forked from TrueCloudLab/neoneo-go
60 lines
1.6 KiB
Go
60 lines
1.6 KiB
Go
package callback
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import (
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"errors"
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"strings"
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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/state"
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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"
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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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// MethodCallback represents callback for contract method.
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type MethodCallback struct {
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contract *state.Contract
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method *manifest.Method
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}
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var _ Callback = (*MethodCallback)(nil)
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// ArgCount implements Callback interface.
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func (s *MethodCallback) ArgCount() int {
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return len(s.method.Parameters)
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}
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// LoadContext implements Callback interface.
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func (s *MethodCallback) LoadContext(v *vm.VM, args []stackitem.Item) {
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v.Estack().PushVal(args)
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v.Estack().PushVal(s.method.Name)
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v.Estack().PushVal(s.contract.Hash.BytesBE())
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}
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// CreateFromMethod creates callback for a contract method.
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func CreateFromMethod(ic *interop.Context) error {
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rawHash := ic.VM.Estack().Pop().Bytes()
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h, err := util.Uint160DecodeBytesBE(rawHash)
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if err != nil {
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return err
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}
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cs, err := ic.DAO.GetContractState(h)
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if err != nil {
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return errors.New("contract not found")
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}
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method := string(ic.VM.Estack().Pop().Bytes())
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if strings.HasPrefix(method, "_") {
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return errors.New("invalid method name")
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}
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currCs, err := ic.DAO.GetContractState(ic.VM.GetCurrentScriptHash())
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if err == nil && !currCs.Manifest.CanCall(h, &cs.Manifest, method) {
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return errors.New("method call is not allowed")
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}
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md := cs.Manifest.ABI.GetMethod(method)
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ic.VM.Estack().PushVal(stackitem.NewInterop(&MethodCallback{
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contract: cs,
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method: md,
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}))
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return nil
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}
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