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ots/cmd/ots-cli/cmd_fetch.go

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package main
import (
"errors"
"fmt"
"io/fs"
"os"
"path"
"strings"
"github.com/Luzifer/ots/pkg/client"
"github.com/sirupsen/logrus"
"github.com/spf13/cobra"
)
const storeFileMode = 0o600 // We assume the attached file to be a secret
var fetchCmd = &cobra.Command{
Use: "fetch <url>",
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Short: "Retrieves a secret from the instance by its URL",
Long: "",
Args: cobra.ExactArgs(1),
RunE: fetchRunE,
}
func init() {
fetchCmd.Flags().String("file-dir", ".", "Where to put files attached to the secret")
rootCmd.AddCommand(fetchCmd)
}
func checkDirWritable(dir string) error {
tmpFile := path.Join(dir, ".ots-cli.tmp")
if err := os.WriteFile(tmpFile, []byte(""), storeFileMode); err != nil {
return fmt.Errorf("writing tmp-file: %w", err)
}
defer os.Remove(tmpFile) //nolint:errcheck // We don't really care
return nil
}
func fetchRunE(cmd *cobra.Command, args []string) error {
cmd.SilenceUsage = true
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fileDir, err := cmd.Flags().GetString("file-dir")
if err != nil {
return fmt.Errorf("getting file-dir parameter: %w", err)
}
// First lets check whether we potentially can write files
if err := checkDirWritable(fileDir); err != nil {
return fmt.Errorf("checking for directory write: %w", err)
}
logrus.Info("fetching secret...")
secret, err := client.Fetch(args[0])
if err != nil {
return fmt.Errorf("fetching secret")
}
for _, f := range secret.Attachments {
logrus.WithField("file", f.Name).Info("storing file...")
if err = storeAttachment(fileDir, f); err != nil {
return fmt.Errorf("saving file to disk: %w", err)
}
}
fmt.Println(secret.Secret) //nolint:forbidigo // Output intended for STDOUT
return nil
}
func storeAttachment(dir string, f client.SecretAttachment) error {
// First lets find a free file name to save the file as
var (
fileNameFragments = strings.SplitN(f.Name, ".", 2) //nolint:mnd
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i int
storeName = path.Join(dir, f.Name)
storeNameTpl string
)
if len(fileNameFragments) == 1 {
storeNameTpl = fmt.Sprintf("%s (%%d)", fileNameFragments[0])
} else {
storeNameTpl = fmt.Sprintf("%s (%%d).%s", fileNameFragments[0], fileNameFragments[1])
}
for _, err := os.Stat(storeName); !errors.Is(err, fs.ErrNotExist); _, err = os.Stat(storeName) {
i++
storeName = fmt.Sprintf(storeNameTpl, i)
}
// So we finally found a filename we can use
if err := os.WriteFile(storeName, f.Content, storeFileMode); err != nil {
return fmt.Errorf("writing file: %w", err)
}
return nil
}