Tokens: Server side generated tokens.

#18

src/invidious/helpers/redis_tokens.cr

@@ -22,4 +22,28 @@ module Tokens
   def get_visitor_data
     return @@visitor_data
   end
+
+  def generate_tokens(user : String)
+    po_token = ""
+    visitor_data = ""
+    attempts = 0
+
+    LOGGER.debug("Generating po_token and visitor_data for user: '#{user}'")
+    REDIS_DB.publish("generate-token", "#{user}")
+
+    while REDIS_DB.get("invidious:#{user}:po_token").nil? && REDIS_DB.get("invidious:#{user}:visitor_data").nil?
+      if attempts > 50
+        break
+      end
+      LOGGER.debug("Waiting for tokens to arrive at redis for user: '#{user}'")
+      attempts += 1
+      sleep 250.milliseconds
+    end
+
+    po_token = REDIS_DB.get("invidious:#{user}:po_token")
+    visitor_data = REDIS_DB.get("invidious:#{user}:visitor_data")
+
+    LOGGER.debug("Tokens successfully generated for user: '#{user}'")
+    return {po_token, visitor_data}
+  end
 end