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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.HTTP do
+ @moduledoc """
+ Wrapper for `Tesla.request/2`.
+ """
+
+ alias Pleroma.HTTP.AdapterHelper
+ alias Pleroma.HTTP.Request
+ alias Pleroma.HTTP.RequestBuilder, as: Builder
+ alias Tesla.Client
+ alias Tesla.Env
+
+ require Logger
+
+ @type t :: __MODULE__
+ @type method() :: :get | :post | :put | :delete | :head
+
+ @doc """
+ Performs GET request.
+
+ See `Pleroma.HTTP.request/5`
+ """
+ @spec get(Request.url() | nil, Request.headers(), keyword()) ::
+ nil | {:ok, Env.t()} | {:error, any()}
+ def get(url, headers \\ [], options \\ [])
+ def get(nil, _, _), do: nil
+ def get(url, headers, options), do: request(:get, url, "", headers, options)
+
+ @spec head(Request.url(), Request.headers(), keyword()) :: {:ok, Env.t()} | {:error, any()}
+ def head(url, headers \\ [], options \\ []), do: request(:head, url, "", headers, options)
+
+ @doc """
+ Performs POST request.
+
+ See `Pleroma.HTTP.request/5`
+ """
+ @spec post(Request.url(), String.t(), Request.headers(), keyword()) ::
+ {:ok, Env.t()} | {:error, any()}
+ def post(url, body, headers \\ [], options \\ []),
+ do: request(:post, url, body, headers, options)
+
+ @doc """
+ Builds and performs http request.
+
+ # Arguments:
+ `method` - :get, :post, :put, :delete, :head
+ `url` - full url
+ `body` - request body
+ `headers` - a keyworld list of headers, e.g. `[{"content-type", "text/plain"}]`
+ `options` - custom, per-request middleware or adapter options
+
+ # Returns:
+ `{:ok, %Tesla.Env{}}` or `{:error, error}`
+
+ """
+ @spec request(method(), Request.url(), String.t(), Request.headers(), keyword()) ::
+ {:ok, Env.t()} | {:error, any()}
+ def request(method, url, body, headers, options) when is_binary(url) do
+ uri = URI.parse(url)
+ adapter_opts = AdapterHelper.options(uri, options || [])
+
+ options = put_in(options[:adapter], adapter_opts)
+ params = options[:params] || []
+ request = build_request(method, headers, options, url, body, params)
+
+ adapter = Application.get_env(:tesla, :adapter)
+
+ client = Tesla.client(adapter_middlewares(adapter), adapter)
+
+ maybe_limit(
+ fn ->
+ request(client, request)
+ end,
+ adapter,
+ adapter_opts
+ )
+ end
+
+ @spec request(Client.t(), keyword()) :: {:ok, Env.t()} | {:error, any()}
+ def request(client, request), do: Tesla.request(client, request)
+
+ defp build_request(method, headers, options, url, body, params) do
+ Builder.new()
+ |> Builder.method(method)
+ |> Builder.headers(headers)
+ |> Builder.opts(options)
+ |> Builder.url(url)
+ |> Builder.add_param(:body, :body, body)
+ |> Builder.add_param(:query, :query, params)
+ |> Builder.convert_to_keyword()
+ end
+
+ @prefix Pleroma.Gun.ConnectionPool
+ defp maybe_limit(fun, Tesla.Adapter.Gun, opts) do
+ ConcurrentLimiter.limit(:"#{@prefix}.#{opts[:pool] || :default}", fun)
+ end
+
+ defp maybe_limit(fun, _, _) do
+ fun.()
+ end
+
+ defp adapter_middlewares(Tesla.Adapter.Gun) do
+ [Tesla.Middleware.FollowRedirects, Pleroma.Tesla.Middleware.ConnectionPool]
+ end
+
+ defp adapter_middlewares(_), do: []
+end