Class: Grape::Middleware::Versioner::Param

Inherits:
Base
  • Object
show all
Defined in:
lib/grape/middleware/versioner/param.rb

Overview

This middleware sets various version related rack environment variables based on the request parameters and removes that parameter from the request parameters for subsequent middleware and API. If the version substring does not match any potential initialized versions, a 404 error is thrown. If the version substring is not passed the version (highest mounted) version will be used.

Example: For a uri path /resource?apiver=v1

The following rack env variables are set and path is rewritten to '/resource':

env['api.version'] => 'v1'

Instance Attribute Summary

Attributes inherited from Base

#app, #env, #options

Instance Method Summary (collapse)

Methods inherited from Base

#after, #call, #call!, #content_type, #content_type_for, #content_types, #initialize, #mime_types, #response

Constructor Details

This class inherits a constructor from Grape::Middleware::Base

Instance Method Details

- (Object) before



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# File 'lib/grape/middleware/versioner/param.rb', line 28

def before
  paramkey = options[:parameter]
  potential_version = Rack::Utils.parse_nested_query(env['QUERY_STRING'])[paramkey]
  unless potential_version.nil?
    if options[:versions] && !options[:versions].find { |v| v.to_s == potential_version }
      throw :error, status: 404, message: "404 API Version Not Found", headers: { 'X-Cascade' => 'pass' }
    end
    env['api.version'] = potential_version
    env['rack.request.query_hash'].delete(paramkey) if env.key? 'rack.request.query_hash'
  end
end

- (Object) default_options



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# File 'lib/grape/middleware/versioner/param.rb', line 22

def default_options
  {
    parameter: "apiver"
  }
end