implementation on client side as well, complete with tests

Signed-off-by: avaid96 <avaid1996@gmail.com>

client/client.go

@@ -55,11 +55,10 @@ func Get(program ProgramFunc, serverURL string) (*credentials.Credentials, error
 	return resp, nil
 }
 
-// Erase executes a program to remove the server credentails from the native store.
+// Erase executes a program to remove the server credentials from the native store.
 func Erase(program ProgramFunc, serverURL string) error {
 	cmd := program("erase")
 	cmd.Input(strings.NewReader(serverURL))
-
 	out, err := cmd.Output()
 	if err != nil {
 		t := strings.TrimSpace(string(out))
@@ -68,3 +67,15 @@ func Erase(program ProgramFunc, serverURL string) error {
 
 	return nil
 }
+
+// List executes a program to remove the server credentials from the native store.
+func List(program ProgramFunc) error {
+	cmd := program("list")
+	cmd.Input(strings.NewReader("garbage"))
+	out, err := cmd.Output()
+	if err != nil {
+		t := strings.TrimSpace(string(out))
+		return fmt.Errorf("error listing credentials - err: %v, out: `%s`", err, t)
+	}
+	return nil
+}

client/client_test.go

@@ -70,6 +70,9 @@ func (m *mockProgram) Output() ([]byte, error) {
 		default:
 			return []byte("error storing credentials"), errProgramExited
 		}
+	case "list":
+		return []byte(`{"Path":"e237574ae22fd53ddb9490dc1f72139946fd5372d42ba54d1eeb3ae5068fd22b","Username":"http://example.com/collections\u003cnotary_key\u003eSnapshot"}`), nil
+
 	}
 
 	return []byte(fmt.Sprintf("unknown argument %q with %q", m.arg, inS)), errProgramExited
@@ -190,3 +193,9 @@ func TestErase(t *testing.T) {
 		t.Fatalf("Expected error for server %s, got nil", invalidServerAddress)
 	}
 }
+
+func TestList(t *testing.T) {
+	if err := List(mockProgramFn); err != nil {
+		t.Fatal(err)
+	}
+}

credentials/credentials.go

@@ -30,7 +30,7 @@ type KeyData struct {
 func Serve(helper Helper) {
 	var err error
 	if len(os.Args) != 2 {
-		err = fmt.Errorf("Usage: %s <store|get|erase>", os.Args[0])
+		err = fmt.Errorf("Usage: %s <store|get|erase|list>", os.Args[0])
 	}
 
 	if err == nil {
@@ -52,6 +52,8 @@ func HandleCommand(helper Helper, key string, in io.Reader, out io.Writer) error
 		return Get(helper, in, out)
 	case "erase":
 		return Erase(helper, in)
+	case "list":
+		return List(helper, out)
 	}
 	return fmt.Errorf("Unknown credential action `%s`", key)
 }