Adding a script to import all of AWS' managed policies

fixes #1118

scripts/update_managed_policies.py

@@ -0,0 +1,63 @@
+#!/usr/bin/env python
+# This updates our local copies of AWS' managed policies
+# Invoked via `make update_managed_policies`
+#
+# Credit goes to
+#   https://gist.github.com/gene1wood/55b358748be3c314f956
+
+from botocore.exceptions import NoCredentialsError
+from datetime import datetime
+import boto3
+import json
+import sys
+
+output_file = "./moto/iam/aws_managed_policies.py"
+
+
+def json_serial(obj):
+    """JSON serializer for objects not serializable by default json code"""
+
+    if isinstance(obj, datetime):
+        serial = obj.isoformat()
+        return serial
+    raise TypeError("Type not serializable")
+
+
+client = boto3.client('iam')
+
+policies = {}
+
+paginator = client.get_paginator('list_policies')
+try:
+    response_iterator = paginator.paginate(Scope='AWS')
+    for response in response_iterator:
+        for policy in response['Policies']:
+            policies[policy['PolicyName']] = policy
+except NoCredentialsError:
+    print("USAGE:")
+    print("Put your AWS credentials into ~/.aws/credentials and run:")
+    print(__file__)
+    print("")
+    print("Or specify them on the command line:")
+    print("AWS_ACCESS_KEY_ID=your_personal_access_key AWS_SECRET_ACCESS_KEY=your_personal_secret {}".format(__file__))
+    print("")
+    sys.exit(1)
+
+for policy_name in policies:
+    response = client.get_policy_version(
+        PolicyArn=policies[policy_name]['Arn'],
+        VersionId=policies[policy_name]['DefaultVersionId'])
+    for key in response['PolicyVersion']:
+        policies[policy_name][key] = response['PolicyVersion'][key]
+
+with open(output_file, 'w') as f:
+    triple_quote = '\"\"\"'
+
+    f.write("# Imported via `make aws_managed_policies`\n")
+    f.write('aws_managed_policies_data = {}\n'.format(triple_quote))
+    f.write(json.dumps(policies,
+                     sort_keys=True,
+                     indent=4,
+                     separators=(',', ': '),
+                     default=json_serial))
+    f.write(triple_quote)