Create basic OpenGraph implementation.

circleco · Sep 9, 2017 · 023ce7d · 023ce7d
1 parent 9251938
commit 023ce7d
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Showing 8 changed files with 72 additions and 2 deletions.
diff --git a/.rspec b/.rspec
@@ -0,0 +1,2 @@
+--color
+--format documentation
diff --git a/Rakefile b/Rakefile
@@ -1,2 +1,6 @@
-require "bundler/gem_tasks"
+require 'bundler/gem_tasks'
+require 'rspec/core/rake_task'
+
+RSpec::Core::RakeTask.new('spec')
+
 task :default => :spec
diff --git a/lib/ogp.rb b/lib/ogp.rb
@@ -1,4 +1,5 @@
-require "ogp/version"
+require 'ogp/version'
+require 'ogp/open_graph'
 
 module OGP
   # Your code goes here...

diff --git a/lib/ogp/open_graph.rb b/lib/ogp/open_graph.rb
@@ -0,0 +1,26 @@
+require 'oga'
+
+REQUIRED_ATTRIBUTES = %w(title type image url)
+
+module OGP
+  class OpenGraph
+    attr_accessor :title, :type, :image, :url
+
+    def initialize(source)
+      document = Oga.parse_html(source)
+      parse_required_attributes(document)
+    end
+
+    private
+
+    def parse_required_attributes(document)
+      REQUIRED_ATTRIBUTES.each do |attribute_name|
+        instance_variable_set("@#{attribute_name}", parse_attribute(document, attribute_name))
+      end
+    end
+
+    def parse_attribute(document, name)
+      document.at_xpath("//head/meta[@property='og:#{name}']").get('content')
+    end
+  end
+end
diff --git a/ogp.gemspec b/ogp.gemspec
@@ -19,6 +19,8 @@ Gem::Specification.new do |spec|
   spec.test_files    = `git ls-files -- {test,spec,features}/*`.split("\n")
   spec.require_paths = ['lib']
 
+  spec.add_dependency 'oga', '~> 2.10'
+
   spec.add_development_dependency 'bundler', '~> 1.13'
   spec.add_development_dependency 'rake', '~> 10.0'
   spec.add_development_dependency 'rspec', '~> 3.6'

diff --git a/spec/lib/open_graph_spec.rb b/spec/lib/open_graph_spec.rb
@@ -0,0 +1,16 @@
+require 'spec_helper'
+
+describe OGP::OpenGraph do
+  describe '#initialize' do
+    context 'with strictly the required attributes' do
+      it 'should parse attributes properly' do
+        content = File.read("#{File.dirname(__FILE__)}/../view/required_attributes.html")
+        open_graph = OGP::OpenGraph.new(content)
+        expect(open_graph.title).to eql('The Rock')
+        expect(open_graph.type).to eql('video.movie')
+        expect(open_graph.url).to eql('http://www.imdb.com/title/tt0117500/')
+        expect(open_graph.image).to eql('http://ia.media-imdb.com/images/rock.jpg')
+      end
+    end
+  end
+end
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
@@ -0,0 +1,7 @@
+require 'rubygems'
+require 'bundler/setup'
+require 'ogp'
+
+RSpec.configure do |config|
+
+end
diff --git a/spec/view/required_attributes.html b/spec/view/required_attributes.html
@@ -0,0 +1,12 @@
+<!DOCTYPE html>
+<html>
+<head>
+  <meta content="The Rock" property="og:title">
+  <meta content="video.movie" property="og:type">
+  <meta content="http://www.imdb.com/title/tt0117500/" property="og:url">
+  <meta content="http://ia.media-imdb.com/images/rock.jpg" property="og:image">
+  <title></title>
+</head>
+<body>
+</body>
+</html>