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* @fileoverview State Validation for Coherent.js
* Provides JSON Schema validation and custom validators for state management
* @module @coherent.js/core/state/state-validation
*/
/**
* Email shape check: a local part, then a dotted domain.
*
* Domain labels use `[^\s@.]` rather than `[^\s@]` so that the literal dot
* separators are the only thing that can match a dot. Allowing `[^\s@]+` on
* both sides of `\.` makes the split ambiguous, and a non-matching subject
* with many dots ("a@" + "a." * n + " ") then costs O(n²) backtracking —
* CodeQL js/polynomial-redos.
*
* @private
*/
const EMAIL_PATTERN = /^[^\s@]+@[^\s@.]+(?:\.[^\s@.]+)+$/;
/**
* Longest address RFC 5321 permits, used to bound work before matching.
* @private
*/
const EMAIL_MAX_LENGTH = 254;
/**
* Test whether a value has the shape of an email address.
* @private
* @param {unknown} value - Value to check
* @returns {boolean} True if the value looks like an email address
*/
function isEmailShaped(value) {
return (
typeof value === 'string' &&
value.length <= EMAIL_MAX_LENGTH &&
EMAIL_PATTERN.test(value)
);
}
/**
* @typedef {Object} ValidationOptions
* @property {Object} [schema] - JSON Schema for validation
* @property {Object<string, Function>} [validators] - Custom validator functions
* @property {boolean} [strict=false] - Strict mode (throw on validation errors)
* @property {boolean} [coerce=false] - Coerce types to match schema
* @property {Function} [onError] - Validation error callback
* @property {boolean} [validateOnSet=true] - Validate on state updates
* @property {boolean} [validateOnGet=false] - Validate on state reads
* @property {Array<string>} [required] - Required fields
* @property {boolean} [allowUnknown=true] - Allow unknown properties
*/
/**
* @typedef {Object} ValidationResult
* @property {boolean} valid - Whether validation passed
* @property {Array<ValidationError>} errors - Array of validation errors
* @property {*} value - Validated/coerced value
*/
/**
* @typedef {Object} ValidationError
* @property {string} path - Property path that failed validation
* @property {string} message - Error message
* @property {string} type - Error type
* @property {*} value - The invalid value
* @property {*} expected - Expected value/type
*/
/**
* Whether a value has a JSON Schema type. `object` excludes null and arrays;
* `number` excludes NaN, which JSON cannot represent.
* @private
*/
function matchesType(value, type) {
switch (type) {
case 'array':
return Array.isArray(value);
case 'null':
return value === null;
case 'object':
return value !== null && typeof value === 'object' && !Array.isArray(value);
case 'integer':
return typeof value === 'number' && Number.isInteger(value);
case 'number':
return typeof value === 'number' && !Number.isNaN(value);
default:
return typeof value === type;
}
}
/** @private */
function describeValue(value) {
if (value === null) return 'null';
Iif (Array.isArray(value)) return 'array';
if (typeof value === 'string') return JSON.stringify(value);
return typeof value === 'object' ? 'object' : String(value);
}
/**
* Coerce a value to a JSON Schema type, refusing conversions that would
* invent data: `Boolean('false')` is true, `Number('')` is 0 and
* `String({})` is "[object Object]", so none of those are accepted.
* @private
* @returns {{ ok: boolean, value?: * }}
*/
function coerceTo(value, type) {
switch (type) {
case 'string':
if (typeof value === 'number' || typeof value === 'boolean' || typeof value === 'bigint') {
return { ok: !Number.isNaN(value), value: String(value) };
}
return { ok: false };
case 'number':
case 'integer': {
let number;
if (typeof value === 'string' && value.trim() !== '') {
number = Number(value);
} else Iif (typeof value === 'boolean') {
number = value ? 1 : 0;
} else {
return { ok: false };
}
const valid = type === 'integer' ? Number.isInteger(number) : !Number.isNaN(number);
return valid ? { ok: true, value: number } : { ok: false };
}
case 'boolean':
if (typeof value === 'string') {
const normalized = value.trim().toLowerCase();
if (normalized === 'true' || normalized === '1') return { ok: true, value: true };
if (normalized === 'false' || normalized === '0' || normalized === '') return { ok: true, value: false };
return { ok: false };
}
Eif (value === 1 || value === 0) return { ok: true, value: value === 1 };
return { ok: false };
default:
return { ok: false };
}
}
/**
* Simple JSON Schema validator
*/
class SchemaValidator {
constructor(schema, options = {}) {
this.schema = schema;
this.options = {
coerce: false,
allowUnknown: true,
...options
};
}
/**
* Validate value against schema
* @param {*} value - Value to validate
* @param {Object} schema - Schema to validate against
* @param {string} path - Current path in object
* @returns {ValidationResult} Validation result
*/
validate(value, schema = this.schema, path = '') {
const errors = [];
let coercedValue = value;
// Type validation. A value of the wrong type that could not be coerced
// gets no further checks: they assume the declared type.
Eif (schema.type) {
const typeResult = this.validateType(value, schema.type, path);
if (!typeResult.valid) {
return { valid: false, errors: typeResult.errors, value };
}
coercedValue = typeResult.value;
}
// Enum validation
if (schema.enum) {
const enumResult = this.validateEnum(coercedValue, schema.enum, path);
if (!enumResult.valid) {
errors.push(...enumResult.errors);
}
}
// String validations
if (schema.type === 'string') {
const stringResult = this.validateString(coercedValue, schema, path);
if (!stringResult.valid) {
errors.push(...stringResult.errors);
}
}
// Number validations
if (schema.type === 'number' || schema.type === 'integer') {
const numberResult = this.validateNumber(coercedValue, schema, path);
if (!numberResult.valid) {
errors.push(...numberResult.errors);
}
}
// Array validations
if (schema.type === 'array') {
const arrayResult = this.validateArray(coercedValue, schema, path);
if (!arrayResult.valid) {
errors.push(...arrayResult.errors);
}
coercedValue = arrayResult.value;
}
// Object validations
if (schema.type === 'object') {
const objectResult = this.validateObject(coercedValue, schema, path);
if (!objectResult.valid) {
errors.push(...objectResult.errors);
}
coercedValue = objectResult.value;
}
// Custom validation function
if (schema.validate && typeof schema.validate === 'function') {
const customResult = schema.validate(coercedValue);
if (customResult !== true) {
errors.push({
path,
message: typeof customResult === 'string' ? customResult : 'Custom validation failed',
type: 'custom',
value: coercedValue
});
}
}
return {
valid: errors.length === 0,
errors,
value: coercedValue
};
}
validateType(value, type, path) {
const actualType = Array.isArray(value) ? 'array' : typeof value;
const errors = [];
let coercedValue = value;
// Support array of types
const types = Array.isArray(type) ? type : [type];
const isValid = types.some(t => matchesType(value, t));
if (!isValid) {
if (this.options.coerce) {
// Try to coerce to the first declared type
const primaryType = types[0];
const coerced = coerceTo(value, primaryType);
if (coerced.ok) {
coercedValue = coerced.value;
} else {
errors.push({
path,
message: `Cannot coerce ${describeValue(value)} to ${primaryType}`,
type: 'type',
value,
expected: primaryType
});
}
} else {
errors.push({
path,
message: `Expected type ${types.join(' or ')}, got ${actualType}`,
type: 'type',
value,
expected: type
});
}
}
return {
valid: errors.length === 0,
errors,
value: coercedValue
};
}
validateEnum(value, enumValues, path) {
const errors = [];
if (!enumValues.includes(value)) {
errors.push({
path,
message: `Value must be one of: ${enumValues.join(', ')}`,
type: 'enum',
value,
expected: enumValues
});
}
return { valid: errors.length === 0, errors };
}
validateString(value, schema, path) {
const errors = [];
if (schema.minLength !== undefined && value.length < schema.minLength) {
errors.push({
path,
message: `String length must be >= ${schema.minLength}`,
type: 'minLength',
value
});
}
Iif (schema.maxLength !== undefined && value.length > schema.maxLength) {
errors.push({
path,
message: `String length must be <= ${schema.maxLength}`,
type: 'maxLength',
value
});
}
if (schema.pattern) {
const regex = new RegExp(schema.pattern);
if (!regex.test(value)) {
errors.push({
path,
message: `String does not match pattern: ${schema.pattern}`,
type: 'pattern',
value
});
}
}
if (schema.format) {
const formatResult = this.validateFormat(value, schema.format, path);
if (!formatResult.valid) {
errors.push(...formatResult.errors);
}
}
return { valid: errors.length === 0, errors };
}
validateFormat(value, format, path) {
const errors = [];
const formats = {
email: EMAIL_PATTERN,
url: /^https?:\/\/.+/,
uuid: /^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$/i,
date: /^\d{4}-\d{2}-\d{2}$/,
'date-time': /^\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}/
};
if (formats[format] && !formats[format].test(value)) {
errors.push({
path,
message: `String does not match format: ${format}`,
type: 'format',
value,
expected: format
});
}
return { valid: errors.length === 0, errors };
}
validateNumber(value, schema, path) {
const errors = [];
if (schema.minimum !== undefined && value < schema.minimum) {
errors.push({
path,
message: `Number must be >= ${schema.minimum}`,
type: 'minimum',
value
});
}
if (schema.maximum !== undefined && value > schema.maximum) {
errors.push({
path,
message: `Number must be <= ${schema.maximum}`,
type: 'maximum',
value
});
}
Iif (schema.exclusiveMinimum !== undefined && value <= schema.exclusiveMinimum) {
errors.push({
path,
message: `Number must be > ${schema.exclusiveMinimum}`,
type: 'exclusiveMinimum',
value
});
}
Iif (schema.exclusiveMaximum !== undefined && value >= schema.exclusiveMaximum) {
errors.push({
path,
message: `Number must be < ${schema.exclusiveMaximum}`,
type: 'exclusiveMaximum',
value
});
}
if (schema.multipleOf !== undefined && value % schema.multipleOf !== 0) {
errors.push({
path,
message: `Number must be multiple of ${schema.multipleOf}`,
type: 'multipleOf',
value
});
}
return { valid: errors.length === 0, errors };
}
validateArray(value, schema, path) {
const errors = [];
const coercedValue = [...value];
if (schema.minItems !== undefined && value.length < schema.minItems) {
errors.push({
path,
message: `Array must have at least ${schema.minItems} items`,
type: 'minItems',
value
});
}
Iif (schema.maxItems !== undefined && value.length > schema.maxItems) {
errors.push({
path,
message: `Array must have at most ${schema.maxItems} items`,
type: 'maxItems',
value
});
}
if (schema.uniqueItems) {
const seen = new Set();
const duplicates = [];
value.forEach((item, index) => {
const key = JSON.stringify(item);
if (seen.has(key)) {
duplicates.push(index);
}
seen.add(key);
});
if (duplicates.length > 0) {
errors.push({
path,
message: 'Array items must be unique',
type: 'uniqueItems',
value
});
}
}
// Validate items
Eif (schema.items) {
value.forEach((item, index) => {
const itemPath = `${path}[${index}]`;
const itemResult = this.validate(item, schema.items, itemPath);
Iif (!itemResult.valid) {
errors.push(...itemResult.errors);
}
Iif (this.options.coerce) {
coercedValue[index] = itemResult.value;
}
});
}
return {
valid: errors.length === 0,
errors,
value: coercedValue
};
}
validateObject(value, schema, path) {
const errors = [];
const coercedValue = { ...value };
// Required properties
if (schema.required) {
schema.required.forEach(prop => {
if (!(prop in value)) {
errors.push({
path: path ? `${path}.${prop}` : prop,
message: `Required property "${prop}" is missing`,
type: 'required',
value: undefined
});
}
});
}
// Validate properties
Eif (schema.properties) {
Object.entries(schema.properties).forEach(([prop, propSchema]) => {
if (prop in value) {
const propPath = path ? `${path}.${prop}` : prop;
const propResult = this.validate(value[prop], propSchema, propPath);
if (!propResult.valid) {
errors.push(...propResult.errors);
}
if (this.options.coerce) {
coercedValue[prop] = propResult.value;
}
}
});
}
// Additional properties: rejected by the schema's own
// `additionalProperties: false`, or for any object schema that lists its
// properties when the validator runs with `allowUnknown: false`
if (schema.additionalProperties === false || (!this.options.allowUnknown && schema.properties)) {
const allowedProps = new Set(Object.keys(schema.properties || {}));
Object.keys(value).forEach(prop => {
if (!allowedProps.has(prop)) {
errors.push({
path: path ? `${path}.${prop}` : prop,
message: `Unknown property "${prop}"`,
type: 'additionalProperties',
value: value[prop]
});
}
});
}
// Min/max properties
const propCount = Object.keys(value).length;
Iif (schema.minProperties !== undefined && propCount < schema.minProperties) {
errors.push({
path,
message: `Object must have at least ${schema.minProperties} properties`,
type: 'minProperties',
value
});
}
Iif (schema.maxProperties !== undefined && propCount > schema.maxProperties) {
errors.push({
path,
message: `Object must have at most ${schema.maxProperties} properties`,
type: 'maxProperties',
value
});
}
return {
valid: errors.length === 0,
errors,
value: coercedValue
};
}
}
/**
* Create validated state manager
* @param {Object} initialState - Initial state
* @param {ValidationOptions} options - Validation options
* @returns {Object} Validated state manager
*/
export function createValidatedState(initialState = {}, options = {}) {
const opts = {
schema: null,
validators: {},
strict: false,
coerce: false,
onError: null,
validateOnSet: true,
validateOnGet: false,
required: [],
allowUnknown: true,
...options
};
const schemaValidator = opts.schema ? new SchemaValidator(opts.schema, {
coerce: opts.coerce,
allowUnknown: opts.allowUnknown
}) : null;
let state = { ...initialState };
const listeners = new Set();
const validationErrors = new Map();
/**
* Validate state
* @param {Object} value - State to validate
* @param {string} key - State key (for partial validation)
* @returns {ValidationResult} Validation result
*/
function validateState(value, key = null) {
const errors = [];
let validatedValue = value;
// JSON Schema validation
if (schemaValidator) {
const schema = key && opts.schema.properties
? opts.schema.properties[key]
: opts.schema;
const result = schemaValidator.validate(value, schema, key || '');
if (!result.valid) {
errors.push(...result.errors);
}
validatedValue = result.value;
}
// Custom validators
Iif (key && opts.validators[key]) {
const validator = opts.validators[key];
const result = validator(value);
if (result !== true) {
errors.push({
path: key,
message: typeof result === 'string' ? result : 'Validation failed',
type: 'custom',
value
});
}
} else if (!key) {
// Run custom validators for all fields when validating full state
Object.entries(opts.validators).forEach(([fieldKey, validator]) => {
Eif (fieldKey in value) {
const result = validator(value[fieldKey]);
if (result !== true) {
errors.push({
path: fieldKey,
message: typeof result === 'string' ? result : 'Validation failed',
type: 'custom',
value: value[fieldKey]
});
}
}
});
}
// Required fields
if (opts.required.length > 0 && !key) {
opts.required.forEach(field => {
if (!(field in value)) {
errors.push({
path: field,
message: `Required field "${field}" is missing`,
type: 'required',
value: undefined
});
}
});
}
return {
valid: errors.length === 0,
errors,
value: validatedValue
};
}
/**
* Get state
* @param {string} key - State key
* @returns {*} State value
*/
function getState(key) {
const value = key ? state[key] : { ...state };
Iif (opts.validateOnGet) {
const result = validateState(value, key);
if (!result.valid) {
validationErrors.set(key || '__root__', result.errors);
if (opts.onError) {
opts.onError(result.errors);
}
}
}
return value;
}
/**
* Set state
* @param {Object|Function} updates - State updates
* @throws {Error} If validation fails in strict mode
*/
function setState(updates) {
const oldState = { ...state };
Iif (typeof updates === 'function') {
updates = updates(oldState);
}
// Create the new full state for validation
const newState = { ...state, ...updates };
// Validate before setting
Eif (opts.validateOnSet) {
const result = validateState(newState);
if (!result.valid) {
validationErrors.set('__root__', result.errors);
if (opts.onError) {
opts.onError(result.errors);
}
if (opts.strict) {
const error = new Error('Validation failed');
error.validationErrors = result.errors;
throw error;
}
// Don't update state if validation fails in non-strict mode
return;
}
// Use coerced value if coercion is enabled
if (opts.coerce) {
const updatedKeys = Object.keys(updates);
const newUpdates = {};
updatedKeys.forEach(key => {
Eif (result.value[key] !== state[key]) {
newUpdates[key] = result.value[key];
}
});
updates = newUpdates;
}
// Clear errors on successful validation
validationErrors.clear();
}
state = { ...state, ...updates };
// Notify listeners
listeners.forEach(listener => {
try {
listener(state, oldState);
} catch (error) {
console.error('Listener error:', error);
}
});
}
/**
* Subscribe to state changes
* @param {Function} listener - Change listener
* @returns {Function} Unsubscribe function
*/
function subscribe(listener) {
listeners.add(listener);
return () => listeners.delete(listener);
}
/**
* Get validation errors
* @param {string} key - State key
* @returns {Array<ValidationError>} Validation errors
*/
function getErrors(key = '__root__') {
return validationErrors.get(key) || [];
}
/**
* Check if state is valid
* @returns {boolean} Whether state is valid
*/
function isValid() {
const result = validateState(state);
if (!result.valid) {
validationErrors.set('__root__', result.errors);
}
return result.valid;
}
/**
* Validate specific field
* @param {string} key - Field key
* @param {*} value - Field value
* @returns {ValidationResult} Validation result
*/
function validateField(key, value) {
return validateState(value, key);
}
return {
getState,
setState,
subscribe,
getErrors,
isValid,
validateField,
validate: () => validateState(state)
};
}
/**
* Common validators
*/
export const validators = {
/**
* Email validator
* @param {string} value - Email to validate
* @returns {boolean|string} True if valid, error message otherwise
*/
email: (value) => {
if (typeof value !== 'string') return 'Email must be a string';
if (!isEmailShaped(value)) return 'Invalid email format';
return true;
},
/**
* URL validator
* @param {string} value - URL to validate
* @returns {boolean|string} True if valid, error message otherwise
*/
url: (value) => {
Iif (typeof value !== 'string') return 'URL must be a string';
try {
new URL(value);
return true;
} catch {
return 'Invalid URL format';
}
},
/**
* Range validator
* @param {number} min - Minimum value
* @param {number} max - Maximum value
* @returns {Function} Validator function
*/
range: (min, max) => (value) => {
if (typeof value !== 'number') return 'Value must be a number';
if (value < min || value > max) return `Value must be between ${min} and ${max}`;
return true;
},
/**
* Length validator
* @param {number} min - Minimum length
* @param {number} max - Maximum length
* @returns {Function} Validator function
*/
length: (min, max) => (value) => {
Iif (typeof value !== 'string') return 'Value must be a string';
if (value.length < min || value.length > max) {
return `Length must be between ${min} and ${max}`;
}
return true;
},
/**
* Pattern validator
* @param {RegExp|string} pattern - Pattern to match
* @returns {Function} Validator function
*/
pattern: (pattern) => (value) => {
Iif (typeof value !== 'string') return 'Value must be a string';
const regex = typeof pattern === 'string' ? new RegExp(pattern) : pattern;
if (!regex.test(value)) return `Value does not match pattern: ${pattern}`;
return true;
},
/**
* Required validator
* @param {*} value - Value to validate
* @returns {boolean|string} True if valid, error message otherwise
*/
required: (value) => {
if (value === undefined || value === null || value === '') {
return 'Value is required';
}
return true;
}
};
export default {
createValidatedState,
validators,
SchemaValidator
};
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