discourse/app/models/global_setting.rb

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class GlobalSetting
def self.register(key, default)
define_singleton_method(key) do
provider.lookup(key, default)
end
end
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def self.load_defaults
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default_provider = FileProvider.from(File.expand_path('../../../config/discourse_defaults.conf', __FILE__))
default_provider.keys.concat(@provider.keys).uniq.each do |key|
default = default_provider.lookup(key, nil)
define_singleton_method(key) do
provider.lookup(key, default)
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end
end
end
class BaseProvider
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def self.coerce(setting)
return setting == "true" if setting == "true" || setting == "false"
return $1.to_i if setting.to_s.strip =~ /^([0-9]+)$/
setting
end
def resolve(current, default)
BaseProvider.coerce(
if current.present?
current
else
default.present? ? default : nil
end
)
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end
end
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class FileProvider < BaseProvider
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attr_reader :data
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def self.from(file)
if File.exists?(file)
parse(file)
end
end
def initialize(file)
@file = file
@data = {}
end
def read
File.read(@file).split("\n").each do |line|
if line =~ /([a-z_]+)\s*=\s*(\"([^\"]*)\"|\'([^\']*)\'|[^#]*)/
@data[$1.strip.to_sym] = ($4 || $3 || $2).strip
end
end
end
def lookup(key,default)
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var = @data[key]
resolve(var, var.nil? ? default : "")
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end
def keys
@data.keys
end
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private
def self.parse(file)
provider = self.new(file)
provider.read
provider
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end
end
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class EnvProvider < BaseProvider
def lookup(key, default)
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var = ENV["DISCOURSE_" << key.to_s.upcase]
resolve(var , var.nil? ? default : nil)
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end
def keys
ENV.keys.select{|k| k =~ /^DISCOURSE_/}.map{|k| k[10..-1].downcase.to_sym}
end
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end
class << self
attr_accessor :provider
end
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@provider =
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FileProvider.from(File.expand_path('../../../config/discourse.conf', __FILE__)) ||
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EnvProvider.new
load_defaults
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end