87 lines
2.6 KiB
TypeScript
87 lines
2.6 KiB
TypeScript
import type { Context, Env, Input, MiddlewareHandler, TypedResponse, ValidationTargets } from 'hono'
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import { validator } from 'hono/validator'
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import { ZodObject } from 'zod'
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import type { ZodError, ZodSchema, z } from 'zod'
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export type Hook<
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T,
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E extends Env,
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P extends string,
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Target extends keyof ValidationTargets = keyof ValidationTargets,
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O = {}
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> = (
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result: ({ success: true; data: T } | { success: false; error: ZodError; data: T }) & {
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target: Target
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},
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c: Context<E, P>
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) => Response | void | TypedResponse<O> | Promise<Response | void | TypedResponse<O>>
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type HasUndefined<T> = undefined extends T ? true : false
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export const zValidator = <
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T extends ZodSchema,
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Target extends keyof ValidationTargets,
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E extends Env,
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P extends string,
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In = z.input<T>,
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Out = z.output<T>,
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I extends Input = {
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in: HasUndefined<In> extends true
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? {
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[K in Target]?: In extends ValidationTargets[K]
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? In
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: { [K2 in keyof In]?: ValidationTargets[K][K2] }
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}
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: {
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[K in Target]: In extends ValidationTargets[K]
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? In
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: { [K2 in keyof In]: ValidationTargets[K][K2] }
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}
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out: { [K in Target]: Out }
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},
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V extends I = I
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>(
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target: Target,
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schema: T,
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hook?: Hook<z.infer<T>, E, P, Target>
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): MiddlewareHandler<E, P, V> =>
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// @ts-expect-error not typed well
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validator(target, async (value, c) => {
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let validatorValue = value
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// in case where our `target` === `header`, Hono parses all of the headers into lowercase.
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// this might not match the Zod schema, so we want to make sure that we account for that when parsing the schema.
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if (target === 'header' && schema instanceof ZodObject) {
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// create an object that maps lowercase schema keys to lowercase
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const schemaKeys = Object.keys(schema.shape)
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const caseInsensitiveKeymap = Object.fromEntries(
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schemaKeys.map((key) => [key.toLowerCase(), key])
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)
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validatorValue = Object.fromEntries(
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Object.entries(value).map(([key, value]) => [caseInsensitiveKeymap[key] || key, value])
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)
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}
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const result = await schema.safeParseAsync(validatorValue)
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if (hook) {
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const hookResult = await hook({ data: validatorValue, ...result, target }, c)
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if (hookResult) {
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if (hookResult instanceof Response) {
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return hookResult
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}
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if ('response' in hookResult) {
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return hookResult.response
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}
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}
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}
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if (!result.success) {
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return c.json(result, 400)
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}
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return result.data as z.infer<T>
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})
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