Modify Kratos traits to hold single string group

Due to the ORY Kratos claims which has no group/groups, and as
discussed regarding mapping idp groups to Claims.Team which is string
type, Added idpGroup to kratos trait which is also string type. Both
Identity idpGroup and Claim.Team can be mapped without fail in mapper
config.

_kratos/identity.schema.json

@@ -36,12 +36,9 @@
             }
           }
         },
-        "idp_groups": {
-          "title": "IDP groups",
-          "type": "array",
-          "items": {
-              "type": "string"
-          }
+        "idp_group": {
+          "title": "IDP group",
+          "type": "string",
         }
       },
       "required": [

pkg/service/user.go

@@ -68,7 +68,7 @@ type userTraits struct {
 	Email     string
 	FirstName string
 	LastName  string
-	IdpGroups []string `json:"idp_groups"`
+	IdpGroup  string `json:"idp_group"`
 }
 
 // FIXME: find a better way to do this
@@ -97,22 +97,16 @@ func getUserTraits(traits map[string]interface{}) userTraits {
 	if !ok {
 		lname = ""
 	}
-
-	igStr := []string{}
-	ig, ok := traits["idp_groups"]
-	if ok {
-		igList := ig.([]interface{})
-		igStr = make([]string, len(igList))
-		for i, g := range igList {
-			igStr[i] = g.(string)
-		}
+	idpGroup, ok := traits["idp_group"]
+	if !ok {
+		idpGroup = ""
 	}
 
 	return userTraits{
 		Email:     email.(string),
 		FirstName: fname.(string),
 		LastName:  lname.(string),
-		IdpGroups: igStr,
+		IdpGroup:  idpGroup.(string),
 	}
 }
 
@@ -466,7 +460,7 @@ func (s *userService) Create(ctx context.Context, user *userv3.User) (*userv3.Us
 
 func (s *userService) identitiesModelToUser(ctx context.Context, db bun.IDB, user *userv3.User, usr *models.KratosIdentities) (*userv3.User, error) {
 	traits := getUserTraits(usr.Traits)
-	idpGroups := traits.IdpGroups
+	idpGroup := traits.IdpGroup
 	groups, err := dao.GetGroups(ctx, db, usr.ID)
 	if err != nil {
 		return &userv3.User{}, err
@@ -483,7 +477,7 @@ func (s *userService) identitiesModelToUser(ctx context.Context, db bun.IDB, use
 
 		// idp groups will be available in both traits and groups and
 		// needs to be filetered out
-		if !utils.Contains(idpGroups, g.Name) {
+		if idpGroup != g.Name {
 			groupNames = append(groupNames, g.Name)
 		}
 	}
@@ -507,7 +501,7 @@ func (s *userService) identitiesModelToUser(ctx context.Context, db bun.IDB, use
 		FirstName:             traits.FirstName,
 		LastName:              traits.LastName,
 		Groups:                groupNames,
-		IdpGroups:             idpGroups,
+		IdpGroups:             []string{idpGroup},
 		ProjectNamespaceRoles: roles,
 	}
 
@@ -717,7 +711,12 @@ func (s *userService) Update(ctx context.Context, user *userv3.User) (*userv3.Us
 		}
 
 		// Add idp groups to user so that it gets added on update
-		user.Spec.IdpGroups = getUserTraits(usr.Traits).IdpGroups
+		idpGroupTrait := getUserTraits(usr.Traits).IdpGroup
+		if idpGroupTrait == "" {
+			user.Spec.IdpGroups = []string{}
+		} else {
+			user.Spec.IdpGroups = []string{idpGroupTrait}
+		}
 		user, groupsAfter, err := s.createGroupAccountRelations(ctx, tx, usr.ID, user)
 		if err != nil {
 			tx.Rollback()
@@ -968,23 +967,25 @@ func (s *userService) UpdateIdpUserGroupPolicy(ctx context.Context, op, id, trai
 	if err != nil {
 		return fmt.Errorf("encountered error unmarshing payload to userInfo: %s", err)
 	}
-	// TODO: Revisit to only run by IDP users and not by any other
-	// user
-	if len(userInfo.IdpGroups) == 0 {
+	// Early return if idpGroup is empty.
+	if strings.Trim(userInfo.IdpGroup, " ") == "" {
 		return fmt.Errorf("empty idp groups for user with id %s", id)
 	}
 
-	// Get existing user group so that the update does not wipe them out
+	// Get existing user group so that the update does not wipe
+	// them out.
 	userGroups, err := dao.GetGroups(ctx, s.db, userUUID)
-	ugn := []string{}
-	for _, g := range userGroups {
-		if !utils.Contains(userInfo.IdpGroups, g.Name) {
-			ugn = append(ugn, g.Name)
-		}
-	}
 	if err != nil {
 		return fmt.Errorf("empty to find existing groups for user with id %s", id)
 	}
+
+	// All existing groups except idpGroup
+	ugn := []string{}
+	for _, g := range userGroups {
+		if userInfo.IdpGroup != g.Name {
+			ugn = append(ugn, g.Name)
+		}
+	}
 	user = &userv3.User{
 		Metadata: &v3.Metadata{
 			Name: userInfo.Email,
@@ -993,7 +994,7 @@ func (s *userService) UpdateIdpUserGroupPolicy(ctx context.Context, op, id, trai
 			FirstName: userInfo.FirstName,
 			LastName:  userInfo.LastName,
 			Groups:    ugn,
-			IdpGroups: userInfo.IdpGroups,
+			IdpGroups: []string{userInfo.IdpGroup},
 		},
 	}
 	switch op {