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addr.go
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addr.go
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package flagtypes
import (
"fmt"
"net"
"net/url"
"strconv"
"strings"
)
// urlPrefixes is the list of string prefix values that may indicate a URL
// is present.
var urlPrefixes = []string{"http://", "https://", "tcp://"}
// Addr is a flag type that attempts to load a host, IP, host:port, or
// URL value from a string argument. It tracks whether the value was set
// and allows the caller to provide defaults for the scheme and port.
type Addr struct {
// Specified by the caller
DefaultScheme string
DefaultPort int
AllowPrefix bool
// Provided will be true if Set is invoked
Provided bool
// Value is the exact value provided on the flag
Value string
// URL represents the user input. The Host field is guaranteed
// to be set if Provided is true
URL *url.URL
// Host is the hostname or IP portion of the user input
Host string
// IPv6Host is true if the hostname appears to be an IPv6 input
IPv6Host bool
// Port is the port portion of the user input. Will be 0 if no port was found
// and no default port could be established.
Port int
}
// Default creates a new Address with the value set
func (a Addr) Default() Addr {
if err := a.Set(a.Value); err != nil {
panic(err)
}
a.Provided = false
return a
}
// String returns the string representation of the Addr
func (a *Addr) String() string {
if a.URL == nil {
return a.Value
}
return a.URL.String()
}
// Set attempts to set a string value to an address
func (a *Addr) Set(value string) error {
scheme := a.DefaultScheme
if len(scheme) == 0 {
scheme = "tcp"
}
addr := &url.URL{
Scheme: scheme,
}
switch {
case a.isURL(value):
parsed, err := url.Parse(value)
if err != nil {
return fmt.Errorf("not a valid URL: %v", err)
}
if !a.AllowPrefix {
parsed.Path = ""
}
parsed.RawQuery = ""
parsed.Fragment = ""
if strings.Contains(parsed.Host, ":") {
host, port, err := net.SplitHostPort(parsed.Host)
if err != nil {
return fmt.Errorf("not a valid host:port: %v", err)
}
portNum, err := strconv.ParseUint(port, 10, 64)
if err != nil {
return fmt.Errorf("not a valid port: %v", err)
}
a.Host = host
a.Port = int(portNum)
} else {
port := 0
switch parsed.Scheme {
case "http":
port = 80
case "https":
port = 443
default:
return fmt.Errorf("no port specified")
}
a.Host = parsed.Host
a.Port = port
}
addr = parsed
case isIPv6Host(value):
a.Host = value
a.Port = a.DefaultPort
case strings.Contains(value, ":"):
host, port, err := net.SplitHostPort(value)
if err != nil {
return fmt.Errorf("not a valid host:port: %v", err)
}
portNum, err := strconv.ParseUint(port, 10, 64)
if err != nil {
return fmt.Errorf("not a valid port: %v", err)
}
a.Host = host
a.Port = int(portNum)
default:
port := a.DefaultPort
if port == 0 {
switch a.DefaultScheme {
case "http":
port = 80
case "https":
port = 443
default:
return fmt.Errorf("no port specified")
}
}
a.Host = value
a.Port = port
}
addr.Host = net.JoinHostPort(a.Host, strconv.FormatInt(int64(a.Port), 10))
if value != a.Value {
a.Provided = true
}
a.URL = addr
a.IPv6Host = isIPv6Host(a.Host)
a.Value = value
return nil
}
// Type returns a string representation of what kind of value this is
func (a *Addr) Type() string {
return "string"
}
// isURL returns true if the provided value appears to be a valid URL.
func (a *Addr) isURL(value string) bool {
prefixes := urlPrefixes
if a.DefaultScheme != "" {
prefixes = append(prefixes, fmt.Sprintf("%s://", a.DefaultScheme))
}
for _, p := range prefixes {
if strings.HasPrefix(value, p) {
return true
}
}
return false
}
// isIPv6Host returns true if the value appears to be an IPv6 host string (that does
// not include a port).
func isIPv6Host(value string) bool {
if strings.HasPrefix(value, "[") {
return false
}
return strings.Contains(value, "%") || strings.Count(value, ":") > 1
}