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|
#!/usr/bin/env ruby
require 'bundler/inline'
gemfile do
source 'https://rubygems.org'
gem "csv", "~> 3.0"
gem "declarative_policy", "~> 1.0"
gem "erb", "~> 4.0"
gem "globalid", "~> 1.0"
gem "google-protobuf", "~> 3.0"
gem "json", "~> 2.0"
gem "logger", "~> 1.0"
gem "rack", "~> 3.0"
gem "rackup", "~> 2.0"
gem "securerandom", "~> 0.1"
gem "twirp", "~> 1.0"
gem "webrick", "~> 1.0"
end
lib_path = Pathname.new(__FILE__).parent.parent.join('lib').realpath.to_s
$LOAD_PATH.unshift(lib_path) unless $LOAD_PATH.include?(lib_path)
require 'authx/rpc'
$scheme = ENV.fetch("SCHEME", "http")
$port = ENV.fetch("PORT", 8284).to_i
$host = ENV.fetch("HOST", "localhost:#{$port}")
class Entity
class << self
def all
@items ||= ::CSV.read(File.join(__dir__, "../db/#{self.name.downcase}s.csv"), headers: true).map do |row|
new(row.to_h.transform_keys(&:to_sym))
end
end
def create!(attributes)
new({ id: SecureRandom.uuid }.merge(attributes)).tap do |item|
all << item
end
end
end
def initialize(attributes = {})
@attributes = attributes
end
def id
self[:id]
end
def [](attribute)
@attributes.fetch(attribute.to_sym)
end
def to_h
@attributes
end
def to_gid
::GlobalID.create(self, app: "example")
end
end
class Organization < Entity
class << self
def default
@default ||= all.find { |organization| organization[:name] == "default" }
end
end
end
class Group < Entity
end
class Project < Entity
end
module HTTPHelpers
def authorized?(request, permission, resource)
raise [permission, resource].inspect if resource.nil?
authorization = Rack::Auth::AbstractRequest.new(request.env)
return false unless authorization.provided?
response = rpc.allowed({
subject: authorization.params,
permission: permission,
resource: resource.to_gid.to_s,
}, headers: { 'Authorization' => "Bearer #{authorization.params}"})
puts [response&.data&.result, permission, resource.to_gid.to_s].inspect
response.error.nil? && response.data.result
end
def json_not_found
http_response(code: 404)
end
def json_ok(body)
http_response(code: 200, body: JSON.pretty_generate(body))
end
def json_created(body)
http_response(code: 201, body: JSON.pretty_generate(body.to_h))
end
def json_unauthorized(permission, resource)
http_response(code: 401, body: JSON.pretty_generate({
error: {
code: 401,
message: "`#{permission}` is required on `#{resource.to_gid}`",
}
}))
end
def http_response(code:, headers: { 'Content-Type' => 'application/json' }, body: nil)
[
code,
headers.merge({ 'X-Backend-Server' => 'REST' }),
[body].compact
]
end
end
class API
include HTTPHelpers
attr_reader :rpc
def initialize
@rpc = ::Authx::Rpc::AbilityClient.new("http://idp.example.com:8080/twirp")
end
def call(env)
request = Rack::Request.new(env)
case request.request_method
when Rack::GET
case request.path
when "/organizations", "/organizations.json"
return json_ok(Organization.all.map(&:to_h))
when "/groups", "/groups.json"
resource = Organization.default
if authorized?(request, :read_group, resource)
return json_ok(Group.all.map(&:to_h))
else
return json_unauthorized(:read_group, resource)
end
when "/projects", "/projects.json"
resource = Organization.default
if authorized?(request, :read_project, resource)
return json_ok(Project.all.map(&:to_h))
else
return json_unauthorized(:read_project, resource)
end
end
when Rack::POST
case request.path
when "/projects", "/projects.json"
resource = Organization.default
if authorized?(request, :create_project, resource)
return json_created(Project.create!(JSON.parse(request.body.read, symbolize_names: true)))
else
return json_unauthorized(:create_project, resource)
end
end
end
json_not_found
end
private
end
if __FILE__ == $0
app = Rack::Builder.new do
use Rack::CommonLogger
use Rack::Reloader
run API.new
end.to_app
Rackup::Server.start(app: app, Port: $port)
end
|
