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authenticator.go
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/
authenticator.go
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package authenticator
import (
"crypto/subtle"
"errors"
"strings"
"github.com/benchkram/errz"
"github.com/labstack/echo/v4"
)
type Authenticator struct {
apiKey []byte
}
func New(apiKey []byte) *Authenticator {
return &Authenticator{
apiKey: apiKey,
}
}
func (a *Authenticator) Authenticate(ctx echo.Context) (err error) {
defer errz.Recover(&err)
token, err := a.extractTokenFromRequest(ctx)
errz.Fatal(err)
return a.extractUserFromToken(token)
}
func (a *Authenticator) extractUserFromToken(token string) error {
if subtle.ConstantTimeCompare([]byte(token), a.apiKey) != 1 {
return errors.New("invalid token")
}
return nil
}
func (a *Authenticator) extractTokenFromRequest(ctx echo.Context) (token string, err error) {
defer errz.Recover(&err)
r := ctx.Request()
auth := r.Header.Get("Authorization")
if auth == "" {
errz.Fatal(errors.New("invalid auth token"))
}
parts := strings.Split(auth, "Bearer")
if len(parts) != 2 {
errz.Fatal(errors.New("invalid auth token"))
}
return strings.TrimSpace(parts[1]), nil
}