feat: plugins integration.

pkg/server/middleware/plugins.go

@@ -0,0 +1,32 @@
+package middleware
+
+import (
+	"errors"
+	"fmt"
+
+	"github.com/containous/traefik/v2/pkg/config/dynamic"
+)
+
+func findPluginConfig(rawConfig map[string]dynamic.PluginConf) (string, map[string]interface{}, error) {
+	if len(rawConfig) != 1 {
+		return "", nil, errors.New("plugin: invalid configuration: no configuration or too many plugin definition")
+	}
+
+	var pluginType string
+	var rawPluginConfig map[string]interface{}
+
+	for pType, pConfig := range rawConfig {
+		pluginType = pType
+		rawPluginConfig = pConfig
+	}
+
+	if pluginType == "" {
+		return "", nil, errors.New("plugin: missing plugin type")
+	}
+
+	if len(rawPluginConfig) == 0 {
+		return "", nil, fmt.Errorf("plugin: missing plugin configuration: %s", pluginType)
+	}
+
+	return pluginType, rawPluginConfig, nil
+}