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fix(dm): enforce read-only guard on DM reactions (WS) + harden purge/ownership tests

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Finding 1: handleReactionAdd/Remove now drop reactions on a dead 1-on-1
(isDeadOneOnOne) — previously a survivor could react on a Deleted-User
thread and the relay fanned out to all peers via undefined target-origins.
Client Message.tsx withdraws add/toggle reaction affordances for dead DMs
(existing reactions still display read-only).

Finding 2: dmMembership purge test now runs with foreign_keys=ON (matches
prod) and asserts dm_members/dm_messages cascade cleanup on channel purge.

Finding 3: tombstone group-DM ownership transfer filters isDeleted=0 so
ownership can never move to a tombstoned member; covered by a new test.
This commit is contained in:
Jannis Braun
2026-07-02 16:45:44 +02:00
parent e4e83eb3fb
commit 1629f8fbe1
6 changed files with 105 additions and 4 deletions
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packages/web/src/components/chat/Message.tsx
+15 -1
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@@ -16,6 +16,7 @@ import { EmbedRenderer } from './EmbedRenderer';
import { Username } from '../ui/Username';
import { EmojiPicker } from './EmojiPicker';
import { hasPermissionBit, PermissionBits } from '../../utils/permissions';
import { isDeletedPartnerDm } from '../../utils/dmFormatters';
import { isSelf, resolveDisplayIdentity } from '../../utils/identity';
import { useCanonicalUserView } from '../../utils/userViewLookup';
import {
@@ -161,10 +162,21 @@ export function Message({ message, isCompact, isFirstInGroup, previousMessageId
const isDmMessage = isPendingMessage(message)
? !!message.dmChannelId || !message.channelId
: !!(message as MessageWithUser & { dmChannelId?: string }).dmChannelId || !message.channelId;
const dmChannelId = isPendingMessage(message)
? message.dmChannelId
: (message as MessageWithUser & { dmChannelId?: string }).dmChannelId;
const dmChannels = useSpaceStore((s) => s.dmChannels);
// Read-only enforcement (client mirror of the server guard): a dead 1-on-1 DM
// (partner tombstoned) accepts no reaction mutations. Existing reactions still
// DISPLAY, but the add/toggle affordances are withdrawn since the server drops them.
const isDeadDmThread = !!dmChannelId && (() => {
const dm = dmChannels.find(d => d.id === dmChannelId);
return dm ? isDeletedPartnerDm(dm, currentUser) : false;
})();
const canManageMessages = hasPermissionBit(myChPerms, PermissionBits.MANAGE_MESSAGES);
const canSendMessages = isDmMessage || hasPermissionBit(myChPerms, PermissionBits.SEND_MESSAGES);
const canDelete = isAuthor || canManageMessages;
const canAddReactions = isDmMessage || hasPermissionBit(myChPerms, PermissionBits.ADD_REACTIONS);
const canAddReactions = (isDmMessage || hasPermissionBit(myChPerms, PermissionBits.ADD_REACTIONS)) && !isDeadDmThread;
const addReaction = useChatStore((s) => s.addReaction);
const removeReaction = useChatStore((s) => s.removeReaction);
@@ -181,6 +193,8 @@ export function Message({ message, isCompact, isFirstInGroup, previousMessageId
r.user ? isSelf(r.user, currentUser) : r.userId === currentUser?.id;
const toggleReaction = (emoji: string) => {
// Read-only: a dead 1-on-1 DM accepts no reaction mutations (add OR remove).
if (isDeadDmThread) return;
const hasReacted = message.reactions?.some(r => isOwnReaction(r) && r.emoji === emoji);
if (hasReacted) {
removeReaction(message.id, emoji);