app/controllers/api_controller.rb

   1 # frozen_string_literal: true
   2
   3 class ApiController < ApplicationController
   4   DEFAULT_STATUSES_LIMIT = 20
   5   DEFAULT_ACCOUNTS_LIMIT = 40
   6
   7   protect_from_forgery with: :null_session
   8
   9   skip_before_action :verify_authenticity_token
  10
  11   before_action :set_rate_limit_headers
  12
  13   rescue_from ActiveRecord::RecordInvalid do |e|
  14     render json: { error: e.to_s }, status: 422
  15   end
  16
  17   rescue_from ActiveRecord::RecordNotFound do
  18     render json: { error: 'Record not found' }, status: 404
  19   end
  20
  21   rescue_from Goldfinger::Error do
  22     render json: { error: 'Remote account could not be resolved' }, status: 422
  23   end
  24
  25   rescue_from HTTP::Error do
  26     render json: { error: 'Remote data could not be fetched' }, status: 503
  27   end
  28
  29   rescue_from OpenSSL::SSL::SSLError do
  30     render json: { error: 'Remote SSL certificate could not be verified' }, status: 503
  31   end
  32
  33   def doorkeeper_unauthorized_render_options(error: nil)
  34     { json: { error: (error.try(:description) || 'Not authorized') } }
  35   end
  36
  37   def doorkeeper_forbidden_render_options(*)
  38     { json: { error: 'This action is outside the authorized scopes' } }
  39   end
  40
  41   protected
  42
  43   def set_rate_limit_headers
  44     return if request.env['rack.attack.throttle_data'].nil?
  45
  46     now        = Time.now.utc
  47     match_data = request.env['rack.attack.throttle_data']['api']
  48
  49     response.headers['X-RateLimit-Limit']     = match_data[:limit].to_s
  50     response.headers['X-RateLimit-Remaining'] = (match_data[:limit] - match_data[:count]).to_s
  51     response.headers['X-RateLimit-Reset']     = (now + (match_data[:period] - now.to_i % match_data[:period])).iso8601(6)
  52   end
  53
  54   def set_pagination_headers(next_path = nil, prev_path = nil)
  55     links = []
  56     links << [next_path, [%w(rel next)]] if next_path
  57     links << [prev_path, [%w(rel prev)]] if prev_path
  58     response.headers['Link'] = LinkHeader.new(links)
  59   end
  60
  61   def current_resource_owner
  62     @current_user ||= User.find(doorkeeper_token.resource_owner_id) if doorkeeper_token
  63   end
  64
  65   def current_user
  66     super || current_resource_owner
  67   rescue ActiveRecord::RecordNotFound
  68     nil
  69   end
  70
  71   def require_user!
  72     current_resource_owner
  73   rescue ActiveRecord::RecordNotFound
  74     render json: { error: 'This method requires an authenticated user' }, status: 422
  75   end
  76
  77   def render_empty
  78     render json: {}, status: 200
  79   end
  80
  81   def set_maps(statuses) # rubocop:disable Style/AccessorMethodName
  82     if current_account.nil?
  83       @reblogs_map    = {}
  84       @favourites_map = {}
  85       return
  86     end
  87
  88     status_ids      = statuses.flat_map { |s| [s.id, s.reblog_of_id] }.compact.uniq
  89     @reblogs_map    = Status.reblogs_map(status_ids, current_account)
  90     @favourites_map = Status.favourites_map(status_ids, current_account)
  91   end
  92
  93   def set_counters_maps(statuses) # rubocop:disable Style/AccessorMethodName
  94     status_ids             = statuses.map { |s| s.reblog? ? s.reblog_of_id : s.id }.uniq
  95     @favourites_counts_map = Favourite.select('status_id, COUNT(id) AS favourites_count').group('status_id').where(status_id: status_ids).map { |f| [f.status_id, f.favourites_count] }.to_h
  96     @reblogs_counts_map    = Status.select('statuses.id, COUNT(reblogs.id) AS reblogs_count').joins('LEFT OUTER JOIN statuses AS reblogs ON statuses.id = reblogs.reblog_of_id').where(id: status_ids).group('statuses.id').map { |r| [r.id, r.reblogs_count] }.to_h
  97   end
  98
  99   def set_account_counters_maps(accounts) # rubocop:disable Style/AccessorMethodName
 100     account_ids = accounts.map(&:id)
 101     @followers_counts_map = Follow.unscoped.select('target_account_id, COUNT(account_id) AS followers_count').group('target_account_id').where(target_account_id: account_ids).map { |f| [f.target_account_id, f.followers_count] }.to_h
 102     @following_counts_map = Follow.unscoped.select('account_id, COUNT(target_account_id) AS following_count').group('account_id').where(account_id: account_ids).map { |f| [f.account_id, f.following_count] }.to_h
 103     @statuses_counts_map  = Status.unscoped.select('account_id, COUNT(id) AS statuses_count').group('account_id').where(account_id: account_ids).map { |s| [s.account_id, s.statuses_count] }.to_h
 104   end
 105 end