844 lines
26 KiB
JavaScript
844 lines
26 KiB
JavaScript
/*
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* Copyright (C) 2019-2021 Yomichan Authors
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* 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/>.
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*/
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/* global
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* CacheMap
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*/
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class JsonSchema {
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constructor(schema, rootSchema) {
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this._schema = null;
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this._startSchema = schema;
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this._rootSchema = typeof rootSchema !== 'undefined' ? rootSchema : schema;
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this._regexCache = null;
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this._valueStack = [];
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this._schemaStack = [];
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this._schemaPush(null, null);
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this._valuePush(null, null);
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}
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get schema() {
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return this._startSchema;
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}
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get rootSchema() {
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return this._rootSchema;
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}
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createProxy(value) {
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return (
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typeof value === 'object' && value !== null ?
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new Proxy(value, new JsonSchemaProxyHandler(this)) :
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value
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);
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}
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isValid(value) {
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try {
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this.validate(value);
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return true;
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} catch (e) {
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return false;
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}
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}
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validate(value) {
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this._schemaPush(this._startSchema, null);
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this._valuePush(value, null);
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try {
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this._validate(value);
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} finally {
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this._valuePop();
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this._schemaPop();
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}
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}
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getValidValueOrDefault(value) {
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return this._getValidValueOrDefault(null, value, {schema: this._startSchema, path: null});
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}
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getObjectPropertySchema(property) {
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this._schemaPush(this._startSchema, null);
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try {
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const schemaInfo = this._getObjectPropertySchemaInfo(property);
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return schemaInfo !== null ? new JsonSchema(schemaInfo.schema, this._rootSchema) : null;
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} finally {
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this._schemaPop();
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}
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}
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getArrayItemSchema(index) {
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this._schemaPush(this._startSchema, null);
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try {
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const schemaInfo = this._getArrayItemSchemaInfo(index);
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return schemaInfo !== null ? new JsonSchema(schemaInfo.schema, this._rootSchema) : null;
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} finally {
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this._schemaPop();
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}
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}
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isObjectPropertyRequired(property) {
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const {required} = this._startSchema;
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return Array.isArray(required) && required.includes(property);
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}
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// Stack
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_valuePush(value, path) {
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this._valueStack.push({value, path});
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}
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_valuePop() {
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this._valueStack.pop();
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}
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_schemaPush(schema, path) {
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this._schemaStack.push({schema, path});
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this._schema = schema;
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}
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_schemaPop() {
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this._schemaStack.pop();
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this._schema = this._schemaStack[this._schemaStack.length - 1].schema;
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}
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// Private
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_createError(message) {
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const valueStack = [];
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for (let i = 1, ii = this._valueStack.length; i < ii; ++i) {
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const {value, path} = this._valueStack[i];
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valueStack.push({value, path});
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}
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const schemaStack = [];
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for (let i = 1, ii = this._schemaStack.length; i < ii; ++i) {
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const {schema, path} = this._schemaStack[i];
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schemaStack.push({schema, path});
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}
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const error = new Error(message);
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error.value = valueStack[valueStack.length - 1].value;
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error.schema = this._schema;
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error.valueStack = valueStack;
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error.schemaStack = schemaStack;
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return error;
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}
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_isObject(value) {
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return typeof value === 'object' && value !== null && !Array.isArray(value);
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}
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_getRegex(pattern, flags) {
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if (this._regexCache === null) {
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this._regexCache = new CacheMap(100);
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}
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const key = `${flags}:${pattern}`;
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let regex = this._regexCache.get(key);
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if (typeof regex === 'undefined') {
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regex = new RegExp(pattern, flags);
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this._regexCache.set(key, regex);
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}
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return regex;
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}
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_getUnconstrainedSchema() {
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return {};
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}
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_getObjectPropertySchemaInfo(property) {
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const {properties} = this._schema;
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if (this._isObject(properties)) {
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const propertySchema = properties[property];
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if (this._isObject(propertySchema)) {
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return {schema: propertySchema, path: ['properties', property]};
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}
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}
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const {additionalProperties} = this._schema;
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if (additionalProperties === false) {
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return null;
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} else if (this._isObject(additionalProperties)) {
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return {schema: additionalProperties, path: 'additionalProperties'};
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} else {
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const result = this._getUnconstrainedSchema();
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return {schema: result, path: null};
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}
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}
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_getArrayItemSchemaInfo(index) {
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const {items} = this._schema;
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if (this._isObject(items)) {
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return {schema: items, path: 'items'};
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}
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if (Array.isArray(items)) {
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if (index >= 0 && index < items.length) {
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const propertySchema = items[index];
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if (this._isObject(propertySchema)) {
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return {schema: propertySchema, path: ['items', index]};
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}
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}
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}
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const {additionalItems} = this._schema;
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if (additionalItems === false) {
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return null;
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} else if (this._isObject(additionalItems)) {
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return {schema: additionalItems, path: 'additionalItems'};
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} else {
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const result = this._getUnconstrainedSchema();
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return {schema: result, path: null};
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}
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}
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_getSchemaOrValueType(value) {
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const {type} = this._schema;
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if (Array.isArray(type)) {
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if (typeof value !== 'undefined') {
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const valueType = this._getValueType(value);
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if (type.indexOf(valueType) >= 0) {
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return valueType;
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}
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}
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return null;
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}
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if (typeof type !== 'undefined') { return type; }
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return (typeof value !== 'undefined') ? this._getValueType(value) : null;
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}
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_getValueType(value) {
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const type = typeof value;
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if (type === 'object') {
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if (value === null) { return 'null'; }
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if (Array.isArray(value)) { return 'array'; }
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}
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return type;
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}
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_isValueTypeAny(value, type, schemaTypes) {
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if (typeof schemaTypes === 'string') {
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return this._isValueType(value, type, schemaTypes);
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} else if (Array.isArray(schemaTypes)) {
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for (const schemaType of schemaTypes) {
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if (this._isValueType(value, type, schemaType)) {
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return true;
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}
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}
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return false;
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}
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return true;
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}
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_isValueType(value, type, schemaType) {
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return (
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type === schemaType ||
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(schemaType === 'integer' && Math.floor(value) === value)
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);
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}
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_valuesAreEqualAny(value1, valueList) {
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for (const value2 of valueList) {
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if (this._valuesAreEqual(value1, value2)) {
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return true;
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}
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}
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return false;
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}
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_valuesAreEqual(value1, value2) {
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return value1 === value2;
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}
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// Validation
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_isValidCurrent(value) {
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try {
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this._validate(value);
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return true;
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} catch (e) {
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return false;
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}
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}
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_validate(value) {
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this._validateSingleSchema(value);
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this._validateConditional(value);
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this._validateAllOf(value);
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this._validateAnyOf(value);
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this._validateOneOf(value);
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this._validateNoneOf(value);
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}
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_validateConditional(value) {
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const ifSchema = this._schema.if;
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if (!this._isObject(ifSchema)) { return; }
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let okay = true;
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this._schemaPush(ifSchema, 'if');
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try {
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this._validate(value);
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} catch (e) {
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okay = false;
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} finally {
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this._schemaPop();
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}
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const nextSchema = okay ? this._schema.then : this._schema.else;
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if (this._isObject(nextSchema)) { return; }
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this._schemaPush(nextSchema, okay ? 'then' : 'else');
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try {
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this._validate(value);
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} finally {
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this._schemaPop();
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}
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}
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_validateAllOf(value) {
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const subSchemas = this._schema.allOf;
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if (!Array.isArray(subSchemas)) { return; }
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this._schemaPush(subSchemas, 'allOf');
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try {
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for (let i = 0, ii = subSchemas.length; i < ii; ++i) {
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const subSchema = subSchemas[i];
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if (!this._isObject(subSchema)) { continue; }
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this._schemaPush(subSchema, i);
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try {
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this._validate(value);
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} finally {
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this._schemaPop();
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}
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}
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} finally {
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this._schemaPop();
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}
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}
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_validateAnyOf(value) {
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const subSchemas = this._schema.anyOf;
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if (!Array.isArray(subSchemas)) { return; }
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this._schemaPush(subSchemas, 'anyOf');
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try {
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for (let i = 0, ii = subSchemas.length; i < ii; ++i) {
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const subSchema = subSchemas[i];
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if (!this._isObject(subSchema)) { continue; }
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this._schemaPush(subSchema, i);
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try {
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this._validate(value);
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return;
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} catch (e) {
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// NOP
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} finally {
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this._schemaPop();
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}
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}
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throw this._createError('0 anyOf schemas matched');
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} finally {
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this._schemaPop();
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}
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}
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_validateOneOf(value) {
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const subSchemas = this._schema.oneOf;
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if (!Array.isArray(subSchemas)) { return; }
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this._schemaPush(subSchemas, 'oneOf');
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try {
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let count = 0;
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for (let i = 0, ii = subSchemas.length; i < ii; ++i) {
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const subSchema = subSchemas[i];
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if (!this._isObject(subSchema)) { continue; }
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this._schemaPush(subSchema, i);
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try {
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this._validate(value);
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++count;
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} catch (e) {
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// NOP
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} finally {
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this._schemaPop();
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}
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}
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if (count !== 1) {
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throw this._createError(`${count} oneOf schemas matched`);
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}
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} finally {
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this._schemaPop();
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}
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}
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_validateNoneOf(value) {
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const subSchemas = this._schema.not;
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if (!Array.isArray(subSchemas)) { return; }
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this._schemaPush(subSchemas, 'not');
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try {
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for (let i = 0, ii = subSchemas.length; i < ii; ++i) {
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const subSchema = subSchemas[i];
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if (!this._isObject(subSchema)) { continue; }
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this._schemaPush(subSchema, i);
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try {
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this._validate(value);
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} catch (e) {
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continue;
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} finally {
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this._schemaPop();
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}
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throw this._createError(`not[${i}] schema matched`);
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}
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} finally {
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this._schemaPop();
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}
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}
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_validateSingleSchema(value) {
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const type = this._getValueType(value);
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const schemaType = this._schema.type;
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if (!this._isValueTypeAny(value, type, schemaType)) {
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throw this._createError(`Value type ${type} does not match schema type ${schemaType}`);
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}
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const schemaConst = this._schema.const;
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if (typeof schemaConst !== 'undefined' && !this._valuesAreEqual(value, schemaConst)) {
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throw this._createError('Invalid constant value');
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}
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const schemaEnum = this._schema.enum;
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if (Array.isArray(schemaEnum) && !this._valuesAreEqualAny(value, schemaEnum)) {
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throw this._createError('Invalid enum value');
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}
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switch (type) {
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case 'number':
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this._validateNumber(value);
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break;
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case 'string':
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this._validateString(value);
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break;
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case 'array':
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this._validateArray(value);
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break;
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case 'object':
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this._validateObject(value);
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break;
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}
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}
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_validateNumber(value) {
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const {multipleOf} = this._schema;
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if (typeof multipleOf === 'number' && Math.floor(value / multipleOf) * multipleOf !== value) {
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throw this._createError(`Number is not a multiple of ${multipleOf}`);
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}
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const {minimum} = this._schema;
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if (typeof minimum === 'number' && value < minimum) {
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throw this._createError(`Number is less than ${minimum}`);
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}
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const {exclusiveMinimum} = this._schema;
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if (typeof exclusiveMinimum === 'number' && value <= exclusiveMinimum) {
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throw this._createError(`Number is less than or equal to ${exclusiveMinimum}`);
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}
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const {maximum} = this._schema;
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if (typeof maximum === 'number' && value > maximum) {
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throw this._createError(`Number is greater than ${maximum}`);
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}
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const {exclusiveMaximum} = this._schema;
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if (typeof exclusiveMaximum === 'number' && value >= exclusiveMaximum) {
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throw this._createError(`Number is greater than or equal to ${exclusiveMaximum}`);
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}
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}
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_validateString(value) {
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const {minLength} = this._schema;
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if (typeof minLength === 'number' && value.length < minLength) {
|
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throw this._createError('String length too short');
|
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}
|
|
|
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const {maxLength} = this._schema;
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if (typeof maxLength === 'number' && value.length > maxLength) {
|
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throw this._createError('String length too long');
|
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}
|
|
|
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const {pattern} = this._schema;
|
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if (typeof pattern === 'string') {
|
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let {patternFlags} = this._schema;
|
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if (typeof patternFlags !== 'string') { patternFlags = ''; }
|
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|
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let regex;
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try {
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regex = this._getRegex(pattern, patternFlags);
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} catch (e) {
|
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throw this._createError(`Pattern is invalid (${e.message})`);
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}
|
|
|
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if (!regex.test(value)) {
|
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throw this._createError('Pattern match failed');
|
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}
|
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}
|
|
}
|
|
|
|
_validateArray(value) {
|
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const {length} = value;
|
|
|
|
const {minItems} = this._schema;
|
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if (typeof minItems === 'number' && length < minItems) {
|
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throw this._createError('Array length too short');
|
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}
|
|
|
|
const {maxItems} = this._schema;
|
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if (typeof maxItems === 'number' && length > maxItems) {
|
|
throw this._createError('Array length too long');
|
|
}
|
|
|
|
this._validateArrayContains(value);
|
|
|
|
for (let i = 0; i < length; ++i) {
|
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const schemaInfo = this._getArrayItemSchemaInfo(i);
|
|
if (schemaInfo === null) {
|
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throw this._createError(`No schema found for array[${i}]`);
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}
|
|
|
|
const propertyValue = value[i];
|
|
|
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this._schemaPush(schemaInfo.schema, schemaInfo.path);
|
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this._valuePush(propertyValue, i);
|
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try {
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this._validate(propertyValue);
|
|
} finally {
|
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this._valuePop();
|
|
this._schemaPop();
|
|
}
|
|
}
|
|
}
|
|
|
|
_validateArrayContains(value) {
|
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const containsSchema = this._schema.contains;
|
|
if (!this._isObject(containsSchema)) { return; }
|
|
|
|
this._schemaPush(containsSchema, 'contains');
|
|
try {
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for (let i = 0, ii = value.length; i < ii; ++i) {
|
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const propertyValue = value[i];
|
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this._valuePush(propertyValue, i);
|
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try {
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this._validate(propertyValue);
|
|
return;
|
|
} catch (e) {
|
|
// NOP
|
|
} finally {
|
|
this._valuePop();
|
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}
|
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}
|
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throw this._createError('contains schema didn\'t match');
|
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} finally {
|
|
this._schemaPop();
|
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}
|
|
}
|
|
|
|
_validateObject(value) {
|
|
const properties = new Set(Object.getOwnPropertyNames(value));
|
|
|
|
const {required} = this._schema;
|
|
if (Array.isArray(required)) {
|
|
for (const property of required) {
|
|
if (!properties.has(property)) {
|
|
throw this._createError(`Missing property ${property}`);
|
|
}
|
|
}
|
|
}
|
|
|
|
const {minProperties} = this._schema;
|
|
if (typeof minProperties === 'number' && properties.length < minProperties) {
|
|
throw this._createError('Not enough object properties');
|
|
}
|
|
|
|
const {maxProperties} = this._schema;
|
|
if (typeof maxProperties === 'number' && properties.length > maxProperties) {
|
|
throw this._createError('Too many object properties');
|
|
}
|
|
|
|
for (const property of properties) {
|
|
const schemaInfo = this._getObjectPropertySchemaInfo(property);
|
|
if (schemaInfo === null) {
|
|
throw this._createError(`No schema found for ${property}`);
|
|
}
|
|
|
|
const propertyValue = value[property];
|
|
|
|
this._schemaPush(schemaInfo.schema, schemaInfo.path);
|
|
this._valuePush(propertyValue, property);
|
|
try {
|
|
this._validate(propertyValue);
|
|
} finally {
|
|
this._valuePop();
|
|
this._schemaPop();
|
|
}
|
|
}
|
|
}
|
|
|
|
// Creation
|
|
|
|
_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;
|
|
}
|
|
|
|
_getDefaultSchemaValue() {
|
|
const {type: schemaType, default: schemaDefault} = this._schema;
|
|
return (
|
|
typeof schemaDefault !== 'undefined' &&
|
|
this._isValueTypeAny(schemaDefault, this._getValueType(schemaDefault), schemaType) ?
|
|
clone(schemaDefault) :
|
|
this._getDefaultTypeValue(schemaType)
|
|
);
|
|
}
|
|
|
|
_getValidValueOrDefault(path, value, schemaInfo) {
|
|
this._schemaPush(schemaInfo.schema, schemaInfo.path);
|
|
this._valuePush(value, path);
|
|
try {
|
|
return this._getValidValueOrDefaultInner(value);
|
|
} finally {
|
|
this._valuePop();
|
|
this._schemaPop();
|
|
}
|
|
}
|
|
|
|
_getValidValueOrDefaultInner(value) {
|
|
let type = this._getValueType(value);
|
|
if (typeof value === 'undefined' || !this._isValueTypeAny(value, type, this._schema.type)) {
|
|
value = this._getDefaultSchemaValue();
|
|
type = this._getValueType(value);
|
|
}
|
|
|
|
switch (type) {
|
|
case 'object':
|
|
value = this._populateObjectDefaults(value);
|
|
break;
|
|
case 'array':
|
|
value = this._populateArrayDefaults(value);
|
|
break;
|
|
default:
|
|
if (!this._isValidCurrent(value)) {
|
|
const schemaDefault = this._getDefaultSchemaValue();
|
|
if (this._isValidCurrent(schemaDefault)) {
|
|
value = schemaDefault;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
|
|
return value;
|
|
}
|
|
|
|
_populateObjectDefaults(value) {
|
|
const properties = new Set(Object.getOwnPropertyNames(value));
|
|
|
|
const {required} = this._schema;
|
|
if (Array.isArray(required)) {
|
|
for (const property of required) {
|
|
properties.delete(property);
|
|
const schemaInfo = this._getObjectPropertySchemaInfo(property);
|
|
if (schemaInfo === null) { continue; }
|
|
const propertyValue = Object.prototype.hasOwnProperty.call(value, property) ? value[property] : void 0;
|
|
value[property] = this._getValidValueOrDefault(property, propertyValue, schemaInfo);
|
|
}
|
|
}
|
|
|
|
for (const property of properties) {
|
|
const schemaInfo = this._getObjectPropertySchemaInfo(property);
|
|
if (schemaInfo === null) {
|
|
Reflect.deleteProperty(value, property);
|
|
} else {
|
|
value[property] = this._getValidValueOrDefault(property, value[property], schemaInfo);
|
|
}
|
|
}
|
|
|
|
return value;
|
|
}
|
|
|
|
_populateArrayDefaults(value) {
|
|
for (let i = 0, ii = value.length; i < ii; ++i) {
|
|
const schemaInfo = this._getArrayItemSchemaInfo(i);
|
|
if (schemaInfo === null) { continue; }
|
|
const propertyValue = value[i];
|
|
value[i] = this._getValidValueOrDefault(i, propertyValue, schemaInfo);
|
|
}
|
|
|
|
const {minItems, maxItems} = this._schema;
|
|
if (typeof minItems === 'number' && value.length < minItems) {
|
|
for (let i = value.length; i < minItems; ++i) {
|
|
const schemaInfo = this._getArrayItemSchemaInfo(i);
|
|
if (schemaInfo === null) { break; }
|
|
const item = this._getValidValueOrDefault(i, void 0, schemaInfo);
|
|
value.push(item);
|
|
}
|
|
}
|
|
|
|
if (typeof maxItems === 'number' && value.length > maxItems) {
|
|
value.splice(maxItems, value.length - maxItems);
|
|
}
|
|
|
|
return value;
|
|
}
|
|
}
|
|
|
|
class JsonSchemaProxyHandler {
|
|
constructor(schema) {
|
|
this._schema = schema;
|
|
this._numberPattern = /^(?:0|[1-9]\d*)$/;
|
|
}
|
|
|
|
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]; }
|
|
|
|
let propertySchema;
|
|
if (Array.isArray(target)) {
|
|
property = this._getArrayIndex(property);
|
|
if (property === null) {
|
|
// Note: this does not currently wrap mutating functions like push, pop, shift, unshift, splice
|
|
return target[property];
|
|
}
|
|
propertySchema = this._schema.getArrayItemSchema(property);
|
|
} else {
|
|
propertySchema = this._schema.getObjectPropertySchema(property);
|
|
}
|
|
|
|
if (propertySchema === null) { return void 0; }
|
|
|
|
const value = target[property];
|
|
return value !== null && typeof value === 'object' ? propertySchema.createProxy(value) : value;
|
|
}
|
|
|
|
set(target, property, value) {
|
|
if (typeof property === 'symbol') { throw new Error(`Cannot assign symbol property ${property}`); }
|
|
|
|
let propertySchema;
|
|
if (Array.isArray(target)) {
|
|
property = this._getArrayIndex(property);
|
|
if (property === null) { throw new Error(`Property ${property} cannot be assigned to array`); }
|
|
if (property > target.length) { throw new Error('Array index out of range'); }
|
|
propertySchema = this._schema.getArrayItemSchema(property);
|
|
} else {
|
|
propertySchema = this._schema.getObjectPropertySchema(property);
|
|
}
|
|
|
|
if (propertySchema === null) { throw new Error(`Property ${property} not supported`); }
|
|
|
|
value = clone(value);
|
|
propertySchema.validate(value);
|
|
|
|
target[property] = value;
|
|
return true;
|
|
}
|
|
|
|
deleteProperty(target, property) {
|
|
const required = (
|
|
(typeof target === 'object' && target !== null) ?
|
|
(Array.isArray(target) || this._schema.isObjectPropertyRequired(property)) :
|
|
true
|
|
);
|
|
if (required) {
|
|
throw new Error(`${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');
|
|
}
|
|
|
|
// Private
|
|
|
|
_getArrayIndex(property) {
|
|
if (typeof property === 'string' && this._numberPattern.test(property)) {
|
|
return Number.parseInt(property, 10);
|
|
} else if (typeof property === 'number' && Math.floor(property) === property && property >= 0) {
|
|
return property;
|
|
} else {
|
|
return null;
|
|
}
|
|
}
|
|
}
|