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mask.go
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/
mask.go
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package mask
import (
"errors"
"fmt"
"net"
"strings"
manet "github.com/ipfs/go-ipfs/Godeps/_workspace/src/github.com/jbenet/go-multiaddr-net"
)
var ErrInvalidFormat = errors.New("invalid multiaddr-filter format")
func NewMask(a string) (*net.IPNet, error) {
parts := strings.Split(a, "/")
if parts[0] != "" {
return nil, ErrInvalidFormat
}
if len(parts) != 5 {
return nil, ErrInvalidFormat
}
// check it's a valid filter address. ip + cidr
isip := parts[1] == "ip4" || parts[1] == "ip6"
iscidr := parts[3] == "ipcidr"
if !isip || !iscidr {
return nil, ErrInvalidFormat
}
_, ipn, err := net.ParseCIDR(parts[2] + "/" + parts[4])
if err != nil {
return nil, err
}
return ipn, nil
}
func ConvertIPNet(n *net.IPNet) (string, error) {
addr, err := manet.FromIP(n.IP)
if err != nil {
return "", err
}
b, _ := n.Mask.Size()
return fmt.Sprintf("%s/ipcidr/%d", addr, b), nil
}