if used as library, allow that the auth and bridge plugins can be set by (#79)

struct, and not only by name

broker/broker.go

@@ -92,8 +92,8 @@ func NewBroker(config *Config) (*Broker, error) {
 		b.tlsConfig = tlsconfig
 	}
 
-	b.auth = auth.NewAuth(b.config.Plugin.Auth)
-	b.bridgeMQ = bridge.NewBridgeMQ(b.config.Plugin.Bridge)
+	b.auth = b.config.Plugin.Auth
+	b.bridgeMQ = b.config.Plugin.Bridge
 
 	return b, nil
 }

broker/config.go

@@ -11,6 +11,8 @@ import (
 	"os"
 
 	"github.com/fhmq/hmq/logger"
+	"github.com/fhmq/hmq/plugins/auth"
+	"github.com/fhmq/hmq/plugins/bridge"
 	"go.uber.org/zap"
 )
 
@@ -32,6 +34,11 @@ type Config struct {
 }
 
 type Plugins struct {
+	Auth   auth.Auth
+	Bridge bridge.BridgeMQ
+}
+
+type NamedPlugins struct {
 	Auth   string
 	Bridge string
 }
@@ -152,6 +159,18 @@ func LoadConfig(filename string) (*Config, error) {
 	return &config, nil
 }
 
+
+func (p *Plugins) UnmarshalJSON(b []byte) error {
+	var named NamedPlugins
+	err := json.Unmarshal(b, &named)
+	if err != nil {
+		return err
+	}
+	p.Auth = auth.NewAuth(named.Auth)
+	p.Bridge = bridge.NewBridgeMQ(named.Bridge)
+	return nil
+}
+
 func (config *Config) check() error {
 
 	if config.Worker == 0 {