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# frozen_string_literal: true
require 'grape/middleware/base'
module Grape
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 default_options
{
version_options: {
parameter: 'apiver'
}
}
end
def before
potential_version = Rack::Utils.parse_nested_query(env[Grape::Http::Headers::QUERY_STRING])[paramkey]
return if potential_version.nil?
throw :error, status: 404, message: '404 API Version Not Found', headers: { Grape::Http::Headers::X_CASCADE => 'pass' } if options[:versions] && !options[:versions].find { |v| v.to_s == potential_version }
env[Grape::Env::API_VERSION] = potential_version
env[Grape::Env::RACK_REQUEST_QUERY_HASH].delete(paramkey) if env.key? Grape::Env::RACK_REQUEST_QUERY_HASH
end
private
def paramkey
version_options[:parameter] || default_options[:version_options][:parameter]
end
def version_options
options[:version_options]
end
end
end
end
end
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