1 files changed, 38 insertions, 0 deletions
diff --git a/internal/featureflag/grpc_header.go b/internal/featureflag/grpc_header.go
new file mode 100644
index 000000000..e71f1cfe9
--- /dev/null
+++ b/internal/featureflag/grpc_header.go
@@ -0,0 +1,38 @@
+package featureflag
+
+import (
+	"context"
+	"fmt"
+
+	"google.golang.org/grpc/metadata"
+)
+
+// IsEnabled checks if the feature flag is enabled for the passed context.
+// Only return true if the metadata for the feature flag is set to "true"
+func IsEnabled(ctx context.Context, flag string) bool {
+	if flag == "" {
+		return false
+	}
+
+	md, ok := metadata.FromIncomingContext(ctx)
+	if !ok {
+		return false
+	}
+
+	val, ok := md[HeaderKey(flag)]
+	if !ok {
+		return false
+	}
+
+	return len(val) > 0 && val[0] == "true"
+}
+
+// IsDisabled is the inverse operation of IsEnabled
+func IsDisabled(ctx context.Context, flag string) bool {
+	return !IsEnabled(ctx, flag)
+}
+
+// HeaderKey returns the feature flag key to be used in the metadata map
+func HeaderKey(flag string) string {
+	return fmt.Sprintf("gitaly-feature-%s", flag)
+}