[#568] Add configuration for region to policy map

Signed-off-by: Denis Kirillov <denis@nspcc.ru>

api/handler/api.go

@@ -24,12 +24,17 @@ type (
 
 	// Config contains data which handler needs to keep.
 	Config struct {
-		DefaultPolicy      netmap.PlacementPolicy
+		Policy             PlacementPolicy
 		DefaultMaxAge      int
 		NotificatorEnabled bool
 		TLSEnabled         bool
 		CopiesNumber       uint32
 	}
+
+	PlacementPolicy struct {
+		Default   netmap.PlacementPolicy
+		RegionMap map[string]netmap.PlacementPolicy
+	}
 )
 
 const (

api/handler/head.go

@@ -123,6 +123,7 @@ func (h *handler) HeadBucketHandler(w http.ResponseWriter, r *http.Request) {
 	}
 
 	w.Header().Set(api.ContainerID, bktInfo.CID.EncodeToString())
+	w.Header().Set(api.AmzBucketRegion, bktInfo.LocationConstraint)
 	api.WriteResponse(w, http.StatusOK, nil, api.MimeNone)
 }
 

api/handler/put.go

@@ -667,12 +667,10 @@ func parseMetadata(r *http.Request) map[string]string {
 }
 
 func (h *handler) CreateBucketHandler(w http.ResponseWriter, r *http.Request) {
-	var (
-		reqInfo = api.GetReqInfo(r.Context())
-		p       = layer.CreateBucketParams{
+	reqInfo := api.GetReqInfo(r.Context())
+	p := &layer.CreateBucketParams{
 		Name: reqInfo.BucketName,
 	}
-	)
 
 	if err := checkBucketName(reqInfo.BucketName); err != nil {
 		h.logAndSendError(w, "invalid bucket name", reqInfo, err)
@@ -722,24 +720,11 @@ func (h *handler) CreateBucketHandler(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	useDefaultPolicy := true
-	if createParams.LocationConstraint != "" {
-		for _, placementPolicy := range policies {
-			if placementPolicy.LocationConstraint == createParams.LocationConstraint {
-				p.Policy = placementPolicy.Policy
-				p.LocationConstraint = createParams.LocationConstraint
-				useDefaultPolicy = false
-				break
-			}
-		}
-	}
-	if useDefaultPolicy {
-		p.Policy = h.cfg.DefaultPolicy
-	}
+	h.setPolicy(p, createParams.LocationConstraint, policies)
 
 	p.ObjectLockEnabled = isLockEnabled(r.Header)
 
-	bktInfo, err := h.obj.CreateBucket(r.Context(), &p)
+	bktInfo, err := h.obj.CreateBucket(r.Context(), p)
 	if err != nil {
 		h.logAndSendError(w, "could not create bucket", reqInfo, err)
 		return
@@ -762,6 +747,27 @@ func (h *handler) CreateBucketHandler(w http.ResponseWriter, r *http.Request) {
 	api.WriteSuccessResponseHeadersOnly(w)
 }
 
+func (h handler) setPolicy(prm *layer.CreateBucketParams, locationConstraint string, userPolicies []*accessbox.ContainerPolicy) {
+	prm.Policy = h.cfg.Policy.Default
+
+	if locationConstraint == "" {
+		return
+	}
+
+	if policy, ok := h.cfg.Policy.RegionMap[locationConstraint]; ok {
+		prm.Policy = policy
+		prm.LocationConstraint = locationConstraint
+	}
+
+	for _, placementPolicy := range userPolicies {
+		if placementPolicy.LocationConstraint == locationConstraint {
+			prm.Policy = placementPolicy.Policy
+			prm.LocationConstraint = locationConstraint
+			return
+		}
+	}
+}
+
 func isLockEnabled(header http.Header) bool {
 	lockEnabledStr := header.Get(api.AmzBucketObjectLockEnabled)
 	lockEnabled, _ := strconv.ParseBool(lockEnabledStr)

cmd/s3-gw/app.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"crypto/tls"
 	"encoding/hex"
+	"encoding/json"
 	"errors"
 	"fmt"
 	"net"
@@ -27,6 +28,7 @@ import (
 	"github.com/nspcc-dev/neofs-s3-gw/internal/neofs"
 	"github.com/nspcc-dev/neofs-s3-gw/internal/version"
 	"github.com/nspcc-dev/neofs-s3-gw/internal/wallet"
+	"github.com/nspcc-dev/neofs-sdk-go/netmap"
 	"github.com/nspcc-dev/neofs-sdk-go/pool"
 	"github.com/spf13/viper"
 	"go.uber.org/zap"
@@ -596,41 +598,83 @@ func getAccessBoxCacheConfig(v *viper.Viper, l *zap.Logger) *cache.Config {
 }
 
 func getHandlerOptions(v *viper.Viper, l *zap.Logger) *handler.Config {
-	var (
-		cfg             handler.Config
-		err             error
-		policyStr       = handler.DefaultPolicy
-		defaultMaxAge   = handler.DefaultMaxAge
-		setCopiesNumber = handler.DefaultCopiesNumber
-	)
-
-	if v.IsSet(cfgDefaultPolicy) {
-		policyStr = v.GetString(cfgDefaultPolicy)
+	cfg := &handler.Config{
+		Policy: handler.PlacementPolicy{
+			RegionMap: make(map[string]netmap.PlacementPolicy),
+		},
+		DefaultMaxAge:      handler.DefaultMaxAge,
+		NotificatorEnabled: v.GetBool(cfgEnableNATS),
+		TLSEnabled:         v.IsSet(cfgTLSKeyFile) && v.IsSet(cfgTLSCertFile),
+		CopiesNumber:       handler.DefaultCopiesNumber,
 	}
 
-	if err = cfg.DefaultPolicy.DecodeString(policyStr); err != nil {
-		l.Fatal("couldn't parse container default policy",
-			zap.Error(err))
+	defaultPolicyStr := handler.DefaultPolicy
+	if v.IsSet(cfgPolicyDefault) {
+		defaultPolicyStr = v.GetString(cfgPolicyDefault)
+	}
+
+	if err := cfg.Policy.Default.DecodeString(defaultPolicyStr); err != nil {
+		l.Fatal("couldn't parse container default policy", zap.Error(err))
+	}
+
+	regionPolicyMap, err := parseRegionMap(v)
+	if err != nil {
+		l.Fatal("couldn't parse region mapping policy file", zap.Error(err))
+	}
+
+	for region, policy := range regionPolicyMap {
+		var pp netmap.PlacementPolicy
+		if err = pp.DecodeString(policy); err == nil {
+			cfg.Policy.RegionMap[region] = pp
+			continue
+		}
+
+		if err = pp.UnmarshalJSON([]byte(policy)); err == nil {
+			cfg.Policy.RegionMap[region] = pp
+			continue
+		}
+
+		l.Fatal("couldn't parse region mapping policy", zap.String("name", region), zap.Error(err))
 	}
 
 	if v.IsSet(cfgDefaultMaxAge) {
-		defaultMaxAge = v.GetInt(cfgDefaultMaxAge)
+		defaultMaxAge := v.GetInt(cfgDefaultMaxAge)
 
 		if defaultMaxAge <= 0 && defaultMaxAge != -1 {
 			l.Fatal("invalid defaultMaxAge",
 				zap.String("parameter", cfgDefaultMaxAge),
 				zap.String("value in config", strconv.Itoa(defaultMaxAge)))
 		}
+		cfg.DefaultMaxAge = defaultMaxAge
 	}
 
 	if val := v.GetUint32(cfgSetCopiesNumber); val > 0 {
-		setCopiesNumber = val
+		cfg.CopiesNumber = val
 	}
 
-	cfg.DefaultMaxAge = defaultMaxAge
-	cfg.NotificatorEnabled = v.GetBool(cfgEnableNATS)
-	cfg.TLSEnabled = v.IsSet(cfgTLSKeyFile) && v.IsSet(cfgTLSCertFile)
-	cfg.CopiesNumber = setCopiesNumber
-
-	return &cfg
+	return cfg
+}
+
+func parseRegionMap(v *viper.Viper) (map[string]string, error) {
+	regionMap := make(map[string]string)
+
+	filePath := v.GetString(cfgPolicyRegionMapFile)
+	if filePath == "" {
+		return regionMap, nil
+	}
+
+	data, err := os.ReadFile(filePath)
+	if err != nil {
+		return nil, fmt.Errorf("coudln't read file '%s'", filePath)
+	}
+
+	if err = json.Unmarshal(data, &regionMap); err != nil {
+		return nil, fmt.Errorf("unmarshal policies: %w", err)
+	}
+
+	if _, ok := regionMap[api.DefaultLocationConstraint]; ok {
+		return nil, fmt.Errorf("config overrides %s location constraint", api.DefaultLocationConstraint)
+	}
+
+	return regionMap, nil
 }

cmd/s3-gw/app_settings.go

@@ -76,7 +76,8 @@ const ( // Settings.
 	cfgNATSRootCAFiles        = "nats.root_ca"
 
 	// Policy.
-	cfgDefaultPolicy = "default_policy"
+	cfgPolicyDefault       = "placement_policy.default"
+	cfgPolicyRegionMapFile = "placement_policy.region_mapping"
 
 	// CORS.
 	cfgDefaultMaxAge = "cors.default_max_age"