fix-2

cmd/unified/main.go

@@ -10,6 +10,7 @@ import (
 	"net/http"
 	"os"
 	"os/signal"
+	"path/filepath"
 	"strconv"
 	"strings"
 	"syscall"
@@ -55,6 +56,11 @@ func loadConfig() AppConfig {
 	m.PeerTTL = parseDuration(os.Getenv("MESH_PEER_TTL"), 2*time.Minute)
 	m.PruneInterval = parseDuration(os.Getenv("MESH_PRUNE_INTERVAL"), 30*time.Second)
 
+	m.HelloInterval = parseDuration(os.Getenv("MESH_HELLO_INTERVAL"), 20*time.Second)
+	m.HelloFanout = parseIntEnv(os.Getenv("MESH_HELLO_FANOUT"), 8)
+
+	m.BlobTimeout = parseDuration(os.Getenv("MESH_BLOB_TIMEOUT"), 0)
+
 	// Wenn keine AdvertURL gesetzt ist, versuche eine sinnvolle Herleitung:
 	if strings.TrimSpace(m.AdvertURL) == "" {
 		m.AdvertURL = inferAdvertURL(m.BindAddr)
@@ -101,6 +107,18 @@ func parseBoolEnv(k string, def bool) bool {
 	return v == "1" || v == "true" || v == "yes" || v == "on"
 }
 
+func parseIntEnv(k string, def int) int {
+	v := strings.TrimSpace(os.Getenv(k))
+	if v == "" {
+		return def
+	}
+	n, err := strconv.Atoi(v)
+	if err != nil {
+		return def
+	}
+	return n
+}
+
 func splitCSV(s string) []string {
 	s = strings.TrimSpace(s)
 	if s == "" {
@@ -257,6 +275,10 @@ func fileRoutes(mux *http.ServeMux, store filesvc.MeshStore, blobs blobfs.Store)
 		}
 		it, err := store.Rename(r.Context(), in.ID, in.Name)
 		if err != nil {
+			if errors.Is(err, filesvc.ErrForbidden) {
+				writeJSON(w, http.StatusForbidden, map[string]string{"error": "only owner may modify"})
+				return
+			}
 			status := http.StatusBadRequest
 			if errors.Is(err, filesvc.ErrNotFound) {
 				status = http.StatusNotFound
@@ -283,6 +305,10 @@ func fileRoutes(mux *http.ServeMux, store filesvc.MeshStore, blobs blobfs.Store)
 		it, err := store.Delete(r.Context(), in.ID)
 		_ = blobs.Delete(r.Context(), string(in.ID))
 		if err != nil {
+			if errors.Is(err, filesvc.ErrForbidden) {
+				writeJSON(w, http.StatusForbidden, map[string]string{"error": "only owner may modify"})
+				return
+			}
 			status := http.StatusBadRequest
 			if errors.Is(err, filesvc.ErrNotFound) {
 				status = http.StatusNotFound
@@ -363,13 +389,23 @@ func apiFiles(mux *http.ServeMux, store filesvc.MeshStore, blobs blobfs.Store, m
 		}
 
 		// 3) remote holen & cachen
+		it1, _ := store.Get(r.Context(), filesvc.ID(id))
+		peers := meshNode.PeerList()
+		ttl := 2 * time.Minute
+		if cfg := meshNode.Config(); cfg.PeerTTL > 0 {
+			ttl = cfg.PeerTTL
+		}
+		if !isOwnerActive(it1.Owner, peers, ttl) {
+			http.NotFound(w, r)
+			return
+		}
 		rrc, _, _, _, err := meshNode.FetchBlobAny(r.Context(), id)
 		if err != nil {
 			http.NotFound(w, r)
 			return
 		}
 		defer rrc.Close()
-		if _, err := blobs.Save(r.Context(), id, it.Name, rrc); err != nil {
+		if _, err := blobs.Save(r.Context(), id, it1.Name, rrc); err != nil {
 			http.Error(w, "cache failed", http.StatusInternalServerError)
 			return
 		}
@@ -381,7 +417,7 @@ func apiFiles(mux *http.ServeMux, store filesvc.MeshStore, blobs blobfs.Store, m
 			return
 		}
 		defer lrc.Close()
-		serveBlob(w, r, lrc, meta, it.Name)
+		serveBlob(w, r, lrc, meta, it1.Name)
 	})
 }
 
@@ -395,6 +431,7 @@ func toMeshSnapshot(s filesvc.Snapshot) mesh.Snapshot {
 			Name:      it.Name,
 			UpdatedAt: it.UpdatedAt,
 			Deleted:   it.Deleted,
+			Owner:     it.Owner,
 		})
 	}
 	return out
@@ -408,22 +445,52 @@ func fromMeshSnapshot(ms mesh.Snapshot) filesvc.Snapshot {
 			Name:      it.Name,
 			UpdatedAt: it.UpdatedAt,
 			Deleted:   it.Deleted,
+			Owner:     it.Owner,
 		})
 	}
 	return out
 }
 
+// isOwnerActive prüft, ob der Owner in der Peer-Liste als "aktiv" gilt.
+func isOwnerActive(owner string, peers []mesh.Peer, ttl time.Duration) bool {
+	owner = strings.TrimSpace(owner)
+	if owner == "" {
+		return true
+	}
+	cutoff := time.Now().Add(-ttl)
+	for _, p := range peers {
+		if strings.TrimSpace(p.URL) != owner {
+			continue
+		}
+		// Self ist per Definition aktiv
+		if p.Self {
+			return true
+		}
+		// ohne LastSeen: als inaktiv behandeln
+		if p.LastSeen.IsZero() {
+			return false
+		}
+		return p.LastSeen.After(cutoff)
+	}
+	// Owner ist nicht mal in der Liste: inaktiv
+	return false
+}
+
 /*** main ***/
 
 func main() {
 	cfg := loadConfig()
 
 	// Domain-Store (mesh-fähig)
-	st := filesvc.NewMemStore()
+	nodeID := strings.TrimSpace(cfg.Mesh.AdvertURL)
+	//st := filesvc.NewMemStore(nodeID)
 
 	// Mesh starten
 	//mcfg := mesh.FromEnv()
 	blobs := blobfs.New(getenvDefault("DATA_DIR", "./data"))
+	dataDir := getenvDefault("DATA_DIR", "./data")
+	metaPath := filepath.Join(dataDir, "meta", "items.json")
+	st := filesvc.NewMemStorePersistent(nodeID, metaPath)
 
 	mnode, err := mesh.New(cfg.Mesh, mesh.Callbacks{
 		GetSnapshot: func(ctx context.Context) (mesh.Snapshot, error) {
@@ -463,6 +530,47 @@ func main() {
 		}
 	}()
 
+	go func() {
+		ticker := time.NewTicker(1 * time.Minute)
+		defer ticker.Stop()
+		for range ticker.C {
+			// aktive Owner bestimmen
+			peers := mnode.PeerList()
+			ttl := 2 * time.Minute
+			if cfg := mnode.Config(); cfg.PeerTTL > 0 {
+				ttl = cfg.PeerTTL
+			}
+			cutoff := time.Now().Add(-ttl)
+
+			active := map[string]bool{}
+			for _, p := range peers {
+				if p.Self {
+					active[p.URL] = true
+					continue
+				}
+				if !p.LastSeen.IsZero() && p.LastSeen.After(cutoff) {
+					active[p.URL] = true
+				}
+			}
+
+			// alle Items durchgehen; Blobs von Offline-Ownern löschen
+			var next filesvc.ID
+			for {
+				items, nextOut, _ := st.List(context.Background(), next, 1000)
+				for _, it := range items {
+					if it.Owner == "" || active[it.Owner] {
+						continue
+					}
+					_ = blobs.Delete(context.Background(), it.ID)
+				}
+				if nextOut == "" {
+					break
+				}
+				next = nextOut
+			}
+		}
+	}()
+
 	// Root-Mux
 	root := http.NewServeMux()
 
@@ -533,51 +641,64 @@ func registerPublicDownloads(mux *http.ServeMux, store filesvc.MeshStore, blobs
 		base = "/" + base
 	}
 	mux.HandleFunc(base+"/", func(w http.ResponseWriter, r *http.Request) {
-		idStr := strings.TrimPrefix(r.URL.Path, base+"/")
-		if idStr == "" {
-			http.NotFound(w, r)
-			return
-		}
-		id := idStr
-		if strings.TrimSpace(id) == "" {
+		id := strings.TrimSpace(strings.TrimPrefix(r.URL.Path, base+"/"))
+		if id == "" {
 			http.NotFound(w, r)
 			return
 		}
 
-		// 1) Metadaten prüfen (nicht vorhanden oder gelöscht → 404)
+		// 1) Metadaten prüfen
 		it, err := store.Get(r.Context(), filesvc.ID(id))
 		if err != nil || it.Deleted {
 			http.NotFound(w, r)
 			return
 		}
 
-		// 2) lokal versuchen
-		if rc, meta, err := blobs.Open(r.Context(), id); err == nil {
+		// 2) Lokal versuchen
+		if rc, meta, err := blobs.Open(context.Background(), id); err == nil {
 			defer rc.Close()
-			serveBlob(w, r, rc, meta, it.Name) // Download-Name aus Store!
+			serveBlob(w, r, rc, meta, it.Name)
 			return
 		}
 
-		// 3) aus Mesh holen (signiert) und cachen
-		rrc, _, _, _, err := meshNode.FetchBlobAny(r.Context(), id)
+		// (Optional) Owner-Online-Check — wenn du auch bei offline Ownern liefern willst, block auskommentieren
+		{
+			peers := meshNode.PeerList()
+			ttl := 2 * time.Minute
+			if !isOwnerActive(it.Owner, peers, ttl) {
+				http.NotFound(w, r)
+				return
+			}
+		}
+
+		// 3) Aus Mesh holen — EIGENER Timeout-Kontext, NICHT r.Context()
+		rrc, remoteName, _, _, err := meshNode.FetchBlobAny(context.Background(), id)
 		if err != nil {
 			http.NotFound(w, r)
 			return
 		}
 		defer rrc.Close()
-		if _, err := blobs.Save(r.Context(), id, it.Name, rrc); err != nil {
-			http.Error(w, "cache failed", http.StatusInternalServerError)
+
+		filename := strings.TrimSpace(remoteName)
+		if filename == "" {
+			filename = it.Name
+		}
+
+		// 4) Lokal cachen — KEIN Request-Kontext, damit Save nicht abbricht
+		if _, err := blobs.Save(context.Background(), id, filename, rrc); err != nil {
+			log.Printf("[public] cache save failed id=%s name=%q: %v", id, filename, err)
+			http.Error(w, "cache failed: "+err.Error(), http.StatusInternalServerError)
 			return
 		}
 
-		// 4) erneut lokal öffnen und streamen
-		lrc, meta, err := blobs.Open(r.Context(), id)
+		// 5) Erneut lokal öffnen und streamen
+		lrc, meta, err := blobs.Open(context.Background(), id)
 		if err != nil {
-			http.Error(w, "open failed", http.StatusInternalServerError)
+			http.Error(w, "open failed: "+err.Error(), http.StatusInternalServerError)
 			return
 		}
 		defer lrc.Close()
-		serveBlob(w, r, lrc, meta, it.Name)
+		serveBlob(w, r, lrc, meta, filename)
 	})
 }
 

internal/admin/admin.go

@@ -60,21 +60,32 @@ func Register(mux *http.ServeMux, d Deps) {
 		items, nextOut, _ := d.Store.List(r.Context(), nextID, 100)
 
 		type row struct {
-			ID        string
-			Name      string
-			UpdatedAt int64
-			HasBlob   bool
-			Size      int64
+			ID          string
+			Name        string
+			UpdatedAt   int64
+			HasBlob     bool
+			Size        int64
+			Owner       string
+			OwnerActive bool
 		}
 		rows := make([]row, 0, len(items))
+
+		peers := d.Mesh.PeerList()
+		ttl := 2 * time.Minute
+		if cfg := d.Mesh.Config(); cfg.PeerTTL > 0 {
+			ttl = cfg.PeerTTL
+		}
+
 		for _, it := range items {
 			meta, ok, _ := d.Blob.Stat(r.Context(), it.ID)
 			rows = append(rows, row{
-				ID:        it.ID,
-				Name:      it.Name,
-				UpdatedAt: it.UpdatedAt,
-				HasBlob:   ok,
-				Size:      meta.Size,
+				ID:          it.ID,
+				Name:        it.Name,
+				UpdatedAt:   it.UpdatedAt,
+				HasBlob:     ok,
+				Size:        meta.Size,
+				Owner:       it.Owner,
+				OwnerActive: isOwnerActive(it.Owner, peers, ttl),
 			})
 		}
 
@@ -84,6 +95,42 @@ func Register(mux *http.ServeMux, d Deps) {
 		})
 	})
 
+	mux.HandleFunc("/admin/items/takeover", func(w http.ResponseWriter, r *http.Request) {
+		if r.Method != http.MethodPost {
+			http.Error(w, "method not allowed", http.StatusMethodNotAllowed)
+			return
+		}
+		id := strings.TrimSpace(r.FormValue("id"))
+		if id != "" {
+			// Nur zulassen, wenn Owner tatsächlich offline ist
+			it, err := d.Store.Get(r.Context(), filesvc.ID(id))
+			if err == nil {
+				peers := d.Mesh.PeerList()
+				ttl := 2 * time.Minute
+				if cfg := d.Mesh.Config(); cfg.PeerTTL > 0 {
+					ttl = cfg.PeerTTL
+				}
+				if !isOwnerActive(it.Owner, peers, ttl) {
+					// eigene URL aus PeerList ermitteln
+					self := ""
+					for _, p := range peers {
+						if p.Self {
+							self = p.URL
+							break
+						}
+					}
+					if self == "" {
+						self = "unknown-self"
+					}
+					if _, err := d.Store.TakeoverOwner(r.Context(), filesvc.ID(id), self); err == nil {
+						_ = d.Mesh.SyncNow(r.Context())
+					}
+				}
+			}
+		}
+		renderItemsPartial(w, r, d)
+	})
+
 	// Upload (multipart/form-data, Feldname "file", optional name-Override)
 	mux.HandleFunc("/admin/files/upload", func(w http.ResponseWriter, r *http.Request) {
 		if r.Method != http.MethodPost {
@@ -258,25 +305,32 @@ func BasicAuth(user, pass string, next http.Handler) http.Handler {
 // rebuild & render items partial for HTMX swaps
 func renderItemsPartial(w http.ResponseWriter, r *http.Request, d Deps) {
 	type row struct {
-		ID        string
-		Name      string
-		UpdatedAt int64
-		HasBlob   bool
-		Size      int64
+		ID          string
+		Name        string
+		UpdatedAt   int64
+		HasBlob     bool
+		Size        int64
+		Owner       string
+		OwnerActive bool
 	}
 
 	nextID := filesvc.ID(strings.TrimSpace(r.URL.Query().Get("next")))
 	items, nextOut, _ := d.Store.List(r.Context(), nextID, 100)
 
+	peers := d.Mesh.PeerList()
+	ttl := 2 * time.Minute
+
 	rows := make([]row, 0, len(items))
 	for _, it := range items {
 		meta, ok, _ := d.Blob.Stat(r.Context(), (it.ID))
 		rows = append(rows, row{
-			ID:        (it.ID),
-			Name:      it.Name,
-			UpdatedAt: it.UpdatedAt,
-			HasBlob:   ok,
-			Size:      meta.Size,
+			ID:          (it.ID),
+			Name:        it.Name,
+			UpdatedAt:   it.UpdatedAt,
+			HasBlob:     ok,
+			Size:        meta.Size,
+			Owner:       it.Owner,
+			OwnerActive: isOwnerActive(it.Owner, peers, ttl),
 		})
 	}
 	w.Header().Set("Content-Type", "text/html; charset=utf-8")
@@ -285,3 +339,23 @@ func renderItemsPartial(w http.ResponseWriter, r *http.Request, d Deps) {
 		"Next":  nextOut,
 	})
 }
+
+func isOwnerActive(owner string, peers []mesh.Peer, ttl time.Duration) bool {
+	if strings.TrimSpace(owner) == "" {
+		return true
+	}
+	cutoff := time.Now().Add(-ttl)
+	for _, p := range peers {
+		if strings.TrimSpace(p.URL) == strings.TrimSpace(owner) {
+			// Self ist immer aktiv, sonst nach LastSeen
+			if p.Self {
+				return true
+			}
+			if p.LastSeen.IsZero() {
+				return false
+			}
+			return p.LastSeen.After(cutoff)
+		}
+	}
+	return false
+}

internal/admin/tpl/partials_items.html

@@ -24,13 +24,19 @@
   <table>
     <thead>
       <tr>
-        <th>ID</th><th>Name</th><th>Updated</th><th>Blob</th><th style="width:260px">Aktionen</th>
+        <th>ID</th>
+        <th>Name</th>
+        <th>Updated</th>
+        <th>Blob</th>
+        <th>Owner</th>
+        <th>Status</th>
+        <th style="width:320px">Aktionen</th>
       </tr>
     </thead>
     <tbody>
     {{ range .Items }}
       <tr>
-        <td>{{ .ID }}</td>
+        <td><code style="font-size:12px">{{ .ID }}</code></td>
         <td>{{ .Name }}</td>
         <td><small class="muted">{{ printf "%.19s" (timeRFC3339 .UpdatedAt) }}</small></td>
         <td>
@@ -41,18 +47,34 @@
             <span class="pill" style="background:#3a0b0b;border-color:#5b1a1a;color:#fbb;">fehlt</span>
           {{ end }}
         </td>
+        <td><small class="muted">{{ .Owner }}</small></td>
+        <td>
+          {{ if .OwnerActive }}
+            <span class="pill">online</span>
+          {{ else }}
+            <span class="pill" style="background:#5b1a1a;border-color:#7a2b2b;color:#fbb">offline</span>
+            <!-- Owner-Handover nur wenn offline -->
+            <form style="display:inline"
+                  hx-post="/admin/items/takeover"
+                  hx-target="#items" hx-swap="outerHTML"
+                  onsubmit="return confirm('Owner übernehmen?');">
+              <input type="hidden" name="id" value="{{ .ID }}">
+              <button class="btn" type="submit">Übernehmen</button>
+            </form>
+          {{ end }}
+        </td>
         <td>
           <form style="display:inline-flex; gap:6px"
-            hx-post="/admin/items/rename"
-            hx-target="#items" hx-swap="outerHTML">
+                hx-post="/admin/items/rename"
+                hx-target="#items" hx-swap="outerHTML">
             <input type="hidden" name="id" value="{{ .ID }}">
             <input type="text" name="name" placeholder="Neuer Name">
             <button class="btn" type="submit">Rename</button>
           </form>
           <form style="display:inline"
-            hx-post="/admin/items/delete"
-            hx-target="#items" hx-swap="outerHTML"
-            onsubmit="return confirm('Wirklich löschen (inkl. Blob)?');">
+                hx-post="/admin/items/delete"
+                hx-target="#items" hx-swap="outerHTML"
+                onsubmit="return confirm('Wirklich löschen (inkl. Blob)?');">
             <input type="hidden" name="id" value="{{ .ID }}">
             <button class="btn" type="submit">Delete</button>
           </form>
@@ -62,17 +84,17 @@
         </td>
       </tr>
     {{ else }}
-      <tr><td colspan="5" class="muted">Keine Dateien vorhanden.</td></tr>
+      <tr><td colspan="7" class="muted">Keine Dateien vorhanden.</td></tr>
     {{ end }}
     </tbody>
   </table>
 
   {{ if .Next }}
     <div style="margin-top:10px">
-      <button class="btn" 
-              hx-get="/admin/items?next={{ .Next }}" 
+      <button class="btn"
+              hx-get="/admin/items?next={{ .Next }}"
               hx-target="#items" hx-swap="outerHTML">Mehr laden</button>
       <span class="pill">next={{ .Next }}</span>
     </div>
   {{ end }}
-</div>
+</div>

internal/filesvc/memstore.go

@@ -2,6 +2,9 @@ package filesvc
 
 import (
 	"context"
+	"encoding/json"
+	"os"
+	"path/filepath"
 	"slices"
 	"strings"
 	"sync"
@@ -11,15 +14,82 @@ import (
 type MemStore struct {
 	mu    sync.Mutex
 	items map[ID]File
-
+	self  string
 	// optionales Eventing
-	subs []chan ChangeEvent
+	subs        []chan ChangeEvent
+	persistPath string
 }
 
-func NewMemStore() *MemStore {
-	return &MemStore{
-		items: make(map[ID]File),
+func NewMemStore(self string) *MemStore {
+	return &MemStore{self: strings.TrimSpace(self), items: make(map[ID]File)}
+}
+
+func NewMemStorePersistent(self, path string) *MemStore {
+	m := NewMemStore(self)
+	m.persistPath = strings.TrimSpace(path)
+	// beim Start versuchen zu laden
+	_ = m.loadFromDisk()
+	return m
+}
+
+// --- Persistenz-Helper (NEU) ---
+
+func (m *MemStore) loadFromDisk() error {
+	if m.persistPath == "" {
+		return nil
 	}
+	f, err := os.Open(m.persistPath)
+	if err != nil {
+		return nil // Datei existiert beim ersten Start nicht – ok
+	}
+	defer f.Close()
+	var snap Snapshot
+	if err := json.NewDecoder(f).Decode(&snap); err != nil {
+		return err
+	}
+	m.mu.Lock()
+	for _, it := range snap.Items {
+		m.items[it.ID] = it
+	}
+	m.mu.Unlock()
+	return nil
+}
+
+func (m *MemStore) saveLocked() error {
+	if m.persistPath == "" {
+		return nil
+	}
+	if err := os.MkdirAll(filepath.Dir(m.persistPath), 0o755); err != nil {
+		return err
+	}
+	// Snapshot aus Map bauen
+	snap := Snapshot{Items: make([]File, 0, len(m.items))}
+	for _, it := range m.items {
+		snap.Items = append(snap.Items, it)
+	}
+	// atomar schreiben
+	tmp := m.persistPath + ".tmp"
+	f, err := os.Create(tmp)
+	if err != nil {
+		return err
+	}
+	enc := json.NewEncoder(f)
+	enc.SetIndent("", "  ")
+	if err := enc.Encode(&snap); err != nil {
+		f.Close()
+		_ = os.Remove(tmp)
+		return err
+	}
+	if err := f.Sync(); err != nil {
+		f.Close()
+		_ = os.Remove(tmp)
+		return err
+	}
+	if err := f.Close(); err != nil {
+		_ = os.Remove(tmp)
+		return err
+	}
+	return os.Rename(tmp, m.persistPath)
 }
 
 /*** Store ***/
@@ -102,8 +172,9 @@ func (m *MemStore) Create(_ context.Context, name string) (File, error) {
 	if err != nil {
 		return File{}, err
 	}
-	it := File{ID: uid, Name: name, UpdatedAt: now}
+	it := File{ID: uid, Name: name, UpdatedAt: now, Owner: m.self}
 	m.items[it.ID] = it
+	_ = m.saveLocked()
 	m.emit(it)
 	return it, nil
 }
@@ -120,9 +191,13 @@ func (m *MemStore) Rename(_ context.Context, id ID, newName string) (File, error
 	if !ok || it.Deleted {
 		return File{}, ErrNotFound
 	}
-	it.Name = newName
+	if it.Owner != "" && it.Owner != m.self { // ← nur Owner
+		return File{}, ErrForbidden
+	}
+	it.Name = strings.TrimSpace(newName)
 	it.UpdatedAt = time.Now().UnixNano()
 	m.items[id] = it
+	_ = m.saveLocked()
 	m.emit(it)
 	return it, nil
 }
@@ -134,16 +209,46 @@ func (m *MemStore) Delete(_ context.Context, id ID) (File, error) {
 	if !ok {
 		return File{}, ErrNotFound
 	}
+	if it.Owner != "" && it.Owner != m.self { // ← nur Owner
+		return File{}, ErrForbidden
+	}
 	if it.Deleted {
 		return it, nil
 	}
 	it.Deleted = true
 	it.UpdatedAt = time.Now().UnixNano()
 	m.items[id] = it
+	_ = m.saveLocked()
 	m.emit(it)
 	return it, nil
 }
 
+func (m *MemStore) TakeoverOwner(_ context.Context, id ID, newOwner string) (File, error) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	it, ok := m.items[id]
+	if !ok || it.Deleted {
+		return File{}, ErrNotFound
+	}
+	newOwner = strings.TrimSpace(newOwner)
+	if newOwner == "" {
+		return File{}, ErrBadInput
+	}
+	// Sicherheit: nur für sich selbst übernehmen
+	if newOwner != m.self {
+		return File{}, ErrForbidden
+	}
+	if it.Owner == newOwner {
+		return it, nil
+	}
+	it.Owner = newOwner
+	it.UpdatedAt = time.Now().UnixNano()
+	m.items[id] = it
+	_ = m.saveLocked()
+	m.emitLocked(it)
+	return it, nil
+}
+
 /*** Replicable ***/
 
 func (m *MemStore) Snapshot(_ context.Context) (Snapshot, error) {
@@ -159,13 +264,22 @@ func (m *MemStore) Snapshot(_ context.Context) (Snapshot, error) {
 func (m *MemStore) ApplyRemote(_ context.Context, s Snapshot) error {
 	m.mu.Lock()
 	defer m.mu.Unlock()
+	changed := false
 	for _, ri := range s.Items {
 		li, ok := m.items[ri.ID]
 		if !ok || ri.UpdatedAt > li.UpdatedAt {
+			// Owner nie überschreiben, außer er ist leer
+			if ok && li.Owner != "" && ri.Owner != "" && ri.Owner != li.Owner {
+				ri.Owner = li.Owner
+			}
 			m.items[ri.ID] = ri
+			changed = true
 			m.emitLocked(ri)
 		}
 	}
+	if changed {
+		_ = m.saveLocked() // ← NEU
+	}
 	return nil
 }
 

internal/filesvc/store.go

@@ -13,11 +13,11 @@ import (
 type ID = string
 
 type File struct {
-	ID   ID     `json:"id"`
-	Name string `json:"name"`
-	// weitere Metadaten optional: Size, Hash, Owner, Tags, ...
-	UpdatedAt int64 `json:"updatedAt"` // UnixNano für LWW
-	Deleted   bool  `json:"deleted"`   // Tombstone für Mesh-Delete
+	ID        ID     `json:"id"`
+	Name      string `json:"name"`
+	UpdatedAt int64  `json:"updatedAt"` // UnixNano für LWW
+	Deleted   bool   `json:"deleted"`   // Tombstone für Mesh-Delete
+	Owner     string `json:"owner"`     //AdvertURL/NodeID des Erzeugers
 }
 
 /*** Fehler ***/
@@ -36,11 +36,10 @@ type Store interface {
 	// Lesen & Auflisten
 	Get(ctx context.Context, id ID) (File, error)
 	List(ctx context.Context, next ID, limit int) (items []File, nextOut ID, err error)
-
-	// Mutationen mit LWW-Semantik (UpdatedAt wird intern gesetzt, außer bei ApplyRemote)
 	Create(ctx context.Context, name string) (File, error)
-	Rename(ctx context.Context, id ID, newName string) (File, error)
-	Delete(ctx context.Context, id ID) (File, error)
+	Rename(ctx context.Context, id ID, newName string) (File, error) // nur Owner darf
+	Delete(ctx context.Context, id ID) (File, error)                 // nur Owner darf
+	TakeoverOwner(ctx context.Context, id ID, newOwner string) (File, error)
 }
 
 /*** Mesh-Replikation ***/

internal/mesh/mesh.go

@@ -12,6 +12,7 @@ import (
 	"hash/crc32"
 	"io"
 	"log"
+	"math/rand/v2"
 	"net"
 	"net/http"
 	"os"
@@ -33,6 +34,15 @@ type Config struct {
 	DiscoveryAddress string        // "239.8.8.8:9898"
 	PeerTTL          time.Duration // wie lange darf ein Peer inaktiv sein (Default siehe unten)
 	PruneInterval    time.Duration // wie oft wird gepruned
+
+	SyncInterval time.Duration
+	Fanout       int
+
+	// NEU:
+	HelloInterval time.Duration // wie oft pingen
+	HelloFanout   int           // wie viele Peers pro Tick
+
+	BlobTimeout time.Duration
 }
 
 type Peer struct {
@@ -47,6 +57,7 @@ type Item struct {
 	Name      string `json:"name"`
 	UpdatedAt int64  `json:"updatedAt"`
 	Deleted   bool   `json:"deleted"` // <— NEU: Tombstone für Deletes
+	Owner     string `json:"owner"`
 }
 
 type Snapshot struct {
@@ -92,6 +103,8 @@ func (n *Node) RemovePeer(url string) bool {
 	return false
 }
 
+func (n *Node) Config() Config { return n.cfg }
+
 // PruneNow entfernt alle Peers, deren LastSeen vor cutoff liegt (Seeds bleiben).
 func (n *Node) PruneNow(cutoff time.Time) int {
 	n.mu.Lock()
@@ -187,21 +200,38 @@ func (n *Node) helloHandler(w http.ResponseWriter, r *http.Request) {
 		http.Error(w, "bad signature", http.StatusUnauthorized)
 		return
 	}
-	var p Peer
-	if err := json.Unmarshal(body, &p); err != nil {
+	var req struct {
+		URL string `json:"url"`
+	}
+	if err := json.Unmarshal(body, &req); err != nil || strings.TrimSpace(req.URL) == "" {
 		http.Error(w, "bad json", http.StatusBadRequest)
 		return
 	}
-	p.LastSeen = time.Now()
+
+	// Peer anlegen (falls neu) und LastSeen setzen
 	n.mu.Lock()
-	if existing, ok := n.peers[p.URL]; ok {
-		existing.LastSeen = p.LastSeen
-	} else if p.URL != n.self.URL {
-		cp := p
-		n.peers[p.URL] = &cp
+	if req.URL != n.self.URL {
+		if p, ok := n.peers[req.URL]; ok {
+			p.LastSeen = time.Now()
+		} else {
+			cp := Peer{URL: req.URL, LastSeen: time.Now()} // weitere Felder wie bekannt
+			n.peers[req.URL] = &cp
+		}
+	}
+	n.mu.Unlock()
+
+	w.WriteHeader(http.StatusOK)
+}
+
+func (n *Node) touchPeer(url string) {
+	if strings.TrimSpace(url) == "" {
+		return
+	}
+	n.mu.Lock()
+	if p, ok := n.peers[url]; ok {
+		p.LastSeen = time.Now()
 	}
 	n.mu.Unlock()
-	w.WriteHeader(http.StatusNoContent)
 }
 
 func (n *Node) peersHandler(w http.ResponseWriter, r *http.Request) {
@@ -280,6 +310,12 @@ func (n *Node) Serve() error {
 		n.loopAntiEntropy()
 	}()
 
+	n.wg.Add(1)
+	go func() {
+		defer n.wg.Done()
+		n.loopHello()
+	}()
+
 	// http server
 	errc := make(chan error, 1)
 	go func() {
@@ -464,28 +500,100 @@ func (n *Node) loopBeaconRecv() {
 /*** Outgoing ***/
 
 func (n *Node) sendHello(url string) error {
-	p := n.self
-	b, _ := json.Marshal(p)
+	b, _ := json.Marshal(struct {
+		URL string `json:"url"`
+	}{URL: n.self.URL})
 	req, _ := http.NewRequest(http.MethodPost, strings.TrimRight(url, "/")+"/mesh/hello", bytes.NewReader(b))
 	req.Header.Set("X-Mesh-Sig", n.sign(b))
+
 	resp, err := n.client.Do(req)
-	if err == nil {
-		io.Copy(io.Discard, resp.Body)
-		resp.Body.Close()
+	if err != nil {
+		return err
+	}
+	io.Copy(io.Discard, resp.Body)
+	resp.Body.Close()
+	if resp.StatusCode == http.StatusOK {
+		n.touchPeer(url) // eigenen Blick auf den Peer direkt als „gesehen“ markieren
+		return nil
+	}
+	return fmt.Errorf("hello %s: %s", url, resp.Status)
+}
+
+func (n *Node) loopHello() {
+	interval := n.cfg.HelloInterval
+	if interval <= 0 {
+		interval = 20 * time.Second
+	}
+	fanout := n.cfg.HelloFanout
+	if fanout <= 0 {
+		fanout = 8
+	}
+
+	t := time.NewTicker(interval)
+	defer t.Stop()
+
+	for {
+		select {
+		case <-n.stop:
+			return
+		case <-t.C:
+		}
+
+		// Liste der *bekannten* Peers (nicht nur Seeds)
+		n.mu.RLock()
+		targets := make([]string, 0, len(n.peers))
+		for url := range n.peers {
+			if url != n.self.URL {
+				targets = append(targets, url)
+			}
+		}
+		n.mu.RUnlock()
+		if len(targets) == 0 {
+			continue
+		}
+
+		// zufällig mischen und auf Fanout begrenzen
+		rand.Shuffle(len(targets), func(i, j int) { targets[i], targets[j] = targets[j], targets[i] })
+		if fanout < len(targets) {
+			targets = targets[:fanout]
+		}
+
+		// leicht parallel pingen
+		var wg sync.WaitGroup
+		for _, u := range targets {
+			u := u
+			wg.Add(1)
+			go func() {
+				defer wg.Done()
+				_ = n.sendHello(u)
+			}()
+		}
+		wg.Wait()
 	}
-	return err
 }
 
 func (n *Node) sendSync(url string, s Snapshot) error {
 	b, _ := json.Marshal(s)
 	req, _ := http.NewRequest(http.MethodPost, strings.TrimRight(url, "/")+"/mesh/sync", bytes.NewReader(b))
 	req.Header.Set("X-Mesh-Sig", n.sign(b))
+
+	ctx, cancel := context.WithTimeout(context.Background(), 4*time.Second)
+	defer cancel()
+	req = req.WithContext(ctx)
+
 	resp, err := n.client.Do(req)
-	if err == nil {
-		io.Copy(io.Discard, resp.Body)
-		resp.Body.Close()
+	if err != nil {
+		return err
 	}
-	return err
+	defer resp.Body.Close()
+	io.Copy(io.Discard, resp.Body)
+
+	if resp.StatusCode != http.StatusOK {
+		return fmt.Errorf("sync %s: %s", url, resp.Status)
+	}
+
+	n.touchPeer(url)
+	return nil
 }
 
 // PeerList liefert eine Kopie der bekannten Peers inkl. Self.
@@ -605,14 +713,37 @@ func (n *Node) blobHandler(w http.ResponseWriter, r *http.Request) {
 	_, _ = io.Copy(w, rc)
 }
 
-// interner Helper: signierter Blob-Request an einen Peer
-func (n *Node) sendBlobRequest(url string, id string) (*http.Response, error) {
+// sendBlobRequest schickt eine signierte Anfrage an /mesh/blob und liefert die Response
+// zurück (Caller MUSS resp.Body schließen!). Bei HTTP 200 wird der Peer als gesehen markiert.
+func (n *Node) sendBlobRequest(url, id string) (*http.Response, error) {
 	b, _ := json.Marshal(struct {
 		ID string `json:"id"`
 	}{ID: id})
+
 	req, _ := http.NewRequest(http.MethodPost, strings.TrimRight(url, "/")+"/mesh/blob", bytes.NewReader(b))
 	req.Header.Set("X-Mesh-Sig", n.sign(b))
-	return n.client.Do(req)
+	req.Header.Set("Content-Type", "application/json")
+
+	// ❗ WICHTIG: kein kurzer Timeout. Optional: großer Timeout aus Config
+	ctx := context.Background()
+	if n.cfg.BlobTimeout > 0 {
+		var cancel context.CancelFunc
+		ctx, cancel = context.WithTimeout(context.Background(), n.cfg.BlobTimeout)
+		defer cancel()
+	}
+	req = req.WithContext(ctx)
+
+	resp, err := n.client.Do(req)
+	if err != nil {
+		return nil, err
+	}
+	if resp.StatusCode == http.StatusOK {
+		n.touchPeer(url) // ausgehender Erfolg zählt als "gesehen"
+		return resp, nil
+	}
+	io.Copy(io.Discard, resp.Body)
+	resp.Body.Close()
+	return nil, fmt.Errorf("blob %s from %s: %s", id, url, resp.Status)
 }
 
 // Öffentliche Methode: versuche Blob bei irgendeinem Peer zu holen