127 lines
3.2 KiB
Elixir
127 lines
3.2 KiB
Elixir
# Pleroma: A lightweight social networking server
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# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
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# SPDX-License-Identifier: AGPL-3.0-only
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defmodule Pleroma.Web.MediaProxy do
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alias Pleroma.Config
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alias Pleroma.Upload
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alias Pleroma.Web
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alias Pleroma.Web.MediaProxy.Invalidation
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@base64_opts [padding: false]
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@cache_table :banned_urls_cache
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def cache_table, do: @cache_table
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@spec in_banned_urls(String.t()) :: boolean()
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def in_banned_urls(url), do: elem(Cachex.exists?(@cache_table, url(url)), 1)
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def remove_from_banned_urls(urls) when is_list(urls) do
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Cachex.execute!(@cache_table, fn cache ->
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Enum.each(Invalidation.prepare_urls(urls), &Cachex.del(cache, &1))
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end)
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end
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def remove_from_banned_urls(url) when is_binary(url) do
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Cachex.del(@cache_table, url(url))
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end
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def put_in_banned_urls(urls) when is_list(urls) do
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Cachex.execute!(@cache_table, fn cache ->
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Enum.each(Invalidation.prepare_urls(urls), &Cachex.put(cache, &1, true))
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end)
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end
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def put_in_banned_urls(url) when is_binary(url) do
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Cachex.put(@cache_table, url(url), true)
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end
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def url(url) when is_nil(url) or url == "", do: nil
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def url("/" <> _ = url), do: url
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def url(url) do
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if disabled?() or not url_proxiable?(url) do
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url
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else
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encode_url(url)
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end
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end
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@spec url_proxiable?(String.t()) :: boolean()
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def url_proxiable?(url) do
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if local?(url) or whitelisted?(url) do
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false
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else
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true
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end
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end
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defp disabled?, do: !Config.get([:media_proxy, :enabled], false)
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defp local?(url), do: String.starts_with?(url, Pleroma.Web.base_url())
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defp whitelisted?(url) do
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%{host: domain} = URI.parse(url)
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mediaproxy_whitelist_domains =
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[:media_proxy, :whitelist]
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|> Config.get()
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|> Enum.map(&maybe_get_domain_from_url/1)
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whitelist_domains =
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if base_url = Config.get([Upload, :base_url]) do
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%{host: base_domain} = URI.parse(base_url)
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[base_domain | mediaproxy_whitelist_domains]
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else
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mediaproxy_whitelist_domains
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end
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domain in whitelist_domains
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end
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defp maybe_get_domain_from_url("http" <> _ = url) do
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URI.parse(url).host
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end
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defp maybe_get_domain_from_url(domain), do: domain
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def encode_url(url) do
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base64 = Base.url_encode64(url, @base64_opts)
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sig64 =
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base64
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|> signed_url
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|> Base.url_encode64(@base64_opts)
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build_url(sig64, base64, filename(url))
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end
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def decode_url(sig, url) do
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with {:ok, sig} <- Base.url_decode64(sig, @base64_opts),
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signature when signature == sig <- signed_url(url) do
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{:ok, Base.url_decode64!(url, @base64_opts)}
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else
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_ -> {:error, :invalid_signature}
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end
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end
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defp signed_url(url) do
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:crypto.hmac(:sha, Config.get([Web.Endpoint, :secret_key_base]), url)
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end
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def filename(url_or_path) do
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if path = URI.parse(url_or_path).path, do: Path.basename(path)
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end
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def build_url(sig_base64, url_base64, filename \\ nil) do
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[
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Config.get([:media_proxy, :base_url], Web.base_url()),
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"proxy",
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sig_base64,
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url_base64,
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filename
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]
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|> Enum.filter(& &1)
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|> Path.join()
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end
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end
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