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|
# TODO check POST to outbox with mastinator.com
require 'json'
require 'net/http'
require 'uri'
require 'base64'
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 = URI.join(SOCIAL_URL, USER)
MATRIX = "@#{USER}:matrix.#{WWW_DOMAIN}"
class Application
def call(env)
code = 404
type = "application/activity+json"
case env['REQUEST_METHOD']
when 'POST'
case env["REQUEST_URI"]
when "/inbox" # receive from server
if verify(env)
save JSON.parse(env["rack.input"].gets), "inbox"
code = 200
response = "OK"
else
code = 401
response = "not verified"
end
when "/outbox" # receive from client
# TODO auth
if auth(env)
input = JSON.parse(env["rack.input"].gets)
input["type"] ? activity = input : activity = activity(input) # expand object to create activity
save activity, "outbox"
deliver ["to", "bto", "cc", "bcc", "audience"].collect { |d| activity[d] }.flatten.uniq
case activity["type"]
when "Create"
when "Update"
when "Delete"
when "Follow"
when "Remove"
when "Like"
when "Block"
when "Undo"
end
code = 200
response = "OK"
else
code = 403
response = "forbidden"
end
end
when 'GET'
case env["REQUEST_URI"]
when "/.well-known/webfinger?resource=acct:#{ACCOUNT}"
type = "application/jrd+json"
response = File.read("webfinger")
code = 200
when "/#{USER}"
response = File.read(USER)
code = 200
when %r{/[inbox|outbox|following|followers|likes|shares]}
response = ordered_collection env["REQUEST_URI"]
code = 200
end
end
[code, { "Content-Type" => type }, [response]]
end
def activity object
date = Time.now.strftime("%Y-%m-%dT%H:%M:%S.%3N")
object["id"] = "TODO"
object["attributedTo"] = ACTOR
object["published"] = date
{
"@context" => "https://www.w3.org/ns/activitystreams",
"type" => "Create",
"id" => "https://example.net/~mallory/87374",
"actor" => ACTOR,
"object" => object,
"published" => date,
"to" => object["to"],
"cc" => object["cc"]
}
end
def save activity, dir
date = Time.now.strftime("%Y-%m-%dT%H:%M:%S.%3N")
File.open(File.join(dir, date), "w+") { |f| f.puts activity.to_json }
end
def deliver addr
p addr
keypair = OpenSSL::PKey::RSA.new(File.read('private.pem'))
addr.each do |url|
date = Time.now.utc.httpdate
uri = URI.parse(url)
signed_string = "(request-target): post /inbox\nhost: #{uri.host}\ndate: #{date}"
signed_string = keypair.sign(OpenSSL::Digest::SHA256.new, signed_string)
signature = Base64.urlsafe_encode64(signed_string).encode("UTF-8")
signed_header = 'keyId="#{url}",headers="(request-target) host date",signature="' + signature + '"'
inbox_url = JSON.parse(Net::HTTP.get(uri,
{ 'Accept' => 'application/ld+json; profile="https://www.w3.org/ns/activitystreams"' }))["inbox"]
inbox = URI.parse(inbox_url)
http = Net::HTTP.new(inbox.host, inbox.port)
http.use_ssl = true
# http.verify_mode = OpenSSL::SSL::VERIFY_NONE
header = {
'Accept' => 'application/ld+json; profile="https://www.w3.org/ns/activitystreams"',
'Host' => inbox.host,
'Date' => date,
'Signature' => signed_header,
}
request = Net::HTTP::Post.new(inbox.request_uri, header)
request.body = document.to_json
response = http.request(request)
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
begin
signature_header = env["HTTP_SIGNATURE"].split(',').each do |pair|
pair.gsub('"', '').split('=')
end.to_h
key_id = signature_header['keyId']
headers = signature_header['headers']
signature = Base64.urlsafe_decode64(signature_header['signature'].encode("ascii-8bit"))
uri = URI(key_id)
res = Net::HTTP.get_response(uri)
actor = JSON.parse(res.body)
key = OpenSSL::PKey::RSA.new(actor['publicKey']['publicKeyPem'])
comparison = headers.split(' ').map do |signed_header_name|
if signed_header_name == '(request-target)'
'(request-target): post /inbox'
else
"#{signed_header_name}: #{env["HTTP_" + signed_header_name.upcase]}"
end
end.join("\n").encode("ascii-8bit")
key.verify(OpenSSL::Digest::SHA256.new, signature, comparison)
rescue
false
end
end
def auth
true
end
end
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