# frozen_string_literal: true

class UserApiKey < ActiveRecord::Base
  self.ignored_columns = [
    "scopes" # TODO(2020-12-18): remove
  ]

  SCOPES = {
    read: [:get],
    write: [:get, :post, :patch, :put, :delete],
    message_bus: [[:post, 'message_bus']],
    push: nil,
    one_time_password: nil,
    notifications: [[:post, 'message_bus'], [:get, 'notifications#index'], [:put, 'notifications#mark_read']],
    session_info: [
      [:get, 'session#current'],
      [:get, 'users#topic_tracking_state'],
      [:get, 'list#unread'],
      [:get, 'list#new'],
      [:get, 'list#latest']
    ]
  }

  belongs_to :user
  has_many :scopes, class_name: "UserApiKeyScope", dependent: :destroy

  scope :active, -> { where(revoked_at: nil) }
  scope :with_key, ->(key) { where(key_hash: ApiKey.hash_key(key)) }

  after_initialize :generate_key

  def generate_key
    if !self.key_hash
      @key ||= SecureRandom.hex
      self.key_hash = ApiKey.hash_key(@key)
    end
  end

  def key
    raise ApiKey::KeyAccessError.new "API key is only accessible immediately after creation" unless key_available?
    @key
  end

  def key_available?
    @key.present?
  end

  # Scopes allowed to be requested by external services
  def self.allowed_scopes
    Set.new(SiteSetting.allow_user_api_key_scopes.split("|"))
  end

  def self.available_scopes
    @available_scopes ||= Set.new(SCOPES.keys.map(&:to_s))
  end

  def self.allow_permission?(permission, env)
    verb, action = permission
    actual_verb = env["REQUEST_METHOD"] || ""

    return false unless actual_verb.downcase == verb.to_s
    return true unless action

    # not a rails route, special handling
    return true if action == "message_bus" && env["PATH_INFO"] =~ /^\/message-bus\/.*\/poll/

    params = env['action_dispatch.request.path_parameters']

    return false unless params

    actual_action = "#{params[:controller]}##{params[:action]}"
    actual_action == action
  end

  def self.allow_scope?(name, env)
    if allowed = SCOPES[name.to_sym]
      good = allowed.any? do |permission|
        allow_permission?(permission, env)
      end

      good || allow_permission?([:post, 'user_api_keys#revoke'], env)
    end
  end

  def has_push?
    scopes.any? { |s| s.name == "push" || s.name == "notifications" } &&
      push_url.present? &&
      SiteSetting.allowed_user_api_push_urls.include?(push_url)
  end

  def allow?(env)
    scopes.any? do |s|
      UserApiKey.allow_scope?(s.name, env)
    end || is_revoke_self_request?(env)
  end

  def self.invalid_auth_redirect?(auth_redirect)
    SiteSetting.allowed_user_api_auth_redirects
      .split('|')
      .none? { |u| WildcardUrlChecker.check_url(u, auth_redirect) }
  end

  private

  def is_revoke_self_request?(env)
    UserApiKey.allow_permission?([:post, 'user_api_keys#revoke'], env) && (env[:id].nil? || env[:id].to_i == id)
  end
end

# == Schema Information
#
# Table name: user_api_keys
#
#  id               :integer          not null, primary key
#  user_id          :integer          not null
#  client_id        :string           not null
#  application_name :string           not null
#  push_url         :string
#  created_at       :datetime         not null
#  updated_at       :datetime         not null
#  revoked_at       :datetime
#  scopes           :text             default([]), not null, is an Array
#  last_used_at     :datetime         not null
#  key_hash         :string           not null
#
# Indexes
#
#  index_user_api_keys_on_client_id  (client_id) UNIQUE
#  index_user_api_keys_on_key_hash   (key_hash) UNIQUE
#  index_user_api_keys_on_user_id    (user_id)
#