fix(backend): ダイレクトなノートに対してはダイレクトでしか返信できないように (#13477)

* fix(backend): ダイレクトなノートに対してはダイレクトでしか返信できないように

* Update CHANGELOG.md

* test(backend): `notes/create`とWebSocket関連のテストを追加

3 files changed, 129 insertions, 0 deletions

diff --git a/packages/backend/src/server/api/endpoints/notes/create.ts b/packages/backend/src/server/api/endpoints/notes/create.ts
index 2fa0bd099f..27463577fe 100644
--- a/packages/backend/src/server/api/endpoints/notes/create.ts
+++ b/packages/backend/src/server/api/endpoints/notes/create.ts
@@ -85,6 +85,12 @@ export const meta = {
 			id: '3ac74a84-8fd5-4bb0-870f-01804f82ce15',
 		},
 
+		cannotReplyToSpecifiedVisibilityNoteWithExtendedVisibility: {
+			message: 'You cannot reply to a specified visibility note with extended visibility.',
+			code: 'CANNOT_REPLY_TO_SPECIFIED_VISIBILITY_NOTE_WITH_EXTENDED_VISIBILITY',
+			id: 'ed940410-535c-4d5e-bfa3-af798671e93c',
+		},
+
 		cannotCreateAlreadyExpiredPoll: {
 			message: 'Poll is already expired.',
 			code: 'CANNOT_CREATE_ALREADY_EXPIRED_POLL',
@@ -313,6 +319,8 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 					throw new ApiError(meta.errors.cannotReplyToPureRenote);
 				} else if (!await this.noteEntityService.isVisibleForMe(reply, me.id)) {
 					throw new ApiError(meta.errors.cannotReplyToInvisibleNote);
+				} else if (reply.visibility === 'specified' && ps.visibility !== 'specified') {
+					throw new ApiError(meta.errors.cannotReplyToSpecifiedVisibilityNoteWithExtendedVisibility);
 				}
 
 				// Check blocking
diff --git a/packages/backend/test/e2e/note.ts b/packages/backend/test/e2e/note.ts
index a5742d6e77..23de94889d 100644
--- a/packages/backend/test/e2e/note.ts
+++ b/packages/backend/test/e2e/note.ts
@@ -176,6 +176,87 @@ describe('Note', () => {
 		assert.strictEqual(deleteRes.status, 204);
 	});
 
+	test('visibility: followersなノートに対してフォロワーはリプライできる', async () => {
+		await api('/following/create', {
+			userId: alice.id,
+		}, bob);
+
+		const aliceNote = await api('/notes/create', {
+			text: 'direct note to bob',
+			visibility: 'followers',
+		}, alice);
+
+		assert.strictEqual(aliceNote.status, 200);
+
+		const replyId = aliceNote.body.createdNote.id;
+		const bobReply = await api('/notes/create', {
+			text: 'reply to alice note',
+			replyId,
+		}, bob);
+
+		assert.strictEqual(bobReply.status, 200);
+		assert.strictEqual(bobReply.body.createdNote.replyId, replyId);
+
+		await api('/following/delete', {
+			userId: alice.id,
+		}, bob);
+	});
+
+	test('visibility: followersなノートに対してフォロワーでないユーザーがリプライしようとすると怒られる', async () => {
+		const aliceNote = await api('/notes/create', {
+			text: 'direct note to bob',
+			visibility: 'followers',
+		}, alice);
+
+		assert.strictEqual(aliceNote.status, 200);
+
+		const bobReply = await api('/notes/create', {
+			text: 'reply to alice note',
+			replyId: aliceNote.body.createdNote.id,
+		}, bob);
+
+		assert.strictEqual(bobReply.status, 400);
+		assert.strictEqual(bobReply.body.error.code, 'CANNOT_REPLY_TO_AN_INVISIBLE_NOTE');
+	});
+
+	test('visibility: specifiedなノートに対してvisibility: specifiedで返信できる', async () => {
+		const aliceNote = await api('/notes/create', {
+			text: 'direct note to bob',
+			visibility: 'specified',
+			visibleUserIds: [bob.id],
+		}, alice);
+
+		assert.strictEqual(aliceNote.status, 200);
+
+		const bobReply = await api('/notes/create', {
+			text: 'reply to alice note',
+			replyId: aliceNote.body.createdNote.id,
+			visibility: 'specified',
+			visibleUserIds: [alice.id],
+		}, bob);
+
+		assert.strictEqual(bobReply.status, 200);
+	});
+
+	test('visibility: specifiedなノートに対してvisibility: follwersで返信しようとすると怒られる', async () => {
+		const aliceNote = await api('/notes/create', {
+			text: 'direct note to bob',
+			visibility: 'specified',
+			visibleUserIds: [bob.id],
+		}, alice);
+
+		assert.strictEqual(aliceNote.status, 200);
+
+		const bobReply = await api('/notes/create', {
+			text: 'reply to alice note with visibility: followers',
+			replyId: aliceNote.body.createdNote.id,
+			visibility: 'followers',
+		}, bob);
+
+		assert.strictEqual(bobReply.status, 400);
+		assert.strictEqual(bobReply.body.error.code, 'CANNOT_REPLY_TO_SPECIFIED_VISIBILITY_NOTE_WITH_EXTENDED_VISIBILITY');
+	});
+
 	test('文字数ぎりぎりで怒られない', async () => {
 		const post = {
 			text: '!'.repeat(MAX_NOTE_TEXT_LENGTH), // 3000文字
diff --git a/packages/backend/test/e2e/streaming.ts b/packages/backend/test/e2e/streaming.ts
index 13d5a683ba..57ce73ba60 100644
--- a/packages/backend/test/e2e/streaming.ts
+++ b/packages/backend/test/e2e/streaming.ts
@@ -227,6 +227,46 @@ describe('Streaming', () => {
 				assert.strictEqual(fired, false);
 			});
 
+			/**
+			 * TODO: 落ちる
+			 * @see https://github.com/misskey-dev/misskey/issues/13474
+			test('visibility: specified なノートで visibleUserIds に自分が含まれているときそのノートへのリプライが流れてくる', async () => {
+				const chitoseToKyokoAndAyano = await post(chitose, { text: 'direct note from chitose to kyoko and ayano', visibility: 'specified', visibleUserIds: [kyoko.id, ayano.id] });
+
+				const fired = await waitFire(
+					ayano, 'homeTimeline',	// ayano:home
+					() => api('notes/create', { text: 'direct reply from kyoko to chitose and ayano', replyId: chitoseToKyokoAndAyano.id, visibility: 'specified', visibleUserIds: [chitose.id, ayano.id] }, kyoko),
+					msg => msg.type === 'note' && msg.body.userId === kyoko.id,
+				);
+
+				assert.strictEqual(fired, true);
+			});
+			 */
+
+			test('visibility: specified な投稿に対するリプライで visibleUserIds が拡張されたとき、その拡張されたユーザーの HTL にはそのリプライが流れない', async () => {
+				const chitoseToKyoko = await post(chitose, { text: 'direct note from chitose to kyoko', visibility: 'specified', visibleUserIds: [kyoko.id] });
+
+				const fired = await waitFire(
+					ayano, 'homeTimeline',	// ayano:home
+					() => api('notes/create', { text: 'direct reply from kyoko to chitose and ayano', replyId: chitoseToKyoko.id, visibility: 'specified', visibleUserIds: [chitose.id, ayano.id] }, kyoko),
+					msg => msg.type === 'note' && msg.body.userId === kyoko.id,
+				);
+
+				assert.strictEqual(fired, false);
+			});
+
+			test('visibility: specified な投稿に対するリプライで visibleUserIds が収縮されたとき、その収縮されたユーザーの HTL にはそのリプライが流れない', async () => {
+				const chitoseToKyokoAndAyano = await post(chitose, { text: 'direct note from chitose to kyoko and ayano', visibility: 'specified', visibleUserIds: [kyoko.id, ayano.id] });
+
+				const fired = await waitFire(
+					ayano, 'homeTimeline',	// ayano:home
+					() => api('notes/create', { text: 'direct reply from kyoko to chitose', replyId: chitoseToKyokoAndAyano.id, visibility: 'specified', visibleUserIds: [chitose.id] }, kyoko),
+					msg => msg.type === 'note' && msg.body.userId === kyoko.id,
+				);
+
+				assert.strictEqual(fired, false);
+			});
+
 			test('withRenotes: false のときリノートが流れない', async () => {
 				const fired = await waitFire(
 					ayano, 'homeTimeline',	// ayano:home