Github link validation - prep for user input

lib/github_link_validator.rb

@@ -0,0 +1,50 @@
+require 'net/http'
+require 'open-uri'
+
+module GithubLinkValidator
+  GITHUB_URL_REGEX = /\A(http:\/\/|https:\/\/|www.)*github.com\/([\w\-]+)\/([\w\-]+)(\/[\w\-]*\/*)*(.git)*\z/
+
+  def github_url?(url)
+    url =~ GITHUB_URL_REGEX
+  end
+
+  def append_https(url)
+    if url.start_with?('https')
+      url
+    elsif url.start_with?('http')
+      url.gsub!(/http:/, 'https:')
+    else
+      url = 'https://' + url
+    end
+  end
+
+  def remove_www(url)
+    return url.gsub!(/www./, '') if url.match(/www./)
+    url
+  end
+
+  def valid_url?(url)
+    github_preferred_url = remove_www(append_https(url))
+
+    begin
+      response = Net::HTTP.get_response(URI(github_preferred_url))
+      response.code == "200"
+    rescue
+      false
+    end
+  end
+
+  def parse_github_url(url)
+    url =~ GITHUB_URL_REGEX
+    github_org = $2
+    github_repo = $3
+
+    {github_org: github_org, github_repo: github_repo}
+  end
+
+  def get_github_details(url)
+    if github_url?(url) && valid_url?(url)
+      parse_github_url(url)
+    end
+  end
+end

spec/lib/github_link_validator_spec.rb

@@ -0,0 +1,75 @@
+require 'spec_helper'
+require "#{Rails.root}/lib/github_link_validator"
+
+describe GithubLinkValidator do
+  include GithubLinkValidator
+
+  let (:valid_github_urls) { ['http://www.github.com/codemontagehq/codemontage',
+                              'https://www.github.com/courte/codemontage',
+                              'http://github.com/dbness/codemontage',
+                              'www.github.com/codemontagehq/codemontage',
+                              'https://github.com/courte/codemontage',
+                              'github.com/dbness/codemontage',
+                              'https://github.com/CodeMontageHQ/codemontage/pull/269'] }
+
+  let (:valid_github_url) { 'www.github.com/codemontagehq/codemontage' }
+
+  describe '#github_url?' do
+
+    it 'returns true for accurate github repo urls' do
+      good_github_urls = valid_github_urls + ['https://github.com/fake/repo', 'www.github.com/banana/pudding-cup']
+
+      good_github_urls.each do |github_url|
+        expect(github_url?(github_url)).to be_true
+      end
+    end
+
+    it 'returns false for inaccurate github repo urls' do
+      urls = ['http://www.cnn.com', 'http://www.google.com/search?q=this+american+life', 'github.com/courte', 'https://commonplacebooks.com']
+
+      urls.each do |url|
+        expect(github_url?(url)).to be_false
+      end
+    end
+  end
+
+  describe '#valid_url?' do
+
+    it 'returns true for urls that are ok or redirect' do
+
+      valid_github_urls.each do |valid_url|
+        expect(valid_url?(valid_url)).to be_true
+      end
+    end
+
+    it 'returns false for invalid urls' do
+      invalid_urls = ["http://www.ajiofj.io", "https://bananacrabcakepalace.net", "https://github.com/woinvewnus/cuxywwe", "www.github.com/courte/notarepo", "github.com/ospreys-2014/phase-1-guide"]
+
+      invalid_urls.each do |invalid_url|
+        expect(valid_url?(invalid_url)).to be_false
+      end
+    end
+  end
+
+  describe '#parse_github_url' do
+
+    it 'returns the github org, pulled from the input url' do
+      url = 'www.github.com/codemontagehq/codemontage'
+      github_details = parse_github_url(valid_github_url)
+      expect(github_details[:github_org]).to eq('codemontagehq')
+    end
+
+    it 'returns the github repo, pulled from the input url' do
+      github_details = parse_github_url(valid_github_url)
+      expect(github_details[:github_repo]).to eq('codemontage')
+    end
+  end
+
+  describe '#get_github_details' do
+
+    it "returns the github org and repo in a hash" do
+      github_details = get_github_details(valid_github_url)
+      expect(github_details).to eq({github_org: 'codemontagehq', github_repo: 'codemontage'})
+    end
+  end
+end