module Middleware

module Versioner

# 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'

class Param < Base

def before

potential_version = query_params[parameter_key]

return if potential_version.blank?

version_not_found! unless potential_version_match?(potential_version)

env[Grape::Env::API_VERSION] = env[Rack::RACK_REQUEST_QUERY_HASH].delete(parameter_key)

end

end

end

end