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const Ajv = require( 'ajv' ).default;
const fs = require( 'fs' );
const path = require( 'path' );
const { findIdentity, getError, isMemberOfDangerTrio, isVoid, isBuiltInType, convertZListToItemArray, ZObjectKeyFactory } = require( './utils.js' );
const { readYaml } = require( './fileUtils.js' );
const { ValidationStatus } = require( './validationStatus.js' );
const SCHEMA_NAME_REGEX = '(Z[1-9]\\d*(K[1-9]\\d*)?|LIST|RESOLVER|GENERIC)';
let Z1Validator, Z4Validator, Z5Validator, Z6Validator, Z7Validator,
Z9Validator, Z18Validator, Z40Validator, Z99Validator;
function initializeValidators() {
// eslint-disable-next-line no-use-before-define
const defaultFactory = SchemaFactory.NORMAL();
Z1Validator = defaultFactory.create( 'Z1' );
Z4Validator = defaultFactory.create( 'Z4_literal' );
Z5Validator = defaultFactory.create( 'Z5_literal' );
Z6Validator = defaultFactory.create( 'Z6_literal' );
Z7Validator = defaultFactory.create( 'Z7_literal' );
Z9Validator = defaultFactory.create( 'Z9_literal' );
Z18Validator = defaultFactory.create( 'Z18_literal' );
Z40Validator = defaultFactory.create( 'Z40_literal' );
Z99Validator = defaultFactory.create( 'Z99_literal' );
}
function newAjv() {
return new Ajv( {
allowMatchingProperties: true,
verbose: true,
strictTuples: false,
strictTypes: false } );
}
// TODO (T296659): Migrate validatesAs* functions to utils. Somehow avoid
// incurring circular import problem in the process.
/**
* Determines whether argument is a valid ZObject.
*
* @param {Object} Z1 object to be validated
* @return {ValidationStatus} Status is only valid if Z1 validates as a Z1
*/
function validatesAsZObject( Z1 ) {
return Z1Validator.validateStatus( Z1 );
}
/**
* Determines whether argument is a Z4.
*
* @param {Object} Z1 a ZObject
* @return {ValidationStatus} Status is only valid if Z1 validates as Z4
*/
function validatesAsType( Z1 ) {
return Z4Validator.validateStatus( Z1 );
}
/**
* Determines whether argument is a Z5.
*
* @param {Object} Z1 a ZObject
* @return {ValidationStatus} Status is only valid if Z1 validates as Z5
*/
function validatesAsError( Z1 ) {
return Z5Validator.validateStatus( Z1 );
}
/**
* Determines whether argument is a Z6 or Z9. These two types' Z1K1s are
* strings instead of Z9s, so some checks below need to special-case their
* logic.
*
* @param {Object} Z1 a ZObject
* @return {ValidationStatus} Status is only valid if Z1 validates as either Z6 or Z7
*/
function validatesAsString( Z1 ) {
return Z6Validator.validateStatus( Z1 );
}
/**
* Determines whether argument is a Z9.
*
* @param {Object} Z1 a ZObject
* @return {ValidationStatus} Status is only valid if Z1 validates as Z9
*/
function validatesAsReference( Z1 ) {
return Z9Validator.validateStatus( Z1 );
}
/**
* Validates a ZObject against the Function Call schema.
*
* @param {Object} Z1 object to be validated
* @return {ValidationStatus} whether Z1 can validated as a Function Call
*/
function validatesAsFunctionCall( Z1 ) {
return Z7Validator.validateStatus( Z1 );
}
/**
* Validates a ZObject against the Argument Reference schema.
*
* @param {Object} Z1 object to be validated
* @return {ValidationStatus} whether Z1 can validated as an Argument Reference
*/
function validatesAsArgumentReference( Z1 ) {
return Z18Validator.validateStatus( Z1 );
}
/**
* Validates a ZObject against the Quote schema.
*
* @param {Object} Z1 object to be validated
* @return {ValidationStatus} whether Z1 can validated as a Quote
*/
function validatesAsQuote( Z1 ) {
return Z99Validator.validateStatus( Z1 );
}
/**
* Validates a ZObject against the Boolean schema.
*
* @param {Object} Z1 object to be validated
* @return {ValidationStatus} whether Z1 can validated as a Boolean
*/
function validatesAsBoolean( Z1 ) {
return Z40Validator.validateStatus( Z1 );
}
class BaseSchema {
constructor() {
this.keyMap_ = new Map();
}
/**
* Validate a JSON object using validateStatus method; return only whether
* the result was valid without surfacing errors.
*
* @param {Object} maybeValid a JSON object
* @return {ValidationStatus} whether the object is valid
*/
validate( maybeValid ) {
return this.validateStatus( maybeValid ).isValid();
}
/**
* @param {string} key
* @return {Schema} a schema for a sub part of the main schema.
*/
subValidator( key ) {
return this.keyMap_.get( key );
}
/**
* @return {Array<string>} All the available subvalidators' keys.
*/
subValidatorKeys() {
return Array.from( this.keyMap_.keys() );
}
}
class Schema extends BaseSchema {
constructor( validate, subValidators = null ) {
super();
this.validate_ = validate;
if ( subValidators !== null ) {
for ( const key of subValidators.keys() ) {
this.keyMap_.set( key, new Schema( subValidators.get( key ) ) );
}
}
}
/**
* Try to validate a JSON object against the internal JSON schema validator.
* The results are used to instantiate a ValidationStatus object that is
* returned.
*
* @param {Object} maybeValid a JSON object
* @return {ValidationStatus} a validation status instance
*/
validateStatus( maybeValid ) {
const result = this.validate_( maybeValid );
const validationStatus = new ValidationStatus( this.validate_, result );
return validationStatus;
}
}
const noSchema_ = { not: {} };
const noAjv_ = new Ajv();
const justNo_ = new Schema( noAjv_.compile( noSchema_ ) );
class GenericSchema extends BaseSchema {
constructor( keyMap ) {
super();
this.updateKeyMap( keyMap );
}
updateKeyMap( keyMap ) {
this.keyMap_ = keyMap;
}
/**
* Try to validate a JSON object against the internal validators. For each
* key in maybeValid, the corresponding value will be validated against the
* appropriate validator in this.keyMap_.
*
* The results are used to instantiate a ValidationStatus object that is
* returned.
*
* @param {Object} maybeValid a JSON object
* @return {ValidationStatus} a validation status instance
*/
validateStatus( maybeValid ) {
const allKeys = new Set( Object.keys( maybeValid ) );
allKeys.delete( 'Z1K1' );
for ( const key of this.keyMap_.keys() ) {
const toValidate = maybeValid[ key ];
// TODO (T290996): How to signal non-optional keys?
if ( toValidate === undefined ) {
continue;
}
allKeys.delete( key );
// Allow unresolved Z7, Z9, or Z18 to pass validation. This is a stopgap
// measure that will be phased out pending a massive validator overhaul.
if ( isMemberOfDangerTrio( toValidate ) ) {
continue;
}
// If key is not present, maybeValid[ key ] is undefined, which will
// not validate well.
const howsIt = this.keyMap_.get( key ).validateStatus( toValidate );
if ( !howsIt.isValid() ) {
// TODO (T296842): Somehow include key.
// TODO (T296842): Consider conjunction of all errors?
return howsIt;
}
}
// TODO (T296842): Better errors for stray keys; allow non-local keys?
if ( allKeys.size > 0 ) {
return justNo_.validateStatus( maybeValid );
}
return new ValidationStatus( null, true );
}
}
function dataDir( ...pathComponents ) {
return path.join(
path.dirname( path.dirname( path.dirname( __filename ) ) ),
'data', ...pathComponents );
}
class SchemaFactory {
constructor( ajv = null ) {
if ( ajv === null ) {
ajv = newAjv();
}
this.ajv_ = ajv;
}
/**
* Initializes a SchemaFactory linking schemata for canonical ZObjects.
*
* @return {SchemaFactory} factory with all canonical schemata included
*/
static CANONICAL() {
// Add all schemata for normal ZObjects to ajv's parsing context.
const ajv = newAjv();
const directory = dataDir( 'CANONICAL' );
// eslint-disable-next-line security/detect-unsafe-regex
const fileRegex = /((Z[1-9]\d*(K[1-9]\d*)?)|(LIST)|(RESOLVER))\.yaml/;
// eslint-disable-next-line security/detect-non-literal-fs-filename
for ( const fileName of fs.readdirSync( directory ) ) {
Iif ( fileName.match( fileRegex ) === null ) {
console.error( "Schema not found: '" + fileName + "'" );
continue;
}
const fullFile = path.join( directory, fileName );
ajv.addSchema( readYaml( fullFile ) );
}
return new SchemaFactory( ajv );
}
/**
* Initializes a SchemaFactory for mixed form Z1.
*
* @return {SchemaFactory} factory with lonely mixed form schema
*/
static MIXED() {
const ajv = newAjv();
const directory = dataDir( 'MIXED' );
for ( const filename of [ 'Z1.yaml', 'Z99.yaml' ] ) {
ajv.addSchema( readYaml( path.join( directory, filename ) ) );
}
return new SchemaFactory( ajv );
}
/**
* Initializes a SchemaFactory linking schemata for normal-form ZObjects.
*
* @return {SchemaFactory} factory with all normal-form schemata included
*/
static NORMAL() {
// Add all schemata for normal ZObjects to ajv's parsing context.
const ajv = newAjv();
const directory = dataDir( 'NORMAL' );
// eslint-disable-next-line security/detect-unsafe-regex
const fileRegex = /((Z[1-9]\d*(K[1-9]\d*)?)|(GENERIC)|(LIST)|(RESOLVER))\.yaml/;
// eslint-disable-next-line security/detect-non-literal-fs-filename
for ( const fileName of fs.readdirSync( directory ) ) {
Iif ( fileName.match( fileRegex ) === null ) {
console.error( "Schema not found: '" + fileName + "'" );
continue;
}
const fullFile = path.join( directory, fileName );
const schema = readYaml( fullFile );
ajv.addSchema( schema );
// Add literal schema too
const id = schema.$id + '_literal';
// Checks whether a literal definition exists
if ( schema.definitions.objects[ id ] ) {
const literal = {
$id: id,
$ref: schema.$ref + '_literal',
definitions: schema.definitions
};
ajv.addSchema( literal );
}
}
return new SchemaFactory( ajv );
}
/**
* Try to compile a schema. Use the factory's internal ajv_ in order to
* resolve references among multiple files.
*
* @param {Object} schema a JSON object containing a JSON Schema object
* @return {Schema} a Schema wrapping the resulting validator or null
*/
parse( schema ) {
try {
const validate = this.ajv_.compile( schema );
return new Schema( validate );
} catch ( err ) {
console.log( 'Could not parse schema' );
console.log( err.message );
console.log( 'schema was', schema );
return null;
}
}
/**
* Gets the AJV schemas for *all* the sub components of a schema that is defined
* in the ZID_literal.properties section.
* The returned map looks like Z1K1: AjvValidator, Z8K1: AjvValidator...
* If such mapping cannot be found, an empty map will be returned.
*
* @param {string} schemaName the name of the schema. It can be ZID or ZID_literal.
* @return {Map<string, *>} A mapping of the subcomponent keys and their AJV schema.
*/
getSubSchemas_( schemaName ) {
// For both ZID schema and ZID_literal schema, the schema definition is the same.
// This behavior is defined by the schema factory above.
let zid;
if ( schemaName.match( `^${ SCHEMA_NAME_REGEX }$` ) ) {
zid = schemaName;
} else if ( schemaName.match( `^${ SCHEMA_NAME_REGEX }_literal$` ) ) {
zid = schemaName.split( '_' )[ 0 ];
} else {
console.info(
`Cannot process schema name to get sub-validators: ${ schemaName }. ` +
'Accecptable format examples: Z42 and Z42_literal. Returning empty.' );
return new Map();
}
const overallSchema = this.ajv_.getSchema( schemaName ).schema;
// If this schema doesn't have a zid_literal field or the field does not
// contain properties (like Z1), we simply return an empty map.
if ( !overallSchema.definitions.objects[ `${ zid }_literal` ] ||
!overallSchema.definitions.objects[ `${ zid }_literal` ].properties ) {
return new Map();
}
const keys = Object.keys( overallSchema.definitions.objects[ `${ zid }_literal` ].properties );
const keyPathPrefix = `${ zid }#/definitions/objects/${ zid }_literal/properties/`;
return new Map(
keys.map( ( k ) => [ k, this.ajv_.getSchema( `${ keyPathPrefix }${ k }` ) ] ) );
}
/**
* Create a schema for the desired native type. A schema for normalized
* Z11s, for example, can be created as easily as
*
* const factory = SchemaFactory.NORMAL();
* const Z11Schema = factory.create("Z11");
*
* @param {string} schemaName the name of a supported schema
* @return {Schema} a fully-initialized Schema or null if unsupported
*/
create( schemaName ) {
let type = schemaName;
if ( schemaName === 'Z41' || schemaName === 'Z42' ) {
type = 'Z40';
}
let validate = null;
const message = null;
validate = this.ajv_.getSchema( type );
if ( validate === null || validate === undefined ) {
console.error( 'Could not find schema', schemaName, message );
return null;
}
const subValidators = this.getSubSchemas_( type );
return new Schema( validate, subValidators );
}
/**
* Create a Map[ key -> BaseSchema] for a given Z4. Resultant Map indicates
* against which validators to test the elements of a ZObject with the
* corresponding keys.
*
* @param {Object} Z4 a Z4/Type
* @param {Map} typeCache mapping from typekeys (see ZObjectKeyFactory.create) to BaseSchemata
* @return {Map} mapping from type keys to BaseSchemata
*/
keyMapForUserDefined( Z4, typeCache ) {
const keyMap = new Map();
const Z3s = convertZListToItemArray( Z4.Z4K2 );
for ( const Z3 of Z3s ) {
const propertyName = Z3.Z3K2.Z6K1;
const propertyType = Z3.Z3K1;
const identity = findIdentity( propertyType );
let subValidator;
// TODO (T316787): Ensure that this works properly for nested user-
// defined types.
if ( validatesAsReference( identity ).isValid() &&
isBuiltInType( identity.Z9K1 ) ) {
subValidator = this.create( identity.Z9K1 );
} else {
const key = ZObjectKeyFactory.create( propertyType ).asString();
if ( !( typeCache.has( key ) ) ) {
typeCache.set(
key,
this.createUserDefined( [ propertyType ] ).get( key ) );
}
subValidator = typeCache.get( key );
}
keyMap.set( propertyName, subValidator );
}
return keyMap;
}
/**
* Create a schema for given user-defined type. The Z4 corresponding to the
* type must be provided.
*
* Currently only works for normal form.
*
* TODO (T296843): Maybe make this work for canonical forms, too.
*
* Usage:
*
* // Z4 is a Z4 corresponding to a user-defined type
* const factory = SchemaFactory.NORMAL();
* const Z10001Schema = factory.createUserDefined([Z4]);
*
* @param {Object} Z4s the descriptor for the user-defined types
* @return {Schema} a fully-initialized Schema
*/
createUserDefined( Z4s ) {
const typeCache = new Map();
const normalize = require( './normalize.js' );
const normalZ4s = [];
for ( let errorIndex = 0; errorIndex < Z4s.length; ++errorIndex ) {
const Z4 = Z4s[ errorIndex ];
const normalizedEnvelope = normalize( Z4 );
if ( !isVoid( getError( normalizedEnvelope ) ) ) {
throw new Error( 'Failed to normalized Z4 at index: ' + errorIndex + '. Object: ' + JSON.stringify( Z4 ) );
}
normalZ4s.push( normalizedEnvelope.Z22K1 );
}
// Create a GenericSchema for each of the requested Z4s.
for ( const Z4 of normalZ4s ) {
const key = ZObjectKeyFactory.create( Z4 ).asString();
typeCache.set( key, new GenericSchema( new Map() ) );
}
// Populate all of the GenericSchemata with key maps.
// We iterate twice here to avoid circular references and to ensure we
// don't try to create schemata multiple times for any given Z4.
for ( const Z4 of normalZ4s ) {
const key = ZObjectKeyFactory.create( Z4 ).asString();
typeCache.get( key ).updateKeyMap( this.keyMapForUserDefined( Z4, typeCache ) );
}
return typeCache;
}
}
initializeValidators();
module.exports = {
SchemaFactory,
validatesAsZObject,
validatesAsType,
validatesAsError,
validatesAsString,
validatesAsFunctionCall,
validatesAsReference,
validatesAsQuote,
validatesAsArgumentReference,
validatesAsBoolean
};
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