From 8230e6549bf6bea4c92028d81ee9de5eb8c978d7 Mon Sep 17 00:00:00 2001
From: TheoryOfNekomata <allan.crisostomo@outlook.com>
Date: Sun, 24 Sep 2023 11:59:44 +0800
Subject: [PATCH] Implement adjustments to handlers

Allow ways to send methods other than get/post on server-side.
---
 .../src/pages/a/notes/[noteId].ts             |  12 ++
 .../src/pages/notes/[noteId].tsx              |  56 +++++-
 .../src/pages/notes/index.tsx                 |   6 +-
 .../src/styles/globals.css                    |   4 +
 packages/iceform-next/.gitignore              |   1 +
 .../src/client/components/Form.tsx            |  13 +-
 packages/iceform-next/src/common/constants.ts |   2 +
 packages/iceform-next/src/server/action.ts    | 141 +++++++++++++
 packages/iceform-next/src/server/constants.ts |   1 -
 .../iceform-next/src/server/destination.ts    | 103 ++++++++++
 packages/iceform-next/src/server/index.ts     | 189 +-----------------
 .../iceform-next/src/utils/serialization.ts   |   2 +-
 12 files changed, 330 insertions(+), 200 deletions(-)
 create mode 100644 packages/iceform-next/src/common/constants.ts
 create mode 100644 packages/iceform-next/src/server/action.ts
 create mode 100644 packages/iceform-next/src/server/destination.ts

diff --git a/packages/iceform-next-sandbox/src/pages/a/notes/[noteId].ts b/packages/iceform-next-sandbox/src/pages/a/notes/[noteId].ts
index 9f7d994..4986fea 100644
--- a/packages/iceform-next-sandbox/src/pages/a/notes/[noteId].ts
+++ b/packages/iceform-next-sandbox/src/pages/a/notes/[noteId].ts
@@ -6,6 +6,18 @@ const ActionNotesResourcePage: NextPage = () => null;
 
 const getServerSideProps = Iceform.action.getServerSideProps({
 	fn: noteResource,
+	onAction: async (context) => {
+		if (context.req.method?.toLowerCase() === 'delete') {
+			return {
+				redirect: {
+					destination: '/notes',
+					permanent: false,
+				},
+			};
+		}
+
+		// use default behavior
+	},
 });
 
 export {
diff --git a/packages/iceform-next-sandbox/src/pages/notes/[noteId].tsx b/packages/iceform-next-sandbox/src/pages/notes/[noteId].tsx
index 18efec1..7d94bcf 100644
--- a/packages/iceform-next-sandbox/src/pages/notes/[noteId].tsx
+++ b/packages/iceform-next-sandbox/src/pages/notes/[noteId].tsx
@@ -1,11 +1,21 @@
 import * as Iceform from '@modal-sh/iceform-next';
 import * as React from 'react';
 
-const NotesItemPage: Iceform.NextPage = ({
+export interface NotesItemPageProps {
+	note: {
+		id: string;
+		title: string;
+		content: string;
+		image: string;
+	}
+}
+
+const NotesItemPage: Iceform.NextPage<NotesItemPageProps> = ({
 	req,
 	res,
+	note,
 }) => {
-	const body = (res.body ?? {}) as Record<string, unknown>;
+	const body = (res.body ?? note ?? {}) as Record<string, unknown>;
 	const {response, loading, ...isoformProps} = Iceform.useResponse({
 		res
 	});
@@ -26,22 +36,23 @@ const NotesItemPage: Iceform.NextPage = ({
 			method="post"
 			action={`/a/notes/${req.query.noteId}`}
 			clientAction={`/api/notes/${req.query.noteId}`}
+			clientMethod="put"
 		>
 			<div>
 				<label>
-					<span>Title</span>
+					<span className="after:block">Title</span>
 					<input type="text" name="title" defaultValue={body.title as string} />
 				</label>
 			</div>
 			<div>
 				<label>
-					<span>Image</span>
+					<span className="after:block">Image</span>
 					<input type="file" name="image" />
 				</label>
 			</div>
 			<div>
 				<label>
-					<span>Content</span>
+					<span className="after:block">Content</span>
 					<textarea name="content" defaultValue={body.content as string} />
 				</label>
 			</div>
@@ -49,9 +60,40 @@ const NotesItemPage: Iceform.NextPage = ({
 				<button type="submit">Submit</button>
 			</div>
 		</Iceform.Form>
-	)
+	);
 };
 
-export const getServerSideProps = Iceform.destination.getServerSideProps();
+export const getServerSideProps = Iceform.destination.getServerSideProps({
+	fn: async (actionReq, actionRes, ctx) => {
+		const {noteId} = ctx.query;
+		let origin: string;
+		if (ctx.req.headers.referer) {
+			const refererUrl = new URL(ctx.req.headers.referer as string);
+			origin = refererUrl.origin;
+		} else {
+			// TODO how to get the scheme?
+			const scheme = 'http';
+			origin = `${scheme}://${ctx.req.headers.host}`;
+		}
+		const url = new URL(`/api/notes/${noteId}`, origin);
+		const noteResponse = await fetch(url.toString(), {
+			headers: {
+				'Accept': 'application/json',
+			}
+		});
+		if (noteResponse.ok) {
+			const note = await noteResponse.json();
+			return {
+				props: {
+					note,
+				},
+			};
+		}
+
+		return {
+			notFound: true,
+		};
+	},
+});
 
 export default NotesItemPage;
diff --git a/packages/iceform-next-sandbox/src/pages/notes/index.tsx b/packages/iceform-next-sandbox/src/pages/notes/index.tsx
index c0d8db7..271f09b 100644
--- a/packages/iceform-next-sandbox/src/pages/notes/index.tsx
+++ b/packages/iceform-next-sandbox/src/pages/notes/index.tsx
@@ -10,19 +10,19 @@ const NotesPage: NextPage = () => {
 		>
 			<div>
 				<label>
-					<span>Title</span>
+					<span className="after:block">Title</span>
 					<input type="text" name="title" />
 				</label>
 			</div>
 			<div>
 				<label>
-					<span>Image</span>
+					<span className="after:block">Image</span>
 					<input type="file" name="image" />
 				</label>
 			</div>
 			<div>
 				<label>
-					<span>Content</span>
+					<span className="after:block">Content</span>
 					<textarea name="content" />
 				</label>
 			</div>
diff --git a/packages/iceform-next-sandbox/src/styles/globals.css b/packages/iceform-next-sandbox/src/styles/globals.css
index fd81e88..1bbafaa 100644
--- a/packages/iceform-next-sandbox/src/styles/globals.css
+++ b/packages/iceform-next-sandbox/src/styles/globals.css
@@ -25,3 +25,7 @@ body {
     )
     rgb(var(--background-start-rgb));
 }
+
+input, select, textarea {
+	background-color: rgb(var(--background-start-rgb));
+}
diff --git a/packages/iceform-next/.gitignore b/packages/iceform-next/.gitignore
index 53992de..bea7415 100644
--- a/packages/iceform-next/.gitignore
+++ b/packages/iceform-next/.gitignore
@@ -105,3 +105,4 @@ dist
 .tern-port
 
 .npmrc
+types/
diff --git a/packages/iceform-next/src/client/components/Form.tsx b/packages/iceform-next/src/client/components/Form.tsx
index d2def22..088ea7f 100644
--- a/packages/iceform-next/src/client/components/Form.tsx
+++ b/packages/iceform-next/src/client/components/Form.tsx
@@ -15,6 +15,7 @@ import {
 	FormDerivedElementComponent,
 } from '../common';
 import { useFormFetch } from '../hooks/useFormFetch';
+import { METHOD_FORM_KEY } from '../../common/constants';
 
 export interface FormProps extends Omit<React.HTMLProps<FormDerivedElement>, 'action' | 'method'> {
 	action?: string;
@@ -59,9 +60,16 @@ export const Form = React.forwardRef<FormDerivedElement, FormProps>(({
 		responseEncType,
 		serializerOptions,
 	});
-
 	const serverMethodRaw = method.toLowerCase();
 	const serverMethod = serverMethodRaw === 'get' ? 'get' : 'post';
+	const [serverMethodOverride, setServerMethodOverride] = React.useState(
+		serverMethod.toLowerCase() !== clientMethod.toLowerCase(),
+	);
+
+	React.useEffect(() => {
+		// hide server override in client
+		setServerMethodOverride(false);
+	}, []);
 
 	return (
 		<FormDerivedElementComponent
@@ -72,6 +80,9 @@ export const Form = React.forwardRef<FormDerivedElement, FormProps>(({
 			method={serverMethod}
 			encType={ENCTYPE_MULTIPART_FORM_DATA}
 		>
+			{serverMethodOverride && (
+				<input type="hidden" name={METHOD_FORM_KEY} value={clientMethod} />
+			)}
 			{children}
 		</FormDerivedElementComponent>
 	);
diff --git a/packages/iceform-next/src/common/constants.ts b/packages/iceform-next/src/common/constants.ts
new file mode 100644
index 0000000..00d0d68
--- /dev/null
+++ b/packages/iceform-next/src/common/constants.ts
@@ -0,0 +1,2 @@
+export const PREVENT_REDIRECT_FORM_KEY = '__iceform_prevent_redirect' as const;
+export const METHOD_FORM_KEY = '__iceform_method' as const;
diff --git a/packages/iceform-next/src/server/action.ts b/packages/iceform-next/src/server/action.ts
new file mode 100644
index 0000000..8c556d5
--- /dev/null
+++ b/packages/iceform-next/src/server/action.ts
@@ -0,0 +1,141 @@
+import {
+	GetServerSideProps,
+	NextApiHandler,
+	PageConfig,
+	NextApiRequest as DefaultNextApiRequest, PreviewData, GetServerSidePropsContext,
+} from 'next';
+import { ParsedUrlQuery } from 'querystring';
+import { deserializeBody, EncTypeDeserializerMap } from '../utils/serialization';
+import { IceformNextServerResponse } from './response';
+import {
+	BODY_COOKIE_KEY, CONTENT_TYPE_COOKIE_KEY,
+	CookieManager,
+	STATUS_CODE_COOKIE_KEY,
+	STATUS_MESSAGE_COOKIE_KEY,
+} from '../utils/cookies';
+import {
+	METHOD_FORM_KEY,
+	PREVENT_REDIRECT_FORM_KEY,
+} from '../common/constants';
+import {
+	ACTION_STATUS_CODE,
+	DEFAULT_METHOD,
+} from './constants';
+
+export const getApiConfig = (customConfig = {} as PageConfig) => ({
+	api: {
+		...(customConfig.api ?? {}),
+		bodyParser: false,
+	},
+});
+
+export type OnActionFunction<
+	Props extends Record<string, unknown> = Record<string, unknown>,
+	Params extends ParsedUrlQuery = ParsedUrlQuery,
+	Preview extends PreviewData = PreviewData,
+> = (
+	context: GetServerSidePropsContext<Params, Preview>,
+) => Promise<Awaited<ReturnType<GetServerSideProps<Props, Params, Preview>>> | undefined>;
+
+export interface ActionWrapperOptions {
+	fn: NextApiHandler,
+	onAction?: OnActionFunction,
+	deserializers?: EncTypeDeserializerMap,
+	/**
+	 * Maps the Location header from the handler response to an accessible URL.
+	 * @param url
+	 */
+	mapLocationToRedirectDestination?: (referer: string, url: string) => string,
+}
+
+export const wrapApiHandler = (
+	options: ActionWrapperOptions,
+): NextApiHandler => async (req, res) => {
+	const body = await deserializeBody({
+		req,
+		deserializers: options.deserializers,
+	});
+	const reqMut = req as unknown as Record<string, unknown>;
+	reqMut.body = body;
+	return options.fn(reqMut as unknown as DefaultNextApiRequest, res);
+};
+
+export const getServerSideProps = (
+	options: ActionWrapperOptions,
+): GetServerSideProps => async (ctx) => {
+	const { referer = '/' } = ctx.req.headers;
+	const deserialized = await deserializeBody({
+		req: ctx.req,
+		deserializers: options.deserializers,
+	});
+
+	const defaultMethod = ctx.req.method ?? DEFAULT_METHOD;
+	let effectiveMethod = defaultMethod;
+	let mockReqBody: unknown = deserialized;
+	if (typeof deserialized === 'object' && deserialized !== null) {
+		const {
+			[METHOD_FORM_KEY]: theMethod,
+			...theMockReqBody
+		} = deserialized as {
+			[METHOD_FORM_KEY]?: string,
+			[key: string]: unknown,
+		};
+		effectiveMethod = theMethod ?? defaultMethod;
+		mockReqBody = theMockReqBody;
+	}
+
+	const mockReq = {
+		...ctx.req,
+		body: mockReqBody,
+		query: {
+			...ctx.query,
+			...(ctx.params ?? {}),
+		},
+		// ?: how to prevent malicious method spoofing?
+		method: effectiveMethod,
+	} as DefaultNextApiRequest;
+
+	const mockRes = new IceformNextServerResponse(ctx.req);
+	await options.fn(mockReq, mockRes);
+
+	const cookieManager = new CookieManager(ctx);
+	cookieManager.setCookie(STATUS_CODE_COOKIE_KEY, mockRes.statusCode.toString());
+	cookieManager.setCookie(STATUS_MESSAGE_COOKIE_KEY, mockRes.statusMessage);
+	if (mockRes.data) {
+		cookieManager.setCookie(BODY_COOKIE_KEY, mockRes.data as string);
+		if (mockRes.contentType) {
+			cookieManager.setCookie(CONTENT_TYPE_COOKIE_KEY, mockRes.contentType);
+		}
+	}
+
+	if (typeof options.onAction === 'function') {
+		const onActionResult = await options.onAction(ctx);
+		if (onActionResult) {
+			return onActionResult;
+		}
+	}
+
+	const preventRedirect = (
+		typeof mockReq.body === 'object'
+		&& mockReq.body !== null
+		&& PREVENT_REDIRECT_FORM_KEY in mockReq.body
+	);
+	const redirectDestination = (
+		mockRes.location
+		&& typeof options.mapLocationToRedirectDestination === 'function'
+		&& !preventRedirect
+	)
+		? options.mapLocationToRedirectDestination(referer, mockRes.location)
+		: referer;
+
+	return {
+		redirect: {
+			destination: redirectDestination,
+			statusCode: ACTION_STATUS_CODE,
+		},
+		props: {
+			query: ctx.query,
+			body: mockRes.data,
+		},
+	};
+};
diff --git a/packages/iceform-next/src/server/constants.ts b/packages/iceform-next/src/server/constants.ts
index f033ead..8ada6b5 100644
--- a/packages/iceform-next/src/server/constants.ts
+++ b/packages/iceform-next/src/server/constants.ts
@@ -1,5 +1,4 @@
 export const METHODS_WITH_BODY = ['POST', 'PUT', 'PATCH', 'DELETE'] as const;
-export const PREVENT_REDIRECT_FORM_KEY = '__iceform_prevent_redirect' as const;
 export const DEFAULT_METHOD = 'GET' as const;
 export const DEFAULT_ENCODING = 'utf-8' as const;
 export const ACTION_STATUS_CODE = 307 as const; // temporary redirect
diff --git a/packages/iceform-next/src/server/destination.ts b/packages/iceform-next/src/server/destination.ts
new file mode 100644
index 0000000..4e9f337
--- /dev/null
+++ b/packages/iceform-next/src/server/destination.ts
@@ -0,0 +1,103 @@
+import { ParsedUrlQuery } from 'querystring';
+import { GetServerSideProps, GetServerSidePropsContext, PreviewData } from 'next';
+import { deserialize } from 'seroval';
+import { NextApiRequest, NextApiResponse } from '../common/types';
+import {
+	DEFAULT_ENCODING,
+	DEFAULT_METHOD,
+	DEFAULT_RESPONSE_STATUS_CODE,
+	METHODS_WITH_BODY,
+} from './constants';
+import { getBody } from '../utils/request';
+import {
+	BODY_COOKIE_KEY, CONTENT_TYPE_COOKIE_KEY,
+	CookieManager,
+	STATUS_CODE_COOKIE_KEY,
+	STATUS_MESSAGE_COOKIE_KEY,
+} from '../utils/cookies';
+import { ENCTYPE_APPLICATION_JSON, ENCTYPE_APPLICATION_OCTET_STREAM } from '../common/enctypes';
+
+export type DestinationGetServerSideProps<
+	Props extends Record<string, unknown> = Record<string, unknown>,
+	Params extends ParsedUrlQuery = ParsedUrlQuery,
+	Preview extends PreviewData = PreviewData,
+> = (
+	actionReq: NextApiRequest,
+	actionRes: NextApiResponse,
+	context: GetServerSidePropsContext<Params, Preview>,
+) => ReturnType<GetServerSideProps<Props, Params, Preview>>;
+
+export interface DestinationWrapperOptions {
+	fn?: DestinationGetServerSideProps;
+}
+
+export const getServerSideProps = (
+	options = {} as DestinationWrapperOptions,
+): GetServerSideProps => async (ctx) => {
+	const req: NextApiRequest = {
+		query: {
+			...ctx.query,
+			...(ctx.params ?? {}),
+		},
+		body: null,
+	};
+	const { method = DEFAULT_METHOD } = ctx.req;
+
+	if (METHODS_WITH_BODY.includes(method.toUpperCase() as typeof METHODS_WITH_BODY[number])) {
+		const body = await getBody(ctx.req);
+		req.body = body.toString(DEFAULT_ENCODING);
+	}
+
+	const cookieManager = new CookieManager(ctx);
+	// TODO how to properly remove cookies without leftovers?
+	if (cookieManager.hasCookie(STATUS_CODE_COOKIE_KEY)) {
+		ctx.res.statusCode = Number(
+			cookieManager.getCookie(STATUS_CODE_COOKIE_KEY) || DEFAULT_RESPONSE_STATUS_CODE,
+		);
+		cookieManager.unsetCookie(STATUS_CODE_COOKIE_KEY);
+	}
+
+	if (cookieManager.hasCookie(STATUS_MESSAGE_COOKIE_KEY)) {
+		ctx.res.statusMessage = cookieManager.getCookie(STATUS_MESSAGE_COOKIE_KEY) || '';
+		cookieManager.unsetCookie(STATUS_MESSAGE_COOKIE_KEY);
+	}
+
+	const res: NextApiResponse = {};
+	if (cookieManager.hasCookie(BODY_COOKIE_KEY)) {
+		const resBody = cookieManager.getCookie(BODY_COOKIE_KEY);
+		const contentType = cookieManager.getCookie(CONTENT_TYPE_COOKIE_KEY);
+		if (contentType === ENCTYPE_APPLICATION_JSON) {
+			res.body = deserialize(resBody);
+		} else if (contentType === ENCTYPE_APPLICATION_OCTET_STREAM) {
+			res.body = deserialize(resBody);
+		} else {
+			const c = console;
+			c.warn('Could not parse response body, returning nothing');
+			res.body = null;
+		}
+		cookieManager.unsetCookie(BODY_COOKIE_KEY);
+		cookieManager.unsetCookie(CONTENT_TYPE_COOKIE_KEY);
+	}
+
+	const gspResult = (
+		typeof options?.fn === 'function'
+			? await options.fn(req, res, ctx)
+			: {
+				props: {},
+			}
+	);
+
+	if ('props' in gspResult) {
+		return {
+			...gspResult,
+			props: {
+				...gspResult.props,
+				req,
+				res,
+			},
+		};
+	}
+
+	// redirect/not found will be treated as default behavior
+	return gspResult;
+};
diff --git a/packages/iceform-next/src/server/index.ts b/packages/iceform-next/src/server/index.ts
index ea6ff1c..891a467 100644
--- a/packages/iceform-next/src/server/index.ts
+++ b/packages/iceform-next/src/server/index.ts
@@ -1,187 +1,2 @@
-import {
-	GetServerSideProps,
-	NextApiHandler,
-	NextApiRequest as DefaultNextApiRequest,
-	PageConfig,
-} from 'next';
-import { deserialize } from 'seroval';
-import {
-	NextApiResponse,
-	NextApiRequest,
-} from '../common/types';
-import {
-	ENCTYPE_APPLICATION_JSON,
-	ENCTYPE_APPLICATION_OCTET_STREAM,
-} from '../common/enctypes';
-import { getBody } from '../utils/request';
-import {
-	CookieManager,
-	BODY_COOKIE_KEY,
-	STATUS_CODE_COOKIE_KEY,
-	STATUS_MESSAGE_COOKIE_KEY,
-	CONTENT_TYPE_COOKIE_KEY,
-} from '../utils/cookies';
-import { deserializeBody, EncTypeDeserializerMap } from '../utils/serialization';
-import { IceformNextServerResponse } from './response';
-import {
-	DEFAULT_METHOD,
-	DEFAULT_ENCODING,
-	DEFAULT_RESPONSE_STATUS_CODE,
-	ACTION_STATUS_CODE,
-	METHODS_WITH_BODY,
-	PREVENT_REDIRECT_FORM_KEY,
-} from './constants';
-
-export namespace destination {
-	export const getServerSideProps = (
-		gspFn?: GetServerSideProps,
-	): GetServerSideProps => async (ctx) => {
-		const req: NextApiRequest = {
-			query: {
-				...ctx.query,
-				...(ctx.params ?? {}),
-			},
-			body: null,
-		};
-		const { method = DEFAULT_METHOD } = ctx.req;
-
-		if (METHODS_WITH_BODY.includes(method.toUpperCase() as typeof METHODS_WITH_BODY[number])) {
-			const body = await getBody(ctx.req);
-			req.body = body.toString(DEFAULT_ENCODING);
-		}
-
-		const cookieManager = new CookieManager(ctx);
-		// TODO how to properly remove cookies without leftovers?
-		if (cookieManager.hasCookie(STATUS_CODE_COOKIE_KEY)) {
-			ctx.res.statusCode = Number(
-				cookieManager.getCookie(STATUS_CODE_COOKIE_KEY) || DEFAULT_RESPONSE_STATUS_CODE,
-			);
-			cookieManager.unsetCookie(STATUS_CODE_COOKIE_KEY);
-		}
-
-		if (cookieManager.hasCookie(STATUS_MESSAGE_COOKIE_KEY)) {
-			ctx.res.statusMessage = cookieManager.getCookie(STATUS_MESSAGE_COOKIE_KEY) || '';
-			cookieManager.unsetCookie(STATUS_MESSAGE_COOKIE_KEY);
-		}
-
-		const res: NextApiResponse = {};
-		if (cookieManager.hasCookie(BODY_COOKIE_KEY)) {
-			const resBody = cookieManager.getCookie(BODY_COOKIE_KEY);
-			const contentType = cookieManager.getCookie(CONTENT_TYPE_COOKIE_KEY);
-			if (contentType === ENCTYPE_APPLICATION_JSON) {
-				res.body = deserialize(resBody);
-			} else if (contentType === ENCTYPE_APPLICATION_OCTET_STREAM) {
-				res.body = deserialize(resBody);
-			} else {
-				const c = console;
-				c.warn('Could not parse response body, returning nothing');
-				res.body = null;
-			}
-			cookieManager.unsetCookie(BODY_COOKIE_KEY);
-			cookieManager.unsetCookie(CONTENT_TYPE_COOKIE_KEY);
-		}
-
-		let gspResult;
-		if (gspFn) {
-			gspResult = await gspFn(ctx);
-		} else {
-			gspResult = {
-				props: {},
-			};
-		}
-		if ('props' in gspResult) {
-			return {
-				...gspResult,
-				props: {
-					...gspResult.props,
-					req,
-					res,
-				},
-			};
-		}
-
-		// redirect/not found will be treated as default behavior
-		return gspResult;
-	};
-}
-
-export namespace action {
-	export const getApiConfig = (customConfig = {} as PageConfig) => ({
-		api: {
-			...(customConfig.api ?? {}),
-			bodyParser: false,
-		},
-	});
-
-	export interface ActionWrapperOptions {
-		fn: NextApiHandler,
-		deserializers?: EncTypeDeserializerMap,
-		/**
-		 * Maps the Location header from the handler response to an accessible URL.
-		 * @param url
-		 */
-		mapLocationToRedirectDestination?: (referer: string, url: string) => string,
-	}
-
-	export const wrapApiHandler = (
-		options: ActionWrapperOptions,
-	): NextApiHandler => async (req, res) => {
-		const body = await deserializeBody({
-			req,
-			deserializers: options.deserializers,
-		});
-		const reqMut = req as unknown as Record<string, unknown>;
-		reqMut.body = body;
-		return options.fn(reqMut as unknown as DefaultNextApiRequest, res);
-	};
-
-	export const getServerSideProps = (
-		options: ActionWrapperOptions,
-	): GetServerSideProps => async (ctx) => {
-		const { referer = '/' } = ctx.req.headers;
-
-		const mockReq = {
-			...ctx.req,
-			body: await deserializeBody({
-				req: ctx.req,
-				deserializers: options.deserializers,
-			}),
-		} as DefaultNextApiRequest;
-
-		const mockRes = new IceformNextServerResponse(ctx.req);
-		await options.fn(mockReq, mockRes);
-
-		const cookieManager = new CookieManager(ctx);
-		cookieManager.setCookie(STATUS_CODE_COOKIE_KEY, mockRes.statusCode.toString());
-		cookieManager.setCookie(STATUS_MESSAGE_COOKIE_KEY, mockRes.statusMessage);
-		if (mockRes.data) {
-			cookieManager.setCookie(BODY_COOKIE_KEY, mockRes.data as string);
-			if (mockRes.contentType) {
-				cookieManager.setCookie(CONTENT_TYPE_COOKIE_KEY, mockRes.contentType);
-			}
-		}
-		const preventRedirect = (
-			typeof mockReq.body === 'object'
-			&& mockReq.body !== null
-			&& PREVENT_REDIRECT_FORM_KEY in mockReq.body
-		);
-		const redirectDestination = (
-			mockRes.location
-			&& typeof options.mapLocationToRedirectDestination === 'function'
-			&& !preventRedirect
-		)
-			? options.mapLocationToRedirectDestination(referer, mockRes.location)
-			: referer;
-
-		return {
-			redirect: {
-				destination: redirectDestination,
-				statusCode: ACTION_STATUS_CODE,
-			},
-			props: {
-				query: ctx.query,
-				body: mockRes.data,
-			},
-		};
-	};
-}
+export * as action from './action';
+export * as destination from './destination';
diff --git a/packages/iceform-next/src/utils/serialization.ts b/packages/iceform-next/src/utils/serialization.ts
index e4d7afc..4ee17f9 100644
--- a/packages/iceform-next/src/utils/serialization.ts
+++ b/packages/iceform-next/src/utils/serialization.ts
@@ -64,7 +64,7 @@ export const DEFAULT_ENCTYPE_DESERIALIZERS: EncTypeDeserializerMap = {
 	[ENCTYPE_APPLICATION_JSON]: (data: string) => JSON.parse(data) as Record<string, unknown>,
 };
 
-export const deserializeBody = async (params: DeserializeBodyParams) => {
+export const deserializeBody = async (params: DeserializeBodyParams): Promise<unknown> => {
 	const { req, deserializers = DEFAULT_ENCTYPE_DESERIALIZERS } = params;
 	const contentType = req.headers['content-type'] ?? ENCTYPE_APPLICATION_OCTET_STREAM;