mirror of
https://github.com/czlonkowski/n8n-mcp.git
synced 2026-02-09 14:53:07 +00:00
feat: implement webhook path autofixer and improve node similarity service
- Add webhook path auto-generation for nodes missing path configuration - Generates UUID for both 'path' parameter and 'webhookId' field - Conditionally updates typeVersion to 2.1 only when < 2.1 - High confidence fix (95%) as UUID generation is deterministic - Fix critical security and performance issues in NodeSimilarityService: - Replace regex patterns with string-based matching to prevent ReDoS attacks - Add cache invalidation with version tracking to prevent memory leaks - Optimize Levenshtein distance algorithm from O(m*n) space to O(n) - Add early termination for performance improvement - Extract magic numbers into named constants - Add comprehensive documentation for n8n_autofix_workflow tool - Document all fix types including new webhook-missing-path - Include examples, best practices, and warnings - Integrate with MCP tool documentation system - Create node-type-utils for centralized type normalization - Eliminate code duplication across services - Consistent handling of package prefixes 🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <noreply@anthropic.com>
This commit is contained in:
czlonkowski
@@ -19,18 +19,25 @@ export interface SimilarityScore {
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}
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export interface CommonMistakePattern {
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pattern: RegExp | string;
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pattern: string;
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suggestion: string;
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confidence: number;
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reason: string;
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}
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export class NodeSimilarityService {
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// Constants to avoid magic numbers
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private static readonly SCORING_THRESHOLD = 50; // Minimum 50% confidence to suggest
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private static readonly TYPO_EDIT_DISTANCE = 2; // Max 2 character differences for typo detection
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private static readonly SHORT_SEARCH_LENGTH = 5; // Searches ≤5 chars need special handling
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private static readonly CACHE_DURATION_MS = 5 * 60 * 1000; // 5 minutes
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private static readonly AUTO_FIX_CONFIDENCE = 0.9; // 90% confidence for auto-fix
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private repository: NodeRepository;
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private commonMistakes: Map<string, CommonMistakePattern[]>;
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private nodeCache: any[] | null = null;
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private cacheExpiry: number = 0;
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private readonly CACHE_DURATION = 5 * 60 * 1000; // 5 minutes
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private cacheVersion: number = 0; // Track cache version for invalidation
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constructor(repository: NodeRepository) {
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this.repository = repository;
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@@ -39,53 +46,78 @@ export class NodeSimilarityService {
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/**
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* Initialize common mistake patterns
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* Using safer string-based patterns instead of complex regex to avoid ReDoS
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*/
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private initializeCommonMistakes(): Map<string, CommonMistakePattern[]> {
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const patterns = new Map<string, CommonMistakePattern[]>();
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// Case variations
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// Case variations - using exact string matching (case-insensitive)
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patterns.set('case_variations', [
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{ pattern: /^HttpRequest$/i, suggestion: 'nodes-base.httpRequest', confidence: 0.95, reason: 'Incorrect capitalization' },
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{ pattern: /^HTTPRequest$/i, suggestion: 'nodes-base.httpRequest', confidence: 0.95, reason: 'Common capitalization mistake' },
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{ pattern: /^Webhook$/i, suggestion: 'nodes-base.webhook', confidence: 0.95, reason: 'Incorrect capitalization' },
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{ pattern: /^WebHook$/i, suggestion: 'nodes-base.webhook', confidence: 0.95, reason: 'Common capitalization mistake' },
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{ pattern: /^Slack$/i, suggestion: 'nodes-base.slack', confidence: 0.9, reason: 'Missing package prefix' },
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{ pattern: /^Gmail$/i, suggestion: 'nodes-base.gmail', confidence: 0.9, reason: 'Missing package prefix' },
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{ pattern: /^GoogleSheets$/i, suggestion: 'nodes-base.googleSheets', confidence: 0.9, reason: 'Missing package prefix' },
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{ pattern: 'httprequest', suggestion: 'nodes-base.httpRequest', confidence: 0.95, reason: 'Incorrect capitalization' },
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{ pattern: 'webhook', suggestion: 'nodes-base.webhook', confidence: 0.95, reason: 'Incorrect capitalization' },
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{ pattern: 'slack', suggestion: 'nodes-base.slack', confidence: 0.9, reason: 'Missing package prefix' },
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{ pattern: 'gmail', suggestion: 'nodes-base.gmail', confidence: 0.9, reason: 'Missing package prefix' },
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{ pattern: 'googlesheets', suggestion: 'nodes-base.googleSheets', confidence: 0.9, reason: 'Missing package prefix' },
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{ pattern: 'telegram', suggestion: 'nodes-base.telegram', confidence: 0.9, reason: 'Missing package prefix' },
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]);
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// Missing prefixes
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patterns.set('missing_prefix', [
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{ pattern: /^(httpRequest|webhook|slack|gmail|googleSheets|telegram|discord|notion|airtable|postgres|mysql|mongodb)$/i,
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suggestion: '', confidence: 0.9, reason: 'Missing package prefix' },
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// Specific case variations that are common
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patterns.set('specific_variations', [
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{ pattern: 'HttpRequest', suggestion: 'nodes-base.httpRequest', confidence: 0.95, reason: 'Incorrect capitalization' },
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{ pattern: 'HTTPRequest', suggestion: 'nodes-base.httpRequest', confidence: 0.95, reason: 'Common capitalization mistake' },
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{ pattern: 'Webhook', suggestion: 'nodes-base.webhook', confidence: 0.95, reason: 'Incorrect capitalization' },
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{ pattern: 'WebHook', suggestion: 'nodes-base.webhook', confidence: 0.95, reason: 'Common capitalization mistake' },
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]);
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// Old versions or deprecated names
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patterns.set('deprecated', [
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{ pattern: /^n8n-nodes-base\./i, suggestion: '', confidence: 0.95, reason: 'Full package name used instead of short form' },
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{ pattern: /^@n8n\/n8n-nodes-langchain\./i, suggestion: '', confidence: 0.95, reason: 'Full package name used instead of short form' },
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// Deprecated package prefixes
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patterns.set('deprecated_prefixes', [
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{ pattern: 'n8n-nodes-base.', suggestion: 'nodes-base.', confidence: 0.95, reason: 'Full package name used instead of short form' },
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{ pattern: '@n8n/n8n-nodes-langchain.', suggestion: 'nodes-langchain.', confidence: 0.95, reason: 'Full package name used instead of short form' },
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]);
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// Common typos
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// Common typos - exact matches
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patterns.set('typos', [
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{ pattern: /^htpRequest$/i, suggestion: 'nodes-base.httpRequest', confidence: 0.8, reason: 'Likely typo' },
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{ pattern: /^httpReqest$/i, suggestion: 'nodes-base.httpRequest', confidence: 0.8, reason: 'Likely typo' },
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{ pattern: /^webook$/i, suggestion: 'nodes-base.webhook', confidence: 0.8, reason: 'Likely typo' },
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{ pattern: /^slak$/i, suggestion: 'nodes-base.slack', confidence: 0.8, reason: 'Likely typo' },
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{ pattern: /^goggleSheets$/i, suggestion: 'nodes-base.googleSheets', confidence: 0.8, reason: 'Likely typo' },
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{ pattern: 'htprequest', suggestion: 'nodes-base.httpRequest', confidence: 0.8, reason: 'Likely typo' },
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{ pattern: 'httpreqest', suggestion: 'nodes-base.httpRequest', confidence: 0.8, reason: 'Likely typo' },
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{ pattern: 'webook', suggestion: 'nodes-base.webhook', confidence: 0.8, reason: 'Likely typo' },
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{ pattern: 'slak', suggestion: 'nodes-base.slack', confidence: 0.8, reason: 'Likely typo' },
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{ pattern: 'googlesheets', suggestion: 'nodes-base.googleSheets', confidence: 0.8, reason: 'Likely typo' },
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]);
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// AI/LangChain specific
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patterns.set('ai_nodes', [
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{ pattern: /^openai$/i, suggestion: 'nodes-langchain.openAi', confidence: 0.85, reason: 'AI node - incorrect package' },
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{ pattern: /^nodes-base\.openai$/i, suggestion: 'nodes-langchain.openAi', confidence: 0.9, reason: 'Wrong package - OpenAI is in LangChain package' },
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{ pattern: /^chatOpenAI$/i, suggestion: 'nodes-langchain.lmChatOpenAi', confidence: 0.85, reason: 'LangChain node naming convention' },
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{ pattern: /^vectorStore$/i, suggestion: 'nodes-langchain.vectorStoreInMemory', confidence: 0.7, reason: 'Generic vector store reference' },
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{ pattern: 'openai', suggestion: 'nodes-langchain.openAi', confidence: 0.85, reason: 'AI node - incorrect package' },
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{ pattern: 'nodes-base.openai', suggestion: 'nodes-langchain.openAi', confidence: 0.9, reason: 'Wrong package - OpenAI is in LangChain package' },
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{ pattern: 'chatopenai', suggestion: 'nodes-langchain.lmChatOpenAi', confidence: 0.85, reason: 'LangChain node naming convention' },
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{ pattern: 'vectorstore', suggestion: 'nodes-langchain.vectorStoreInMemory', confidence: 0.7, reason: 'Generic vector store reference' },
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]);
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return patterns;
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}
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/**
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* Check if a type is a common node name without prefix
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*/
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private isCommonNodeWithoutPrefix(type: string): string | null {
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const commonNodes: Record<string, string> = {
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'httprequest': 'nodes-base.httpRequest',
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'webhook': 'nodes-base.webhook',
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'slack': 'nodes-base.slack',
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'gmail': 'nodes-base.gmail',
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'googlesheets': 'nodes-base.googleSheets',
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'telegram': 'nodes-base.telegram',
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'discord': 'nodes-base.discord',
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'notion': 'nodes-base.notion',
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'airtable': 'nodes-base.airtable',
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'postgres': 'nodes-base.postgres',
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'mysql': 'nodes-base.mySql',
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'mongodb': 'nodes-base.mongoDb',
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};
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const normalized = type.toLowerCase();
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return commonNodes[normalized] || null;
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}
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/**
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* Find similar nodes for an invalid type
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*/
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@@ -120,7 +152,7 @@ export class NodeSimilarityService {
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continue;
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}
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if (score.totalScore >= 50) {
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if (score.totalScore >= NodeSimilarityService.SCORING_THRESHOLD) {
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suggestions.push(this.createSuggestion(node, score));
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}
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@@ -133,38 +165,65 @@ export class NodeSimilarityService {
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}
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/**
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* Check for common mistake patterns
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* Check for common mistake patterns (ReDoS-safe implementation)
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*/
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private checkCommonMistakes(invalidType: string): NodeSuggestion | null {
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const cleanType = invalidType.trim();
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const lowerType = cleanType.toLowerCase();
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// Check each category of patterns
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// First check for common nodes without prefix
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const commonNodeSuggestion = this.isCommonNodeWithoutPrefix(cleanType);
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if (commonNodeSuggestion) {
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const node = this.repository.getNode(commonNodeSuggestion);
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if (node) {
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return {
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nodeType: commonNodeSuggestion,
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displayName: node.displayName,
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confidence: 0.9,
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reason: 'Missing package prefix',
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category: node.category,
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description: node.description
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};
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}
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}
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// Check deprecated prefixes (string-based, no regex)
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for (const [category, patterns] of this.commonMistakes) {
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for (const pattern of patterns) {
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let match = false;
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let actualSuggestion = pattern.suggestion;
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if (pattern.pattern instanceof RegExp) {
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match = pattern.pattern.test(cleanType);
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} else {
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match = cleanType === pattern.pattern;
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}
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if (match) {
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// Handle dynamic suggestions (e.g., missing prefix)
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if (category === 'missing_prefix' && !actualSuggestion) {
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actualSuggestion = `nodes-base.${cleanType}`;
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} else if (category === 'deprecated' && !actualSuggestion) {
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// Remove package prefix
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actualSuggestion = cleanType.replace(/^n8n-nodes-base\./, 'nodes-base.')
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.replace(/^@n8n\/n8n-nodes-langchain\./, 'nodes-langchain.');
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if (category === 'deprecated_prefixes') {
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for (const pattern of patterns) {
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if (cleanType.startsWith(pattern.pattern)) {
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const actualSuggestion = cleanType.replace(pattern.pattern, pattern.suggestion);
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const node = this.repository.getNode(actualSuggestion);
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if (node) {
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return {
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nodeType: actualSuggestion,
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displayName: node.displayName,
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confidence: pattern.confidence,
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reason: pattern.reason,
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category: node.category,
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description: node.description
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};
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}
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}
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}
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}
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}
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// Verify the suggestion exists
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const node = this.repository.getNode(actualSuggestion);
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// Check exact matches for typos and variations
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for (const [category, patterns] of this.commonMistakes) {
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if (category === 'deprecated_prefixes') continue; // Already handled
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for (const pattern of patterns) {
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// Simple string comparison (case-sensitive for specific_variations)
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const match = category === 'specific_variations'
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? cleanType === pattern.pattern
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: lowerType === pattern.pattern.toLowerCase();
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if (match && pattern.suggestion) {
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const node = this.repository.getNode(pattern.suggestion);
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if (node) {
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return {
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nodeType: actualSuggestion,
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nodeType: pattern.suggestion,
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displayName: node.displayName,
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confidence: pattern.confidence,
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reason: pattern.reason,
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@@ -188,7 +247,7 @@ export class NodeSimilarityService {
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const displayNameClean = this.normalizeNodeType(node.displayName);
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// Special handling for very short search terms (e.g., "http", "sheet")
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const isShortSearch = invalidType.length <= 5;
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const isShortSearch = invalidType.length <= NodeSimilarityService.SHORT_SEARCH_LENGTH;
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// Name similarity (40% weight)
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let nameSimilarity = Math.max(
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@@ -227,10 +286,10 @@ export class NodeSimilarityService {
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// Boost score significantly for short searches that are exact substring matches
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// Short searches need more boost to reach the 50 threshold
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patternMatch = isShortSearch ? 45 : 25;
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} else if (this.getEditDistance(cleanInvalid, cleanValid) <= 2) {
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} else if (this.getEditDistance(cleanInvalid, cleanValid) <= NodeSimilarityService.TYPO_EDIT_DISTANCE) {
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// Small edit distance indicates likely typo
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patternMatch = 20;
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} else if (this.getEditDistance(cleanInvalid, displayNameClean) <= 2) {
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} else if (this.getEditDistance(cleanInvalid, displayNameClean) <= NodeSimilarityService.TYPO_EDIT_DISTANCE) {
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patternMatch = 18;
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}
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@@ -301,41 +360,86 @@ export class NodeSimilarityService {
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}
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/**
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* Calculate Levenshtein distance
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* Calculate Levenshtein distance with optimizations
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* - Early termination when difference exceeds threshold
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* - Space-optimized to use only two rows instead of full matrix
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* - Fast path for identical or vastly different strings
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*/
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private getEditDistance(s1: string, s2: string): number {
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private getEditDistance(s1: string, s2: string, maxDistance: number = 5): number {
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// Fast path: identical strings
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if (s1 === s2) return 0;
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const m = s1.length;
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const n = s2.length;
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const dp: number[][] = Array(m + 1).fill(null).map(() => Array(n + 1).fill(0));
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for (let i = 0; i <= m; i++) dp[i][0] = i;
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for (let j = 0; j <= n; j++) dp[0][j] = j;
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// Fast path: length difference exceeds threshold
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const lengthDiff = Math.abs(m - n);
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if (lengthDiff > maxDistance) return maxDistance + 1;
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// Fast path: empty strings
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if (m === 0) return n;
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if (n === 0) return m;
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// Space optimization: only need previous and current row
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let prev = Array(n + 1).fill(0).map((_, i) => i);
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for (let i = 1; i <= m; i++) {
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const curr = [i];
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let minInRow = i;
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for (let j = 1; j <= n; j++) {
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if (s1[i - 1] === s2[j - 1]) {
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dp[i][j] = dp[i - 1][j - 1];
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} else {
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dp[i][j] = 1 + Math.min(dp[i - 1][j], dp[i][j - 1], dp[i - 1][j - 1]);
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}
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const cost = s1[i - 1] === s2[j - 1] ? 0 : 1;
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const val = Math.min(
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curr[j - 1] + 1, // deletion
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prev[j] + 1, // insertion
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prev[j - 1] + cost // substitution
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);
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curr.push(val);
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minInRow = Math.min(minInRow, val);
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}
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// Early termination: if minimum in this row exceeds threshold
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if (minInRow > maxDistance) {
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return maxDistance + 1;
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}
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prev = curr;
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}
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return dp[m][n];
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return prev[n];
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}
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/**
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* Get cached nodes or fetch from repository
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* Implements proper cache invalidation with version tracking
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*/
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private async getCachedNodes(): Promise<any[]> {
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const now = Date.now();
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if (!this.nodeCache || now > this.cacheExpiry) {
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try {
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this.nodeCache = this.repository.getAllNodes();
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this.cacheExpiry = now + this.CACHE_DURATION;
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const newNodes = this.repository.getAllNodes();
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// Only update cache if we got valid data
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if (newNodes && newNodes.length > 0) {
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this.nodeCache = newNodes;
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this.cacheExpiry = now + NodeSimilarityService.CACHE_DURATION_MS;
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this.cacheVersion++;
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logger.debug('Node cache refreshed', {
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count: newNodes.length,
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version: this.cacheVersion
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});
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} else if (this.nodeCache) {
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// Return stale cache if new fetch returned empty
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logger.warn('Node fetch returned empty, using stale cache');
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}
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} catch (error) {
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logger.error('Failed to fetch nodes for similarity service', error);
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// Return stale cache on error if available
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if (this.nodeCache) {
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logger.info('Using stale cache due to fetch error');
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return this.nodeCache;
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}
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return [];
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}
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}
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@@ -343,6 +447,24 @@ export class NodeSimilarityService {
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return this.nodeCache || [];
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}
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/**
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* Invalidate the cache (e.g., after database updates)
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*/
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public invalidateCache(): void {
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this.nodeCache = null;
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this.cacheExpiry = 0;
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this.cacheVersion++;
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logger.debug('Node cache invalidated', { version: this.cacheVersion });
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}
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/**
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* Clear and refresh cache immediately
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*/
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public async refreshCache(): Promise<void> {
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this.invalidateCache();
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await this.getCachedNodes();
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}
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/**
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* Format suggestions into a user-friendly message
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*/
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@@ -377,14 +499,14 @@ export class NodeSimilarityService {
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* Check if a suggestion is high confidence for auto-fixing
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*/
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isAutoFixable(suggestion: NodeSuggestion): boolean {
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return suggestion.confidence >= 0.9;
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return suggestion.confidence >= NodeSimilarityService.AUTO_FIX_CONFIDENCE;
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}
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/**
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* Clear the node cache (useful after database updates)
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* @deprecated Use invalidateCache() instead for proper version tracking
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*/
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clearCache(): void {
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this.nodeCache = null;
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this.cacheExpiry = 0;
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this.invalidateCache();
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}
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}
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Reference in New Issue
Block a user