Improve error handling, add configuration

This commit is contained in:
href 2017-11-28 21:44:25 +01:00
parent e28c110eba
commit 1cb5cbdc6c
No known key found for this signature in database
GPG key ID: EE8296C1A152C325
3 changed files with 45 additions and 32 deletions

View file

@ -47,6 +47,11 @@
limit: 5000,
registrations_open: true
config :pleroma, :media_proxy,
enabled: false,
redirect_on_failure: true
#base_url: "https://cache.pleroma.social"
# Import environment specific config. This must remain at the bottom
# of this file so it overrides the configuration defined above.
import_config "#{Mix.env}.exs"

View file

@ -2,19 +2,27 @@ defmodule Pleroma.Web.MediaProxy.MediaProxyController do
use Pleroma.Web, :controller
require Logger
@cache_control %{
default: "public, max-age=1209600",
error: "public, must-revalidate, max-age=160",
}
def remote(conn, %{"sig" => sig, "url" => url}) do
{:ok, url} = Pleroma.Web.MediaProxy.decode_url(sig, url)
url = url |> URI.encode()
case proxy_request(url) do
{:ok, content_type, body} ->
conn
|> put_resp_content_type(content_type)
|> set_cache_header(:default)
|> send_resp(200, body)
other ->
conn
|> set_cache_header(:error)
|> redirect(external: url)
config = Application.get_env(:pleroma, :media_proxy, [])
with \
true <- Keyword.get(config, :enabled, false),
{:ok, url} <- Pleroma.Web.MediaProxy.decode_url(sig, url),
url = URI.encode(url),
{:ok, content_type, body} <- proxy_request(url)
do
conn
|> put_resp_content_type(content_type)
|> set_cache_header(:default)
|> send_resp(200, body)
else
false -> send_error(conn, 404)
{:error, :invalid_signature} -> send_error(conn, 403)
{:error, {:http, _, url}} -> redirect_or_error(conn, url, Keyword.get(config, :redirect_on_failure, true))
end
end
@ -28,21 +36,24 @@ defp proxy_request(link) do
{:ok, headers["Content-Type"], body}
{:ok, status, _, _} ->
Logger.warn "MediaProxy: request failed, status #{status}, link: #{link}"
{:error, :bad_status}
{:error, {:http, :bad_status, link}}
{:error, error} ->
Logger.warn "MediaProxy: request failed, error #{inspect error}, link: #{link}"
{:error, error}
{:error, {:http, error, link}}
end
end
@cache_control %{
default: "public, max-age=1209600",
error: "public, must-revalidate, max-age=160",
}
defp set_cache_header(conn, key) do
Plug.Conn.put_resp_header(conn, "cache-control", @cache_control[key])
end
defp set_cache_header(conn, true), do: set_cache_header(conn, :default)
defp set_cache_header(conn, false), do: set_cache_header(conn, :error)
defp set_cache_header(conn, key) when is_atom(key), do: set_cache_header(conn, @cache_control[key])
defp set_cache_header(conn, value) when is_binary(value), do: Plug.Conn.put_resp_header(conn, "cache-control", value)
defp redirect_or_error(conn, url, true), do: redirect(conn, external: url)
defp redirect_or_error(conn, url, _), do: send_error(conn, 502, "Media proxy error: " <> url)
defp send_error(conn, code, body \\ "") do
conn
|> set_cache_header(:error)
|> send_resp(code, body)
end
end

View file

@ -1,23 +1,25 @@
defmodule Pleroma.Web.MediaProxy do
@base64_opts [padding: false]
@base64_key Application.get_env(:pleroma, Pleroma.Web.Endpoint)[:secret_key_base]
def url(nil), do: nil
def url(url) do
if String.starts_with?(url, Pleroma.Web.base_url) do
config = Application.get_env(:pleroma, :media_proxy, [])
if !Keyword.get(config, :enabled, false) or String.starts_with?(url, Pleroma.Web.base_url) do
url
else
secret = Application.get_env(:pleroma, Pleroma.Web.Endpoint)[:secret_key_base]
base64 = Base.url_encode64(url, @base64_opts)
sig = :crypto.hmac(:sha, @base64_key, base64)
sig = :crypto.hmac(:sha, secret, base64)
sig64 = sig |> Base.url_encode64(@base64_opts)
cache_url("#{sig64}/#{base64}")
Keyword.get(config, :base_url, Pleroma.Web.base_url) <> "/proxy/#{sig64}/#{base64}"
end
end
def decode_url(sig, url) do
secret = Application.get_env(:pleroma, Pleroma.Web.Endpoint)[:secret_key_base]
sig = Base.url_decode64!(sig, @base64_opts)
local_sig = :crypto.hmac(:sha, @base64_key, url)
local_sig = :crypto.hmac(:sha, secret, url)
if local_sig == sig do
{:ok, Base.url_decode64!(url, @base64_opts)}
else
@ -25,9 +27,4 @@ def decode_url(sig, url) do
end
end
defp cache_url(path) do
"/proxy/" <> path
end
end