From e542a030e4fc43e9842d0a006bdcf206441f62be Mon Sep 17 00:00:00 2001
From: Kagami Sascha Rosylight <saschanaz@outlook.com>
Date: Sun, 19 Mar 2023 12:27:17 +0100
Subject: [PATCH] =?UTF-8?q?fix(backend/URLPreviewService):=20=E3=82=A8?=
 =?UTF-8?q?=E3=83=A9=E3=83=BC=E3=81=A7HTTP=20422=E3=82=92=E5=87=BA?=
 =?UTF-8?q?=E3=81=99=E3=82=88=E3=81=86=E3=81=AB=20(#10339)?=
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* fix(backend/URLPreviewService): エラーでHTTP 402を出すように

* fix import
---
 .../src/server/web/UrlPreviewService.ts        | 18 ++++++++++++------
 packages/backend/test/e2e/endpoints.ts         |  8 ++++++++
 2 files changed, 20 insertions(+), 6 deletions(-)

diff --git a/packages/backend/src/server/web/UrlPreviewService.ts b/packages/backend/src/server/web/UrlPreviewService.ts
index 21cf414087..b3e193cd34 100644
--- a/packages/backend/src/server/web/UrlPreviewService.ts
+++ b/packages/backend/src/server/web/UrlPreviewService.ts
@@ -1,7 +1,6 @@
 import { Inject, Injectable } from '@nestjs/common';
 import { summaly } from 'summaly';
 import { DI } from '@/di-symbols.js';
-import type { UsersRepository } from '@/models/index.js';
 import type { Config } from '@/config.js';
 import { MetaService } from '@/core/MetaService.js';
 import { HttpRequestService } from '@/core/HttpRequestService.js';
@@ -9,6 +8,7 @@ import type Logger from '@/logger.js';
 import { query } from '@/misc/prelude/url.js';
 import { LoggerService } from '@/core/LoggerService.js';
 import { bindThis } from '@/decorators.js';
+import { ApiError } from '@/server/api/error.js';
 import type { FastifyRequest, FastifyReply } from 'fastify';
 
 @Injectable()
@@ -40,9 +40,9 @@ export class UrlPreviewService {
 
 	@bindThis
 	public async handle(
-		request: FastifyRequest<{ Querystring: { url: string; lang: string; } }>,
+		request: FastifyRequest<{ Querystring: { url: string; lang?: string; } }>,
 		reply: FastifyReply,
-	) {
+	): Promise<object | undefined> {
 		const url = request.query.url;
 		if (typeof url !== 'string') {
 			reply.code(400);
@@ -78,7 +78,7 @@ export class UrlPreviewService {
 
 			this.logger.succ(`Got preview of ${url}: ${summary.title}`);
 
-			if (summary.url && !(summary.url.startsWith('http://') || summary.url.startsWith('https://'))) {
+			if (!(summary.url.startsWith('http://') || summary.url.startsWith('https://'))) {
 				throw new Error('unsupported schema included');
 			}
 
@@ -95,9 +95,15 @@ export class UrlPreviewService {
 			return summary;
 		} catch (err) {
 			this.logger.warn(`Failed to get preview of ${url}: ${err}`);
-			reply.code(200);
+			reply.code(422);
 			reply.header('Cache-Control', 'max-age=86400, immutable');
-			return {};
+			return {
+				error: new ApiError({
+					message: 'Failed to get preview',
+					code: 'URL_PREVIEW_FAILED',
+					id: '09d01cb5-53b9-4856-82e5-38a50c290a3b',
+				}),
+			};
 		}
 	}
 }
diff --git a/packages/backend/test/e2e/endpoints.ts b/packages/backend/test/e2e/endpoints.ts
index cbe7b894f4..0a45a320f9 100644
--- a/packages/backend/test/e2e/endpoints.ts
+++ b/packages/backend/test/e2e/endpoints.ts
@@ -841,4 +841,12 @@ describe('Endpoints', () => {
 			assert.strictEqual(res.body[0].id, carolPost.id);
 		});
 	});
+
+	describe('URL preview', () => {
+		test('Error from summaly becomes HTTP 422', async () => {
+			const res = await simpleGet('/url?url=https://e:xample.com');
+			assert.strictEqual(res.status, 422);
+			assert.strictEqual(res.body.error.code, 'URL_PREVIEW_FAILED');
+		});
+	});
 });