refactor: split up ResponseHandler

Now we have a Dispatcher and two ResponseHandlers that have the same interface.

Moving towards a Chain of Responsibility pattern.

1 files changed, 49 insertions, 0 deletions

diff --git a/lib/nickserver/request_handlers/email_handler.rb b/lib/nickserver/request_handlers/email_handler.rb
new file mode 100644
index 0000000..3f7515d
--- /dev/null
+++ b/lib/nickserver/request_handlers/email_handler.rb
@@ -0,0 +1,49 @@
+require 'nickserver/email_address'
+require 'nickserver/error_response'
+require 'nickserver/hkp/source'
+require 'nickserver/couch_db/source'
+
+module Nickserver
+  module RequestHandlers
+    class EmailHandler
+
+      def call(request)
+        email = EmailAddress.new(request.email)
+        if email.invalid?
+          ErrorResponse.new("Not a valid address")
+        else
+          send_key(email, request)
+        end
+      end
+
+      protected
+
+      def send_key(email, request)
+        if local_address?(email, request)
+          source = Nickserver::CouchDB::Source.new
+        else
+          source = Nickserver::Hkp::Source.new
+        end
+        source.query(email)
+      rescue MissingHostHeader
+        ErrorResponse.new("HTTP request must include a Host header.")
+      end
+
+      #
+      # Return true if the user address is for a user of this service provider.
+      # e.g. if the provider is example.org, then alice@example.org returns true.
+      #
+      # If 'domain' is not configured, we rely on the Host header of the HTTP request.
+      #
+      def local_address?(email, request)
+        domain = Config.domain || request.domain
+        raise MissingHostHeader if domain == ''
+        email.domain? domain
+      end
+    end
+
+
+    class MissingHostHeader < StandardError
+    end
+  end
+end