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require "active_support/inflector/methods"
require "active_support/dependencies"
module ActionDispatch
class MiddlewareStack
class Middleware
attr_reader :args, :block, :name, :classcache
def initialize(klass_or_name, *args, &block)
@klass = nil
if klass_or_name.respond_to?(:name)
@klass = klass_or_name
@name = @klass.name
else
@name = klass_or_name.to_s
end
@classcache = ActiveSupport::Dependencies::Reference
@args, @block = args, block
end
def klass
@klass || classcache[@name]
end
def ==(middleware)
case middleware
when Middleware
klass == middleware.klass
when Class
klass == middleware
else
normalize(@name) == normalize(middleware)
end
end
def inspect
klass.to_s
end
def build(app)
klass.new(app, *args, &block)
end
private
def normalize(object)
object.to_s.strip.sub(/^::/, '')
end
end
include Enumerable
attr_accessor :middlewares
def initialize(*args)
@middlewares = []
yield(self) if block_given?
end
def each
@middlewares.each { |x| yield x }
end
def size
middlewares.size
end
def last
middlewares.last
end
def [](i)
middlewares[i]
end
def unshift(*args, &block)
middleware = self.class::Middleware.new(*args, &block)
middlewares.unshift(middleware)
end
def initialize_copy(other)
self.middlewares = other.middlewares.dup
end
def insert(index, *args, &block)
index = assert_index(index, :before)
middleware = self.class::Middleware.new(*args, &block)
middlewares.insert(index, middleware)
end
alias_method :insert_before, :insert
def insert_after(index, *args, &block)
index = assert_index(index, :after)
insert(index + 1, *args, &block)
end
def swap(target, *args, &block)
index = assert_index(target, :before)
insert(index, *args, &block)
middlewares.delete_at(index + 1)
end
def delete(target)
middlewares.delete target
end
def use(*args, &block)
middleware = self.class::Middleware.new(*args, &block)
middlewares.push(middleware)
end
def build(app = nil, &block)
app ||= block
raise "MiddlewareStack#build requires an app" unless app
middlewares.freeze.reverse.inject(app) { |a, e| e.build(a) }
end
protected
def assert_index(index, where)
i = index.is_a?(Integer) ? index : middlewares.index(index)
raise "No such middleware to insert #{where}: #{index.inspect}" unless i
i
end
end
end
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