Revert "validate network and endpoint name more strictly"

This reverts commit 1807951d7f.

Signed-off-by: Madhu Venugopal <madhu@docker.com>

config/config.go

@@ -1,8 +1,6 @@
 package config
 
 import (
-	"fmt"
-	"regexp"
 	"strings"
 
 	"github.com/BurntSushi/toml"
@@ -17,12 +15,6 @@ import (
 	"github.com/docker/libnetwork/osl"
 )
 
-// RestrictedNameChars collects the characters allowed to represent a network or endpoint name.
-const restrictedNameChars = `[a-zA-Z0-9][a-zA-Z0-9_.-]`
-
-// RestrictedNamePattern is a regular expression to validate names against the collection of restricted characters.
-var restrictedNamePattern = regexp.MustCompile(`^/?` + restrictedNameChars + `+$`)
-
 // Config encapsulates configurations of various Libnetwork components
 type Config struct {
 	Daemon          DaemonCfg
@@ -240,12 +232,12 @@ func (c *Config) ProcessOptions(options ...Option) {
 	}
 }
 
-// ValidateName validates configuration objects supported by libnetwork
-func ValidateName(name string) error {
-	if !restrictedNamePattern.MatchString(name) {
-		return fmt.Errorf("%s includes invalid characters, only %q are allowed", name, restrictedNameChars)
+// IsValidName validates configuration objects supported by libnetwork
+func IsValidName(name string) bool {
+	if strings.TrimSpace(name) == "" {
+		return false
 	}
-	return nil
+	return true
 }
 
 // OptionLocalKVProvider function returns an option setter for kvstore provider

config/config_test.go

@@ -46,16 +46,13 @@ func TestOptionsLabels(t *testing.T) {
 }
 
 func TestValidName(t *testing.T) {
-	if err := ValidateName("test"); err != nil {
+	if !IsValidName("test") {
 		t.Fatal("Name validation fails for a name that must be accepted")
 	}
-	if err := ValidateName(""); err == nil {
+	if IsValidName("") {
 		t.Fatal("Name validation succeeds for a case when it is expected to fail")
 	}
-	if err := ValidateName("   "); err == nil {
-		t.Fatal("Name validation succeeds for a case when it is expected to fail")
-	}
-	if err := ValidateName("<>$$^"); err == nil {
+	if IsValidName("   ") {
 		t.Fatal("Name validation succeeds for a case when it is expected to fail")
 	}
 }

controller.go

@@ -647,8 +647,8 @@ func (c *controller) NewNetwork(networkType, name string, id string, options ...
 		}
 	}
 
-	if err := config.ValidateName(name); err != nil {
-		return nil, ErrInvalidName(err.Error())
+	if !config.IsValidName(name) {
+		return nil, ErrInvalidName(name)
 	}
 
 	if id == "" {

error.go

@@ -69,7 +69,7 @@ func (ii ErrInvalidID) Error() string {
 func (ii ErrInvalidID) BadRequest() {}
 
 // ErrInvalidName is returned when a query-by-name or resource create method is
-// invoked with an invalid name parameter
+// invoked with an empty name parameter
 type ErrInvalidName string
 
 func (in ErrInvalidName) Error() string {

network.go

@@ -879,9 +879,8 @@ func (n *network) addEndpoint(ep *endpoint) error {
 
 func (n *network) CreateEndpoint(name string, options ...EndpointOption) (Endpoint, error) {
 	var err error
-
-	if err = config.ValidateName(name); err != nil {
-		return nil, ErrInvalidName(err.Error())
+	if !config.IsValidName(name) {
+		return nil, ErrInvalidName(name)
 	}
 
 	if _, err = n.EndpointByName(name); err == nil {