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-# How to set rich media cache ttl based on image ttl
-## Explanation
-
-Richmedia are cached without the ttl but the rich media may have image which can expire, like aws signed url.
-In such cases the old image url (expired) is returned from the media cache.
-
-So to avoid such situation we can define a module that will set ttl based on image.
-The module must adopt behaviour `Pleroma.Web.RichMedia.Parser.TTL`
-
-### Example
-
-```exs
-defmodule MyModule do
-  @behaviour Pleroma.Web.RichMedia.Parser.TTL
-
-  @impl Pleroma.Web.RichMedia.Parser.TTL
-  def ttl(data, url) do
-    image_url = Map.get(data, :image)
-    # do some parsing in the url and get the ttl of the image
-    # return ttl is unix time
-    parse_ttl_from_url(image_url)
-  end
-end
-```
-
-And update the config
-
-```exs
-config :pleroma, :rich_media,
-  ttl_setters: [Pleroma.Web.RichMedia.Parser.TTL.AwsSignedUrl, MyModule]
-```
-
-> For reference there is a parser for AWS signed URL `Pleroma.Web.RichMedia.Parser.TTL.AwsSignedUrl`, it's enabled by default.