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helpers do
def protected!
redirect("/login.html") unless session['client']
end
def verify!
# https://github.com/mastodon/mastodon/blob/main/app/controllers/concerns/signature_verification.rb
# TODO verify digest
begin
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
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 400 unless key.verify(OpenSSL::Digest.new('SHA256'), signature, comparison)
rescue => e
p request.env["HTTP_SIGNATURE"], e
halt 400
end
end
def items
nr = 0
@items = Dir[File.join(@dir, '*.json')].sort.collect do |file|
item = JSON.parse(File.read(file))
mention = mention(item['attributedTo'])
following_path = File.join('public', 'following', mention + '.json')
File.exists?(following_path) ? follow = 'unfollow' : follow = 'follow'
nr += 1
{ :id => item['id'],
:nr => nr,
:parent => item['inReplyTo'],
:file => file,
:actor_url => item['attributedTo'],
:mention => mention,
:follow => follow,
:content => item['content'],
:attachment => item['attachment'],
:indent => 2,
:replies => []
}
end.compact
@items.last[:nr] = @items.last[:nr] - 2 unless @items.empty?
end
def threads
items
@threads = []
@items.each do |i|
if i[:parent].nil? or @items.select{|it| it[:id] == i[:parent] }.empty?
@threads << i
else
@items.select{|it| it[:id] == i[:parent] }.each do |it|
i[:indent] = it[:indent] + 2
it[:replies] << i
end
end
end
end
def html item
@item = item
erb :item
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 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 people
File.read('cache/people.tsv').split("\n").collect {|l| l.chomp.split("\t")}
end
def mention actor
person = people.select{|p| p[1] == actor}
if person.empty?
mention = "#{fetch(actor)["preferredUsername"]}@#{URI(actor).host}"
File.open('cache/people.tsv','a'){|f| f.puts "#{mention}\t#{actor}"}
mention
else
person[0][0]
end
end
def actor mention
mention = mention.sub(/^@/, '').chomp
actors = people.select{|p| p[0] == mention}
if actors.empty?
user, server = mention.split("@")
actor = fetch("https://#{server}/.well-known/webfinger?resource=acct:#{mention}",
"application/jrd+json")["links"].select { |l|
l["rel"] == "self"
}[0]["href"]
File.open('cache/people.tsv','a'){|f| f.puts "#{mention}\t#{actor}"}
actor
else
actors[0][0]
end
end
def fetch url, accept = 'application/ld+json; profile="https://www.w3.org/ns/activitystreams"'
p url
response = `/run/current-system/sw/bin/curl --fail-with-body -sSL -H 'Accept: #{accept}' #{url}`
halt 400 unless $?.success?
JSON.parse(response)
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
def send_signed object, url
# https://github.com/mastodon/mastodon/blob/main/app/lib/request.rb
keypair = OpenSSL::PKey::RSA.new(File.read('private.pem'))
date = Time.now.utc.httpdate
host = URI.parse(url).host
inbox = fetch(url)["inbox"]
sha256 = OpenSSL::Digest::SHA256.new
body = object.to_json
digest = "SHA-256=" + sha256.base64digest(body)
signed_string = "(request-target): post #{inbox}\nhost: #{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 + '"'
puts `/run/current-system/sw/bin/curl -i -X POST -H 'Content-Type: application/activity+json' -H 'Host: #{host}' -H 'Date: #{date}' -H 'Digest: #{digest}' -H 'Signature: #{signed_header}' -d '#{body}' #{inbox}`
end
end
|
