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