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require 'active_support/core_ext/hash/keys'
module ActionController
# ActionController::Renderer allows to render arbitrary templates
# without requirement of being in controller actions.
#
# You get a concrete renderer class by invoking ActionController::Base#renderer.
# For example,
#
# ApplicationController.renderer
#
# It allows you to call method #render directly.
#
# ApplicationController.renderer.render template: '...'
#
# You can use a shortcut on controller to replace previous example with:
#
# ApplicationController.render template: '...'
#
# #render method allows you to use any options as when rendering in controller.
# For example,
#
# FooController.render :action, locals: { ... }, assigns: { ... }
#
# The template will be rendered in a Rack environment which is accessible through
# ActionController::Renderer#env. You can set it up in two ways:
#
# * by changing renderer defaults, like
#
# ApplicationController.renderer.defaults # => hash with default Rack environment
#
# * by initializing an instance of renderer by passing it a custom environment.
#
# ApplicationController.renderer.new(method: 'post', https: true)
#
class Renderer
attr_reader :defaults, :controller
DEFAULTS = {
http_host: 'example.org',
https: false,
method: 'get',
script_name: '',
input: ''
}.freeze
# Create a new renderer instance for a specific controller class.
def self.for(controller, env = {}, defaults = DEFAULTS.dup)
new(controller, env, defaults)
end
# Create a new renderer for the same controller but with a new env.
def new(env = {})
self.class.new controller, env, defaults
end
# Create a new renderer for the same controller but with new defaults.
def with_defaults(defaults)
self.class.new controller, env, self.defaults.merge(defaults)
end
# Accepts a custom Rack environment to render templates in.
# It will be merged with ActionController::Renderer.defaults
def initialize(controller, env, defaults)
@controller = controller
@defaults = defaults
@env = normalize_keys defaults.merge(env)
end
# Render templates with any options from ActionController::Base#render_to_string.
def render(*args)
raise 'missing controller' unless controller
request = ActionDispatch::Request.new @env
request.routes = controller._routes
instance = controller.new
instance.set_request! request
instance.set_response! controller.make_response!(request)
instance.render_to_string(*args)
end
private
def normalize_keys(env)
new_env = {}
env.each_pair { |k,v| new_env[rack_key_for(k)] = rack_value_for(k, v) }
new_env
end
RACK_KEY_TRANSLATION = {
http_host: 'HTTP_HOST',
https: 'HTTPS',
method: 'REQUEST_METHOD',
script_name: 'SCRIPT_NAME',
input: 'rack.input'
}
IDENTITY = ->(_) { _ }
RACK_VALUE_TRANSLATION = {
https: ->(v) { v ? 'on' : 'off' },
method: ->(v) { v.upcase },
}
def rack_key_for(key); RACK_KEY_TRANSLATION[key]; end
def rack_value_for(key, value)
RACK_VALUE_TRANSLATION.fetch(key, IDENTITY).call value
end
end
end
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