admin: Move SetCredentials from Service to Generic (#3805)

Setting credentials doesn't belong to service management API
anymore.

pkg/madmin/API.md

@@ -36,13 +36,13 @@ func main() {
 
 ```
 
-| Service operations|LockInfo operations|Healing operations|Config operations|
-|:---|:---|:---|:---|
-|[`ServiceStatus`](#ServiceStatus)| [`ListLocks`](#ListLocks)| [`ListObjectsHeal`](#ListObjectsHeal)|[`GetConfig`](#GetConfig)|
-|[`ServiceRestart`](#ServiceRestart)| [`ClearLocks`](#ClearLocks)| [`ListBucketsHeal`](#ListBucketsHeal)||
-| | |[`HealBucket`](#HealBucket) ||
-| | |[`HealObject`](#HealObject)||
-| | |[`HealFormat`](#HealFormat)||
+| Service operations|LockInfo operations|Healing operations|Config operations| Misc |
+|:---|:---|:---|:---|:---|
+|[`ServiceStatus`](#ServiceStatus)| [`ListLocks`](#ListLocks)| [`ListObjectsHeal`](#ListObjectsHeal)|[`GetConfig`](#GetConfig)| [`SetCredentials`](#SetCredentials)|
+|[`ServiceRestart`](#ServiceRestart)| [`ClearLocks`](#ClearLocks)| [`ListBucketsHeal`](#ListBucketsHeal)|||
+| | |[`HealBucket`](#HealBucket) |||
+| | |[`HealObject`](#HealObject)|||
+| | |[`HealFormat`](#HealFormat)|||
 
 ## 1. Constructor
 <a name="Minio"></a>
@@ -119,6 +119,9 @@ If successful restarts the running minio service, for distributed setup restarts
 	log.Printf("Success")
 
  ```
+
+## 3. Lock operations
+
 <a name="ListLocks"></a>
 ### ListLocks(bucket, prefix string, duration time.Duration) ([]VolumeLockInfo, error)
 If successful returns information on the list of locks held on ``bucket`` matching ``prefix`` for  longer than ``duration`` seconds.
@@ -149,6 +152,8 @@ __Example__
 
 ```
 
+## 4. Heal operations
+
 <a name="ListObjectsHeal"></a>
 ### ListObjectsHeal(bucket, prefix string, recursive bool, doneCh <-chan struct{}) (<-chan ObjectInfo, error)
 If successful returns information on the list of objects that need healing in ``bucket`` matching ``prefix``.
@@ -272,6 +277,9 @@ __Example__
     log.Println("successfully healed storage format on available disks.")
 
 ```
+
+## 5. Config operations
+
 <a name="GetConfig"></a>
 ### GetConfig() ([]byte, error)
 Get config.json of a minio setup.
@@ -293,3 +301,23 @@ __Example__
 
     log.Println("config received successfully: ", string(buf.Bytes()))
 ```
+
+## 6. Misc operations
+
+<a name="SetCredentials"></a>
+
+### SetCredentials() error 
+Set new credentials of a Minio setup.
+
+__Example__
+
+``` go
+    err = madmClnt.SetCredentials("YOUR-NEW-ACCESSKEY", "YOUR-NEW-SECRETKEY")
+    if err != nil {
+            log.Fatalln(err)
+    }
+    log.Println("New credentials successfully set.")
+
+```
+
+

pkg/madmin/examples/set-credentials.go

@@ -36,7 +36,7 @@ func main() {
 		log.Fatalln(err)
 	}
 
-	err = madmClnt.ServiceSetCredentials("YOUR-NEW-ACCESSKEY", "YOUR-NEW-SECRETKEY")
+	err = madmClnt.SetCredentials("YOUR-NEW-ACCESSKEY", "YOUR-NEW-SECRETKEY")
 	if err != nil {
 		log.Fatalln(err)
 	}

pkg/madmin/generic-commands.go

@@ -0,0 +1,72 @@
+/*
+ * Minio Cloud Storage, (C) 2016, 2017 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 (
+	"bytes"
+	"encoding/xml"
+	"errors"
+	"net/http"
+	"net/url"
+)
+
+// setCredsReq - xml to send to the server to set new credentials
+type setCredsReq struct {
+	Username string `xml:"username"`
+	Password string `xml:"password"`
+}
+
+// SetCredentials - Call Set Credentials API to set new access and secret keys in the specified Minio server
+func (adm *AdminClient) SetCredentials(access, secret string) error {
+
+	// Disallow sending with the server if the connection is not secure
+	if !adm.secure {
+		return errors.New("setting new credentials requires HTTPS connection to the server")
+	}
+
+	// Setup new request
+	reqData := requestData{}
+	reqData.queryValues = make(url.Values)
+	reqData.queryValues.Set("service", "")
+	reqData.customHeaders = make(http.Header)
+	reqData.customHeaders.Set(minioAdminOpHeader, "set-credentials")
+
+	// Setup request's body
+	body, err := xml.Marshal(setCredsReq{Username: access, Password: secret})
+	if err != nil {
+		return err
+	}
+	reqData.contentBody = bytes.NewReader(body)
+	reqData.contentLength = int64(len(body))
+	reqData.contentMD5Bytes = sumMD5(body)
+	reqData.contentSHA256Bytes = sum256(body)
+
+	// Execute GET on bucket to list objects.
+	resp, err := adm.executeMethod("POST", reqData)
+
+	defer closeResponse(resp)
+	if err != nil {
+		return err
+	}
+
+	// Return error to the caller if http response code is different from 200
+	if resp.StatusCode != http.StatusOK {
+		return httpRespToErrorResponse(resp)
+	}
+	return nil
+}

pkg/madmin/service-commands.go

@@ -18,10 +18,7 @@
 package madmin
 
 import (
-	"bytes"
 	"encoding/json"
-	"encoding/xml"
-	"errors"
 	"io/ioutil"
 	"net/http"
 	"net/url"
@@ -94,49 +91,3 @@ func (adm *AdminClient) ServiceRestart() error {
 	}
 	return nil
 }
-
-// setCredsReq - xml to send to the server to set new credentials
-type setCredsReq struct {
-	Username string `xml:"username"`
-	Password string `xml:"password"`
-}
-
-// ServiceSetCredentials - Call Service Set Credentials API to set new access and secret keys in the specified Minio server
-func (adm *AdminClient) ServiceSetCredentials(access, secret string) error {
-
-	// Disallow sending with the server if the connection is not secure
-	if !adm.secure {
-		return errors.New("setting new credentials requires HTTPS connection to the server")
-	}
-
-	// Setup new request
-	reqData := requestData{}
-	reqData.queryValues = make(url.Values)
-	reqData.queryValues.Set("service", "")
-	reqData.customHeaders = make(http.Header)
-	reqData.customHeaders.Set(minioAdminOpHeader, "set-credentials")
-
-	// Setup request's body
-	body, err := xml.Marshal(setCredsReq{Username: access, Password: secret})
-	if err != nil {
-		return err
-	}
-	reqData.contentBody = bytes.NewReader(body)
-	reqData.contentLength = int64(len(body))
-	reqData.contentMD5Bytes = sumMD5(body)
-	reqData.contentSHA256Bytes = sum256(body)
-
-	// Execute GET on bucket to list objects.
-	resp, err := adm.executeMethod("POST", reqData)
-
-	defer closeResponse(resp)
-	if err != nil {
-		return err
-	}
-
-	// Return error to the caller if http response code is different from 200
-	if resp.StatusCode != http.StatusOK {
-		return httpRespToErrorResponse(resp)
-	}
-	return nil
-}