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keys.go
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keys.go
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package keeper
import (
"github.com/cosmos/cosmos-sdk/internal/conv"
sdk "github.com/cosmos/cosmos-sdk/types"
"github.com/cosmos/cosmos-sdk/types/address"
"github.com/cosmos/cosmos-sdk/x/authz"
)
// Keys for store prefixes
var (
GrantKey = []byte{0x01} // prefix for each key
)
// StoreKey is the store key string for authz
const StoreKey = authz.ModuleName
// grantStoreKey - return authorization store key
// Items are stored with the following key: values
//
// - 0x01<granterAddressLen (1 Byte)><granterAddress_Bytes><granteeAddressLen (1 Byte)><granteeAddress_Bytes><msgType_Bytes>: Grant
func grantStoreKey(grantee sdk.AccAddress, granter sdk.AccAddress, msgType string) []byte {
m := conv.UnsafeStrToBytes(msgType)
granter = address.MustLengthPrefix(granter)
grantee = address.MustLengthPrefix(grantee)
l := 1 + len(grantee) + len(granter) + len(m)
var key = make([]byte, l)
copy(key, GrantKey)
copy(key[1:], granter)
copy(key[1+len(granter):], grantee)
copy(key[l-len(m):], m)
// fmt.Println(">>>> len", l, key)
return key
}
// addressesFromGrantStoreKey - split granter & grantee address from the authorization key
func addressesFromGrantStoreKey(key []byte) (granterAddr, granteeAddr sdk.AccAddress) {
// key is of format:
// 0x01<granterAddressLen (1 Byte)><granterAddress_Bytes><granteeAddressLen (1 Byte)><granteeAddress_Bytes><msgType_Bytes>
granterAddrLen := key[1] // remove prefix key
granterAddr = sdk.AccAddress(key[2 : 2+granterAddrLen])
granteeAddrLen := int(key[2+granterAddrLen])
granteeAddr = sdk.AccAddress(key[3+granterAddrLen : 3+granterAddrLen+byte(granteeAddrLen)])
return granterAddr, granteeAddr
}