Fix aws-iam-users pagination (#2761)

* Fix aws-iam-users pagination

PROBLEM: aws-iam-users resource only retrieves 100 records due to pagination
in the AWS IAM list_users function.

FIX: Iterate over all the pages using the AWS pagination variables `marker`
and `is_truncated`

Signed-off-by: Richard Nixon <richard.nixon@btinternet.com>

lib/resources/aws/aws_iam_users.rb

@@ -37,9 +37,21 @@ class AwsIamUsers < Inspec.resource(1)
     raw_params
   end
 
+  def fetch_from_api_paginated(backend)
+    table = []
+    page_marker = nil
+    loop do
+      api_result = backend.list_users(marker: page_marker)
+      table += api_result.users.map(&:to_h)
+      page_marker = api_result.marker
+      break unless api_result.is_truncated
+    end
+    table
+  end
+
   def fetch_from_api
     backend = BackendFactory.create(inspec_runner)
-    @table = backend.list_users.users.map(&:to_h)
+    @table = fetch_from_api_paginated(backend)
 
     # TODO: lazy columns - https://github.com/chef/inspec-aws/issues/100
     @table.each do |user|

test/unit/resources/aws_iam_users_test.rb

@@ -103,7 +103,7 @@ module Maiusb
   #       Empty - No users
   # --------------------------------
   class Empty < AwsBackendBase
-    def list_users
+    def list_users(criteria = {})
       OpenStruct.new({
         users: []
       })
@@ -128,7 +128,7 @@ module Maiusb
   # Carol has a password and MFA device
   class Basic < AwsBackendBase
     # arn, path, user_id omitted
-    def list_users
+    def list_users(criteria = {})
       OpenStruct.new({
         users: [
           OpenStruct.new({