Add users table

src/helpers.cr

@@ -79,6 +79,15 @@ class ChannelVideo
   })
 end
 
+class User
+  add_mapping({
+    id:            String,
+    updated:       Time,
+    notifications: Int32,
+    subscriptions: Array(String),
+  })
+end
+
 class RedditSubmit
   JSON.mapping({
     data: RedditSubmitData,
@@ -545,3 +554,40 @@ def fetch_channel(id, client, db)
 
   return channel
 end
+
+def get_user(sid, client, headers, db)
+  if db.query_one?("SELECT EXISTS (SELECT true FROM users WHERE id = $1)", sid, as: Bool)
+    user = db.query_one("SELECT * FROM users WHERE id = $1", sid, as: User)
+
+    if Time.now - user.updated > 1.minutes
+      user = fetch_user(sid, client, headers)
+      user_array = user.to_a
+      args = arg_array(user_array)
+      
+      db.exec("INSERT INTO users VALUES (#{args}) \
+      ON CONFLICT (id) DO UPDATE SET updated = $2, subscriptions = $4", user_array)
+    end
+  else
+    user = fetch_user(sid, client, headers)
+    args = arg_array(user.to_a)
+    db.exec("INSERT INTO users VALUES (#{args})", user.to_a)
+  end
+
+  return user
+end
+
+def fetch_user(sid, client, headers)
+  feed = client.get("/subscription_manager?action_takeout=1", headers).body
+
+  channels = [] of String
+  feed = XML.parse_html(feed)
+  feed.xpath_nodes("//opml/outline/outline").each do |channel|
+    id = channel["xmlurl"][-24..-1]
+    get_channel(id, client, PG_DB)
+
+    channels << id
+  end
+
+  user = User.new(sid, Time.now, 0, channels)
+  return user
+end