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* API Validation for Coherent.js
* @fileoverview Schema-based validation utilities
*/
import { ValidationError } from './errors.js';
/**
* Validate data against a schema
* @param {Object} schema - JSON Schema
* @param {any} data - Data to validate
* @returns {Object} Validation result
*/
function validateAgainstSchema(schema, data) {
const errors = [];
// Simple validation implementation
// In a real implementation, this would use a proper JSON Schema validator
if (schema.type === 'object') {
if (typeof data !== 'object' || data === null || Array.isArray(data)) {
errors.push({
field: '',
message: `Expected object, got ${typeof data}`
});
return { valid: false, errors };
}
// Check required fields
if (schema.required && Array.isArray(schema.required)) {
for (const field of schema.required) {
if (!(field in data)) {
errors.push({
field,
message: `Required field '${field}' is missing`
});
}
}
}
// Validate properties
if (schema.properties) {
for (const [field, fieldSchema] of Object.entries(schema.properties)) {
if (field in data) {
const fieldValue = data[field];
const fieldErrors = validateField(fieldSchema, fieldValue, field);
errors.push(...fieldErrors);
}
}
}
}
return {
valid: errors.length === 0,
errors
};
}
/**
* Validate a single field
* @param {Object} schema - Field schema
* @param {any} value - Field value
* @param {string} fieldName - Field name
* @returns {Array} Validation errors
*/
function validateField(schema, value, fieldName) {
const errors = [];
// Type validation
if (schema.type) {
if (schema.type === 'string' && typeof value !== 'string') {
errors.push({
field: fieldName,
message: `Expected string, got ${typeof value}`
});
} else if (schema.type === 'number' && typeof value !== 'number') {
errors.push({
field: fieldName,
message: `Expected number, got ${typeof value}`
});
} else if (schema.type === 'boolean' && typeof value !== 'boolean') {
errors.push({
field: fieldName,
message: `Expected boolean, got ${typeof value}`
});
} else if (schema.type === 'array' && !Array.isArray(value)) {
errors.push({
field: fieldName,
message: `Expected array, got ${typeof value}`
});
}
}
// String-specific validations
if (schema.type === 'string') {
if (schema.minLength && value.length < schema.minLength) {
errors.push({
field: fieldName,
message: `String must be at least ${schema.minLength} characters`
});
}
if (schema.maxLength && value.length > schema.maxLength) {
errors.push({
field: fieldName,
message: `String must be at most ${schema.maxLength} characters`
});
}
if (schema.format === 'email' && !/^[^@]+@[^@]+\.[^@]+$/.test(value)) {
errors.push({
field: fieldName,
message: 'Invalid email format'
});
}
}
// Number-specific validations
if (schema.type === 'number') {
if (schema.minimum !== undefined && value < schema.minimum) {
errors.push({
field: fieldName,
message: `Number must be at least ${schema.minimum}`
});
}
if (schema.maximum !== undefined && value > schema.maximum) {
errors.push({
field: fieldName,
message: `Number must be at most ${schema.maximum}`
});
}
}
return errors;
}
/**
* Create validation middleware
* @param {Object} schema - JSON Schema for validation
* @returns {Function} Middleware function
*/
function withValidation(schema) {
return (req, res, next) => {
const data = req.body || {};
const result = validateAgainstSchema(schema, data);
if (!result.valid) {
throw new ValidationError(result.errors);
}
next();
};
}
/**
* Validate query parameters
* @param {Object} schema - JSON Schema for query parameters
* @returns {Function} Middleware function
*/
function withQueryValidation(schema) {
return (req, res, next) => {
const data = req.query || {};
const result = validateAgainstSchema(schema, data);
if (!result.valid) {
throw new ValidationError(result.errors);
}
next();
};
}
/**
* Validate path parameters
* @param {Object} schema - JSON Schema for path parameters
* @returns {Function} Middleware function
*/
function withParamsValidation(schema) {
return (req, res, next) => {
const data = req.params || {};
const result = validateAgainstSchema(schema, data);
if (!result.valid) {
throw new ValidationError(result.errors);
}
next();
};
}
// Export validation utilities
export {
validateAgainstSchema,
validateField,
withValidation,
withQueryValidation,
withParamsValidation
};
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