Class: Kirei::Routing::Base

Inherits:
Object
  • Object
show all
Extended by:
T::Sig
Defined in:
lib/kirei/routing/base.rb

Direct Known Subclasses

App, Controller

Constant Summary collapse

NOT_FOUND =

rubocop:disable Style/MutableConstant

T.let([404, {}, ["Not Found"]], RackResponseType)

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(params: {}) ⇒ Base

Returns a new instance of Base.



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# File 'lib/kirei/routing/base.rb', line 14

def initialize(params: {})
  @router = T.let(Router.instance, Router)
  @params = T.let(params, T::Hash[String, T.untyped])
end

Instance Attribute Details

#params ⇒ Object (readonly)

Returns the value of attribute params.



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# File 'lib/kirei/routing/base.rb', line 20

def params
  @params
end

Instance Method Details

#add_cors_headers(headers, env) ⇒ Object 



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# File 'lib/kirei/routing/base.rb', line 175

def add_cors_headers(headers, env)
  origin = T.cast(env.fetch("HTTP_ORIGIN", nil), T.nilable(String))
  return if origin.nil?

  allowed_origins = Kirei::App.config.allowed_origins
  return unless allowed_origins.include?(origin)

  headers["Access-Control-Allow-Origin"] = origin
  headers["Access-Control-Allow-Methods"] = "GET, POST, PUT, PATCH, DELETE, OPTIONS"
  headers["Access-Control-Allow-Headers"] = "Content-Type, Authorization, Referer"
  headers["Access-Control-Allow-Credentials"] = "true"
end

#call(env) ⇒ Object 



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# File 'lib/kirei/routing/base.rb', line 26

def call(env)
  start = Process.clock_gettime(Process::CLOCK_MONOTONIC, :float_millisecond)
  status = 500 # we use it in the "ensure" block, so we need to define early (Sorbet doesn't like `status ||= 418`)

  http_verb = Verb.deserialize(env.fetch("REQUEST_METHOD"))
  req_path = T.cast(env.fetch("REQUEST_PATH"), String)
  #
  # TODO: reject requests from unexpected hosts -> allow configuring allowed hosts in a `cors.rb` file
  #   ( offer a scaffold for this file )
  # -> use https://github.com/cyu/rack-cors ?
  #

  lookup_verb = http_verb == Verb::HEAD ? Verb::GET : http_verb
  route = router.get(lookup_verb, req_path)
  return NOT_FOUND if route.nil?

  router.current_env = env # expose the env to the controller

  params = case http_verb
           when Verb::GET
             query = T.cast(env.fetch("QUERY_STRING"), String)
             query.split("&").to_h do |p|
               k, v = p.split("=")
               k = T.cast(k, String)
               [k, v]
             end
           when Verb::POST, Verb::PUT, Verb::PATCH
             # TODO: based on content-type, parse the body differently
             #       built-in support for JSON & XML
             body = T.cast(env.fetch("rack.input"), T.any(IO, StringIO))
             res = Oj.load(body.read, Kirei::OJ_OPTIONS)
             body.rewind # TODO: maybe don't rewind if we don't need to?
             T.cast(res, T::Hash[String, T.untyped])
           when Verb::HEAD, Verb::DELETE, Verb::OPTIONS, Verb::TRACE, Verb::CONNECT
             {}
           else
             T.absurd(http_verb)
  end

  req_id = T.cast(env["HTTP_X_REQUEST_ID"], T.nilable(String))
  req_id ||= "req_#{App.environment}_#{SecureRandom.uuid}"
  Thread.current[:request_id] = req_id

  controller = route.controller
  before_hooks = collect_hooks(controller, :before_hooks)
  run_hooks(before_hooks)

  Kirei::Logging::Logger.call(
    level: Kirei::Logging::Level::INFO,
    label: "Request Started",
    meta: {
      "http.method" => route.verb.serialize,
      "http.route" => route.path,
      "http.host" => env.fetch("HTTP_HOST"),
      "http.request_params" => params,
      "http.client_ip" => env.fetch("CF-Connecting-IP", env.fetch("REMOTE_ADDR")),
    },
  )

  statsd_timing_tags = {
    "controller" => controller.name,
    "route" => route.action,
  }
  Logging::Metric.inject_defaults(statsd_timing_tags)

  status, headers, response_body = case http_verb
                                   when Verb::HEAD, Verb::OPTIONS, Verb::TRACE, Verb::CONNECT
                                     [200, {}, []]
                                   when Verb::GET, Verb::POST, Verb::PUT, Verb::PATCH, Verb::DELETE
                                     T.cast(
                                       controller.new(params: params).public_send(route.action),
                                       RackResponseType,
                                     )
                                   else
                                     T.absurd(http_verb)
  end

  after_hooks = collect_hooks(controller, :after_hooks)
  run_hooks(after_hooks)

  headers["X-Request-Id"] ||= req_id

  default_headers.each do |header_name, default_value|
    headers[header_name] ||= default_value
  end

  add_cors_headers(headers, env)

  [
    status,
    headers,
    response_body,
  ]
ensure
  stop = Process.clock_gettime(Process::CLOCK_MONOTONIC, :float_millisecond)
  if start # early return for 404
    latency_in_ms = stop - start
    ::StatsD.measure("request", latency_in_ms, tags: statsd_timing_tags)

    Kirei::Logging::Logger.call(
      level: status >= 500 ? Kirei::Logging::Level::ERROR : Kirei::Logging::Level::INFO,
      label: "Request Finished",
      meta: { "response.body" => response_body, "response.latency_in_ms" => latency_in_ms },
    )
  end

  # reset global variables after the request has been served
  # and after all "after" hooks have run to avoid leaking
  Thread.current[:enduser_id] = nil
  Thread.current[:request_id] = nil
end

#default_headers ⇒ Object 



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# File 'lib/kirei/routing/base.rb', line 158

def default_headers
  {
    # security relevant headers
    "X-Frame-Options" => "DENY",
    "X-Content-Type-Options" => "nosniff",
    "X-XSS-Protection" => "1; mode=block", # for legacy clients/browsers
    "Strict-Transport-Security" => "max-age=31536000; includeSubDomains", # for HTTPS
    "Cache-Control" => "no-store", # the user should set that if caching is needed
    "Referrer-Policy" => "strict-origin-when-cross-origin",
    "Content-Security-Policy" => "default-src 'none'; frame-ancestors 'none'",

    # other headers
    "Content-Type" => "application/json; charset=utf-8",
  }
end

#render(body, status: 200, headers: {}) ⇒ Object 



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# File 'lib/kirei/routing/base.rb', line 149

def render(body, status: 200, headers: {})
  [
    status,
    headers,
    [body],
  ]
end