105 lines
2.8 KiB
JavaScript
105 lines
2.8 KiB
JavaScript
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/**
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* Centralized Error Formatter Middleware
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*
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* Standard error response format:
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* {
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* "error": "ValidationError",
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* "message": "Human-readable description",
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* "field": "optional-field-name",
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* "code": "machine-readable-code"
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* }
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*/
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const { ValidationError, formatError } = require('../utils/apiError');
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/**
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* Extract field name from various validation error patterns
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*/
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function extractFieldFromError(message) {
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if (!message) return null;
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// Patterns like "field must be ..." or "field is ..."
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const fieldMatch = message.match(/^(\w+)\s+(?:must be|is|are)\s+/i);
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if (fieldMatch) return fieldMatch[1];
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// Patterns like "year must be..." or "month must be..."
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const yearMonthMatch = message.match(/^(year|month|due_day|interest_rate|actual_amount|start_year|start_month|end_year|end_month)\s+must\b/i);
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if (yearMonthMatch) return yearMonthMatch[1];
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// Patterns like "name is required"
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const requiredMatch = message.match(/^(username|password|name|bill_id|category_id|due_day)\s+(?:is|are)\s+required/i);
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if (requiredMatch) return requiredMatch[1];
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return null;
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}
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/**
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* Convert a plain error message/string into a standardized error object
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*/
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function standardizeError(message, code = 'VALIDATION_ERROR', fieldOverride = null) {
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const field = fieldOverride || extractFieldFromError(message);
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return {
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error: code,
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message: typeof message === 'string' ? message : String(message),
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field: field || null,
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code: code
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};
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}
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/**
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* Express middleware that ensures all error responses follow standard format
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*/
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function errorFormatter(req, res, next) {
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const originalJson = res.json;
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res.json = function(data) {
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// If data is an error object (has error property), standardize it
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if (data && typeof data === 'object' && data.error && !data.success) {
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const standardized = standardizeError(data.error, data.error || 'ERROR', data.field);
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return originalJson.call(this, standardized);
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}
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return originalJson.call(this, data);
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};
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next();
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}
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/**
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* Helper to format validation errors with proper field extraction
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*/
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function formatValidationError(message, field) {
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return standardizeError(message, 'VALIDATION_ERROR', field);
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}
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/**
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* Helper to format not found errors
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*/
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function formatNotFoundError(message, field) {
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return standardizeError(message, 'NOT_FOUND', field);
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}
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/**
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* Helper to format authentication errors
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*/
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function formatAuthError(message) {
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return standardizeError(message, 'AUTH_ERROR');
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}
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/**
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* Helper to format forbidden/access errors
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*/
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function formatForbiddenError(message) {
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return standardizeError(message, 'FORBIDDEN');
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}
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module.exports = {
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errorFormatter,
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standardizeError,
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formatValidationError,
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formatNotFoundError,
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formatAuthError,
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formatForbiddenError,
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extractFieldFromError,
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};
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