Function MakeAttachmentKey

db/attachment.go:449–454

MakeAttachmentKey returns the unique for attachment storage and retrieval.

(version int, docID, digest string)

// MakeAttachmentKey returns the unique for attachment storage and retrieval.
func MakeAttachmentKey(version int, docID, digest string) string {
	if version == AttVersion2 {
		return base.Att2Prefix + sha256Digest([]byte(docID)) + ":" + digest
	}
	return base.AttPrefix + digest
}

// sha256Digest returns sha256 digest of the input bytes encoded
// by using the standard base64 encoding, as defined in RFC 4648.