Refactor arrtrix webhook to use fixed path and remove legacy config

- Switch arrtrix webhook to a fixed path: /_arrtrix/webhook
- Remove Radarr-specific and secret-based config from arrtrix
- Simplify connector and webhook handler logic
- Update NixOS module to drop legacy webhook config
- Add new tests for generic arrtrix webhook handler

packages/arrtrix/pkg/connector/config.go

@@ -14,40 +14,23 @@ import (
 //go:embed example-config.yaml
 var ExampleConfig string
 
-type Config struct {
-	Webhooks WebhooksConfig `yaml:"webhooks"`
-}
-
-type WebhooksConfig struct {
-	Radarr webhook.RadarrConfig `yaml:"radarr"`
-}
-
-func (c *Config) applyDefaults() {
-	c.Webhooks.Radarr.ApplyDefaults()
-}
-
-func (c *Config) Validate() error {
-	return c.Webhooks.Radarr.Validate()
-}
+type Config struct{}
 
 func upgradeConfig(helper up.Helper) {}
 
 func (s *ArrtrixConnector) GetConfig() (string, any, up.Upgrader) {
-	s.Config.applyDefaults()
 	return ExampleConfig, &s.Config, up.SimpleUpgrader(upgradeConfig)
 }
 
 func (s *ArrtrixConnector) ValidateConfig() error {
-	s.Config.applyDefaults()
-	return s.Config.Validate()
+	return nil
 }
 
 func (s *ArrtrixConnector) MountRoutes(router *http.ServeMux) error {
-	s.Config.applyDefaults()
 	if s.Bridge == nil {
 		return fmt.Errorf("bridge is not initialized")
 	}
-	return webhook.MountRadarr(router, s.Bridge, s.Config.Webhooks.Radarr)
+	return webhook.MountArr(router, s.Bridge)
 }
 
 var _ bridgev2.ConfigValidatingNetwork = (*ArrtrixConnector)(nil)

packages/arrtrix/pkg/connector/config_test.go

@@ -1,23 +0,0 @@
-package connector
-
-import "testing"
-
-func TestConfigDefaultsApplyRadarrWebhookPath(t *testing.T) {
-	var cfg Config
-
-	cfg.applyDefaults()
-
-	if cfg.Webhooks.Radarr.Path == "" {
-		t.Fatal("expected radarr webhook path default to be set")
-	}
-}
-
-func TestConfigValidateRejectsEnabledWebhookWithoutSecret(t *testing.T) {
-	cfg := Config{}
-	cfg.Webhooks.Radarr.Enabled = true
-	cfg.applyDefaults()
-
-	if err := cfg.Validate(); err == nil {
-		t.Fatal("expected missing secret to fail validation")
-	}
-}

packages/arrtrix/pkg/connector/example-config.yaml

@@ -1,10 +1,4 @@
-# Arrtrix-specific runtime options.
+# No network-specific config is required yet.
 #
-webhooks:
-  radarr:
-    enabled: false
-    path: /_arrtrix/webhooks/radarr
-    secret: ""
-    # The first implementation delivers notifications to the only configured
-    # management room. If more than one management room exists, the webhook is
-    # rejected until routing is configured more explicitly.
+# Arr-stack webhooks are exposed automatically on the fixed built-in path:
+#   POST /_arrtrix/webhook