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# frozen_string_literal: true
# server-server
post '/inbox' do
request.body.rewind # in case someone already read it
@body = request.body.read
halt 400 if @body.empty?
begin
@activity = JSON.parse @body
rescue StandardError
p @body
halt 400
end
type = @activity['type'].downcase.to_sym
p type
halt 501 unless respond_to?(type)
@object = @activity['object']
@object = fetch(@object) if @object.is_a?(String) && @object.match(/^http/)
halt 400 unless @object
verify!
send(type)
end
# public
get '/.well-known/webfinger' do
if request['resource'] == "acct:#{MENTION}"
send_file('./public/webfinger',
type: 'application/jrd+json')
else
halt 404
end
end
get '/outbox' do
ordered_collection(OUTBOX_DIR).to_json
end
['/following', '/followers'].each do |path|
get path do
ordered_collection(File.join(PUBLIC_DIR, path)).to_json
end
end
get '/tags/:tag' do |tag|
ordered_collection(File.join(TAGS, tag)).to_json
end
helpers do
# https://github.com/mastodon/mastodon/blob/main/app/controllers/concerns/signature_verification.rb
def verify!
# digest
sha256 = OpenSSL::Digest.new('SHA256')
digest = "SHA-256=#{sha256.base64digest(@body)}"
halt 403 unless digest == request.env['HTTP_DIGEST']
# signature
signature_params = {}
request.env['HTTP_SIGNATURE'].split(',').each do |pair|
k, v = pair.split('=')
signature_params[k] = v.gsub('"', '')
end
key_id = signature_params['keyId']
headers = signature_params['headers']
signature = Base64.decode64(signature_params['signature'])
actor = fetch key_id
halt 403 unless actor
key = OpenSSL::PKey::RSA.new(actor['publicKey']['publicKeyPem'])
comparison = headers.split(' ').map do |signed_params_name|
if signed_params_name == '(request-target)'
'(request-target): post /inbox'
elsif signed_params_name == 'content-type'
"#{signed_params_name}: #{request.env['CONTENT_TYPE']}"
else
"#{signed_params_name}: #{request.env["HTTP_#{signed_params_name.upcase}"]}"
end
end.join("\n")
halt 403 unless key.verify(OpenSSL::Digest.new('SHA256'), signature, comparison)
end
def create
return unless @object
return if object_exists?
File.open(object_file, 'w+') { |f| f.puts @object.to_json }
return unless @object['inReplyTo']
@object = fetch @object['inReplyTo']
create if @object
end
def announce
create
end
def follow
File.open(File.join(FOLLOWERS, "#{mention(@activity['actor'])}.json"), 'w+') { |f| f.puts @body }
outbox 'Accept', @activity, [@activity['actor']]
end
def accept
return unless @object['type'] == 'Follow'
File.open(File.join(FOLLOWING_DIR, "#{mention(@object['object'])}.json"), 'w+') { |f| f.puts @object.to_json }
end
def undo
return unless @object['type'] == 'Follow'
Dir[File.join(FOLLOWERS, '*.json')].each do |follower|
FileUtils.rm follower if JSON.parse(File.read(follower))['actor'] == @object['actor']
end
end
def inbox
Dir[File.join(INBOX_DIR, 'note', '*.json')].collect do |file|
JSON.parse(File.read(file))
end.sort_by { |o| o['published'] }
end
def object_exists?
!inbox.select { |o| o['id'] == @object['id'] }.empty?
end
def object_file
dir = File.join 'inbox', @object['type'].downcase
FileUtils.mkdir_p dir
File.join dir, "#{Time.now.strftime('%Y-%m-%dT%H:%M:%S.%N')}.json"
end
def ordered_collection(dir)
posts = Dir[File.join(dir, '*.json')].collect { |f| JSON.parse(File.read(f)) }.sort_by { |o| o['published'] }
{
'@context' => 'https://www.w3.org/ns/activitystreams',
'summary' => "#{USER} #{dir}",
'type' => 'OrderedCollection',
'totalItems' => posts.size,
'orderedItems' => posts
}
end
end
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