yomichan/ext/bg/js/json-schema.js

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/*
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* 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
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* 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;
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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;
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} 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;
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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;
}
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}
}
const additionalItems = schema.additionalItems;
if (additionalItems === false) {
return null;
} else if (JsonSchemaProxyHandler.isObject(additionalItems)) {
if (path !== null) { path.push(['additionalItems', additionalItems]); }
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return additionalItems;
} else {
const result = JsonSchemaProxyHandler._unconstrainedSchema;
if (path !== null) { path.push([null, result]); }
return result;
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}
}
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;
}
}
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return null;
}
if (typeof type === 'undefined') {
if (typeof value !== 'undefined') {
return JsonSchemaProxyHandler.getValueType(value);
}
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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) {
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const ifSchema = schema.if;
if (!JsonSchemaProxyHandler.isObject(ifSchema)) { return; }
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let okay = true;
info.schemaPush('if', ifSchema);
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try {
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JsonSchemaProxyHandler.validate(value, ifSchema, info);
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} catch (e) {
okay = false;
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}
info.schemaPop();
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const nextSchema = okay ? schema.then : schema.else;
if (JsonSchemaProxyHandler.isObject(nextSchema)) {
info.schemaPush(okay ? 'then' : 'else', nextSchema);
JsonSchemaProxyHandler.validate(value, nextSchema, info);
info.schemaPop();
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}
}
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 ${exclusiveMaximum}`, value, schema, info);
}
}
static validateString(value, schema, info) {
const minLength = schema.minLength;
if (typeof minLength === 'number' && value.length < minLength) {
throw new JsonSchemaValidationError('String length too short', value, schema, info);
}
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const maxLength = schema.maxLength;
if (typeof maxLength === 'number' && value.length > maxLength) {
throw new JsonSchemaValidationError('String length too long', value, schema, info);
}
}
static validateArray(value, schema, info) {
const minItems = schema.minItems;
if (typeof minItems === 'number' && value.length < minItems) {
throw new JsonSchemaValidationError('Array length too short', value, schema, info);
}
const maxItems = schema.maxItems;
if (typeof maxItems === 'number' && value.length > maxItems) {
throw new JsonSchemaValidationError('Array length too long', value, schema, info);
}
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for (let i = 0, ii = value.length; i < ii; ++i) {
const schemaPath = [];
const propertySchema = JsonSchemaProxyHandler.getPropertySchema(schema, i, value, schemaPath);
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if (propertySchema === null) {
throw new JsonSchemaValidationError(`No schema found for array[${i}]`, value, schema, info);
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}
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(); }
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}
}
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;
}
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static isObject(value) {
return typeof value === 'object' && value !== null && !Array.isArray(value);
}
}
JsonSchemaProxyHandler._unconstrainedSchema = {};
class JsonSchemaTraversalInfo {
constructor(value, schema) {
this.valuePath = [];
this.schemaPath = [];
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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));
}
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static validate(value, schema) {
return JsonSchemaProxyHandler.validate(value, schema, new JsonSchemaTraversalInfo(value, schema));
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}
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;
}
}