Class: Grape::Middleware::Versioner::AcceptVersionHeader

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

Overview

This middleware sets various version related rack environment variables based on the HTTP Accept-Version header

Example: For request header Accept-Version: v1

The following rack env variables are set:

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

If version does not match this route, then a 406 is raised with X-Cascade header to alert Rack::Mount to attempt the next matched route.

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, #default_options, #initialize, #mime_types, #response

Constructor Details

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

Instance Method Details

#beforeObject


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# File 'lib/grape/middleware/versioner/accept_version_header.rb', line 20

def before
  potential_version = (env['HTTP_ACCEPT_VERSION'] || '').strip

  if strict?
    # If no Accept-Version header:
    if potential_version.empty?
      throw :error, status: 406, headers: error_headers, message: 'Accept-Version header must be set.'
    end
  end

  unless potential_version.empty?
    # If the requested version is not supported:
    unless versions.any? { |v| v.to_s == potential_version }
      throw :error, status: 406, headers: error_headers, message: 'The requested version is not supported.'
    end

    env['api.version'] = potential_version
  end
end