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module Rack
class MethodOverride
HTTP_METHODS = %w(GET HEAD PUT POST DELETE OPTIONS PATCH LINK UNLINK)
METHOD_OVERRIDE_PARAM_KEY = "_method".freeze
HTTP_METHOD_OVERRIDE_HEADER = "HTTP_X_HTTP_METHOD_OVERRIDE".freeze
ALLOWED_METHODS = ["POST"]
def initialize(app)
@app = app
end
def call(env)
if allowed_methods.include?(env[REQUEST_METHOD])
method = method_override(env)
if HTTP_METHODS.include?(method)
env["rack.methodoverride.original_method"] = env[REQUEST_METHOD]
env[REQUEST_METHOD] = method
end
end
@app.call(env)
end
def method_override(env)
req = Request.new(env)
method = method_override_param(req) ||
env[HTTP_METHOD_OVERRIDE_HEADER]
method.to_s.upcase
end
private
def allowed_methods
ALLOWED_METHODS
end
def method_override_param(req)
req.POST[METHOD_OVERRIDE_PARAM_KEY]
end
end
end