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