Pleroma/lib/pleroma/web/web_finger/web_finger.ex

198 lines
5.1 KiB
Elixir
Raw Normal View History

# Pleroma: A lightweight social networking server
2020-03-03 23:44:49 +01:00
# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only
2017-04-17 13:44:41 +02:00
defmodule Pleroma.Web.WebFinger do
2019-05-25 06:24:21 +02:00
alias Pleroma.HTTP
2019-02-09 16:16:26 +01:00
alias Pleroma.User
alias Pleroma.Web
alias Pleroma.Web.Federator.Publisher
alias Pleroma.Web.XML
alias Pleroma.XmlBuilder
2018-03-27 16:45:38 +02:00
require Jason
2017-04-28 17:41:12 +02:00
require Logger
2017-04-17 13:44:41 +02:00
def host_meta do
2018-03-30 15:01:53 +02:00
base_url = Web.base_url()
2017-04-17 13:44:41 +02:00
{
2018-03-30 15:01:53 +02:00
:XRD,
%{xmlns: "http://docs.oasis-open.org/ns/xri/xrd-1.0"},
2017-04-17 13:44:41 +02:00
{
2018-03-30 15:01:53 +02:00
:Link,
%{
rel: "lrdd",
type: "application/xrd+xml",
template: "#{base_url}/.well-known/webfinger?resource={uri}"
}
2017-04-17 13:44:41 +02:00
}
}
2018-03-30 15:01:53 +02:00
|> XmlBuilder.to_doc()
2017-04-17 13:44:41 +02:00
end
def webfinger(resource, fmt) when fmt in ["XML", "JSON"] do
2018-03-30 15:01:53 +02:00
host = Pleroma.Web.Endpoint.host()
regex = ~r/(acct:)?(?<username>[a-z0-9A-Z_\.-]+)@#{host}/
2018-03-30 15:01:53 +02:00
with %{"username" => username} <- Regex.named_captures(regex, resource),
2019-04-22 09:20:43 +02:00
%User{} = user <- User.get_cached_by_nickname(username) do
{:ok, represent_user(user, fmt)}
2018-03-30 15:01:53 +02:00
else
_e ->
with %User{} = user <- User.get_cached_by_ap_id(resource) do
{:ok, represent_user(user, fmt)}
2018-03-30 15:01:53 +02:00
else
_e ->
{:error, "Couldn't find user"}
end
2018-03-21 18:58:31 +01:00
end
end
defp gather_links(%User{} = user) do
[
%{
"rel" => "http://webfinger.net/rel/profile-page",
"type" => "text/html",
"href" => user.ap_id
}
] ++ Publisher.gather_webfinger_links(user)
end
2018-03-21 18:58:31 +01:00
def represent_user(user, "JSON") do
{:ok, user} = User.ensure_keys_present(user)
2018-03-30 15:01:53 +02:00
2018-03-21 18:58:31 +01:00
%{
2018-03-30 15:01:53 +02:00
"subject" => "acct:#{user.nickname}@#{Pleroma.Web.Endpoint.host()}",
2018-03-21 18:58:31 +01:00
"aliases" => [user.ap_id],
"links" => gather_links(user)
2018-03-21 18:58:31 +01:00
}
end
def represent_user(user, "XML") do
{:ok, user} = User.ensure_keys_present(user)
links =
gather_links(user)
|> Enum.map(fn link -> {:Link, link} end)
2018-03-30 15:01:53 +02:00
2017-04-17 13:44:41 +02:00
{
2018-03-30 15:01:53 +02:00
:XRD,
%{xmlns: "http://docs.oasis-open.org/ns/xri/xrd-1.0"},
2017-04-17 13:44:41 +02:00
[
2018-03-30 15:01:53 +02:00
{:Subject, "acct:#{user.nickname}@#{Pleroma.Web.Endpoint.host()}"},
{:Alias, user.ap_id}
] ++ links
2017-04-17 13:44:41 +02:00
}
2018-03-30 15:01:53 +02:00
|> XmlBuilder.to_doc()
2017-04-17 13:44:41 +02:00
end
2017-04-28 17:41:12 +02:00
2018-06-07 06:26:44 +02:00
defp webfinger_from_xml(doc) do
subject = XML.string_from_xpath("//Subject", doc)
2018-03-30 15:01:53 +02:00
subscribe_address =
~s{//Link[@rel="http://ostatus.org/schema/1.0/subscribe"]/@template}
|> XML.string_from_xpath(doc)
ap_id =
~s{//Link[@rel="self" and @type="application/activity+json"]/@href}
|> XML.string_from_xpath(doc)
data = %{
"subject" => subject,
"subscribe_address" => subscribe_address,
"ap_id" => ap_id
}
{:ok, data}
2017-04-28 17:41:12 +02:00
end
defp webfinger_from_json(doc) do
2018-03-30 15:01:53 +02:00
data =
Enum.reduce(doc["links"], %{"subject" => doc["subject"]}, fn link, data ->
case {link["type"], link["rel"]} do
{"application/activity+json", "self"} ->
Map.put(data, "ap_id", link["href"])
{"application/ld+json; profile=\"https://www.w3.org/ns/activitystreams\"", "self"} ->
Map.put(data, "ap_id", link["href"])
2018-03-30 15:01:53 +02:00
_ ->
Logger.debug("Unhandled type: #{inspect(link["type"])}")
data
end
end)
{:ok, data}
end
2017-08-24 12:54:53 +02:00
def get_template_from_xml(body) do
xpath = "//Link[@rel='lrdd']/@template"
2018-03-30 15:01:53 +02:00
2017-08-24 12:54:53 +02:00
with doc when doc != :error <- XML.parse_document(body),
2018-03-30 15:01:53 +02:00
template when template != nil <- XML.string_from_xpath(xpath, doc) do
2017-08-24 12:54:53 +02:00
{:ok, template}
end
end
def find_lrdd_template(domain) do
2018-12-02 15:08:36 +01:00
with {:ok, %{status: status, body: body}} when status in 200..299 <-
2019-05-25 06:24:21 +02:00
HTTP.get("http://#{domain}/.well-known/host-meta", []) do
2017-08-24 12:54:53 +02:00
get_template_from_xml(body)
else
2017-11-19 02:22:07 +01:00
_ ->
with {:ok, %{body: body, status: status}} when status in 200..299 <-
HTTP.get("https://#{domain}/.well-known/host-meta", []) do
2017-09-13 11:59:56 +02:00
get_template_from_xml(body)
else
e -> {:error, "Can't find LRDD template: #{inspect(e)}"}
2017-09-13 11:59:56 +02:00
end
2017-08-24 12:54:53 +02:00
end
end
2019-07-24 17:13:10 +02:00
@spec finger(String.t()) :: {:ok, map()} | {:error, any()}
2017-08-24 12:54:53 +02:00
def finger(account) do
2018-02-23 16:55:12 +01:00
account = String.trim_leading(account, "@")
2018-03-30 15:01:53 +02:00
domain =
with [_name, domain] <- String.split(account, "@") do
domain
else
_e ->
URI.parse(account).host
end
2017-04-29 19:06:01 +02:00
encoded_account = URI.encode("acct:#{account}")
2018-05-06 08:58:59 +02:00
address =
case find_lrdd_template(domain) do
{:ok, template} ->
String.replace(template, "{uri}", encoded_account)
2018-03-30 15:01:53 +02:00
2018-05-06 08:58:59 +02:00
_ ->
"https://#{domain}/.well-known/webfinger?resource=#{encoded_account}"
2018-05-06 08:58:59 +02:00
end
2018-03-30 15:01:53 +02:00
with response <-
2019-05-25 06:24:21 +02:00
HTTP.get(
2018-03-30 15:01:53 +02:00
address,
2020-02-11 08:12:57 +01:00
[{"accept", "application/xrd+xml,application/jrd+json"}]
2018-03-30 15:01:53 +02:00
),
2018-12-02 15:08:36 +01:00
{:ok, %{status: status, body: body}} when status in 200..299 <- response do
2018-03-30 15:01:53 +02:00
doc = XML.parse_document(body)
if doc != :error do
webfinger_from_xml(doc)
else
2018-06-07 06:26:44 +02:00
with {:ok, doc} <- Jason.decode(body) do
webfinger_from_json(doc)
end
2018-03-30 15:01:53 +02:00
end
2017-04-28 17:41:12 +02:00
else
e ->
Logger.debug(fn -> "Couldn't finger #{account}" end)
2017-05-05 12:07:38 +02:00
Logger.debug(fn -> inspect(e) end)
2017-04-28 17:41:12 +02:00
{:error, e}
end
end
2017-04-17 13:44:41 +02:00
end