chore: update usage of minio admin library (#28)

* chore: update usage of minio admin library

madmin/api-error-response.go

@@ -0,0 +1,137 @@
+//
+// MinIO Object Storage (c) 2021 MinIO, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+package madmin
+
+import (
+	"encoding/hex"
+	"encoding/json"
+	"encoding/xml"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"net/http"
+	"unicode/utf8"
+)
+
+/* **** SAMPLE ERROR RESPONSE ****
+<?xml version="1.0" encoding="UTF-8"?>
+<Error>
+   <Code>AccessDenied</Code>
+   <Message>Access Denied</Message>
+   <BucketName>bucketName</BucketName>
+   <Key>objectName</Key>
+   <RequestId>F19772218238A85A</RequestId>
+   <HostId>GuWkjyviSiGHizehqpmsD1ndz5NClSP19DOT+s2mv7gXGQ8/X1lhbDGiIJEXpGFD</HostId>
+</Error>
+*/
+
+// ErrorResponse - Is the typed error returned by all API operations.
+type ErrorResponse struct {
+	XMLName    xml.Name `xml:"Error" json:"-"`
+	Code       string
+	Message    string
+	BucketName string
+	Key        string
+	RequestID  string `xml:"RequestId"`
+	HostID     string `xml:"HostId"`
+
+	// Region where the bucket is located. This header is returned
+	// only in HEAD bucket and ListObjects response.
+	Region string
+}
+
+// Error - Returns HTTP error string
+func (e ErrorResponse) Error() string {
+	return e.Message
+}
+
+const (
+	reportIssue = "Please report this issue at https://github.com/minio/minio/issues."
+)
+
+// httpRespToErrorResponse returns a new encoded ErrorResponse
+// structure as error.
+func httpRespToErrorResponse(resp *http.Response) error {
+	if resp == nil || resp.Body == nil {
+		msg := "Response is empty. " + reportIssue
+		return ErrInvalidArgument(msg)
+	}
+
+	defer closeResponse(resp)
+	// Limit to 100K
+	body, err := ioutil.ReadAll(io.LimitReader(resp.Body, 100<<10))
+	if err != nil {
+		return ErrorResponse{
+			Code:    resp.Status,
+			Message: fmt.Sprintf("Failed to read server response: %s.", err),
+		}
+	}
+
+	var errResp ErrorResponse
+	// Decode the json error
+	err = json.Unmarshal(body, &errResp)
+	if err != nil {
+		// We might get errors as XML, try that.
+		xmlErr := xml.Unmarshal(body, &errResp)
+
+		if xmlErr != nil {
+			bodyString := string(body)
+			if !utf8.Valid(body) {
+				bodyString = hex.EncodeToString(body)
+			}
+			if len(bodyString) > 1024 {
+				bodyString = bodyString[:1021] + "..."
+			}
+			return ErrorResponse{
+				Code:    resp.Status,
+				Message: fmt.Sprintf("Failed to parse server response (%s): %s", err.Error(), bodyString),
+			}
+		}
+	}
+	return errResp
+}
+
+// ToErrorResponse - Returns parsed ErrorResponse struct from body and
+// http headers.
+//
+// For example:
+//
+//	import admin "github.com/minio/madmin-go"
+//	...
+//	...
+//	ss, err := adm.ServiceStatus(...)
+//	if err != nil {
+//	   resp := admin.ToErrorResponse(err)
+//	}
+//	...
+func ToErrorResponse(err error) ErrorResponse {
+	switch err := err.(type) {
+	case ErrorResponse:
+		return err
+	default:
+		return ErrorResponse{}
+	}
+}
+
+// ErrInvalidArgument - Invalid argument response.
+func ErrInvalidArgument(message string) error {
+	return ErrorResponse{
+		Code:      "InvalidArgument",
+		Message:   message,
+		RequestID: "minio",
+	}
+}