/
base.rb
92 lines (76 loc) · 2.33 KB
/
base.rb
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require 'grape/dsl/headers'
module Grape
module Middleware
class Base
attr_reader :app, :env, :options
TEXT_HTML = 'text/html'.freeze
include Grape::DSL::Headers
# @param [Rack Application] app The standard argument for a Rack middleware.
# @param [Hash] options A hash of options, simply stored for use by subclasses.
def initialize(app, **options)
@app = app
@options = default_options.merge(**options)
end
def default_options
{}
end
def call(env)
dup.call!(env)
end
def call!(env)
@env = env
before
begin
@app_response = @app.call(@env)
ensure
begin
after_response = after
rescue StandardError => e
warn "caught error of type #{e.class} in after callback inside #{self.class.name} : #{e.message}"
raise e
end
end
response = after_response || @app_response
merge_headers response
response
end
# @abstract
# Called before the application is called in the middleware lifecycle.
def before
end
# @abstract
# Called after the application is called in the middleware lifecycle.
# @return [Response, nil] a Rack SPEC response or nil to call the application afterwards.
def after
end
def response
return @app_response if @app_response.is_a?(Rack::Response)
Rack::Response.new(@app_response[2], @app_response[0], @app_response[1])
end
def content_type_for(format)
HashWithIndifferentAccess.new(content_types)[format]
end
def content_types
ContentTypes.content_types_for(options[:content_types])
end
def content_type
content_type_for(env[Grape::Env::API_FORMAT] || options[:format]) || TEXT_HTML
end
def mime_types
types_without_params = {}
content_types.each_pair do |k, v|
types_without_params[v.split(';').first] = k
end
types_without_params
end
private
def merge_headers(response)
return unless headers.is_a?(Hash)
case response
when Rack::Response then response.headers.merge!(headers)
when Array then response[1].merge!(headers)
end
end
end
end
end