80 lines
2.4 KiB
Go
80 lines
2.4 KiB
Go
package server
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import (
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"encoding/json"
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"log"
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"net/http"
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"github.com/x-grk/longpolling-remote-access/internal/proto"
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)
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// The browser terminal talks to the server over plain HTTP long-polling (the
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// same transport the agent uses), so it works through any reverse proxy without
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// WebSocket upgrade support.
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// POST /api/panel/term/{agentID}/open - create a terminal session.
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func (s *Server) handlePanelOpen(w http.ResponseWriter, r *http.Request) {
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agentID := r.PathValue("agentID")
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agent, err := s.db.GetAgent(agentID)
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if err != nil || agent == nil {
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log.Printf("panel open: agent %q not found (err=%v)", agentID, err)
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http.NotFound(w, r)
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return
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}
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sess := s.hub.CreateSession(agentID, agent.LoginUser)
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if admin := s.currentAdmin(r); admin != nil {
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s.db.Audit(admin.ID, agentID, "open_terminal:"+agent.TerminalUser())
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}
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writeJSON(w, map[string]string{"session_id": sess.ID})
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}
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// GET /api/panel/term/{sid}/out - long-poll for PTY output.
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func (s *Server) handlePanelOut(w http.ResponseWriter, r *http.Request) {
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sess := s.hub.Session(r.PathValue("sid"))
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if sess == nil {
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writeJSON(w, map[string]any{"closed": true})
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return
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}
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msgs, alive := sess.PollOut(pollHold)
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if !alive {
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writeJSON(w, map[string]any{"closed": true})
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return
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}
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writeJSON(w, map[string]any{"frames": msgs})
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}
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// panelInMsg is what the browser posts for keystrokes/resize.
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type panelInMsg struct {
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T string `json:"t"` // "i" input, "r" resize
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D string `json:"d,omitempty"`
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Cols uint16 `json:"cols,omitempty"`
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Rows uint16 `json:"rows,omitempty"`
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}
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// POST /api/panel/term/{sid}/in - send keystrokes/resize to the agent PTY.
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func (s *Server) handlePanelIn(w http.ResponseWriter, r *http.Request) {
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sess := s.hub.Session(r.PathValue("sid"))
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if sess == nil {
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http.Error(w, "closed", http.StatusGone)
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return
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}
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var m panelInMsg
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if err := json.NewDecoder(http.MaxBytesReader(w, r.Body, 1<<20)).Decode(&m); err != nil {
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http.Error(w, "bad request", http.StatusBadRequest)
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return
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}
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switch m.T {
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case "i":
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sess.PushIn(proto.InFrame{Type: proto.FrameStdin, Data: m.D})
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case "r":
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sess.PushIn(proto.InFrame{Type: proto.FrameResize, Cols: m.Cols, Rows: m.Rows})
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}
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w.WriteHeader(http.StatusNoContent)
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}
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// POST /api/panel/term/{sid}/close - tear the session down.
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func (s *Server) handlePanelClose(w http.ResponseWriter, r *http.Request) {
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s.hub.CloseSession(r.PathValue("sid"))
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w.WriteHeader(http.StatusNoContent)
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}
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