You've already forked agentic-coding-workflow
87 lines
2.7 KiB
Go
87 lines
2.7 KiB
Go
package handlers
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import (
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"context"
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"encoding/json"
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"errors"
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"io/fs"
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"os"
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"strings"
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"github.com/yan1h/agent-coding-workflow/internal/acp/pathsafe"
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)
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// FsReadHandler handles fs/read_text_file (spec §5.4).
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type FsReadHandler struct{}
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// NewFsReadHandler constructs an FsReadHandler.
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func NewFsReadHandler() *FsReadHandler { return &FsReadHandler{} }
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// fsReadParams is the ACP-protocol input for fs/read_text_file.
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type fsReadParams struct {
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SessionID string `json:"sessionId"`
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Path string `json:"path"`
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Line *int `json:"line,omitempty"`
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Limit *int `json:"limit,omitempty"`
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}
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type fsReadResult struct {
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Content string `json:"content"`
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}
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// Handle reads a file inside sess.CwdPath, returning content (with optional
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// line/limit slicing). Returns FsError for path-escape or read failure.
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func (h *FsReadHandler) Handle(_ context.Context, sess SessionContext, paramsJSON json.RawMessage) FsResult {
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var p fsReadParams
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if err := json.Unmarshal(paramsJSON, &p); err != nil {
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return FsResult{Err: &FsError{Code: -32602, Message: "invalid params: " + err.Error()}}
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}
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abs, err := resolveSafePath(sess.CwdPath, p.Path)
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if err != nil {
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return FsResult{Err: &FsError{Code: -32001, Message: err.Error()}}
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}
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data, err := os.ReadFile(abs)
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if err != nil {
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if errors.Is(err, fs.ErrNotExist) {
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return FsResult{Err: &FsError{Code: -32603, Message: "file not found"}}
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}
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return FsResult{Err: &FsError{Code: -32603, Message: "read: " + err.Error()}}
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}
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content := string(data)
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if p.Line != nil || p.Limit != nil {
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content = sliceLines(content, p.Line, p.Limit)
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}
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out, _ := json.Marshal(fsReadResult{Content: content})
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return FsResult{OK: out}
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}
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// sliceLines returns lines[line:line+limit] joined by "\n".
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// line is 0-based; limit caps the line count.
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func sliceLines(s string, line, limit *int) string {
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lines := strings.Split(s, "\n")
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start := 0
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if line != nil && *line > 0 {
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start = *line
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}
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if start > len(lines) {
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start = len(lines)
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}
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end := len(lines)
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if limit != nil && *limit >= 0 {
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// overflow-safe：用剩余行数为上限做钳制，避免 start+*limit 在 *limit 很大
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// （如 math.MaxInt）时整数溢出为负，绕过下界判断后导致 lines[start:end] panic。
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remaining := len(lines) - start
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if *limit < remaining {
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end = start + *limit
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}
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}
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return strings.Join(lines[start:end], "\n")
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}
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// resolveSafePath 委托共享实现 pathsafe.ResolveSafePath。
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// handlers 子包不能 import internal/acp 主包（acp 依赖 handlers，会循环），
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// 故校验逻辑抽到 internal/acp/pathsafe 子包共用。
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func resolveSafePath(cwd, requested string) (string, error) {
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return pathsafe.ResolveSafePath(cwd, requested)
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}
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