/
encrypted_token.go
109 lines (84 loc) · 2.16 KB
/
encrypted_token.go
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package parser
import (
"bytes"
"fmt"
"unicode"
"github.com/timtadh/lexmachine"
"github.com/timtadh/lexmachine/machines"
"github.com/UiP9AV6Y/encval/pkg/crypto"
)
type EncryptedToken struct {
column, line int
value crypto.Data
provider string
}
func EncryptedTokenFactory() lexmachine.Action {
return func(s *lexmachine.Scanner, m *machines.Match) (interface{}, error) {
return ParseEncryptedToken(m.Bytes, m.StartLine, m.StartColumn)
}
}
func ParseEncryptedToken(match []byte, line, column int) (*EncryptedToken, error) {
var provider string
var value []byte
if len(match) < 5 || match[3] != '[' { // ENC[]
return nil, ErrMalformedToken
}
haystack := match[4 : len(match)-1] // ENC[ ]
params := bytes.Split(haystack, []byte(","))
if len(params) > 2 {
return nil, ErrMalformedToken
}
if len(params) > 1 {
value = ParseEncryptedValue(params[1])
}
if len(params) > 0 {
provider = string(bytes.TrimSpace(params[0]))
}
result := NewEncryptedToken(crypto.Data(value), provider, line, column)
return result, nil
}
func ParseEncryptedValue(v []byte) crypto.Data {
result := make(crypto.Data, 0, len(v))
for i := 0; i < len(v); i++ {
c := v[i]
if !unicode.IsSpace(rune(c)) {
result = append(result, c)
}
}
return result
}
func NewEncryptedToken(value crypto.Data, provider string, line, column int) *EncryptedToken {
result := &EncryptedToken{
line: line,
column: column,
value: value,
provider: provider,
}
return result
}
func (t *EncryptedToken) Provider() string {
return t.provider
}
func (t *EncryptedToken) Value() crypto.Data {
return t.value.Copy()
}
func (t *EncryptedToken) String() string {
return fmt.Sprintf("ENC[%s,%s]", t.provider, t.value)
}
func (t *EncryptedToken) Convert(e crypto.Encrypters) (Token, error) {
enc, ok := e.Get(t.provider)
if !ok {
return nil, fmt.Errorf("No such encryption provider %q available", t.provider)
}
value, err := enc.Decrypt(t.value)
if err != nil {
return nil, err
}
return NewDecryptedToken(value, t.provider, t.line, t.column), nil
}
func (t *EncryptedToken) Column() int {
return t.column
}
func (t *EncryptedToken) Line() int {
return t.line
}