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require 'json'
require 'net/http'
require 'uri'
require 'base64'
require 'securerandom'
require 'fileutils'
require 'digest/sha2'
USER = "pdp8"
WWW_DOMAIN = "pdp8.info"
WWW_URL = "https://#{WWW_DOMAIN}"
SOCIAL_DOMAIN = "social.#{WWW_DOMAIN}"
ACCOUNT = "#{USER}@#{SOCIAL_DOMAIN}"
SOCIAL_URL = "https://#{SOCIAL_DOMAIN}"
ACTOR = File.join(SOCIAL_URL, USER)
MATRIX = "@#{USER}:matrix.#{WWW_DOMAIN}"
class Application
def call(env)
code = 404
type = 'application/ld+json; profile="https://www.w3.org/ns/activitystreams"'
response = "not allowed"
case env['REQUEST_METHOD']
when 'POST'
input = env["rack.input"].read
case env["REQUEST_PATH"]
when "/inbox" # receive from server
if verify(env)
begin
object = JSON.parse(input)
case object["type"]
when "Create"
File.open(File.join("inbox", SecureRandom.uuid + ".json"), "w+") { |f| f.puts input }
when "Delete"
puts input
when "Follow"
File.open(File.join("followers", SecureRandom.uuid + ".json"), "w+") { |f| f.puts input }
when "Undo"
puts input
else
puts input
end
code = 200
response = "OK"
rescue => e
puts input, e.to_s
response = "Request body contains invalid json."
end
else
code = 401
response = "Verification failed for POST to #{env["REQUEST_URI"]}."
end
when "/outbox" # receive from client
# TODO auth
if auth(env)
input = JSON.parse(input)
input["type"] == "Create" ? activity = input : activity = activity(input) # expand object to create activity
add_id activity
save activity
FileUtils.ln_s File.join('..', path(activity)), "outbox"
code, response = send activity, ["to", "bto", "cc", "bcc", "audience"].collect { |d|
activity[d]
}.flatten.uniq.compact
code = 200
response = "OK"
else
code = 403
response = "forbidden"
end
end
when 'GET'
case env["REQUEST_PATH"]
when "/.well-known/webfinger?resource=acct:#{ACCOUNT}"
type = "application/jrd+json"
response = File.read("webfinger")
code = 200
when "/#{USER}"
# TODO serve html
response = File.read(USER)
code = 200
when %r{/[inbox|outbox|following|followers|likes|shares]}
response = ordered_collection env["REQUEST_PATH"]
code = 200
end
end
[code, { "Content-Type" => type }, [response]]
end
def add_id object
object["id"] = File.join(SOCIAL_URL, object["type"].downcase, SecureRandom.uuid + ".json")
end
def activity object
date = Time.now.strftime("%Y-%m-%dT%H:%M:%S")
object["attributedTo"] = ACTOR
object["published"] = date
add_id object
save object
{
"@context" => "https://www.w3.org/ns/activitystreams",
"type" => "Create",
"actor" => ACTOR,
"object" => object,
"published" => date,
"to" => object["to"],
"cc" => object["cc"]
}
end
def path object
object["id"].sub(SOCIAL_URL, '').sub('/', '')
end
def save object
path = path object
FileUtils.mkdir_p File.dirname(path)
File.open(path, "w+") { |f| f.puts object.to_json }
end
def send object, urls
# https://github.com/mastodon/mastodon/blob/main/app/lib/request.rb
keypair = OpenSSL::PKey::RSA.new(File.read('private.pem'))
urls.each do |url|
date = Time.now.utc.httpdate
uri = URI.parse(url)
sha256 = OpenSSL::Digest::SHA256.new
body = object.to_json
digest = "SHA-256=" + sha256.base64digest(body)
signed_string = "(request-target): post #{inbox uri}\nhost: #{uri.host}\ndate: #{date}\ndigest: #{digest}\ncontent-type: application/activity+json"
signature = Base64.strict_encode64(keypair.sign(OpenSSL::Digest.new('SHA256'), signed_string))
signed_header = 'keyId="' + ACTOR + '#main-key",algorithm="rsa-sha256",headers="(request-target) host date digest content-type",signature="' + signature + '"'
uri = URI.parse(get(url)["inbox"])
http = Net::HTTP.new(uri.host, uri.port)
http.use_ssl = true
header = {
'Content-Type' => 'application/activity+json',
'Host' => uri.host,
'Date' => date,
'Digest' => digest,
'Signature' => signed_header,
}
request = Net::HTTP::Post.new(uri.request_uri, header)
request.body = body
response = http.request(request)
# TODO return error if response.code > 400
puts(response.body, response.code)
end
end
def ordered_collection dir
collection = dir.sub(/^\//, "")
posts = Dir[File.join(collection, "*.json")].sort.reverse.collect { |f| p f; JSON.parse(File.read f) }
{
"@context" => "https://www.w3.org/ns/activitystreams",
"summary" => "#{USER} #{collection}",
"type" => "OrderedCollection",
"totalItems" => posts.size,
"orderedItems" => posts,
}.to_json
end
def verify env
# https://github.com/mastodon/mastodon/blob/main/app/controllers/concerns/signature_verification.rb
# TODO verify digest
signature_params = {}
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 = get key_id
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}: #{env["CONTENT_TYPE"]}"
else
"#{signed_params_name}: #{env["HTTP_" + signed_params_name.upcase]}"
end
end.join("\n")
key.verify(OpenSSL::Digest.new('SHA256'), signature, comparison)
end
def get url
uri = URI(url)
http = Net::HTTP.new(uri.host, uri.port)
http.use_ssl = true
header = { 'Accept' => 'application/ld+json; profile="https://www.w3.org/ns/activitystreams"' }
request = Net::HTTP::Get.new(uri.request_uri, header)
response = http.request(request)
JSON.parse(response.body)
end
def inbox uri
URI(get(uri)["inbox"]).request_uri
end
def auth env
true
end
end
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