allow empty password in client.yml

fixes #374

client/config.go

@@ -14,12 +14,12 @@ const (
 type Config struct {
 	DefaultHost     string  `yaml:"default-host"`
 	DefaultUser     string  `yaml:"default-user"`
-	DefaultPassword string `yaml:"default-password"`
+	DefaultPassword *string `yaml:"default-password"`
 	DefaultCommand  string  `yaml:"default-command"`
 	Subscribe       []struct {
 		Topic    string            `yaml:"topic"`
 		User     string            `yaml:"user"`
-		Password string            `yaml:"password"`
+		Password *string           `yaml:"password"`
 		Command  string            `yaml:"command"`
 		If       map[string]string `yaml:"if"`
 	} `yaml:"subscribe"`
@@ -30,7 +30,7 @@ func NewConfig() *Config {
 	return &Config{
 		DefaultHost:     DefaultBaseURL,
 		DefaultUser:     "",
-		DefaultPassword: "",
+		DefaultPassword: nil,
 		DefaultCommand:  "",
 		Subscribe:       nil,
 	}

client/config_test.go

@@ -12,7 +12,7 @@ func TestConfig_Load(t *testing.T) {
 	filename := filepath.Join(t.TempDir(), "client.yml")
 	require.Nil(t, os.WriteFile(filename, []byte(`
 default-host: http://localhost
-default-user: phil
+default-user: philipp
 default-password: mypass
 default-command: 'echo "Got the message: $message"'
 subscribe:
@@ -31,14 +31,14 @@ subscribe:
 	conf, err := client.LoadConfig(filename)
 	require.Nil(t, err)
 	require.Equal(t, "http://localhost", conf.DefaultHost)
-	require.Equal(t, "phil", conf.DefaultUser)
-	require.Equal(t, "mypass", conf.DefaultPassword)
+	require.Equal(t, "philipp", conf.DefaultUser)
+	require.Equal(t, "mypass", *conf.DefaultPassword)
 	require.Equal(t, `echo "Got the message: $message"`, conf.DefaultCommand)
 	require.Equal(t, 4, len(conf.Subscribe))
 	require.Equal(t, "no-command-with-auth", conf.Subscribe[0].Topic)
 	require.Equal(t, "", conf.Subscribe[0].Command)
 	require.Equal(t, "phil", conf.Subscribe[0].User)
-	require.Equal(t, "mypass", conf.Subscribe[0].Password)
+	require.Equal(t, "mypass", *conf.Subscribe[0].Password)
 	require.Equal(t, "echo-this", conf.Subscribe[1].Topic)
 	require.Equal(t, `echo "Message received: $message"`, conf.Subscribe[1].Command)
 	require.Equal(t, "alerts", conf.Subscribe[2].Topic)
@@ -46,3 +46,73 @@ subscribe:
 	require.Equal(t, "high,urgent", conf.Subscribe[2].If["priority"])
 	require.Equal(t, "defaults", conf.Subscribe[3].Topic)
 }
+
+func TestConfig_EmptyPassword(t *testing.T) {
+	filename := filepath.Join(t.TempDir(), "client.yml")
+	require.Nil(t, os.WriteFile(filename, []byte(`
+default-host: http://localhost
+default-user: philipp
+default-password: ""
+subscribe:
+  - topic: no-command-with-auth
+    user: phil
+    password: ""
+`), 0600))
+
+	conf, err := client.LoadConfig(filename)
+	require.Nil(t, err)
+	require.Equal(t, "http://localhost", conf.DefaultHost)
+	require.Equal(t, "philipp", conf.DefaultUser)
+	require.Equal(t, "", *conf.DefaultPassword)
+	require.Equal(t, 1, len(conf.Subscribe))
+	require.Equal(t, "no-command-with-auth", conf.Subscribe[0].Topic)
+	require.Equal(t, "", conf.Subscribe[0].Command)
+	require.Equal(t, "phil", conf.Subscribe[0].User)
+	require.Equal(t, "", *conf.Subscribe[0].Password)
+}
+
+func TestConfig_NullPassword(t *testing.T) {
+	filename := filepath.Join(t.TempDir(), "client.yml")
+	require.Nil(t, os.WriteFile(filename, []byte(`
+default-host: http://localhost
+default-user: philipp
+default-password: ~
+subscribe:
+  - topic: no-command-with-auth
+    user: phil
+    password: ~
+`), 0600))
+
+	conf, err := client.LoadConfig(filename)
+	require.Nil(t, err)
+	require.Equal(t, "http://localhost", conf.DefaultHost)
+	require.Equal(t, "philipp", conf.DefaultUser)
+	require.Nil(t, conf.DefaultPassword)
+	require.Equal(t, 1, len(conf.Subscribe))
+	require.Equal(t, "no-command-with-auth", conf.Subscribe[0].Topic)
+	require.Equal(t, "", conf.Subscribe[0].Command)
+	require.Equal(t, "phil", conf.Subscribe[0].User)
+	require.Nil(t, conf.Subscribe[0].Password)
+}
+
+func TestConfig_NoPassword(t *testing.T) {
+	filename := filepath.Join(t.TempDir(), "client.yml")
+	require.Nil(t, os.WriteFile(filename, []byte(`
+default-host: http://localhost
+default-user: philipp
+subscribe:
+  - topic: no-command-with-auth
+    user: phil
+`), 0600))
+
+	conf, err := client.LoadConfig(filename)
+	require.Nil(t, err)
+	require.Equal(t, "http://localhost", conf.DefaultHost)
+	require.Equal(t, "philipp", conf.DefaultUser)
+	require.Nil(t, conf.DefaultPassword)
+	require.Equal(t, 1, len(conf.Subscribe))
+	require.Equal(t, "no-command-with-auth", conf.Subscribe[0].Topic)
+	require.Equal(t, "", conf.Subscribe[0].Command)
+	require.Equal(t, "phil", conf.Subscribe[0].User)
+	require.Nil(t, conf.Subscribe[0].Password)
+}

cmd/subscribe.go

@@ -175,19 +175,20 @@ func doSubscribe(c *cli.Context, cl *client.Client, conf *client.Config, topic,
 		for filter, value := range s.If {
 			topicOptions = append(topicOptions, client.WithFilter(filter, value))
 		}
-		var user, password string
+		var user string
+		var password *string
 		if s.User != "" {
 			user = s.User
 		} else if conf.DefaultUser != "" {
 			user = conf.DefaultUser
 		}
-		if s.Password != "" {
+		if s.Password != nil {
 			password = s.Password
-		} else if conf.DefaultPassword != "" {
+		} else if conf.DefaultPassword != nil {
 			password = conf.DefaultPassword
 		}
-		if user != "" && password != "" {
-			topicOptions = append(topicOptions, client.WithBasicAuth(user, password))
+		if user != "" && password != nil {
+			topicOptions = append(topicOptions, client.WithBasicAuth(user, *password))
 		}
 		subscriptionID := cl.Subscribe(s.Topic, topicOptions...)
 		if s.Command != "" {