114 lines
2.4 KiB
Ruby
114 lines
2.4 KiB
Ruby
require "active_support/inflector/methods"
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require "active_support/dependencies"
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module ActionDispatch
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class MiddlewareStack
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class Middleware
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attr_reader :args, :block, :klass
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def initialize(klass, args, block)
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@klass = klass
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@args = args
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@block = block
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end
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def name; klass.name; end
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def ==(middleware)
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case middleware
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when Middleware
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klass == middleware.klass
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when Class
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klass == middleware
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end
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end
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def inspect
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if klass.is_a?(Class)
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klass.to_s
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else
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klass.class.to_s
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end
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end
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def build(app)
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klass.new(app, *args, &block)
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end
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end
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include Enumerable
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attr_accessor :middlewares
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def initialize(*args)
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@middlewares = []
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yield(self) if block_given?
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end
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def each
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@middlewares.each { |x| yield x }
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end
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def size
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middlewares.size
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end
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def last
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middlewares.last
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end
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def [](i)
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middlewares[i]
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end
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def unshift(klass, *args, &block)
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middlewares.unshift(build_middleware(klass, args, block))
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end
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def initialize_copy(other)
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self.middlewares = other.middlewares.dup
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end
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def insert(index, klass, *args, &block)
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index = assert_index(index, :before)
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middlewares.insert(index, build_middleware(klass, args, block))
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end
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alias_method :insert_before, :insert
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def insert_after(index, *args, &block)
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index = assert_index(index, :after)
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insert(index + 1, *args, &block)
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end
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def swap(target, *args, &block)
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index = assert_index(target, :before)
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insert(index, *args, &block)
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middlewares.delete_at(index + 1)
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end
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def delete(target)
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middlewares.delete_if { |m| m.klass == target }
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end
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def use(klass, *args, &block)
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middlewares.push(build_middleware(klass, args, block))
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end
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def build(app = Proc.new)
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middlewares.freeze.reverse.inject(app) { |a, e| e.build(a) }
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end
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private
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def assert_index(index, where)
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i = index.is_a?(Integer) ? index : middlewares.index { |m| m.klass == index }
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raise "No such middleware to insert #{where}: #{index.inspect}" unless i
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i
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end
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def build_middleware(klass, args, block)
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Middleware.new(klass, args, block)
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end
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end
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end
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