Add Stack Exchange onebox

lib/oneboxer/stack_exchange_onebox.rb

@@ -0,0 +1,46 @@
+require_dependency 'oneboxer/handlebars_onebox'
+
+module Oneboxer
+  class StackExchangeOnebox < HandlebarsOnebox
+    DOMAINS = [
+      'stackexchange',
+      'stackoverflow',
+      'superuser',
+      'serverfault',
+      'askubuntu'
+    ]
+
+    # http://rubular.com/r/V3T0I1VTPn
+    REGEX =
+      /^http:\/\/(?:(?<subdomain>\w*)\.)?(?<domain>#{DOMAINS.join('|')})\.com\/(?:questions|q)\/(?<question>\d*)/
+
+    matcher REGEX
+    favicon 'stackexchange.png'
+
+    def translate_url
+      @url.match(REGEX) do |match|
+        site = if match[:domain] == 'stackexchange'
+          match[:subdomain]
+        else
+          match[:domain]
+        end
+
+        ["http://api.stackexchange.com/2.1/",
+         "questions/#{match[:question]}",
+         "?site=#{site}"
+        ].join
+      end
+    end
+
+    def parse(data)
+      result = JSON.parse(data)['items'].first
+
+      result['creation_date'] =
+        Time.at(result['creation_date'].to_i).strftime("%I:%M%p - %d %b %y")
+
+      result['tags'] = result['tags'].take(4).join(', ')
+
+      result
+    end
+  end
+end

lib/oneboxer/templates/stack_exchange_onebox.hbrs

@@ -0,0 +1,38 @@
+<div class="onebox-result">
+  {{#host}}
+    <div class="source">
+      <div class="info">
+        <a href="{{link}}" class="track-link" target="_blank">
+          {{#favicon}}
+            <img class="favicon" src="{{favicon}}">
+          {{/favicon}}
+          {{host}}
+        </a>
+      </div>
+    </div>
+  {{/host}}
+
+  <div class="onebox-result-body">
+    {{#owner.profile_image}}
+      <a href="{{owner.link}}" target="_blank">
+        <img alt="{{owner.display_name}}" src="{{owner.profile_image}}">
+      </a>
+    {{/owner.profile_image}}
+
+    <h4>
+      <a href="{{link}}" target="_blank">{{{title}}}</a>
+    </h4>
+
+    <div class="date">
+      asked by <a href="{{owner.link}}" target="_blank">
+        {{owner.display_name}}
+      </a>
+      on <a href="{{link}}" target="_blank">{{creation_date}}</a>
+    </div>
+
+    <div>
+      <strong>{{tags}}</strong>
+    </div>
+  </div>
+  <div class="clearfix"></div>
+</div>

spec/components/oneboxer/stack_exchange_onebox_spec.rb

@@ -0,0 +1,52 @@
+require 'spec_helper'
+
+describe Oneboxer::StackExchangeOnebox do
+  describe '#translate_url' do
+    let(:question) { '15622543' }
+    let(:api_url) {
+      "http://api.stackexchange.com/2.1/questions/#{question}?site=#{site}"
+    }
+
+    context 'when the question is from Stack Overflow' do
+      let(:site) { 'stackoverflow' }
+
+      it 'returns the correct api url for an expanded url' do
+        onebox = described_class.new([
+          "http://#{site}.com/",
+          "questions/#{question}/discourse-ruby-2-0-rails-4"
+        ].join)
+
+        expect(onebox.translate_url).to eq api_url
+      end
+
+      it 'returns the correct api url for a share url' do
+        onebox = described_class.new("http://#{site}.com/q/#{question}")
+
+        expect(onebox.translate_url).to eq api_url
+      end
+    end
+
+    context 'when the question is from Super User' do
+      let(:site) { 'superuser' }
+
+      it 'returns the correct api url' do
+        onebox = described_class.new("http://#{site}.com/q/#{question}")
+
+        expect(onebox.translate_url).to eq api_url
+      end
+    end
+
+    context 'when the question is from a Stack Exchange subdomain' do
+      let(:site) { 'gamedev' }
+
+      it 'returns the correct api url' do
+        onebox = described_class.new([
+          "http://#{site}.stackexchange.com/",
+          "questions/#{question}/how-to-prevent-the-too-awesome-to-use-syndrome"
+        ].join)
+
+        expect(onebox.translate_url).to eq api_url
+      end
+    end
+  end
+end