478 lines
14 KiB
Go
478 lines
14 KiB
Go
package native
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import (
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"bytes"
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"encoding/base64"
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"encoding/hex"
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"errors"
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"math/big"
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"strings"
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"unicode/utf8"
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"github.com/mr-tron/base58"
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"github.com/nspcc-dev/neo-go/pkg/config"
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"github.com/nspcc-dev/neo-go/pkg/core/dao"
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"github.com/nspcc-dev/neo-go/pkg/core/interop"
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"github.com/nspcc-dev/neo-go/pkg/core/native/nativenames"
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base58neogo "github.com/nspcc-dev/neo-go/pkg/encoding/base58"
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"github.com/nspcc-dev/neo-go/pkg/encoding/bigint"
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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/smartcontract/manifest"
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"github.com/nspcc-dev/neo-go/pkg/util/slice"
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"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
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)
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// Std represents an StdLib contract.
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type Std struct {
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interop.ContractMD
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}
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const (
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stdContractID = -2
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// stdMaxInputLength is the maximum input length for string-related methods.
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stdMaxInputLength = 1024
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)
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var (
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// ErrInvalidBase is returned when the base is invalid.
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ErrInvalidBase = errors.New("invalid base")
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// ErrInvalidFormat is returned when the string is not a number.
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ErrInvalidFormat = errors.New("invalid format")
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// ErrTooBigInput is returned when the input exceeds the size limit.
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ErrTooBigInput = errors.New("input is too big")
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)
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func newStd() *Std {
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s := &Std{ContractMD: *interop.NewContractMD(nativenames.StdLib, stdContractID)}
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defer s.UpdateHash()
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desc := newDescriptor("serialize", smartcontract.ByteArrayType,
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manifest.NewParameter("item", smartcontract.AnyType))
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md := newMethodAndPrice(s.serialize, 1<<12, callflag.NoneFlag)
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s.AddMethod(md, desc)
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desc = newDescriptor("deserialize", smartcontract.AnyType,
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manifest.NewParameter("data", smartcontract.ByteArrayType))
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md = newMethodAndPrice(s.deserialize, 1<<14, callflag.NoneFlag)
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s.AddMethod(md, desc)
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desc = newDescriptor("jsonSerialize", smartcontract.ByteArrayType,
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manifest.NewParameter("item", smartcontract.AnyType))
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md = newMethodAndPrice(s.jsonSerialize, 1<<12, callflag.NoneFlag)
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s.AddMethod(md, desc)
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desc = newDescriptor("jsonDeserialize", smartcontract.AnyType,
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manifest.NewParameter("json", smartcontract.ByteArrayType))
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md = newMethodAndPrice(s.jsonDeserialize, 1<<14, callflag.NoneFlag)
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s.AddMethod(md, desc)
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desc = newDescriptor("itoa", smartcontract.StringType,
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manifest.NewParameter("value", smartcontract.IntegerType),
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manifest.NewParameter("base", smartcontract.IntegerType))
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md = newMethodAndPrice(s.itoa, 1<<12, callflag.NoneFlag)
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s.AddMethod(md, desc)
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desc = newDescriptor("itoa", smartcontract.StringType,
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manifest.NewParameter("value", smartcontract.IntegerType))
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md = newMethodAndPrice(s.itoa10, 1<<12, callflag.NoneFlag)
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s.AddMethod(md, desc)
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desc = newDescriptor("atoi", smartcontract.IntegerType,
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manifest.NewParameter("value", smartcontract.StringType),
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manifest.NewParameter("base", smartcontract.IntegerType))
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md = newMethodAndPrice(s.atoi, 1<<6, callflag.NoneFlag)
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s.AddMethod(md, desc)
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desc = newDescriptor("atoi", smartcontract.IntegerType,
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manifest.NewParameter("value", smartcontract.StringType))
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md = newMethodAndPrice(s.atoi10, 1<<6, callflag.NoneFlag)
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s.AddMethod(md, desc)
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desc = newDescriptor("base64Encode", smartcontract.StringType,
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manifest.NewParameter("data", smartcontract.ByteArrayType))
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md = newMethodAndPrice(s.base64Encode, 1<<5, callflag.NoneFlag)
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s.AddMethod(md, desc)
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desc = newDescriptor("base64Decode", smartcontract.ByteArrayType,
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manifest.NewParameter("s", smartcontract.StringType))
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md = newMethodAndPrice(s.base64Decode, 1<<5, callflag.NoneFlag)
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s.AddMethod(md, desc)
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desc = newDescriptor("base58Encode", smartcontract.StringType,
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manifest.NewParameter("data", smartcontract.ByteArrayType))
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md = newMethodAndPrice(s.base58Encode, 1<<13, callflag.NoneFlag)
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s.AddMethod(md, desc)
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desc = newDescriptor("base58Decode", smartcontract.ByteArrayType,
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manifest.NewParameter("s", smartcontract.StringType))
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md = newMethodAndPrice(s.base58Decode, 1<<10, callflag.NoneFlag)
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s.AddMethod(md, desc)
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desc = newDescriptor("base58CheckEncode", smartcontract.StringType,
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manifest.NewParameter("data", smartcontract.ByteArrayType))
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md = newMethodAndPrice(s.base58CheckEncode, 1<<16, callflag.NoneFlag)
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s.AddMethod(md, desc)
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desc = newDescriptor("base58CheckDecode", smartcontract.ByteArrayType,
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manifest.NewParameter("s", smartcontract.StringType))
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md = newMethodAndPrice(s.base58CheckDecode, 1<<16, callflag.NoneFlag)
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s.AddMethod(md, desc)
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desc = newDescriptor("memoryCompare", smartcontract.IntegerType,
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manifest.NewParameter("str1", smartcontract.ByteArrayType),
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manifest.NewParameter("str2", smartcontract.ByteArrayType))
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md = newMethodAndPrice(s.memoryCompare, 1<<5, callflag.NoneFlag)
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s.AddMethod(md, desc)
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desc = newDescriptor("memorySearch", smartcontract.IntegerType,
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manifest.NewParameter("mem", smartcontract.ByteArrayType),
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manifest.NewParameter("value", smartcontract.ByteArrayType))
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md = newMethodAndPrice(s.memorySearch2, 1<<6, callflag.NoneFlag)
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s.AddMethod(md, desc)
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desc = newDescriptor("memorySearch", smartcontract.IntegerType,
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manifest.NewParameter("mem", smartcontract.ByteArrayType),
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manifest.NewParameter("value", smartcontract.ByteArrayType),
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manifest.NewParameter("start", smartcontract.IntegerType))
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md = newMethodAndPrice(s.memorySearch3, 1<<6, callflag.NoneFlag)
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s.AddMethod(md, desc)
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desc = newDescriptor("memorySearch", smartcontract.IntegerType,
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manifest.NewParameter("mem", smartcontract.ByteArrayType),
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manifest.NewParameter("value", smartcontract.ByteArrayType),
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manifest.NewParameter("start", smartcontract.IntegerType),
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manifest.NewParameter("backward", smartcontract.BoolType))
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md = newMethodAndPrice(s.memorySearch4, 1<<6, callflag.NoneFlag)
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s.AddMethod(md, desc)
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desc = newDescriptor("stringSplit", smartcontract.ArrayType,
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manifest.NewParameter("str", smartcontract.StringType),
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manifest.NewParameter("separator", smartcontract.StringType))
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md = newMethodAndPrice(s.stringSplit2, 1<<8, callflag.NoneFlag)
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s.AddMethod(md, desc)
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desc = newDescriptor("stringSplit", smartcontract.ArrayType,
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manifest.NewParameter("str", smartcontract.StringType),
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manifest.NewParameter("separator", smartcontract.StringType),
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manifest.NewParameter("removeEmptyEntries", smartcontract.BoolType))
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md = newMethodAndPrice(s.stringSplit3, 1<<8, callflag.NoneFlag)
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s.AddMethod(md, desc)
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desc = newDescriptor("strLen", smartcontract.IntegerType,
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manifest.NewParameter("str", smartcontract.StringType))
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md = newMethodAndPrice(s.strLen, 1<<8, callflag.NoneFlag)
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s.AddMethod(md, desc)
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return s
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}
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func (s *Std) serialize(ic *interop.Context, args []stackitem.Item) stackitem.Item {
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data, err := ic.DAO.GetItemCtx().Serialize(args[0], false)
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if err != nil {
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panic(err)
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}
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if len(data) > stackitem.MaxSize {
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panic(errors.New("too big item"))
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}
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return stackitem.NewByteArray(slice.Copy(data)) // Serialization context can be reused.
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}
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func (s *Std) deserialize(_ *interop.Context, args []stackitem.Item) stackitem.Item {
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data, err := args[0].TryBytes()
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if err != nil {
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panic(err)
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}
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item, err := stackitem.Deserialize(data)
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if err != nil {
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panic(err)
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}
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return item
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}
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func (s *Std) jsonSerialize(_ *interop.Context, args []stackitem.Item) stackitem.Item {
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data, err := stackitem.ToJSON(args[0])
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if err != nil {
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panic(err)
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}
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if len(data) > stackitem.MaxSize {
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panic(errors.New("too big item"))
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}
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return stackitem.NewByteArray(data)
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}
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func (s *Std) jsonDeserialize(ic *interop.Context, args []stackitem.Item) stackitem.Item {
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data, err := args[0].TryBytes()
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if err != nil {
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panic(err)
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}
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item, err := stackitem.FromJSON(data, stackitem.MaxDeserialized, ic.IsHardforkEnabled(config.HFBasilisk))
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if err != nil {
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panic(err)
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}
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return item
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}
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func (s *Std) itoa10(_ *interop.Context, args []stackitem.Item) stackitem.Item {
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num := toBigInt(args[0])
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return stackitem.NewByteArray([]byte(num.Text(10)))
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}
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func (s *Std) itoa(_ *interop.Context, args []stackitem.Item) stackitem.Item {
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num := toBigInt(args[0])
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base := toBigInt(args[1])
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if !base.IsInt64() {
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panic(ErrInvalidBase)
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}
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var str string
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switch b := base.Int64(); b {
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case 10:
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str = num.Text(10)
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case 16:
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if num.Sign() == 0 {
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str = "0"
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break
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}
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bs := bigint.ToBytes(num)
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slice.Reverse(bs)
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str = hex.EncodeToString(bs)
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if pad := bs[0] & 0xF8; pad == 0 || pad == 0xF8 {
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str = str[1:]
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}
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default:
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panic(ErrInvalidBase)
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}
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return stackitem.NewByteArray([]byte(str))
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}
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func (s *Std) atoi10(_ *interop.Context, args []stackitem.Item) stackitem.Item {
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num := s.toLimitedString(args[0])
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res := s.atoi10Aux(num)
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return stackitem.NewBigInteger(res)
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}
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func (s *Std) atoi10Aux(num string) *big.Int {
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bi, ok := new(big.Int).SetString(num, 10)
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if !ok {
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panic(ErrInvalidFormat)
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}
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return bi
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}
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func (s *Std) atoi(_ *interop.Context, args []stackitem.Item) stackitem.Item {
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num := s.toLimitedString(args[0])
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base := toBigInt(args[1])
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if !base.IsInt64() {
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panic(ErrInvalidBase)
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}
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var bi *big.Int
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switch b := base.Int64(); b {
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case 10:
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bi = s.atoi10Aux(num)
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case 16:
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changed := len(num)%2 != 0
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if changed {
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num = "0" + num
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}
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bs, err := hex.DecodeString(num)
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if err != nil {
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panic(ErrInvalidFormat)
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}
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if changed && bs[0]&0x8 != 0 {
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bs[0] |= 0xF0
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}
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slice.Reverse(bs)
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bi = bigint.FromBytes(bs)
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default:
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panic(ErrInvalidBase)
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}
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return stackitem.NewBigInteger(bi)
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}
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func (s *Std) base64Encode(_ *interop.Context, args []stackitem.Item) stackitem.Item {
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src := s.toLimitedBytes(args[0])
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result := base64.StdEncoding.EncodeToString(src)
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return stackitem.NewByteArray([]byte(result))
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}
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func (s *Std) base64Decode(_ *interop.Context, args []stackitem.Item) stackitem.Item {
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src := s.toLimitedString(args[0])
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result, err := base64.StdEncoding.DecodeString(src)
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if err != nil {
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panic(err)
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}
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return stackitem.NewByteArray(result)
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}
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func (s *Std) base58Encode(_ *interop.Context, args []stackitem.Item) stackitem.Item {
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src := s.toLimitedBytes(args[0])
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result := base58.Encode(src)
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return stackitem.NewByteArray([]byte(result))
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}
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func (s *Std) base58Decode(_ *interop.Context, args []stackitem.Item) stackitem.Item {
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src := s.toLimitedString(args[0])
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result, err := base58.Decode(src)
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if err != nil {
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panic(err)
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}
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return stackitem.NewByteArray(result)
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}
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func (s *Std) base58CheckEncode(_ *interop.Context, args []stackitem.Item) stackitem.Item {
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src := s.toLimitedBytes(args[0])
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result := base58neogo.CheckEncode(src)
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return stackitem.NewByteArray([]byte(result))
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}
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func (s *Std) base58CheckDecode(_ *interop.Context, args []stackitem.Item) stackitem.Item {
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src := s.toLimitedString(args[0])
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result, err := base58neogo.CheckDecode(src)
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if err != nil {
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panic(err)
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}
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return stackitem.NewByteArray(result)
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}
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func (s *Std) memoryCompare(_ *interop.Context, args []stackitem.Item) stackitem.Item {
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s1 := s.toLimitedBytes(args[0])
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s2 := s.toLimitedBytes(args[1])
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return stackitem.NewBigInteger(big.NewInt(int64(bytes.Compare(s1, s2))))
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}
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func (s *Std) memorySearch2(_ *interop.Context, args []stackitem.Item) stackitem.Item {
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mem := s.toLimitedBytes(args[0])
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val := s.toLimitedBytes(args[1])
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index := s.memorySearchAux(mem, val, 0, false)
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return stackitem.NewBigInteger(big.NewInt(int64(index)))
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}
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func (s *Std) memorySearch3(_ *interop.Context, args []stackitem.Item) stackitem.Item {
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mem := s.toLimitedBytes(args[0])
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val := s.toLimitedBytes(args[1])
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start := toUint32(args[2])
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index := s.memorySearchAux(mem, val, int(start), false)
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return stackitem.NewBigInteger(big.NewInt(int64(index)))
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}
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func (s *Std) memorySearch4(_ *interop.Context, args []stackitem.Item) stackitem.Item {
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mem := s.toLimitedBytes(args[0])
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val := s.toLimitedBytes(args[1])
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start := toUint32(args[2])
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backward, err := args[3].TryBool()
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if err != nil {
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panic(err)
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}
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index := s.memorySearchAux(mem, val, int(start), backward)
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return stackitem.NewBigInteger(big.NewInt(int64(index)))
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}
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func (s *Std) memorySearchAux(mem, val []byte, start int, backward bool) int {
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if backward {
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if start > len(mem) { // panic in case if cap(mem) > len(mem) for some reasons
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panic("invalid start index")
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}
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return bytes.LastIndex(mem[:start], val)
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}
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index := bytes.Index(mem[start:], val)
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if index < 0 {
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return -1
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}
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return index + start
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}
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func (s *Std) stringSplit2(_ *interop.Context, args []stackitem.Item) stackitem.Item {
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str := s.toLimitedString(args[0])
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sep := toString(args[1])
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return stackitem.NewArray(s.stringSplitAux(str, sep, false))
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}
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func (s *Std) stringSplit3(_ *interop.Context, args []stackitem.Item) stackitem.Item {
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str := s.toLimitedString(args[0])
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sep := toString(args[1])
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removeEmpty, err := args[2].TryBool()
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if err != nil {
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panic(err)
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}
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return stackitem.NewArray(s.stringSplitAux(str, sep, removeEmpty))
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}
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func (s *Std) stringSplitAux(str, sep string, removeEmpty bool) []stackitem.Item {
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var result []stackitem.Item
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arr := strings.Split(str, sep)
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for i := range arr {
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if !removeEmpty || len(arr[i]) != 0 {
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result = append(result, stackitem.Make(arr[i]))
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}
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}
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return result
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}
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func (s *Std) strLen(_ *interop.Context, args []stackitem.Item) stackitem.Item {
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str := s.toLimitedString(args[0])
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return stackitem.NewBigInteger(big.NewInt(int64(utf8.RuneCountInString(str))))
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}
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// Metadata implements the Contract interface.
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func (s *Std) Metadata() *interop.ContractMD {
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return &s.ContractMD
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}
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// Initialize implements the Contract interface.
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func (s *Std) Initialize(ic *interop.Context) error {
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return nil
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}
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// InitializeCache implements the Contract interface.
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func (s *Std) InitializeCache(blockHeight uint32, d *dao.Simple) error {
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return nil
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}
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// OnPersist implements the Contract interface.
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func (s *Std) OnPersist(ic *interop.Context) error {
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return nil
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}
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// PostPersist implements the Contract interface.
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func (s *Std) PostPersist(ic *interop.Context) error {
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return nil
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}
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func (s *Std) toLimitedBytes(item stackitem.Item) []byte {
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src, err := item.TryBytes()
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if err != nil {
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panic(err)
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}
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if len(src) > stdMaxInputLength {
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panic(ErrTooBigInput)
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}
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return src
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}
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func (s *Std) toLimitedString(item stackitem.Item) string {
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src := toString(item)
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if len(src) > stdMaxInputLength {
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panic(ErrTooBigInput)
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}
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return src
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}
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