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# Pleroma: A lightweight social networking server
# Copyright © 2017-2022 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only
defmodule Pleroma.Web.WebFinger do
alias Pleroma.HTTP
alias Pleroma.User
alias Pleroma.Web.Endpoint
alias Pleroma.Web.Federator.Publisher
alias Pleroma.Web.XML
alias Pleroma.XmlBuilder
require Jason
require Logger
def host_meta do
base_url = Endpoint.url()
{
:XRD,
%{xmlns: "http://docs.oasis-open.org/ns/xri/xrd-1.0"},
{
:Link,
%{
rel: "lrdd",
type: "application/xrd+xml",
template: "#{base_url}/.well-known/webfinger?resource={uri}"
}
}
}
|> XmlBuilder.to_doc()
end
def webfinger(resource, fmt) when fmt in ["XML", "JSON"] do
host = Pleroma.Web.Endpoint.host()
regex = ~r/(acct:)?(?<username>[a-z0-9A-Z_\.-]+)@#{host}/
with %{"username" => username} <- Regex.named_captures(regex, resource),
%User{} = user <- User.get_cached_by_nickname(username) do
{:ok, represent_user(user, fmt)}
else
_e ->
with %User{} = user <- User.get_cached_by_ap_id(resource) do
{:ok, represent_user(user, fmt)}
else
_e ->
{:error, "Couldn't find user"}
end
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
defp gather_aliases(%User{} = user) do
[user.ap_id | user.also_known_as]
end
def represent_user(user, "JSON") do
{:ok, user} = User.ensure_keys_present(user)
%{
"subject" => "acct:#{user.nickname}@#{Pleroma.Web.Endpoint.host()}",
"aliases" => gather_aliases(user),
"links" => gather_links(user)
}
end
def represent_user(user, "XML") do
{:ok, user} = User.ensure_keys_present(user)
aliases =
user
|> gather_aliases()
|> Enum.map(&{:Alias, &1})
links =
gather_links(user)
|> Enum.map(fn link -> {:Link, link} end)
{
:XRD,
%{xmlns: "http://docs.oasis-open.org/ns/xri/xrd-1.0"},
[
{:Subject, "acct:#{user.nickname}@#{Pleroma.Web.Endpoint.host()}"}
] ++ aliases ++ links
}
|> XmlBuilder.to_doc()
end
defp webfinger_from_xml(body) do
with {:ok, doc} <- XML.parse_document(body) do
subject = XML.string_from_xpath("//Subject", doc)
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}
end
end
defp webfinger_from_json(body) do
with {:ok, doc} <- Jason.decode(body) do
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"])
{nil, "http://ostatus.org/schema/1.0/subscribe"} ->
Map.put(data, "subscribe_address", link["template"])
_ ->
Logger.debug("Unhandled type: #{inspect(link["type"])}")
data
end
end)
{:ok, data}
end
end
def get_template_from_xml(body) do
xpath = "//Link[@rel='lrdd']/@template"
with {:ok, doc} <- XML.parse_document(body),
template when template != nil <- XML.string_from_xpath(xpath, doc) do
{:ok, template}
end
end
def find_lrdd_template(domain) do
with {:ok, %{status: status, body: body}} when status in 200..299 <-
HTTP.get("http://#{domain}/.well-known/host-meta") do
get_template_from_xml(body)
else
_ ->
with {:ok, %{body: body, status: status}} when status in 200..299 <-
HTTP.get("https://#{domain}/.well-known/host-meta") do
get_template_from_xml(body)
else
e -> {:error, "Can't find LRDD template: #{inspect(e)}"}
end
end
end
defp get_address_from_domain(domain, encoded_account) when is_binary(domain) do
case find_lrdd_template(domain) do
{:ok, template} ->
String.replace(template, "{uri}", encoded_account)
_ ->
"https://#{domain}/.well-known/webfinger?resource=#{encoded_account}"
end
end
defp get_address_from_domain(_, _), do: nil
@spec finger(String.t()) :: {:ok, map()} | {:error, any()}
def finger(account) do
account = String.trim_leading(account, "@")
domain =
with [_name, domain] <- String.split(account, "@") do
domain
else
_e ->
URI.parse(account).host
end
encoded_account = URI.encode("acct:#{account}")
with address when is_binary(address) <- get_address_from_domain(domain, encoded_account),
response <-
HTTP.get(
address,
[{"accept", "application/xrd+xml,application/jrd+json"}]
),
{:ok, %{status: status, body: body, headers: headers}} when status in 200..299 <-
response do
case List.keyfind(headers, "content-type", 0) do
{_, content_type} ->
case Plug.Conn.Utils.media_type(content_type) do
{:ok, "application", subtype, _} when subtype in ~w(xrd+xml xml) ->
webfinger_from_xml(body)
{:ok, "application", subtype, _} when subtype in ~w(jrd+json json) ->
webfinger_from_json(body)
_ ->
{:error, {:content_type, content_type}}
end
_ ->
{:error, {:content_type, nil}}
end
else
e ->
Logger.debug(fn -> "Couldn't finger #{account}" end)
Logger.debug(fn -> inspect(e) end)
{:error, e}
end
end
end

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