Adding OAuth access scopes, fixing OAuth authorization UI, adding rate limiting

to the API

config/environments/production.rb

@@ -12,7 +12,7 @@ Rails.application.configure do
 
   # Full error reports are disabled and caching is turned on.
   config.consider_all_requests_local       = false
-  config.action_controller.perform_caching = false
+  config.action_controller.perform_caching = true
 
   # Disable serving static files from the `/public` folder by default since
   # Apache or NGINX already handles this.

config/initializers/doorkeeper.rb

@@ -50,8 +50,8 @@ Doorkeeper.configure do
   # Define access token scopes for your provider
   # For more information go to
   # https://github.com/doorkeeper-gem/doorkeeper/wiki/Using-Scopes
-  # default_scopes  :public
-  # optional_scopes :write, :follow
+  default_scopes  :read
+  optional_scopes :write, :follow
 
   # Change the way client credentials are retrieved from the request object.
   # By default it retrieves first from the `HTTP_AUTHORIZATION` header, then

config/initializers/rabl_init.rb

@@ -1,5 +1,5 @@
 Rabl.configure do |config|
-  config.cache_all_output  = true
+  config.cache_all_output  = false
   config.cache_sources     = !!Rails.env.production?
   config.include_json_root = false
   config.view_paths        = [Rails.root.join('app/views')]

config/initializers/rack-attack.rb

@@ -1,9 +1,19 @@
 class Rack::Attack
-  throttle('get-req/ip', limit: 300, period: 5.minutes) do |req|
-    req.ip if req.get?
+  # Rate limits for the API
+  throttle('api', limit: 150, period: 5.minutes) do |req|
+    req.ip if req.path.match(/\A\/api\//)
   end
 
-  throttle('post-req/ip', limit: 100, period: 5.minutes) do |req|
-    req.ip if req.post?
+  self.throttled_response = lambda do |env|
+    now        = Time.now.utc
+    match_data = env['rack.attack.match_data']
+
+    headers = {
+      'X-RateLimit-Limit'     => match_data[:limit].to_s,
+      'X-RateLimit-Remaining' => '0',
+      'X-RateLimit-Reset'     => (now + (match_data[:period] - now.to_i % match_data[:period])).to_s
+    }
+
+    [429, headers, [{ error: 'Throttled' }.to_json]]
   end
 end

config/locales/doorkeeper.en.yml

@@ -15,6 +15,10 @@ en:
               secured_uri: 'must be an HTTPS/SSL URI.'
 
   doorkeeper:
+    scopes:
+      read: read your account's data
+      write: post on your behalf
+      follow: follow, block, unblock and unfollow accounts
     applications:
       confirmations:
         destroy: 'Are you sure?'

config/routes.rb

@@ -7,7 +7,9 @@ Rails.application.routes.draw do
     mount Sidekiq::Web => '/sidekiq'
   end
 
-  use_doorkeeper
+  use_doorkeeper do
+    controllers authorizations: 'oauth/authorizations'
+  end
 
   get '.well-known/host-meta', to: 'xrd#host_meta', as: :host_meta
   get '.well-known/webfinger', to: 'xrd#webfinger', as: :webfinger