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Copy pathdtryx.ts
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272 lines (266 loc) · 8.75 KB
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/** 고정 공개 API만 허용하는 디트릭스 전용 중계입니다. */
import { randomUUID, timingSafeEqual } from 'node:crypto';
import { DTRYX_API } from '../../src/services/dtryx/api.js';
type Route = 'timetable' | 'play-dates' | 'movies';
interface Params {
brandCode: string;
cinemaCode: string;
playDate?: string;
}
interface Options {
takeQuota: () => Promise<boolean>;
fetcher?: typeof fetch;
onEvent?: (event: {
stage: string;
operation: string;
requestId: string;
outcome: string;
status: number;
durationMs: number;
}) => void | Promise<void>;
}
class RelayError extends Error {
constructor(readonly status: number) {
super('Relay failure');
}
}
const reply = (status: number, body: unknown) =>
Response.json(body, {
status,
headers: { 'Cache-Control': 'no-store' },
});
/** 취소 신호를 무시하는 외부 처리도 기한 안에 반환합니다. */
function abortable<T>(task: Promise<T>, signal: AbortSignal): Promise<T> {
return new Promise((resolve, reject) => {
const abort = () => reject(new RelayError(499));
task.then(resolve, reject).finally(() => signal.removeEventListener('abort', abort));
if (signal.aborted) {
reject(new RelayError(499));
return;
}
signal.addEventListener('abort', abort, { once: true });
});
}
async function readJson(
body: ReadableStream<Uint8Array> | null,
limit: number,
signal: AbortSignal,
status: number,
): Promise<unknown> {
if (!body) throw new RelayError(status);
const reader = body.getReader();
const chunks: Uint8Array[] = [];
let bytes = 0;
try {
while (true) {
const { value, done } = await abortable(reader.read(), signal);
if (done) break;
bytes += value.byteLength;
if (bytes > limit) throw new RelayError(status === 400 ? 413 : status);
chunks.push(value);
}
return JSON.parse(Buffer.concat(chunks).toString('utf8'));
} catch (error) {
if (error instanceof RelayError) throw error;
throw new RelayError(status);
} finally {
void reader.cancel().catch(() => undefined);
}
}
function validate(value: unknown, route: Route): Params {
if (!value || typeof value !== 'object' || Array.isArray(value)) throw new RelayError(400);
const p = value as Record<string, unknown>;
const keys =
route === 'timetable' ? ['brandCode', 'cinemaCode', 'playDate'] : ['brandCode', 'cinemaCode'];
if (
Object.keys(p).length !== keys.length ||
!Object.keys(p).every((key) => keys.includes(key)) ||
typeof p.brandCode !== 'string' ||
!/^[a-z][a-z0-9_-]{0,31}$/.test(p.brandCode) ||
typeof p.cinemaCode !== 'string' ||
!/^\d{6}$/.test(p.cinemaCode)
)
throw new RelayError(400);
if (route === 'timetable') {
if (typeof p.playDate !== 'string' || !/^\d{8}$/.test(p.playDate)) throw new RelayError(400);
const dashed = `${p.playDate.slice(0, 4)}-${p.playDate.slice(4, 6)}-${p.playDate.slice(6, 8)}`;
const time = Date.parse(`${dashed}T00:00:00Z`);
if (!Number.isFinite(time) || new Date(time).toISOString().slice(0, 10) !== dashed)
throw new RelayError(400);
}
return p as unknown as Params;
}
async function upstream(route: Route, p: Params, signal: AbortSignal, fetcher: typeof fetch) {
const key =
route === 'timetable' ? 'TIMETABLE_LIST' : route === 'movies' ? 'MOVIE_NOW' : 'PLAY_DATE_LIST';
const url = new URL(
`${DTRYX_API.THIRDPARTY_PATH}/${DTRYX_API.ENDPOINTS[key]}`,
DTRYX_API.BASE_URL,
);
url.search = new URLSearchParams({
ChannelCd: DTRYX_API.CHANNEL_CODE,
EngVerYn: 'N',
WorkGuID: DTRYX_API.WORK_GUIDS[key],
BrandCd: p.brandCode,
CinemaCd: p.cinemaCode,
}).toString();
if (route === 'timetable') {
const date = p.playDate as string;
url.searchParams.set('PlaySDT', `${date.slice(0, 4)}-${date.slice(4, 6)}-${date.slice(6, 8)}`);
}
url.searchParams.set(
route === 'play-dates' ? 'MovieCd' : 'ImgSize',
route === 'play-dates' ? '' : 'small',
);
const response = await abortable(
fetcher(url, {
method: 'GET',
redirect: 'manual',
signal,
headers: { Accept: 'application/json' },
}),
signal,
);
if (response.status !== 200) {
void response.body?.cancel().catch(() => undefined);
throw new RelayError(502);
}
const data = await readJson(response.body, 2 * 1024 * 1024, signal, 502);
if (
!data ||
typeof data !== 'object' ||
Array.isArray(data) ||
!('RetCode' in data) ||
data.RetCode !== 'success' ||
!('Recordset' in data) ||
!Array.isArray(data.Recordset) ||
!data.Recordset.every(
(item) => item !== null && typeof item === 'object' && !Array.isArray(item),
)
) {
throw new RelayError(502);
}
return data;
}
export function createDtryxRelay(token: string, options: Options) {
if (!token.trim()) throw new Error('DTRYX_RELAY_TOKEN is required');
const secret = Buffer.from(`Bearer ${token}`);
const fetcher = options.fetcher ?? fetch;
let outstanding = 0;
let active = 0;
const queue: Array<() => void> = [];
function acquire(signal: AbortSignal): Promise<void> {
if (signal.aborted) return Promise.reject(new RelayError(499));
if (active < 4) {
active++;
return Promise.resolve();
}
return new Promise((resolve, reject) => {
const start = () => {
signal.removeEventListener('abort', abort);
active++;
resolve();
};
const abort = () => {
queue.splice(queue.indexOf(start), 1);
reject(new RelayError(499));
};
signal.addEventListener('abort', abort, { once: true });
queue.push(start);
});
}
return async (request: Request): Promise<Response> => {
const authorization = Buffer.from(request.headers.get('authorization') ?? '');
if (authorization.length !== secret.length || !timingSafeEqual(authorization, secret))
return reply(401, { error: 'Unauthorized' });
const url = new URL(request.url);
if (url.pathname === '/v1/dtryx/health' && request.method === 'GET' && !url.search)
return reply(200, { status: 'ok', active, outstanding, queued: queue.length });
const name = url.pathname.slice('/v1/dtryx/'.length);
if (
!url.pathname.startsWith('/v1/dtryx/') ||
!['timetable', 'play-dates', 'movies'].includes(name) ||
url.search
)
return reply(404, { error: 'Not found' });
if (request.method !== 'POST') return reply(405, { error: 'Method not allowed' });
if (outstanding >= 32) return reply(503, { error: 'Relay busy' });
outstanding++;
const deadline = performance.now() + 15000;
const controller = new AbortController();
const abort = () => controller.abort();
request.signal.addEventListener('abort', abort, { once: true });
if (request.signal.aborted) abort();
let expired = false;
const timer = setTimeout(() => {
expired = true;
abort();
}, 15000);
let acquired = false;
let stage = 'body';
let resultStatus = 200;
const suppliedId = request.headers.get('x-request-id');
const requestId =
suppliedId && /^[A-Za-z0-9_-]{1,64}$/.test(suppliedId) ? suppliedId : randomUUID();
try {
const p = validate(
await readJson(request.body, 16384, controller.signal, 400),
name as Route,
);
stage = 'queue';
await acquire(controller.signal);
acquired = true;
if (performance.now() >= deadline) {
expired = true;
abort();
}
controller.signal.throwIfAborted();
stage = 'quota';
if (
!(await abortable(
options.takeQuota().catch(() => {
throw new RelayError(503);
}),
controller.signal,
))
)
throw new RelayError(429);
controller.signal.throwIfAborted();
stage = 'upstream';
return reply(200, await upstream(name as Route, p, controller.signal, fetcher));
} catch (error) {
const status = expired
? 504
: controller.signal.aborted
? 499
: error instanceof RelayError
? error.status
: 502;
resultStatus = status;
return reply(status, { error: 'Relay request failed' });
} finally {
try {
void Promise.resolve(
options.onEvent?.({
stage,
operation: name,
requestId,
outcome: resultStatus === 200 ? 'ok' : 'error',
status: resultStatus,
durationMs: performance.now() - deadline + 15000,
}),
).catch(() => undefined);
} catch {
/* 관측 실패는 요청에 영향을 주지 않습니다. */
}
clearTimeout(timer);
request.signal.removeEventListener('abort', abort);
controller.abort();
outstanding--;
if (acquired) {
active--;
queue.shift()?.();
}
}
};
}