refactor and error handling

.gitignore

@@ -1,3 +1,4 @@
 .DS_Store
 images/*
-out/
+out/
+stego

images/.gitignore

@@ -0,0 +1,2 @@
+*
+!.gitignore

internal/cli/decrypt.go

@@ -0,0 +1,111 @@
+package cli
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+
+	"github.com/enrichman/stegosecrets/internal/decrypt"
+	"github.com/enrichman/stegosecrets/pkg/file"
+	"github.com/spf13/cobra"
+)
+
+var (
+	encryptedFile string
+	masterKeyFile string
+	keyFiles      []string
+	imageFiles    []string
+)
+
+func newDecryptCmd() *cobra.Command {
+	decryptCmd := &cobra.Command{
+		Use:   "decrypt",
+		Short: "decrypt",
+		Long:  ``,
+		RunE:  runDecryptCmd,
+	}
+
+	decryptCmd.Flags().StringVarP(&encryptedFile, "file", "f", "", "file")
+	decryptCmd.Flags().StringVar(&masterKeyFile, "master-key", "", "masterkey")
+	decryptCmd.Flags().StringArrayVar(&keyFiles, "key", []string{}, "keys")
+	decryptCmd.Flags().StringArrayVar(&imageFiles, "img", []string{}, "images")
+
+	return decryptCmd
+}
+
+func runDecryptCmd(cmd *cobra.Command, args []string) error {
+
+	decrypterOpts := []decrypt.OptFunc{}
+
+	if masterKeyFile != "" {
+		decrypterOpts = append(decrypterOpts, decrypt.WithMasterKeyFile(masterKeyFile))
+	}
+
+	for _, filename := range keyFiles {
+		decrypterOpts = append(decrypterOpts, decrypt.WithPartialKeyFile(filename))
+	}
+
+	for _, filename := range imageFiles {
+		decrypterOpts = append(decrypterOpts, decrypt.WithPartialKeyImageFile(filename))
+	}
+
+	decrypter, err := decrypt.NewDecrypter(decrypterOpts...)
+	if err != nil {
+		return err
+	}
+
+	// _, err := sss.Combine(parts)
+	// if err != nil {
+	// 	panic(err)
+	// }
+
+	var encryptedBytes []byte
+	if encryptedFile != "" {
+		encryptedBytes, err = getEncryptedInputFromFile(encryptedFile)
+		if err != nil {
+			return err
+		}
+	} else {
+		encryptedBytes, err = getEncryptedInputFromStdin()
+		if err != nil {
+			return err
+		}
+	}
+
+	return decrypter.Decrypt(encryptedBytes)
+}
+
+func getEncryptedInputFromFile(filename string) ([]byte, error) {
+	return file.ReadFile(filename)
+}
+
+func getEncryptedInputFromStdin() ([]byte, error) {
+	fi, err := os.Stdin.Stat()
+	if err != nil {
+		return nil, err
+	}
+
+	if fi.Mode()&os.ModeNamedPipe == 0 {
+		// TODO ?
+		os.Exit(1)
+	}
+
+	input := []byte{}
+	scanner := bufio.NewScanner(os.Stdin)
+	for {
+		fmt.Println("scanning")
+		scanner.Scan()
+		// Holds the string that was scanned
+		text := scanner.Bytes()
+		if len(text) == 0 {
+			break
+		}
+		input = append(input, text...)
+	}
+
+	if scanner.Err() != nil {
+		fmt.Println("Error: ", scanner.Err())
+	}
+
+	return input, nil
+}

internal/cli/encrypt.go

@@ -0,0 +1,39 @@
+package cli
+
+import (
+	"bufio"
+	"bytes"
+	"fmt"
+	"os"
+
+	"github.com/enrichman/stegosecrets/internal/encrypt"
+	"github.com/spf13/cobra"
+)
+
+func newEncryptCmd() *cobra.Command {
+	return &cobra.Command{
+		Use:   "encrypt",
+		Short: "encrypt",
+		Long:  ``,
+		RunE:  runEncryptCmd,
+	}
+}
+
+func runEncryptCmd(cmd *cobra.Command, args []string) error {
+	fi, err := os.Stdin.Stat()
+	if err != nil {
+		return err
+	}
+
+	// no pipe
+	if fi.Mode()&os.ModeNamedPipe == 0 {
+		fmt.Print("Enter message: ")
+	}
+
+	message, _ := bufio.NewReader(os.Stdin).ReadBytes('\n')
+
+	encrypter := encrypt.Encrypter{Parts: 2, Threshold: 2}
+	encrypter.Encrypt(bytes.NewReader(message))
+
+	return nil
+}