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helpers do
def curl ext, url
#p "/run/current-system/sw/bin/curl -fsSL #{ext} #{url}"
response = `/run/current-system/sw/bin/curl -fsSL #{ext} #{url}`
$?.success? ? response : nil
end
def fetch url, accept = 'application/ld+json; profile="https://www.w3.org/ns/activitystreams"'
response = curl("-H 'Accept: #{accept}'", url)
response ? JSON.parse(response) : nil
end
# https://github.com/mastodon/mastodon/blob/main/app/lib/request.rb
def send_signed object, url
keypair = OpenSSL::PKey::RSA.new(File.read('private.pem'))
date = Time.now.utc.httpdate
body = object.to_json
sha256 = OpenSSL::Digest::SHA256.new
digest = "SHA-256=" + sha256.base64digest(body)
host = URI.parse(url).host
inbox = fetch(url)["inbox"]
return false unless inbox
request_uri = URI(inbox).request_uri
signed_string = "(request-target): post #{request_uri}\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 + '"'
p curl("-X POST -H 'Content-Type: application/activity+json' -H 'Host: #{host}' -H 'Date: #{date}' -H 'Digest: #{digest}' -H 'Signature: #{signed_header}' -d '#{body}'", inbox)
$?.success?
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?
a = fetch(actor)
return nil unless a
mention = "#{a["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("@")
a = fetch("https://#{server}/.well-known/webfinger?resource=acct:#{mention}", "application/jrd+json")
return nil unless a
actor = a["links"].select { |l|
l["rel"] == "self"
}[0]["href"]
File.open('cache/people.tsv','a'){|f| f.puts "#{mention}\t#{actor}"}
actor
else
actors[0][1]
end
end
end
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