From 79baf2fd996c8b69333cf991f4ccf93f0965a744 Mon Sep 17 00:00:00 2001
From: Eugen Rochko <eugen@zeonfederated.com>
Date: Wed, 24 Feb 2016 00:57:47 +0100
Subject: [PATCH] Process favourites, reblogs and replies from Salmon

---
 app/helpers/application_helper.rb           |  5 ++
 app/models/account.rb                       |  2 +-
 app/services/process_feed_service.rb        |  1 +
 app/services/process_interaction_service.rb | 55 +++++++++++++--------
 4 files changed, 42 insertions(+), 21 deletions(-)

diff --git a/app/helpers/application_helper.rb b/app/helpers/application_helper.rb
index ed7b59165..36e31929e 100644
--- a/app/helpers/application_helper.rb
+++ b/app/helpers/application_helper.rb
@@ -5,6 +5,11 @@ module ApplicationHelper
     "tag:#{LOCAL_DOMAIN},#{date.strftime('%Y-%m-%d')}:objectId=#{id}:objectType=#{type}"
   end
 
+  def unique_tag_to_local_id(tag, expected_type)
+    Regexp.new("objectId=([\d]+):objectType=#{expected_type}").match(tag)
+    return match[1] unless match.nil?
+  end
+
   def subscription_url(account)
     add_base_url_prefix subscriptions_path(id: account.id, format: '')
   end
diff --git a/app/models/account.rb b/app/models/account.rb
index fc399d69c..66345b5ab 100644
--- a/app/models/account.rb
+++ b/app/models/account.rb
@@ -15,7 +15,7 @@ class Account < ActiveRecord::Base
   has_many :followers, through: :passive_relationships, source: :account
 
   def follow!(other_account)
-    self.active_relationships.create!(target_account: other_account)
+    self.active_relationships.first_or_create!(target_account: other_account)
   end
 
   def unfollow!(other_account)
diff --git a/app/services/process_feed_service.rb b/app/services/process_feed_service.rb
index f77415a30..1367d1634 100644
--- a/app/services/process_feed_service.rb
+++ b/app/services/process_feed_service.rb
@@ -18,6 +18,7 @@ class ProcessFeedService
 
       # todo: not everything is a status. there are follows, favourites
       # todo: RTs
+      # account.statuses.create!(reblog: status, uri: activity_uri(xml), url: activity_url(xml), text: content(xml))
     end
   end
 end
diff --git a/app/services/process_interaction_service.rb b/app/services/process_interaction_service.rb
index b91cfcf66..c466ae652 100644
--- a/app/services/process_interaction_service.rb
+++ b/app/services/process_interaction_service.rb
@@ -5,7 +5,7 @@ class ProcessInteractionService
     body = salmon.unpack(envelope)
     xml  = Nokogiri::XML(body)
 
-    return unless involves_target_account?(xml, target_account) && contains_author?(xml)
+    return unless contains_author?(xml)
 
     username = xml.at_xpath('/xmlns:entry/xmlns:author/xmlns:name').content
     url      = xml.at_xpath('/xmlns:entry/xmlns:author/xmlns:uri').content
@@ -18,17 +18,17 @@ class ProcessInteractionService
     end
 
     if salmon.verify(envelope, account.keypair)
-      case get_verb(xml)
+      case verb(xml)
       when :follow
-        account.follow!(target_account)
+        follow!(account, target_account)
       when :unfollow
-        account.unfollow!(target_account)
+        unfollow!(account, target_account)
       when :favorite
-        # todo: a favourite
+        favourite!(xml, account)
       when :post
-        # todo: a reply
+        add_post!(body, account) if mentions_account?(xml, target_account)
       when :share
-        # todo: a reblog
+        add_post!(body, account) unless status.nil?
       end
     end
   end
@@ -39,26 +39,37 @@ class ProcessInteractionService
     !(xml.at_xpath('/xmlns:entry/xmlns:author/xmlns:name').nil? || xml.at_xpath('/xmlns:entry/xmlns:author/xmlns:uri').nil?)
   end
 
-  def involves_target_account?(xml, account)
-    targeted_at_account?(xml, account) || mentions_account?(xml, account)
+  def mentions_account?(xml, account)
+    xml.xpath('/xmlns:entry/xmlns:link[@rel="mentioned"]').each { |mention_link| return true if mention_link.attribute('ref') == profile_url(name: account.username) }
+    false
   end
 
-  def targeted_at_account?(xml, account)
-    target_id = xml.at_xpath('/xmlns:entry/activity:object/xmlns:id')
-    !target_id.nil? && target_id.content == profile_url(name: account.username)
+  def verb(xml)
+    xml.at_xpath('//activity:verb').content.gsub('http://activitystrea.ms/schema/1.0/', '').to_sym
   end
 
-  def mentions_account?(xml, account)
-    xml.xpath('/xmlns:entry/xmlns:link[@rel="mentioned"]').each do |mention_link|
-      return true if mention_link.attribute('ref') == profile_url(name: account.username)
-    end
+  def follow!(account, target_account)
+    account.follow!(target_account)
+  end
 
-    false
+  def unfollow!(account, target_account)
+    account.unfollow!(target_account)
+  end
+
+  def favourite!(xml, from_account)
+    status.favourites.first_or_create!(account: from_account)
+  end
+
+  def add_post!(body, account)
+    process_feed_service.(body, account)
   end
 
-  def get_verb(xml)
-    verb = xml.at_xpath('//activity:verb').content.gsub 'http://activitystrea.ms/schema/1.0/', ''
-    verb.to_sym
+  def status(xml)
+    Status.find(unique_tag_to_local_id(activity_id, 'Status'))
+  end
+
+  def activity_id(xml)
+    xml.at_xpath('/xmlns:entry/xmlns:id').content
   end
 
   def salmon
@@ -68,4 +79,8 @@ class ProcessInteractionService
   def follow_remote_account_service
     FollowRemoteAccountService.new
   end
+
+  def process_feed_service
+    ProcessFeedService.new
+  end
 end