feat: one-page panel - shell with Машины, Терминал and Настройки, pages as fragments, forms sent in place

internal/server/frag.go

@@ -0,0 +1,88 @@
+package server
+
+import (
+	"bytes"
+	"html/template"
+	"log"
+	"net/http"
+)
+
+// A panel page is either a fragment - its content alone, for the shell to put
+// in place without reloading - or the shell with that content already in it.
+
+func isFrag(r *http.Request) bool { return r.URL.Query().Get("frag") == "1" }
+
+// pageView is the shell's view a page is shown in; the machine pages (Порты,
+// Статус, Изменить) open as a dialog over the machines view.
+var pageView = map[string]string{"dashboard": "dashboard", "settings": "settings"}
+
+func (s *Server) renderPage(w http.ResponseWriter, r *http.Request, name string, data map[string]any) {
+	w.Header().Set("Content-Type", "text/html; charset=utf-8")
+	w.Header().Set("Cache-Control", "no-store")
+	if data == nil {
+		data = map[string]any{}
+	}
+	data["IsAdmin"] = s.currentAdmin(r).IsAdmin()
+	if !isFrag(r) {
+		if _, ok := pageView[name]; !ok {
+			// A machine page asked for whole: the machines view with it in
+			// a dialog.
+			s.shell(w, r, map[string]any{"View": "dashboard", "Dialog": r.URL.Path})
+			return
+		}
+	}
+	var body bytes.Buffer
+	if err := s.tmpl.ExecuteTemplate(&body, name+"-body", data); err != nil {
+		log.Printf("template %s: %v", name, err)
+		http.Error(w, "internal error", http.StatusInternalServerError)
+		return
+	}
+	if isFrag(r) {
+		_, _ = w.Write(body.Bytes())
+		return
+	}
+	data["View"] = pageView[name]
+	data["Body"] = template.HTML(body.String())
+	s.shell(w, r, data)
+}
+
+// shell writes the shell page with data (View, Body, Open, Dialog).
+func (s *Server) shell(w http.ResponseWriter, r *http.Request, data map[string]any) {
+	data["IsAdmin"] = s.currentAdmin(r).IsAdmin()
+	if data["View"] == "dashboard" && data["Body"] == nil {
+		// The machines list under a dialog: draw it too.
+		var body bytes.Buffer
+		if err := s.tmpl.ExecuteTemplate(&body, "dashboard-body", s.dashboardData(r)); err == nil {
+			data["Body"] = template.HTML(body.String())
+		}
+	}
+	w.Header().Set("Content-Type", "text/html; charset=utf-8")
+	w.Header().Set("Cache-Control", "no-store")
+	if err := s.tmpl.ExecuteTemplate(w, "app.html", data); err != nil {
+		log.Printf("template app.html: %v", err)
+	}
+}
+
+// handleShell serves the shell alone: the terminal view, or with a pane of
+// a machine opened at once (/agents/{id}/terminal, /agents/{id}/files).
+func (s *Server) handleShell(w http.ResponseWriter, r *http.Request) {
+	data := map[string]any{"View": "terminal"}
+	if id := r.PathValue("id"); id != "" {
+		a, _ := s.db.GetAgent(id)
+		if a == nil {
+			http.NotFound(w, r)
+			return
+		}
+		kind := "term"
+		switch r.PathValue("kind") {
+		case "", "terminal":
+		case "files":
+			kind = "files"
+		default:
+			http.NotFound(w, r)
+			return
+		}
+		data["Open"] = map[string]any{"kind": kind, "agent": map[string]string{"id": a.ID, "name": a.Name, "host": a.Hostname, "user": a.TerminalUser()}}
+	}
+	s.shell(w, r, data)
+}