Add max_header_size field for PKI tokens

PKI tokens can be extremely large (>64k), requiring
a custom max_header_size to be configured.
This field defaults to the default from swift internal
defaults, which is 8192 bytes.

Change-Id: I9d2df074e333e110df4dfeaf5ba1cdab5c4ff19f
Related-Bug: #1470664

manifests/init.pp

@@ -12,6 +12,10 @@
 # [*client_package_ensure*] The ensure state for the swift client package.
 #   (Optional) Defaults to present.
 #
+# [*max_header_size*] Max HTTP header size for incoming requests for all swift
+#   services. Recommended size is 32768 for PKI keystone tokens.
+#   (Optional) Defaults to 8192
+#
 # == Dependencies
 #
 # None
@@ -28,6 +32,7 @@ class swift(
   $swift_hash_suffix,
   $package_ensure        = 'present',
   $client_package_ensure = 'present',
+  $max_header_size       = '8192',
 ) {
 
   include ::swift::params
@@ -68,4 +73,7 @@ class swift(
   swift_config { 'swift-hash/swift_hash_path_suffix':
     value => $swift_hash_suffix,
   }
+  swift_config { 'swift-constraints/max_header_size':
+    value => $max_header_size,
+  }
 }

spec/classes/swift_spec.rb

@@ -3,7 +3,10 @@ require 'spec_helper'
 describe 'swift' do
 
   let :params do
-    {:swift_hash_suffix => 'string'}
+    {
+      :swift_hash_suffix => 'string',
+      :max_header_size   => '16384',
+    }
   end
 
   let :facts do
@@ -51,6 +54,10 @@ describe 'swift' do
       is_expected.to contain_swift_config(
         'swift-hash/swift_hash_path_suffix').with_value('string')
     end
+    it 'configures swift.conf' do
+      is_expected.to contain_swift_config(
+        'swift-constraints/max_header_size').with_value('16384')
+    end
     it { is_expected.to contain_package('swift').with_ensure('present') }
   end