fix(server): race WebSocket, SVG refusé, rows.Err, time.NewTicker

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

server/db/db.go

@@ -117,6 +117,9 @@ func (d *DB) GetAgents() ([]models.Agent, error) {
 		}
 		agents = append(agents, a)
 	}
+	if err := rows.Err(); err != nil {
+		return nil, err
+	}
 	return agents, nil
 }
 
@@ -143,6 +146,9 @@ func (d *DB) GetMetricsHistory(agentID string, from, to int64) ([]map[string]int
 			"hdd_used": hddUsed, "hdd_total": hddTotal,
 		})
 	}
+	if err := rows.Err(); err != nil {
+		return nil, err
+	}
 	return result, nil
 }
 

server/handlers/icons.go

@@ -5,6 +5,7 @@ import (
 	"image"
 	_ "image/jpeg"
 	"image/png"
+	"io"
 	"net/http"
 	"strings"
 
@@ -40,18 +41,15 @@ func IconUploadHandler(database *db.DB) http.HandlerFunc {
 			mime = "image/png"
 		}
 
+		// SVG refusé (risque XSS)
 		if strings.Contains(mime, "svg") {
-			var buf bytes.Buffer
-			buf.ReadFrom(file)
-			if err := database.SaveIcon(agentID, buf.Bytes(), "image/svg+xml"); err != nil {
-				http.Error(w, err.Error(), 500)
-				return
-			}
-			w.WriteHeader(http.StatusNoContent)
+			http.Error(w, "SVG non supporté — utilisez PNG, JPG ou WEBP", 400)
 			return
 		}
 
-		img, _, err := image.Decode(file)
+		// Limite de taille
+		limited := io.LimitReader(file, 2<<20)
+		img, _, err := image.Decode(limited)
 		if err != nil {
 			http.Error(w, "image invalide", 400)
 			return

server/main.go

@@ -60,7 +60,9 @@ func main() {
 	}
 
 	go func() {
-		for range time.Tick(time.Minute) {
+		ticker := time.NewTicker(time.Minute)
+		defer ticker.Stop()
+		for range ticker.C {
 			srvCfg, _ := database.GetServerConfig()
 			_ = database.PruneOldMetrics(srvCfg.RetentionDays)
 			_ = database.MarkOffline(30)

server/websocket/hub.go

@@ -8,24 +8,35 @@ import (
 	"github.com/gorilla/websocket"
 )
 
+type client struct {
+	conn *websocket.Conn
+	send chan []byte
+	mu   sync.Mutex
+}
+
 type Hub struct {
 	mu      sync.RWMutex
-	clients map[*websocket.Conn]struct{}
+	clients map[*websocket.Conn]*client
 }
 
 func NewHub() *Hub {
-	return &Hub{clients: make(map[*websocket.Conn]struct{})}
+	return &Hub{clients: make(map[*websocket.Conn]*client)}
 }
 
 func (h *Hub) Register(conn *websocket.Conn) {
+	c := &client{conn: conn, send: make(chan []byte, 64)}
 	h.mu.Lock()
-	h.clients[conn] = struct{}{}
+	h.clients[conn] = c
 	h.mu.Unlock()
+	go c.writePump()
 }
 
 func (h *Hub) Unregister(conn *websocket.Conn) {
 	h.mu.Lock()
+	if c, ok := h.clients[conn]; ok {
+		close(c.send)
 		delete(h.clients, conn)
+	}
 	h.mu.Unlock()
 }
 
@@ -37,9 +48,11 @@ func (h *Hub) Broadcast(msg interface{}) {
 	}
 	h.mu.RLock()
 	defer h.mu.RUnlock()
-	for conn := range h.clients {
-		if err := conn.WriteMessage(websocket.TextMessage, data); err != nil {
-			log.Printf("[ws] write: %v", err)
+	for _, c := range h.clients {
+		select {
+		case c.send <- data:
+		default:
+			// canal plein, client lent — on skip
 		}
 	}
 }
@@ -49,3 +62,13 @@ func (h *Hub) Count() int {
 	defer h.mu.RUnlock()
 	return len(h.clients)
 }
+
+func (c *client) writePump() {
+	defer c.conn.Close()
+	for data := range c.send {
+		if err := c.conn.WriteMessage(websocket.TextMessage, data); err != nil {
+			log.Printf("[ws] write: %v", err)
+			return
+		}
+	}
+}