// kmsKeyIDFromMetadata returns any AWS S3 KMS key ID in the
// metadata, if any. It returns an empty ID if no key ID is
// present.
func kmsKeyIDFromMetadata(metadata map[string]string) string {
	const ARNPrefix = crypto.ARNPrefix
	if len(metadata) == 0 {
		return ""
	}
	kmsID, ok := metadata[crypto.MetaKeyID]
	if !ok {
		return ""
	}
	if strings.HasPrefix(kmsID, ARNPrefix) {
		return kmsID

        JApiMethod method = (JApiMethod) member

        def metadata = KotlinMetadataQueries.INSTANCE

        def oldMethod = method.oldMethod.get()
        def newMethod = method.newMethod.get()

        def oldIsOperator = metadata.isKotlinOperatorFunction(oldMethod)
        def newIsOperator = metadata.isKotlinOperatorFunction(newMethod)

        def oldIsInfix = metadata.isKotlinInfixFunction(oldMethod)

import org.apache.maven.artifact.metadata.ArtifactMetadataRetrievalException;
import org.apache.maven.artifact.metadata.ArtifactMetadataSource;
import org.apache.maven.artifact.metadata.ResolutionGroup;
import org.apache.maven.artifact.repository.ArtifactRepository;
import org.apache.maven.artifact.repository.metadata.ArtifactRepositoryMetadata;
import org.apache.maven.artifact.repository.metadata.Metadata;

    <artifactId>maven-api</artifactId>
    <version>4.0.0-beta-6-SNAPSHOT</version>
  </parent>

  <artifactId>maven-api-metadata</artifactId>

  <name>Maven 4 API :: Repository Metadata</name>
  <description>Maven 4 API - Immutable Repository Metadata model.</description>

  <dependencies>
    <dependency>
      <groupId>org.apache.maven</groupId>
      <artifactId>maven-api-meta</artifactId>

func TestGetObjectRetentionMeta(t *testing.T) {
	tests := []struct {
		metadata map[string]string
		expected ObjectRetention
	}{
		{
			metadata: map[string]string{
				"Authorization":        "AWS4-HMAC-SHA256 <cred_string>",
				"X-Amz-Content-Sha256": "",
				"Content-Encoding":     "",
			},
			expected: ObjectRetention{},
		},
		{
			metadata: map[string]string{
				"x-amz-object-lock-mode": "governance",
			},

### Internal metadata for replication

`xl.meta` that is in use for [versioning](https://github.com/minio/minio/blob/master/docs/bucket/versioning/DESIGN.md) has additional metadata for replication of objects,delete markers and versioned deletes.

// get ObjectOptions for PUT calls from encryption headers and metadata
func putOptsFromReq(ctx context.Context, r *http.Request, bucket, object string, metadata map[string]string) (opts ObjectOptions, err error) {
	return putOpts(ctx, bucket, object, r.Form.Get(xhttp.VersionID), r.Header, metadata)
}

func putOpts(ctx context.Context, bucket, object, vid string, hdrs http.Header, metadata map[string]string) (opts ObjectOptions, err error) {

message ResourceClaimTemplateList {
  // Standard list metadata
  // +optional
  optional k8s.io.apimachinery.pkg.apis.meta.v1.ListMeta metadata = 1;

  // Items is the list of resource claim templates.
  repeated ResourceClaimTemplate items = 2;
}

// ResourceClaimTemplateSpec contains the metadata and fields for a ResourceClaim.
message ResourceClaimTemplateSpec {

  optional k8s.io.apimachinery.pkg.apis.meta.v1.ObjectMeta metadata = 1;

  // spec represents the specification of the CSI Driver.
  optional CSIDriverSpec spec = 2;
}

// CSIDriverList is a collection of CSIDriver objects.
message CSIDriverList {
  // Standard list metadata

	UserMetadata map[string]string `json:"userMetadata,omitempty"`
	VersionID    string            `json:"versionId,omitempty"`
	Sequencer    string            `json:"sequencer"`
}

// Metadata represents event metadata.
type Metadata struct {
	SchemaVersion   string `json:"s3SchemaVersion"`
	ConfigurationID string `json:"configurationId"`
	Bucket          Bucket `json:"bucket"`
	Object          Object `json:"object"`
}