delegate preview to a real harp server

server/harp_blog.rb

@@ -84,14 +84,6 @@ class HarpBlog
     read_post('drafts', id, draft: true)
   end
 
-  def preview_post(year, month, id)
-    read_rendered_post(File.join(year, month), id)
-  end
-
-  def preview_draft(id)
-    read_rendered_post('drafts', id)
-  end
-
   def create_post(title, body, url, extra_fields = nil)
     if !title || title.strip.length == 0
       title = find_title(url)
@@ -191,10 +183,6 @@ class HarpBlog
     path_for(*args)
   end
 
-  def rendered_post_path(dir, id)
-    path_for('www/posts', dir, id, 'index.html')
-  end
-
   def read_posts(post_dir, extra_fields = nil)
     extra_fields ||= {}
     post_data = read_post_data(post_path(post_dir))
@@ -235,17 +223,6 @@ class HarpBlog
     end
   end
 
-  def read_rendered_post(post_dir, id)
-    post_filename = rendered_post_path(post_dir, id)
-    if File.exists?(post_filename)
-      File.read(post_filename)
-    else
-      message = "missing rendered HTML for post #{post_dir}/#{id} at path #{post_filename}"
-      $stderr.puts "[HarpBlog#read_rendered_post] #{message}"
-      raise InvalidDataError.new(message)
-    end
-  end
-
   def save_post(action, post)
     git_fetch
     git_reset_hard('origin/master')

server/server.rb

@@ -14,6 +14,7 @@ CONFIG_DEFAULTS = {
   host: '127.0.0.1',
   hostname: `hostname --fqdn`.strip,
   port: 6706,
+  preview_port: 5000,
 }
 
 def env_value(name)
@@ -37,6 +38,8 @@ $config.each_key do |name|
   end
 end
 
+$config[:preview_url] = "http://#{$config[:hostname]}:#{$config[:preview_port]}"
+
 unless File.directory?($config[:path])
   raise RuntimeError.new("file not found: #{$config[:path]}")
 end
@@ -172,9 +175,8 @@ get '/posts/:year/:month/:id' do |year, month, id|
       headers 'Content-Type' => 'application/json'
       JSON.generate(post: post.fields)
     elsif request.accept?('text/html')
-      status 200
-      headers 'Content-Type' => 'text/html'
-      blog.preview_post(year, month, id)
+      status 302
+      headers "Location: #{$config[:preview_url]}/posts/#{year}/#{month}/#{id}"
     else
       status 400
       "content not available in an acceptable format: #{request.accept.join(', ')}"
@@ -200,9 +202,8 @@ get '/drafts/:id' do |id|
       headers 'Content-Type' => 'application/json'
       JSON.generate(post: post.fields)
     elsif request.accept?('text/html')
-      status 200
-      headers 'Content-Type' => 'text/html'
-      blog.preview_draft(id)
+      status 302
+      headers "Location: #{$config[:preview_url]}/posts/drafts/#{id}"
     else
       status 400
       "content not available in an acceptable format: #{request.accept.join(', ')}"

server/spec/harp_blog_spec.rb

@@ -167,16 +167,6 @@ RSpec.describe HarpBlog do
     end
   end
 
-  describe "#preview_post" do
-    it "should return some HTML" do
-      @blog.compile
-      first_post_path = File.join(TEST_BLOG_PATH, 'www/posts/2006/02/first-post/index.html')
-      expected_html = File.read(first_post_path)
-      html = @blog.preview_post('2006', '02', 'first-post')
-      expect(html).to eq(expected_html)
-    end
-  end
-
   describe '#create_post' do
     it "should create a link post when a link is given" do
       title = 'test post'