From 711bf7f86daddd0209244f9640d8a3f27d958e3a Mon Sep 17 00:00:00 2001
From: pdp8 <pdp8@pdp8.info>
Date: Fri, 21 Jul 2023 00:52:49 +0200
Subject: inbox and outbox unified

---
 server.rb | 86 ++++++++++++++++++++++++++++++++++++++++++---------------------
 1 file changed, 57 insertions(+), 29 deletions(-)

(limited to 'server.rb')

diff --git a/server.rb b/server.rb
index 49204a3..f7e9b82 100644
--- a/server.rb
+++ b/server.rb
@@ -11,14 +11,11 @@ post '/inbox' do
     p @body
     halt 400
   end
+  halt 501 if @activity['actor'] and @activity['type'] == 'Delete' # deleted actors return 403 => verification error
+  verify! # unless type == :accept # pixelfed sends unsigned accept activities???
+  complete_and_save(@activity)
   type = @activity['type'].downcase.to_sym
-  p type
-  halt 501 unless respond_to?(type)
-  @object = @activity['object']
-  @object = fetch(@object) if @object.is_a?(String) && @object.match(/^http/)
-  halt 400 unless @object
-  verify! unless type == :accept # pixelfed sends unsigned accept activities???
-  send(type)
+  send(type) if %i[follow accept undo].include? type
   halt 200
 end
 
@@ -28,43 +25,30 @@ get '/.well-known/webfinger' do
   send_file(WEBFINGER, type: 'application/jrd+json')
 end
 
-['/pdp8', '/following', '/followers', '/outbox', '/shared'].each do |path|
+get '/pdp8' do
+  send_file(File.join(PUBLIC_DIR, 'pdp8.json'), type: CONTENT_TYPE)
+end
+
+['/following', '/followers'].each do |path|
   get path do
     send_file(File.join(PUBLIC_DIR, path) + '.json', type: CONTENT_TYPE)
   end
 end
 
 helpers do
-  def create
-    return unless @object
-
-    # return if File.readlines(VISITED).collect { |l| l.chomp }.include? @object['id']
-
-    # File.open(VISITED, 'a+') { |f| f.puts @object['id'] }
-    update_collection INBOX, @object
-    return unless @object['inReplyTo']
-
-    @object = fetch @object['inReplyTo']
-    create if @object
-  end
-
-  def announce
-    create
-  end
-
   def follow
     update_collection FOLLOWERS, @activity['actor']
     outbox 'Accept', @activity, [@activity['actor']]
   end
 
   def accept
-    halt 501 unless @object['type'] == 'Follow'
-    update_collection FOLLOWING, @object['object']
+    halt 501 unless @activity['object']['type'] == 'Follow'
+    update_collection FOLLOWING, @activity['object']['object']
   end
 
   def undo
-    halt 501 unless @object['type'] == 'Follow'
-    update_collection FOLLOWERS, @object['actor'], true
+    halt 501 unless @activity['object']['type'] == 'Follow'
+    update_collection FOLLOWERS, @activity['object']['actor'], true
   end
 
   # https://github.com/mastodon/mastodon/blob/main/app/controllers/concerns/signature_verification.rb
@@ -102,4 +86,48 @@ helpers do
 
     halt 403 unless key.verify(OpenSSL::Digest.new('SHA256'), signature, comparison)
   end
+
+  def outbox(type, object, recipients)
+    # add date and id, save
+    activity = complete_and_save({
+                                   '@context' => 'https://www.w3.org/ns/activitystreams',
+                                   'type' => type,
+                                   'actor' => ACTOR,
+                                   'object' => object,
+                                   'to' => recipients
+                                 })
+
+    # send
+    # https://github.com/mastodon/mastodon/blob/main/app/lib/request.rb
+    keypair = OpenSSL::PKey::RSA.new(File.read('private.pem'))
+    body = activity.to_json
+    sha256 = OpenSSL::Digest.new('SHA256')
+    digest = "SHA-256=#{sha256.base64digest(body)}"
+
+    inboxes = []
+    recipients.uniq.each do |url|
+      next if [ACTOR, 'https://www.w3.org/ns/activitystreams#Public'].include? url
+
+      actor = fetch url
+      next unless actor
+
+      if actor['endpoints'] and actor['endpoints']['sharedInbox']
+        inboxes << actor['endpoints']['sharedInbox']
+      elsif actor['inbox']
+        inboxes << actor['inbox']
+      end
+    end
+
+    inboxes.compact.uniq.each do |inbox|
+      uri = URI(inbox)
+      string = "(request-target): post #{uri.request_uri}\nhost: #{uri.host}\ndate: #{httpdate}\ndigest: #{digest}\ncontent-type: application/activity+json"
+      signature = Base64.strict_encode64(keypair.sign(OpenSSL::Digest.new('SHA256'), string))
+      signed_header = "keyId=\"#{ACTOR}#main-key\",algorithm=\"rsa-sha256\",headers=\"(request-target) host date digest content-type\",signature=\"#{signature}\""
+
+      curl(
+        "-X POST -H 'Content-Type: application/activity+json' -H 'Host: #{uri.host}' -H 'Date: #{httpdate}' -H 'Digest: #{digest}' -H 'Signature: #{signed_header}' -d '#{body}'", inbox
+      )
+    end
+    activity
+  end
 end
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