Implement Heroku Review Apps

app.json

@@ -0,0 +1,130 @@
+{
+  "name": "huboard-web",
+  "scripts": {
+  },
+  "env": {
+    "AWS_ACCESS_KEY_ID": {
+      "required": true
+    },
+    "AWS_S3_BUCKET": {
+      "required": true
+    },
+    "AWS_SECRET_ACCESS_KEY": {
+      "required": true
+    },
+    "BUILDPACK_URL": {
+      "required": true
+    },
+    "CLOUDFRONT_URL": {
+      "required": true
+    },
+    "COUCH_DATABASE": {
+      "required": true
+    },
+    "COUCH_URL": {
+      "required": true
+    },
+    "ELASTICSEARCH_URL": {
+      "required": true
+    },
+    "GITHUB_API_ENDPOINT": {
+      "required": true
+    },
+    "GITHUB_AUTH_STRATEGY": {
+      "required": true
+    },
+    "GITHUB_CLIENT_ID": {
+      "required": true
+    },
+    "GITHUB_SECRET": {
+      "required": true
+    },
+    "GITHUB_WEB_ENDPOINT": {
+      "required": true
+    },
+    "GITHUB_WEBHOOK_ENDPOINT": {
+      "required": true
+    },
+    "HEROKU_APP_ID": {
+      "required": true
+    },
+    "HEROKU_APP_NAME": {
+      "required": true
+    },
+    "HEROKU_PARENT_APP_NAME": {
+      "required": true
+    },
+    "HEROKU_RELEASE_VERSION": {
+      "required": true
+    },
+    "HEROKU_SLUG_COMMIT": {
+      "required": true
+    },
+    "HEROKU_SLUG_DESCRIPTION": {
+      "required": true
+    },
+    "HUBOARD_ENV": {
+      "required": true
+    },
+    "LANG": {
+      "required": true
+    },
+    "MAX_THREADS": {
+      "required": true
+    },
+    "RACK_ENV": {
+      "required": true
+    },
+    "RAILS_ENV": {
+      "required": true
+    },
+    "RAILS_SERVE_STATIC_FILES": {
+      "required": true
+    },
+    "RAYGUN_APIKEY": {
+      "required": true
+    },
+    "REDIS_URL": {
+      "required": true
+    },
+    "SECRET_KEY": {
+      "required": true
+    },
+    "SECRET_KEY_BASE": {
+      "required": true
+    },
+    "SEGEMENTIO_KEY": {
+      "required": true
+    },
+    "SEGMENTIO_KEY": {
+      "required": true
+    },
+    "SESSION_SECRET": {
+      "required": true
+    },
+    "SOCKET_BACKEND": {
+      "required": true
+    },
+    "STRIPE_API": {
+      "required": true
+    },
+    "STRIPE_PUBLISHABLE_API": {
+      "required": true
+    },
+    "STRIPE_SECRET_KEY": {
+      "required": true
+    },
+    "WARDEN_GITHUB_VERIFIER_SECRET": {
+      "required": true
+    }
+  },
+  "addons": [
+    "rediscloud",
+    "memcachier"
+  ],
+  "buildpacks": [
+    {
+      "url": "https://github.com/heroku/heroku-buildpack-multi"
+    }
+  ]
+}

config/initializers/warden.rb

@@ -21,3 +21,58 @@
 Warden::Manager.serialize_from_session { |key| Warden::GitHub::Verifier.load(key) }
 Warden::Manager.serialize_into_session { |user| Warden::GitHub::Verifier.dump(user) }
 
+require 'uri'
+
+module Warden
+  module GitHub
+    class Config
+      alias_method :base_normalized_uri, :normalized_uri
+
+      def normalized_uri(uri_or_path)
+        uri = base_normalized_uri(uri_or_path)
+
+        app_name = ENV["HEROKU_APP_NAME"]
+        parent_app_name = ENV["HEROKU_PARENT_APP_NAME"]
+        Rails.logger.info "Warden Override: #{app_name} => #{parent_app_name}"
+        if parent_app_name && parent_app_name != app_name
+          uri.host.sub! app_name, parent_app_name
+          uri.query = URI.encode_www_form("APP_NAME" => app_name)
+        end
+
+        Rails.logger.info "Warden Override: #{uri}"
+        uri
+      end
+    end
+  end
+end
+
+class Huboard
+  class Warden
+    class AppRedirect
+      def initialize(app, params={})
+        @app = app
+        @params = params
+      end
+
+      def call(env)
+        uri = Addressable::URI.parse(env['REQUEST_URI'])
+
+        app_name = uri.query_values['APP_NAME'] if uri.query_values
+        parent_app_name = ENV['HEROKU_APP_NAME']
+        Rails.logger.info "AppRedirect: #{parent_app_name} => #{app_name}" if app_name
+
+        if app_name && parent_app_name
+          uri.query_values = uri.query_values(Array).reject { |kvp| kvp[0] == 'APP_NAME' } unless !uri.query_values
+
+          app_redirect = "#{env['rack.url_scheme']}://#{env['HTTP_HOST'].sub(parent_app_name, app_name)}#{uri}"
+          Rails.logger.info "AppRedirect to #{app_redirect}"
+          return [302, {"Location" => app_redirect}, self]
+        end
+
+        @app.call env
+      end
+    end
+  end
+end
+
+Rails.application.middleware.insert_before Warden::Manager, Huboard::Warden::AppRedirect