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package s3crypto
import (
"io"
)
// Cipher interface allows for either encryption and decryption of an object
type Cipher interface {
Encrypter
Decrypter
}
// Encrypter interface with only the encrypt method
type Encrypter interface {
Encrypt(io.Reader) io.Reader
}
// Decrypter interface with only the decrypt method
type Decrypter interface {
Decrypt(io.Reader) io.Reader
}
// CryptoReadCloser handles closing of the body and allowing reads from the decrypted
// content.
type CryptoReadCloser struct {
Body io.ReadCloser
Decrypter io.Reader
isClosed bool
}
// Close lets the CryptoReadCloser satisfy io.ReadCloser interface
func (rc *CryptoReadCloser) Close() error {
rc.isClosed = true
return rc.Body.Close()
}
// Read lets the CryptoReadCloser satisfy io.ReadCloser interface
func (rc *CryptoReadCloser) Read(b []byte) (int, error) {
if rc.isClosed {
return 0, io.EOF
}
return rc.Decrypter.Read(b)
}
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