Added support for liking blog posts via webmention

6 files changed, 46 insertions, 2 deletions

@@ -1,6 +1,9 @@
+require 'microformats'
 require 'redcarpet/render_strip'
+require 'webmention'
 
 class BlogsController < ApplicationController
+  skip_before_action :verify_authenticity_token, only: [:webmention]
 
   def summary
     @blogs = Blog.where(published: true).order(published_at: :desc).paginate(page: params[:page], per_page: 10)
@@ -89,4 +92,35 @@ class BlogsController < ApplicationController
     end
   end
 
+  def webmention
+    @blog = Blog.find_by_slug(params[:slug])
+
+    raise ActiveRecord::RecordNotFound unless @blog
+    raise ActiveRecord::RecordNotFound unless @blog.published
+
+    permalink = url_for(@blog)
+
+    target = params[:target]
+    unless target == permalink
+      render json: { error: "Incorrect target for webmention endpoint (#{target} != #{permalink})." }
+      return
+    end
+
+    source = params[:source]
+    verification = Webmention.verify_webmention(source, target)
+    unless verification.verified?
+      render json: { error: "Webmention could not be verified." }
+      return
+    end
+
+    response = Webmention::Request.get(source)
+    parsed = Microformats.parse(response.body.to_s)
+
+    if parsed.entry.properties.to_hash.include?("like-of") and parsed.entry.like_of(:all).map(&:to_s).include? permalink
+      @blog.like!(parsed.entry.author.url, parsed.entry.author.name)
+    end
+
+    head :ok
+  end
+
 end
@@ -39,5 +39,13 @@ module Votable
         save!
       end
     end
+
+    def like!(url, name)
+      return false unless votes.where(liker_url: url).empty?
+
+      votes.create(liker_url: url, liker_name: name, upvote: 1).save
+      self.upvotes += 1
+      save!
+    end
   end
 end
@@ -2,5 +2,4 @@ class Vote < ApplicationRecord
   belongs_to :votable, polymorphic: true
 
   validates :upvote, presence: true, inclusion: { in: [0, 1] }
-  validates :ip, presence: true
 end
@@ -19,7 +19,7 @@
   %cite.bubble.blog-cite
     %span.p-author.h-card
       %strong.p-name= blog.user.login.capitalize
-      %data.u-url{ value: "/" }
+      %data.u-url{ value: root_url }
     on
     %time.dt-published{ datetime: blog.visible_date.strftime("%Y-%m-%dT%H:%M:%SZ%z") }= blog.visible_date.strftime("%B #{blog.visible_date.day.ordinalize}, %Y at %-I:%M:%S%P")
   .post-vote{ id: "blog-vote-section-#{blog.id}" }
@@ -1,4 +1,5 @@
 - title @blog.title
+- content_for :webmention_endpoint, webmention_blog_url(@blog)
 - unless @prev.nil?
   .back-post= link_to "← #{@prev.title}", @prev
 - unless @next.nil?
@@ -6,6 +6,8 @@
     = stylesheet_link_tag    'main', media: 'all', 'data-turbolinks-track': 'reload'
     = javascript_include_tag 'application', 'data-turbolinks-track': 'reload'
     = display_meta_tags og: { site_name: "Four Island" }
+    - if content_for?(:webmention_endpoint)
+      %link{rel: "webmention", href: yield(:webmention_endpoint)}
   %body#main-body
     - if flash[:alert]
       %div#flash.flash-alert= flash[:alert]