github.com/sleungcy/cli@v7.1.0+incompatible/command/flag/ssh_port_forwarding.go (about)

     1  package flag
     2  
     3  import (
     4  	"fmt"
     5  	"regexp"
     6  	"strings"
     7  
     8  	flags "github.com/jessevdk/go-flags"
     9  )
    10  
    11  const DefaultLocalAddress = "localhost"
    12  
    13  type SSHPortForwarding struct {
    14  	LocalAddress  string
    15  	RemoteAddress string
    16  }
    17  
    18  func (s *SSHPortForwarding) UnmarshalFlag(val string) error {
    19  	splitHosts := strings.Split(val, ":")
    20  	for _, piece := range splitHosts {
    21  		if len(piece) == 0 {
    22  			return &flags.Error{
    23  				Type:    flags.ErrRequired,
    24  				Message: fmt.Sprintf("Bad local forwarding specification '%s'", val),
    25  			}
    26  		}
    27  	}
    28  
    29  	re := regexp.MustCompile(`^\d+$`)
    30  	switch {
    31  	case len(splitHosts) == 3 && re.MatchString(splitHosts[0]) && re.MatchString(splitHosts[2]):
    32  		s.LocalAddress = fmt.Sprintf("%s:%s", DefaultLocalAddress, splitHosts[0])
    33  		s.RemoteAddress = fmt.Sprintf("%s:%s", splitHosts[1], splitHosts[2])
    34  	case len(splitHosts) == 4 && re.MatchString(splitHosts[1]) && re.MatchString(splitHosts[3]):
    35  		s.LocalAddress = fmt.Sprintf("%s:%s", splitHosts[0], splitHosts[1])
    36  		s.RemoteAddress = fmt.Sprintf("%s:%s", splitHosts[2], splitHosts[3])
    37  	default:
    38  		return &flags.Error{
    39  			Type:    flags.ErrRequired,
    40  			Message: fmt.Sprintf("Bad local forwarding specification '%s'", val),
    41  		}
    42  	}
    43  
    44  	return nil
    45  }