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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.
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