# Pleroma: A lightweight social networking server
-# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
+# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only
defmodule Pleroma.Web.RichMedia.Parser do
Cachex.fetch!(:rich_media_cache, url, fn _ ->
{:commit, parse_url(url)}
end)
+ |> set_ttl_based_on_image(url)
rescue
e ->
{:error, "Cachex error: #{inspect(e)}"}
end
end
+ @doc """
+ Set the rich media cache based on the expiration time of image.
+
+ Adopt behaviour `Pleroma.Web.RichMedia.Parser.TTL`
+
+ ## Example
+
+ defmodule MyModule do
+ @behaviour 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
+ # and return ttl is unix time
+ parse_ttl_from_url(image_url)
+ end
+ end
+
+ Define the module in the config
+
+ config :pleroma, :rich_media,
+ ttl_setters: [MyModule]
+ """
+ def set_ttl_based_on_image({:ok, data}, url) do
+ with {:ok, nil} <- Cachex.ttl(:rich_media_cache, url),
+ ttl when is_number(ttl) <- get_ttl_from_image(data, url) do
+ Cachex.expire_at(:rich_media_cache, url, ttl * 1000)
+ {:ok, data}
+ else
+ _ ->
+ {:ok, data}
+ end
+ end
+
+ defp get_ttl_from_image(data, url) do
+ Pleroma.Config.get([:rich_media, :ttl_setters])
+ |> Enum.reduce({:ok, nil}, fn
+ module, {:ok, _ttl} ->
+ module.ttl(data, url)
+
+ _, error ->
+ error
+ end)
+ end
+
defp parse_url(url) do
try do
{:ok, %Tesla.Env{body: html}} = Pleroma.HTTP.get(url, [], adapter: @hackney_options)
html
+ |> parse_html()
|> maybe_parse()
+ |> Map.put(:url, url)
|> clean_parsed_data()
|> check_parsed_data()
rescue
e ->
- {:error, "Parsing error: #{inspect(e)}"}
+ {:error, "Parsing error: #{inspect(e)} #{inspect(__STACKTRACE__)}"}
end
end
+ defp parse_html(html), do: Floki.parse_document!(html)
+
defp maybe_parse(html) do
Enum.reduce_while(parsers(), %{}, fn parser, acc ->
case parser.parse(html, acc) do
end)
end
- defp check_parsed_data(%{title: title} = data) when is_binary(title) and byte_size(title) > 0 do
+ defp check_parsed_data(%{title: title} = data)
+ when is_binary(title) and byte_size(title) > 0 do
{:ok, data}
end