refactoring

Resolve #7779

packages/backend/src/server/api/api-handler.ts

@@ -0,0 +1,51 @@
+import * as Koa from 'koa';
+
+import { IEndpoint } from './endpoints';
+import authenticate, { AuthenticationError } from './authenticate';
+import call from './call';
+import { ApiError } from './error';
+
+export default (endpoint: IEndpoint, ctx: Koa.Context) => new Promise((res) => {
+	const body = ctx.request.body;
+
+	const reply = (x?: any, y?: ApiError) => {
+		if (x == null) {
+			ctx.status = 204;
+		} else if (typeof x === 'number' && y) {
+			ctx.status = x;
+			ctx.body = {
+				error: {
+					message: y!.message,
+					code: y!.code,
+					id: y!.id,
+					kind: y!.kind,
+					...(y!.info ? { info: y!.info } : {})
+				}
+			};
+		} else {
+			// 文字列を返す場合は、JSON.stringify通さないとJSONと認識されない
+			ctx.body = typeof x === 'string' ? JSON.stringify(x) : x;
+		}
+		res();
+	};
+
+	// Authentication
+	authenticate(body['i']).then(([user, app]) => {
+		// API invoking
+		call(endpoint.name, user, app, body, (ctx as any).file).then((res: any) => {
+			reply(res);
+		}).catch((e: ApiError) => {
+			reply(e.httpStatusCode ? e.httpStatusCode : e.kind === 'client' ? 400 : 500, e);
+		});
+	}).catch(e => {
+		if (e instanceof AuthenticationError) {
+			reply(403, new ApiError({
+				message: 'Authentication failed. Please ensure your token is correct.',
+				code: 'AUTHENTICATION_FAILED',
+				id: 'b0a7f5f8-dc2f-4171-b91f-de88ad238e14'
+			}));
+		} else {
+			reply(500, new ApiError());
+		}
+	});
+});