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package bcrypt
import (
"fmt"
"github.com/go-crypt/crypt/algorithm"
)
// Opt describes the functional option pattern for the bcrypt.Hasher.
type Opt func(h *Hasher) (err error)
// WithVariant is used to configure the bcrypt.Variant of the resulting bcrypt.Digest.
// Default is bcrypt.VariantStandard.
func WithVariant(variant Variant) Opt {
return func(h *Hasher) (err error) {
switch variant {
case VariantNone, VariantStandard, VariantSHA256:
h.variant = variant
return nil
default:
return fmt.Errorf(algorithm.ErrFmtHasherValidation, AlgName, fmt.Errorf("%w: variant '%d' is invalid", algorithm.ErrParameterInvalid, variant))
}
}
}
// WithVariantName uses the variant name or identifier to configure the bcrypt.Variant of the resulting bcrypt.Digest.
// Default is bcrypt.VariantStandard.
func WithVariantName(identifier string) Opt {
return func(h *Hasher) (err error) {
if identifier == "" {
return nil
}
variant := NewVariant(identifier)
if variant == VariantNone {
return fmt.Errorf(algorithm.ErrFmtHasherValidation, AlgName, fmt.Errorf("%w: variant identifier '%s' is invalid", algorithm.ErrParameterInvalid, identifier))
}
h.variant = variant
return nil
}
}
// WithIterations sets the iterations parameter of the resulting bcrypt.Digest.
// Minimum is 10, Maximum is 31. Default is 12.
func WithIterations(iterations int) Opt {
return func(h *Hasher) (err error) {
if iterations < IterationsMin || iterations > IterationsMax {
return fmt.Errorf(algorithm.ErrFmtHasherValidation, AlgName, fmt.Errorf(algorithm.ErrFmtInvalidIntParameter, algorithm.ErrParameterInvalid, "iterations", IterationsMin, "", IterationsMax, iterations))
}
h.iterations = iterations
return nil
}
}
// WithCost is an alias for bcrypt.WithIterations.
func WithCost(iterations int) Opt {
return WithIterations(iterations)
}
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