fix: sync web page preview pending deadline

internal/rpc/messages_compat.go

@@ -380,7 +380,7 @@ func (r *Router) webPagePreviewMedia(ctx context.Context, message string, entiti
 
 // resolveWebPageForRequest 为交互式读 RPC 解析链接预览：先查缓存（LookupWebPage，命中即返回，
 // 不抓取不阻塞）；未命中才同步抓取，但用受限短预算（webpageRequestResolveBudget）而非异步解析
-// 的 20s，避免慢/挂上游把 RPC worker 钉死。命中（含负缓存的 empty）返回 ok=true，调用方据 state
+// 的 30s，避免慢/挂上游把 RPC worker 钉死。命中（含负缓存的 empty）返回 ok=true，调用方据 state
 // 决定；抓取失败返回 false。未启用返回 false。
 func (r *Router) resolveWebPageForRequest(ctx context.Context, url string) (domain.MessageWebPage, bool) {
 	if page, ok := r.resolveAIComposeStyleWebPage(ctx, url); ok {

internal/rpc/messages_send_webpage_rpc_test.go

@@ -3,6 +3,7 @@ package rpc
 import (
 	"context"
 	"testing"
+	"time"
 
 	"github.com/iamxvbaba/td/tg"
 
@@ -27,6 +28,8 @@ func TestSendMessageAttachesWebPagePending(t *testing.T) {
 	ctx := context.Background()
 	r, owner, friend := newMediaTestRouter(t)
 	r.deps.Files.(*fakeFiles).webPagePreviewOn = true
+	now := time.Date(2030, time.January, 2, 3, 4, 5, 0, time.UTC)
+	r.clock = fixedClock{now: now}
 
 	updates, err := r.onMessagesSendMessage(WithUserID(ctx, owner.ID), &tg.MessagesSendMessageRequest{
 		Peer:        &tg.InputPeerUser{UserID: friend.ID, AccessHash: friend.AccessHash},
@@ -55,11 +58,52 @@ func TestSendMessageAttachesWebPagePending(t *testing.T) {
 	if url, _ := pending.GetURL(); url != wpTestURL {
 		t.Errorf("pending url = %q, want %q", url, wpTestURL)
 	}
+	wantDeadline := int(now.Add(webPagePendingLifetime).Unix())
+	if pending.Date != wantDeadline {
+		t.Errorf("pending date = %d, want retry deadline %d", pending.Date, wantDeadline)
+	}
+	if time.Unix(int64(pending.Date), 0).Sub(now) <= webPageResolveTimeout {
+		t.Errorf("pending deadline must outlive resolver timeout: deadline=%s timeout=%s", time.Unix(int64(pending.Date), 0), webPageResolveTimeout)
+	}
 	if !msg.InvertMedia {
 		t.Errorf("invert_media not projected onto message")
 	}
 }
 
+// TestSendChannelMessageUsesSameFutureWebPageDeadline 锁定频道发送也经过同一 pending
+// 截止时间构造路径，避免只修私聊 echo 而频道仍被客户端立即判定过期。
+func TestSendChannelMessageUsesSameFutureWebPageDeadline(t *testing.T) {
+	ctx := context.Background()
+	r, owner, channel := newRichChannelTestRouter(t)
+	r.deps.Files.(*fakeFiles).webPagePreviewOn = true
+	// 本测试只验证发送投影，不启动异步解析 goroutine。
+	r.webPageResolveSem = nil
+	now := time.Date(2030, time.February, 3, 4, 5, 6, 0, time.UTC)
+	r.clock = fixedClock{now: now}
+
+	updates, err := r.onMessagesSendMessage(WithUserID(ctx, owner.ID), &tg.MessagesSendMessageRequest{
+		Peer:     &tg.InputPeerChannel{ChannelID: channel.ID, AccessHash: channel.AccessHash},
+		Message:  wpTestMessage,
+		Entities: wpURLEntities(),
+		RandomID: 5106,
+	})
+	if err != nil {
+		t.Fatalf("send channel message: %v", err)
+	}
+	msg := newMessageFromUpdates(t, updates)
+	wrap, ok := msg.Media.(*tg.MessageMediaWebPage)
+	if !ok {
+		t.Fatalf("channel media = %T, want *tg.MessageMediaWebPage", msg.Media)
+	}
+	pending, ok := wrap.Webpage.(*tg.WebPagePending)
+	if !ok {
+		t.Fatalf("channel webpage = %T, want *tg.WebPagePending", wrap.Webpage)
+	}
+	if want := int(now.Add(webPagePendingLifetime).Unix()); pending.Date != want {
+		t.Errorf("channel pending date = %d, want retry deadline %d", pending.Date, want)
+	}
+}
+
 // TestSendMessageAttachesCachedDoneCard 验证：URL 已缓存解析时，发送 echo 直接带 done 卡片
 // （非 pending）——官方行为，TDesktop 据此立即渲染、不依赖异步换卡。
 func TestSendMessageAttachesCachedDoneCard(t *testing.T) {

internal/rpc/webpage_resolver.go

@@ -18,6 +18,10 @@ import (
 const (
 	webPageResolveConcurrency = 16
 	webPageResolveTimeout     = 30 * time.Second
+	// webPagePendingLifetime 是客户端在重新拉取 pending 消息前等待的窗口。
+	// TDesktop 与 DrKLO 都把 webPagePending.date 解释为绝对截止时间，而不是处理开始时间；
+	// 该窗口必须严格大于 resolver 的最大执行时间，避免正常的慢解析被客户端提前标记为失败。
+	webPagePendingLifetime = 2 * time.Minute
 )
 
 type webPageResolveJob struct {

internal/rpc/webpage_url_extract.go

@@ -135,9 +135,10 @@ func (r *Router) webPagePendingOrCachedMedia(ctx context.Context, rawURL string,
 			State: domain.MessageWebPageStatePending,
 			ID:    domain.WebPageURLHash(normalized),
 			URL:   normalized,
-			// Date=「processing started」时刻：留 0（=1970）会被严格客户端判为 pending 早已
-			// 过期 → 直接显示纯文本，须填发送时刻。
-			Date:            int(r.clock.Now().Unix()),
+			// date 是客户端重新拉取 pending 消息的绝对截止时间。TDesktop/DrKLO 在
+			// date<=now 时立即重取；若 resolver 此时仍运行，TDesktop 会把占位记成 sticky
+			// failed，后到的 done update 也不会重新显示卡片。
+			Date:            int(r.clock.Now().Add(webPagePendingLifetime).Unix()),
 			ForceLargeMedia: forceLarge,
 			ForceSmallMedia: forceSmall,
 		},