Improve error handling of API (#4345)

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* Update attached_notes.ts

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* Refactor

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* Update call.ts

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* ✌️

* Fix

src/server/api/endpoints/app/create.ts

@@ -27,7 +27,7 @@ export const meta = {
 	}
 };
 
-export default define(meta, (ps, user) => new Promise(async (res, rej) => {
+export default define(meta, async (ps, user) => {
 	// Generate secret
 	const secret = rndstr('a-zA-Z0-9', 32);
 
@@ -42,9 +42,8 @@ export default define(meta, (ps, user) => new Promise(async (res, rej) => {
 		secret: secret
 	});
 
-	// Response
-	res(await pack(app, null, {
+	return await pack(app, null, {
 		detail: true,
 		includeSecret: true
-	}));
-}));
+	});
+});

src/server/api/endpoints/app/show.ts

@@ -2,6 +2,7 @@ import $ from 'cafy';
 import ID, { transform } from '../../../../misc/cafy-id';
 import App, { pack } from '../../../../models/app';
 import define from '../../define';
+import { ApiError } from '../../error';
 
 export const meta = {
 	params: {
@@ -9,22 +10,29 @@ export const meta = {
 			validator: $.type(ID),
 			transform: transform
 		},
+	},
+
+	errors: {
+		noSuchApp: {
+			message: 'No such app.',
+			code: 'NO_SUCH_APP',
+			id: 'dce83913-2dc6-4093-8a7b-71dbb11718a3'
+		}
 	}
 };
 
-export default define(meta, (ps, user, app) => new Promise(async (res, rej) => {
+export default define(meta, async (ps, user, app) => {
 	const isSecure = user != null && app == null;
 
 	// Lookup app
 	const ap = await App.findOne({ _id: ps.appId });
 
 	if (ap === null) {
-		return rej('app not found');
+		throw new ApiError(meta.errors.noSuchApp);
 	}
 
-	// Send response
-	res(await pack(ap, user, {
+	return await pack(ap, user, {
 		detail: true,
 		includeSecret: isSecure && ap.userId.equals(user._id)
-	}));
-}));
+	});
+});