feat: load packet logs from configured source

internal/mcpserver/server.go

@@ -1,6 +1,10 @@
 package mcpserver
 
 import (
+	"fmt"
+	"os"
+	"strings"
+
 	"github.com/modelcontextprotocol/go-sdk/mcp"
 
 	"isphere-ai-bridge/internal/helperclient"
@@ -9,18 +13,36 @@ import (
 )
 
 const (
-	ServerName    = "isphere-ai-bridge"
-	ServerTitle   = "iSphere AI Bridge"
-	ServerVersion = "0.1.0"
+	ServerName          = "isphere-ai-bridge"
+	ServerTitle         = "iSphere AI Bridge"
+	ServerVersion       = "0.1.0"
+	EnvPacketLogFileKey = "ISPHERE_PACKET_LOG_FILE"
 )
 
 func NewServer() *mcp.Server {
+	return NewServerWithReceiveSource(isphere.EncryptedPacketLogSource{})
+}
+
+func NewServerFromEnv() (*mcp.Server, error) {
+	var source tools.ReceiveMessagesSource = isphere.EncryptedPacketLogSource{}
+	packetLogFile := strings.TrimSpace(os.Getenv(EnvPacketLogFileKey))
+	if packetLogFile != "" {
+		loaded, err := isphere.LoadEncryptedPacketLogSourceFromFile(packetLogFile)
+		if err != nil {
+			return nil, fmt.Errorf("configure %s: %w", EnvPacketLogFileKey, err)
+		}
+		source = loaded
+	}
+	return NewServerWithReceiveSource(source), nil
+}
+
+func NewServerWithReceiveSource(source tools.ReceiveMessagesSource) *mcp.Server {
 	server := mcp.NewServer(&mcp.Implementation{
 		Name:    ServerName,
 		Title:   ServerTitle,
 		Version: ServerVersion,
 	}, nil)
 	tools.RegisterWinHelperTools(server, helperclient.Client{})
-	tools.RegisterISphereReadTools(server, isphere.EncryptedPacketLogSource{})
+	tools.RegisterISphereReadTools(server, source)
 	return server
 }