defmodule Pleroma.Web.RichMedia.Parser do
require Logger
- @cachex Pleroma.Config.get([:cachex, :provider], Cachex)
+ @config_impl Application.compile_env(:pleroma, [__MODULE__, :config_impl], Pleroma.Config)
defp parsers do
Pleroma.Config.get([:rich_media, :parsers])
end
- def parse(nil), do: {:error, "No URL provided"}
-
- if Pleroma.Config.get(:env) == :test do
- @spec parse(String.t()) :: {:ok, map()} | {:error, any()}
- def parse(url), do: parse_url(url)
- else
- @spec parse(String.t()) :: {:ok, map()} | {:error, any()}
- def parse(url) do
- with {:ok, data} <- get_cached_or_parse(url),
- {:ok, _} <- set_ttl_based_on_image(data, url) do
- {:ok, data}
- end
- end
-
- defp get_cached_or_parse(url) do
- case @cachex.fetch(:rich_media_cache, url, fn ->
- case parse_url(url) do
- {:ok, _} = res ->
- {:commit, res}
-
- {:error, reason} = e ->
- # Unfortunately we have to log errors here, instead of doing that
- # along with ttl setting at the bottom. Otherwise we can get log spam
- # if more than one process was waiting for the rich media card
- # while it was generated. Ideally we would set ttl here as well,
- # so we don't override it number_of_waiters_on_generation
- # times, but one, obviously, can't set ttl for not-yet-created entry
- # and Cachex doesn't support returning ttl from the fetch callback.
- log_error(url, reason)
- {:commit, e}
- end
- end) do
- {action, res} when action in [:commit, :ok] ->
- case res do
- {:ok, _data} = res ->
- res
-
- {:error, reason} = e ->
- if action == :commit, do: set_error_ttl(url, reason)
- e
- end
-
- {:error, e} ->
- {:error, {:cachex_error, e}}
- end
- end
-
- defp set_error_ttl(_url, :body_too_large), do: :ok
- defp set_error_ttl(_url, {:content_type, _}), do: :ok
-
- # The TTL is not set for the errors above, since they are unlikely to change
- # with time
-
- defp set_error_ttl(url, _reason) do
- ttl = Pleroma.Config.get([:rich_media, :failure_backoff], 60_000)
- @cachex.expire(:rich_media_cache, url, ttl)
- :ok
- end
-
- defp log_error(url, {:invalid_metadata, data}) do
- Logger.debug(fn -> "Incomplete or invalid metadata for #{url}: #{inspect(data)}" end)
- end
-
- defp log_error(url, reason) do
- Logger.warn(fn -> "Rich media error for #{url}: #{inspect(reason)}" end)
- 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
+ def parse(nil), do: nil
- Define the module in the config
-
- config :pleroma, :rich_media,
- ttl_setters: [MyModule]
- """
- @spec set_ttl_based_on_image(map(), String.t()) ::
- {:ok, Integer.t() | :noop} | {:error, :no_key}
- def set_ttl_based_on_image(data, url) do
- case get_ttl_from_image(data, url) do
- {:ok, ttl} when is_number(ttl) ->
- ttl = ttl * 1000
-
- case @cachex.expire_at(:rich_media_cache, url, ttl) do
- {:ok, true} -> {:ok, ttl}
- {:ok, false} -> {:error, :no_key}
- end
-
- _ ->
- {:ok, :noop}
+ @spec parse(String.t()) :: {:ok, map()} | {:error, any()}
+ def parse(url) do
+ with :ok <- validate_page_url(url),
+ {:ok, data} <- parse_url(url) do
+ data = Map.put(data, "url", url)
+ {:ok, data}
end
end
- defp get_ttl_from_image(data, url) do
- [:rich_media, :ttl_setters]
- |> Pleroma.Config.get()
- |> Enum.reduce({:ok, nil}, fn
- module, {:ok, _ttl} ->
- module.ttl(data, url)
-
- _, error ->
- error
- end)
- end
-
- def parse_url(url) do
+ defp parse_url(url) do
with {:ok, %Tesla.Env{body: html}} <- Pleroma.Web.RichMedia.Helpers.rich_media_get(url),
{:ok, html} <- Floki.parse_document(html) do
html
|> maybe_parse()
- |> Map.put("url", url)
|> clean_parsed_data()
|> check_parsed_data()
end
end)
|> Map.new()
end
+
+ @spec validate_page_url(URI.t() | binary()) :: :ok | :error
+ defp validate_page_url(page_url) when is_binary(page_url) do
+ validate_tld = @config_impl.get([Pleroma.Formatter, :validate_tld])
+
+ page_url
+ |> Linkify.Parser.url?(validate_tld: validate_tld)
+ |> parse_uri(page_url)
+ end
+
+ defp validate_page_url(%URI{host: host, scheme: "https"}) do
+ cond do
+ Linkify.Parser.ip?(host) ->
+ :error
+
+ host in @config_impl.get([:rich_media, :ignore_hosts], []) ->
+ :error
+
+ get_tld(host) in @config_impl.get([:rich_media, :ignore_tld], []) ->
+ :error
+
+ true ->
+ :ok
+ end
+ end
+
+ defp validate_page_url(_), do: :error
+
+ defp parse_uri(true, url) do
+ url
+ |> URI.parse()
+ |> validate_page_url
+ end
+
+ defp parse_uri(_, _), do: :error
+
+ defp get_tld(host) do
+ host
+ |> String.split(".")
+ |> Enum.reverse()
+ |> hd
+ end
end
projects / anni / blobdiff