68 lines
1.3 KiB
Go
68 lines
1.3 KiB
Go
package util
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import (
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"fmt"
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"net"
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"net/url"
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"strings"
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)
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// DefaultPort appends given port to connection if not specified
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func DefaultPort(conn string, port int) string {
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if _, _, err := net.SplitHostPort(conn); err != nil {
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conn = fmt.Sprintf("%s:%d", conn, port)
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}
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return conn
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}
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// DefaultScheme prepends given scheme to uri if not specified
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func DefaultScheme(uri string, scheme string) string {
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u, err := url.Parse(uri)
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if err != nil {
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if strings.HasSuffix(err.Error(), "first path segment in URL cannot contain colon") {
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return fmt.Sprintf("%s://%s", scheme, uri)
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}
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return uri
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}
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switch {
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case u.Scheme == "":
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// scheme missing
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u.Scheme = scheme
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case u.Opaque != "":
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// host:port format is parsed as scheme:opaque (https://golang.org/pkg/net/url/#URL)
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if u, err = url.Parse(fmt.Sprintf("%s://%s", scheme, uri)); err != nil {
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return uri
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}
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}
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return u.String()
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}
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// LocalIPs returns a slice of local IPv4 addresses
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func LocalIPs() (ips []net.IPNet) {
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ifaces, err := net.Interfaces()
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if err != nil {
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panic(err)
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}
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for _, i := range ifaces {
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addrs, err := i.Addrs()
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if err != nil {
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panic(err)
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}
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for _, addr := range addrs {
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// fmt.Println(addr)
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if ip, ok := addr.(*net.IPNet); ok {
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if !ip.IP.IsLoopback() && ip.IP.To4() != nil {
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ips = append(ips, *ip)
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}
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}
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}
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}
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return ips
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}
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