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nep11.go
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nep11.go
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package client
import (
"fmt"
"github.com/nspcc-dev/neo-go/pkg/core/transaction"
"github.com/nspcc-dev/neo-go/pkg/encoding/address"
"github.com/nspcc-dev/neo-go/pkg/io"
"github.com/nspcc-dev/neo-go/pkg/smartcontract"
"github.com/nspcc-dev/neo-go/pkg/smartcontract/callflag"
"github.com/nspcc-dev/neo-go/pkg/util"
"github.com/nspcc-dev/neo-go/pkg/vm/emit"
"github.com/nspcc-dev/neo-go/pkg/vm/opcode"
"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
"github.com/nspcc-dev/neo-go/pkg/wallet"
)
// NEP11Decimals invokes `decimals` NEP11 method on a specified contract.
func (c *Client) NEP11Decimals(tokenHash util.Uint160) (int64, error) {
return c.nepDecimals(tokenHash)
}
// NEP11Symbol invokes `symbol` NEP11 method on a specified contract.
func (c *Client) NEP11Symbol(tokenHash util.Uint160) (string, error) {
return c.nepSymbol(tokenHash)
}
// NEP11TotalSupply invokes `totalSupply` NEP11 method on a specified contract.
func (c *Client) NEP11TotalSupply(tokenHash util.Uint160) (int64, error) {
return c.nepTotalSupply(tokenHash)
}
// NEP11BalanceOf invokes `balanceOf` NEP11 method on a specified contract.
func (c *Client) NEP11BalanceOf(tokenHash, owner util.Uint160) (int64, error) {
return c.nepBalanceOf(tokenHash, owner, nil)
}
// TransferNEP11 creates an invocation transaction that invokes 'transfer' method
// on a given token to move the whole NEP11 token with the specified token ID to
// given account and sends it to the network returning just a hash of it.
func (c *Client) TransferNEP11(acc *wallet.Account, to util.Uint160,
tokenHash util.Uint160, tokenID string, gas int64) (util.Uint256, error) {
if !c.initDone {
return util.Uint256{}, errNetworkNotInitialized
}
tx, err := c.createNEP11TransferTx(acc, tokenHash, gas, to, tokenID)
if err != nil {
return util.Uint256{}, err
}
if err := acc.SignTx(c.GetNetwork(), tx); err != nil {
return util.Uint256{}, fmt.Errorf("can't sign NEP11 transfer tx: %w", err)
}
return c.SendRawTransaction(tx)
}
// createNEP11TransferTx is an internal helper for TransferNEP11 and
// TransferNEP11D which creates an invocation transaction for the
// 'transfer' method of a given contract (token) to move the whole (or the
// specified amount of) NEP11 token with the specified token ID to given account
// and returns it. The returned transaction is not signed.
// `args` for TransferNEP11: to util.Uint160, tokenID string;
// `args` for TransferNEP11D: from, to util.Uint160, amount int64, tokenID string.
func (c *Client) createNEP11TransferTx(acc *wallet.Account, tokenHash util.Uint160,
gas int64, args ...interface{}) (*transaction.Transaction, error) {
w := io.NewBufBinWriter()
emit.AppCall(w.BinWriter, tokenHash, "transfer", callflag.All, args...)
emit.Opcodes(w.BinWriter, opcode.ASSERT)
if w.Err != nil {
return nil, fmt.Errorf("failed to create NEP11 transfer script: %w", w.Err)
}
from, err := address.StringToUint160(acc.Address)
if err != nil {
return nil, fmt.Errorf("bad account address: %w", err)
}
return c.CreateTxFromScript(w.Bytes(), acc, -1, gas, []SignerAccount{{
Signer: transaction.Signer{
Account: from,
Scopes: transaction.CalledByEntry,
},
Account: acc,
}})
}
// Non-divisible NFT methods section start.
// NEP11NDOwnerOf invokes `ownerOf` non-devisible NEP11 method with the
// specified token ID on a specified contract.
func (c *Client) NEP11NDOwnerOf(tokenHash util.Uint160, tokenID string) (util.Uint160, error) {
result, err := c.InvokeFunction(tokenHash, "ownerOf", []smartcontract.Parameter{
{
Type: smartcontract.StringType,
Value: tokenID,
},
}, nil)
if err != nil {
return util.Uint160{}, err
}
err = getInvocationError(result)
if err != nil {
return util.Uint160{}, err
}
return topUint160FromStack(result.Stack)
}
// Non-divisible NFT methods section end.
// Divisible NFT methods section start.
// TransferNEP11D creates an invocation transaction that invokes 'transfer'
// method on a given token to move specified amount of divisible NEP11 assets
// (in FixedN format using contract's number of decimals) to given account and
// sends it to the network returning just a hash of it.
func (c *Client) TransferNEP11D(acc *wallet.Account, to util.Uint160,
tokenHash util.Uint160, amount int64, tokenID string, gas int64) (util.Uint256, error) {
if !c.initDone {
return util.Uint256{}, errNetworkNotInitialized
}
from, err := address.StringToUint160(acc.Address)
if err != nil {
return util.Uint256{}, fmt.Errorf("bad account address: %w", err)
}
tx, err := c.createNEP11TransferTx(acc, tokenHash, gas, acc.Address, from, to, amount, tokenID)
if err != nil {
return util.Uint256{}, err
}
if err := acc.SignTx(c.GetNetwork(), tx); err != nil {
return util.Uint256{}, fmt.Errorf("can't sign NEP11 divisible transfer tx: %w", err)
}
return c.SendRawTransaction(tx)
}
// NEP11DBalanceOf invokes `balanceOf` divisible NEP11 method on a
// specified contract.
func (c *Client) NEP11DBalanceOf(tokenHash, owner util.Uint160, tokenID string) (int64, error) {
return c.nepBalanceOf(tokenHash, owner, &tokenID)
}
// Divisible NFT methods section end.
// Optional NFT methods section start.
// NEP11Properties invokes `properties` optional NEP11 method on a
// specified contract.
func (c *Client) NEP11Properties(tokenHash util.Uint160, tokenID string) (*stackitem.Map, error) {
result, err := c.InvokeFunction(tokenHash, "properties", []smartcontract.Parameter{{
Type: smartcontract.StringType,
Value: tokenID,
}}, nil)
if err != nil {
return nil, err
}
err = getInvocationError(result)
if err != nil {
return nil, err
}
return topMapFromStack(result.Stack)
}
// Optional NFT methods section end.