/*
 * 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

/// Auth operations

// Login - login handler.
func (c *controllerAPIHandlers) LoginHandler(args *RPCLoginArgs, reply *RPCLoginReply) error {
	jwt, err := newJWT(defaultTokenExpiry)
	if err != nil {
		return err
	}
	if err = jwt.Authenticate(args.Username, args.Password); err != nil {
		return err
	}
	token, err := jwt.GenerateToken(args.Username)
	if err != nil {
		return err
	}
	reply.Token = token
	reply.ServerVersion = Version
	return nil
}

// HealListArgs - argument for ListObjects RPC.
type HealListArgs struct {
	// Authentication token generated by Login.
	GenericArgs

	Bucket    string
	Prefix    string
	Marker    string
	Delimiter string
	MaxKeys   int
}

// HealListReply - reply object by ListObjects RPC.
type HealListReply struct {
	IsTruncated bool
	NextMarker  string
	Objects     []string
}

// ListObjects - list all objects that needs healing.
func (c *controllerAPIHandlers) ListObjectsHealHandler(args *HealListArgs, reply *HealListReply) error {
	objAPI := c.ObjectAPI()
	if objAPI == nil {
		return errVolumeBusy
	}
	if !isRPCTokenValid(args.Token) {
		return errInvalidToken
	}
	info, err := objAPI.ListObjectsHeal(args.Bucket, args.Prefix, args.Marker, args.Delimiter, args.MaxKeys)
	if err != nil {
		return err
	}
	reply.IsTruncated = info.IsTruncated
	reply.NextMarker = info.NextMarker
	for _, obj := range info.Objects {
		reply.Objects = append(reply.Objects, obj.Name)
	}
	return nil
}

// HealObjectArgs - argument for HealObject RPC.
type HealObjectArgs struct {
	// Authentication token generated by Login.
	GenericArgs

	// Name of the bucket.
	Bucket string

	// Name of the object.
	Object string
}

// HealObjectReply - reply by HealObject RPC.
type HealObjectReply struct{}

// HealObject - heal the object.
func (c *controllerAPIHandlers) HealObjectHandler(args *HealObjectArgs, reply *GenericReply) error {
	objAPI := c.ObjectAPI()
	if objAPI == nil {
		return errVolumeBusy
	}
	if !isRPCTokenValid(args.Token) {
		return errInvalidToken
	}
	return objAPI.HealObject(args.Bucket, args.Object)
}

// HealObject - heal the object.
func (c *controllerAPIHandlers) HealDiskMetadataHandler(args *GenericArgs, reply *GenericReply) error {
	objAPI := c.ObjectAPI()
	if objAPI == nil {
		return errVolumeBusy
	}
	if !isRPCTokenValid(args.Token) {
		return errInvalidToken
	}
	err := objAPI.HealDiskMetadata()
	if err != nil {
		return err
	}
	go func() {
		globalWakeupCh <- struct{}{}
	}()
	return err
}

// ShutdownArgs - argument for Shutdown RPC.
type ShutdownArgs struct {
	// Authentication token generated by Login.
	GenericArgs

	// Should the server be restarted, call active connections are served before server
	// is restarted.
	Restart bool
}

// Shutdown - Shutsdown the server.
func (c *controllerAPIHandlers) ShutdownHandler(args *ShutdownArgs, reply *GenericReply) error {
	if !isRPCTokenValid(args.Token) {
		return errInvalidToken
	}
	if args.Restart {
		globalShutdownSignalCh <- shutdownRestart
	} else {
		globalShutdownSignalCh <- shutdownHalt
	}
	return nil
}

func (c *controllerAPIHandlers) TryInitHandler(args *GenericArgs, reply *GenericReply) error {
	go func() {
		globalWakeupCh <- struct{}{}
	}()
	*reply = GenericReply{}
	return nil

}

// LockInfo - RPC control handler for `minio control lock`.
// Returns the info of the locks held in the system.
func (c *controllerAPIHandlers) LockInfo(arg *GenericArgs, reply *SystemLockState) error {
	// obtain the lock state information.
	lockInfo, err := generateSystemLockResponse()
	// in case of error, return err to the RPC client.
	if err != nil {
		return err
	}
	// the response containing the lock info.
	*reply = lockInfo
	return nil
}