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Chat+ link previews: a link in a chat shows its page's title, text and picture, YouTube playable in place

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X's web chat shows a link as a bare card. An X tab on a chat page may now ask native code
(link_preview, x-capture only, chat pages only) for one link's preview. Native code fetches it:
https and public hosts only (addresses checked and pinned), never X's hosts, no cookies or
referrer, redirects re-checked, page head <= 512 KB, images <= 1.5 MB by magic bytes as data:,
30 fetches a minute, memory-only cache. Only the link leaves the page. On by default (owner,
2026-10-10).
This commit is contained in:
CRTkafa 2026-10-10 21:47:31 +08:00
parent 96f909c110
commit 328264bfe1
21 changed files with 1455 additions and 519 deletions
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4
apps/desktop/tests/areas.test.ts
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@ -133,6 +133,8 @@ const DEFAULT_ON = [
'logoBrush', 'twitterWording', 'singleSplitNav',
'fixLikeFollow', 'fixScrollRestore', 'fixTimelineJump', 'fixHomeTab', 'fixNotificationBadge', 'fixNewPostsPill', 'fixMediaUpload', 'followingChronological', 'fixChatButton', 'composerRestorePrompt',
'composerDrafts', 'hidePromotedPosts', 'mediaDownload', 'rememberVideoVolume', 'searchOperators', 'notifications.keywordAlerts',
// On by default by the owner's choice (2026-10-10): Chat+ link previews.
'chat.linkPreviews',
];
/** What Advanced adds: the calm features that came with the area plugins (they add something; none hides or changes X). */
const ADVANCED_ADDS = [
@ -166,7 +168,7 @@ test('modes: the exact flags of Basic, Advanced and Power User; an existing setu
assert.deepEqual(on(defaults), [...DEFAULT_ON].sort());
assert.deepEqual(running(null), [...DEFAULT_ON].sort());
for (const [flag, value] of Object.entries(FEATURE_DEFAULTS)) assert.equal(defaults[flag], value, flag);
for (const feature of X_FEATURES) if (!(feature.id in FEATURE_DEFAULTS) && feature.id !== 'notifications.keywordAlerts' && feature.backing !== 'plugin') assert.equal(defaults[feature.id], false, `${feature.id} is new: off by default`);
for (const feature of X_FEATURES) if (!(feature.id in FEATURE_DEFAULTS) && feature.id !== 'notifications.keywordAlerts' && feature.id !== 'chat.linkPreviews' && feature.backing !== 'plugin') assert.equal(defaults[feature.id], false, `${feature.id} is new: off by default`);
for (const row of supersededFiles(X_TABLE)) assert.equal(defaults[row.flag], false, `${row.flag}: what came from an opt-in plugin stays off`);
// Basic: every area off (so everything an area owns is off), no logo or wording; the fixes and split-view navigation stay.