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# server-server
post '/inbox' do
request.body.rewind # in case someone already read it
@body = request.body.read
begin
@activity = JSON.parse @body
rescue StandardError => e
p e, @body
halt 400
end
# deleted actors return 403 => verification error
halt 200 if @activity['type'] == 'Delete' and @activity['actor'] == @activity['object']
verify! # pixelfed sends unsigned activities???
handle_activity
200
end
# public
get '/' do
redirect 'https://social.pdp8.info/outbox'
end
get '/outbox', provides: 'html' do
@activities = public_outbox
erb :outbox
end
get '/outbox' do
ids = public_outbox.collect { |a| a['id'] }
{ '@context' => 'https://www.w3.org/ns/activitystreams',
'id' => 'https://social.pdp8.info/outbox',
'type' => 'OrderedCollection',
'totalItems' => ids.size,
'orderedItems' => ids }.to_json
end
get '/pdp8', provides: 'html' do
redirect 'https://social.pdp8.info/outbox'
end
get '/pdp8' do
send_file(File.join(PUBLIC_DIR, 'pdp8.json'), type: CONTENT_TYPE)
end
get '/.well-known/webfinger' do
halt 404 unless request['resource'] == "acct:#{MENTION}"
send_file(WEBFINGER, type: 'application/jrd+json')
end
['/following', '/followers'].each do |path|
get path do
send_file(File.join(PUBLIC_DIR, path) + '.json', type: CONTENT_TYPE)
end
end
get '/tags/:tag' do |tag|
send_file(File.join(PUBLIC_DIR, 'tags', tag) + '.json', type: CONTENT_TYPE)
end
helpers do
def create
@count ||= 0
@object ||= @activity['object']
save_inbox_object
return unless @object and @object['inReplyTo'] and @count < 5
# recursive thread download
@object = @object['inReplyTo']
@count += 1
create
end
def announce
@object ||= @activity['object']
@object = fetch(@object) if @object.is_a? String and @object.match(/^http/)
@object['announce'] = @activity['actor'] if @object
create
end
def like
announce
end
def follow
save_item @activity, File.join(INBOX[:dir], @activity['type'].downcase, activity_name)
update_collection FOLLOWERS, @activity['actor']
create_activity 'Accept', @activity, [@activity['actor']]
end
def accept
save_item @activity, File.join(INBOX[:dir], @activity['type'].downcase, activity_name)
if @activity['object']['type'] == 'Follow'
update_collection FOLLOWING, @activity['object']['object']
else
p "Cannot accept @activity['object']['type']"
jj @activity
halt 501
end
end
def undo
case @activity['object']['type']
when 'Follow'
update_collection FOLLOWERS, @activity['object']['actor'], 'delete'
when 'Create', 'Announce'
file = find_file @activity['object']['object']
FileUtils.rm(file) if file and File.exist? file
else
p "Cannot undo @activity['object']['type']"
jj @activity
halt 501
end
end
def update
file = find_file(@activity['object']['id'])
FileUtils.rm(file) if file and File.exist? file
create
end
def delete
file = find_file(@activity['object']['id'])
FileUtils.rm(file) if file and File.exist? file
end
def move
create_activity 'Follow', @activity['target'], [@activity['target']] if @activity['actor'] == @activity['object']
end
def handle_activity
type = @activity['type'].downcase.to_sym
save_item @activity, File.join(INBOX[:dir], @activity['type'].downcase, activity_name)
if ACTIVITIES.include? type
send(type)
else
unless %w[Add Remove].include? @activity['type']
p "Unknown activity #{type}:"
jj @activity
end
end
end
def activity_name
@activity['published'] ? "#{@activity['published']}_#{mention(@activity['actor'])}.json" : "#{Time.now.utc.iso8601}_#{mention(@activity['actor'])}.json"
end
def save_inbox_object
@object = @object['object'] if @object['type'] and ACTIVITIES.include? @object['type'].downcase.to_sym # lemmy
return unless @object and @object['type'] != 'Person'
@object = fetch(@object) if @object.is_a? String and @object.match(/^http/)
return unless @object
if @activity['type'] != 'Update' && (@object['id'] and File.readlines(VISITED, chomp: true).include? @object['id'])
return
end
save_item @object, File.join(INBOX[:dir], 'object', @object['type'].downcase, activity_name)
File.open(File.join(INBOX[:dir], 'visited'), 'a+') { |f| f.puts @object['id'] }
end
def public_outbox
create = Dir[File.join('outbox', 'create', '*.json')].collect do |f|
JSON.load_file(f)
end.select { |a| a['to'].include?('https://www.w3.org/ns/activitystreams#Public') }.sort_by { |a| a['published'] }.reverse
announce = Dir[File.join('outbox', 'announce', '*.json')].collect do |f|
JSON.load_file(f)
end.select { |a| a['to'].include?('https://www.w3.org/ns/activitystreams#Public') }.sort_by { |a| a['published'] }.reverse
create + announce
end
# 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)}"
unless digest == request.env['HTTP_DIGEST']
p 'invalid digest'
p @body
halt 403
end
# 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
unless actor
p 'no actor'
jj @activity
halt 403
end
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")
return if key.verify(OpenSSL::Digest.new('SHA256'), signature, comparison)
p 'verification failed'
p signature_params
p actor['publicKey']
p signature, comparison
jj @activity
# halt 403
end
end
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