Initial commit of insomniaircd_webhookHEADmaster

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diff --git a/README.md b/README.md
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+insomniaircd_webhook
+====================
+
+This is a simple GitHub webhook receiver to regenerate the InsomniaIRC network configs.
+
+### Environment Variables
+
+* `HOSTNAME` should be set to the IRCD hostname to generate the config for.
+* `SECRET_KEY` should be set to the AES key to decrypt secrets in the config.
+* `SECRET_TOKEN` should be set to the secret token in the GitHub webhook configuration.
+
+Example command:
+
+    HOSTNAME=hypocrisy.insomniairc.net \
+    SECRET_KEY=SUPER_SECRET_KEY \
+    SECRET_TOKEN=DIFFERENT_SECRET \
+    ruby lib/insomniaircd_webhook.rb
diff --git a/lib/insomniaircd_webhook.rb b/lib/insomniaircd_webhook.rb
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+require 'json'
+require 'rack/utils'
+require 'sinatra'
+
+FileUtils.mkdir_p 'repos'
+
+post '/webhook' do
+  payload = request.body.read
+  verify_signature(payload)
+  data = JSON.parse(payload)
+
+  event = request.env['HTTP_X_GITHUB_EVENT']
+  if event == "ping"
+    ping data
+
+  elsif event == "push"
+    push data
+
+  else
+    404
+  end
+end
+
+def ping(data)
+  "pong"
+end
+
+def push(data)
+  ref = data["ref"]
+  who = data["sender"]["login"]
+  repo = data["repository"]["name"]
+  url = data["repository"]["clone_url"]
+
+  puts "#{who} pushed to #{ref} on repository #{repo}"
+
+  if ref == 'refs/heads/master'
+    if generate_config repo, url
+      200
+    else
+      500
+    end
+  end
+end
+
+def verify_signature(payload_body)
+  if ENV['SECRET_TOKEN']
+    signature = 'sha1=' + OpenSSL::HMAC.hexdigest(OpenSSL::Digest.new('sha1'), ENV['SECRET_TOKEN'], payload_body)
+    return halt 500, "Signatures didn't match!" unless Rack::Utils.secure_compare(signature, request.env['HTTP_X_HUB_SIGNATURE'])
+  end
+end
diff --git a/lib/insomniaircd_webhook/util.rb b/lib/insomniaircd_webhook/util.rb
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+
+def generate_config(repo, url)
+  if File.directory? "repos/#{repo}"
+    clone_success = system "cd repos/#{repo} && git pull"
+  else
+    clone_success = system "git clone #{url} repos/#{repo}"
+  end
+
+  if clone_success
+    system "cd repos/#{repo} && rake"
+  end
+end
+