Publish helper structs and methods.

Signed-off-by: David Calavera <david.calavera@gmail.com>

osxkeychain/cmd/main_darwin.go

@@ -6,5 +6,5 @@ import (
 )
 
 func main() {
-	credentials.Serve(osxkeychain.New())
+	credentials.Serve(osxkeychain.Osxkeychain{})
 }

osxkeychain/osxkeychain_darwin.go

@@ -22,15 +22,11 @@ import (
 // when the credentials are not in the keychain.
 const errCredentialsNotFound = "The specified item could not be found in the keychain."
 
-type osxkeychain struct{}
-
-// New creates a new osxkeychain.
-func New() credentials.Helper {
-	return osxkeychain{}
-}
+// Osxkeychain handles secrets using the OS X Keychain as store.
+type Osxkeychain struct{}
 
 // Add adds new credentials to the keychain.
-func (h osxkeychain) Add(creds *credentials.Credentials) error {
+func (h Osxkeychain) Add(creds *credentials.Credentials) error {
 	s, err := splitServer(creds.ServerURL)
 	if err != nil {
 		return err
@@ -52,7 +48,7 @@ func (h osxkeychain) Add(creds *credentials.Credentials) error {
 }
 
 // Delete removes credentials from the keychain.
-func (h osxkeychain) Delete(serverURL string) error {
+func (h Osxkeychain) Delete(serverURL string) error {
 	s, err := splitServer(serverURL)
 	if err != nil {
 		return err
@@ -69,7 +65,7 @@ func (h osxkeychain) Delete(serverURL string) error {
 }
 
 // Get returns the username and secret to use for a given registry server URL.
-func (h osxkeychain) Get(serverURL string) (string, string, error) {
+func (h Osxkeychain) Get(serverURL string) (string, string, error) {
 	s, err := splitServer(serverURL)
 	if err != nil {
 		return "", "", err

osxkeychain/osxkeychain_darwin_test.go

@@ -13,7 +13,7 @@ func TestOSXKeychainHelper(t *testing.T) {
 		Secret:    "foobarbaz",
 	}
 
-	helper := New()
+	helper := Osxkeychain{}
 	if err := helper.Add(creds); err != nil {
 		t.Fatal(err)
 	}
@@ -37,7 +37,7 @@ func TestOSXKeychainHelper(t *testing.T) {
 }
 
 func TestMissingCredentials(t *testing.T) {
-	helper := New()
+	helper := Osxkeychain{}
 	_, _, err := helper.Get("https://adsfasdf.wrewerwer.com/asdfsdddd")
 	if err != credentials.ErrCredentialsNotFound {
 		t.Fatalf("exptected ErrCredentialsNotFound, got %v", err)