Add multi-file upload that zips files server-side

internal/file/upload_multi.go

@@ -0,0 +1,57 @@
+package file
+
+import (
+	"net/http"
+	"strconv"
+	"time"
+
+	"github.com/gin-gonic/gin"
+)
+
+// UploadMulti accepts up to 10 files, zips them server-side, and returns a single download/view key.
+func (h *Handler) UploadMulti(c *gin.Context) {
+	if err := c.Request.ParseMultipartForm(0); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+		return
+	}
+
+	form, err := c.MultipartForm()
+	if err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid multipart form"})
+		return
+	}
+
+	files := form.File["files"]
+	if len(files) == 0 {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "missing files"})
+		return
+	}
+	if len(files) > 10 {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "too many files (max 10)"})
+		return
+	}
+
+	once := c.PostForm("once") == "true"
+
+	durationStr := c.PostForm("duration")
+	hours, err := strconv.Atoi(durationStr)
+	if err != nil || hours <= 0 {
+		hours = 24
+	}
+	duration := time.Duration(hours) * time.Hour
+
+	record, err := h.service.UploadBundle(files, once, duration)
+	if err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
+		return
+	}
+
+	c.JSON(http.StatusOK, gin.H{
+		"id":          record.ID,
+		"deletion_id": record.DeletionID,
+		"filename":    record.Filename,
+		"size":        record.Size,
+		"expires_at":  record.ExpiresAt,
+		"view_key":    record.ViewID,
+	})
+}