initial commit

tests/integration/group_dm_security_boundaries_test.go

@@ -0,0 +1,92 @@
+/*
+ * Copyright (C) 2026 Fluxer Contributors
+ *
+ * This file is part of Fluxer.
+ *
+ * Fluxer is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Fluxer is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with Fluxer. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package integration
+
+import (
+	"fmt"
+	"net/http"
+	"testing"
+)
+
+// TestGroupDMSecurityBoundaries tests group DM privacy
+func TestGroupDMSecurityBoundaries(t *testing.T) {
+	client := newTestClient(t)
+	creator := createTestAccount(t, client)
+	recipient := createTestAccount(t, client)
+	attacker := createTestAccount(t, client)
+
+	createFriendship(t, client, creator, recipient)
+
+	groupDMPayload := map[string]any{
+		"recipients": []string{recipient.UserID},
+	}
+	resp, err := client.postJSONWithAuth("/users/@me/channels", groupDMPayload, creator.Token)
+	if err != nil {
+		t.Fatalf("failed to create group DM: %v", err)
+	}
+	assertStatus(t, resp, http.StatusOK)
+	var groupDM struct {
+		ID string `json:"id"`
+	}
+	decodeJSONResponse(t, resp, &groupDM)
+
+	resp, err = client.getWithAuth(fmt.Sprintf("/channels/%s/messages?limit=10", groupDM.ID), attacker.Token)
+	if err != nil {
+		t.Fatalf("failed to attempt group DM access: %v", err)
+	}
+	if resp.StatusCode != http.StatusForbidden && resp.StatusCode != http.StatusNotFound {
+		t.Fatalf("expected 403/404 for unauthorized group DM access, got %d", resp.StatusCode)
+	}
+	resp.Body.Close()
+
+	resp, err = client.postJSONWithAuth(fmt.Sprintf("/channels/%s/messages", groupDM.ID), map[string]string{"content": "attacker message"}, attacker.Token)
+	if err != nil {
+		t.Fatalf("failed to attempt group DM message: %v", err)
+	}
+	if resp.StatusCode != http.StatusForbidden && resp.StatusCode != http.StatusNotFound {
+		t.Fatalf("expected 403/404 for unauthorized group DM message, got %d", resp.StatusCode)
+	}
+	resp.Body.Close()
+
+	resp, err = client.putWithAuth(fmt.Sprintf("/channels/%s/recipients/%s", groupDM.ID, attacker.UserID), attacker.Token)
+	if err != nil {
+		t.Fatalf("failed to attempt add self to group DM: %v", err)
+	}
+	if resp.StatusCode != http.StatusForbidden && resp.StatusCode != http.StatusNotFound {
+		t.Fatalf("expected 403/404 for unauthorized group DM join, got %d", resp.StatusCode)
+	}
+	resp.Body.Close()
+
+	resp, err = client.delete(fmt.Sprintf("/channels/%s/recipients/%s", groupDM.ID, recipient.UserID), recipient.Token)
+	if err != nil {
+		t.Fatalf("failed to leave group DM: %v", err)
+	}
+	assertStatus(t, resp, http.StatusNoContent)
+	resp.Body.Close()
+
+	resp, err = client.getWithAuth(fmt.Sprintf("/channels/%s/messages?limit=10", groupDM.ID), recipient.Token)
+	if err != nil {
+		t.Fatalf("failed to check group DM after leave: %v", err)
+	}
+	if resp.StatusCode != http.StatusForbidden && resp.StatusCode != http.StatusNotFound {
+		t.Fatalf("expected 403/404 after leaving group DM, got %d", resp.StatusCode)
+	}
+	resp.Body.Close()
+}