neoneo-go/cli/paramcontext/context.go

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package paramcontext
import (
"encoding/json"
"fmt"
"io/ioutil"
"github.com/nspcc-dev/neo-go/pkg/core/transaction"
"github.com/nspcc-dev/neo-go/pkg/smartcontract/context"
"github.com/nspcc-dev/neo-go/pkg/wallet"
)
// validUntilBlockIncrement is the number of extra blocks to add to an exported transaction
const validUntilBlockIncrement = 50
// InitAndSave creates incompletely signed transaction which can used
// as input to `multisig sign`.
func InitAndSave(tx *transaction.Transaction, acc *wallet.Account, filename string) error {
// avoid fast transaction expiration
tx.ValidUntilBlock += validUntilBlockIncrement
priv := acc.PrivateKey()
pub := priv.PublicKey()
sign := priv.Sign(tx.GetSignedPart())
scCtx := context.NewParameterContext("Neo.Core.ContractTransaction", tx)
if err := scCtx.AddSignature(acc.Contract, pub, sign); err != nil {
return fmt.Errorf("can't add signature: %w", err)
}
return Save(scCtx, filename)
}
// Read reads parameter context from file.
func Read(filename string) (*context.ParameterContext, error) {
data, err := ioutil.ReadFile(filename)
if err != nil {
return nil, fmt.Errorf("can't read input file: %w", err)
}
c := new(context.ParameterContext)
if err := json.Unmarshal(data, c); err != nil {
return nil, fmt.Errorf("can't parse transaction: %w", err)
}
return c, nil
}
// Save writes parameter context to file.
func Save(c *context.ParameterContext, filename string) error {
if data, err := json.Marshal(c); err != nil {
return fmt.Errorf("can't marshal transaction: %w", err)
} else if err := ioutil.WriteFile(filename, data, 0644); err != nil {
return fmt.Errorf("can't write transaction to file: %w", err)
}
return nil
}