PLT-7705: API to get data retention policy. (#7539)

* PLT-7705: API to get data retention policy.

* Fix review comments.

model/client4.go

@@ -254,6 +254,10 @@ func (c *Client4) GetBrandRoute() string {
 	return fmt.Sprintf("/brand")
 }
 
+func (c *Client4) GetDataRetentionRoute() string {
+	return fmt.Sprintf("/data_retention")
+}
+
 func (c *Client4) GetElasticsearchRoute() string {
 	return fmt.Sprintf("/elasticsearch")
 }
@@ -2747,6 +2751,18 @@ func (c *Client4) PurgeElasticsearchIndexes() (bool, *Response) {
 	}
 }
 
+// Data Retention Section
+
+// GetDataRetentionPolicy will get the current server data retention policy details.
+func (c *Client4) GetDataRetentionPolicy() (*DataRetentionPolicy, *Response) {
+	if r, err := c.DoApiGet(c.GetDataRetentionRoute()+"/policy", ""); err != nil {
+		return nil, BuildErrorResponse(r, err)
+	} else {
+		defer closeBody(r)
+		return DataRetentionPolicyFromJson(r.Body), BuildResponse(r)
+	}
+}
+
 // Commands Section
 
 // CreateCommand will create a new command if the user have the right permissions.

model/data_retention_policy.go

@@ -0,0 +1,36 @@
+// Copyright (c) 2017-present Mattermost, Inc. All Rights Reserved.
+// See License.txt for license information.
+
+package model
+
+import (
+	"encoding/json"
+	"io"
+)
+
+type DataRetentionPolicy struct {
+	MessageDeletionEnabled bool  `json:"message_deletion_enabled"`
+	FileDeletionEnabled    bool  `json:"file_deletion_enabled"`
+	MessageRetentionCutoff int64 `json:"message_retention_cutoff"`
+	FileRetentionCutoff    int64 `json:"file_retention_cutoff"`
+}
+
+func (me *DataRetentionPolicy) ToJson() string {
+	b, err := json.Marshal(me)
+	if err != nil {
+		return ""
+	} else {
+		return string(b)
+	}
+}
+
+func DataRetentionPolicyFromJson(data io.Reader) *DataRetentionPolicy {
+	decoder := json.NewDecoder(data)
+	var me DataRetentionPolicy
+	err := decoder.Decode(&me)
+	if err == nil {
+		return &me
+	} else {
+		return nil
+	}
+}