530 lines
17 KiB
Go
530 lines
17 KiB
Go
package mcp
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import (
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"context"
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"crypto/rand"
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"encoding/hex"
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"encoding/json"
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"fmt"
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"io"
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"net/http"
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"sync"
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"time"
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"github.com/wjyhk/vps-commander/internal/auth"
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)
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// MCP Protocol / JSON-RPC 2.0 Types
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type JSONRPCRequest struct {
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JSONRPC string `json:"jsonrpc"`
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ID any `json:"id,omitempty"`
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Method string `json:"method"`
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Params json.RawMessage `json:"params,omitempty"`
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}
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type JSONRPCResponse struct {
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JSONRPC string `json:"jsonrpc"`
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ID any `json:"id,omitempty"`
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Result any `json:"result,omitempty"`
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Error *JSONRPCError `json:"error,omitempty"`
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}
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type JSONRPCError struct {
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Code int `json:"code"`
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Message string `json:"message"`
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Data any `json:"data,omitempty"`
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}
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// Tool Definition Structures
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type Tool struct {
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Name string `json:"name"`
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Description string `json:"description"`
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InputSchema InputSchema `json:"inputSchema"`
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}
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type InputSchema struct {
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Type string `json:"type"`
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Properties map[string]PropertyDef `json:"properties"`
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Required []string `json:"required,omitempty"`
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}
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type PropertyDef struct {
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Type string `json:"type"`
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Description string `json:"description"`
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}
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type CallToolParams struct {
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Name string `json:"name"`
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Arguments json.RawMessage `json:"arguments"`
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}
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type TextContent struct {
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Type string `json:"type"`
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Text string `json:"text"`
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}
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type CallToolResult struct {
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Content []TextContent `json:"content"`
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IsError bool `json:"isError,omitempty"`
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}
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// Backend interface for invoking actions
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type ActionBackend interface {
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ListDevices(ctx context.Context) (any, error)
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ExecCommand(ctx context.Context, clientIP, device, command, workdir string, timeout int) (any, error)
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ReadFile(ctx context.Context, clientIP, device, path string, offset, limit int64) (any, error)
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WriteFile(ctx context.Context, clientIP, device, path, content string) (any, error)
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EditBlock(ctx context.Context, clientIP, device, path, oldText, newText string) (any, error)
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}
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type ExtendedBackend interface {
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ReadMultipleFiles(ctx context.Context, clientIP, device string, paths []string, limit int64) (any, error)
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CreateDirectory(ctx context.Context, clientIP, device, path string) (any, error)
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MoveFile(ctx context.Context, clientIP, device, source, destination string) (any, error)
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ListProcesses(ctx context.Context, clientIP, device string) (any, error)
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}
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type AgentMCPBackend interface {
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ListAgentMCP(ctx context.Context, device string) (any, error)
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CallAgentMCP(ctx context.Context, clientIP, device, server, tool string, args any) (any, error)
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}
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type SecurityGate interface {
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AuthorizeMCP(device, action, clientIP string) error
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}
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type Server struct {
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Backend ActionBackend
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Auth *auth.Manager
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mu sync.RWMutex
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sessions map[string]chan []byte
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}
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func NewServer(backend ActionBackend, authMgr *auth.Manager) *Server {
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return &Server{
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Backend: backend,
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Auth: authMgr,
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sessions: make(map[string]chan []byte),
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}
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}
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func (s *Server) newSessionID() string {
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b := make([]byte, 16)
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_, _ = rand.Read(b)
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return hex.EncodeToString(b)
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}
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// SSE Handler: GET /mcp/sse
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func (s *Server) HandleSSE(w http.ResponseWriter, r *http.Request) {
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if r.Method != http.MethodGet {
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http.Error(w, "method not allowed", http.StatusMethodNotAllowed)
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return
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}
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flusher, ok := w.(http.Flusher)
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if !ok {
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http.Error(w, "streaming unsupported", http.StatusInternalServerError)
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return
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}
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sessionID := s.newSessionID()
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msgCh := make(chan []byte, 64)
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s.mu.Lock()
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s.sessions[sessionID] = msgCh
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s.mu.Unlock()
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defer func() {
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s.mu.Lock()
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delete(s.sessions, sessionID)
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close(msgCh)
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s.mu.Unlock()
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}()
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w.Header().Set("Content-Type", "text/event-stream")
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w.Header().Set("Cache-Control", "no-cache")
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w.Header().Set("Connection", "keep-alive")
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w.Header().Set("Access-Control-Allow-Origin", "*")
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// Endpoint event telling client where to send POST messages
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endpointURI := fmt.Sprintf("/mcp/message?sessionId=%s", sessionID)
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fmt.Fprintf(w, "event: endpoint\ndata: %s\n\n", endpointURI)
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flusher.Flush()
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notify := r.Context().Done()
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ticker := time.NewTicker(15 * time.Second)
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defer ticker.Stop()
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for {
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select {
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case <-notify:
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return
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case msg, ok := <-msgCh:
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if !ok {
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return
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}
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fmt.Fprintf(w, "event: message\ndata: %s\n\n", string(msg))
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flusher.Flush()
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case <-ticker.C:
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fmt.Fprintf(w, ": keepalive\n\n")
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flusher.Flush()
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}
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}
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}
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// Message Handler: POST /mcp/message
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func (s *Server) HandleMessage(w http.ResponseWriter, r *http.Request) {
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if r.Method != http.MethodPost {
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http.Error(w, "method not allowed", http.StatusMethodNotAllowed)
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return
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}
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sessionID := r.URL.Query().Get("sessionId")
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s.mu.RLock()
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ch, exists := s.sessions[sessionID]
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s.mu.RUnlock()
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body, err := io.ReadAll(http.MaxBytesReader(w, r.Body, 1024*1024))
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if err != nil {
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http.Error(w, "read error", http.StatusBadRequest)
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return
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}
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var req JSONRPCRequest
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if err := json.Unmarshal(body, &req); err != nil {
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http.Error(w, "invalid json-rpc", http.StatusBadRequest)
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return
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}
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resp := s.handleRequest(r.Context(), r, req)
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// If session exists, push response via SSE; otherwise reply directly via HTTP
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respBytes, _ := json.Marshal(resp)
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if exists && ch != nil {
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select {
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case ch <- respBytes:
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default:
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}
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w.WriteHeader(http.StatusAccepted)
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_, _ = w.Write([]byte("accepted"))
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} else {
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w.Header().Set("Content-Type", "application/json")
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_, _ = w.Write(respBytes)
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}
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}
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func (s *Server) handleRequest(ctx context.Context, r *http.Request, req JSONRPCRequest) JSONRPCResponse {
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switch req.Method {
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case "initialize":
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return JSONRPCResponse{
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JSONRPC: "2.0",
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ID: req.ID,
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Result: map[string]any{
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"protocolVersion": "2024-11-05",
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"serverInfo": map[string]string{
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"name": "vps-commander",
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"version": "1.2.0",
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},
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"capabilities": map[string]any{
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"tools": map[string]bool{"listChanged": false},
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},
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},
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}
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case "notifications/initialized":
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return JSONRPCResponse{JSONRPC: "2.0"}
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case "ping":
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return JSONRPCResponse{JSONRPC: "2.0", ID: req.ID, Result: map[string]string{}}
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case "tools/list":
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tools := []Tool{
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{
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Name: "list_devices",
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Description: "列出当前所有已注册的 VPS 节点及其在线状态与系统架构",
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InputSchema: InputSchema{
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Type: "object",
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Properties: map[string]PropertyDef{},
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},
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},
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{
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Name: "exec_command",
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Description: "在指定受控节点（默认本机 local）执行任意 Shell 命令并返回输出和退出码",
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InputSchema: InputSchema{
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Type: "object",
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Properties: map[string]PropertyDef{
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"device": {Type: "string", Description: "目标设备节点名称/别名（缺省则在当前 Hub 所在节点执行）"},
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"command": {Type: "string", Description: "需要执行的 Shell 命令"},
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"workdir": {Type: "string", Description: "可选的工作目录绝对路径"},
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"timeout": {Type: "integer", Description: "超时时间（秒，默认 30，最大 300）"},
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},
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Required: []string{"command"},
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},
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},
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{
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Name: "read_file",
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Description: "从指定受控节点读取文件内容（支持偏移与字节分页）",
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InputSchema: InputSchema{
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Type: "object",
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Properties: map[string]PropertyDef{
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"device": {Type: "string", Description: "目标设备节点名称/别名（缺省为 local）"},
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"path": {Type: "string", Description: "文件的绝对路径"},
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"offset": {Type: "integer", Description: "读取的起始字节偏移量（默认 0）"},
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"limit": {Type: "integer", Description: "读取的最大字节数（默认 262144，最大 1048576）"},
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},
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Required: []string{"path"},
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},
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},
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{Name: "read_multiple_files", Description: "一次读取多个文件", InputSchema: InputSchema{Type: "object", Properties: map[string]PropertyDef{"device": {Type: "string", Description: "目标设备"}, "paths": {Type: "array", Description: "文件路径数组"}, "limit": {Type: "integer", Description: "单文件最大字节数"}}, Required: []string{"paths"}}},
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{Name: "create_directory", Description: "创建目录", InputSchema: InputSchema{Type: "object", Properties: map[string]PropertyDef{"device": {Type: "string", Description: "目标设备"}, "path": {Type: "string", Description: "目录路径"}}, Required: []string{"path"}}},
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{Name: "move_file", Description: "移动或重命名文件", InputSchema: InputSchema{Type: "object", Properties: map[string]PropertyDef{"device": {Type: "string", Description: "目标设备"}, "source": {Type: "string", Description: "源路径"}, "destination": {Type: "string", Description: "目标路径"}}, Required: []string{"source", "destination"}}},
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{Name: "list_processes", Description: "列出受控节点当前进程", InputSchema: InputSchema{Type: "object", Properties: map[string]PropertyDef{"device": {Type: "string", Description: "目标设备"}}}},
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{
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Name: "edit_block",
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Description: "对指定文件执行唯一文本块的原子替换；old_text 必须恰好匹配一次",
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InputSchema: InputSchema{Type: "object", Properties: map[string]PropertyDef{"device": {Type: "string", Description: "目标节点名称"}, "path": {Type: "string", Description: "目标文件路径"}, "old_text": {Type: "string", Description: "必须唯一匹配的原文本块"}, "new_text": {Type: "string", Description: "替换后的文本块"}}, Required: []string{"path", "old_text", "new_text"}},
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},
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{
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Name: "write_file",
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Description: "向指定受控节点创建或覆写文件",
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InputSchema: InputSchema{
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Type: "object",
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Properties: map[string]PropertyDef{
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"device": {Type: "string", Description: "目标设备节点名称/别名（缺省为 local）"},
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"path": {Type: "string", Description: "文件的绝对路径"},
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"content": {Type: "string", Description: "要写入的文件文本内容"},
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},
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Required: []string{"path", "content"},
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},
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},
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{
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Name: "list_agent_mcp", Description: "列出指定 Agent 当前通过 Hub 动态挂载的 MCP 服务及状态",
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InputSchema: InputSchema{Type: "object", Properties: map[string]PropertyDef{"device": {Type: "string", Description: "目标 Agent 节点名称"}}, Required: []string{"device"}},
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},
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{
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Name: "call_agent_mcp", Description: "通过 Hub 调度指定 Agent 上已挂载的 MCP 工具",
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InputSchema: InputSchema{Type: "object", Properties: map[string]PropertyDef{"device": {Type: "string", Description: "目标 Agent 节点名称"}, "server": {Type: "string", Description: "MCP 服务 ID"}, "tool": {Type: "string", Description: "MCP 工具名称"}, "arguments": {Type: "object", Description: "MCP 工具参数 JSON 对象"}}, Required: []string{"device", "server", "tool"}},
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},
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}
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return JSONRPCResponse{
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JSONRPC: "2.0",
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ID: req.ID,
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Result: map[string]any{"tools": tools},
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}
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case "tools/call":
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var params CallToolParams
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if err := json.Unmarshal(req.Params, ¶ms); err != nil {
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return JSONRPCResponse{
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JSONRPC: "2.0",
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ID: req.ID,
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Error: &JSONRPCError{Code: -32602, Message: "invalid tool params"},
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}
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}
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clientIP := r.RemoteAddr
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res, isErr := s.callTool(ctx, clientIP, params)
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resJSON, _ := json.MarshalIndent(res, "", " ")
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return JSONRPCResponse{
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JSONRPC: "2.0",
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ID: req.ID,
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Result: CallToolResult{
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Content: []TextContent{
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{Type: "text", Text: string(resJSON)},
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},
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IsError: isErr,
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},
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}
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default:
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return JSONRPCResponse{
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JSONRPC: "2.0",
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ID: req.ID,
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Error: &JSONRPCError{Code: -32601, Message: fmt.Sprintf("method not found: %s", req.Method)},
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}
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}
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}
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func (s *Server) callTool(ctx context.Context, clientIP string, params CallToolParams) (any, bool) {
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switch params.Name {
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case "list_devices":
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devs, err := s.Backend.ListDevices(ctx)
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if err != nil {
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return map[string]string{"error": err.Error()}, true
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}
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return devs, false
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case "exec_command":
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var args struct {
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Device string `json:"device"`
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Command string `json:"command"`
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Workdir string `json:"workdir"`
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Timeout int `json:"timeout"`
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}
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_ = json.Unmarshal(params.Arguments, &args)
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if args.Command == "" {
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return map[string]string{"error": "command is required"}, true
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}
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res, err := s.Backend.ExecCommand(ctx, clientIP, args.Device, args.Command, args.Workdir, args.Timeout)
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if err != nil {
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return map[string]string{"error": err.Error()}, true
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}
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return res, false
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case "read_file":
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var args struct {
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Device string `json:"device"`
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Path string `json:"path"`
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Offset int64 `json:"offset"`
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Limit int64 `json:"limit"`
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}
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_ = json.Unmarshal(params.Arguments, &args)
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if args.Path == "" {
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return map[string]string{"error": "path is required"}, true
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}
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res, err := s.Backend.ReadFile(ctx, clientIP, args.Device, args.Path, args.Offset, args.Limit)
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if err != nil {
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return map[string]string{"error": err.Error()}, true
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}
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return res, false
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case "read_multiple_files":
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var a struct {
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Device string `json:"device"`
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Paths []string `json:"paths"`
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Limit int64 `json:"limit"`
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}
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_ = json.Unmarshal(params.Arguments, &a)
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b, ok := s.Backend.(ExtendedBackend)
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if !ok {
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return map[string]string{"error": "extended tools unavailable"}, true
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}
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res, err := b.ReadMultipleFiles(ctx, clientIP, a.Device, a.Paths, a.Limit)
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if err != nil {
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return map[string]string{"error": err.Error()}, true
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}
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return res, false
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case "create_directory":
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var a struct{ Device, Path string }
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_ = json.Unmarshal(params.Arguments, &a)
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b, ok := s.Backend.(ExtendedBackend)
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if !ok {
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return map[string]string{"error": "extended tools unavailable"}, true
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}
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res, err := b.CreateDirectory(ctx, clientIP, a.Device, a.Path)
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if err != nil {
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return map[string]string{"error": err.Error()}, true
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}
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return res, false
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case "move_file":
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var a struct{ Device, Source, Destination string }
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_ = json.Unmarshal(params.Arguments, &a)
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b, ok := s.Backend.(ExtendedBackend)
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if !ok {
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return map[string]string{"error": "extended tools unavailable"}, true
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}
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res, err := b.MoveFile(ctx, clientIP, a.Device, a.Source, a.Destination)
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if err != nil {
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return map[string]string{"error": err.Error()}, true
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}
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return res, false
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case "list_processes":
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var a struct {
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Device string `json:"device"`
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}
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_ = json.Unmarshal(params.Arguments, &a)
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b, ok := s.Backend.(ExtendedBackend)
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if !ok {
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return map[string]string{"error": "extended tools unavailable"}, true
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}
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res, err := b.ListProcesses(ctx, clientIP, a.Device)
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if err != nil {
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return map[string]string{"error": err.Error()}, true
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}
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return res, false
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case "edit_block":
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var args struct{ Device, Path, OldText, NewText string }
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_ = json.Unmarshal(params.Arguments, &args)
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if args.Path == "" || args.OldText == "" {
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return map[string]string{"error": "path and old_text are required"}, true
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}
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res, err := s.Backend.EditBlock(ctx, clientIP, args.Device, args.Path, args.OldText, args.NewText)
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if err != nil {
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return map[string]string{"error": err.Error()}, true
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}
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return res, false
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case "write_file":
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var args struct {
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Device string `json:"device"`
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Path string `json:"path"`
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Content string `json:"content"`
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}
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_ = json.Unmarshal(params.Arguments, &args)
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if args.Path == "" {
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return map[string]string{"error": "path is required"}, true
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}
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res, err := s.Backend.WriteFile(ctx, clientIP, args.Device, args.Path, args.Content)
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if err != nil {
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return map[string]string{"error": err.Error()}, true
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}
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||
return res, false
|
||
|
||
case "list_agent_mcp":
|
||
var args struct {
|
||
Device string `json:"device"`
|
||
}
|
||
_ = json.Unmarshal(params.Arguments, &args)
|
||
b, ok := s.Backend.(AgentMCPBackend)
|
||
if !ok {
|
||
return map[string]string{"error": "agent MCP unavailable"}, true
|
||
}
|
||
if gate, ok := s.Backend.(SecurityGate); ok {
|
||
if err := gate.AuthorizeMCP(args.Device, "read", clientIP); err != nil {
|
||
return map[string]string{"error": err.Error()}, true
|
||
}
|
||
}
|
||
res, err := b.ListAgentMCP(ctx, args.Device)
|
||
if err != nil {
|
||
return map[string]string{"error": err.Error()}, true
|
||
}
|
||
return res, false
|
||
|
||
case "call_agent_mcp":
|
||
var args struct {
|
||
Device string `json:"device"`
|
||
Server string `json:"server"`
|
||
Tool string `json:"tool"`
|
||
Arguments json.RawMessage `json:"arguments"`
|
||
}
|
||
_ = json.Unmarshal(params.Arguments, &args)
|
||
b, ok := s.Backend.(AgentMCPBackend)
|
||
if !ok {
|
||
return map[string]string{"error": "agent MCP unavailable"}, true
|
||
}
|
||
var av any
|
||
if len(args.Arguments) > 0 {
|
||
_ = json.Unmarshal(args.Arguments, &av)
|
||
}
|
||
if gate, ok := s.Backend.(SecurityGate); ok {
|
||
if err := gate.AuthorizeMCP(args.Device, "mcp", clientIP); err != nil {
|
||
return map[string]string{"error": err.Error()}, true
|
||
}
|
||
}
|
||
res, err := b.CallAgentMCP(ctx, clientIP, args.Device, args.Server, args.Tool, av)
|
||
if err != nil {
|
||
return map[string]string{"error": err.Error()}, true
|
||
}
|
||
return res, false
|
||
|
||
default:
|
||
return map[string]string{"error": "unknown tool: " + params.Name}, true
|
||
}
|
||
}
|
||
|
||
func (s *Server) HandleDirectRequest(ctx context.Context, req JSONRPCRequest) JSONRPCResponse {
|
||
return s.handleRequest(ctx, &http.Request{RemoteAddr: "stdio"}, req)
|
||
}
|