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