/* * Copyright (C) 2019-2020 Alex Yatskov <alex@foosoft.net> * Author: Alex Yatskov <alex@foosoft.net> * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <https://www.gnu.org/licenses/>. */ class JsonSchemaProxyHandler { constructor(schema) { this._schema = schema; } getPrototypeOf(target) { return Object.getPrototypeOf(target); } setPrototypeOf() { throw new Error('setPrototypeOf not supported'); } isExtensible(target) { return Object.isExtensible(target); } preventExtensions(target) { Object.preventExtensions(target); return true; } getOwnPropertyDescriptor(target, property) { return Object.getOwnPropertyDescriptor(target, property); } defineProperty() { throw new Error('defineProperty not supported'); } has(target, property) { return property in target; } get(target, property) { if (typeof property === 'symbol') { return target[property]; } if (Array.isArray(target)) { if (typeof property === 'string' && /^\d+$/.test(property)) { property = parseInt(property, 10); } else if (typeof property === 'string') { return target[property]; } } const propertySchema = JsonSchemaProxyHandler.getPropertySchema(this._schema, property, target); if (propertySchema === null) { return; } const value = target[property]; return value !== null && typeof value === 'object' ? JsonSchema.createProxy(value, propertySchema) : value; } set(target, property, value) { if (Array.isArray(target)) { if (typeof property === 'string' && /^\d+$/.test(property)) { property = parseInt(property, 10); if (property > target.length) { throw new Error('Array index out of range'); } } else if (typeof property === 'string') { target[property] = value; return true; } } const propertySchema = JsonSchemaProxyHandler.getPropertySchema(this._schema, property, target); if (propertySchema === null) { throw new Error(`Property ${property} not supported`); } value = JsonSchema.isolate(value); JsonSchemaProxyHandler.validate(value, propertySchema, new JsonSchemaTraversalInfo(value, propertySchema)); target[property] = value; return true; } deleteProperty(target, property) { const required = this._schema.required; if (Array.isArray(required) && required.includes(property)) { throw new Error(`${property} cannot be deleted`); } return Reflect.deleteProperty(target, property); } ownKeys(target) { return Reflect.ownKeys(target); } apply() { throw new Error('apply not supported'); } construct() { throw new Error('construct not supported'); } static getPropertySchema(schema, property, value, path=null) { const type = JsonSchemaProxyHandler.getSchemaOrValueType(schema, value); switch (type) { case 'object': { const properties = schema.properties; if (JsonSchemaProxyHandler.isObject(properties)) { const propertySchema = properties[property]; if (JsonSchemaProxyHandler.isObject(propertySchema)) { if (path !== null) { path.push(['properties', properties], [property, propertySchema]); } return propertySchema; } } const additionalProperties = schema.additionalProperties; if (additionalProperties === false) { return null; } else if (JsonSchemaProxyHandler.isObject(additionalProperties)) { if (path !== null) { path.push(['additionalProperties', additionalProperties]); } return additionalProperties; } else { const result = JsonSchemaProxyHandler._unconstrainedSchema; if (path !== null) { path.push([null, result]); } return result; } } case 'array': { const items = schema.items; if (JsonSchemaProxyHandler.isObject(items)) { return items; } if (Array.isArray(items)) { if (property >= 0 && property < items.length) { const propertySchema = items[property]; if (JsonSchemaProxyHandler.isObject(propertySchema)) { if (path !== null) { path.push(['items', items], [property, propertySchema]); } return propertySchema; } } } const additionalItems = schema.additionalItems; if (additionalItems === false) { return null; } else if (JsonSchemaProxyHandler.isObject(additionalItems)) { if (path !== null) { path.push(['additionalItems', additionalItems]); } return additionalItems; } else { const result = JsonSchemaProxyHandler._unconstrainedSchema; if (path !== null) { path.push([null, result]); } return result; } } default: return null; } } static getSchemaOrValueType(schema, value) { const type = schema.type; if (Array.isArray(type)) { if (typeof value !== 'undefined') { const valueType = JsonSchemaProxyHandler.getValueType(value); if (type.indexOf(valueType) >= 0) { return valueType; } } return null; } if (typeof type === 'undefined') { if (typeof value !== 'undefined') { return JsonSchemaProxyHandler.getValueType(value); } return null; } return type; } static validate(value, schema, info) { JsonSchemaProxyHandler.validateSingleSchema(value, schema, info); JsonSchemaProxyHandler.validateConditional(value, schema, info); JsonSchemaProxyHandler.validateAllOf(value, schema, info); JsonSchemaProxyHandler.validateAnyOf(value, schema, info); JsonSchemaProxyHandler.validateOneOf(value, schema, info); JsonSchemaProxyHandler.validateNoneOf(value, schema, info); } static validateConditional(value, schema, info) { const ifSchema = schema.if; if (!JsonSchemaProxyHandler.isObject(ifSchema)) { return; } let okay = true; info.schemaPush('if', ifSchema); try { JsonSchemaProxyHandler.validate(value, ifSchema, info); } catch (e) { okay = false; } info.schemaPop(); const nextSchema = okay ? schema.then : schema.else; if (JsonSchemaProxyHandler.isObject(nextSchema)) { info.schemaPush(okay ? 'then' : 'else', nextSchema); JsonSchemaProxyHandler.validate(value, nextSchema, info); info.schemaPop(); } } static validateAllOf(value, schema, info) { const subSchemas = schema.allOf; if (!Array.isArray(subSchemas)) { return; } info.schemaPush('allOf', subSchemas); for (let i = 0; i < subSchemas.length; ++i) { const subSchema = subSchemas[i]; info.schemaPush(i, subSchema); JsonSchemaProxyHandler.validate(value, subSchema, info); info.schemaPop(); } info.schemaPop(); } static validateAnyOf(value, schema, info) { const subSchemas = schema.anyOf; if (!Array.isArray(subSchemas)) { return; } info.schemaPush('anyOf', subSchemas); for (let i = 0; i < subSchemas.length; ++i) { const subSchema = subSchemas[i]; info.schemaPush(i, subSchema); try { JsonSchemaProxyHandler.validate(value, subSchema, info); return; } catch (e) { // NOP } info.schemaPop(); } throw new JsonSchemaValidationError('0 anyOf schemas matched', value, schema, info); // info.schemaPop(); // Unreachable } static validateOneOf(value, schema, info) { const subSchemas = schema.oneOf; if (!Array.isArray(subSchemas)) { return; } info.schemaPush('oneOf', subSchemas); let count = 0; for (let i = 0; i < subSchemas.length; ++i) { const subSchema = subSchemas[i]; info.schemaPush(i, subSchema); try { JsonSchemaProxyHandler.validate(value, subSchema, info); ++count; } catch (e) { // NOP } info.schemaPop(); } if (count !== 1) { throw new JsonSchemaValidationError(`${count} oneOf schemas matched`, value, schema, info); } info.schemaPop(); } static validateNoneOf(value, schema, info) { const subSchemas = schema.not; if (!Array.isArray(subSchemas)) { return; } info.schemaPush('not', subSchemas); for (let i = 0; i < subSchemas.length; ++i) { const subSchema = subSchemas[i]; info.schemaPush(i, subSchema); try { JsonSchemaProxyHandler.validate(value, subSchema, info); } catch (e) { info.schemaPop(); continue; } throw new JsonSchemaValidationError(`not[${i}] schema matched`, value, schema, info); } info.schemaPop(); } static validateSingleSchema(value, schema, info) { const type = JsonSchemaProxyHandler.getValueType(value); const schemaType = schema.type; if (!JsonSchemaProxyHandler.isValueTypeAny(value, type, schemaType)) { throw new JsonSchemaValidationError(`Value type ${type} does not match schema type ${schemaType}`, value, schema, info); } const schemaEnum = schema.enum; if (Array.isArray(schemaEnum) && !JsonSchemaProxyHandler.valuesAreEqualAny(value, schemaEnum)) { throw new JsonSchemaValidationError('Invalid enum value', value, schema, info); } switch (type) { case 'number': JsonSchemaProxyHandler.validateNumber(value, schema, info); break; case 'string': JsonSchemaProxyHandler.validateString(value, schema, info); break; case 'array': JsonSchemaProxyHandler.validateArray(value, schema, info); break; case 'object': JsonSchemaProxyHandler.validateObject(value, schema, info); break; } } static validateNumber(value, schema, info) { const multipleOf = schema.multipleOf; if (typeof multipleOf === 'number' && Math.floor(value / multipleOf) * multipleOf !== value) { throw new JsonSchemaValidationError(`Number is not a multiple of ${multipleOf}`, value, schema, info); } const minimum = schema.minimum; if (typeof minimum === 'number' && value < minimum) { throw new JsonSchemaValidationError(`Number is less than ${minimum}`, value, schema, info); } const exclusiveMinimum = schema.exclusiveMinimum; if (typeof exclusiveMinimum === 'number' && value <= exclusiveMinimum) { throw new JsonSchemaValidationError(`Number is less than or equal to ${exclusiveMinimum}`, value, schema, info); } const maximum = schema.maximum; if (typeof maximum === 'number' && value > maximum) { throw new JsonSchemaValidationError(`Number is greater than ${maximum}`, value, schema, info); } const exclusiveMaximum = schema.exclusiveMaximum; if (typeof exclusiveMaximum === 'number' && value >= exclusiveMaximum) { throw new JsonSchemaValidationError(`Number is greater than or equal to ${exclusiveMaximum}`, value, schema, info); } } static validateString(value, schema, info) { const minLength = schema.minLength; if (typeof minLength === 'number' && value.length < minLength) { throw new JsonSchemaValidationError('String length too short', value, schema, info); } const maxLength = schema.maxLength; if (typeof maxLength === 'number' && value.length > maxLength) { throw new JsonSchemaValidationError('String length too long', value, schema, info); } } static validateArray(value, schema, info) { const minItems = schema.minItems; if (typeof minItems === 'number' && value.length < minItems) { throw new JsonSchemaValidationError('Array length too short', value, schema, info); } const maxItems = schema.maxItems; if (typeof maxItems === 'number' && value.length > maxItems) { throw new JsonSchemaValidationError('Array length too long', value, schema, info); } for (let i = 0, ii = value.length; i < ii; ++i) { const schemaPath = []; const propertySchema = JsonSchemaProxyHandler.getPropertySchema(schema, i, value, schemaPath); if (propertySchema === null) { throw new JsonSchemaValidationError(`No schema found for array[${i}]`, value, schema, info); } const propertyValue = value[i]; for (const [p, s] of schemaPath) { info.schemaPush(p, s); } info.valuePush(i, propertyValue); JsonSchemaProxyHandler.validate(propertyValue, propertySchema, info); info.valuePop(); for (let i = 0; i < schemaPath.length; ++i) { info.schemaPop(); } } } static validateObject(value, schema, info) { const properties = new Set(Object.getOwnPropertyNames(value)); const required = schema.required; if (Array.isArray(required)) { for (const property of required) { if (!properties.has(property)) { throw new JsonSchemaValidationError(`Missing property ${property}`, value, schema, info); } } } const minProperties = schema.minProperties; if (typeof minProperties === 'number' && properties.length < minProperties) { throw new JsonSchemaValidationError('Not enough object properties', value, schema, info); } const maxProperties = schema.maxProperties; if (typeof maxProperties === 'number' && properties.length > maxProperties) { throw new JsonSchemaValidationError('Too many object properties', value, schema, info); } for (const property of properties) { const schemaPath = []; const propertySchema = JsonSchemaProxyHandler.getPropertySchema(schema, property, value, schemaPath); if (propertySchema === null) { throw new JsonSchemaValidationError(`No schema found for ${property}`, value, schema, info); } const propertyValue = value[property]; for (const [p, s] of schemaPath) { info.schemaPush(p, s); } info.valuePush(property, propertyValue); JsonSchemaProxyHandler.validate(propertyValue, propertySchema, info); info.valuePop(); for (let i = 0; i < schemaPath.length; ++i) { info.schemaPop(); } } } static isValueTypeAny(value, type, schemaTypes) { if (typeof schemaTypes === 'string') { return JsonSchemaProxyHandler.isValueType(value, type, schemaTypes); } else if (Array.isArray(schemaTypes)) { for (const schemaType of schemaTypes) { if (JsonSchemaProxyHandler.isValueType(value, type, schemaType)) { return true; } } return false; } return true; } static isValueType(value, type, schemaType) { return ( type === schemaType || (schemaType === 'integer' && Math.floor(value) === value) ); } static getValueType(value) { const type = typeof value; if (type === 'object') { if (value === null) { return 'null'; } if (Array.isArray(value)) { return 'array'; } } return type; } static valuesAreEqualAny(value1, valueList) { for (const value2 of valueList) { if (JsonSchemaProxyHandler.valuesAreEqual(value1, value2)) { return true; } } return false; } static valuesAreEqual(value1, value2) { return value1 === value2; } static getDefaultTypeValue(type) { if (typeof type === 'string') { switch (type) { case 'null': return null; case 'boolean': return false; case 'number': case 'integer': return 0; case 'string': return ''; case 'array': return []; case 'object': return {}; } } return null; } static getValidValueOrDefault(schema, value) { let type = JsonSchemaProxyHandler.getValueType(value); const schemaType = schema.type; if (!JsonSchemaProxyHandler.isValueTypeAny(value, type, schemaType)) { let assignDefault = true; const schemaDefault = schema.default; if (typeof schemaDefault !== 'undefined') { value = JsonSchema.isolate(schemaDefault); type = JsonSchemaProxyHandler.getValueType(value); assignDefault = !JsonSchemaProxyHandler.isValueTypeAny(value, type, schemaType); } if (assignDefault) { value = JsonSchemaProxyHandler.getDefaultTypeValue(schemaType); type = JsonSchemaProxyHandler.getValueType(value); } } switch (type) { case 'object': value = JsonSchemaProxyHandler.populateObjectDefaults(value, schema); break; case 'array': value = JsonSchemaProxyHandler.populateArrayDefaults(value, schema); break; } return value; } static populateObjectDefaults(value, schema) { const properties = new Set(Object.getOwnPropertyNames(value)); const required = schema.required; if (Array.isArray(required)) { for (const property of required) { properties.delete(property); const propertySchema = JsonSchemaProxyHandler.getPropertySchema(schema, property, value); if (propertySchema === null) { continue; } value[property] = JsonSchemaProxyHandler.getValidValueOrDefault(propertySchema, value[property]); } } for (const property of properties) { const propertySchema = JsonSchemaProxyHandler.getPropertySchema(schema, property, value); if (propertySchema === null) { Reflect.deleteProperty(value, property); } else { value[property] = JsonSchemaProxyHandler.getValidValueOrDefault(propertySchema, value[property]); } } return value; } static populateArrayDefaults(value, schema) { for (let i = 0, ii = value.length; i < ii; ++i) { const propertySchema = JsonSchemaProxyHandler.getPropertySchema(schema, i, value); if (propertySchema === null) { continue; } value[i] = JsonSchemaProxyHandler.getValidValueOrDefault(propertySchema, value[i]); } return value; } static isObject(value) { return typeof value === 'object' && value !== null && !Array.isArray(value); } } JsonSchemaProxyHandler._unconstrainedSchema = {}; class JsonSchemaTraversalInfo { constructor(value, schema) { this.valuePath = []; this.schemaPath = []; this.valuePush(null, value); this.schemaPush(null, schema); } valuePush(path, value) { this.valuePath.push([path, value]); } valuePop() { this.valuePath.pop(); } schemaPush(path, schema) { this.schemaPath.push([path, schema]); } schemaPop() { this.schemaPath.pop(); } } class JsonSchemaValidationError extends Error { constructor(message, value, schema, info) { super(message); this.value = value; this.schema = schema; this.info = info; } } class JsonSchema { static createProxy(target, schema) { return new Proxy(target, new JsonSchemaProxyHandler(schema)); } static validate(value, schema) { return JsonSchemaProxyHandler.validate(value, schema, new JsonSchemaTraversalInfo(value, schema)); } static getValidValueOrDefault(schema, value) { return JsonSchemaProxyHandler.getValidValueOrDefault(schema, value); } static isolate(value) { if (value === null) { return null; } switch (typeof value) { case 'boolean': case 'number': case 'string': case 'bigint': case 'symbol': return value; } const stringValue = JSON.stringify(value); return typeof stringValue === 'string' ? JSON.parse(stringValue) : null; } }