From a996f3bd05fc480247fd112f23fa3e67f7d5d7b5 Mon Sep 17 00:00:00 2001
From: Star Rauchenberger <fefferburbia@gmail.com>
Date: Sat, 7 Dec 2024 15:54:39 -0500
Subject: Added support for liking blog posts via webmention

---
 Gemfile                                            |  2 ++
 Gemfile.lock                                       | 31 ++++++++++++++++++++
 app/controllers/blogs_controller.rb                | 34 ++++++++++++++++++++++
 app/models/concerns/votable.rb                     |  8 +++++
 app/models/vote.rb                                 |  1 -
 app/views/blogs/_blog.html.haml                    |  2 +-
 app/views/blogs/show.html.haml                     |  1 +
 app/views/layouts/application.html.haml            |  2 ++
 config/routes.rb                                   |  1 +
 .../20241207200746_add_like_fields_to_vote.rb      |  8 +++++
 db/schema.rb                                       |  4 ++-
 11 files changed, 91 insertions(+), 3 deletions(-)
 create mode 100644 db/migrate/20241207200746_add_like_fields_to_vote.rb

diff --git a/Gemfile b/Gemfile
index d0f9528..d6ca5e9 100644
--- a/Gemfile
+++ b/Gemfile
@@ -85,3 +85,5 @@ gem "image_processing", ">= 1.2"
 gem "meta-tags"
 gem 'rails_autolink'
 gem 'whenever', "~> 1.0.0", require: false
+gem "webmention"
+gem 'microformats', '~> 4.0', '>= 4.2.1'
diff --git a/Gemfile.lock b/Gemfile.lock
index a3408d7..cc60005 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -137,6 +137,7 @@ GEM
       railties (>= 4.1.0)
       responders
       warden (~> 1.2.3)
+    domain_name (0.6.20240107)
     drb (2.2.0)
       ruby2_keywords
     ed25519 (1.3.0)
@@ -145,6 +146,9 @@ GEM
     erubi (1.12.0)
     execjs (2.9.1)
     ffi (1.16.3)
+    ffi-compiler (1.3.2)
+      ffi (>= 1.15.5)
+      rake
     globalid (1.2.1)
       activesupport (>= 6.1)
     haml (6.2.3)
@@ -152,11 +156,24 @@ GEM
       thor
       tilt
     highline (2.1.0)
+    http (5.2.0)
+      addressable (~> 2.8)
+      base64 (~> 0.1)
+      http-cookie (~> 1.0)
+      http-form_data (~> 2.2)
+      llhttp-ffi (~> 0.5.0)
+    http-cookie (1.0.8)
+      domain_name (~> 0.5)
+    http-form_data (2.3.0)
     i18n (1.14.1)
       concurrent-ruby (~> 1.0)
     image_processing (1.12.2)
       mini_magick (>= 4.9.5, < 5)
       ruby-vips (>= 2.0.17, < 3)
+    indieweb-endpoints (8.0.0)
+      http (~> 5.0)
+      link-header-parser (~> 5.0)
+      nokogiri (>= 1.13)
     io-console (0.6.0)
     irb (1.8.3)
       rdoc
@@ -172,10 +189,15 @@ GEM
       railties (>= 3.2.16)
     js-routes (2.2.7)
       railties (>= 4)
+    json (2.9.0)
     libv8-node (18.16.0.0)
+    link-header-parser (5.1.1)
     listen (3.0.8)
       rb-fsevent (~> 0.9, >= 0.9.4)
       rb-inotify (~> 0.9, >= 0.9.7)
+    llhttp-ffi (0.5.0)
+      ffi-compiler (~> 1.0)
+      rake (~> 13.0)
     loofah (2.21.4)
       crass (~> 1.0.2)
       nokogiri (>= 1.12.0)
@@ -187,6 +209,9 @@ GEM
     marcel (1.0.2)
     meta-tags (2.19.0)
       actionpack (>= 3.2.0, < 7.2)
+    microformats (4.5.0)
+      json
+      nokogiri
     mime-types (3.5.1)
       mime-types-data (~> 3.2015)
     mime-types-data (3.2023.1003)
@@ -339,6 +364,10 @@ GEM
       activemodel (>= 6.0.0)
       bindex (>= 0.4.0)
       railties (>= 6.0.0)
+    webmention (7.0.0)
+      http (~> 5.0)
+      indieweb-endpoints (~> 8.0)
+      nokogiri (>= 1.13)
     webrick (1.8.1)
     websocket (1.2.10)
     websocket-driver (0.7.6)
@@ -380,6 +409,7 @@ DEPENDENCIES
   js-routes
   listen (>= 3.0.5, < 3.2)
   meta-tags
+  microformats (~> 4.0, >= 4.2.1)
   mini_racer
   mysql2
   normalize-rails
@@ -398,6 +428,7 @@ DEPENDENCIES
   turbolinks (~> 5)
   tzinfo-data
   web-console (>= 3.3.0)
+  webmention
   webrick (~> 1.7)
   whenever (~> 1.0.0)
   will_paginate (~> 4.0)
diff --git a/app/controllers/blogs_controller.rb b/app/controllers/blogs_controller.rb
index 033d6bb..4bbbc28 100644
--- a/app/controllers/blogs_controller.rb
+++ b/app/controllers/blogs_controller.rb
@@ -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
diff --git a/app/models/concerns/votable.rb b/app/models/concerns/votable.rb
index ba6e6d5..40b3a2a 100644
--- a/app/models/concerns/votable.rb
+++ b/app/models/concerns/votable.rb
@@ -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
diff --git a/app/models/vote.rb b/app/models/vote.rb
index e2d8386..fced5bd 100644
--- a/app/models/vote.rb
+++ b/app/models/vote.rb
@@ -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
diff --git a/app/views/blogs/_blog.html.haml b/app/views/blogs/_blog.html.haml
index d0b81d1..878b1a2 100644
--- a/app/views/blogs/_blog.html.haml
+++ b/app/views/blogs/_blog.html.haml
@@ -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}" }
diff --git a/app/views/blogs/show.html.haml b/app/views/blogs/show.html.haml
index 7558257..c849143 100644
--- a/app/views/blogs/show.html.haml
+++ b/app/views/blogs/show.html.haml
@@ -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?
diff --git a/app/views/layouts/application.html.haml b/app/views/layouts/application.html.haml
index 69cd6ba..ec37f73 100644
--- a/app/views/layouts/application.html.haml
+++ b/app/views/layouts/application.html.haml
@@ -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]
diff --git a/config/routes.rb b/config/routes.rb
index 6f7b7de..21e1517 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -51,6 +51,7 @@ Rails.application.routes.draw do
     member do
       post 'upvote'
       post 'downvote'
+      post 'webmention'
 
       resources :comments, only: [:create]
     end
diff --git a/db/migrate/20241207200746_add_like_fields_to_vote.rb b/db/migrate/20241207200746_add_like_fields_to_vote.rb
new file mode 100644
index 0000000..eae2816
--- /dev/null
+++ b/db/migrate/20241207200746_add_like_fields_to_vote.rb
@@ -0,0 +1,8 @@
+class AddLikeFieldsToVote < ActiveRecord::Migration[7.1]
+  def change
+    change_table :votes do |t|
+      t.string :liker_url
+      t.string :liker_name
+    end
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index 9cfdf57..b01ed43 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema[7.1].define(version: 2024_03_20_145033) do
+ActiveRecord::Schema[7.1].define(version: 2024_12_07_200746) do
   create_table "active_storage_attachments", force: :cascade do |t|
     t.string "name", null: false
     t.string "record_type", null: false
@@ -421,6 +421,8 @@ ActiveRecord::Schema[7.1].define(version: 2024_03_20_145033) do
     t.string "ip"
     t.datetime "created_at", null: false
     t.datetime "updated_at", null: false
+    t.string "liker_url"
+    t.string "liker_name"
     t.index ["votable_type", "votable_id"], name: "index_votes_on_votable"
   end
 
-- 
cgit 1.4.1