Add api to set object lock config on a bucket (#463)

Author: cesnietor

models/object_retention_unit.go

@@ -68,6 +68,7 @@ type MinioClient interface {
 	getBucketEncryption(ctx context.Context, bucketName string) (*sse.Configuration, error)
 	putObjectTagging(ctx context.Context, bucketName, objectName string, otags *tags.Tags, opts minio.PutObjectTaggingOptions) error
 	getObjectTagging(ctx context.Context, bucketName, objectName string, opts minio.GetObjectTaggingOptions) (*tags.Tags, error)
+	setObjectLockConfig(ctx context.Context, bucketName string, mode *minio.RetentionMode, validity *uint, unit *minio.ValidityUnit) error
 }
 
 // Interface implementation
@@ -169,6 +170,10 @@ func (c minioClient) getObjectTagging(ctx context.Context, bucketName, objectNam
 	return c.client.GetObjectTagging(ctx, bucketName, objectName, opts)
 }
 
+func (c minioClient) setObjectLockConfig(ctx context.Context, bucketName string, mode *minio.RetentionMode, validity *uint, unit *minio.ValidityUnit) error {
+	return c.client.SetObjectLockConfig(ctx, bucketName, mode, validity, unit)
+}
+
 // MCClient interface with all functions to be implemented
 // by mock when testing, it should include all mc/S3Client respective api calls
 // that are used within this project.