Add NATS support

README.md

@@ -488,6 +488,15 @@ err := viper.ReadRemoteConfig()
 
 Of course, you're allowed to use `SecureRemoteProvider` also
 
+
+#### NATS
+
+```go
+viper.AddRemoteProvider("nats", "nats://127.0.0.1:4222", "myapp.config")
+viper.SetConfigType("json")
+err := viper.ReadRemoteConfig()
+```
+
 ### Remote Key/Value Store Example - Encrypted
 
 ```go

remote/remote.go

@@ -91,6 +91,8 @@ func getConfigManager(rp viper.RemoteProvider) (crypt.ConfigManager, error) {
 			cm, err = crypt.NewEtcdV3ConfigManager(endpoints, kr)
 		case "firestore":
 			cm, err = crypt.NewFirestoreConfigManager(endpoints, kr)
+		case "nats":
+			cm, err = crypt.NewNatsConfigManager(endpoints, kr)
 		default:
 			cm, err = crypt.NewConsulConfigManager(endpoints, kr)
 		}
@@ -102,6 +104,8 @@ func getConfigManager(rp viper.RemoteProvider) (crypt.ConfigManager, error) {
 			cm, err = crypt.NewStandardEtcdV3ConfigManager(endpoints)
 		case "firestore":
 			cm, err = crypt.NewStandardFirestoreConfigManager(endpoints)
+		case "nats":
+			cm, err = crypt.NewStandardNatsConfigManager(endpoints)
 		default:
 			cm, err = crypt.NewStandardConsulConfigManager(endpoints)
 		}

viper.go

@@ -301,7 +301,7 @@ func NewWithOptions(opts ...Option) *Viper {
 func Reset() {
 	v = New()
 	SupportedExts = []string{"json", "toml", "yaml", "yml", "properties", "props", "prop", "hcl", "tfvars", "dotenv", "env", "ini"}
-	SupportedRemoteProviders = []string{"etcd", "etcd3", "consul", "firestore"}
+	SupportedRemoteProviders = []string{"etcd", "etcd3", "consul", "firestore", "nats"}
 }
 
 // TODO: make this lazy initialization instead
@@ -420,7 +420,7 @@ type RemoteProvider interface {
 var SupportedExts = []string{"json", "toml", "yaml", "yml", "properties", "props", "prop", "hcl", "tfvars", "dotenv", "env", "ini"}
 
 // SupportedRemoteProviders are universally supported remote providers.
-var SupportedRemoteProviders = []string{"etcd", "etcd3", "consul", "firestore"}
+var SupportedRemoteProviders = []string{"etcd", "etcd3", "consul", "firestore", "nats"}
 
 // OnConfigChange sets the event handler that is called when a config file changes.
 func OnConfigChange(run func(in fsnotify.Event)) { v.OnConfigChange(run) }
@@ -584,8 +584,8 @@ func (v *Viper) AddConfigPath(in string) {
 
 // AddRemoteProvider adds a remote configuration source.
 // Remote Providers are searched in the order they are added.
-// provider is a string value: "etcd", "etcd3", "consul" or "firestore" are currently supported.
-// endpoint is the url.  etcd requires http://ip:port  consul requires ip:port
+// provider is a string value: "etcd", "etcd3", "consul", "firestore" or "nats" are currently supported.
+// endpoint is the url.  etcd requires http://ip:port, consul requires ip:port, nats requires nats://ip:port
 // path is the path in the k/v store to retrieve configuration
 // To retrieve a config file called myapp.json from /configs/myapp.json
 // you should set path to /configs and set config name (SetConfigName()) to
@@ -615,7 +615,7 @@ func (v *Viper) AddRemoteProvider(provider, endpoint, path string) error {
 
 // AddSecureRemoteProvider adds a remote configuration source.
 // Secure Remote Providers are searched in the order they are added.
-// provider is a string value: "etcd", "etcd3", "consul" or "firestore" are currently supported.
+// provider is a string value: "etcd", "etcd3", "consul", "firestore" or "nats" are currently supported.
 // endpoint is the url.  etcd requires http://ip:port  consul requires ip:port
 // secretkeyring is the filepath to your openpgp secret keyring.  e.g. /etc/secrets/myring.gpg
 // path is the path in the k/v store to retrieve configuration