MM-12067: Add SetDefaultProfileImage to reset the user profile image to a generated one (#9449)

* MM-12067: Add SetDefaultProfileImage to reset the user profile image to a generated one

* Allow to get the default profile image for my user

* Allowing to reset the last update image date to 0

* PR reviews

model/client4.go

@@ -723,7 +723,23 @@ func (c *Client4) AutocompleteUsers(username string, etag string) (*UserAutocomp
 	}
 }
 
-// GetProfileImage gets user's profile image. Must be logged in or be a system administrator.
+// GetDefaultProfileImage gets the default user's profile image. Must be logged in.
+func (c *Client4) GetDefaultProfileImage(userId string) ([]byte, *Response) {
+	r, appErr := c.DoApiGet(c.GetUserRoute(userId)+"/image/default", "")
+	if appErr != nil {
+		return nil, BuildErrorResponse(r, appErr)
+	}
+	defer closeBody(r)
+
+	data, err := ioutil.ReadAll(r.Body)
+	if err != nil {
+		return nil, BuildErrorResponse(r, NewAppError("GetDefaultProfileImage", "model.client.read_file.app_error", nil, err.Error(), r.StatusCode))
+	}
+
+	return data, BuildResponse(r)
+}
+
+// GetProfileImage gets user's profile image. Must be logged in.
 func (c *Client4) GetProfileImage(userId, etag string) ([]byte, *Response) {
 	if r, err := c.DoApiGet(c.GetUserRoute(userId)+"/image", etag); err != nil {
 		return nil, BuildErrorResponse(r, err)
@@ -1105,6 +1121,15 @@ func (c *Client4) SendVerificationEmail(email string) (bool, *Response) {
 	}
 }
 
+// SetDefaultProfileImage resets the profile image to a default generated one
+func (c *Client4) SetDefaultProfileImage(userId string) (bool, *Response) {
+	r, err := c.DoApiDelete(c.GetUserRoute(userId) + "/image")
+	if err != nil {
+		return false, BuildErrorResponse(r, err)
+	}
+	return CheckStatusOK(r), BuildResponse(r)
+}
+
 // SetProfileImage sets profile image of the user
 func (c *Client4) SetProfileImage(userId string, data []byte) (bool, *Response) {
 	body := &bytes.Buffer{}