package photosapi

import (
	"crypto/sha256"
	"encoding/base64"
	"hash"
)

type Checksum struct {
	s hash.Hash
}

func NewChecksum() *Checksum {
	return &Checksum{sha256.New()}
}

func (c *Checksum) Write(b []byte) (int, error) {
	return c.s.Write(b)
}

func (c *Checksum) String() string {
	return base64.URLEncoding.EncodeToString(c.s.Sum(nil))
}

func (c *Checksum) Match(sha string) bool {
	return c.String() == sha
}