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73 lines
2.5 KiB
TypeScript
73 lines
2.5 KiB
TypeScript
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import { default as Ajv, JSONSchemaType } from "ajv"
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import { ParsedUrlQuery } from "querystring"
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import { Response } from "./throwables"
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/**
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* Object containing data related to API request "query" (the `req.query` object, an instance of {@link ParsedUrlQuery}) validation.
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*
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* Since validation is performed **before** HEAD and OPTIONS requests are answered, there is no schema.
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*
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* @see {@link FestaBodyValidator}, {@link festaAPI} and its parameters {@link FestaAPI}.
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*/
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export type FestaQueryValidator<Config, Query> = {
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/**
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* Async function which validates the request query, ensuring it follows the {@link FestaQueryValidator.schema}.
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*
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* Any thrown {@link Error} should be caught by the handler, and its {@link Error.message} returned by the API.
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*
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* @param config - The current configuration of the request handler.
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* @param query - The deserialized contents of the request query.
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* @throws {ThrowableResponse}
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*/
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perform: (params: { config: Config, query: any }) => Promise<Query>,
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}
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/**
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* {@link FestaQueryValidator} which ignores the query.
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*
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* Never throws.
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*/
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export const festaNoQuery: FestaQueryValidator<any, {}> = {
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perform: async ({ }) => {
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return {}
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},
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}
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/**
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* Factory of {@link FestaQueryValidator}s using JSON Schema to perform the validation.
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*
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* _TypeScript note: `schema` parameter validation has been turned off because it was pointlessly annoying.
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*
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* @param {JSONSchemaType} schema - The {@link JSONSchemaType} to be used in validation.
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*/
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export function festaJsonSchemaQuery<Query>(schema: any /* JSONSchemaType<Body> */): FestaQueryValidator<any, Query> {
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const ajv = new Ajv()
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const validate = ajv.compile(schema)
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return {
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perform: async ({ query }) => {
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const valid = validate(query)
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if (!valid) {
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throw new Response({
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status: 404,
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body: {
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error: validate.errors!.map(error => error.message).join(" + "),
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validation: validate.errors!.map(error => {
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const obj: { [_: string]: string } = {}
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obj[error.keyword] = error.message!
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return obj
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}).reduce((a, b) => {
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return { ...a, ...b }
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}, {})
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}
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})
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}
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return query as Query
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}
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}
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}
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