[#212] Support CORS container for CORS settings

Signed-off-by: Marina Biryukova <m.biryukova@yadro.com>

cmd/http-gw/settings.go

@@ -16,6 +16,7 @@ import (
 	"time"
 
 	"git.frostfs.info/TrueCloudLab/frostfs-http-gw/internal/cache"
+	"git.frostfs.info/TrueCloudLab/frostfs-http-gw/internal/data"
 	"git.frostfs.info/TrueCloudLab/frostfs-http-gw/internal/logs"
 	internalnet "git.frostfs.info/TrueCloudLab/frostfs-http-gw/internal/net"
 	"git.frostfs.info/TrueCloudLab/frostfs-http-gw/internal/service/frostfs"
@@ -155,18 +156,21 @@ const (
 	cfgBucketsCacheLifetime = "cache.buckets.lifetime"
 	cfgBucketsCacheSize     = "cache.buckets.size"
 	cfgNetmapCacheLifetime  = "cache.netmap.lifetime"
+	cfgCORSCacheLifetime    = "cache.cors.lifetime"
+	cfgCORSCacheSize        = "cache.cors.size"
 
 	// Bucket resolving options.
 	cfgResolveNamespaceHeader   = "resolve_bucket.namespace_header"
 	cfgResolveDefaultNamespaces = "resolve_bucket.default_namespaces"
 
 	// CORS.
-	cfgCORSAllowOrigin      = "cors.allow_origin"
-	cfgCORSAllowMethods     = "cors.allow_methods"
-	cfgCORSAllowHeaders     = "cors.allow_headers"
-	cfgCORSExposeHeaders    = "cors.expose_headers"
-	cfgCORSAllowCredentials = "cors.allow_credentials"
-	cfgCORSMaxAge           = "cors.max_age"
+	cfgCORS                 = "cors"
+	cfgCORSAllowOrigin      = cfgCORS + ".allow_origin"
+	cfgCORSAllowMethods     = cfgCORS + ".allow_methods"
+	cfgCORSAllowHeaders     = cfgCORS + ".allow_headers"
+	cfgCORSExposeHeaders    = cfgCORS + ".expose_headers"
+	cfgCORSAllowCredentials = cfgCORS + ".allow_credentials"
+	cfgCORSMaxAge           = cfgCORS + ".max_age"
 
 	// Multinet.
 	cfgMultinetEnabled       = "multinet.enabled"
@@ -179,6 +183,9 @@ const (
 	cfgFeaturesEnableFilepathFallback = "features.enable_filepath_fallback"
 	cfgFeaturesTreePoolNetmapSupport  = "features.tree_pool_netmap_support"
 
+	// Containers.
+	cfgContainersCORS = "containers.cors"
+
 	// Command line args.
 	cmdHelp          = "help"
 	cmdVersion       = "version"
@@ -759,6 +766,15 @@ func getNetmapCacheOptions(v *viper.Viper, l *zap.Logger) *cache.NetmapCacheConf
 	return cacheCfg
 }
 
+func getCORSCacheOptions(v *viper.Viper, l *zap.Logger) *cache.Config {
+	cacheCfg := cache.DefaultCORSConfig(l)
+
+	cacheCfg.Lifetime = fetchCacheLifetime(v, l, cfgCORSCacheLifetime, cacheCfg.Lifetime)
+	cacheCfg.Size = fetchCacheSize(v, l, cfgCORSCacheSize, cacheCfg.Size)
+
+	return cacheCfg
+}
+
 func fetchCacheLifetime(v *viper.Viper, l *zap.Logger, cfgEntry string, defaultValue time.Duration) time.Duration {
 	if v.IsSet(cfgEntry) {
 		lifetime := v.GetDuration(cfgEntry)
@@ -854,3 +870,18 @@ func fetchArchiveCompression(v *viper.Viper) bool {
 	}
 	return v.GetBool(cfgArchiveCompression)
 }
+
+func fetchCORSConfig(v *viper.Viper) *data.CORSRule {
+	if !v.IsSet(cfgCORS) {
+		return nil
+	}
+
+	return &data.CORSRule{
+		AllowedOrigins:     []string{v.GetString(cfgCORSAllowOrigin)},
+		AllowedMethods:     v.GetStringSlice(cfgCORSAllowMethods),
+		AllowedHeaders:     v.GetStringSlice(cfgCORSAllowHeaders),
+		ExposeHeaders:      v.GetStringSlice(cfgCORSExposeHeaders),
+		AllowedCredentials: v.GetBool(cfgCORSAllowCredentials),
+		MaxAgeSeconds:      fetchCORSMaxAge(v),
+	}
+}