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70 lines
1.8 KiB
70 lines
1.8 KiB
'use strict'
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const Ajv = require('ajv')
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function ValidatorSelector () {
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const validatorPool = new Map()
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const cache = new Map()
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cache.put = cache.set
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return function buildCompilerFromPool (externalSchemas, options) {
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const externals = JSON.stringify(externalSchemas)
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const ajvConfig = JSON.stringify(options.customOptions)
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const uniqueAjvKey = `${externals}${ajvConfig}`
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if (validatorPool.has(uniqueAjvKey)) {
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return validatorPool.get(uniqueAjvKey)
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}
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const compiler = ValidatorCompiler(externalSchemas, options, cache)
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validatorPool.set(uniqueAjvKey, compiler)
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return compiler
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}
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}
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function ValidatorCompiler (externalSchemas, options, cache) {
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// This instance of Ajv is private
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// it should not be customized or used
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const ajv = new Ajv(Object.assign({
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coerceTypes: true,
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useDefaults: true,
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removeAdditional: true,
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// Explicitly set allErrors to `false`.
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// When set to `true`, a DoS attack is possible.
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allErrors: false,
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nullable: true
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}, options.customOptions, { cache }))
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if (options.plugins && options.plugins.length > 0) {
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for (const plugin of options.plugins) {
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if (Array.isArray(plugin)) {
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plugin[0](ajv, plugin[1])
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} else {
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plugin(ajv)
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}
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}
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}
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const sourceSchemas = Object.values(externalSchemas)
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for (const extSchema of sourceSchemas) {
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ajv.addSchema(extSchema)
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}
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return function ({ schema/*, method, url, httpPart */ }) {
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// Ajv does not support compiling two schemas with the same
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// id inside the same instance. Therefore if we have already
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// compiled the schema with the given id, we just return it.
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if (schema.$id) {
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const stored = ajv.getSchema(schema.$id)
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if (stored) {
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return stored
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}
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}
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return ajv.compile(schema)
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}
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}
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module.exports = ValidatorSelector
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