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before '/inbox' do
request.body.rewind # in case someone already read it
@body = request.body.read
@activity = JSON.parse @body
@object = @activity['object']
@object = fetch(@object) if @object.is_a? String and @object.match(/^http/)
end
# client-server
post '/outbox' do
protected!
#send_signed @activity
end
# server-server
post "/inbox" do
verify!
type = @activity['type'].downcase.to_sym
respond_to?(type) ? send(type) : p("Unknown activity: #{type}")
end
# public
get "/.well-known/webfinger" do
request["resource"] == "acct:#{ACCOUNT}" ? send_file("./public/webfinger", :type => "application/jrd+json") : halt(404)
end
["/outbox","/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!
# verify digest
sha256 = OpenSSL::Digest::SHA256.new
digest = "SHA-256=" + sha256.base64digest(@body)
halt 403 unless digest == request.env["HTTP_DIGEST"]
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
if not actor and @activity["type"] == "Delete" # deleted users do not return actors
halt 200
end
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
unless object_exists?
File.open(object_file, "w+") { |f| f.puts @object.to_json }
if @object and @object['inReplyTo']
@object = fetch @object['inReplyTo']
create if @object
end
end
end
def delete
Dir["inbox/*/*.json"].each do |file|
FileUtils.rm file if JSON.parse(File.read(file))['id'] == @object['id']
end
end
def update
delete
create
end
def announce
create
end
def accept
if @object['type'] == 'Follow'
File.open(File.join(FOLLOWING, mention(@object['object'])+'.json'),'w+'){|f| f.puts @object.to_json}
end
end
def undo
if @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
end
def follow
File.open(File.join(FOLLOWERS, mention(@activity['actor']) + '.json'), 'w+') { |f| f.puts @body }
accept = { '@context' => 'https://www.w3.org/ns/activitystreams',
'id' => File.join(SOCIAL_URL + '#accepts', SecureRandom.uuid),
'type' => 'Accept',
'actor' => ACTOR,
'object' => @activity,
'to' => [ @activity['actor'] ]
}
send_signed accept#, @activity['actor']
end
#when "Move"
#when "Add"
#when "Remove"
#when "Like"
#when "Block"
def inbox
Dir[File.join(INBOX,'*','*.json')].collect do |file|
JSON.parse(File.read(file))
end.sort_by { |o| o["published"] }
end
def object_exists?
not 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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