audanye-sudo
d0ab1ff641
- Add stdin.go with ReadStdinIfPiped and ReadFileArg helpers - Support @file syntax for --json flag to read payload from file - Fall back to stdin pipe when no --json argument is provided
77 lines
2.4 KiB
Go
77 lines
2.4 KiB
Go
// Copyright 2026 Alibaba Group
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package cli
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import (
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"io"
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"os"
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"strings"
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apperrors "github.com/DingTalk-Real-AI/dingtalk-workspace-cli/internal/errors"
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)
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const (
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// maxStdinSize limits the amount of data read from stdin or @file
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// to prevent memory exhaustion from accidental large pipes.
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maxStdinSize = 10 * 1024 * 1024 // 10 MB
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)
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// ReadStdinIfPiped reads all data from stdin if it is a pipe (not a terminal).
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// Returns empty string if stdin is a terminal or has no data.
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func ReadStdinIfPiped() (string, error) {
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info, err := os.Stdin.Stat()
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if err != nil {
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return "", nil
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}
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// Check if stdin is a pipe (not a character device / terminal).
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if info.Mode()&os.ModeCharDevice != 0 {
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return "", nil
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}
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data, err := io.ReadAll(io.LimitReader(os.Stdin, maxStdinSize+1))
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if err != nil {
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return "", apperrors.NewValidation("failed to read stdin: " + err.Error())
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}
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if int64(len(data)) > maxStdinSize {
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return "", apperrors.NewValidation("stdin input exceeds 10 MB limit")
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}
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return string(data), nil
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}
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// ReadFileArg reads the contents of a file referenced by the @filename syntax.
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// Returns the original value unchanged if it does not start with "@".
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// Returns an error if the file cannot be read or exceeds the size limit.
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func ReadFileArg(value string) (string, bool, error) {
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if !strings.HasPrefix(value, "@") {
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return value, false, nil
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}
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path := value[1:]
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if path == "" {
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return "", false, apperrors.NewValidation("@file: filename must not be empty")
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}
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info, err := os.Stat(path)
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if err != nil {
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return "", false, apperrors.NewValidation("@file: " + err.Error())
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}
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if info.Size() > maxStdinSize {
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return "", false, apperrors.NewValidation("@file: file exceeds 10 MB limit")
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}
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data, err := os.ReadFile(path)
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if err != nil {
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return "", false, apperrors.NewValidation("@file: " + err.Error())
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}
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return string(data), true, nil
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}
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