66 lines
2.0 KiB
TypeScript
66 lines
2.0 KiB
TypeScript
import type { Context, MiddlewareHandler, Env, ValidationTargets, TypedResponse, Input } from 'hono'
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import { validator } from 'hono/validator'
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import type { z, ZodSchema, ZodError } from 'zod'
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export type Hook<T, E extends Env, P extends string, O = {}> = (
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result: { success: true; data: T } | { success: false; error: ZodError; data: T },
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c: Context<E, P>
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) => Response | Promise<Response> | void | 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]?: K extends 'json'
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? In
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: HasUndefined<keyof ValidationTargets[K]> extends true
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? { [K2 in keyof In]?: ValidationTargets[K][K2] }
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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]: K extends 'json'
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? In
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: HasUndefined<keyof ValidationTargets[K]> extends true
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? { [K2 in keyof In]?: ValidationTargets[K][K2] }
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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>
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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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const result = await schema.safeParseAsync(value)
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if (hook) {
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const hookResult = hook({ data: value, ...result }, c)
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if (hookResult) {
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if (hookResult instanceof Response || hookResult instanceof Promise) {
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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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const data = result.data as z.infer<T>
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return data
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})
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