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/admin/drive/show-file.ts

@@ -2,6 +2,7 @@ import $ from 'cafy';
 import ID, { transform } from '../../../../../misc/cafy-id';
 import define from '../../../define';
 import DriveFile from '../../../../../models/drive-file';
+import { ApiError } from '../../../error';
 
 export const meta = {
 	requireCredential: true,
@@ -12,17 +13,25 @@ export const meta = {
 			validator: $.type(ID),
 			transform: transform,
 		},
+	},
+
+	errors: {
+		noSuchFile: {
+			message: 'No such file.',
+			code: 'NO_SUCH_FILE',
+			id: 'caf3ca38-c6e5-472e-a30c-b05377dcc240'
+		}
 	}
 };
 
-export default define(meta, (ps, me) => new Promise(async (res, rej) => {
+export default define(meta, async (ps, me) => {
 	const file = await DriveFile.findOne({
 		_id: ps.fileId
 	});
 
 	if (file == null) {
-		return rej('file not found');
+		throw new ApiError(meta.errors.noSuchFile);
 	}
 
-	res(file);
-}));
+	return file;
+});