idiomatic project structure

internal/models/customer.go

@@ -0,0 +1,84 @@
+package models
+
+import (
+	"github.com/google/uuid"
+	"go-nkode/config"
+	"go-nkode/internal/security"
+	"go-nkode/internal/utils"
+)
+
+type Customer struct {
+	Id          CustomerId
+	NKodePolicy NKodePolicy
+	Attributes  CustomerAttributes
+}
+
+func NewCustomer(nkodePolicy NKodePolicy) (*Customer, error) {
+	customerAttrs, err := NewCustomerAttributes()
+	if err != nil {
+		return nil, err
+	}
+	customer := Customer{
+		Id:          CustomerId(uuid.New()),
+		NKodePolicy: nkodePolicy,
+		Attributes:  *customerAttrs,
+	}
+
+	return &customer, nil
+}
+
+func (c *Customer) IsValidNKode(kp KeypadDimension, passcodeAttrIdx []int) error {
+	nkodeLen := len(passcodeAttrIdx)
+	if nkodeLen < c.NKodePolicy.MinNkodeLen || nkodeLen > c.NKodePolicy.MaxNkodeLen {
+		return config.ErrInvalidNKodeLength
+	}
+
+	if validIdx := kp.ValidateAttributeIndices(passcodeAttrIdx); !validIdx {
+		return config.ErrInvalidNKodeIdx
+	}
+	passcodeSetVals := make(utils.Set[uint64])
+	passcodeAttrVals := make(utils.Set[uint64])
+	attrVals, err := c.Attributes.AttrValsForKp(kp)
+	if err != nil {
+		return err
+	}
+	for idx := 0; idx < nkodeLen; idx++ {
+		attrVal := attrVals[passcodeAttrIdx[idx]]
+		setVal, err := c.Attributes.GetAttrSetVal(attrVal, kp)
+		if err != nil {
+			return err
+		}
+		passcodeSetVals.Add(setVal)
+		passcodeAttrVals.Add(attrVal)
+	}
+
+	if passcodeSetVals.Size() < c.NKodePolicy.DistinctSets {
+		return config.ErrTooFewDistinctSet
+	}
+
+	if passcodeAttrVals.Size() < c.NKodePolicy.DistinctAttributes {
+		return config.ErrTooFewDistinctAttributes
+	}
+	return nil
+}
+
+func (c *Customer) RenewKeys() ([]uint64, []uint64, error) {
+	oldAttrs := make([]uint64, len(c.Attributes.AttrVals))
+	oldSets := make([]uint64, len(c.Attributes.SetVals))
+
+	copy(oldAttrs, c.Attributes.AttrVals)
+	copy(oldSets, c.Attributes.SetVals)
+
+	if err := c.Attributes.Renew(); err != nil {
+		return nil, nil, err
+	}
+	attrsXor, err := security.XorLists(oldAttrs, c.Attributes.AttrVals)
+	if err != nil {
+		return nil, nil, err
+	}
+	setXor, err := security.XorLists(oldSets, c.Attributes.SetVals)
+	if err != nil {
+		return nil, nil, err
+	}
+	return setXor, attrsXor, nil
+}