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feat: implement multi-tenant support with dynamic tool registration

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Implements comprehensive multi-tenant support to fix n8n API tools not being dynamically registered when instance context is provided via headers. Includes critical security and performance improvements identified during code review.

Changes:
- Add ENABLE_MULTI_TENANT configuration option for dynamic instance support
- Fix tool registration to check instance context in addition to env vars
- Implement session isolation strategies (instance-based and shared)
- Add validation for instance context creation from headers
- Enhance security logging with sanitized sensitive data
- Add locking mechanism to prevent race conditions in session switches
- Improve URL validation to handle edge cases (localhost, IPs, ports)
- Include configuration hash in session IDs to prevent collisions
- Add type-safe header extraction with MultiTenantHeaders interface
- Add comprehensive test scripts for multi-tenant scenarios

Fixes issue where "Method not found" errors occurred in multi-tenant deployments because n8n API tools weren't being registered dynamically based on instance context.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>
This commit is contained in:
czlonkowski
2025-09-20 01:13:02 +02:00
parent 424f8ae1ff
commit f237fad1e8
6 changed files with 494 additions and 25 deletions
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15
.env.example
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@@ -69,6 +69,21 @@ AUTH_TOKEN=your-secure-token-here
# Default: 0 (disabled)
# TRUST_PROXY=0
# =========================
# MULTI-TENANT CONFIGURATION
# =========================
# Enable multi-tenant mode for dynamic instance support
# When enabled, n8n API tools will be available for all sessions,
# and instance configuration will be determined from HTTP headers
# Default: false (single-tenant mode using environment variables)
ENABLE_MULTI_TENANT=false
# Session isolation strategy for multi-tenant mode
# - "instance": Create separate sessions per instance ID (recommended)
# - "shared": Share sessions but switch contexts (advanced)
# Default: instance
# MULTI_TENANT_SESSION_STRATEGY=instance
# =========================
# N8N API CONFIGURATION
# =========================