CHANGELOG.md

@@ -21,6 +21,7 @@ This document outlines major changes between releases.
 - Add `namespace` label to billing metrics (#271)
 - Support policy-engine (#257)
 - Support `policy` contract (#259)
+- Support `proxy` contract (#287)
 
 ### Changed
 - Generalise config param `use_default_xmlns_for_complete_multipart` to `use_default_xmlns` so that use default xmlns for all requests (#221)

cmd/s3-gw/app.go

@@ -440,6 +440,7 @@ func (a *App) initFrostfsID(ctx context.Context) {
 	a.frostfsid, err = frostfsid.New(ctx, frostfsid.Config{
 		RPCAddress:    a.cfg.GetString(cfgRPCEndpoint),
 		Contract:      a.cfg.GetString(cfgFrostfsIDContract),
+		ProxyContract: a.cfg.GetString(cfgProxyContract),
 		Key:           a.key,
 	})
 	if err != nil {
@@ -457,6 +458,7 @@ func (a *App) initPolicyStorage(ctx context.Context) {
 		policyContract, err = contract.New(ctx, contract.Config{
 			RPCAddress:    a.cfg.GetString(cfgRPCEndpoint),
 			Contract:      a.cfg.GetString(cfgPolicyContract),
+			ProxyContract: a.cfg.GetString(cfgProxyContract),
 			Key:           a.key,
 		})
 		if err != nil {

cmd/s3-gw/app_settings.go

@@ -213,6 +213,9 @@ const ( // Settings.
 	cfgPolicyEnabled  = "policy.enabled"
 	cfgPolicyContract = "policy.contract"
 
+	// Proxy.
+	cfgProxyContract = "proxy.contract"
+
 	// envPrefix is an environment variables prefix used for configuration.
 	envPrefix = "S3_GW"
 )
@@ -702,6 +705,9 @@ func newSettings() *viper.Viper {
 	v.SetDefault(cfgPolicyContract, "policy.frostfs")
 	v.SetDefault(cfgPolicyEnabled, true)
 
+	// proxy
+	v.SetDefault(cfgProxyContract, "proxy.frostfs")
+
 	// resolve
 	v.SetDefault(cfgResolveNamespaceHeader, defaultNamespaceHeader)
 

config/config.env

@@ -204,6 +204,10 @@ S3_GW_POLICY_ENABLED=true
 # Policy contract hash (LE) or name in NNS.
 S3_GW_POLICY_CONTRACT=policy.frostfs
 
+# Proxy contract configuration. To enable this functionality the `rpc_endpoint` param must be also set.
+# Proxy contract hash (LE) or name in NNS.
+S3_GW_PROXY_CONTRACT=proxy.frostfs
+
 # Namespaces configuration
 S3_GW_NAMESPACES_CONFIG=namespaces.json
 

config/config.yaml

@@ -241,5 +241,10 @@ policy:
   # Policy contract hash (LE) or name in NNS.
   contract: policy.frostfs
 
+# Proxy contract configuration. To enable this functionality the `rpc_endpoint` param must be also set.
+proxy:
+  # Proxy contract hash (LE) or name in NNS.
+  contract: proxy.frostfs
+
 namespaces:
   config: namespaces.json

docs/configuration.md

@@ -191,6 +191,7 @@ There are some custom types used for brevity:
 | `web`              | [Web server configuration](#web-section)                       |
 | `frostfsid`        | [FrostfsID configuration](#frostfsid-section)                  |
 | `policy`           | [Policy contract configuration](#policy-section)               |
+| `proxy`            | [Proxy contract configuration](#proxy-section)                 |
 | `namespaces`       | [Namespaces configuration](#namespaces-section)                |
 
 ### General section
@@ -662,6 +663,19 @@ policy:
 | `enabled`  | `bool`   | no            | true           | Enables using policies from Policy contract to check permissions. |
 | `contract` | `string` | no            | policy.frostfs | Policy contract hash (LE) or name in NNS.                         |
 
+# `proxy` section
+
+Proxy contract configuration. To enable this functionality the `rpc_endpoint` param must be also set.
+
+```yaml
+proxy:
+  contract: proxy.frostfs
+```
+
+| Parameter  | Type     | SIGHUP reload | Default value   | Description                              |
+|------------|----------|---------------|-----------------|------------------------------------------|
+| `contract` | `string` | no            | `proxy.frostfs` | Proxy contract hash (LE) or name in NNS. |
+
 # `namespaces` section
 
 Namespaces configuration.

internal/frostfs/policy/contract/contract.go

@@ -9,9 +9,11 @@ import (
 	policyclient "git.frostfs.info/TrueCloudLab/frostfs-contract/rpcclient/policy"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/internal/frostfs/policy"
 	frostfsutil "git.frostfs.info/TrueCloudLab/frostfs-s3-gw/internal/frostfs/util"
+	"github.com/nspcc-dev/neo-go/pkg/core/transaction"
 	"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
 	"github.com/nspcc-dev/neo-go/pkg/rpcclient"
 	"github.com/nspcc-dev/neo-go/pkg/rpcclient/actor"
+	"github.com/nspcc-dev/neo-go/pkg/rpcclient/notary"
 	"github.com/nspcc-dev/neo-go/pkg/util"
 	"github.com/nspcc-dev/neo-go/pkg/wallet"
 )
@@ -28,6 +30,9 @@ type Config struct {
 	// Contract is hash of contract or its name in NNS.
 	Contract string
 
+	// ProxyContract is hash of proxy contract or its name in NNS to interact with policy.
+	ProxyContract string
+
 	// Key is used to interact with policy contract.
 	// If this is nil than random key will be generated.
 	Key *keys.PrivateKey
@@ -54,8 +59,12 @@ func New(ctx context.Context, cfg Config) (*Client, error) {
 		return nil, fmt.Errorf("create policy rpc client: %w", err)
 	}
 
-	acc := wallet.NewAccountFromPrivateKey(key)
+	proxyContractHash, err := frostfsutil.ResolveContractHash(cfg.ProxyContract, cfg.RPCAddress)
-	act, err := actor.NewSimple(rpcCli, acc)
+	if err != nil {
+		return nil, fmt.Errorf("resolve frostfs contract hash: %w", err)
+	}
+
+	act, err := actor.New(rpcCli, getSigners(key, proxyContractHash, contractHash))
 	if err != nil {
 		return nil, fmt.Errorf("create new actor: %w", err)
 	}
@@ -66,6 +75,28 @@ func New(ctx context.Context, cfg Config) (*Client, error) {
 	}, nil
 }
 
+func getSigners(key *keys.PrivateKey, proxyHash, contractHash util.Uint160) []actor.SignerAccount {
+	acc := wallet.NewAccountFromPrivateKey(key)
+
+	return []actor.SignerAccount{
+		{
+			Signer: transaction.Signer{
+				Account:          proxyHash,
+				Scopes:           transaction.CustomContracts,
+				AllowedContracts: []util.Uint160{contractHash},
+			},
+			Account: notary.FakeContractAccount(proxyHash),
+		},
+		{
+			Signer: transaction.Signer{
+				Account: acc.Contract.ScriptHash(),
+				Scopes:  transaction.CalledByEntry,
+			},
+			Account: acc,
+		},
+	}
+}
+
 func (c *Client) AddChain(kind policycontract.Kind, entity string, name []byte, chain []byte) (util.Uint256, uint32, error) {
 	return c.policyContract.AddChain(big.NewInt(int64(kind)), entity, name, chain)
 }