Apache Camel 检查目录读取权限（AWS 环境）

Question

我有一个用于验证 FTP 目录的 API，如下所示：

public boolean validateDirectory(FtpLocation ftpLocation) throws CustomException{
    FTPClient client = new FTPClient();
    try {
        client.connect(ftpLocation.getSystem(), Integer.parseInt(ftpLocation.getPort()));
        client.login(ftpLocation.getUser(), ftpLocation.getPassword());
        client.changeWorkingDirectory(ftpLocation.getDirPath());
        int returnCode = client.getReplyCode();
        if (returnCode == 550) {
            LOG.error("Directory ["+ ftpLocation.getDirPath() + "] does not exist");
            return false;
        }           
        File dir = new File(ftpLocation.getDirPath());
        if(dir!=null){
            if (!dir.canRead()) {
                LOG.error("Directory ["+ ftpLocation.getDirPath() + "] does not have read permission");
                return false;
            }
        }
        return true;
    } catch (NumberFormatException | IOException e) {
        LOG.error("Failed to validate Source Directory Path [" + ftpLocation.getDirPath() + "]", e);
        throw new CustomException("Failed to validate Source Directory Path [" + ftpLocation.getDirPath() + "]", e);
    } finally {
        try {
            client.disconnect();
        } catch (IOException e) {
            LOG.warn("Error occured while disconnecting FTPClient", e);
        }
    }   
}

我的 FTP 根目录是 /（绝对路径 /home/soumya）

我想从 /source 路由文件（绝对路径 /home/soumya/source）

我在测试我的 API 时发现了以下行为：

1. 如果 source 具有权限 rwxrwxr-x 则抛出验证消息（实际上期望文件路由成功）。
2. 如果 source 具有权限 -wx-wx--x 则验证成功。
3. 如果 source 不存在，则验证成功。
4. 如果 source 不是目录（source 是文件）则验证成功。

以上四种场景的日志如下：

07:41:59.799 [pool-2-thread-1] ERROR c.n.d.m.b.f.Validator - Directory [/source] does not have read permission

07:42:48.801 [pool-2-thread-1] ERROR c.n.d.m.b.f.Validator - Directory [/source] does not have read permission

07:43:27.093 [pool-2-thread-1] ERROR c.n.d.m.b.f.Validator - Directory [/source] does not exist

07:44:00.215 [pool-2-thread-1] ERROR c.n.d.m.b.f.Validator - Directory [/source] does not exist

问题：

1. 有没有其他方法可以解决1的问题，成功路由source的文件？
2. 如何验证目录以检查读取权限？

注意：骆驼版本是2.12.1

Answer 1

我找到了解决问题的方法，如下：

public void validateDirectory(FtpLocation ftpLocation) throws CustomException {
    FTPClient client = new FTPClient();
    try {
        client.connect(ftpLocation.getSystem(), Integer.parseInt(ftpLocation.getPort()));
        client.login(ftpLocation.getUser(), ftpLocation.getPassword());
        client.enterLocalPassiveMode();
        client.changeWorkingDirectory(ftpLocation.getDirPath());
        int returnCode = client.getReplyCode();
        LOG.debug("FTP return code: "+ returnCode);
        if (returnCode == 550) {
            LOG.error("Directory ["+ ftpLocation.getDirPath() + "] does not exist");
            throw new CustomException("Directory ["+ ftpLocation.getDirPath() + "] does not exist");
        }
        String targetDir = client.printWorkingDirectory();
        client.cdup();
        targetDir = StringUtils.substring(targetDir, StringUtils.lastIndexOf(targetDir, File.separator) + 1);
        FTPFile ftpFiles[] = client.listFiles();
        for(FTPFile ftpFile : ftpFiles){
            if(StringUtils.equals(ftpFile.getName(), targetDir) && !ftpFile.hasPermission(FTPFile.USER_ACCESS, FTPFile.READ_PERMISSION)){
                LOG.error("No read permission for directory [" + ftpLocation.getDirPath() + "]");
                throw new CustomException("No read permission for directory [" + ftpLocation.getDirPath() + "]");
            }
        }
    } catch (NumberFormatException | IOException e) {
        LOG.error("Failed to validate Source Directory Path [" + ftpLocation.getDirPath() + "]", e);
        throw new CustomException("Failed to validate Source Directory Path [" + ftpLocation.getDirPath() + "]", e);
    } finally {
        try {
            client.disconnect();
        } catch (IOException e) {
            LOG.warn("Error occured while disconnecting FTPClient", e);
        }
    }   
}

但是，如果您有更好的解决方案，请发布。