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Copy pathhelpers.go
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executable file
·100 lines (80 loc) · 2.09 KB
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package ghostly
import (
"crypto/aes"
"crypto/cipher"
"crypto/rand"
"encoding/base64"
"io"
"os"
)
const (
randomString = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0987654321_+"
)
// RandomString generates a random string length n from values in the const randomString
func (g *Ghostly) RandomString(n int) string {
s, r := make([]rune, n), []rune(randomString)
for i := range s {
p, _ := rand.Prime(rand.Reader, len(r))
x, y := p.Uint64(), uint64(len(r))
s[i] = r[x%y]
}
return string(s)
}
// CreateDirIfNotExist creates a new directory if it does not exist
func (g *Ghostly) CreateDirIfNotExist(path string) error {
const mode = 0755
if _, err := os.Stat(path); os.IsNotExist(err) {
err := os.Mkdir(path, mode)
if err != nil {
return err
}
}
return nil
}
// CreateFileIfNotExists creates a new file at path if it does not exist
func (g *Ghostly) CreateFileIfNotExists(path string) error {
var _, err = os.Stat(path)
if os.IsNotExist(err) {
var file, err = os.Create(path)
if err != nil {
return err
}
defer func(file *os.File) {
_ = file.Close()
}(file)
}
return nil
}
type Encryption struct {
Key []byte
}
func (e *Encryption) Encrypt(text string) (string, error) {
plaintext := []byte(text)
block, err := aes.NewCipher(e.Key)
if err != nil {
return "", err
}
ciphertext := make([]byte, aes.BlockSize+len(plaintext))
iv := ciphertext[:aes.BlockSize]
if _, err := io.ReadFull(rand.Reader, iv); err != nil {
return "", err
}
stream := cipher.NewCFBEncrypter(block, iv)
stream.XORKeyStream(ciphertext[aes.BlockSize:], plaintext)
return base64.URLEncoding.EncodeToString(ciphertext), nil
}
func (e *Encryption) Decrypt(cryptoText string) (string, error) {
ciphertext, _ := base64.URLEncoding.DecodeString(cryptoText)
block, err := aes.NewCipher(e.Key)
if err != nil {
return "", err
}
if len(ciphertext) < aes.BlockSize {
return "", err
}
iv := ciphertext[:aes.BlockSize]
ciphertext = ciphertext[aes.BlockSize:]
stream := cipher.NewCFBDecrypter(block, iv)
stream.XORKeyStream(ciphertext, ciphertext)
return string(ciphertext), nil
}