add support for AWS AssumeRole with tiering

tier-s3.go

@@ -23,14 +23,17 @@ package madmin
 
 // TierS3 represents the remote tier configuration for AWS S3 compatible backend.
 type TierS3 struct {
-	Endpoint     string `json:",omitempty"`
-	AccessKey    string `json:",omitempty"`
-	SecretKey    string `json:",omitempty"`
-	Bucket       string `json:",omitempty"`
-	Prefix       string `json:",omitempty"`
-	Region       string `json:",omitempty"`
-	StorageClass string `json:",omitempty"`
-	AWSRole      bool   `json:",omitempty"`
+	Endpoint           string `json:",omitempty"`
+	AccessKey          string `json:",omitempty"`
+	SecretKey          string `json:",omitempty"`
+	Bucket             string `json:",omitempty"`
+	Prefix             string `json:",omitempty"`
+	Region             string `json:",omitempty"`
+	StorageClass       string `json:",omitempty"`
+	AWSRole            bool   `json:",omitempty"`
+	AWSRoleARN         string `json:",omitempty"`
+	AWSRoleSessionName string `json:",omitempty"`
+	DurationSeconds    int    `json:",omitempty"`
 }
 
 // S3Options supports NewTierS3 to take variadic options
@@ -76,6 +79,22 @@ func S3AWSRole() func(s3 *TierS3) error {
 	}
 }
 
+// S3AWSRoleARN helper to use optional AWS RoleARN to NewTierS3
+func S3AWSRoleARN(roleARN string) func(s3 *TierS3) error {
+	return func(s3 *TierS3) error {
+		s3.AWSRoleARN = roleARN
+		return nil
+	}
+}
+
+// S3AWSRoleSessionName helper to use optional AWS RoleSessionName to NewTierS3
+func S3AWSRoleSessionName(roleSessionName string) func(s3 *TierS3) error {
+	return func(s3 *TierS3) error {
+		s3.AWSRoleSessionName = roleSessionName
+		return nil
+	}
+}
+
 // NewTierS3 returns a TierConfig of S3 type. Returns error if the given
 // parameters are invalid like name is empty etc.
 func NewTierS3(name, accessKey, secretKey, bucket string, options ...S3Options) (*TierConfig, error) {