common

type AdapterOptions struct {
	RequiredMeta       RequiredMetadata
	AttachMetaToResult bool
}

type MetadataExtractor interface {
	// Get returns the value for the given key and whether it was found.
	Get(key string) (string, bool)
	// All returns all metadata key-value pairs.
	All() map[string]string
}

type RequiredMetadata struct {
	// Keys lists required metadata/header names.
	// For HTTP headers, comparison is case-insensitive.
	// For gRPC metadata, keys are treated as lower-case per gRPC conventions.
	Keys []string

	// Enabled controls whether metadata validation is active.
	// If false, Validate always returns nil.
	Enabled bool
}