Add support for URL SANs (#166)

cert.go

@@ -20,6 +20,7 @@ import (
 	"math/big"
 	"net"
 	"net/mail"
+	"net/url"
 	"os"
 	"os/user"
 	"path/filepath"
@@ -74,6 +75,8 @@ func (m *mkcert) makeCert(hosts []string) {
 			tpl.IPAddresses = append(tpl.IPAddresses, ip)
 		} else if email, err := mail.ParseAddress(h); err == nil && email.Address == h {
 			tpl.EmailAddresses = append(tpl.EmailAddresses, h)
+		} else if uriName, err := url.Parse(h); err == nil && uriName.Scheme != "" && uriName.Host != "" {
+			tpl.URIs = append(tpl.URIs, uriName)
 		} else {
 			tpl.DNSNames = append(tpl.DNSNames, h)
 		}

main.go

@@ -13,6 +13,7 @@ import (
 	"log"
 	"net"
 	"net/mail"
+	"net/url"
 	"os"
 	"os/exec"
 	"path/filepath"
@@ -195,13 +196,16 @@ func (m *mkcert) Run(args []string) {
 		if email, err := mail.ParseAddress(name); err == nil && email.Address == name {
 			continue
 		}
+		if uriName, err := url.Parse(name); err == nil && uriName.Scheme != "" && uriName.Host != "" {
+			continue
+		}
 		punycode, err := idna.ToASCII(name)
 		if err != nil {
-			log.Fatalf("ERROR: %q is not a valid hostname, IP, or email: %s", name, err)
+			log.Fatalf("ERROR: %q is not a valid hostname, IP, URL or email: %s", name, err)
 		}
 		args[i] = punycode
 		if !hostnameRegexp.MatchString(punycode) {
-			log.Fatalf("ERROR: %q is not a valid hostname, IP, or email", name)
+			log.Fatalf("ERROR: %q is not a valid hostname, IP, URL or email", name)
 		}
 	}