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'use strict'
const Ajv = require('ajv')
const fastUri = require('fast-uri')
const ajvFormats = require('ajv-formats')
const clone = require('rfdc')({ proto: true })
class Validator {
constructor (ajvOptions) {
this.ajv = new Ajv({
...ajvOptions,
strictSchema: false,
validateSchema: false,
allowUnionTypes: true,
uriResolver: fastUri
})
ajvFormats(this.ajv)
this.ajv.addKeyword({
keyword: 'fjs_type',
type: 'object',
errors: false,
validate: (_type, date) => {
return date instanceof Date
}
})
this._ajvSchemas = {}
this._ajvOptions = ajvOptions || {}
}
addSchema (schema, schemaName) {
let schemaKey = schema.$id || schemaName
if (schema.$id !== undefined && schema.$id[0] === '#') {
schemaKey = schemaName + schema.$id // relative URI
}
if (
this.ajv.refs[schemaKey] === undefined &&
this.ajv.schemas[schemaKey] === undefined
) {
const ajvSchema = clone(schema)
this.convertSchemaToAjvFormat(ajvSchema)
this.ajv.addSchema(ajvSchema, schemaKey)
this._ajvSchemas[schemaKey] = schema
}
}
validate (schemaRef, data) {
return this.ajv.validate(schemaRef, data)
}
// Ajv does not support js date format. In order to properly validate objects containing a date,
// it needs to replace all occurrences of the string date format with a custom keyword fjs_type.
// (see https://github.com/fastify/fast-json-stringify/pull/441)
convertSchemaToAjvFormat (schema) {
if (schema === null) return
if (schema.type === 'string') {
schema.fjs_type = 'string'
schema.type = ['string', 'object']
} else if (
Array.isArray(schema.type) &&
schema.type.includes('string') &&
!schema.type.includes('object')
) {
schema.fjs_type = 'string'
schema.type.push('object')
}
for (const property in schema) {
if (typeof schema[property] === 'object') {
this.convertSchemaToAjvFormat(schema[property])
}
}
}
getState () {
return {
ajvOptions: this._ajvOptions,
ajvSchemas: this._ajvSchemas
}
}
static restoreFromState (state) {
const validator = new Validator(state.ajvOptions)
for (const [id, ajvSchema] of Object.entries(state.ajvSchemas)) {
validator.ajv.addSchema(ajvSchema, id)
}
return validator
}
}
module.exports = Validator
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