75 lines
1.9 KiB
Go
75 lines
1.9 KiB
Go
package nkode
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import (
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"errors"
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"fmt"
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"go-nkode/core/model"
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"go-nkode/util"
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)
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// TODO: make generic
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type CustomerAttributes struct {
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AttrVals []uint64
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SetVals []uint64
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KeypadSize model.KeypadSize
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}
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func NewCustomerAttributes(keypadSize model.KeypadSize) (*CustomerAttributes, error) {
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if keypadSize.IsDispersable() {
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return nil, errors.New("number of keys must be less than the number of attributes per key to be dispersion resistant")
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}
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attrVals, errAttr := util.GenerateRandomNonRepeatingUint64(keypadSize.TotalAttrs())
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if errAttr != nil {
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return nil, errAttr
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}
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setVals, errSet := util.GenerateRandomNonRepeatingUint64(keypadSize.AttrsPerKey)
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if errSet != nil {
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return nil, errSet
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}
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customerAttrs := CustomerAttributes{
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AttrVals: attrVals,
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SetVals: setVals,
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KeypadSize: keypadSize,
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}
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return &customerAttrs, nil
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}
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func (c *CustomerAttributes) Renew() error {
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attrVals, errAttr := util.GenerateRandomNonRepeatingUint64(c.KeypadSize.TotalAttrs())
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if errAttr != nil {
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return errAttr
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}
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setVals, errSet := util.GenerateRandomNonRepeatingUint64(c.KeypadSize.AttrsPerKey)
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if errSet != nil {
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return errSet
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}
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c.AttrVals = attrVals
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c.SetVals = setVals
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return nil
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}
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func (c *CustomerAttributes) IndexOfAttr(attrVal uint64) int {
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// TODO: should this be mapped instead?
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return util.IndexOf[uint64](c.AttrVals, attrVal)
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}
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func (c *CustomerAttributes) IndexOfSet(setVal uint64) (int, error) {
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// TODO: should this be mapped instead?
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idx := util.IndexOf[uint64](c.SetVals, setVal)
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if idx == -1 {
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return -1, errors.New(fmt.Sprintf("Set Val %d is invalid", setVal))
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}
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return idx, nil
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}
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func (c *CustomerAttributes) GetAttrSetVal(attrVal uint64) (uint64, error) {
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indexOfAttr := c.IndexOfAttr(attrVal)
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if indexOfAttr == -1 {
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return 0, errors.New(fmt.Sprintf("No attribute %d", attrVal))
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}
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setIdx := indexOfAttr % c.KeypadSize.AttrsPerKey
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return c.SetVals[setIdx], nil
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}
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