강력한 API 타입 체크

server/api/base.ts

@@ -1,22 +1,8 @@
 
 import type { Request, Response } from 'express';
-
-export interface ValidResponse {
-    result: true;
-}
-
-export type recoveryMethod = 'refreshEntirePage' | 'retryAPI' | 'gameLogin' | 'gatewayLogin' | 'gatewayPIN';
-
-export interface InvalidResponse {
-    result: false;
-    reason: string;
-    recovery?: recoveryMethod;
-}
+import type { APICallT, Callable, DefAPINamespace, EmptyAPICallT, HttpMethod, InvalidResponse, RawArgType, ValidResponse, recoveryMethod } from '../apiStructure/defs';
 
 export const treatedSpecial = Symbol('treatedSpecial');
-export type HttpMethod = 'get' | 'post' | 'put' | 'delete' | 'patch' | 'head';
-export type RawArgType = Record<string, unknown> | Record<string, unknown>[] | undefined;
-
 export type APINamespace = {
     [key: string]: APINamespace
     | GET<any, any, any>
@@ -29,14 +15,14 @@ export type APINamespace = {
 }
 
 export abstract class APIExecuter<R extends ValidResponse, E extends InvalidResponse, Q extends RawArgType>{
-    readonly abstract reqType: HttpMethod | HttpMethod[];
+    readonly abstract reqType: HttpMethod;
     protected abstract parseQuery(expressReq: Request): Promise<Q>;
-    protected abstract api(query: Q, expressReq: Request, expressRes: Response): Promise<R | E | typeof treatedSpecial>;
+    protected abstract api(query: Q, expressReq: Request, expressRes: Response): Promise<R | E | true>;
     public async run(expressReq: Request, expressRes: Response): Promise<void> {
         const query = await this.parseQuery(expressReq);
         //TODO: middleware (인증, 요구사항, 아마도 decorator)
         const result = await this.api(query, expressReq, expressRes);
-        if (result === treatedSpecial) {
+        if (result === true) {
             return;
         }
         expressRes.json(result);
@@ -77,4 +63,31 @@ export abstract class PATCH<R extends ValidResponse, E extends InvalidResponse,
 
 export abstract class HEAD<R extends ValidResponse, E extends InvalidResponse, Q extends RawArgType> extends APIBodyParseExecuter<R, E, Q>{
     readonly reqType = 'head';
-}
+}
+
+export function raiseError(reason: string, recovery?: recoveryMethod): InvalidResponse {
+    if (recovery) {
+        return {
+            result: false,
+            reason,
+            recovery,
+        };
+    }
+    return {
+        result: false,
+        reason,
+    };
+}
+
+export type GetClassGenerator<T> = {
+    prototype: T
+};
+export type APIServerType<T extends Callable> =
+    T extends APICallT<infer Q, infer R, infer E> ? GetClassGenerator<APIExecuter<R, E, Q>> :
+    never;
+export type APINamespaceType<T extends DefAPINamespace> = {
+    [K in keyof T]:
+    T[K] extends Callable ? APIServerType<T[K]> :
+    T[K] extends DefAPINamespace ? APINamespaceType<T[K]> :
+    never;
+};