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owner.go
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owner.go
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// Package owner provides method for storing in chaincode state information about chaincode owner
package owner
import (
"github.com/pkg/errors"
"github.com/s7techlab/cckit/identity"
r "github.com/s7techlab/cckit/router"
)
// OwnerStateKey key used to store owner grant struct in chain code state
const OwnerStateKey = `OWNER`
var (
// ErrOwnerNotProvided
ErrOwnerNotProvided = errors.New(`owner not provided`)
// ErrOwnerAlreadySetted owner already setted
ErrOwnerAlreadySetted = errors.New(`owner already setted`)
)
func IsSetted(c r.Context) (bool, error) {
return c.State().Exists(OwnerStateKey)
}
func Get(c r.Context) (*identity.Entry, error) {
ownerEntry, err := c.State().Get(OwnerStateKey, &identity.Entry{})
if err != nil {
return nil, err
}
o := ownerEntry.(identity.Entry)
return &o, nil
}
// SetFromCreator sets chain code owner from stub creator
func SetFromCreator(c r.Context) (*identity.Entry, error) {
if ownerSetted, err := IsSetted(c); err != nil {
return nil, err
} else if ownerSetted {
return Get(c)
}
creator, err := identity.FromStub(c.Stub())
if err != nil {
return nil, err
}
identityEntry, err := identity.CreateEntry(creator)
if err != nil {
return nil, err
}
return identityEntry, c.State().Insert(OwnerStateKey, identityEntry)
}
// SetFromArgs set owner fron first args
func SetFromArgs(c r.Context) (*identity.Entry, error) {
args := c.Stub().GetArgs()
if len(args) == 2 {
return Insert(c, string(args[0]), args[1])
}
if isSetted, err := IsSetted(c); err != nil {
return nil, err
} else if !isSetted {
return nil, ErrOwnerNotProvided
}
return Get(c)
}
// Insert
func Insert(c r.Context, mspID string, cert []byte) (*identity.Entry, error) {
if ownerSetted, err := IsSetted(c); err != nil {
return nil, errors.Wrap(err, `check owner is set`)
} else if ownerSetted {
return nil, ErrOwnerAlreadySetted
}
id, err := identity.New(mspID, cert)
if err != nil {
return nil, err
}
identityEntry, err := identity.CreateEntry(id)
if err != nil {
return nil, errors.Wrap(err, `create owner entry`)
}
return identityEntry, c.State().Insert(OwnerStateKey, identityEntry)
}
// IsInvokerOr checks tx creator and compares with owner of another identity
func IsInvokerOr(c r.Context, allowedTo ...identity.Identity) (bool, error) {
if isOwner, err := IsInvoker(c); isOwner || err != nil {
return isOwner, err
}
if len(allowedTo) == 0 {
return false, nil
}
invoker, err := identity.FromStub(c.Stub())
if err != nil {
return false, err
}
for _, allowed := range allowedTo {
if allowed.Is(invoker) {
return true, nil
}
}
return false, nil
}
// IdentityFromState
func IdentityEntryFromState(c r.Context) (interface{}, error) {
return c.State().Get(OwnerStateKey, &identity.Entry{})
}
// IsInvoker checks than tx creator is chain code owner
func IsInvoker(c r.Context) (bool, error) {
invoker, err := identity.FromStub(c.Stub())
if err != nil {
return false, err
}
owner, err := IdentityEntryFromState(c)
if err != nil {
return false, err
}
return invoker.Is(owner.(identity.Entry)), nil
}