forked from TrueCloudLab/neoneo-go
243 lines
6.9 KiB
Go
243 lines
6.9 KiB
Go
package core
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import (
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"crypto/elliptic"
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"errors"
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"fmt"
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"math"
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"github.com/nspcc-dev/neo-go/pkg/core/block"
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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"
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"github.com/nspcc-dev/neo-go/pkg/core/state"
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"github.com/nspcc-dev/neo-go/pkg/core/transaction"
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"github.com/nspcc-dev/neo-go/pkg/crypto/hash"
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"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
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"github.com/nspcc-dev/neo-go/pkg/smartcontract"
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"github.com/nspcc-dev/neo-go/pkg/util"
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"github.com/nspcc-dev/neo-go/pkg/vm"
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"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
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)
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const (
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// MaxStorageKeyLen is the maximum length of a key for storage items.
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MaxStorageKeyLen = 64
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// MaxStorageValueLen is the maximum length of a value for storage items.
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// It is set to be the maximum value for uint16.
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MaxStorageValueLen = 65535
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)
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// StorageContext contains storing id and read/write flag, it's used as
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// a context for storage manipulation functions.
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type StorageContext struct {
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ID int32
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ReadOnly bool
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}
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// StorageFlag represents storage flag which denotes whether the stored value is
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// a constant.
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type StorageFlag byte
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const (
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// None is a storage flag for non-constant items.
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None StorageFlag = 0
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// Constant is a storage flag for constant items.
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Constant StorageFlag = 0x01
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)
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// engineGetScriptContainer returns transaction or block that contains the script
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// being run.
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func engineGetScriptContainer(ic *interop.Context) error {
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var item stackitem.Item
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switch t := ic.Container.(type) {
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case *transaction.Transaction:
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item = native.TransactionToStackItem(t)
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case *block.Block:
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item = native.BlockToStackItem(t)
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default:
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return errors.New("unknown script container")
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}
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ic.VM.Estack().PushVal(item)
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return nil
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}
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// storageDelete deletes stored key-value pair.
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func storageDelete(ic *interop.Context) error {
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stcInterface := ic.VM.Estack().Pop().Value()
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stc, ok := stcInterface.(*StorageContext)
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if !ok {
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return fmt.Errorf("%T is not a StorageContext", stcInterface)
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}
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if stc.ReadOnly {
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return errors.New("StorageContext is read only")
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}
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ic.VM.AddGas(ic.Chain.GetPolicer().GetStoragePrice())
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key := ic.VM.Estack().Pop().Bytes()
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return ic.DAO.DeleteStorageItem(stc.ID, key)
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}
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// storageGet returns stored key-value pair.
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func storageGet(ic *interop.Context) error {
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stcInterface := ic.VM.Estack().Pop().Value()
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stc, ok := stcInterface.(*StorageContext)
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if !ok {
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return fmt.Errorf("%T is not a StorageContext", stcInterface)
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}
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key := ic.VM.Estack().Pop().Bytes()
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si := ic.DAO.GetStorageItem(stc.ID, key)
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if si != nil {
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ic.VM.Estack().PushVal([]byte(si))
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} else {
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ic.VM.Estack().PushVal(stackitem.Null{})
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}
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return nil
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}
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// storageGetContext returns storage context (scripthash).
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func storageGetContext(ic *interop.Context) error {
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return storageGetContextInternal(ic, false)
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}
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// storageGetReadOnlyContext returns read-only context (scripthash).
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func storageGetReadOnlyContext(ic *interop.Context) error {
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return storageGetContextInternal(ic, true)
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}
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// storageGetContextInternal is internal version of storageGetContext and
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// storageGetReadOnlyContext which allows to specify ReadOnly context flag.
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func storageGetContextInternal(ic *interop.Context, isReadOnly bool) error {
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contract, err := ic.GetContract(ic.VM.GetCurrentScriptHash())
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if err != nil {
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return err
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}
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sc := &StorageContext{
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ID: contract.ID,
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ReadOnly: isReadOnly,
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}
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ic.VM.Estack().PushVal(stackitem.NewInterop(sc))
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return nil
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}
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func putWithContext(ic *interop.Context, stc *StorageContext, key []byte, value []byte) error {
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if len(key) > MaxStorageKeyLen {
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return errors.New("key is too big")
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}
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if len(value) > MaxStorageValueLen {
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return errors.New("value is too big")
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}
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if stc.ReadOnly {
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return errors.New("StorageContext is read only")
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}
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si := ic.DAO.GetStorageItem(stc.ID, key)
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sizeInc := len(value)
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if si == nil {
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si = state.StorageItem{}
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sizeInc = len(key) + len(value)
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} else if len(value) != 0 {
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if len(value) <= len(si) {
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sizeInc = (len(value)-1)/4 + 1
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} else if len(si) != 0 {
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sizeInc = (len(si)-1)/4 + 1 + len(value) - len(si)
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}
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}
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if !ic.VM.AddGas(int64(sizeInc) * ic.Chain.GetPolicer().GetStoragePrice()) {
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return errGasLimitExceeded
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}
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return ic.DAO.PutStorageItem(stc.ID, key, value)
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}
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// storagePut puts key-value pair into the storage.
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func storagePut(ic *interop.Context) error {
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stcInterface := ic.VM.Estack().Pop().Value()
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stc, ok := stcInterface.(*StorageContext)
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if !ok {
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return fmt.Errorf("%T is not a StorageContext", stcInterface)
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}
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key := ic.VM.Estack().Pop().Bytes()
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value := ic.VM.Estack().Pop().Bytes()
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return putWithContext(ic, stc, key, value)
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}
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// storageContextAsReadOnly sets given context to read-only mode.
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func storageContextAsReadOnly(ic *interop.Context) error {
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stcInterface := ic.VM.Estack().Pop().Value()
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stc, ok := stcInterface.(*StorageContext)
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if !ok {
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return fmt.Errorf("%T is not a StorageContext", stcInterface)
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}
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if !stc.ReadOnly {
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stx := &StorageContext{
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ID: stc.ID,
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ReadOnly: true,
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}
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stc = stx
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}
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ic.VM.Estack().PushVal(stackitem.NewInterop(stc))
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return nil
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}
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// contractIsStandard checks if contract is standard (sig or multisig) contract.
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func contractIsStandard(ic *interop.Context) error {
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h := ic.VM.Estack().Pop().Bytes()
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u, err := util.Uint160DecodeBytesBE(h)
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if err != nil {
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return err
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}
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var result bool
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cs, _ := ic.GetContract(u)
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if cs != nil {
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result = vm.IsStandardContract(cs.NEF.Script)
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} else {
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if tx, ok := ic.Container.(*transaction.Transaction); ok {
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for _, witness := range tx.Scripts {
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if witness.ScriptHash() == u {
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result = vm.IsStandardContract(witness.VerificationScript)
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break
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}
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}
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}
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}
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ic.VM.Estack().PushVal(result)
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return nil
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}
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// contractCreateMultisigAccount calculates multisig contract scripthash for a
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// given m and a set of public keys.
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func contractCreateMultisigAccount(ic *interop.Context) error {
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m := ic.VM.Estack().Pop().BigInt()
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if !m.IsInt64() || m.Int64() > math.MaxInt32 {
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return errors.New("m should fit int32")
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}
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arr := ic.VM.Estack().Pop().Array()
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pubs := make(keys.PublicKeys, len(arr))
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for i, pk := range arr {
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p, err := keys.NewPublicKeyFromBytes(pk.Value().([]byte), elliptic.P256())
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if err != nil {
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return err
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}
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pubs[i] = p
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}
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script, err := smartcontract.CreateMultiSigRedeemScript(int(m.Int64()), pubs)
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if err != nil {
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return err
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}
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ic.VM.Estack().PushVal(hash.Hash160(script).BytesBE())
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return nil
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}
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// contractCreateStandardAccount calculates contract scripthash for a given public key.
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func contractCreateStandardAccount(ic *interop.Context) error {
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h := ic.VM.Estack().Pop().Bytes()
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p, err := keys.NewPublicKeyFromBytes(h, elliptic.P256())
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if err != nil {
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return err
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}
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ic.VM.Estack().PushVal(p.GetScriptHash().BytesBE())
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return nil
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}
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// contractGetCallFlags returns current context calling flags.
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func contractGetCallFlags(ic *interop.Context) error {
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ic.VM.Estack().PushVal(ic.VM.Context().GetCallFlags())
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return nil
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}
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