feat(web): inline previews in chat and per-upload download limit choice

web/src/core-bridge/worker/uploadQueue.ts

@@ -87,7 +87,8 @@ async function runJob(job: Job): Promise<void> {
     const prepared = await prepareObject(resource, session, threadId, 'files');
     const plan = session.encryptFile(file, {}, {
       itemId: prepared.itemIdBytes,
-      ...(options.directPreview ? { gated: 'auto' as const } : { gated: true, maxDownloads: options.maxDownloads }),
+      // 小文件(一帧放得下)且不限制次数:不设上限,加入者直接预览。其余都带上每个文件的下载次数(0 = 不限)
+      ...(options.directPreview && file.size < maxFrameData - 1024 ? { gated: 'auto' as const } : { gated: true, maxDownloads: options.maxDownloads }),
       ts, maxFrameData, threadId, folderId,
     });
     item = {
@@ -95,9 +96,7 @@ async function runJob(job: Job): Promise<void> {
       ...(author ? { author } : {}),
       ...(threadId ? { threadId } : {}), ...(folderId ? { folderId } : {}), ...(localId ? { localId } : {}),
       name: file.name, mime: file.type || 'application/octet-stream', size: file.size,
-      remaining: plan.gated
-        ? (options.directPreview ? resource.maxDownloads ?? 0 : options.maxDownloads) || null
-        : null,
+      remaining: plan.gated ? options.maxDownloads || null : null,
       preview: previewKindOf(file.type, file.name), gated: plan.gated,
     };
     job.itemId = item.id;

web/src/features/channel/ChatAttachment.module.css

@@ -0,0 +1,80 @@
+.slot {
+  width: 360px;
+  max-width: 100%;
+  margin-top: var(--space-1);
+}
+
+.placeholder,
+.poster {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  gap: var(--space-2);
+  width: 100%;
+  min-height: 96px;
+  border: 1px solid var(--line-strong);
+  border-radius: var(--radius-md);
+  background: var(--surface-2);
+  color: var(--text-dim);
+  font: inherit;
+  font-size: 12px;
+}
+
+.poster {
+  cursor: pointer;
+}
+
+.picture {
+  display: block;
+  padding: 0;
+  border: 1px solid var(--line);
+  border-radius: var(--radius-md);
+  background: var(--surface-2);
+  cursor: zoom-in;
+  overflow: hidden;
+}
+
+.picture img {
+  display: block;
+  width: auto;
+  max-width: 100%;
+  height: auto;
+  max-height: 320px;
+}
+
+.video {
+  display: block;
+  width: 100%;
+  max-height: 320px;
+  border-radius: var(--radius-md);
+  background: var(--surface-2);
+}
+
+.audio {
+  width: 100%;
+}
+
+.snippet {
+  max-height: 220px;
+  margin: 0;
+  padding: var(--space-2) var(--space-3);
+  overflow: auto;
+  border: 1px solid var(--line);
+  border-radius: var(--radius-md);
+  background: var(--surface-2);
+  color: var(--text);
+  font-size: 12px;
+  white-space: pre-wrap;
+  overflow-wrap: anywhere;
+  cursor: pointer;
+}
+
+.archive {
+  max-height: 220px;
+  padding: var(--space-2) var(--space-3);
+  overflow: auto;
+  border: 1px solid var(--line);
+  border-radius: var(--radius-md);
+  background: var(--surface-2);
+  font-size: 12px;
+}

web/src/features/channel/ChatAttachment.tsx

@@ -0,0 +1,101 @@
+import { useEffect, useRef, useState } from 'react';
+import type { FileItem } from '@/core-bridge/types';
+import { formatSize } from '@/lib/format';
+import { Icon } from '@/ui/Icon';
+import { ArchivePreview } from '../item/previews/ArchivePreview';
+import { useBlobUrl } from '../item/useBlobUrl';
+import styles from './ChatAttachment.module.css';
+
+/** 聊天里自动展开的大小上限:再大的只显示文件卡片,点开预览 */
+const MB = 1024 * 1024;
+/** 不限制次数、不超过这个大小的,滚动到附近就自动加载;更大的显示占位,点一下才加载(整个文件要先解密到内存) */
+const AUTO = { image: 30 * MB, video: 25 * MB, audio: 25 * MB, archive: 50 * MB, text: 128 * 1024 } as const;
+/** 再大就不在聊天里展开了,只留文件卡片 */
+const MAX = { image: 100 * MB, video: 500 * MB, audio: 500 * MB, archive: 200 * MB, text: 128 * 1024 } as const;
+
+/** 滚动到附近才加载,一屏几十张图时不会一下子全部解密 */
+function useNearViewport<T extends HTMLElement>(): [React.RefObject<T | null>, boolean] {
+  const ref = useRef<T>(null);
+  const [near, setNear] = useState(false);
+  useEffect(() => {
+    const element = ref.current;
+    if (!element || near) return;
+    if (typeof IntersectionObserver === 'undefined') { setNear(true); return; }
+    const observer = new IntersectionObserver((entries) => { if (entries.some((entry) => entry.isIntersecting)) { setNear(true); observer.disconnect(); } }, { rootMargin: '300px' });
+    observer.observe(element);
+    return () => observer.disconnect();
+  }, [near]);
+  return [ref, near];
+}
+
+/** 不限制下载次数的文件直接预览;有上限的,读内容会消耗一次:不自动加载,点一次预览一次 */
+const isFree = (item: FileItem) => item.remaining === null;
+
+function Gate({ item, label, children }: { item: FileItem; label: string; children: () => React.ReactNode }) {
+  const auto = item.size <= (AUTO as Record<string, number>)[item.preview]!;
+  const [ref, near] = useNearViewport<HTMLDivElement>();
+  const [asked, setAsked] = useState(false);
+  const free = isFree(item);
+  return <div ref={ref} className={styles.slot}>
+    {free && auto ? (near ? children() : <div className={styles.placeholder} />)
+      : asked ? children()
+        : <button type="button" className={styles.poster} onClick={() => setAsked(true)}><Icon name="eye" size={20} /><span>{label} · {formatSize(item.size)}{free ? '' : ` · 消耗 1 次${typeof item.remaining === 'number' ? `（剩 ${item.remaining} 次）` : ''}`}</span></button>}
+  </div>;
+}
+
+function Picture({ item, onOpen }: { item: FileItem; onOpen: () => void }) {
+  const blob = useBlobUrl(item.id);
+  const [broken, setBroken] = useState(false);
+  if (blob.status === 'loading') return <div className={styles.placeholder}>加载中…</div>;
+  if (blob.status === 'error' || broken) return null;
+  return <button type="button" className={styles.picture} aria-label={`查看大图 ${item.name}`} onClick={onOpen}>
+    <img src={blob.url} alt={item.name} onError={() => setBroken(true)} />
+  </button>;
+}
+
+function Clip({ item }: { item: FileItem }) {
+  const blob = useBlobUrl(item.id);
+  if (blob.status === 'loading') return <div className={styles.placeholder}>加载中…</div>;
+  if (blob.status === 'error') return null;
+  return <video className={styles.video} src={blob.url} controls preload="metadata" playsInline />;
+}
+
+function Sound({ item }: { item: FileItem }) {
+  const blob = useBlobUrl(item.id);
+  return blob.status === 'ready' ? <audio className={styles.audio} src={blob.url} controls /> : null;
+}
+
+const LINES = 12;
+function Snippet({ item, onOpen }: { item: FileItem; onOpen: () => void }) {
+  const blob = useBlobUrl(item.id);
+  const [text, setText] = useState<string>();
+  useEffect(() => {
+    if (blob.status !== 'ready') return;
+    let active = true;
+    void blob.blob.text().then((value) => { if (active) setText(value); }).catch(() => undefined);
+    return () => { active = false; };
+  }, [blob]);
+  if (text === undefined) return null;
+  const lines = text.split('\n');
+  return <pre className={styles.snippet} onClick={onOpen}>{lines.slice(0, LINES).join('\n')}{lines.length > LINES ? '\n…' : ''}</pre>;
+}
+
+/** 这个文件能不能在聊天里直接展开(决定下面用简洁的一行还是完整的文件卡片) */
+export function hasInlinePreview(item: FileItem): boolean {
+  if (item.state.kind !== 'complete') return false;
+  const max = (MAX as Record<string, number>)[item.preview];
+  return max !== undefined && item.size <= max;
+}
+
+/** 聊天消息里的附件直接展开:图片(含 GIF 动图)、视频、音频、压缩包目录、小文本。文件卡片仍在下面,用来下载和打开预览 */
+export function ChatAttachment({ item, onOpen }: { item: FileItem; onOpen: () => void }) {
+  if (item.state.kind !== 'complete') return null;
+  switch (item.preview) {
+    case 'image': return item.size <= MAX.image ? <Gate item={item} label="查看图片">{() => <Picture item={item} onOpen={onOpen} />}</Gate> : null;
+    case 'video': return item.size <= MAX.video ? <Gate item={item} label="播放视频">{() => <Clip item={item} />}</Gate> : null;
+    case 'audio': return item.size <= MAX.audio ? <Gate item={item} label="播放音频">{() => <Sound item={item} />}</Gate> : null;
+    case 'archive': return item.size <= MAX.archive ? <Gate item={item} label="查看压缩包目录">{() => <div className={styles.archive}><ArchivePreview id={item.id} /></div>}</Gate> : null;
+    case 'text': return item.size <= MAX.text ? <Gate item={item} label="查看内容">{() => <Snippet item={item} onOpen={onOpen} />}</Gate> : null;
+    default: return null;
+  }
+}

web/src/features/channel/ChatMessage.tsx

@@ -9,6 +9,7 @@ import { TransferProgress } from '@/features/item/TransferProgress';
 import { Icon } from '@/ui/Icon';
 import { Button } from '@/ui/Button';
 import { ContextMenu, type MenuAction } from '@/ui/ContextMenu';
+import { ChatAttachment, hasInlinePreview } from './ChatAttachment';
 import { NameWithBadges } from './RoleBadges';
 import styles from './ChatPane.module.css';
 
@@ -54,14 +55,20 @@ export function ChatMessage({ id, compact = false, onOpenFile, onDelete }: Props
     <div className={styles.body}>
       {!compact ? <header><NameWithBadges username={sender?.username}><strong className={styles.senderName} title={sender?.username}>{name}</strong></NameWithBadges><time>{formatTime(item.ts)}</time></header> : null}
       {item.state.kind === 'tampered' ? <p className={styles.integrity}>内容校验失败，已拒绝显示。</p> : item.kind === 'text' ? <p className={styles.messageText}>{item.text}</p>
-        : <div className={styles.fileCard}>
-          <button type="button" className={styles.fileOpen} aria-label={`预览文件 ${item.name}`} disabled={!ready} onClick={() => onOpenFile(id)}>
-            <span className={styles.fileIcon}><Icon name={iconOf(item)} size={28} /></span>
-            <span className={styles.fileInfo}><strong>{item.name}</strong><span>{formatSize(item.size)} · {item.mime}</span></span>
-          </button>
-          <Button variant="ghost" icon="eye" label="预览" disabled={!ready} onClick={() => onOpenFile(id)} />
-          <Button variant="ghost" icon="download" label={downloading ? '下载中…' : '下载'} disabled={!ready || downloading} onClick={() => { void save(); }} />
-        </div>}
+        : <>
+          {ready ? <ChatAttachment item={item} onOpen={() => onOpenFile(id)} /> : null}
+          {ready && hasInlinePreview(item) ? <div className={styles.fileCaption}>
+            <span className={styles.captionName}>{item.name}</span><span className={styles.captionSize}>{formatSize(item.size)}</span>
+            {item.preview === 'archive' || item.preview === 'text' ? <Button variant="ghost" icon="eye" label="预览" onClick={() => onOpenFile(id)} /> : null}
+            <Button variant="ghost" icon="download" label={downloading ? '下载中…' : '下载'} disabled={downloading} onClick={() => { void save(); }} />
+          </div> : <div className={styles.fileCard}>
+            <button type="button" className={styles.fileOpen} aria-label={`预览文件 ${item.name}`} disabled={!ready} onClick={() => onOpenFile(id)}>
+              <span className={styles.fileIcon}><Icon name={iconOf(item)} size={28} /></span>
+              <span className={styles.fileInfo}><strong>{item.name}</strong><span>{formatSize(item.size)} · {item.mime}</span></span>
+            </button>
+            <Button variant="ghost" icon="eye" label="预览" disabled={!ready} onClick={() => onOpenFile(id)} />
+            <Button variant="ghost" icon="download" label={downloading ? '下载中…' : '下载'} disabled={!ready || downloading} onClick={() => { void save(); }} />
+          </div>}</>}
       {item.state.kind === 'receiving' && item.kind === 'file' ? <TransferProgress state={item.state} {...(self && item.localId ? { onCancel: () => { void cancelUpload(item.localId!, item.id); } } : {})} />
         : failed ? <span className={styles.failure} role="alert">发送失败。<button type="button" onClick={() => { void retry(id); }}>重试</button></span>
           : item.state.kind === 'incomplete' ? <span className={styles.delivery}>发送未完成，等待续传。</span> : null}

web/src/features/channel/ChatPane.module.css

@@ -309,3 +309,26 @@
     display: none;
   }
 }
+
+/* 已经在上面展开预览的文件:只留一行文件名、大小和下载 */
+.fileCaption {
+  display: flex;
+  align-items: center;
+  gap: var(--space-2);
+  width: 360px;
+  max-width: 100%;
+  color: var(--text-dim);
+  font-size: 12px;
+}
+
+.captionName {
+  min-width: 0;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
+.captionSize {
+  flex: 1;
+  white-space: nowrap;
+}

web/src/features/channel/UploadOptionsSheet.tsx

@@ -17,35 +17,37 @@ interface Props {
 
 export function UploadOptionsSheet({ files, defaultMaxDownloads, onClose, onUpload, encrypted = true }: Props) {
   const { info } = useServerSettings();
-  const [directPreview, setDirectPreview] = useState(true);
-  const [maxDownloads, setMaxDownloads] = useState(defaultMaxDownloads);
+  const [limited, setLimited] = useState(false);
+  const choices = withCurrent(info?.choices.file_max_downloads ?? [], defaultMaxDownloads).filter((n) => n > 0);
+  const [times, setTimes] = useState(defaultMaxDownloads > 0 ? defaultMaxDownloads : 10);
+
+  // 不限制:聊天里直接预览,不消耗次数。限制:预览、下载每次都消耗一次
+  const options: FileUploadOptions = limited ? { directPreview: false, maxDownloads: times } : { directPreview: true, maxDownloads: 0 };
 
   return (
     <Sheet
       title={`上传 ${files.length} 个文件`}
       onClose={onClose}
-      actions={<Button variant="primary" disabled={!info} onClick={() => onUpload({ directPreview, maxDownloads })}>继续上传</Button>}
+      actions={<Button variant="primary" disabled={!info} onClick={() => onUpload(options)}>继续上传</Button>}
     >
-      <div className={styles.form}>
+      <div className={styles.form} role="radiogroup" aria-label="下载次数">
         <label className={styles.check}>
-          <input type="checkbox" checked={directPreview} onChange={(e) => setDirectPreview(e.target.checked)} />
-          <span>单帧文件加入空间后可直接预览</span>
+          <input type="radio" name="limit" checked={!limited} onChange={() => setLimited(false)} />
+          <span>不限制次数 · 在聊天里直接预览</span>
         </label>
-        {directPreview ? (
-          <p className={styles.note}>图片、文本等单帧文件会随空间同步,加入者可直接预览且不计下载次数。大文件必须分帧,仍会受空间下载上限限制。</p>
-        ) : (
-          <>
-            <label className={styles.field}>
-              <span>每个文件最多下载次数</span>
-              <select value={maxDownloads} onChange={(e) => setMaxDownloads(Number(e.target.value))}>
-                {withCurrent(info?.choices.file_max_downloads ?? [], defaultMaxDownloads).map((n) => (
-                  <option key={n} value={n}>{n === 0 ? '不限' : `${n} 次`}</option>
-                ))}
-              </select>
-            </label>
-            <p className={styles.note}>预览和下载内容会消耗次数。{encrypted ? '文件名与类型通过加密目录同步，不消耗次数。' : '此空间未启用端到端加密，服务端能看到文件名与类型。'}</p>
-          </>
-        )}
+        <label className={styles.check}>
+          <input type="radio" name="limit" checked={limited} onChange={() => setLimited(true)} />
+          <span>限制次数 · 点击预览或下载才消耗一次</span>
+        </label>
+        {limited ? (
+          <label className={styles.field}>
+            <span>每个文件最多</span>
+            <select value={times} onChange={(e) => setTimes(Number(e.target.value))}>
+              {choices.map((n) => <option key={n} value={n}>{n} 次</option>)}
+            </select>
+          </label>
+        ) : null}
+        <p className={styles.note}>{encrypted ? '文件名与类型通过加密目录同步，不消耗次数。' : '此空间未启用端到端加密，服务端能看到文件名与类型。'}</p>
       </div>
     </Sheet>
   );