Add methods to get attributes more easily in Go API (#2299)

* Add methods to get attributes more easily in Go API

* Add type check

api/managedgroups/oidc_managed_group_attributes.gen.go

@@ -1,6 +1,37 @@
 // Code generated by "make api"; DO NOT EDIT.
 package managedgroups
 
+import (
+	"fmt"
+
+	"github.com/mitchellh/mapstructure"
+)
+
 type OidcManagedGroupAttributes struct {
 	Filter string `json:"filter,omitempty"`
 }
+
+func AttributesMapToOidcManagedGroupAttributes(in map[string]interface{}) (*OidcManagedGroupAttributes, error) {
+	if in == nil {
+		return nil, fmt.Errorf("nil input map")
+	}
+	var out OidcManagedGroupAttributes
+	dec, err := mapstructure.NewDecoder(&mapstructure.DecoderConfig{
+		Result:  &out,
+		TagName: "json",
+	})
+	if err != nil {
+		return nil, fmt.Errorf("error creating mapstructure decoder: %w", err)
+	}
+	if err := dec.Decode(in); err != nil {
+		return nil, fmt.Errorf("error decoding: %w", err)
+	}
+	return &out, nil
+}
+
+func (pt *ManagedGroup) GetOidcManagedGroupAttributes() (*OidcManagedGroupAttributes, error) {
+	if pt.Type != "oidc" {
+		return nil, fmt.Errorf("asked to fetch %s-type attributes but managed-group is of type %s", "oidc", pt.Type)
+	}
+	return AttributesMapToOidcManagedGroupAttributes(pt.Attributes)
+}