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package commands
import (
"context"
"encoding/gob"
"log/slog"
"os"
"path/filepath"
"github.com/nerdsec/goaes/internal"
"github.com/urfave/cli/v3"
)
func Decrypt(ctx context.Context, cmd *cli.Command) error {
source := cmd.StringArg("source")
destination := cmd.StringArg("destination")
if source == "" {
return cli.Exit("missing source", invalidArgsExit)
}
if destination == "" {
return cli.Exit("missing destination", invalidArgsExit)
}
source = filepath.Clean(source)
file, err := os.Open(source)
if err != nil {
return err
}
defer func() {
err := file.Close()
if err != nil {
slog.Error("failed to close file", "error", err)
}
}()
enc := gob.NewDecoder(file)
var encryptedPayload internal.EncryptedDataPayload
err = enc.Decode(&encryptedPayload)
if err != nil {
return err
}
passphrase := os.Getenv(PassphraseEnvVar)
plaintext, err := internal.Decrypt(passphrase, encryptedPayload.DEK, encryptedPayload.Payload, encryptedPayload.Salt)
if err != nil {
return err
}
destination = filepath.Clean(destination)
err = os.WriteFile(destination, plaintext, fileMode)
if err != nil {
return err
}
return nil
}
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