130 lines
3.5 KiB
Go
130 lines
3.5 KiB
Go
package params
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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 the 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.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.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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bi, err := fp.Value.GetBigInt()
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if err != nil {
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return err
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}
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emit.BigInt(script, bi)
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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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emit.Bool(script, val)
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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 = ExpandArrayIntoScriptAndPack(script, val)
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if err != nil {
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return err
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}
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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 script.Err
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}
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// ExpandArrayIntoScriptAndPack expands provided array into script and packs the
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// resulting items in the array.
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func ExpandArrayIntoScriptAndPack(script *io.BinWriter, slice []Param) error {
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if len(slice) == 0 {
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emit.Opcodes(script, opcode.NEWARRAY0)
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return script.Err
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}
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err := ExpandArrayIntoScript(script, slice)
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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(slice)))
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emit.Opcodes(script, opcode.PACK)
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return script.Err
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}
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// CreateFunctionInvocationScript creates a script to invoke the given contract with
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// the 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 = ExpandArrayIntoScriptAndPack(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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} 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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