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fix(p0): remove incorrect node type normalization before n8n API calls

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## Bug Description
handleCreateWorkflow and handleUpdateFullWorkflow were incorrectly
normalizing node types from FULL form (n8n-nodes-base.webhook) to
SHORT form (nodes-base.webhook) before validation and API calls.

This caused 100% failure rate for workflow creation because:
- n8n API requires FULL form (n8n-nodes-base.*)
- Database stores SHORT form (nodes-base.*)
- NodeTypeNormalizer converts TO SHORT form (for database)
- But was being used BEFORE API calls (incorrect)

## Root Cause
NodeTypeNormalizer was designed for database lookups but was
incorrectly applied to API operations. The method name
`normalizeToFullForm()` is misleading - it actually normalizes
TO SHORT form.

## Changes
1. handlers-n8n-manager.ts:
   - Removed NodeTypeNormalizer.normalizeWorkflowNodeTypes() from
     handleCreateWorkflow (line 288)
   - Removed normalization from handleUpdateFullWorkflow (line 544-557)
   - Added proactive SHORT form detection with helpful errors
   - Added comments explaining n8n API expects FULL form

2. node-type-normalizer.ts:
   - Added prominent WARNING about not using before API calls
   - Added examples showing CORRECT vs INCORRECT usage
   - Clarified this is FOR DATABASE OPERATIONS ONLY

3. handlers-n8n-manager.test.ts:
   - Fixed test to expect FULL form (not SHORT) sent to API
   - Removed incorrect expectedNormalizedInput assertion

4. NEW: workflow-creation-node-type-format.test.ts:
   - 7 integration tests with real validation (unmocked)
   - Tests FULL form acceptance, SHORT form rejection
   - Tests real-world workflows (webhook, schedule trigger)
   - Regression test to prevent bug reintroduction

## Verification
Before fix:
❌ Manual Trigger → Set: FAILED
❌ Webhook → HTTP Request: FAILED
Failure rate: 100%

After fix:
✅ Manual Trigger → Set: SUCCESS (ID: kTAaDZwdpzj8gqzM)
✅ Webhook → HTTP Request: SUCCESS (ID: aPtQUb54uuHIqX52)
✅ All 39 tests passing (32 unit + 7 integration)
Success rate: 100%

## Impact
- Fixes: Complete blocking bug preventing all workflow creation
- Risk: Zero (removing buggy behavior)
- Breaking: None (external API unchanged)

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

Co-Authored-By: Claude <noreply@anthropic.com>
This commit is contained in:
czlonkowski
2025-10-03 11:43:49 +02:00
parent 5bf1bc46e9
commit d875ac1e0c
7 changed files with 578 additions and 162 deletions
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313
tests/integration/workflow-creation-node-type-format.test.ts Normal file
View File

@@ -0,0 +1,313 @@
/**
* Integration test for workflow creation with node type format validation
*
* This test validates that workflows are correctly validated with FULL form node types
* (n8n-nodes-base.*) as required by the n8n API, without normalization to SHORT form.
*
* Background: Bug in handlers-n8n-manager.ts was normalizing node types to SHORT form
* (nodes-base.*) before validation, causing validation to reject all workflows.
*/
import { describe, it, expect } from 'vitest';
import { validateWorkflowStructure } from '@/services/n8n-validation';
describe('Workflow Creation Node Type Format (Integration)', () => {
describe('validateWorkflowStructure with FULL form node types', () => {
it('should accept workflows with FULL form node types (n8n-nodes-base.*)', () => {
const workflow = {
name: 'Test Workflow',
nodes: [
{
id: 'manual-1',
name: 'Manual Trigger',
type: 'n8n-nodes-base.manualTrigger', // FULL form
typeVersion: 1,
position: [250, 300] as [number, number],
parameters: {}
},
{
id: 'set-1',
name: 'Set Data',
type: 'n8n-nodes-base.set', // FULL form
typeVersion: 3.4,
position: [450, 300] as [number, number],
parameters: {
mode: 'manual',
assignments: {
assignments: [{
id: '1',
name: 'test',
value: 'hello',
type: 'string'
}]
}
}
}
],
connections: {
'Manual Trigger': {
main: [[{
node: 'Set Data',
type: 'main',
index: 0
}]]
}
}
};
const errors = validateWorkflowStructure(workflow);
expect(errors).toEqual([]);
});
it('should reject workflows with SHORT form node types (nodes-base.*)', () => {
const workflow = {
name: 'Test Workflow',
nodes: [
{
id: 'manual-1',
name: 'Manual Trigger',
type: 'nodes-base.manualTrigger', // SHORT form - should be rejected
typeVersion: 1,
position: [250, 300] as [number, number],
parameters: {}
}
],
connections: {}
};
const errors = validateWorkflowStructure(workflow);
expect(errors.length).toBeGreaterThan(0);
expect(errors.some(e =>
e.includes('Invalid node type "nodes-base.manualTrigger"') &&
e.includes('Use "n8n-nodes-base.manualTrigger" instead')
)).toBe(true);
});
it('should accept workflows with LangChain nodes in FULL form', () => {
const workflow = {
name: 'AI Workflow',
nodes: [
{
id: 'manual-1',
name: 'Manual Trigger',
type: 'n8n-nodes-base.manualTrigger',
typeVersion: 1,
position: [250, 300] as [number, number],
parameters: {}
},
{
id: 'agent-1',
name: 'AI Agent',
type: '@n8n/n8n-nodes-langchain.agent', // FULL form
typeVersion: 1,
position: [450, 300] as [number, number],
parameters: {}
}
],
connections: {
'Manual Trigger': {
main: [[{
node: 'AI Agent',
type: 'main',
index: 0
}]]
}
}
};
const errors = validateWorkflowStructure(workflow);
// Should accept FULL form LangChain nodes
// Note: May have other validation errors (missing parameters), but NOT node type errors
const hasNodeTypeError = errors.some(e =>
e.includes('Invalid node type') && e.includes('@n8n/n8n-nodes-langchain.agent')
);
expect(hasNodeTypeError).toBe(false);
});
it('should reject node types without package prefix', () => {
const workflow = {
name: 'Invalid Workflow',
nodes: [
{
id: 'node-1',
name: 'Invalid Node',
type: 'webhook', // No package prefix
typeVersion: 1,
position: [250, 300] as [number, number],
parameters: {}
}
],
connections: {}
};
const errors = validateWorkflowStructure(workflow);
expect(errors.length).toBeGreaterThan(0);
expect(errors.some(e =>
e.includes('Invalid node type "webhook"') &&
e.includes('must include package prefix')
)).toBe(true);
});
});
describe('Real-world workflow examples', () => {
it('should validate webhook workflow correctly', () => {
const workflow = {
name: 'Webhook to HTTP',
nodes: [
{
id: 'webhook-1',
name: 'Webhook',
type: 'n8n-nodes-base.webhook',
typeVersion: 2,
position: [250, 300] as [number, number],
parameters: {
path: 'test-webhook',
httpMethod: 'POST',
responseMode: 'onReceived'
}
},
{
id: 'http-1',
name: 'HTTP Request',
type: 'n8n-nodes-base.httpRequest',
typeVersion: 4.2,
position: [450, 300] as [number, number],
parameters: {
method: 'POST',
url: 'https://example.com/api',
sendBody: true,
bodyParameters: {
parameters: []
}
}
}
],
connections: {
'Webhook': {
main: [[{
node: 'HTTP Request',
type: 'main',
index: 0
}]]
}
}
};
const errors = validateWorkflowStructure(workflow);
expect(errors).toEqual([]);
});
it('should validate schedule trigger workflow correctly', () => {
const workflow = {
name: 'Daily Report',
nodes: [
{
id: 'schedule-1',
name: 'Schedule Trigger',
type: 'n8n-nodes-base.scheduleTrigger',
typeVersion: 1.2,
position: [250, 300] as [number, number],
parameters: {
rule: {
interval: [{
field: 'days',
daysInterval: 1
}]
}
}
},
{
id: 'set-1',
name: 'Set',
type: 'n8n-nodes-base.set',
typeVersion: 3.4,
position: [450, 300] as [number, number],
parameters: {
mode: 'manual',
assignments: {
assignments: []
}
}
}
],
connections: {
'Schedule Trigger': {
main: [[{
node: 'Set',
type: 'main',
index: 0
}]]
}
}
};
const errors = validateWorkflowStructure(workflow);
expect(errors).toEqual([]);
});
});
describe('Regression test for normalization bug', () => {
it('should NOT normalize node types before validation', () => {
// This test ensures that handleCreateWorkflow does NOT call
// NodeTypeNormalizer.normalizeWorkflowNodeTypes() before validation
const fullFormWorkflow = {
name: 'Test',
nodes: [
{
id: '1',
name: 'Manual Trigger',
type: 'n8n-nodes-base.manualTrigger',
typeVersion: 1,
position: [0, 0] as [number, number],
parameters: {}
},
{
id: '2',
name: 'Set',
type: 'n8n-nodes-base.set',
typeVersion: 3.4,
position: [200, 0] as [number, number],
parameters: {
mode: 'manual',
assignments: { assignments: [] }
}
}
],
connections: {
'Manual Trigger': {
main: [[{ node: 'Set', type: 'main', index: 0 }]]
}
}
};
const errors = validateWorkflowStructure(fullFormWorkflow);
// FULL form should pass validation
expect(errors).toEqual([]);
// SHORT form (what normalizer produces) should FAIL validation
const shortFormWorkflow = {
...fullFormWorkflow,
nodes: fullFormWorkflow.nodes.map(node => ({
...node,
type: node.type.replace('n8n-nodes-base.', 'nodes-base.') // Convert to SHORT form
}))
};
const shortFormErrors = validateWorkflowStructure(shortFormWorkflow);
expect(shortFormErrors.length).toBeGreaterThan(0);
expect(shortFormErrors.some(e =>
e.includes('Invalid node type') &&
e.includes('nodes-base.')
)).toBe(true);
});
});
});

17
tests/unit/mcp/handlers-n8n-manager.test.ts
View File

@@ -231,20 +231,9 @@ describe('handlers-n8n-manager', () => {
message: 'Workflow "Test Workflow" created successfully with ID: test-workflow-id',
});
const expectedNormalizedInput = {
name: 'Test Workflow',
nodes: [{
id: 'node1',
name: 'Start',
type: 'nodes-base.start',
typeVersion: 1,
position: [100, 100],
parameters: {},
}],
connections: testWorkflow.connections,
};
expect(mockApiClient.createWorkflow).toHaveBeenCalledWith(expectedNormalizedInput);
expect(n8nValidation.validateWorkflowStructure).toHaveBeenCalledWith(expectedNormalizedInput);
// Should send input as-is to API (n8n expects FULL form: n8n-nodes-base.*)
expect(mockApiClient.createWorkflow).toHaveBeenCalledWith(input);
expect(n8nValidation.validateWorkflowStructure).toHaveBeenCalledWith(input);
});
it('should handle validation errors', async () => {