Repository: onedr0p/exportarr (go)

Issue:
Update flag `--enable-additional-metric` should be `--enable-additional-metrics`
# Details

**What steps did you take and what happened:**

Looks like I missed the change on this, but we should update the flag to be `--enable-additional-metrics` instead of `--enable-additional-metric`


Pull request description:
Ensure Backwards compatiblity of new flags & envvar names
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**Description of the change**

Small change. The move to `koanf` and the addition of `form-auth` were going to be breaking changes. I'd meant to ensure backwards compatibility prior, but had forgotten until I updated the readme with the new options.

With this PR, the old option names are still hidden (`basic-auth-username` -> `auth-username`, `basic-auth-password` -> `auth-password` and `APIKEY_FILE` -> `API_KEY_FILE`), but they will continue to work for those who already have them configured. I added notes in the code to remove them when we do a major version bump.

**Benefits**

We don't break people's setups :-D

**Possible drawbacks**

<!-- Describe any known limitations with your change -->

**Applicable issues**

<!-- Enter any applicable Issues here (You can reference an issue using #) -->
- fixes #121 

**Additional information**

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Patch:
diff --git a/internal/commands/root.go b/internal/commands/root.go
index 9e8f98d..4494dd7 100644
--- a/internal/commands/root.go
+++ b/internal/commands/root.go
@@ -12,6 +12,7 @@ import (
 	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/client_golang/prometheus/promhttp"
 	"github.com/spf13/cobra"
+	flag "github.com/spf13/pflag"
 	"go.uber.org/zap"
 	"go.uber.org/zap/zapcore"
 
@@ -45,16 +46,21 @@ func init() {
 	rootCmd.PersistentFlags().String("log-format", "console", "Log format (console, json)")
 	rootCmd.PersistentFlags().StringP("config", "c", "", "*arr config.xml file for parsing authentication information")
 	rootCmd.PersistentFlags().StringP("url", "u", "", "URL to *arr instance")
-	rootCmd.PersistentFlags().StringP("api-key", "k", "", "API Key for *arr instance")
-	rootCmd.PersistentFlags().StringP("api-key-file", "f", "", "File containing API Key for *arr instance")
-	rootCmd.PersistentFlags().Int("port", 0, "Port to listen on")
+	rootCmd.PersistentFlags().StringP("api-key", "a", "", "API Key for *arr instance")
+	rootCmd.PersistentFlags().String("api-key-file", "", "File containing API Key for *arr instance")
+	rootCmd.PersistentFlags().IntP("port", "p", 0, "Port to listen on")
 	rootCmd.PersistentFlags().StringP("interface", "i", "", "IP address to listen on")
 	rootCmd.PersistentFlags().Bool("disable-ssl-verify", false, "Disable SSL verification")
-	rootCmd.PersistentFlags().String("auth-username", "", "Username for basic auth")
-	rootCmd.PersistentFlags().String("auth-password", "", "Password for basic auth")
+	rootCmd.PersistentFlags().String("auth-username", "", "Username for basic or form auth")
+	rootCmd.PersistentFlags().String("auth-password", "", "Password for basic or form auth")
 	rootCmd.PersistentFlags().Bool("form-auth", false, "Use form based authentication")
 	rootCmd.PersistentFlags().Bool("enable-unknown-queue-items", false, "Enable unknown queue items")
-	rootCmd.PersistentFlags().Bool("enable-additional-metric", false, "Enable additional metric")
+	rootCmd.PersistentFlags().Bool("enable-additional-metrics", false, "Enable additional metrics")
+
+	// Backwards Compatibility - normalize function will hide these from --help. remove in v2.0.0
+	rootCmd.PersistentFlags().String("basic-auth-username", "", "Username for basic or form auth")
+	rootCmd.PersistentFlags().String("basic-auth-password", "", "Password for basic or form auth")
+	rootCmd.PersistentFlags().SetNormalizeFunc(backwardsCompatibilityNormalizeFunc)
 }
 
 func initConfig() {
@@ -154,3 +160,13 @@ func logRequest(handler http.Handler) http.Handler {
 		handler.ServeHTTP(w, r)
 	})
 }
+
+func backwardsCompatibilityNormalizeFunc(f *flag.FlagSet, name string) flag.NormalizedName {
+	if name == "basic-auth-username" {
+		return flag.NormalizedName("auth-username")
+	}
+	if name == "basic-auth-password" {
+		return flag.NormalizedName("auth-password")
+	}
+	return flag.NormalizedName(name)
+}
diff --git a/internal/config/config.go b/internal/config/config.go
index 96640fc..4336a70 100644
--- a/internal/config/config.go
+++ b/internal/config/config.go
@@ -33,7 +33,7 @@ type Config struct {
 	AuthPassword            string         `koanf:"auth-password"`
 	FormAuth                bool           `koanf:"form-auth"`
 	EnableUnknownQueueItems bool           `koanf:"enable-unknown-queue-items"`
-	EnableAdditionalMetrics bool           `koanf:"enable-additional-metric"`
+	EnableAdditionalMetrics bool           `koanf:"enable-additional-metrics"`
 	Prowlarr                ProwlarrConfig `koanf:"prowlarr"`
 	k                       *koanf.Koanf
 }
@@ -80,7 +80,7 @@ func LoadConfig(flags *flag.FlagSet) (*Config, error) {
 		s = strings.ToLower(s)
 		s = strings.Replace(s, "__", ".", -1)
 		s = strings.Replace(s, "_", "-", -1)
-		return s
+		return backwardsCompatibilityTransforms(s)
 	}), nil)
 	if err != nil {
 		return nil, err
@@ -172,3 +172,17 @@ func (c *Config) Translates() map[string]string {
 		"EnableAdditionalMetrics": "enable-additional-metric",
 	}
 }
+
+// Remove in v2.0.0
+func backwardsCompatibilityTransforms(s string) string {
+	switch s {
+	case "apikey-file":
+		return "api-key-file"
+	case "basic-auth-username":
+		return "auth-username"
+	case "basic-auth-password":
+		return "auth-password"
+	default:
+		return s
+	}
+}


Test patch:
diff --git a/internal/commands/root_test.go b/internal/commands/root_test.go
new file mode 100644
index 0000000..1687726
--- /dev/null
+++ b/internal/commands/root_test.go
@@ -0,0 +1,22 @@
+package commands
+
+import (
+	"testing"
+
+	"github.com/onedr0p/exportarr/internal/config"
+	"github.com/stretchr/testify/require"
+)
+
+func TestBackwardsCompatibility(t *testing.T) {
+	flags := rootCmd.PersistentFlags()
+	flags.Set("url", "http://localhost")
+	flags.Set("api-key", "abcdef0123456789abcdef0123456789")
+	flags.Set("basic-auth-username", "user")
+	flags.Set("basic-auth-password", "pass")
+
+	require := require.New(t)
+	config, err := config.LoadConfig(flags)
+	require.NoError(err)
+	require.Equal("user", config.AuthUsername)
+	require.Equal("pass", config.AuthPassword)
+}
diff --git a/internal/config/config_test.go b/internal/config/config_test.go
index dd69dff..c47a882 100644
--- a/internal/config/config_test.go
+++ b/internal/config/config_test.go
@@ -21,7 +21,7 @@ func testFlagSet() *pflag.FlagSet {
 	out.String("auth-password", "", "Password for basic auth")
 	out.Bool("form-auth", false, "Use form based authentication")
 	out.Bool("enable-unknown-queue-items", false, "Enable unknown queue items")
-	out.Bool("enable-additional-metric", false, "Enable additional metric")
+	out.Bool("enable-additional-metrics", false, "Enable additional metrics")
 	return out
 }
 func TestLoadConfig_Defaults(t *testing.T) {
@@ -48,7 +48,7 @@ func TestLoadConfig_Flags(t *testing.T) {
 	flags.Set("auth-password", "pass")
 	flags.Set("form-auth", "true")
 	flags.Set("enable-unknown-queue-items", "true")
-	flags.Set("enable-additional-metric", "true")
+	flags.Set("enable-additional-metrics", "true")
 
 	require := require.New(t)
 	config, err := LoadConfig(flags)
@@ -90,7 +90,7 @@ func TestLoadConfig_Environment(t *testing.T) {
 	t.Setenv("AUTH_PASSWORD", "pass")
 	t.Setenv("FORM_AUTH", "true")
 	t.Setenv("ENABLE_UNKNOWN_QUEUE_ITEMS", "true")
-	t.Setenv("ENABLE_ADDITIONAL_METRIC", "true")
+	t.Setenv("ENABLE_ADDITIONAL_METRICS", "true")
 
 	config, err := LoadConfig(&pflag.FlagSet{})
 	require.NoError(err)
@@ -109,6 +109,24 @@ func TestLoadConfig_Environment(t *testing.T) {
 	require.Equal("v3", config.ApiVersion)
 }
 
+func TestLoadConfig_BackwardsCompatibility(t *testing.T) {
+	require := require.New(t)
+
+	// Set environment variables
+	t.Setenv("URL", "http://localhost:8989")
+	t.Setenv("APIKEY_FILE", "./test_fixtures/api_key")
+	t.Setenv("PORT", "1234")
+	t.Setenv("BASIC_AUTH_USERNAME", "user")
+	t.Setenv("BASIC_AUTH_PASSWORD", "pass")
+
+	config, err := LoadConfig(&pflag.FlagSet{})
+	require.NoError(err)
+
+	require.Equal("abcdef0123456789abcdef0123456783", config.ApiKey)
+	require.Equal("user", config.AuthUsername)
+	require.Equal("pass", config.AuthPassword)
+}
+
 func TestLoadConfig_XMLConfig(t *testing.T) {
 	flags := testFlagSet()
 	flags.Set("config", "test_fixtures/config.test_xml")