tesla-control: enable/disable valet mode

Adds valet mode commands to the tesla-control CLI tool. These commands
were already supported in the library and HTTP proxy.

cmd/tesla-control/commands.go

@@ -243,6 +243,25 @@ func (c *Command) Usage(name string) {
 }
 
 var commands = map[string]*Command{
+	"valet-mode-on": &Command{
+		help:             "Enable valet mode",
+		requiresAuth:     true,
+		requiresFleetAPI: false,
+		args: []Argument{
+			Argument{name: "PIN", help: "Valet mode PIN"},
+		},
+		handler: func(ctx context.Context, acct *account.Account, car *vehicle.Vehicle, args map[string]string) error {
+			return car.EnableValetMode(ctx, args["PIN"])
+		},
+	},
+	"valet-mode-off": &Command{
+		help:             "Disable valet mode",
+		requiresAuth:     true,
+		requiresFleetAPI: false,
+		handler: func(ctx context.Context, acct *account.Account, car *vehicle.Vehicle, args map[string]string) error {
+			return car.DisableValetMode(ctx)
+		},
+	},
 	"unlock": &Command{
 		help:             "Unlock vehicle",
 		requiresAuth:     true,

pkg/vehicle/security.go

@@ -3,6 +3,8 @@ package vehicle
 import (
 	"context"
 	"crypto/ecdh"
+	"errors"
+	"strings"
 
 	"google.golang.org/protobuf/proto"
 
@@ -13,8 +15,41 @@ import (
 	"github.com/teslamotors/vehicle-command/pkg/protocol/protobuf/vcsec"
 )
 
+// IsValidPIN returns true if the pin is four digits.
+func IsValidPIN(pin string) bool {
+	if len(pin) != 4 {
+		return false
+	}
+	for _, c := range pin {
+		if c < '0' || c > '9' {
+			return false
+		}
+	}
+	return true
+}
+
+var ErrInvalidPIN = errors.New("PIN codes must be four digits")
+
+// EnableValetMode enters the vehicle's Valet Mode. This sets certain restrictions but disables PIN
+// to Drive. Consult the Owner's Manual for details. The PIN must be a four-digit string.
+func (v *Vehicle) EnableValetMode(ctx context.Context, pin string) error {
+	return v.SetValetMode(ctx, true, pin)
+}
+
+// DisableValetMode exits Valet Mode.
+func (v *Vehicle) DisableValetMode(ctx context.Context) error {
+	return v.SetValetMode(ctx, false, "")
+}
+
+// SetValetMode enables or disables Valet Mode. A password must be provided when turning valet mode
+// on, and should be empty when turning valet mode off.
+//
+// Deprecated: Use EnableValetMode or DisableValetMode.
 func (v *Vehicle) SetValetMode(ctx context.Context, on bool, valetPassword string) error {
-	return v.executeCarServerAction(ctx,
+	if on && !IsValidPIN(valetPassword) {
+		return ErrInvalidPIN
+	}
+	err := v.executeCarServerAction(ctx,
 		&carserver.Action_VehicleAction{
 			VehicleAction: &carserver.VehicleAction{
 				VehicleActionMsg: &carserver.VehicleAction_VehicleControlSetValetModeAction{
@@ -25,6 +60,10 @@ func (v *Vehicle) SetValetMode(ctx context.Context, on bool, valetPassword strin
 				},
 			},
 		})
+	if !on && err != nil && strings.HasSuffix(err.Error(), "already off") {
+		return nil
+	}
+	return err
 }
 
 func (v *Vehicle) ResetValetPin(ctx context.Context) error {