t.Errorf("ParsePort(127.0.0.1) => Got %d, want 0", port)
	}
	if port := model.ParsePort("[::1]:3000"); port != 3000 {
		t.Errorf("ParsePort([::1]:3000) => Got %d, want 3000", port)
	}
	if port := model.ParsePort("::1"); port != 0 {
		t.Errorf("ParsePort(::1) => Got %d, want 0", port)
	}
	if port := model.ParsePort("[2001:4860:0:2001::68]:3000"); port != 3000 {

}

// ParsePort parses a string representing a TCP port.
// If the string is not a valid representation of a TCP port, ParsePort returns an error.
func ParsePort(port string) (int, error) {
	portInt, err := netutils.ParsePort(port, true)
	if err == nil && (1 <= portInt && portInt <= 65535) {
		return portInt, nil
	}

    // Verify that no port was specified, and strip optional brackets from
    // IPv6 literals.
    HostAndPort parsedHost = HostAndPort.fromString(specifier);
    Preconditions.checkArgument(!parsedHost.hasPort());
    String host = parsedHost.getHost();

    // Try to interpret the specifier as an IP address. Note we build
    // the address rather than using the .is* methods because we want to

  public static HostAndPort fromParts(String host, int port) {
    checkArgument(isValidPort(port), "Port out of range: %s", port);
    HostAndPort parsedHost = fromString(host);
    checkArgument(!parsedHost.hasPort(), "Host has a port: %s", host);
    return new HostAndPort(parsedHost.host, port, parsedHost.hasBracketlessColons);
  }

  /**
   * Build a HostAndPort instance from a host only.
   *

}

func TestParsePort(t *testing.T) {
	// The following test cases are cribbed from the strconv
	for _, tt := range parsePortTests {
		if port, needsLookup := parsePort(tt.service); port != tt.port || needsLookup != tt.needsLookup {
			t.Errorf("parsePort(%q) = %d, %t; want %d, %t", tt.service, port, needsLookup, tt.port, tt.needsLookup)
		}
	}

// Copyright 2016 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package net

// parsePort parses service as a decimal integer and returns the
// corresponding value as port. It is the caller's responsibility to
// parse service as a non-decimal integer when needsLookup is true.
//
// Some system resolvers will return a valid port number when given a number

	return validatePortList("excludeOutboundPorts", ports)
}

// validateStatusPort validates the statusPort parameter
func validateStatusPort(port string) error {
	if _, e := parsePort(port); e != nil {
		return fmt.Errorf("excludeInboundPorts invalid: %v", e)
	}
	return nil
}

// validateUInt32 validates that the given annotation value is a positive integer.

    // Verify that no port was specified, and strip optional brackets from
    // IPv6 literals.
    HostAndPort parsedHost = HostAndPort.fromString(specifier);
    Preconditions.checkArgument(!parsedHost.hasPort());
    String host = parsedHost.getHost();

    // Try to interpret the specifier as an IP address. Note we build
    // the address rather than using the .is* methods because we want to

}

func buildExtAuthzHTTP(push *model.PushContext,
	config *meshconfig.MeshConfig_ExtensionProvider_EnvoyExternalAuthorizationHttpProvider,
) (*builtExtAuthz, error) {
	var errs error
	port, err := parsePort(config.Port)
	if err != nil {
		errs = multierror.Append(errs, err)
	}
	hostname, cluster, err := model.LookupCluster(push, config.Service, port)
	if err != nil {
		model.IncLookupClusterFailures("authz")

var localIP4 = mustGetLocalIP4()

// mustSplitHostPort is a wrapper to net.SplitHostPort() where error is assumed to be a fatal.
func mustSplitHostPort(hostPort string) (host, port string) {
	xh, err := xnet.ParseHost(hostPort)
	if err != nil {
		logger.FatalIf(err, "Unable to split host port %s", hostPort)
	}
	return xh.Name, xh.Port.String()
}

// mustGetLocalIPs returns IPs of local interface