remove regex hostname parsing (#67)

Drop regex validation for postgres hostname, because it was breaking when running in a docker-compose stack where hostnames can be just one word.

If necessary this can be added in again later, but it probably won't be necessary because it doesn't actually add anything useful!

internal/db/pg/pg.go

@@ -26,7 +26,6 @@ import (
 	"fmt"
 	"net"
 	"net/mail"
-	"regexp"
 	"strings"
 	"time"
 
@@ -48,7 +47,6 @@ type postgresService struct {
 	conn   *pg.DB
 	log    *logrus.Logger
 	cancel context.CancelFunc
-	// federationDB pub.Database
 }
 
 // NewPostgresService returns a postgresService derived from the provided config, which implements the go-fed DB interface.
@@ -120,12 +118,6 @@ func derivePGOptions(c *config.Config) (*pg.Options, error) {
 		return nil, errors.New("no address set")
 	}
 
-	ipv4Regex := regexp.MustCompile(`^(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$`)
-	hostnameRegex := regexp.MustCompile(`^(?:[a-z0-9]+(?:-[a-z0-9]+)*\.)+[a-z]{2,}$`)
-	if !hostnameRegex.MatchString(c.DBConfig.Address) && !ipv4Regex.MatchString(c.DBConfig.Address) && c.DBConfig.Address != "localhost" {
-		return nil, fmt.Errorf("address %s was neither an ipv4 address nor a valid hostname", c.DBConfig.Address)
-	}
-
 	// validate username
 	if c.DBConfig.User == "" {
 		return nil, errors.New("no user set")