frostfs-node/pkg/morph/client/container/eacl.go

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package container
import (
"crypto/sha256"
"fmt"
"git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/refs"
"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/core/container"
"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/morph/client"
apistatus "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/client/status"
cid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/container/id"
"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/eacl"
"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/session"
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)
// GetEACL reads the extended ACL table from FrostFS system
// through Container contract call.
//
// Returns apistatus.EACLNotFound if eACL table is missing in the contract.
func (c *Client) GetEACL(cnr cid.ID) (*container.EACL, error) {
binCnr := make([]byte, sha256.Size)
cnr.Encode(binCnr)
prm := client.TestInvokePrm{}
prm.SetMethod(eaclMethod)
prm.SetArgs(binCnr)
prms, err := c.client.TestInvoke(prm)
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if err != nil {
return nil, fmt.Errorf("could not perform test invocation (%s): %w", eaclMethod, err)
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} else if ln := len(prms); ln != 1 {
return nil, fmt.Errorf("unexpected stack item count (%s): %d", eaclMethod, ln)
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}
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])
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if err != nil {
return nil, fmt.Errorf("could not get byte array of eACL signature (%s): %w", eaclMethod, err)
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}
// 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 {
var errEACLNotFound apistatus.EACLNotFound
return nil, 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)
}
var res container.EACL
res.Value = eacl.NewTable()
if err = res.Value.Unmarshal(rawEACL); err != nil {
return nil, err
}
if len(binToken) > 0 {
res.Session = new(session.Container)
err = res.Session.Unmarshal(binToken)
if err != nil {
return nil, fmt.Errorf("could not unmarshal session token: %w", err)
}
}
// TODO(@cthulhu-rider): #1387 implement and use another approach to avoid conversion
var sigV2 refs.Signature
sigV2.SetKey(pub)
sigV2.SetSign(sig)
sigV2.SetScheme(refs.ECDSA_RFC6979_SHA256)
err = res.Signature.ReadFromV2(sigV2)
return &res, err
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}