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https://github.com/czlonkowski/n8n-mcp.git
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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
340
src/services/expression-format-validator.ts
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340
src/services/expression-format-validator.ts
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/**
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* Expression Format Validator for n8n expressions
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*
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* Combines universal expression validation with node-specific intelligence
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* to provide comprehensive expression format validation. Uses the
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* UniversalExpressionValidator for 100% reliable base validation and adds
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* node-specific resource locator detection on top.
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*/
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import { UniversalExpressionValidator, UniversalValidationResult } from './universal-expression-validator';
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import { ConfidenceScorer } from './confidence-scorer';
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export interface ExpressionFormatIssue {
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fieldPath: string;
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currentValue: any;
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correctedValue: any;
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issueType: 'missing-prefix' | 'needs-resource-locator' | 'invalid-rl-structure' | 'mixed-format';
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explanation: string;
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severity: 'error' | 'warning';
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confidence?: number; // 0.0 to 1.0, only for node-specific recommendations
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}
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export interface ResourceLocatorField {
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__rl: true;
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value: string;
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mode: string;
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}
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export interface ValidationContext {
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nodeType: string;
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nodeName: string;
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nodeId?: string;
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}
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export class ExpressionFormatValidator {
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private static readonly VALID_RL_MODES = ['id', 'url', 'expression', 'name', 'list'] as const;
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private static readonly MAX_RECURSION_DEPTH = 100;
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private static readonly EXPRESSION_PREFIX = '='; // Keep for resource locator generation
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/**
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* Known fields that commonly use resource locator format
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* Map of node type patterns to field names
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*/
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private static readonly RESOURCE_LOCATOR_FIELDS: Record<string, string[]> = {
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'github': ['owner', 'repository', 'user', 'organization'],
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'googleSheets': ['sheetId', 'documentId', 'spreadsheetId', 'rangeDefinition'],
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'googleDrive': ['fileId', 'folderId', 'driveId'],
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'slack': ['channel', 'user', 'channelId', 'userId', 'teamId'],
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'notion': ['databaseId', 'pageId', 'blockId'],
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'airtable': ['baseId', 'tableId', 'viewId'],
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'monday': ['boardId', 'itemId', 'groupId'],
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'hubspot': ['contactId', 'companyId', 'dealId'],
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'salesforce': ['recordId', 'objectName'],
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'jira': ['projectKey', 'issueKey', 'boardId'],
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'gitlab': ['projectId', 'mergeRequestId', 'issueId'],
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'mysql': ['table', 'database', 'schema'],
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'postgres': ['table', 'database', 'schema'],
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'mongodb': ['collection', 'database'],
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's3': ['bucketName', 'key', 'fileName'],
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'ftp': ['path', 'fileName'],
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'ssh': ['path', 'fileName'],
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'redis': ['key'],
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};
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/**
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* Determine if a field should use resource locator format based on node type and field name
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*/
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private static shouldUseResourceLocator(fieldName: string, nodeType: string): boolean {
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// Extract the base node type (e.g., 'github' from 'n8n-nodes-base.github')
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const nodeBase = nodeType.split('.').pop()?.toLowerCase() || '';
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// Check if this node type has resource locator fields
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for (const [pattern, fields] of Object.entries(this.RESOURCE_LOCATOR_FIELDS)) {
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// Use exact match or prefix matching for precision
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// This prevents false positives like 'postgresqlAdvanced' matching 'postgres'
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if ((nodeBase === pattern || nodeBase.startsWith(`${pattern}-`)) && fields.includes(fieldName)) {
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return true;
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}
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}
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// Don't apply resource locator to generic fields
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return false;
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}
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/**
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* Check if a value is a valid resource locator object
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*/
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private static isResourceLocator(value: any): value is ResourceLocatorField {
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if (typeof value !== 'object' || value === null || value.__rl !== true) {
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return false;
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}
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if (!('value' in value) || !('mode' in value)) {
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return false;
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}
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// Validate mode is one of the allowed values
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if (typeof value.mode !== 'string' || !this.VALID_RL_MODES.includes(value.mode as any)) {
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return false;
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}
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return true;
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}
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/**
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* Generate the corrected value for an expression
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*/
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private static generateCorrection(
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value: string,
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needsResourceLocator: boolean
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): any {
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const correctedValue = value.startsWith(this.EXPRESSION_PREFIX)
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? value
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: `${this.EXPRESSION_PREFIX}${value}`;
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if (needsResourceLocator) {
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return {
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__rl: true,
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value: correctedValue,
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mode: 'expression'
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};
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}
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return correctedValue;
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}
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/**
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* Validate and fix expression format for a single value
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*/
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static validateAndFix(
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value: any,
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fieldPath: string,
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context: ValidationContext
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): ExpressionFormatIssue | null {
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// Skip non-string values unless they're resource locators
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if (typeof value !== 'string' && !this.isResourceLocator(value)) {
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return null;
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}
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// Handle resource locator objects
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if (this.isResourceLocator(value)) {
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// Use universal validator for the value inside RL
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const universalResults = UniversalExpressionValidator.validate(value.value);
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const invalidResult = universalResults.find(r => !r.isValid && r.needsPrefix);
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if (invalidResult) {
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return {
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fieldPath,
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currentValue: value,
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correctedValue: {
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...value,
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value: UniversalExpressionValidator.getCorrectedValue(value.value)
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},
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issueType: 'missing-prefix',
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explanation: `Resource locator value: ${invalidResult.explanation}`,
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severity: 'error'
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};
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}
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return null;
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}
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// First, use universal validator for 100% reliable validation
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const universalResults = UniversalExpressionValidator.validate(value);
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const invalidResults = universalResults.filter(r => !r.isValid);
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// If universal validator found issues, report them
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if (invalidResults.length > 0) {
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// Prioritize prefix issues
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const prefixIssue = invalidResults.find(r => r.needsPrefix);
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if (prefixIssue) {
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// Check if this field should use resource locator format with confidence scoring
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const fieldName = fieldPath.split('.').pop() || '';
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const confidenceScore = ConfidenceScorer.scoreResourceLocatorRecommendation(
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fieldName,
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context.nodeType,
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value
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);
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// Only suggest resource locator for high confidence matches when there's a prefix issue
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if (confidenceScore.value >= 0.8) {
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return {
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fieldPath,
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currentValue: value,
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correctedValue: this.generateCorrection(value, true),
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issueType: 'needs-resource-locator',
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explanation: `Field '${fieldName}' contains expression but needs resource locator format with '${this.EXPRESSION_PREFIX}' prefix for evaluation.`,
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severity: 'error',
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confidence: confidenceScore.value
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};
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} else {
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return {
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fieldPath,
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currentValue: value,
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correctedValue: UniversalExpressionValidator.getCorrectedValue(value),
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issueType: 'missing-prefix',
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explanation: prefixIssue.explanation,
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severity: 'error'
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};
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}
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}
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// Report other validation issues
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const firstIssue = invalidResults[0];
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return {
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fieldPath,
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currentValue: value,
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correctedValue: value,
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issueType: 'mixed-format',
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explanation: firstIssue.explanation,
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severity: 'error'
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};
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}
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// Universal validation passed, now check for node-specific improvements
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// Only if the value has expressions
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const hasExpression = universalResults.some(r => r.hasExpression);
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if (hasExpression && typeof value === 'string') {
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const fieldName = fieldPath.split('.').pop() || '';
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const confidenceScore = ConfidenceScorer.scoreResourceLocatorRecommendation(
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fieldName,
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context.nodeType,
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value
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);
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// Only suggest resource locator for medium-high confidence as a warning
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if (confidenceScore.value >= 0.5) {
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// Has prefix but should use resource locator format
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return {
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fieldPath,
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currentValue: value,
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correctedValue: this.generateCorrection(value, true),
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issueType: 'needs-resource-locator',
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explanation: `Field '${fieldName}' should use resource locator format for better compatibility. (Confidence: ${Math.round(confidenceScore.value * 100)}%)`,
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severity: 'warning',
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confidence: confidenceScore.value
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};
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}
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}
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return null;
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}
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/**
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* Validate all expressions in a node's parameters recursively
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*/
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static validateNodeParameters(
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parameters: any,
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context: ValidationContext
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): ExpressionFormatIssue[] {
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const issues: ExpressionFormatIssue[] = [];
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const visited = new WeakSet();
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this.validateRecursive(parameters, '', context, issues, visited);
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return issues;
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}
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/**
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* Recursively validate parameters for expression format issues
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*/
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private static validateRecursive(
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obj: any,
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path: string,
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context: ValidationContext,
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issues: ExpressionFormatIssue[],
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visited: WeakSet<object>,
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depth = 0
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): void {
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// Prevent excessive recursion
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if (depth > this.MAX_RECURSION_DEPTH) {
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issues.push({
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fieldPath: path,
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currentValue: obj,
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correctedValue: obj,
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issueType: 'mixed-format',
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explanation: `Maximum recursion depth (${this.MAX_RECURSION_DEPTH}) exceeded. Object may have circular references or be too deeply nested.`,
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severity: 'warning'
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});
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return;
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}
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// Handle circular references
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if (obj && typeof obj === 'object') {
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if (visited.has(obj)) return;
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visited.add(obj);
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}
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// Check current value
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const issue = this.validateAndFix(obj, path, context);
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if (issue) {
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issues.push(issue);
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}
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// Recurse into objects and arrays
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if (Array.isArray(obj)) {
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obj.forEach((item, index) => {
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const newPath = path ? `${path}[${index}]` : `[${index}]`;
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this.validateRecursive(item, newPath, context, issues, visited, depth + 1);
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});
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} else if (obj && typeof obj === 'object') {
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// Skip resource locator internals if already validated
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if (this.isResourceLocator(obj)) {
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return;
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}
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Object.entries(obj).forEach(([key, value]) => {
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// Skip special keys
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if (key.startsWith('__')) return;
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const newPath = path ? `${path}.${key}` : key;
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this.validateRecursive(value, newPath, context, issues, visited, depth + 1);
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});
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}
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}
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/**
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* Generate a detailed error message with examples
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*/
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static formatErrorMessage(issue: ExpressionFormatIssue, context: ValidationContext): string {
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let message = `Expression format ${issue.severity} in node '${context.nodeName}':\n`;
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message += `Field '${issue.fieldPath}' ${issue.explanation}\n\n`;
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message += `Current (incorrect):\n`;
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if (typeof issue.currentValue === 'string') {
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message += `"${issue.fieldPath}": "${issue.currentValue}"\n\n`;
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} else {
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message += `"${issue.fieldPath}": ${JSON.stringify(issue.currentValue, null, 2)}\n\n`;
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}
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message += `Fixed (correct):\n`;
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if (typeof issue.correctedValue === 'string') {
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message += `"${issue.fieldPath}": "${issue.correctedValue}"`;
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} else {
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message += `"${issue.fieldPath}": ${JSON.stringify(issue.correctedValue, null, 2)}`;
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}
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return message;
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}
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}
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