Allow previe url to be configured per site

You can now configure the preview url per site.

    preview:
      My site name:
        host: https://www.my-static-site.com
        auth:
          username: <%= ENV["BASIC_AUTH_USERNAME"] %>
          password: <%= ENV["BASIC_AUTH_PASSWORD"] %>

config/alchemy/config.yml

@@ -55,6 +55,16 @@ items_per_page: 15
 #   auth:
 #     username: <%= ENV["BASIC_AUTH_USERNAME"] %>
 #     password: <%= ENV["BASIC_AUTH_PASSWORD"] %>
+#
+# Preview config per site is supported as well.
+#
+# preview:
+#   My site name:
+#     host: https://www.my-static-site.com
+#     auth:
+#       username: <%= ENV["BASIC_AUTH_USERNAME"] %>
+#       password: <%= ENV["BASIC_AUTH_PASSWORD"] %>
+#
 
 # === Picture rendering settings
 #

lib/alchemy/admin/preview_url.rb

@@ -19,16 +19,28 @@ module Admin
     #         username: <%= ENV["BASIC_AUTH_USERNAME"] %>
     #         password: <%= ENV["BASIC_AUTH_PASSWORD"] %>
     #
+    # Preview config per site is supported as well.
+    #
+    # == Example config/alchemy/config.yml
+    #
+    #     preview:
+    #       My site name:
+    #         host: https://www.my-static-site.com
+    #         auth:
+    #           username: <%= ENV["BASIC_AUTH_USERNAME"] %>
+    #           password: <%= ENV["BASIC_AUTH_PASSWORD"] %>
+    #
     class PreviewUrl
       class MissingProtocolError < StandardError; end
 
       def initialize(routes:)
         @routes = routes.url_helpers
-        @preview_config = Alchemy::Config.get(:preview)
       end
 
       def url_for(page)
-        if preview_config
+        @preview_config = preview_config_for(page)
+
+        if @preview_config && uri
           uri_class.build(
             host: uri.host,
             path: "/#{page.urlname}",
@@ -41,10 +53,19 @@ def url_for(page)
 
       private
 
-      attr_reader :preview_config, :routes
+      attr_reader :routes
+
+      def preview_config_for(page)
+        preview_config = Alchemy::Config.get(:preview)
+        return unless preview_config
+
+        preview_config[page.site.name] || preview_config
+      end
 
       def uri
-        URI(preview_config["host"])
+        return unless @preview_config["host"]
+
+        URI(@preview_config["host"])
       end
 
       def uri_class
@@ -56,7 +77,7 @@ def uri_class
       end
 
       def userinfo
-        auth = preview_config["auth"]
+        auth = @preview_config["auth"]
         auth ? "#{auth["username"]}:#{auth["password"]}" : nil
       end
     end

spec/libraries/admin/preview_url_spec.rb

@@ -70,6 +70,57 @@
           is_expected.to eq "https://foo:baz@www.example.com/#{page.urlname}"
         end
       end
+
+      context "for a site" do
+        before do
+          stub_alchemy_config(:preview, config)
+        end
+
+        context "that matches the pages site name" do
+          let(:config) do
+            {
+              page.site.name => {
+                "host" => "http://new.example.com",
+              },
+            }
+          end
+
+          it "returns the configured preview url for that site" do
+            is_expected.to eq "http://new.example.com/#{page.urlname}"
+          end
+        end
+
+        context "that does not match the pages site name" do
+          context "with a default configured" do
+            let(:config) do
+              {
+                "Not matching site name" => {
+                  "host" => "http://new.example.com",
+                },
+                "host" => "http://www.example.com",
+              }
+            end
+
+            it "returns the default configured preview url" do
+              is_expected.to eq "http://www.example.com/#{page.urlname}"
+            end
+          end
+
+          context "without a default configured" do
+            let(:config) do
+              {
+                "Not matching site name" => {
+                  "host" => "http://new.example.com",
+                },
+              }
+            end
+
+            it "returns the internal preview url" do
+              is_expected.to eq "/admin/pages/#{page.id}"
+            end
+          end
+        end
+      end
     end
   end
 end