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