on Login RPC.
|
|
loginMethod string // RPC service name for authenticating using JWT
|
|
}
|
|
|
|
// newAuthClient - returns a jwt based authenticated (go) rpc client, which does automatic reconnect.
|
|
func newAuthClient(node, rpcPath string, cred credential, loginMethod string) *AuthRPCClient {
|
|
return &AuthRPCClient{
|
|
rpc: newClient(node, rpcPath),
|
|
cred: cred,
|
|
loginMethod: loginMethod,
|
|
}
|
|
}
|
|
|
|
// Close - closes underlying rpc connection.
|
|
func (authClient *AuthRPCClient) Close() error {
|
|
// reset token on closing a connection
|
|
authClient.token = ""
|
|
return authClient.rpc.Close()
|
|
}
|
|
|
|
// Login - a jwt based authentication is performed with rpc server.
|
|
func (authClient *AuthRPCClient) Login() (string, time.Time, error) {
|
|
reply := RPCLoginReply{}
|
|
if err := authClient.rpc.Call(authClient.loginMethod, RPCLoginArgs{
|
|
Username: authClient.cred.AccessKeyID,
|
|
Password: authClient.cred.SecretAccessKey,
|
|
}, &reply); err != nil {
|
|
return "", time.Time{}, err
|
|
}
|
|
return reply.Token, reply.Timestamp, nil
|
|
}
|
|
|
|
// Call - If rpc connection isn't established yet since previous disconnect,
|
|
// connection is established, a jwt authenticated login is performed and then
|
|
// the call is performed.
|
|
func (authClient *AuthRPCClient) Call(serviceMethod string, args dsync.TokenSetter, reply interface{}) error {
|
|
if authClient.token == "" {
|
|
token, tstamp, err := authClient.Login()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
// set token, time stamp as received from a successful login call.
|
|
authClient.token = token
|
|
authClient.tstamp = tstamp
|
|
// Update the RPC call's token with that received from the recent login call.
|
|
args.SetToken(token)
|
|
args.SetTimestamp(tstamp)
|
|
}
|
|
err := authClient.rpc.Call(serviceMethod, args, reply)
|
|
// Reset token on disconnect to mark for re-login on subsequent reconnect.
|
|
if err != nil && err == rpc.ErrShutdown {
|
|
authClient.token = ""
|
|
}
|
|
return err
|
|
}
|