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certificate_simple_json.go
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certificate_simple_json.go
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// Copyright © 2024 Galactica Network
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package zkcertificate
import (
"encoding/json"
"fmt"
"math/big"
"sort"
"github.com/iden3/go-iden3-crypto/poseidon"
)
// SimpleJSON represents the input data for data that consists of
// simple JSON fields: strings only.
type SimpleJSON map[string]string
// FFEncode implements FFEncoder.
func (c SimpleJSON) FFEncode() (SimpleJSONContent, error) {
keys := make([]string, 0, len(c))
for key := range c {
keys = append(keys, key)
}
sort.Strings(keys)
hashedContent := make(SimpleJSONContent, len(c))
for i, key := range keys {
value := c[key]
hash, err := poseidon.HashBytes([]byte(value))
if err != nil {
return nil, fmt.Errorf("hash field %s: %w", key, err)
}
hashedContent[i] = HashFromBigInt(hash)
}
return hashedContent, nil
}
// Validate performs validation on the SimpleJSON instance.
func (c *SimpleJSON) Validate() error {
return nil
}
// UnmarshalJSON implements [json.Unmarshaler].
func (c *SimpleJSON) UnmarshalJSON(data []byte) error {
var tempMap map[string]string
if err := json.Unmarshal(data, &tempMap); err != nil {
return err
}
*c = SimpleJSON(tempMap)
return nil
}
// SimpleJSONContent represents the hashed content of SimpleJSON data.
// It ordered by the SimpleJSON data key's natural order.
type SimpleJSONContent []Hash
// Standard returns the standard associated with the SimpleJSONContent, which is StandardSimpleJSON.
func (c SimpleJSONContent) Standard() Standard {
return StandardSimpleJSON
}
// Hash computes and returns the hash of the SimpleJSONContent instance.
func (c SimpleJSONContent) Hash() (Hash, error) {
hashInputs := make([]*big.Int, len(c))
for i, hash := range c {
hashInputs[i] = hash.BigInt()
}
hash, err := poseidon.Hash(hashInputs)
if err != nil {
return Hash{}, err
}
return HashFromBigInt(hash), nil
}