Deactivate SCIM users when delete is blocked

SCIM DELETE returned 500 when a profile was still referenced
elsewhere in the org, which disabled the identity-provider bridge
after repeated sync failures. Fall back to deactivation when delete
is blocked, log the conflict without failing sync, and still
attempt delete for excluded users even when inactive.

Signed-off-by: Sacha Al Himdani <sacha@getprobo.com>

pkg/iam/scim/bridge/bridge_test.go

@@ -0,0 +1,91 @@
+// Copyright (c) 2026 Probo Inc <hello@getprobo.com>.
+//
+// Permission to use, copy, modify, and/or distribute this software for any
+// purpose with or without fee is hereby granted, provided that the above
+// copyright notice and this permission notice appear in all copies.
+//
+// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
+// REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+// AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
+// INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+// LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
+// OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+// PERFORMANCE OF THIS SOFTWARE.
+
+package bridge_test
+
+import (
+	"context"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+
+	scimbridge "go.probo.inc/probo/pkg/iam/scim/bridge"
+	scimclient "go.probo.inc/probo/pkg/iam/scim/bridge/client"
+)
+
+type mockProvider struct {
+	users scimclient.Users
+}
+
+func (p *mockProvider) Name() string {
+	return "mock"
+}
+
+func (p *mockProvider) ListUsers(_ context.Context) (scimclient.Users, error) {
+	return p.users, nil
+}
+
+func TestBridge_Run_DeletesInactiveExcludedUsers(t *testing.T) {
+	t.Parallel()
+
+	deleteCalled := false
+
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		switch {
+		case r.Method == http.MethodGet && r.URL.Path == "/Users":
+			w.Header().Set("Content-Type", "application/scim+json")
+			_, _ = w.Write([]byte(`{
+				"schemas": ["urn:ietf:params:scim:api:messages:2.0:ListResponse"],
+				"totalResults": 1,
+				"startIndex": 1,
+				"itemsPerPage": 100,
+				"Resources": [{
+					"id": "gid://probo/MembershipProfile/abc",
+					"userName": "excluded@example.com",
+					"displayName": "Excluded User",
+					"active": false,
+					"externalId": "ext-1"
+				}]
+			}`))
+		case r.Method == http.MethodDelete:
+			deleteCalled = true
+
+			w.WriteHeader(http.StatusNoContent)
+		default:
+			http.NotFound(w, r)
+		}
+	}))
+	t.Cleanup(server.Close)
+
+	provider := &mockProvider{users: scimclient.Users{}}
+	client := scimclient.NewClient(server.Client(), server.URL, "token")
+	bridge := scimbridge.NewBridge(
+		provider,
+		client,
+		scimbridge.WithExcludedUserNames([]string{"excluded@example.com"}),
+	)
+
+	created, updated, deleted, deactivated, skipped, err := bridge.Run(context.Background())
+
+	require.NoError(t, err)
+	assert.True(t, deleteCalled)
+	assert.Equal(t, 0, created)
+	assert.Equal(t, 0, updated)
+	assert.Equal(t, 1, deleted)
+	assert.Equal(t, 0, deactivated)
+	assert.Equal(t, 0, skipped)
+}