metadata_plugin.rb
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class MetadataPlugin < Noosfero::Plugin
def self.plugin_name
_('Export metadata')
end
def self.plugin_description
_('Export metadata for models on meta tags')
end
def self.config
@config ||= HashWithIndifferentAccess.new(YAML.load File.read("#{File.dirname __FILE__}/../config.yml")) rescue {}
end
def self.og_types
@og_types ||= self.config[:open_graph][:types] rescue {}
end
Controllers = {
manage_products: {
variable: :@product,
},
content_viewer: {
variable: proc do
if profile and profile.home_page_id == @page.id
@profile
elsif @page.respond_to? :encapsulated_file
@page.encapsulated_file
else
@page
end
end,
},
profile: {
variable: :@profile,
},
# fallback
environment: {
variable: :@environment,
},
}
def head_ending
plugin = self
lambda do
options = MetadataPlugin::Controllers[controller.controller_path.to_sym]
options ||= MetadataPlugin::Controllers[:profile] if controller.is_a? ProfileController
options ||= MetadataPlugin::Controllers[:environment]
return unless options
return unless object = case variable = options[:variable]
when Proc then instance_exec(&variable) rescue nil
else instance_variable_get variable
end
return unless specs = (object.class.metadata_specs rescue nil)
r = []
specs.each do |namespace, spec|
namespace = "#{namespace}:" if namespace.present?
key_attr = spec[:key_attr] || :property
value_attr = spec[:value_attr] || :content
tags = spec[:tags]
tags.each do |key, values|
key = "#{namespace}#{key}"
values = values.call(object, plugin) rescue nil if values.is_a? Proc
next if values.blank?
Array(values).each do |value|
value = value.call(object, plugin) rescue nil if value.is_a? Proc
next if value.blank?
r << tag(:meta, key_attr => key, value_attr => value)
end
end
end
r.join
end
end
# context HELPERS
def og_url_for options
options.delete :port
options[:host] = self.class.config[:open_graph][:domain] rescue context.send(:environment).default_hostname
Noosfero::Application.routes.url_helpers.url_for options
end
def helpers
self.context.class.helpers
end
protected
end
ActiveSupport.run_load_hooks :metadata_plugin, MetadataPlugin
ActiveSupport.on_load :active_record do
ActiveRecord::Base.extend MetadataPlugin::Specs::ClassMethods
end