(#5838) Added support for HEAD requests to the indirector.

Added the ability for the indirector to handle REST HEAD requests.
These are done using a new indirector method, head(), which should
return true if find() would return a result and false if find() would
return nil.

Access control for the head method is the union of that for the find
and save methods.  That is, if either find or save is allowed, then
head is allowed.  This is necessary so that users will not have to
change their authconfig to take advantage of the new feature.

Paired-with: Jesse Wolfe <jesse@puppetlabs.com>

2 files changed, 14 insertions, 0 deletions

diff --git a/lib/puppet/network/http/api/v1.rb b/lib/puppet/network/http/api/v1.rb
index dd4612a14..8aa1f0ee1 100644
--- a/lib/puppet/network/http/api/v1.rb
+++ b/lib/puppet/network/http/api/v1.rb
@@ -13,6 +13,9 @@ module Puppet::Network::HTTP::API::V1
     },
     "DELETE" => {
       :singular => :destroy
+    },
+    "HEAD" => {
+      :singular => :head
     }
   }
 
diff --git a/lib/puppet/network/http/handler.rb b/lib/puppet/network/http/handler.rb
index f22498b70..9e9356b2f 100644
--- a/lib/puppet/network/http/handler.rb
+++ b/lib/puppet/network/http/handler.rb
@@ -116,6 +116,17 @@ module Puppet::Network::HTTP::Handler
     end
   end
 
+  # Execute our head.
+  def do_head(indirection_request, request, response)
+    unless indirection_request.model.head(indirection_request.key, indirection_request.to_hash)
+      Puppet.info("Could not find #{indirection_request.indirection_name} for '#{indirection_request.key}'")
+      return do_exception(response, "Could not find #{indirection_request.indirection_name} #{indirection_request.key}", 404)
+    end
+
+    # No need to set a response because no response is expected from a
+    # HEAD request.  All we need to do is not die.
+  end
+
   # Execute our search.
   def do_search(indirection_request, request, response)
     result = indirection_request.model.search(indirection_request.key, indirection_request.to_hash)