Use a custom pool-aware FollowRedirects middleware

This commit is contained in:
rinpatch 2020-05-16 11:49:19 +03:00
parent 281ddd5e37
commit 94c8f3cfaf
6 changed files with 109 additions and 24 deletions

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@ -24,7 +24,6 @@ defmodule Pleroma.HTTP.AdapterHelper do
| {Connection.proxy_type(), Connection.host(), pos_integer()}
@callback options(keyword(), URI.t()) :: keyword()
@callback after_request(keyword()) :: :ok
@callback get_conn(URI.t(), keyword()) :: {:ok, term()} | {:error, term()}
@spec format_proxy(String.t() | tuple() | nil) :: proxy() | nil
@ -67,9 +66,6 @@ defmodule Pleroma.HTTP.AdapterHelper do
Keyword.merge(opts, timeout: timeout)
end
@spec after_request(keyword()) :: :ok
def after_request(opts), do: adapter_helper().after_request(opts)
def get_conn(uri, opts), do: adapter_helper().get_conn(uri, opts)
defp adapter, do: Application.get_env(:tesla, :adapter)

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@ -9,9 +9,6 @@ defmodule Pleroma.HTTP.AdapterHelper.Default do
AdapterHelper.maybe_add_proxy(opts, AdapterHelper.format_proxy(proxy))
end
@spec after_request(keyword()) :: :ok
def after_request(_opts), do: :ok
@spec get_conn(URI.t(), keyword()) :: {:ok, keyword()}
def get_conn(_uri, opts), do: {:ok, opts}
end

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@ -34,15 +34,6 @@ defmodule Pleroma.HTTP.AdapterHelper.Gun do
|> Keyword.merge(incoming_opts)
end
@spec after_request(keyword()) :: :ok
def after_request(opts) do
if opts[:conn] && opts[:body_as] != :chunks do
ConnectionPool.release_conn(opts[:conn])
end
:ok
end
defp add_scheme_opts(opts, %{scheme: "http"}), do: opts
defp add_scheme_opts(opts, %{scheme: "https"}) do

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@ -24,8 +24,6 @@ defmodule Pleroma.HTTP.AdapterHelper.Hackney do
defp add_scheme_opts(opts, _), do: opts
def after_request(_), do: :ok
@spec get_conn(URI.t(), keyword()) :: {:ok, keyword()}
def get_conn(_uri, opts), do: {:ok, opts}
end

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@ -69,14 +69,11 @@ defmodule Pleroma.HTTP do
request = build_request(method, headers, options, url, body, params)
adapter = Application.get_env(:tesla, :adapter)
client = Tesla.client([Tesla.Middleware.FollowRedirects], adapter)
client = Tesla.client([Pleroma.HTTP.Middleware.FollowRedirects], adapter)
response = request(client, request)
AdapterHelper.after_request(adapter_opts)
response
request(client, request)
# Connection release is handled in a custom FollowRedirects middleware
err ->
err
end

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@ -0,0 +1,106 @@
# Pleroma: A lightweight social networking server
# Copyright © 2015-2020 Tymon Tobolski <https://github.com/teamon/tesla/blob/master/lib/tesla/middleware/follow_redirects.ex>
# Copyright © 2020 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only
defmodule Pleroma.HTTP.Middleware.FollowRedirects do
@moduledoc """
Pool-aware version of https://github.com/teamon/tesla/blob/master/lib/tesla/middleware/follow_redirects.ex
Follow 3xx redirects
## Options
- `:max_redirects` - limit number of redirects (default: `5`)
"""
alias Pleroma.Gun.ConnectionPool
@behaviour Tesla.Middleware
@max_redirects 5
@redirect_statuses [301, 302, 303, 307, 308]
@impl Tesla.Middleware
def call(env, next, opts \\ []) do
max = Keyword.get(opts, :max_redirects, @max_redirects)
redirect(env, next, max)
end
defp redirect(env, next, left) do
opts = env.opts[:adapter]
case Tesla.run(env, next) do
{:ok, %{status: status} = res} when status in @redirect_statuses and left > 0 ->
release_conn(opts)
case Tesla.get_header(res, "location") do
nil ->
{:ok, res}
location ->
location = parse_location(location, res)
case get_conn(location, opts) do
{:ok, opts} ->
%{env | opts: Keyword.put(env.opts, :adapter, opts)}
|> new_request(res.status, location)
|> redirect(next, left - 1)
e ->
e
end
end
{:ok, %{status: status}} when status in @redirect_statuses ->
release_conn(opts)
{:error, {__MODULE__, :too_many_redirects}}
other ->
unless opts[:body_as] == :chunks do
release_conn(opts)
end
other
end
end
defp get_conn(location, opts) do
uri = URI.parse(location)
case ConnectionPool.get_conn(uri, opts) do
{:ok, conn} ->
{:ok, Keyword.merge(opts, conn: conn)}
e ->
e
end
end
defp release_conn(opts) do
ConnectionPool.release_conn(opts[:conn])
end
# The 303 (See Other) redirect was added in HTTP/1.1 to indicate that the originally
# requested resource is not available, however a related resource (or another redirect)
# available via GET is available at the specified location.
# https://tools.ietf.org/html/rfc7231#section-6.4.4
defp new_request(env, 303, location), do: %{env | url: location, method: :get, query: []}
# The 307 (Temporary Redirect) status code indicates that the target
# resource resides temporarily under a different URI and the user agent
# MUST NOT change the request method (...)
# https://tools.ietf.org/html/rfc7231#section-6.4.7
defp new_request(env, 307, location), do: %{env | url: location}
defp new_request(env, _, location), do: %{env | url: location, query: []}
defp parse_location("https://" <> _rest = location, _env), do: location
defp parse_location("http://" <> _rest = location, _env), do: location
defp parse_location(location, env) do
env.url
|> URI.parse()
|> URI.merge(location)
|> URI.to_string()
end
end