package container import ( "crypto/sha256" "fmt" "github.com/nspcc-dev/neofs-node/pkg/core/container" "github.com/nspcc-dev/neofs-node/pkg/morph/client" cid "github.com/nspcc-dev/neofs-sdk-go/container/id" "github.com/nspcc-dev/neofs-sdk-go/eacl" "github.com/nspcc-dev/neofs-sdk-go/session" "github.com/nspcc-dev/neofs-sdk-go/signature" ) // GetEACL reads the extended ACL table from NeoFS system // through Container contract call. func (c *Client) GetEACL(cnr *cid.ID) (*eacl.Table, error) { if cnr == nil { return nil, errNilArgument } binCnr := make([]byte, sha256.Size) cnr.Encode(binCnr) prm := client.TestInvokePrm{} prm.SetMethod(eaclMethod) prm.SetArgs(binCnr) prms, err := c.client.TestInvoke(prm) if err != nil { return nil, fmt.Errorf("could not perform test invocation (%s): %w", eaclMethod, err) } else if ln := len(prms); ln != 1 { return nil, fmt.Errorf("unexpected stack item count (%s): %d", eaclMethod, ln) } arr, err := client.ArrayFromStackItem(prms[0]) if err != nil { return nil, fmt.Errorf("could not get item array of eACL (%s): %w", eaclMethod, err) } if len(arr) != 4 { return nil, fmt.Errorf("unexpected eacl stack item count (%s): %d", eaclMethod, len(arr)) } rawEACL, err := client.BytesFromStackItem(arr[0]) if err != nil { return nil, fmt.Errorf("could not get byte array of eACL (%s): %w", eaclMethod, err) } sig, err := client.BytesFromStackItem(arr[1]) if err != nil { return nil, fmt.Errorf("could not get byte array of eACL signature (%s): %w", eaclMethod, err) } // Client may not return errors if the table is missing, so check this case additionally. // The absence of a signature in the response can be taken as an eACL absence criterion, // since unsigned table cannot be approved in the storage by design. if len(sig) == 0 { return nil, container.ErrEACLNotFound } pub, err := client.BytesFromStackItem(arr[2]) if err != nil { return nil, fmt.Errorf("could not get byte array of eACL public key (%s): %w", eaclMethod, err) } binToken, err := client.BytesFromStackItem(arr[3]) if err != nil { return nil, fmt.Errorf("could not get byte array of eACL session token (%s): %w", eaclMethod, err) } table := eacl.NewTable() if err = table.Unmarshal(rawEACL); err != nil { // use other major version if there any return nil, err } if len(binToken) > 0 { tok := session.NewToken() err = tok.Unmarshal(binToken) if err != nil { return nil, fmt.Errorf("could not unmarshal session token: %w", err) } table.SetSessionToken(tok) } tableSignature := signature.New() tableSignature.SetKey(pub) tableSignature.SetSign(sig) table.SetSignature(tableSignature) return table, nil }