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https://github.com/nspcc-dev/neo-go.git
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5b470f14cc
N3 contracts require method and array of arguments to function correctly, but CreateFunctionInvocationScript can produce scripts that won't work correctly if one is to pass anything but a single array parameter to it. This doesn't make much sense, so we can always expect there to be an array of parameters in the third positional invokefunction argument (the same way C# node does).
122 lines
3.2 KiB
Go
122 lines
3.2 KiB
Go
package request
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import (
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"errors"
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"fmt"
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"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
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"github.com/nspcc-dev/neo-go/pkg/io"
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"github.com/nspcc-dev/neo-go/pkg/smartcontract"
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"github.com/nspcc-dev/neo-go/pkg/smartcontract/callflag"
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"github.com/nspcc-dev/neo-go/pkg/util"
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"github.com/nspcc-dev/neo-go/pkg/vm/emit"
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"github.com/nspcc-dev/neo-go/pkg/vm/opcode"
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)
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// ExpandArrayIntoScript pushes all FuncParam parameters from the given array
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// into the given buffer in reverse order.
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func ExpandArrayIntoScript(script *io.BinWriter, slice []Param) error {
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for j := len(slice) - 1; j >= 0; j-- {
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fp, err := slice[j].GetFuncParam()
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if err != nil {
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return err
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}
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switch fp.Type {
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case smartcontract.ByteArrayType:
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str, err := fp.Value.GetBytesBase64()
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if err != nil {
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return err
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}
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emit.Bytes(script, str)
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case smartcontract.SignatureType:
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str, err := fp.Value.GetBytesHex()
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if err != nil {
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return err
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}
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emit.Bytes(script, str)
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case smartcontract.StringType:
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str, err := fp.Value.GetString()
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if err != nil {
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return err
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}
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emit.String(script, str)
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case smartcontract.Hash160Type:
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hash, err := fp.Value.GetUint160FromHex()
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if err != nil {
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return err
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}
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emit.Bytes(script, hash.BytesBE())
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case smartcontract.Hash256Type:
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hash, err := fp.Value.GetUint256()
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if err != nil {
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return err
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}
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emit.Bytes(script, hash.BytesBE())
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case smartcontract.PublicKeyType:
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str, err := fp.Value.GetString()
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if err != nil {
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return err
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}
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key, err := keys.NewPublicKeyFromString(string(str))
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if err != nil {
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return err
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}
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emit.Bytes(script, key.Bytes())
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case smartcontract.IntegerType:
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val, err := fp.Value.GetInt()
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if err != nil {
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return err
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}
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emit.Int(script, int64(val))
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case smartcontract.BoolType:
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val, err := fp.Value.GetBoolean() // not GetBooleanStrict(), because that's the way C# code works
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if err != nil {
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return errors.New("not a bool")
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}
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if val {
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emit.Int(script, 1)
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} else {
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emit.Int(script, 0)
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}
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case smartcontract.ArrayType:
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val, err := fp.Value.GetArray()
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if err != nil {
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return err
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}
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err = ExpandArrayIntoScript(script, val)
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if err != nil {
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return err
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}
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emit.Int(script, int64(len(val)))
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emit.Opcodes(script, opcode.PACK)
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case smartcontract.AnyType:
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if fp.Value.IsNull() {
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emit.Opcodes(script, opcode.PUSHNULL)
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}
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default:
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return fmt.Errorf("parameter type %v is not supported", fp.Type)
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}
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}
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return nil
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}
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// CreateFunctionInvocationScript creates a script to invoke given contract with
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// given parameters.
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func CreateFunctionInvocationScript(contract util.Uint160, method string, param *Param) ([]byte, error) {
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script := io.NewBufBinWriter()
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if param == nil {
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emit.Opcodes(script.BinWriter, opcode.NEWARRAY0)
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} else if slice, err := param.GetArray(); err == nil {
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err = ExpandArrayIntoScript(script.BinWriter, slice)
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if err != nil {
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return nil, err
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}
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emit.Int(script.BinWriter, int64(len(slice)))
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emit.Opcodes(script.BinWriter, opcode.PACK)
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} else {
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return nil, fmt.Errorf("failed to convert %s to script parameter", param)
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}
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emit.AppCallNoArgs(script.BinWriter, contract, method, callflag.All)
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return script.Bytes(), nil
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}
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