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# server-server
post "/inbox" do
verify!
request.body.rewind # in case someone already read it
body = request.body.read
action = JSON.parse body
case action["type"]
when "Create"
create action["object"]
when "Delete"
delete action["object"]
when "Update"
delete action["object"]
create action["object"]
when "Follow"
File.open(File.join("public", "followers", mention(action["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" => action }
send_signed accept, action["actor"]
when "Undo"
o = action["object"]
case o["type"]
when "Follow"
Dir["public/followers/*.json"].each do |follower|
FileUtils.rm follower if JSON.parse(File.read(follower))["actor"] == o["actor"]
end
end
when "Accept"
o = action["object"]
case o["type"]
when "Follow"
File.open(File.join("public","following",mention(o['object'])+".json"),"w+"){|f| f.puts o.to_json}
end
when "Announce"
download action["object"]
#when "Move"
#when "Add"
#when "Remove"
#when "Like"
#when "Block"
else
p "Unknown action: #{action['type']}"
p body
end
end
# public
get "/.well-known/webfinger" do
request["resource"] == "acct:#{ACCOUNT}" ? send_file("./public/webfinger", :type => "application/jrd+json") : halt(404)
end
get "/pdp8", :provides => 'html' do
redirect 'https://pdp8.info'
end
get "/pdp8" do
send_file "pdp8.json", :type => 'application/ld+json; profile="https://www.w3.org/ns/activitystreams"'
end
["/outbox","/following","/followers"].each do |path|
get path do
ordered_collection(path).to_json
end
end
helpers do
# https://github.com/mastodon/mastodon/blob/main/app/controllers/concerns/signature_verification.rb
def verify!
# verify digest
request.body.rewind # in case someone already read it
body = request.body.read
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
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 object
unless object['type'] == 'Person'
doc = File.join("inbox", "#{Time.now.strftime('%Y-%m-%dT%H:%M:%S.%N')}.json")
File.open(doc, "w+") { |f| f.puts object.to_json }
if object['inReplyTo']
@dir = 'inbox'
items
if @items.select{|it| it[:id] == object['inReplyTo'] }.empty?
download object['inReplyTo']
end
end
end
end
def download object_url
create fetch(object_url)
end
def delete object
Dir["inbox/*.json"].each do |doc|
FileUtils.rm doc if JSON.parse(File.read(doc))["id"] == object["id"]
end
end
def ordered_collection dir
posts = Dir[File.join("public",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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