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: val, err := fp.Value.GetBoolean() // not GetBooleanStrict(), because that's the way C# code works if err != nil { return errors.New("not a bool") } if val { emit.Int(script, 1) } else { emit.Int(script, 0) } 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) case smartcontract.AnyType: if fp.Value.IsNull() { emit.Opcodes(script, opcode.PUSHNULL) } 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-- { if slice, err := params[i].GetArray(); err == nil { err = ExpandArrayIntoScript(script.BinWriter, slice) if err != nil { return nil, err } emit.Int(script.BinWriter, int64(len(slice))) emit.Opcodes(script.BinWriter, opcode.PACK) } else if s, err := params[i].GetStringStrict(); err == nil { emit.String(script.BinWriter, s) } else if n, err := params[i].GetIntStrict(); err == nil { emit.String(script.BinWriter, strconv.Itoa(n)) } else if b, err := params[i].GetBooleanStrict(); err == nil { emit.Bool(script.BinWriter, b) } else { return nil, fmt.Errorf("failed to convert parmeter %s to script parameter", params[i]) } } if len(params) == 0 { emit.Opcodes(script.BinWriter, opcode.NEWARRAY0) } emit.AppCallNoArgs(script.BinWriter, contract, method, callflag.All) return script.Bytes(), nil }