Add facebook feed since they stopped supporting their own.

Gemfile

@@ -13,6 +13,7 @@ gem "airbrake"
 gem "rack-ssl-enforcer"
 gem "clogger"
 gem "heroku-env"
+gem "activesupport"
 
 group :development do
   gem "rake"

Gemfile.lock

@@ -1,6 +1,12 @@
 GEM
   remote: https://rubygems.org/
   specs:
+    activesupport (4.2.3)
+      i18n (~> 0.7)
+      json (~> 1.7, >= 1.7.7)
+      minitest (~> 5.1)
+      thread_safe (~> 0.3, >= 0.3.4)
+      tzinfo (~> 1.1)
     airbrake (4.3.0)
       builder
       multi_json
@@ -24,9 +30,11 @@ GEM
     httparty (0.13.5)
       json (~> 1.8)
       multi_xml (>= 0.5.2)
+    i18n (0.7.0)
     json (1.8.3)
     kgio (2.9.3)
     method_source (0.8.2)
+    minitest (5.7.0)
     multi_json (1.11.1)
     multi_xml (0.5.5)
     powder (0.3.0)
@@ -64,7 +72,10 @@ GEM
       sinatra-contrib
     slop (3.6.0)
     thor (0.19.1)
+    thread_safe (0.3.5)
     tilt (2.0.1)
+    tzinfo (1.2.2)
+      thread_safe (~> 0.1)
     unicorn (4.9.0)
       kgio (~> 2.6)
       rack
@@ -74,6 +85,7 @@ PLATFORMS
   ruby
 
 DEPENDENCIES
+  activesupport
   airbrake
   better_errors
   binding_of_caller

app.json

@@ -13,6 +13,14 @@
       "description": "(Optional) Your Google API key for YouTube queries.",
       "required": false
     },
+    "FACEBOOK_APP_ID": {
+      "description": "(Optional) Your Facebook app id.",
+      "required": false
+    },
+    "FACEBOOK_APP_SECRET": {
+      "description": "(Optional) Your Facebook app secret.",
+      "required": false
+    },
     "INSTAGRAM_CLIENT_ID": {
       "description": "(Optional) Your Instagram client id.",
       "required": false

app.rb

@@ -1,6 +1,7 @@
 require "sinatra"
 require "./config/application"
 require "erb"
+require "active_support/core_ext/string"
 
 class YoutubeException < Exception; end
 class FacebookException < Exception; end
@@ -66,16 +67,27 @@ def httparty_error(r)
     return "That doesn't look like a facebook url. Sorry."
   end
 
-  response = HTTParty.get("https://graph.facebook.com/#{name}")
+  response = HTTParty.get("https://graph.facebook.com/v2.3/#{name}?access_token=#{ENV["FACEBOOK_APP_ID"]}|#{ENV["FACEBOOK_APP_SECRET"]}")
   if response.code == 404
     return "Can't find a page with that name. Sorry."
   end
-  if !response.success?
-    raise FacebookException, response
-  end
-  facebook_id = response.parsed_response["id"]
+  raise FacebookException, response if !response.success?
+
+  data = response.parsed_response
+  redirect "/facebook/#{data["id"]}/#{data["username"]}"
+end
+
+get %r{/facebook/(?<id>\d+)(/(?<username>.+))?} do |id, username|
+  @id = id
 
-  redirect "https://www.facebook.com/feeds/page.php?format=rss20&id=#{facebook_id}"
+  response = HTTParty.get("https://graph.facebook.com/v2.3/#{id}/posts?access_token=#{ENV["FACEBOOK_APP_ID"]}|#{ENV["FACEBOOK_APP_SECRET"]}")
+  raise FacebookException, response if !response.success?
+
+  @data = response.parsed_response["data"]
+  @user = @data[0]["from"]["name"] rescue username
+
+  headers "Content-Type" => "application/atom+xml;charset=utf-8"
+  erb :facebook_feed
 end
 
 get "/instagram/auth" do

views/facebook_feed.erb

@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="utf-8"?>
+<feed xmlns="http://www.w3.org/2005/Atom">
+  <id>facebook:<%= @id %></id>
+  <title><%= @user %> on Facebook</title>
+  <icon>https://www.facebook.com/favicon.ico</icon>
+  <link href="<%= request.url %>" rel="self" />
+  <updated><%= @data[0]["updated_time"] if @data[0] %></updated>
+<%- @data.each do |post| -%>
+
+  <entry>
+    <id>facebook:post:<%= post["id"] %>:<%= post["updated_time"] %><%= ":#{params[:cachebuster]}" if params[:cachebuster] %></id>
+    <title><%= post["message"] ? post["message"].truncate(120) : post["type"] %></title>
+    <link href="<%= post["link"] || "https://www.facebook.com/#{post["id"]}" %>" />
+    <updated><%= post["updated_time"] %></updated>
+    <author><name><%= post["from"]["name"] %></name></author>
+    <content><%= post["message"] %></content>
+  </entry>
+<%- end -%>
+</feed>

views/index.erb

@@ -42,13 +42,15 @@
       </span>
     </form>
 
+<% if ENV["FACEBOOK_APP_ID"] and ENV["FACEBOOK_APP_SECRET"] %>
     <form class="input-group" method="get" action="/facebook" target="_self">
       <div class="input-group-addon"><label for="facebook_q">Facebook</label></div>
       <input class="form-control" type="search" name="q" id="facebook_q" placeholder="Enter url to a Facebook page.">
       <span class="input-group-btn">
         <input class="btn btn-primary" type="submit" value="Get RSS Feed">
       </span>
     </form>
+<% end %>
 
 <% if ENV["INSTAGRAM_ACCESS_TOKEN"] %>
     <form class="input-group" method="get" action="/instagram" target="_self">