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object.go
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object.go
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package bot
import (
"bytes"
"context"
"encoding/hex"
"encoding/json"
"fmt"
"time"
"unicode/utf8"
"github.com/MixinNetwork/go-number"
"github.com/MixinNetwork/mixin/common"
"github.com/gofrs/uuid"
"github.com/vmihailenco/msgpack/v4"
)
type ObjectInput struct {
Amount number.Decimal
TraceId string
Memo string
}
func CreateObject(ctx context.Context, in *ObjectInput, uid, sid, sessionKey, pin, pinToken string) (*Snapshot, error) {
if in.Amount.Exhausted() {
return nil, fmt.Errorf("amount exhausted")
}
encryptedPIN, err := EncryptPIN(pin, pinToken, sid, sessionKey, uint64(time.Now().UnixNano()))
if err != nil {
return nil, err
}
data, err := json.Marshal(map[string]interface{}{
"amount": in.Amount,
"trace_id": in.TraceId,
"memo": in.Memo,
"pin": encryptedPIN,
})
if err != nil {
return nil, err
}
path := "/objects"
token, err := SignAuthenticationToken(uid, sid, sessionKey, "POST", path, string(data))
if err != nil {
return nil, err
}
id := UuidNewV4().String()
body, err := RequestWithId(ctx, "POST", path, data, token, id)
if err != nil {
return nil, err
}
var resp struct {
Data *Snapshot `json:"data"`
Error Error `json:"error"`
}
err = json.Unmarshal(body, &resp)
if err != nil {
return nil, err
}
if resp.Error.Code > 0 {
return nil, resp.Error
}
return resp.Data, nil
}
func EstimateObjectFee(memo string) number.Decimal {
extra := EncodeMixinExtra(uuid.Nil.String(), memo)
return number.FromString(fmt.Sprint(len(extra)/1024 + 2)).Mul(number.FromString("0.0015"))
}
type MixinExtraPack struct {
T uuid.UUID
M string `msgpack:",omitempty"`
}
func EncodeMixinExtra(traceId, memo string) []byte {
id, err := uuid.FromString(traceId)
if err != nil {
panic(err)
}
p := &MixinExtraPack{T: id, M: memo}
b := MsgpackMarshalPanic(p)
if len(b) >= common.ExtraSizeStorageCapacity {
panic(memo)
}
return b
}
func DecodeMixinExtra(b []byte) *MixinExtraPack {
var p MixinExtraPack
err := MsgpackUnmarshal(b, &p)
if err == nil && (p.M != "" || p.T.String() != uuid.Nil.String()) {
return &p
}
if utf8.Valid(b) {
p.M = string(b)
} else {
p.M = hex.EncodeToString(b)
}
return &p
}
func MsgpackMarshalPanic(val interface{}) []byte {
var buf bytes.Buffer
enc := msgpack.NewEncoder(&buf).UseCompactEncoding(true).SortMapKeys(true)
err := enc.Encode(val)
if err != nil {
panic(fmt.Errorf("MsgpackMarshalPanic: %#v %s", val, err.Error()))
}
return buf.Bytes()
}
func MsgpackUnmarshal(data []byte, val interface{}) error {
err := msgpack.Unmarshal(data, val)
if err == nil {
return err
}
return fmt.Errorf("MsgpackUnmarshal: %s %s", hex.EncodeToString(data), err.Error())
}