foodsoft/lib/foodsoft_config.rb

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# encoding: utf-8
#
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# Foodcoop-specific configuration.
#
# This is loaded from +config/app_config.yml+, which contains a root
# key for each environment (plus an optional +defaults+ key). When using
# the multicoops feature (+multicoops+ is set to +true+ for the environment),
# each foodcoop has its own key.
#
# In addition to the configuration file, values can be overridden in the database
# using {RailsSettings::CachedSettings} as +foodcoop.<foodcoop_scope>.**+.
#
# Some values may not be set in the database (e.g. the database connection to
# sharedlists, or +default_scope+), these are defined as children of the
# +protected+ key. The default contains a sensible list, but you can modify
# that. Here's an almost minimal example:
#
# default:
# default_scope: f
# host: order.foodstuff.test # hostname for urls in emails
#
# name: Fairy Foodstuff # the name of our foodcoop
# contact:
# # ...
# email: fairy@foodstuff.test # general contact email address
#
# price_markup: 6 # foodcoop margin
#
# protected:
# shared_lists: false # allow database connection override
# use_messages: true # foodcoops can't disable the use of messages
#
# When you like to whitelist protected attributes, define an entry +all: true+,
# then you can whitelist specific attributes setting them to +false+.
#
class FoodsoftConfig
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# @!attribute scope
# Returns the current foodcoop scope for the multicoops feature, otherwise
# the value of the foodcoop configuration key +default_scope+ is used.
# @return [String] The current foodcoop scope.
mattr_accessor :scope
# @!attribute config
# Returns a {ActiveSupport::HashWithIndifferentAccess Hash} with the current
# scope's configuration from the configuration file. Note that this does not
# include values that were changed in the database.
# @return [ActiveSupport::HashWithIndifferentAccess] Current configuration from configuration file.
mattr_accessor :config
# Configuration file location.
# Taken from environment variable +FOODSOFT_APP_CONFIG+,
# or else +config/app_config.yml+.
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APP_CONFIG_FILE = ENV['FOODSOFT_APP_CONFIG'] || 'config/app_config.yml'
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# Loaded configuration
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APP_CONFIG = ActiveSupport::HashWithIndifferentAccess.new
class << self
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# Load and initialize foodcoop configuration file.
# @param filename [String] Override configuration file
def init(filename = APP_CONFIG_FILE)
Rails.logger.info "Loading app configuration from #{APP_CONFIG_FILE}"
APP_CONFIG.clear.merge! YAML.load(File.read(File.expand_path(filename, Rails.root)))
# Gather program-default configuration
self.default_config = get_default_config
# Load initial config from development or production
set_config Rails.env
# Overwrite scope to have a better namescope than 'production'
self.scope = config[:default_scope] or raise "No default_scope is set"
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# Set defaults for backward-compatibility
set_missing
end
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# Set config and database connection for specific foodcoop.
#
# Only needed in multi coop mode.
# @param foodcoop [String, Symbol] Foodcoop to select.
def select_foodcoop(foodcoop)
set_config foodcoop
setup_database
end
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# Return configuration value for the currently selected foodcoop.
#
# First tries to read configuration from the database (cached),
# then from the configuration files.
#
# FoodsoftConfig[:name] # => 'FC Test'
#
# To avoid errors when the database is not yet setup (when loading
# the initial database schema), cached settings are only being read
# when the settings table exists.
#
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# @param key [String, Symbol]
# @return [Object] Value of the key.
def [](key)
if RailsSettings::CachedSettings.table_exists? and allowed_key?(key)
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value = RailsSettings::CachedSettings["foodcoop.#{self.scope}.#{key}"]
value = config[key] if value.nil?
value
else
config[key]
end
end
# Store configuration in the database.
#
# If value is equal to what's defined in the configuration file, remove key from the database.
# @param key [String, Symbol] Key
# @param value [Object] Value
# @return [Boolean] Whether storing succeeded (fails when key is not allowed to be set in database).
def []=(key, value)
return false unless allowed_key?(key)
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value = normalize_value value
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# then update database
if config[key] == value or (config[key].nil? and value == false)
# delete (ok if it was already deleted)
begin
RailsSettings::CachedSettings.destroy "foodcoop.#{self.scope}.#{key}"
rescue RailsSettings::Settings::SettingNotFound
end
else
# or store
RailsSettings::CachedSettings["foodcoop.#{self.scope}.#{key}"] = value
end
return true
end
# @return [Array<String>] Configuration keys that are set (either in +app_config.yml+ or database).
def keys
keys = RailsSettings::CachedSettings.get_all("foodcoop.#{self.scope}.").try(:keys) || []
keys.map! {|k| k.gsub /^foodcoop\.#{self.scope}\./, ''}
keys += config.keys
keys.map(&:to_s).uniq
end
# Loop through each foodcoop and executes the given block after setup config and database
def each_coop
if config[:multi_coop_install]
APP_CONFIG.keys.reject { |coop| coop =~ /^(default|development|test|production)$/ }.each do |coop|
select_foodcoop coop
yield coop
end
else
yield config[:default_scope]
end
end
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# @return [Boolean] Whether this key may be set in the database
def allowed_key?(key)
# fast check for keys without nesting
if self.config[:protected].include? key
return !self.config[:protected][key]
else
return !self.config[:protected][:all]
end
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# @todo allow to check nested keys as well
end
# @return [Hash] Full configuration.
def to_hash
Hash[keys.map {|k| [k, self[k]]} ]
end
protected
# @!attribute default_config
# Returns the program-default foodcoop configuration.
#
# Plugins (engines in Rails terms) can easily add to the default
# configuration by defining a method +default_foodsoft_config+ in
# their engine and modify the {Hash} passed.
#
# When modifying this, please make sure to use default values that
# match old behaviour. For example, when the wiki was made optional
# and turned into a plugin, the configuration item +use_wiki+ was
# introduced with a default value of +true+ (set in the wiki plugin):
#
# module FoodsoftWiki
# class Engine < ::Rails::Engine
# def default_foodsoft_config(cfg)
# cfg[:use_wiki] = true # keep backward compatibility
# end
# end
# end
#
# @return [Hash] Default configuration values
mattr_accessor :default_config
private
def set_config(foodcoop)
raise "No config for this environment (#{foodcoop}) available!" if APP_CONFIG[foodcoop].nil?
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self.config = APP_CONFIG[foodcoop]
self.scope = foodcoop
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set_missing
end
def setup_database
database_config = ActiveRecord::Base.configurations[Rails.env]
database_config = database_config.merge(config[:database]) if config[:database].present?
ActiveRecord::Base.establish_connection(database_config)
end
# Completes foodcoop configuration with program defaults.
# @see #foodsoft_config
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def set_missing
config.replace(default_config.deep_merge(config))
end
# Returns program-default configuration.
# When new options are introduced, put backward-compatible defaults here, so that
# configuration files that haven't been updated, still work as they did. This also
# makes sure that the configuration editor picks up the defaults.
# @return [Hash] Program-default foodcoop configuration.
# @see #default_config
# @see #set_missing
def get_default_config
cfg = {
use_nick: true,
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use_apple_points: true,
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# English is the default language, and this makes it show up as default.
default_locale: 'en',
currency_unit: '€',
currency_space: true,
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foodsoft_url: 'https://github.com/foodcoops/foodsoft',
contact: {}, # avoid errors when undefined
# The following keys cannot, by default, be set by foodcoops themselves.
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protected: {
multi_coop_install: true,
default_scope: true,
notification: true,
shared_lists: true,
protected: true,
database: true
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}
}
# allow engines to easily add to this
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engines = Rails::Engine.subclasses.map(&:instance).select { |e| e.respond_to?(:default_foodsoft_config) }
engines.each { |e| e.default_foodsoft_config(cfg) }
cfg
end
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# Normalize value recursively (which can be entered as strings, but we want to store it properly)
def normalize_value(value)
value = value.map(&:normalize_value) if value.is_a? Array
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if value.is_a? Hash
value = ActiveSupport::HashWithIndifferentAccess[ value.to_a.map{|a| [a[0], normalize_value(a[1])]} ]
end
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case value
when 'true' then true
when 'false' then false
when /^[-+0-9]+$/ then value.to_i
when /^[-+0-9.]+([eE][-+0-9]+)?$/ then value.to_f
when '' then nil
else value
end
end
end
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end