mirror of
https://github.com/czlonkowski/n8n-mcp.git
synced 2026-02-06 05:23:08 +00:00
feat: implement comprehensive expression format validation system
- Add universal expression validator with 100% reliable detection - Implement confidence-based scoring for node-specific recommendations - Add resource locator format detection and validation - Fix pattern matching precision (exact/prefix instead of includes) - Add recursion depth protection (MAX_RECURSION_DEPTH = 100) - Validate resource locator modes (id, url, expression, name, list) - Separate universal rules from node-specific intelligence - Add comprehensive test coverage (94%+ statements) - Prevent common AI agent mistakes with expressions Addresses code review feedback with critical fixes and enhancements. 🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <noreply@anthropic.com>
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czlonkowski
364
tests/unit/services/expression-format-validator.test.ts
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364
tests/unit/services/expression-format-validator.test.ts
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import { describe, it, expect } from 'vitest';
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import { ExpressionFormatValidator } from '../../../src/services/expression-format-validator';
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describe('ExpressionFormatValidator', () => {
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describe('validateAndFix', () => {
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const context = {
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nodeType: 'n8n-nodes-base.httpRequest',
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nodeName: 'HTTP Request',
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nodeId: 'test-id-1'
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};
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describe('Simple string expressions', () => {
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it('should detect missing = prefix for expression', () => {
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const value = '{{ $env.API_KEY }}';
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const issue = ExpressionFormatValidator.validateAndFix(value, 'apiKey', context);
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expect(issue).toBeTruthy();
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expect(issue?.issueType).toBe('missing-prefix');
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expect(issue?.correctedValue).toBe('={{ $env.API_KEY }}');
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expect(issue?.severity).toBe('error');
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});
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it('should accept expression with = prefix', () => {
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const value = '={{ $env.API_KEY }}';
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const issue = ExpressionFormatValidator.validateAndFix(value, 'apiKey', context);
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expect(issue).toBeNull();
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});
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it('should detect mixed content without prefix', () => {
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const value = 'Bearer {{ $env.TOKEN }}';
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const issue = ExpressionFormatValidator.validateAndFix(value, 'authorization', context);
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expect(issue).toBeTruthy();
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expect(issue?.issueType).toBe('missing-prefix');
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expect(issue?.correctedValue).toBe('=Bearer {{ $env.TOKEN }}');
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});
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it('should accept mixed content with prefix', () => {
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const value = '=Bearer {{ $env.TOKEN }}';
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const issue = ExpressionFormatValidator.validateAndFix(value, 'authorization', context);
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expect(issue).toBeNull();
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});
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it('should ignore plain strings without expressions', () => {
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const value = 'https://api.example.com';
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const issue = ExpressionFormatValidator.validateAndFix(value, 'url', context);
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expect(issue).toBeNull();
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});
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});
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describe('Resource Locator fields', () => {
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const githubContext = {
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nodeType: 'n8n-nodes-base.github',
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nodeName: 'GitHub',
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nodeId: 'github-1'
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};
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it('should detect expression in owner field needing resource locator', () => {
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const value = '{{ $vars.GITHUB_OWNER }}';
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const issue = ExpressionFormatValidator.validateAndFix(value, 'owner', githubContext);
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expect(issue).toBeTruthy();
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expect(issue?.issueType).toBe('needs-resource-locator');
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expect(issue?.correctedValue).toEqual({
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__rl: true,
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value: '={{ $vars.GITHUB_OWNER }}',
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mode: 'expression'
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});
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expect(issue?.severity).toBe('error');
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});
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it('should accept resource locator with expression', () => {
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const value = {
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__rl: true,
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value: '={{ $vars.GITHUB_OWNER }}',
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mode: 'expression'
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};
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const issue = ExpressionFormatValidator.validateAndFix(value, 'owner', githubContext);
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expect(issue).toBeNull();
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});
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it('should detect missing prefix in resource locator value', () => {
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const value = {
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__rl: true,
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value: '{{ $vars.GITHUB_OWNER }}',
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mode: 'expression'
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};
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const issue = ExpressionFormatValidator.validateAndFix(value, 'owner', githubContext);
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expect(issue).toBeTruthy();
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expect(issue?.issueType).toBe('missing-prefix');
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expect(issue?.correctedValue.value).toBe('={{ $vars.GITHUB_OWNER }}');
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});
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it('should warn if expression has prefix but should use RL format', () => {
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const value = '={{ $vars.GITHUB_OWNER }}';
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const issue = ExpressionFormatValidator.validateAndFix(value, 'owner', githubContext);
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expect(issue).toBeTruthy();
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expect(issue?.issueType).toBe('needs-resource-locator');
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expect(issue?.severity).toBe('warning');
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});
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});
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describe('Multiple expressions', () => {
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it('should detect multiple expressions without prefix', () => {
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const value = '{{ $json.first }} - {{ $json.last }}';
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const issue = ExpressionFormatValidator.validateAndFix(value, 'fullName', context);
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expect(issue).toBeTruthy();
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expect(issue?.issueType).toBe('missing-prefix');
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expect(issue?.correctedValue).toBe('={{ $json.first }} - {{ $json.last }}');
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});
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it('should accept multiple expressions with prefix', () => {
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const value = '={{ $json.first }} - {{ $json.last }}';
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const issue = ExpressionFormatValidator.validateAndFix(value, 'fullName', context);
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expect(issue).toBeNull();
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});
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});
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describe('Edge cases', () => {
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it('should handle null values', () => {
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const issue = ExpressionFormatValidator.validateAndFix(null, 'field', context);
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expect(issue).toBeNull();
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});
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it('should handle undefined values', () => {
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const issue = ExpressionFormatValidator.validateAndFix(undefined, 'field', context);
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expect(issue).toBeNull();
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});
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it('should handle empty strings', () => {
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const issue = ExpressionFormatValidator.validateAndFix('', 'field', context);
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expect(issue).toBeNull();
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});
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it('should handle numbers', () => {
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const issue = ExpressionFormatValidator.validateAndFix(42, 'field', context);
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expect(issue).toBeNull();
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});
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it('should handle booleans', () => {
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const issue = ExpressionFormatValidator.validateAndFix(true, 'field', context);
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expect(issue).toBeNull();
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});
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it('should handle arrays', () => {
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const issue = ExpressionFormatValidator.validateAndFix(['item1', 'item2'], 'field', context);
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expect(issue).toBeNull();
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});
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});
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});
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describe('validateNodeParameters', () => {
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const context = {
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nodeType: 'n8n-nodes-base.emailSend',
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nodeName: 'Send Email',
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nodeId: 'email-1'
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};
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it('should validate all parameters recursively', () => {
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const parameters = {
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fromEmail: '{{ $env.SENDER_EMAIL }}',
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toEmail: 'user@example.com',
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subject: 'Test {{ $json.type }}',
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body: {
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html: '<p>Hello {{ $json.name }}</p>',
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text: 'Hello {{ $json.name }}'
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},
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options: {
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replyTo: '={{ $env.REPLY_EMAIL }}'
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}
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};
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const issues = ExpressionFormatValidator.validateNodeParameters(parameters, context);
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expect(issues).toHaveLength(4);
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expect(issues.map(i => i.fieldPath)).toContain('fromEmail');
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expect(issues.map(i => i.fieldPath)).toContain('subject');
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expect(issues.map(i => i.fieldPath)).toContain('body.html');
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expect(issues.map(i => i.fieldPath)).toContain('body.text');
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});
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it('should handle arrays with expressions', () => {
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const parameters = {
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recipients: [
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'{{ $json.email1 }}',
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'static@example.com',
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'={{ $json.email2 }}'
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]
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};
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const issues = ExpressionFormatValidator.validateNodeParameters(parameters, context);
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expect(issues).toHaveLength(1);
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expect(issues[0].fieldPath).toBe('recipients[0]');
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expect(issues[0].correctedValue).toBe('={{ $json.email1 }}');
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});
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it('should handle nested objects', () => {
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const parameters = {
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config: {
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database: {
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host: '{{ $env.DB_HOST }}',
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port: 5432,
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name: 'mydb'
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}
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}
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};
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const issues = ExpressionFormatValidator.validateNodeParameters(parameters, context);
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expect(issues).toHaveLength(1);
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expect(issues[0].fieldPath).toBe('config.database.host');
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});
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it('should skip circular references', () => {
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const circular: any = { a: 1 };
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circular.self = circular;
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const parameters = {
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normal: '{{ $json.value }}',
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circular
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};
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const issues = ExpressionFormatValidator.validateNodeParameters(parameters, context);
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// Should only find the issue in 'normal', not crash on circular
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expect(issues).toHaveLength(1);
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expect(issues[0].fieldPath).toBe('normal');
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});
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it('should handle maximum recursion depth', () => {
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// Create a deeply nested object (105 levels deep, exceeding the limit of 100)
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let deepObject: any = { value: '{{ $json.data }}' };
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let current = deepObject;
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for (let i = 0; i < 105; i++) {
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current.nested = { value: `{{ $json.level${i} }}` };
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current = current.nested;
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}
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const parameters = {
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deep: deepObject
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};
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const issues = ExpressionFormatValidator.validateNodeParameters(parameters, context);
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// Should find expression format issues up to the depth limit
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const depthWarning = issues.find(i => i.explanation.includes('Maximum recursion depth'));
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expect(depthWarning).toBeTruthy();
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expect(depthWarning?.severity).toBe('warning');
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// Should still find some expression format errors before hitting the limit
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const formatErrors = issues.filter(i => i.issueType === 'missing-prefix');
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expect(formatErrors.length).toBeGreaterThan(0);
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expect(formatErrors.length).toBeLessThanOrEqual(100); // Should not exceed the depth limit
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});
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});
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describe('formatErrorMessage', () => {
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const context = {
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nodeType: 'n8n-nodes-base.github',
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nodeName: 'Create Issue',
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nodeId: 'github-1'
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};
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it('should format error message for missing prefix', () => {
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const issue = {
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fieldPath: 'title',
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currentValue: '{{ $json.title }}',
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correctedValue: '={{ $json.title }}',
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issueType: 'missing-prefix' as const,
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explanation: "Expression missing required '=' prefix.",
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severity: 'error' as const
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};
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const message = ExpressionFormatValidator.formatErrorMessage(issue, context);
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expect(message).toContain("Expression format error in node 'Create Issue'");
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expect(message).toContain('Field \'title\'');
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expect(message).toContain('Current (incorrect):');
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expect(message).toContain('"title": "{{ $json.title }}"');
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expect(message).toContain('Fixed (correct):');
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expect(message).toContain('"title": "={{ $json.title }}"');
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});
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it('should format error message for resource locator', () => {
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const issue = {
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fieldPath: 'owner',
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currentValue: '{{ $vars.OWNER }}',
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correctedValue: {
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__rl: true,
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value: '={{ $vars.OWNER }}',
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mode: 'expression'
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},
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issueType: 'needs-resource-locator' as const,
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explanation: 'Field needs resource locator format.',
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severity: 'error' as const
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};
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const message = ExpressionFormatValidator.formatErrorMessage(issue, context);
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expect(message).toContain("Expression format error in node 'Create Issue'");
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expect(message).toContain('Current (incorrect):');
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expect(message).toContain('"owner": "{{ $vars.OWNER }}"');
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expect(message).toContain('Fixed (correct):');
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expect(message).toContain('"__rl": true');
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expect(message).toContain('"value": "={{ $vars.OWNER }}"');
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expect(message).toContain('"mode": "expression"');
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});
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});
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describe('Real-world examples', () => {
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it('should validate Email Send node example', () => {
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const context = {
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nodeType: 'n8n-nodes-base.emailSend',
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nodeName: 'Error Handler',
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nodeId: 'b9dd1cfd-ee66-4049-97e7-1af6d976a4e0'
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};
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const parameters = {
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fromEmail: '{{ $env.ADMIN_EMAIL }}',
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toEmail: 'admin@company.com',
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subject: 'GitHub Issue Workflow Error - HIGH PRIORITY',
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options: {}
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};
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const issues = ExpressionFormatValidator.validateNodeParameters(parameters, context);
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expect(issues).toHaveLength(1);
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expect(issues[0].fieldPath).toBe('fromEmail');
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expect(issues[0].correctedValue).toBe('={{ $env.ADMIN_EMAIL }}');
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});
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it('should validate GitHub node example', () => {
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const context = {
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nodeType: 'n8n-nodes-base.github',
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nodeName: 'Send Welcome Comment',
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nodeId: '3c742ca1-af8f-4d80-a47e-e68fb1ced491'
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};
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const parameters = {
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operation: 'createComment',
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owner: '{{ $vars.GITHUB_OWNER }}',
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repository: '{{ $vars.GITHUB_REPO }}',
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issueNumber: null,
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body: '👋 Hi @{{ $(\'Extract Issue Data\').first().json.author }}!\n\nThank you for creating this issue.'
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};
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const issues = ExpressionFormatValidator.validateNodeParameters(parameters, context);
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expect(issues.length).toBeGreaterThan(0);
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expect(issues.some(i => i.fieldPath === 'owner')).toBe(true);
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expect(issues.some(i => i.fieldPath === 'repository')).toBe(true);
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expect(issues.some(i => i.fieldPath === 'body')).toBe(true);
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});
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});
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});
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