neoneo-go/pkg/smartcontract/manifest/manifest.go

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package manifest
import (
"encoding/json"
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"github.com/nspcc-dev/neo-go/pkg/io"
"github.com/nspcc-dev/neo-go/pkg/smartcontract"
"github.com/nspcc-dev/neo-go/pkg/util"
)
const (
// MaxManifestSize is a max length for a valid contract manifest.
MaxManifestSize = 2048
// MethodInit is a name for default initialization method.
MethodInit = "_initialize"
// MethodVerify is a name for default verification method.
MethodVerify = "verify"
// NEP5StandardName represents the name of NEP5 smartcontract standard.
NEP5StandardName = "NEP-5"
// NEP10StandardName represents the name of NEP10 smartcontract standard.
NEP10StandardName = "NEP-10"
)
// ABI represents a contract application binary interface.
type ABI struct {
Hash util.Uint160 `json:"hash"`
Methods []Method `json:"methods"`
Events []Event `json:"events"`
}
// Manifest represens contract metadata.
type Manifest struct {
// ABI is a contract's ABI.
ABI ABI
// Groups is a set of groups to which a contract belongs.
Groups []Group
// Features is a set of contract's features.
Features smartcontract.PropertyState
Permissions []Permission
// SupportedStandards is a list of standards supported by the contract.
SupportedStandards []string
// Trusts is a set of hashes to a which contract trusts.
Trusts WildUint160s
// SafeMethods is a set of names of safe methods.
SafeMethods WildStrings
// Extra is an implementation-defined user data.
Extra interface{}
}
type manifestAux struct {
ABI *ABI `json:"abi"`
Groups []Group `json:"groups"`
Features map[string]bool `json:"features"`
Permissions []Permission `json:"permissions"`
SupportedStandards []string `json:"supportedstandards"`
Trusts *WildUint160s `json:"trusts"`
SafeMethods *WildStrings `json:"safemethods"`
Extra interface{} `json:"extra"`
}
// NewManifest returns new manifest with necessary fields initialized.
func NewManifest(h util.Uint160) *Manifest {
m := &Manifest{
ABI: ABI{
Hash: h,
Methods: []Method{},
Events: []Event{},
},
Groups: []Group{},
Features: smartcontract.NoProperties,
SupportedStandards: []string{},
}
m.Trusts.Restrict()
m.SafeMethods.Restrict()
return m
}
// DefaultManifest returns default contract manifest.
func DefaultManifest(h util.Uint160) *Manifest {
m := NewManifest(h)
m.Permissions = []Permission{*NewPermission(PermissionWildcard)}
return m
}
// GetMethod returns methods with the specified name.
func (a *ABI) GetMethod(name string) *Method {
for i := range a.Methods {
if a.Methods[i].Name == name {
return &a.Methods[i]
}
}
return nil
}
// CanCall returns true is current contract is allowed to call
// method of another contract.
func (m *Manifest) CanCall(toCall *Manifest, method string) bool {
// this if is not present in the original code but should probably be here
if toCall.SafeMethods.Contains(method) {
return true
}
for i := range m.Permissions {
if m.Permissions[i].IsAllowed(toCall, method) {
return true
}
}
return false
}
// IsValid checks whether the given hash is the one specified in manifest and
// verifies it against all the keys in manifest groups.
func (m *Manifest) IsValid(hash util.Uint160) bool {
if m.ABI.Hash != hash {
return false
}
for _, g := range m.Groups {
if !g.IsValid(hash) {
return false
}
}
return true
}
// MarshalJSON implements json.Marshaler interface.
func (m *Manifest) MarshalJSON() ([]byte, error) {
features := make(map[string]bool)
features["storage"] = m.Features&smartcontract.HasStorage != 0
features["payable"] = m.Features&smartcontract.IsPayable != 0
aux := &manifestAux{
ABI: &m.ABI,
Groups: m.Groups,
Features: features,
Permissions: m.Permissions,
SupportedStandards: m.SupportedStandards,
Trusts: &m.Trusts,
SafeMethods: &m.SafeMethods,
Extra: m.Extra,
}
return json.Marshal(aux)
}
// UnmarshalJSON implements json.Unmarshaler interface.
func (m *Manifest) UnmarshalJSON(data []byte) error {
aux := &manifestAux{
ABI: &m.ABI,
Trusts: &m.Trusts,
SafeMethods: &m.SafeMethods,
}
if err := json.Unmarshal(data, aux); err != nil {
return err
}
if aux.Features["storage"] {
m.Features |= smartcontract.HasStorage
}
if aux.Features["payable"] {
m.Features |= smartcontract.IsPayable
}
m.Groups = aux.Groups
m.Permissions = aux.Permissions
m.SupportedStandards = aux.SupportedStandards
m.Extra = aux.Extra
return nil
}
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// EncodeBinary implements io.Serializable.
func (m *Manifest) EncodeBinary(w *io.BinWriter) {
data, err := json.Marshal(m)
if err != nil {
w.Err = err
return
}
w.WriteVarBytes(data)
}
// DecodeBinary implements io.Serializable.
func (m *Manifest) DecodeBinary(r *io.BinReader) {
data := r.ReadVarBytes()
if r.Err != nil {
return
} else if err := json.Unmarshal(data, m); err != nil {
r.Err = err
}
}