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# frozen_string_literal: true
require 'English'
helpers do
def outbox(type, object, recipients, add_recipients = false)
activity = {
'@context' => 'https://www.w3.org/ns/activitystreams',
'type' => type,
'actor' => ACTOR,
'object' => object
}
now = Time.now
date = now.strftime('%Y-%m-%dT%H:%M:%S.%N')
httpdate = now.utc.httpdate
basename = "#{date}.json"
activity_rel_path = File.join(type.downcase, basename)
activity_path = File.join(OUTBOX_DIR, activity_rel_path)
activity['id'] = File.join(OUTBOX_URL, activity_rel_path)
activity['published'] = httpdate
# assumes that recipient collections have been expanded by sender
# put all recipients into 'to', avoid 'cc' 'bto' 'bcc' 'audience' !!
activity['to'] = recipients if add_recipients
# save object
if activity['object'] && activity['object']['type'] && !activity['object']['id']
object = activity['object']
object['@context'] = 'https://www.w3.org/ns/activitystreams'
object_rel_path = File.join activity['object']['type'].downcase, basename
object_path = File.join OUTBOX_DIR, object_rel_path
object['id'] = File.join OUTBOX_URL, object_rel_path
object['published'] = httpdate
FileUtils.mkdir_p File.dirname(object_path)
File.open(object_path, 'w+') { |f| f.puts object.to_json }
end
# save activity
FileUtils.mkdir_p File.dirname(activity_path)
File.open(activity_path, 'w+') { |f| f.puts activity.to_json }
update_collection OUTBOX, activity['id'] if %w[Create Announce].include?(type)
# send
# https://github.com/mastodon/mastodon/blob/main/app/lib/request.rb
keypair = OpenSSL::PKey::RSA.new(File.read('private.pem'))
body = activity.to_json
sha256 = OpenSSL::Digest.new('SHA256')
digest = "SHA-256=#{sha256.base64digest(body)}"
inboxes = []
recipients.uniq.each do |url|
next if [ACTOR, 'https://www.w3.org/ns/activitystreams#Public'].include? url
actor = fetch url
next unless actor
if actor['endpoints'] and actor['endpoints']['sharedInbox']
inboxes << actor['endpoints']['sharedInbox']
elsif actor['inbox']
inboxes << actor['inbox']
end
end
inboxes.compact.uniq.each do |inbox|
uri = URI(inbox)
string = "(request-target): post #{uri.request_uri}\nhost: #{uri.host}\ndate: #{httpdate}\ndigest: #{digest}\ncontent-type: application/activity+json"
signature = Base64.strict_encode64(keypair.sign(OpenSSL::Digest.new('SHA256'), string))
signed_header = "keyId=\"#{ACTOR}#main-key\",algorithm=\"rsa-sha256\",headers=\"(request-target) host date digest content-type\",signature=\"#{signature}\""
curl(
"-X POST -H 'Content-Type: application/activity+json' -H 'Host: #{uri.host}' -H 'Date: #{httpdate}' -H 'Digest: #{digest}' -H 'Signature: #{signed_header}' -d '#{body}'", inbox
)
end
activity
end
def update_collection(path, objects, delete = false)
objects = [objects] unless objects.is_a? Array
File.open(path, 'r+') do |f|
f.flock(File::LOCK_EX)
json = f.read
collection = JSON.parse(json)
objects.each do |object|
id = object['id'] || object
if delete
collection['orderedItems'].delete_if { |o| o['id'] == id or o == id }
else
ids = collection['orderedItems'].collect { |i| i['id'] }
collection['orderedItems'] << object unless ids.include?(id) or collection['orderedItems'].include?(id)
end
end
collection['totalItems'] = collection['orderedItems'].size
f.rewind
f.puts collection.to_json
f.truncate(f.pos)
end
end
def fetch(url, accept = 'application/activity+json')
uri = URI(url)
httpdate = Time.now.utc.httpdate
keypair = OpenSSL::PKey::RSA.new(File.read('private.pem'))
string = "(request-target): get #{uri.request_uri}\nhost: #{uri.host}\ndate: #{httpdate}"
signature = Base64.strict_encode64(keypair.sign(OpenSSL::Digest.new('SHA256'), string))
signed_header = "keyId=\"#{ACTOR}#main-key\",algorithm=\"rsa-sha256\",headers=\"(request-target) host date\",signature=\"#{signature}\""
response = curl(
"-H 'Accept: #{accept}' -H 'Host: #{uri.host}' -H 'Date: #{httpdate}' -H 'Signature: #{signed_header}' ", url
)
response ? JSON.parse(response) : nil
end
def curl(ext, url)
p url
# p "/run/current-system/sw/bin/curl --fail-with-body -sSL #{ext} #{url}"
response = `/run/current-system/sw/bin/curl --fail-with-body -sSL #{ext} #{url}`
if $CHILD_STATUS.success?
response
else
p response
nil
end
end
def mention(actor)
person = people.select { |p| p[1] == actor }
if person.empty?
a = fetch(actor)
return nil unless a
mention = "#{a['preferredUsername']}@#{URI(actor).host}"
cache mention, actor, a
mention
else
person[0][0]
end
end
def actor(mention)
mention = mention.sub(/^@/, '').chomp
actors = people.select { |p| p[0] == mention }
if actors.empty?
_, server = mention.split('@')
a = fetch("https://#{server}/.well-known/webfinger?resource=acct:#{mention}", 'application/jrd+json')
return nil unless a
actor = a['links'].select do |l|
l['rel'] == 'self'
end[0]['href']
cache mention, actor, a
actor
else
actors[0][1]
end
end
def people
File.read('private/people.tsv').split("\n").collect { |l| l.chomp.split("\t") }
end
def cache(mention, actor, a)
sharedInbox = a['endpoints']['sharedInbox'] if a['endpoints'] && a['endpoints']['sharedInbox']
File.open('private/people.tsv', 'a') { |f| f.puts "#{mention}\t#{actor}\t#{sharedInbox}" }
end
end
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