2026-03-05 17:44:19 +08:00
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package shell
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2026-02-21 23:01:39 +08:00
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import (
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"context"
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"fmt"
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"os/exec"
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"path/filepath"
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"runtime"
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2026-02-21 23:01:39 +08:00
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"strings"
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"time"
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"laodingbot/internal/logger"
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)
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type Tool struct {
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// allowedCommands 允许执行的shell命令集合,作为白名单使用。
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allowedCommands map[string]struct{}
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// workDir shell命令执行的工作目录。
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workDir string
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// timeout 单个shell命令执行的超时时间,防止长时间阻塞。
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timeout time.Duration
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// maxOutputChars 最大输出字符数限制,避免输出过长导致内存或上下文溢出。
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maxOutputChars int
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// log 用于记录shell工具操作和执行详情的日志实例。
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log *logger.Logger
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}
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// New 创建一个新的 shell 工具实例。
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// allowed: 允许被执行的命令白名单(例如 "ls", "echo" 等)。
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// workDir: 命令执行的基础工作目录。
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// timeout: 命令执行的最大超时时间。
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// maxOutputChars: 命令执行结果允许返回的最大字符数。
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// log: 日志记录器。
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// 返回初始化的 Tool 实例指针。
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func New(allowed []string, workDir string, timeout time.Duration, maxOutputChars int, log *logger.Logger) *Tool {
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set := make(map[string]struct{}, len(allowed))
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for _, c := range allowed {
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cmd := strings.TrimSpace(c)
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if cmd != "" {
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set[cmd] = struct{}{}
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}
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}
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absDir, err := filepath.Abs(workDir)
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if err != nil {
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absDir = workDir
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}
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if timeout <= 0 {
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timeout = 15 * time.Second
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}
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if maxOutputChars <= 0 {
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maxOutputChars = 4000
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}
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if log != nil {
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log.Infof("shell tool initialized allowed_commands=%d work_dir=%s timeout=%s max_output_chars=%d", len(set), absDir, timeout, maxOutputChars)
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}
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return &Tool{allowedCommands: set, workDir: absDir, timeout: timeout, maxOutputChars: maxOutputChars, log: log}
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}
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// Name 返回此工具的名称。
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func (t *Tool) Name() string { return "shell" }
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// Description 返回此工具的功能描述。
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func (t *Tool) Description() string {
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return "Execute shell commands (Windows uses cmd /C; for current time prefer: echo %DATE% %TIME%)"
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}
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// Call 执行指定的底层 shell 命令。
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// ctx: 用于控制执行过程的上下文。
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// input: 包含要执行的完整命令字符串。
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// 当前临时策略:允许执行任意命令(不做 allows 白名单拦截),并在执行完毕后返回输出。
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func (t *Tool) Call(ctx context.Context, input string) (string, error) {
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trimmed := strings.TrimSpace(input)
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if trimmed == "" {
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if t.log != nil {
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t.log.Warnf("shell tool rejected empty command")
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}
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return "", fmt.Errorf("empty command")
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}
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if runtime.GOOS == "windows" {
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trimmed = normalizeWindowsCommand(trimmed)
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}
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parts := strings.Fields(trimmed)
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base := parts[0]
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if t.log != nil {
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t.log.Infof("shell command start command=%s args=%d full_command=%q", base, len(parts)-1, trimmed)
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}
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runCtx, cancel := context.WithTimeout(ctx, t.timeout)
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defer cancel()
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var cmd *exec.Cmd
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if runtime.GOOS == "windows" {
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// Windows 下使用 cmd /C 执行,兼容 date、dir 等内建命令。
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cmd = exec.CommandContext(runCtx, "cmd", "/C", trimmed)
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} else {
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cmd = exec.CommandContext(runCtx, base, parts[1:]...)
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}
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cmd.Dir = t.workDir
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out, err := cmd.CombinedOutput()
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outText := string(out)
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if len(outText) > t.maxOutputChars {
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outText = outText[:t.maxOutputChars]
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}
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if err != nil {
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if t.log != nil {
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t.log.Errorf("shell command failed command=%s full_command=%q err=%v output_bytes=%d output=%q", base, trimmed, err, len(out), outText)
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}
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return outText, err
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}
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if t.log != nil {
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t.log.Infof("shell command success command=%s full_command=%q output_bytes=%d output=%q", base, trimmed, len(out), outText)
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}
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return outText, nil
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}
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func normalizeWindowsCommand(command string) string {
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cmd := strings.TrimSpace(strings.ToLower(command))
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switch cmd {
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case "date", "date /t":
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return "echo %DATE% %TIME%"
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case "time", "time /t":
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return "echo %DATE% %TIME%"
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default:
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return command
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}
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}
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