34 lines
1010 B
Markdown
34 lines
1010 B
Markdown
# How to set rich media cache TTL based on image TTL
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## Explanation
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Richmedia are cached without the TTL, but the rich media may have image which can expire, like AWS-signed URL.
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In such cases, the old image URL (expired) is returned from the media cache.
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So, to avoid such situation, we can define a module that will set TTL based on image.
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The module must adopt behaviour `Pleroma.Web.RichMedia.Parser.TTL`
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### Example
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```exs
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defmodule MyModule do
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@behaviour Pleroma.Web.RichMedia.Parser.TTL
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@impl Pleroma.Web.RichMedia.Parser.TTL
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def ttl(data, url) do
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image_url = Map.get(data, :image)
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# do some parsing in the url and get the TTL of the image
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# return TTL is unix time
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parse_ttl_from_url(image_url)
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end
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end
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```
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And update the config
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```exs
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config :pleroma, :rich_media,
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ttl_setters: [Pleroma.Web.RichMedia.Parser.TTL.AwsSignedUrl, MyModule]
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```
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> 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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