refactor: forbid empty listeners

2 files changed, 42 insertions, 2 deletions

diff --git a/internal/config/validate.go b/internal/config/validate.go
index 3039d00a..1b5775af 100644
--- a/internal/config/validate.go
+++ b/internal/config/validate.go
@@ -2,6 +2,7 @@ package config
 
 import (
 	"errors"
+	"fmt"
 	"net/url"
 
 	"github.com/hashicorp/go-multierror"
@@ -18,6 +19,7 @@ var (
 	errAuthNoRedirect                   = errors.New("auth-redirect-uri must be defined if authentication is supported")
 	errArtifactsServerUnsupportedScheme = errors.New("artifacts-server scheme must be either http:// or https://")
 	errArtifactsServerInvalidTimeout    = errors.New("artifacts-server-timeout must be greater than or equal to 1")
+	errEmptyListener                    = errors.New("listener must not be empty")
 )
 
 // Validate values populated in Config
@@ -42,7 +44,29 @@ func validateListeners(config *Config) error {
 		return errNoListener
 	}
 
-	return nil
+	var result *multierror.Error
+	for i, s := range config.ListenHTTPStrings.Split() {
+		if s == "" {
+			result = multierror.Append(result, fmt.Errorf("empty http listener at index %d: %w", i, errEmptyListener))
+		}
+	}
+	for i, s := range config.ListenHTTPSStrings.Split() {
+		if s == "" {
+			result = multierror.Append(result, fmt.Errorf("empty https listener at index %d: %w", i, errEmptyListener))
+		}
+	}
+	for i, s := range config.ListenHTTPSProxyv2Strings.Split() {
+		if s == "" {
+			result = multierror.Append(result, fmt.Errorf("empty proxyv2 listener at index %d: %w", i, errEmptyListener))
+		}
+	}
+	for i, s := range config.ListenProxyStrings.Split() {
+		if s == "" {
+			result = multierror.Append(result, fmt.Errorf("empty proxy listener at index %d: %w", i, errEmptyListener))
+		}
+	}
+
+	return result.ErrorOrNil()
 }
 
 func validateAuthConfig(config *Config) error {
diff --git a/internal/config/validate_test.go b/internal/config/validate_test.go
index 87eb26b3..60e37732 100644
--- a/internal/config/validate_test.go
+++ b/internal/config/validate_test.go
@@ -61,6 +61,11 @@ func TestConfigValidate(t *testing.T) {
 			cfg:         artifactsInvalidTimeout,
 			expectedErr: errArtifactsServerInvalidTimeout,
 		},
+		{
+			name:        "empty_listener",
+			cfg:         emptyListeners,
+			expectedErr: errEmptyListener,
+		},
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
@@ -77,6 +82,13 @@ func TestConfigValidate(t *testing.T) {
 	}
 }
 
+func emptyListeners(cfg *Config) {
+	cfg.ListenHTTPSStrings = MultiStringFlag{
+		value:     []string{"127.0.0.1:8080", "", ":8081"},
+		separator: ",",
+	}
+}
+
 func noListeners(cfg *Config) {
 	cfg.ListenHTTPStrings = MultiStringFlag{separator: ","}
 	cfg.ListenHTTPSStrings = MultiStringFlag{separator: ","}
@@ -123,7 +135,11 @@ func artifactsInvalidTimeout(cfg *Config) {
 func validConfig() Config {
 	cfg := Config{
 		ListenHTTPStrings: MultiStringFlag{
-			value:     []string{"127.0.0.1:80"},
+			value:     []string{"127.0.0.1:80", ":8081"},
+			separator: ",",
+		},
+		ListenHTTPSStrings: MultiStringFlag{
+			value:     []string{"127.0.0.1:", ":8082"},
 			separator: ",",
 		},
 		ArtifactsServer: ArtifactsServer{