Add command to validate configuration

config/validate.go

@@ -0,0 +1,42 @@
+package config
+
+import (
+	yaml "github.com/cloudfoundry-incubator/candiedyaml"
+	"github.com/xeipuuv/gojsonschema"
+)
+
+// TODO: use this function from libcompose
+func convertKeysToStrings(item interface{}) interface{} {
+	switch typedDatas := item.(type) {
+	case map[string]interface{}:
+		for key, value := range typedDatas {
+			typedDatas[key] = convertKeysToStrings(value)
+		}
+		return typedDatas
+	case map[interface{}]interface{}:
+		newMap := make(map[string]interface{})
+		for key, value := range typedDatas {
+			stringKey := key.(string)
+			newMap[stringKey] = convertKeysToStrings(value)
+		}
+		return newMap
+	case []interface{}:
+		for i, value := range typedDatas {
+			typedDatas[i] = append(typedDatas, convertKeysToStrings(value))
+		}
+		return typedDatas
+	default:
+		return item
+	}
+}
+
+func Validate(bytes []byte) (*gojsonschema.Result, error) {
+	var rawCfg map[string]interface{}
+	if err := yaml.Unmarshal([]byte(bytes), &rawCfg); err != nil {
+		return nil, err
+	}
+	rawCfg = convertKeysToStrings(rawCfg).(map[string]interface{})
+	loader := gojsonschema.NewGoLoader(rawCfg)
+	schemaLoader := gojsonschema.NewStringLoader(schema)
+	return gojsonschema.Validate(schemaLoader, loader)
+}