neoneo-go/pkg/rpc/request/txBuilder.go
2021-04-28 16:44:19 +03:00

136 lines
3.4 KiB
Go

package request
import (
"errors"
"fmt"
"strconv"
"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
"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"
)
// ExpandArrayIntoScript pushes all FuncParam parameters from the given array
// into the given buffer in reverse order.
func ExpandArrayIntoScript(script *io.BinWriter, slice []Param) error {
for j := len(slice) - 1; j >= 0; j-- {
fp, err := slice[j].GetFuncParam()
if err != nil {
return err
}
switch fp.Type {
case smartcontract.ByteArrayType:
str, err := fp.Value.GetBytesBase64()
if err != nil {
return err
}
emit.Bytes(script, str)
case smartcontract.SignatureType:
str, err := fp.Value.GetBytesHex()
if err != nil {
return err
}
emit.Bytes(script, str)
case smartcontract.StringType:
str, err := fp.Value.GetString()
if err != nil {
return err
}
emit.String(script, str)
case smartcontract.Hash160Type:
hash, err := fp.Value.GetUint160FromHex()
if err != nil {
return err
}
emit.Bytes(script, hash.BytesBE())
case smartcontract.Hash256Type:
hash, err := fp.Value.GetUint256()
if err != nil {
return err
}
emit.Bytes(script, hash.BytesBE())
case smartcontract.PublicKeyType:
str, err := fp.Value.GetString()
if err != nil {
return err
}
key, err := keys.NewPublicKeyFromString(string(str))
if err != nil {
return err
}
emit.Bytes(script, key.Bytes())
case smartcontract.IntegerType:
val, err := fp.Value.GetInt()
if err != nil {
return err
}
emit.Int(script, int64(val))
case smartcontract.BoolType:
str, err := fp.Value.GetString()
if err != nil {
return err
}
switch str {
case "true":
emit.Int(script, 1)
case "false":
emit.Int(script, 0)
default:
return errors.New("wrong boolean value")
}
case smartcontract.ArrayType:
val, err := fp.Value.GetArray()
if err != nil {
return err
}
err = ExpandArrayIntoScript(script, val)
if err != nil {
return err
}
emit.Int(script, int64(len(val)))
emit.Opcodes(script, opcode.PACK)
default:
return fmt.Errorf("parameter type %v is not supported", fp.Type)
}
}
return nil
}
// CreateFunctionInvocationScript creates a script to invoke given contract with
// given parameters.
func CreateFunctionInvocationScript(contract util.Uint160, method string, params Params) ([]byte, error) {
script := io.NewBufBinWriter()
for i := len(params) - 1; i >= 0; i-- {
switch params[i].Type {
case StringT:
emit.String(script.BinWriter, params[i].String())
case NumberT:
num, err := params[i].GetInt()
if err != nil {
return nil, err
}
emit.String(script.BinWriter, strconv.Itoa(num))
case BooleanT:
val := params[i].GetBoolean()
emit.Bool(script.BinWriter, val)
case ArrayT:
slice, err := params[i].GetArray()
if err != nil {
return nil, err
}
err = ExpandArrayIntoScript(script.BinWriter, slice)
if err != nil {
return nil, err
}
emit.Int(script.BinWriter, int64(len(slice)))
emit.Opcodes(script.BinWriter, opcode.PACK)
}
}
emit.AppCallNoArgs(script.BinWriter, contract, method, callflag.All)
return script.Bytes(), nil
}