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mastodon/app/controllers/well_known/webfinger_controller.rb

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# frozen_string_literal: true
module WellKnown
class WebfingerController < ApplicationController
def show
@account = Account.find_local!(username_from_resource)
@canonical_account_uri = @account.to_webfinger_s
@magic_key = pem_to_magic_key(@account.keypair.public_key)
respond_to do |format|
format.any(:json, :html) do
render formats: :json, content_type: 'application/jrd+json'
end
format.xml do
render content_type: 'application/xrd+xml'
end
end
rescue ActiveRecord::RecordNotFound
head 404
end
private
def username_from_resource
resource_user = resource_param
username, domain = resource_user.split('@')
if Rails.configuration.x.alternate_domains.include?(domain)
resource_user = "#{username}@#{Rails.configuration.x.local_domain}"
end
WebfingerResource.new(resource_user).username
end
def pem_to_magic_key(public_key)
modulus, exponent = [public_key.n, public_key.e].map do |component|
result = []
until component.zero?
result << [component % 256].pack('C')
component >>= 8
end
result.reverse.join
end
(['RSA'] + [modulus, exponent].map { |n| Base64.urlsafe_encode64(n) }).join('.')
end
def resource_param
params.require(:resource)
end
end
end