fix: update external username on idp if auto update is enabled (#7048)

* fix: update external username on idp if auto update is enabled

* update errors package

internal/query/projection/idp_user_link.go

@@ -82,6 +82,10 @@ func (p *idpUserLinkProjection) Reducers() []handler.AggregateReducer {
 					Event:  user.UserIDPExternalIDMigratedType,
 					Reduce: p.reduceExternalIDMigrated,
 				},
+				{
+					Event:  user.UserIDPExternalUsernameChangedType,
+					Reduce: p.reduceExternalUsernameChanged,
+				},
 			},
 		},
 		{
@@ -216,6 +220,27 @@ func (p *idpUserLinkProjection) reduceExternalIDMigrated(event eventstore.Event)
 	), nil
 }
 
+func (p *idpUserLinkProjection) reduceExternalUsernameChanged(event eventstore.Event) (*handler.Statement, error) {
+	e, err := assertEvent[*user.UserIDPExternalUsernameEvent](event)
+	if err != nil {
+		return nil, err
+	}
+
+	return handler.NewUpdateStatement(e,
+		[]handler.Column{
+			handler.NewCol(IDPUserLinkChangeDateCol, e.CreationDate()),
+			handler.NewCol(IDPUserLinkSequenceCol, e.Sequence()),
+			handler.NewCol(IDPUserLinkDisplayNameCol, e.ExternalUsername),
+		},
+		[]handler.Condition{
+			handler.NewCond(IDPUserLinkIDPIDCol, e.IDPConfigID),
+			handler.NewCond(IDPUserLinkUserIDCol, e.Aggregate().ID),
+			handler.NewCond(IDPUserLinkExternalUserIDCol, e.ExternalUserID),
+			handler.NewCond(IDPUserLinkInstanceIDCol, e.Aggregate().InstanceID),
+		},
+	), nil
+}
+
 func (p *idpUserLinkProjection) reduceIDPConfigRemoved(event eventstore.Event) (*handler.Statement, error) {
 	var idpID string
 

internal/query/projection/idp_user_link_test.go

@@ -238,6 +238,41 @@ func TestIDPUserLinkProjection_reduces(t *testing.T) {
 				},
 			},
 		},
+		{
+			name: "reduceExternalUsernameChanged",
+			args: args{
+				event: getEvent(testEvent(
+					user.UserIDPExternalUsernameChangedType,
+					user.AggregateType,
+					[]byte(`{
+	"idpConfigId": "idp-config-id",
+    "userId": "external-user-id",
+	"username": "new-username"
+}`),
+				), eventstore.GenericEventMapper[user.UserIDPExternalUsernameEvent]),
+			},
+			reduce: (&idpUserLinkProjection{}).reduceExternalUsernameChanged,
+			want: wantReduce{
+				aggregateType: user.AggregateType,
+				sequence:      15,
+				executer: &testExecuter{
+					executions: []execution{
+						{
+							expectedStmt: "UPDATE projections.idp_user_links3 SET (change_date, sequence, display_name) = ($1, $2, $3) WHERE (idp_id = $4) AND (user_id = $5) AND (external_user_id = $6) AND (instance_id = $7)",
+							expectedArgs: []interface{}{
+								anyArg{},
+								uint64(15),
+								"new-username",
+								"idp-config-id",
+								"agg-id",
+								"external-user-id",
+								"instance-id",
+							},
+						},
+					},
+				},
+			},
+		},
 		{
 			name: "org IDPConfigRemovedEvent",
 			args: args{