From e0be49a97dc0cfb55a4e2b9502aeb04750a86816 Mon Sep 17 00:00:00 2001
From: elijah <elijah@riseup.net>
Date: Tue, 17 Jun 2014 01:51:03 -0700
Subject: support for optional gems in Gemfile (engines/ and
 config/customization/gems/)

---
 Gemfile              | 36 +++++++++++++++++++----
 config/defaults.yml  |  5 +++-
 lib/gemfile_tools.rb | 83 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 118 insertions(+), 6 deletions(-)
 create mode 100644 lib/gemfile_tools.rb

diff --git a/Gemfile b/Gemfile
index ae11e0e..79e6e45 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,5 +1,7 @@
 source 'https://rubygems.org'
 
+require File.expand_path('../lib/gemfile_tools.rb', __FILE__)
+
 gem "rails", "~> 3.2.18"
 gem "couchrest", "~> 1.1.3"
 gem "couchrest_model", "~> 2.0.0"
@@ -10,9 +12,6 @@ gem "json"
 gem "ruby-srp", "~> 0.2.1"
 gem "rails_warden"
 
-gem 'leap_web_help', :path => 'engines/support'
-gem 'leap_web_billing', :path => 'engines/billing'
-
 gem 'http_accept_language'
 
 # To use debugger
@@ -45,7 +44,7 @@ group :test do
   gem 'poltergeist'         # headless js
   gem 'launchy'             # save_and_open_page
   gem 'phantomjs-binaries'  # binaries specific to the os
-  
+
   # moching and stubbing
   gem 'mocha', '~> 0.13.0', :require => false
   gem 'minitest-stub-const' # why?
@@ -53,7 +52,7 @@ group :test do
   # generating test data
   gem 'factory_girl_rails'  # test data factories
   gem 'faker'               # names and numbers for test data
-  
+
   # billing tests
   gem 'fake_braintree', require: false
 end
@@ -81,3 +80,30 @@ end
 
 # unreleased so far ... but leap_web_certs need it
 gem 'certificate_authority', :git => 'https://github.com/cchandler/certificate_authority.git'
+
+#
+# include optional gems and engines
+#
+
+group :test do
+  enabled_engines('test').each do |gem_name, gem_dir|
+    gem gem_name, :path => gem_dir
+  end
+end
+
+group :development do
+  enabled_engines('development').each do |gem_name, gem_dir|
+    gem gem_name, :path => gem_dir
+  end
+end
+
+group :production do
+  enabled_engines('production').each do |gem_name, gem_dir|
+    gem gem_name, :path => gem_dir
+  end
+end
+
+custom_gems.each do |gem_name, gem_dir|
+  gem gem_name, :path => gem_dir
+end
+
diff --git a/config/defaults.yml b/config/defaults.yml
index 1c7e694..0614d1e 100644
--- a/config/defaults.yml
+++ b/config/defaults.yml
@@ -34,7 +34,7 @@ common: &common
     token_expires_after: 60
   # handles that will be blocked from being used as logins or email aliases
   # in addition to the ones in /etc/passwd and http://tools.ietf.org/html/rfc2142
-  handle_blacklist: [certmaster, ssladmin, arin-admin, administrator, www-data, maildrop]
+  handle_blacklist: ['certmaster', 'ssladmin', 'arin-admin', 'administrator', 'www-data', 'maildrop', 'postmaster', 'admin', 'contact', 'info']
   # handles that will be allowed despite being in /etc/passwd or rfc2142
   handle_whitelist: []
   # actions enabled in the account settings
@@ -46,6 +46,9 @@ common: &common
   available_locales:
     - :en
   minimum_client_version: "0.5"
+  engines:
+    - support
+    - billing
 
 service_levels: &service_levels
   service_levels:
diff --git a/lib/gemfile_tools.rb b/lib/gemfile_tools.rb
new file mode 100644
index 0000000..2cdc42e
--- /dev/null
+++ b/lib/gemfile_tools.rb
@@ -0,0 +1,83 @@
+#
+# Utilities for use in Gemfile, in order to support
+# enabling and disabling gems, and including custom gems
+# in the deployment.
+#
+# Dynamic code in Gemfile is incompatible with
+# `bundle install --deployment` because dynamic code might
+# produce new Gemfile.lock. For this reason, this app must
+# be deployed with `bundle install --path vendor/bundle` instead.
+#
+
+require 'yaml'
+
+#
+# custom gems are gems placed in config/customization/gems.
+# this are added at deploy time by the platform.
+# The Gemfile.lock is then rebuilt to take these into account.
+#
+def custom_gems
+  custom_gem_dir = File.expand_path('../../config/customization/gems', __FILE__)
+  Dir["#{custom_gem_dir}/*"].collect{|gem_dir|
+    resolve_gem_directory(gem_dir)
+  }.compact
+end
+
+#
+# returns an array of [engine_name, engine_path] from Rails.root/engines/* that are
+# enabled. Uses the 'engines' key from config.yml to determine if engine is enabled
+#
+def enabled_engines(environment)
+  if local_config[environment]
+    if local_config[environment][:engines]
+      local_config[environment][:engines].collect {|engine_dir|
+        full_dir_path = File.join(File.expand_path("../../engines", __FILE__), engine_dir)
+        resolve_gem_directory(full_dir_path)
+      }.compact
+    else
+      []
+    end
+  else
+    []
+  end
+end
+
+#
+# local_config can be accessed as an indifferent hash of
+# the merger of config/default.yml and config/config.yml
+#
+def local_config
+  @local_config ||= begin
+    # a quick and dirty indifferent hash (note: does not affect children):
+    empty_hash = {}
+    empty_hash.default_proc = proc{|h, k| h.key?(k.to_s) ? h[k.to_s] : nil}
+    ["defaults.yml", "config.yml"].inject(empty_hash.dup) {|config, file|
+      filepath = File.join(File.expand_path("../../config", __FILE__), file)
+      if File.exists?(filepath)
+        new_config = YAML.load_file(filepath)
+        ['development', 'test','production'].each do |env|
+          config[env] ||= empty_hash.dup
+          config[env].merge!(new_config[env])
+        end
+      end
+      config
+    }
+  end
+end
+
+#
+# return [gem_name, relative_gem_path] for gem at the specific directory
+# or nil if not actually a gem directory
+#
+def resolve_gem_directory(gem_dir)
+  if Dir.exists?(gem_dir)
+    gemspec = Dir["#{gem_dir}/*.gemspec"]
+    if gemspec.any?
+      gem_name = File.basename(gemspec.first).sub(/\.gemspec$/,'')
+      [gem_name, gem_dir]
+    end
+  else
+    puts "Warning: no gem at `#{gem_dir}`"
+    nil
+  end
+end
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