feat: add workspace path validation for sending attachments

pkg/agent/instance.go

@@ -22,6 +22,7 @@ type AgentInstance struct {
 	Workspace           string
 	MaxIterations       int
 	ContextWindow       int
+	RestrictToWorkspace bool
 	Provider            providers.LLMProvider
 	Sessions            *session.SessionManager
 	ContextBuilder      *ContextBuilder
@@ -91,6 +92,7 @@ func NewAgentInstance(
 		Workspace:           workspace,
 		MaxIterations:       maxIter,
 		ContextWindow:       defaults.MaxTokens,
+		RestrictToWorkspace: restrict,
 		Provider:            provider,
 		Sessions:            sessionsManager,
 		ContextBuilder:      contextBuilder,

pkg/agent/loop.go

@@ -106,7 +106,7 @@ func registerSharedTools(cfg *config.Config, msgBus *bus.MessageBus, registry *A
 		agent.Tools.Register(tools.NewSPITool())
 
 		// Message tool
-		messageTool := tools.NewMessageTool()
+		messageTool := tools.NewMessageTool(agent.Workspace, agent.RestrictToWorkspace)
 		messageTool.SetSendCallback(func(channel, chatID, content string, attachments []bus.Attachment) error {
 			msgBus.PublishOutbound(bus.OutboundMessage{
 				Channel:     channel,

pkg/tools/message.go

@@ -10,14 +10,20 @@ import (
 type SendCallback func(channel, chatID, content string, attachments []bus.Attachment) error
 
 type MessageTool struct {
+	allowedDir     string
+	restrict       bool
 	sendCallback   SendCallback
 	defaultChannel string
 	defaultChatID  string
 	sentInRound    bool // Tracks whether a message was sent in the current processing round
 }
 
-func NewMessageTool() *MessageTool {
-	return &MessageTool{}
+// NewMessageTool creates a new MessageTool with optional uploading directory restriction.
+func NewMessageTool(allowedDir string, restrict bool) *MessageTool {
+	return &MessageTool{
+		allowedDir: allowedDir,
+		restrict:   restrict,
+	}
 }
 
 func (t *MessageTool) Name() string {
@@ -110,18 +116,28 @@ func (t *MessageTool) Execute(ctx context.Context, args map[string]interface{})
 	var attachments []bus.Attachment
 	if attachmentsRaw, ok := args["attachments"].([]interface{}); ok {
 		for _, attachRaw := range attachmentsRaw {
-			if attachMap, ok := attachRaw.(map[string]interface{}); ok {
+			attachMap, ok := attachRaw.(map[string]interface{})
+			if !ok {
+				continue // Skip invalid attachment entries
+			}
+
 			path, pathOk := attachMap["path"].(string)
 			filename, filenameOk := attachMap["filename"].(string)
-				if pathOk && filenameOk {
+			if !pathOk || !filenameOk {
+				continue // Skip invalid attachment entries
+			}
+
+			resolvedPath, err := validatePath(path, t.allowedDir, t.restrict)
+			if err != nil {
+				return ErrorResult(err.Error())
+			}
+
 			attachments = append(attachments, bus.Attachment{
-						Path:     path,
+				Path:     resolvedPath,
 				Filename: filename,
 			})
 		}
 	}
-		}
-	}
 
 	if err := t.sendCallback(channel, chatID, content, attachments); err != nil {
 		return &ToolResult{