Extract class for building SSL context

This commit extracts the `MiniSSL::Context` creation into its own
`MiniSSL::ContextBuilder` class along the same lines as in [#1989].

This will allow us to reuse this code for adding SSL support to the
control app (issue [#2015]). Since we will need the `MiniSSL` require
and check in both places, I moved that into the `ContextBuilder` class
as well.

[#1989]: #1989
[#2015]: #2015

lib/puma/binder.rb

@@ -5,6 +5,7 @@
 
 require 'puma/const'
 require 'puma/util'
+require 'puma/minissl/context_builder'
 
 module Puma
   class Binder
@@ -154,64 +155,7 @@ def parse(binds, logger)
           @listeners << [str, io]
         when "ssl"
           params = Util.parse_query uri.query
-          require 'puma/minissl'
-
-          MiniSSL.check
-
-          ctx = MiniSSL::Context.new
-
-          if defined?(JRUBY_VERSION)
-            unless params['keystore']
-              @events.error "Please specify the Java keystore via 'keystore='"
-            end
-
-            ctx.keystore = params['keystore']
-
-            unless params['keystore-pass']
-              @events.error "Please specify the Java keystore password  via 'keystore-pass='"
-            end
-
-            ctx.keystore_pass = params['keystore-pass']
-            ctx.ssl_cipher_list = params['ssl_cipher_list'] if params['ssl_cipher_list']
-          else
-            unless params['key']
-              @events.error "Please specify the SSL key via 'key='"
-            end
-
-            ctx.key = params['key']
-
-            unless params['cert']
-              @events.error "Please specify the SSL cert via 'cert='"
-            end
-
-            ctx.cert = params['cert']
-
-            if ['peer', 'force_peer'].include?(params['verify_mode'])
-              unless params['ca']
-                @events.error "Please specify the SSL ca via 'ca='"
-              end
-            end
-
-            ctx.ca = params['ca'] if params['ca']
-            ctx.ssl_cipher_filter = params['ssl_cipher_filter'] if params['ssl_cipher_filter']
-          end
-
-          ctx.no_tlsv1 = true if params['no_tlsv1'] == 'true'
-          ctx.no_tlsv1_1 = true if params['no_tlsv1_1'] == 'true'
-
-          if params['verify_mode']
-            ctx.verify_mode = case params['verify_mode']
-                              when "peer"
-                                MiniSSL::VERIFY_PEER
-                              when "force_peer"
-                                MiniSSL::VERIFY_PEER | MiniSSL::VERIFY_FAIL_IF_NO_PEER_CERT
-                              when "none"
-                                MiniSSL::VERIFY_NONE
-                              else
-                                @events.error "Please specify a valid verify_mode="
-                                MiniSSL::VERIFY_NONE
-                              end
-          end
+          ctx = MiniSSL::ContextBuilder.new(params, @events).context
 
           if fd = @inherited_fds.delete(str)
             logger.log "* Inherited #{str}"

lib/puma/minissl/context_builder.rb

@@ -0,0 +1,76 @@
+module Puma
+  module MiniSSL
+    class ContextBuilder
+      def initialize(params, events)
+        require 'puma/minissl'
+        MiniSSL.check
+
+        @params = params
+        @events = events
+      end
+
+      def context
+        ctx = MiniSSL::Context.new
+
+        if defined?(JRUBY_VERSION)
+          unless params['keystore']
+            events.error "Please specify the Java keystore via 'keystore='"
+          end
+
+          ctx.keystore = params['keystore']
+
+          unless params['keystore-pass']
+            events.error "Please specify the Java keystore password  via 'keystore-pass='"
+          end
+
+          ctx.keystore_pass = params['keystore-pass']
+          ctx.ssl_cipher_list = params['ssl_cipher_list'] if params['ssl_cipher_list']
+        else
+          unless params['key']
+            events.error "Please specify the SSL key via 'key='"
+          end
+
+          ctx.key = params['key']
+
+          unless params['cert']
+            events.error "Please specify the SSL cert via 'cert='"
+          end
+
+          ctx.cert = params['cert']
+
+          if ['peer', 'force_peer'].include?(params['verify_mode'])
+            unless params['ca']
+              events.error "Please specify the SSL ca via 'ca='"
+            end
+          end
+
+          ctx.ca = params['ca'] if params['ca']
+          ctx.ssl_cipher_filter = params['ssl_cipher_filter'] if params['ssl_cipher_filter']
+        end
+
+        ctx.no_tlsv1 = true if params['no_tlsv1'] == 'true'
+        ctx.no_tlsv1_1 = true if params['no_tlsv1_1'] == 'true'
+
+        if params['verify_mode']
+          ctx.verify_mode = case params['verify_mode']
+                            when "peer"
+                              MiniSSL::VERIFY_PEER
+                            when "force_peer"
+                              MiniSSL::VERIFY_PEER | MiniSSL::VERIFY_FAIL_IF_NO_PEER_CERT
+                            when "none"
+                              MiniSSL::VERIFY_NONE
+                            else
+                              events.error "Please specify a valid verify_mode="
+                              MiniSSL::VERIFY_NONE
+                            end
+        end
+
+        ctx
+      end
+
+      private
+
+      attr_reader :params, :events
+    end
+  end
+end