From 2d05f8a79a0aa45776ee47f47615e68ea3d5602c Mon Sep 17 00:00:00 2001
From: Steve Pulec <spulec@gmail.com>
Date: Sun, 19 Mar 2017 11:09:30 -0400
Subject: [PATCH] Add functionality for iam get-user with current user. Closes
 #480.

---
 moto/iam/responses.py      | 9 +++++++--
 tests/test_iam/test_iam.py | 8 ++++++++
 2 files changed, 15 insertions(+), 2 deletions(-)

diff --git a/moto/iam/responses.py b/moto/iam/responses.py
index 318c04f3a..71e2993f9 100644
--- a/moto/iam/responses.py
+++ b/moto/iam/responses.py
@@ -1,7 +1,7 @@
 from __future__ import unicode_literals
 
 from moto.core.responses import BaseResponse
-from .models import iam_backend
+from .models import iam_backend, User
 
 
 class IamResponse(BaseResponse):
@@ -234,7 +234,12 @@ class IamResponse(BaseResponse):
 
     def get_user(self):
         user_name = self._get_param('UserName')
-        user = iam_backend.get_user(user_name)
+        if user_name:
+            user = iam_backend.get_user(user_name)
+        else:
+            user = User(name='default_user')
+            # If no user is specific, IAM returns the current user
+
         template = self.response_template(USER_TEMPLATE)
         return template.render(action='Get', user=user)
 
diff --git a/tests/test_iam/test_iam.py b/tests/test_iam/test_iam.py
index 076f33916..021d7c041 100644
--- a/tests/test_iam/test_iam.py
+++ b/tests/test_iam/test_iam.py
@@ -213,6 +213,14 @@ def test_get_user():
     conn.get_user('my-user')
 
 
+@mock_iam_deprecated()
+def test_get_current_user():
+    """If no user is specific, IAM returns the current user"""
+    conn = boto.connect_iam()
+    user = conn.get_user()['get_user_response']['get_user_result']['user']
+    user['user_name'].should.equal('default_user')
+
+
 @mock_iam()
 def test_list_users():
     path_prefix = '/'