feat(flagd): add support for GCS (#765)

Signed-off-by: Oleg Atamanenko <oleg.atamanenko@gmail.com>

Author: uthark

api/core/v1beta1/common/common.go

@@ -11,6 +11,7 @@ type SyncProviderType string
 const (
 	SyncProviderKubernetes SyncProviderType = "kubernetes"
 	SyncProviderFilepath   SyncProviderType = "file"
+	SyncProviderGcs        SyncProviderType = "gcs"
 	SyncProviderHttp       SyncProviderType = "http"
 	SyncProviderGrpc       SyncProviderType = "grpc"
 	SyncProviderFlagdProxy SyncProviderType = "flagd-proxy"
@@ -57,6 +58,10 @@ func (s SyncProviderType) IsHttp() bool {
 	return s == SyncProviderHttp
 }
 
+func (s SyncProviderType) IsGcs() bool {
+	return s == SyncProviderGcs
+}
+
 func (s SyncProviderType) IsFilepath() bool {
 	return s == SyncProviderFilepath
 }

api/core/v1beta1/common/common_test.go

@@ -12,16 +12,19 @@ func Test_FeatureFlagSource_SyncProvider(t *testing.T) {
 	f := SyncProviderFilepath
 	h := SyncProviderHttp
 	g := SyncProviderGrpc
+	gcs := SyncProviderGcs
 
 	require.True(t, k.IsKubernetes())
 	require.True(t, f.IsFilepath())
 	require.True(t, h.IsHttp())
 	require.True(t, g.IsGrpc())
+	require.True(t, gcs.IsGcs())
 
 	require.False(t, f.IsKubernetes())
 	require.False(t, h.IsFilepath())
 	require.False(t, k.IsGrpc())
 	require.False(t, g.IsHttp())
+	require.False(t, g.IsGcs())
 }
 
 func Test_FLagSourceConfiguration_EnvVarKey(t *testing.T) {

internal/common/flagdinjector/flagdinjector.go

@@ -230,6 +230,8 @@ func (fi *FlagdContainerInjector) newSourceConfig(ctx context.Context, source ap
 		sourceCfg, err = fi.toFilepathProviderConfig(ctx, objectMeta, podSpec, sidecar, source)
 	case source.Provider.IsHttp():
 		sourceCfg = fi.toHttpProviderConfig(source)
+	case source.Provider.IsGcs():
+		sourceCfg = fi.toGcsConfig(source)
 	case source.Provider.IsGrpc():
 		sourceCfg = fi.toGrpcProviderConfig(source)
 	case source.Provider.IsFlagdProxy():
@@ -306,6 +308,14 @@ func (fi *FlagdContainerInjector) toHttpProviderConfig(source api.Source) types.
 	}
 }
 
+func (fi *FlagdContainerInjector) toGcsConfig(source api.Source) types.SourceConfig {
+	return types.SourceConfig{
+		URI:      source.Source,
+		Provider: string(apicommon.SyncProviderGcs),
+		Interval: source.Interval,
+	}
+}
+
 func (fi *FlagdContainerInjector) toGrpcProviderConfig(source api.Source) types.SourceConfig {
 	return types.SourceConfig{
 		URI:        source.Source,