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import type {
AnySchema,
AnySchemaObject,
AnyValidateFunction,
AsyncValidateFunction,
EvaluatedProperties,
EvaluatedItems,
} from "../types"
import type Ajv from "../core"
import type {InstanceOptions} from "../core"
import {CodeGen, _, nil, stringify, Name, Code, ValueScopeName} from "./codegen"
import ValidationError from "../runtime/validation_error"
import N from "./names"
import {LocalRefs, getFullPath, _getFullPath, inlineRef, normalizeId, resolveUrl} from "./resolve"
import {schemaHasRulesButRef, unescapeFragment} from "./util"
import {validateFunctionCode} from "./validate"
import {URIComponent} from "fast-uri"
import {JSONType} from "./rules"
export type SchemaRefs = {
[Ref in string]?: SchemaEnv | AnySchema
}
export interface SchemaCxt {
readonly gen: CodeGen
readonly allErrors?: boolean // validation mode - whether to collect all errors or break on error
readonly data: Name // Name with reference to the current part of data instance
readonly parentData: Name // should be used in keywords modifying data
readonly parentDataProperty: Code | number // should be used in keywords modifying data
readonly dataNames: Name[]
readonly dataPathArr: (Code | number)[]
readonly dataLevel: number // the level of the currently validated data,
// it can be used to access both the property names and the data on all levels from the top.
dataTypes: JSONType[] // data types applied to the current part of data instance
definedProperties: Set<string> // set of properties to keep track of for required checks
readonly topSchemaRef: Code
readonly validateName: Name
evaluated?: Name
readonly ValidationError?: Name
readonly schema: AnySchema // current schema object - equal to parentSchema passed via KeywordCxt
readonly schemaEnv: SchemaEnv
readonly rootId: string
baseId: string // the current schema base URI that should be used as the base for resolving URIs in references (\$ref)
readonly schemaPath: Code // the run-time expression that evaluates to the property name of the current schema
readonly errSchemaPath: string // this is actual string, should not be changed to Code
readonly errorPath: Code
readonly propertyName?: Name
readonly compositeRule?: boolean // true indicates that the current schema is inside the compound keyword,
// where failing some rule doesn't mean validation failure (`anyOf`, `oneOf`, `not`, `if`).
// This flag is used to determine whether you can return validation result immediately after any error in case the option `allErrors` is not `true.
// You only need to use it if you have many steps in your keywords and potentially can define multiple errors.
props?: EvaluatedProperties | Name // properties evaluated by this schema - used by parent schema or assigned to validation function
items?: EvaluatedItems | Name // last item evaluated by this schema - used by parent schema or assigned to validation function
jtdDiscriminator?: string
jtdMetadata?: boolean
readonly createErrors?: boolean
readonly opts: InstanceOptions // Ajv instance option.
readonly self: Ajv // current Ajv instance
}
export interface SchemaObjCxt extends SchemaCxt {
readonly schema: AnySchemaObject
}
interface SchemaEnvArgs {
readonly schema: AnySchema
readonly schemaId?: "$id" | "id"
readonly root?: SchemaEnv
readonly baseId?: string
readonly schemaPath?: string
readonly localRefs?: LocalRefs
readonly meta?: boolean
}
export class SchemaEnv implements SchemaEnvArgs {
readonly schema: AnySchema
readonly schemaId?: "$id" | "id"
readonly root: SchemaEnv
baseId: string // TODO possibly, it should be readonly
schemaPath?: string
localRefs?: LocalRefs
readonly meta?: boolean
readonly $async?: boolean // true if the current schema is asynchronous.
readonly refs: SchemaRefs = {}
readonly dynamicAnchors: {[Ref in string]?: true} = {}
validate?: AnyValidateFunction
validateName?: ValueScopeName
serialize?: (data: unknown) => string
serializeName?: ValueScopeName
parse?: (data: string) => unknown
parseName?: ValueScopeName
constructor(env: SchemaEnvArgs) {
let schema: AnySchemaObject | undefined
if (typeof env.schema == "object") schema = env.schema
this.schema = env.schema
this.schemaId = env.schemaId
this.root = env.root || this
this.baseId = env.baseId ?? normalizeId(schema?.[env.schemaId || "$id"])
this.schemaPath = env.schemaPath
this.localRefs = env.localRefs
this.meta = env.meta
this.$async = schema?.$async
this.refs = {}
}
}
// let codeSize = 0
// let nodeCount = 0
// Compiles schema in SchemaEnv
export function compileSchema(this: Ajv, sch: SchemaEnv): SchemaEnv {
// TODO refactor - remove compilations
const _sch = getCompilingSchema.call(this, sch)
if (_sch) return _sch
const rootId = getFullPath(this.opts.uriResolver, sch.root.baseId) // TODO if getFullPath removed 1 tests fails
const {es5, lines} = this.opts.code
const {ownProperties} = this.opts
const gen = new CodeGen(this.scope, {es5, lines, ownProperties})
let _ValidationError
if (sch.$async) {
_ValidationError = gen.scopeValue("Error", {
ref: ValidationError,
code: _`require("ajv/dist/runtime/validation_error").default`,
})
}
const validateName = gen.scopeName("validate")
sch.validateName = validateName
const schemaCxt: SchemaCxt = {
gen,
allErrors: this.opts.allErrors,
data: N.data,
parentData: N.parentData,
parentDataProperty: N.parentDataProperty,
dataNames: [N.data],
dataPathArr: [nil], // TODO can its length be used as dataLevel if nil is removed?
dataLevel: 0,
dataTypes: [],
definedProperties: new Set<string>(),
topSchemaRef: gen.scopeValue(
"schema",
this.opts.code.source === true
? {ref: sch.schema, code: stringify(sch.schema)}
: {ref: sch.schema}
),
validateName,
ValidationError: _ValidationError,
schema: sch.schema,
schemaEnv: sch,
rootId,
baseId: sch.baseId || rootId,
schemaPath: nil,
errSchemaPath: sch.schemaPath || (this.opts.jtd ? "" : "#"),
errorPath: _`""`,
opts: this.opts,
self: this,
}
let sourceCode: string | undefined
try {
this._compilations.add(sch)
validateFunctionCode(schemaCxt)
gen.optimize(this.opts.code.optimize)
// gen.optimize(1)
const validateCode = gen.toString()
sourceCode = `${gen.scopeRefs(N.scope)}return ${validateCode}`
// console.log((codeSize += sourceCode.length), (nodeCount += gen.nodeCount))
if (this.opts.code.process) sourceCode = this.opts.code.process(sourceCode, sch)
// console.log("\n\n\n *** \n", sourceCode)
const makeValidate = new Function(`${N.self}`, `${N.scope}`, sourceCode)
const validate: AnyValidateFunction = makeValidate(this, this.scope.get())
this.scope.value(validateName, {ref: validate})
validate.errors = null
validate.schema = sch.schema
validate.schemaEnv = sch
if (sch.$async) (validate as AsyncValidateFunction).$async = true
if (this.opts.code.source === true) {
validate.source = {validateName, validateCode, scopeValues: gen._values}
}
if (this.opts.unevaluated) {
const {props, items} = schemaCxt
validate.evaluated = {
props: props instanceof Name ? undefined : props,
items: items instanceof Name ? undefined : items,
dynamicProps: props instanceof Name,
dynamicItems: items instanceof Name,
}
if (validate.source) validate.source.evaluated = stringify(validate.evaluated)
}
sch.validate = validate
return sch
} catch (e) {
delete sch.validate
delete sch.validateName
if (sourceCode) this.logger.error("Error compiling schema, function code:", sourceCode)
// console.log("\n\n\n *** \n", sourceCode, this.opts)
throw e
} finally {
this._compilations.delete(sch)
}
}
export function resolveRef(
this: Ajv,
root: SchemaEnv,
baseId: string,
ref: string
): AnySchema | SchemaEnv | undefined {
ref = resolveUrl(this.opts.uriResolver, baseId, ref)
const schOrFunc = root.refs[ref]
if (schOrFunc) return schOrFunc
let _sch = resolve.call(this, root, ref)
if (_sch === undefined) {
const schema = root.localRefs?.[ref] // TODO maybe localRefs should hold SchemaEnv
const {schemaId} = this.opts
if (schema) _sch = new SchemaEnv({schema, schemaId, root, baseId})
}
if (_sch === undefined) return
return (root.refs[ref] = inlineOrCompile.call(this, _sch))
}
function inlineOrCompile(this: Ajv, sch: SchemaEnv): AnySchema | SchemaEnv {
if (inlineRef(sch.schema, this.opts.inlineRefs)) return sch.schema
return sch.validate ? sch : compileSchema.call(this, sch)
}
// Index of schema compilation in the currently compiled list
export function getCompilingSchema(this: Ajv, schEnv: SchemaEnv): SchemaEnv | void {
for (const sch of this._compilations) {
if (sameSchemaEnv(sch, schEnv)) return sch
}
}
function sameSchemaEnv(s1: SchemaEnv, s2: SchemaEnv): boolean {
return s1.schema === s2.schema && s1.root === s2.root && s1.baseId === s2.baseId
}
// resolve and compile the references ($ref)
// TODO returns AnySchemaObject (if the schema can be inlined) or validation function
function resolve(
this: Ajv,
root: SchemaEnv, // information about the root schema for the current schema
ref: string // reference to resolve
): SchemaEnv | undefined {
let sch
while (typeof (sch = this.refs[ref]) == "string") ref = sch
return sch || this.schemas[ref] || resolveSchema.call(this, root, ref)
}
// Resolve schema, its root and baseId
export function resolveSchema(
this: Ajv,
root: SchemaEnv, // root object with properties schema, refs TODO below SchemaEnv is assigned to it
ref: string // reference to resolve
): SchemaEnv | undefined {
const p = this.opts.uriResolver.parse(ref)
const refPath = _getFullPath(this.opts.uriResolver, p)
let baseId = getFullPath(this.opts.uriResolver, root.baseId, undefined)
// TODO `Object.keys(root.schema).length > 0` should not be needed - but removing breaks 2 tests
if (Object.keys(root.schema).length > 0 && refPath === baseId) {
return getJsonPointer.call(this, p, root)
}
const id = normalizeId(refPath)
const schOrRef = this.refs[id] || this.schemas[id]
if (typeof schOrRef == "string") {
const sch = resolveSchema.call(this, root, schOrRef)
if (typeof sch?.schema !== "object") return
return getJsonPointer.call(this, p, sch)
}
if (typeof schOrRef?.schema !== "object") return
if (!schOrRef.validate) compileSchema.call(this, schOrRef)
if (id === normalizeId(ref)) {
const {schema} = schOrRef
const {schemaId} = this.opts
const schId = schema[schemaId]
if (schId) baseId = resolveUrl(this.opts.uriResolver, baseId, schId)
return new SchemaEnv({schema, schemaId, root, baseId})
}
return getJsonPointer.call(this, p, schOrRef)
}
const PREVENT_SCOPE_CHANGE = new Set([
"properties",
"patternProperties",
"enum",
"dependencies",
"definitions",
])
function getJsonPointer(
this: Ajv,
parsedRef: URIComponent,
{baseId, schema, root}: SchemaEnv
): SchemaEnv | undefined {
if (parsedRef.fragment?.[0] !== "/") return
for (const part of parsedRef.fragment.slice(1).split("/")) {
if (typeof schema === "boolean") return
const partSchema = schema[unescapeFragment(part)]
if (partSchema === undefined) return
schema = partSchema
// TODO PREVENT_SCOPE_CHANGE could be defined in keyword def?
const schId = typeof schema === "object" && schema[this.opts.schemaId]
if (!PREVENT_SCOPE_CHANGE.has(part) && schId) {
baseId = resolveUrl(this.opts.uriResolver, baseId, schId)
}
}
let env: SchemaEnv | undefined
if (typeof schema != "boolean" && schema.$ref && !schemaHasRulesButRef(schema, this.RULES)) {
const $ref = resolveUrl(this.opts.uriResolver, baseId, schema.$ref)
env = resolveSchema.call(this, root, $ref)
}
// even though resolution failed we need to return SchemaEnv to throw exception
// so that compileAsync loads missing schema.
const {schemaId} = this.opts
env = env || new SchemaEnv({schema, schemaId, root, baseId})
if (env.schema !== env.root.schema) return env
return undefined
}