Add missing files, update style

internal/web/reorder.go

@@ -0,0 +1,53 @@
+package web
+
+import (
+	"fmt"
+	"log"
+	"net/http"
+	"strconv"
+
+	"pcap-web-tools/internal/pcap"
+)
+
+type reorderPage struct {
+	MaxUpload string
+	Error     string
+}
+
+func (s *Server) handleReorderForm(w http.ResponseWriter, r *http.Request) {
+	s.render(w, http.StatusOK, "reorder.html", "/reorder", reorderPage{MaxUpload: s.maxUpload()})
+}
+
+func (s *Server) handleReorder(w http.ResponseWriter, r *http.Request) {
+	page := reorderPage{MaxUpload: s.maxUpload()}
+	fail := func(status int, msg string) {
+		page.Error = msg
+		s.render(w, status, "reorder.html", "/reorder", page)
+	}
+
+	file, hdr, status, msg := s.parseUpload(w, r)
+	if status != 0 {
+		fail(status, msg)
+		return
+	}
+	defer file.Close()
+
+	// Indexing reads the whole file, so problems are reported on the page
+	// before any of the download is sent.
+	ro, err := pcap.NewReorder(file, hdr.Size)
+	if err != nil {
+		fail(http.StatusBadRequest, hdr.Filename+": "+err.Error())
+		return
+	}
+
+	w.Header().Set("Content-Type", "application/vnd.tcpdump.pcap")
+	w.Header().Set("Content-Disposition", fmt.Sprintf("attachment; filename=%q", uploadStem(hdr)+"_reordered.pcap"))
+	// Summary for scripted clients; browsers just save the file.
+	w.Header().Set("X-Pcap-Packets", strconv.Itoa(ro.Packets()))
+	w.Header().Set("X-Pcap-Out-Of-Order", strconv.Itoa(ro.OutOfOrder()))
+	w.Header().Set("X-Pcap-Truncated", strconv.FormatBool(ro.Truncated()))
+	if _, err := ro.WriteTo(w); err != nil {
+		// The response has already started, so the error cannot be shown on the page.
+		log.Printf("reorder %q: %v", hdr.Filename, err)
+	}
+}