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* Shared request handler for API routes
* Used by both dev server and preview/production server
*/
import type { IncomingMessage, ServerResponse } from 'http';
import type { Connect } from 'vite';
import { matchRoute } from '../routing/route-matcher.js';
import { createContext, isVitekResponse, type VitekResponse } from '../context/create-context.js';
import { getApplicableMiddlewares } from '../middleware/get-applicable-middlewares.js';
import { compose } from '../middleware/compose.js';
import { API_BASE_PATH } from '../../shared/constants.js';
import { HttpError } from '../../shared/errors.js';
import type { Route } from '../routing/route-types.js';
import type { LoadedMiddleware } from '../middleware/get-applicable-middlewares.js';
import type { SocketEmitter } from '../shared/vitek-app.js';
import {
normalizeCorsOptions,
getCorsHeaders,
type NormalizedCorsOptions,
} from './cors.js';
import { getEffectiveRequest } from './proxy.js';
/** Callback for beforeApiRequest hook. Call next() to continue, or send response and return without next() to short-circuit. */
export type BeforeApiRequestHook = (
ctx: { req: IncomingMessage; res: ServerResponse; path: string; method: string },
next: () => void
) => void | Promise<void>;
export interface RequestHandlerOptions {
routes: Route[];
middlewares: LoadedMiddleware[];
/** Hooks called before each API request. Call next() to continue. */
beforeApiRequest?: BeforeApiRequestHook[];
/** Enable CORS. true or CorsOptions. When set, OPTIONS preflight and CORS headers on responses are handled. */
cors?: boolean | import('./cors.js').CorsOptions;
/** When true, trust X-Forwarded-* headers and set context.clientIp / effective url. */
trustProxy?: boolean;
logger?: {
routeMatched?(pattern: string, method: string): void;
requestStart?(method: string, path: string): void;
request?(method: string, path: string, statusCode: number, duration?: number): void;
warn?(message: string, data?: Record<string, unknown>): void;
error?(message: string, data?: Record<string, unknown>): void;
};
/** When provided, context.sockets is set so route handlers can emit to WebSocket clients. */
shared?: { sockets: SocketEmitter };
/** Max request body size in bytes. When exceeded, responds with 413 Payload Too Large. Omit for no limit. */
maxBodySize?: number;
/** Called when a non-HttpError is thrown. May send a custom response; if res is not ended, default 500 JSON is sent. */
onError?: (err: Error, req: IncomingMessage, res: ServerResponse) => void | Promise<void>;
}
const noop = () => {};
function sanitizeHeaderValue(value: string | number | string[]): string {
const s = Array.isArray(value)
? value.map((v) => String(v).replace(/\r|\n/g, '')).join(', ')
: String(value).replace(/\r|\n/g, '');
return s;
}
function safeSetHeader(res: ServerResponse, key: string, value: string | number | string[]): void {
res.setHeader(key, sanitizeHeaderValue(value));
}
/** True if value is a Node.js Readable stream (has .pipe). Used for streaming response body. */
function isReadableStream(value: unknown): value is NodeJS.ReadableStream {
return (
value != null &&
typeof value === 'object' &&
typeof (value as NodeJS.ReadableStream).pipe === 'function'
);
}
function applyCorsHeaders(res: ServerResponse, corsHeaders: Record<string, string>): void {
for (const [key, value] of Object.entries(corsHeaders)) {
safeSetHeader(res, key, value);
}
}
export function createRequestHandler(options: RequestHandlerOptions): (req: IncomingMessage, res: ServerResponse, next: Connect.NextFunction) => Promise<void> {
const { routes, middlewares, beforeApiRequest = [], cors, trustProxy = false, logger, shared, maxBodySize, onError } = options;
const corsOpts: NormalizedCorsOptions | null = cors != null ? normalizeCorsOptions(cors) : null;
const logRouteMatched = logger?.routeMatched ?? noop;
const logRequestStart = logger?.requestStart ?? noop;
const logRequest = logger?.request ?? noop;
const logWarn = logger?.warn ?? noop;
const logError = logger?.error ?? noop;
return async (req: IncomingMessage, res: ServerResponse, next: Connect.NextFunction) => {
if (!req.url) return next();
const pathname = req.url.split('?')[0];
if (pathname !== API_BASE_PATH && !pathname.startsWith(API_BASE_PATH + '/')) {
return next();
}
const startTime = Date.now();
const requestMethod = req.method?.toLowerCase() || 'get';
const requestPath = pathname;
const effective = getEffectiveRequest(req, trustProxy);
const requestUrl = effective.url || req.url;
if (corsOpts) {
const corsHeaders = getCorsHeaders(req, corsOpts);
applyCorsHeaders(res, corsHeaders);
if (req.method === 'OPTIONS') {
res.statusCode = 204;
res.end();
return;
}
}
try {
const url = new URL(requestUrl, 'http://localhost');
const routePath = url.pathname.replace(API_BASE_PATH, '') || '/';
const method = requestMethod;
const doHandleRequest = async () => {
const match = matchRoute(routes, routePath, method);
if (!match) {
const duration = Date.now() - startTime;
res.statusCode = 404;
safeSetHeader(res, 'Content-Type', 'application/json');
Iif (corsOpts) applyCorsHeaders(res, getCorsHeaders(req, corsOpts));
res.end(JSON.stringify({ error: 'Route not found' }));
logRequest(requestMethod, requestPath, 404, duration);
return;
}
logRouteMatched(match.route.pattern, method);
logRequestStart(requestMethod, requestPath);
const query: Record<string, string | string[]> = {};
url.searchParams.forEach((value, key) => {
Iif (query[key]) {
const existing = query[key];
query[key] = Array.isArray(existing) ? [...existing, value] : [existing as string, value];
} else {
query[key] = value;
}
});
const PAYLOAD_TOO_LARGE_SENTINEL = Symbol('PAYLOAD_TOO_LARGE');
let body: unknown;
if (['post', 'put', 'patch'].includes(method)) {
body = await new Promise<unknown>((resolve, reject) => {
const chunks: Buffer[] = [];
let totalSize = 0;
const onData = (chunk: Buffer) => {
if (maxBodySize != null) {
totalSize += chunk.length;
if (totalSize > maxBodySize) {
req.removeListener('data', onData);
req.removeListener('end', onEnd);
req.destroy();
reject(new Error('PAYLOAD_TOO_LARGE'));
return;
}
}
chunks.push(chunk);
};
const onEnd = () => {
const rawBody = Buffer.concat(chunks).toString();
Iif (!rawBody) {
resolve(undefined);
return;
}
try {
resolve(JSON.parse(rawBody));
} catch {
resolve(rawBody);
}
};
req.on('data', onData);
req.on('end', onEnd);
}).catch((err) => {
Eif (err?.message === 'PAYLOAD_TOO_LARGE') {
const duration = Date.now() - startTime;
res.statusCode = 413;
safeSetHeader(res, 'Content-Type', 'application/json');
Iif (corsOpts) applyCorsHeaders(res, getCorsHeaders(req, corsOpts));
res.end(JSON.stringify({ error: 'Payload Too Large' }));
logRequest(requestMethod, requestPath, 413, duration);
return PAYLOAD_TOO_LARGE_SENTINEL;
}
throw err;
});
if (body === PAYLOAD_TOO_LARGE_SENTINEL) return;
}
const context = createContext(
{
url: requestUrl,
method,
headers: (req.headers || {}) as Record<string, string>,
body,
},
match.params,
query
);
if (effective.clientIp) context.clientIp = effective.clientIp;
if (shared?.sockets) {
context.sockets = shared.sockets;
}
const applicableMiddlewares = getApplicableMiddlewares(middlewares, match.route.pattern);
const composed = compose(applicableMiddlewares);
const handler = async () => {
const result = await match.route.handler(context);
if (isVitekResponse(result)) {
const response = result as VitekResponse;
const statusCode = response.status || 200;
Iif (corsOpts) applyCorsHeaders(res, getCorsHeaders(req, corsOpts));
if (response.headers) {
for (const [key, value] of Object.entries(response.headers)) {
safeSetHeader(res, key, value);
}
}
if (!response.headers || !response.headers['Content-Type']) {
if (response.body !== undefined && !isReadableStream(response.body)) {
safeSetHeader(res, 'Content-Type', 'application/json');
}
}
res.statusCode = statusCode;
if (response.body === undefined) {
res.end();
logRequest(requestMethod, requestPath, statusCode, Date.now() - startTime);
} else if (isReadableStream(response.body)) {
const stream = response.body as NodeJS.ReadableStream;
res.once('finish', () =>
logRequest(requestMethod, requestPath, statusCode, Date.now() - startTime)
);
stream.pipe(res as NodeJS.WritableStream);
} else if (typeof response.body === 'string') {
res.end(response.body);
logRequest(requestMethod, requestPath, statusCode, Date.now() - startTime);
} else {
res.end(JSON.stringify(response.body));
logRequest(requestMethod, requestPath, statusCode, Date.now() - startTime);
}
} else {
if (corsOpts) applyCorsHeaders(res, getCorsHeaders(req, corsOpts));
safeSetHeader(res, 'Content-Type', 'application/json');
res.statusCode = 200;
res.end(JSON.stringify(result));
logRequest(requestMethod, requestPath, 200, Date.now() - startTime);
}
};
await composed(context, handler);
};
Iif (beforeApiRequest.length > 0) {
for (const hook of beforeApiRequest) {
await new Promise<void>((resolve, reject) => {
let done = false;
const next = () => { if (!done) { done = true; resolve(); } };
Promise.resolve(hook({ req, res, path: routePath, method }, next))
.then(() => { if (!done && res.writableEnded) { done = true; resolve(); } })
.catch(reject);
});
if (res.writableEnded) return;
}
}
await doHandleRequest();
} catch (error) {
const duration = Date.now() - startTime;
Iif (corsOpts) applyCorsHeaders(res, getCorsHeaders(req, corsOpts));
if (error instanceof HttpError) {
const httpError = error as HttpError;
logWarn(`HTTP Error ${httpError.statusCode}: ${httpError.message}`);
res.statusCode = httpError.statusCode;
safeSetHeader(res, 'Content-Type', 'application/json');
res.end(
JSON.stringify({
error: httpError.name,
message: httpError.message,
code: httpError.code,
})
);
logRequest(requestMethod, requestPath, httpError.statusCode, duration);
} else {
const err = error instanceof Error ? error : new Error(String(error));
if (onError) {
await Promise.resolve(onError(err, req, res));
if (res.writableEnded) {
logRequest(requestMethod, requestPath, res.statusCode, duration);
return;
}
}
const errorMessage = err.message;
logError(`Error handling request: ${errorMessage}`);
res.statusCode = 500;
safeSetHeader(res, 'Content-Type', 'application/json');
res.end(
JSON.stringify({
error: 'Internal server error',
message: errorMessage,
})
);
logRequest(requestMethod, requestPath, 500, duration);
}
}
};
}
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