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diff --git a/lib/pleroma/web/web_finger/web_finger.ex b/lib/pleroma/web/web_finger/web_finger.ex
index 71ccf251a..c4051e63e 100644
--- a/lib/pleroma/web/web_finger/web_finger.ex
+++ b/lib/pleroma/web/web_finger/web_finger.ex
@@ -1,197 +1,201 @@
# Pleroma: A lightweight social networking server
# Copyright © 2017-2020 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
alias Pleroma.Web.Federator.Publisher
alias Pleroma.Web.XML
alias Pleroma.XmlBuilder
require Jason
require Logger
def host_meta do
base_url = Web.base_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
def represent_user(user, "JSON") do
{:ok, user} = User.ensure_keys_present(user)
%{
"subject" => "acct:#{user.nickname}@#{Pleroma.Web.Endpoint.host()}",
"aliases" => [user.ap_id],
"links" => gather_links(user)
}
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)
{
:XRD,
%{xmlns: "http://docs.oasis-open.org/ns/xri/xrd-1.0"},
[
{:Subject, "acct:#{user.nickname}@#{Pleroma.Web.Endpoint.host()}"},
{:Alias, user.ap_id}
] ++ links
}
|> XmlBuilder.to_doc()
end
defp webfinger_from_xml(doc) 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
defp webfinger_from_json(doc) 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"])
_ ->
Logger.debug("Unhandled type: #{inspect(link["type"])}")
data
end
end)
{:ok, data}
end
def get_template_from_xml(body) do
xpath = "//Link[@rel='lrdd']/@template"
with doc when doc != :error <- 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}")
- address =
- case find_lrdd_template(domain) do
- {:ok, template} ->
- String.replace(template, "{uri}", encoded_account)
-
- _ ->
- "https://#{domain}/.well-known/webfinger?resource=#{encoded_account}"
- end
-
- with response <-
+ 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}} when status in 200..299 <- response do
doc = XML.parse_document(body)
if doc != :error do
webfinger_from_xml(doc)
else
with {:ok, doc} <- Jason.decode(body) do
webfinger_from_json(doc)
end
end
else
e ->
Logger.debug(fn -> "Couldn't finger #{account}" end)
Logger.debug(fn -> inspect(e) end)
{:error, e}
end
end
end
diff --git a/test/web/web_finger/web_finger_test.exs b/test/web/web_finger/web_finger_test.exs
index f4884e0a2..96fc0bbaa 100644
--- a/test/web/web_finger/web_finger_test.exs
+++ b/test/web/web_finger/web_finger_test.exs
@@ -1,111 +1,116 @@
# Pleroma: A lightweight social networking server
# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only
defmodule Pleroma.Web.WebFingerTest do
use Pleroma.DataCase
alias Pleroma.Web.WebFinger
import Pleroma.Factory
import Tesla.Mock
setup do
mock(fn env -> apply(HttpRequestMock, :request, [env]) end)
:ok
end
describe "host meta" do
test "returns a link to the xml lrdd" do
host_info = WebFinger.host_meta()
assert String.contains?(host_info, Pleroma.Web.base_url())
end
end
describe "incoming webfinger request" do
test "works for fqns" do
user = insert(:user)
{:ok, result} =
WebFinger.webfinger("#{user.nickname}@#{Pleroma.Web.Endpoint.host()}", "XML")
assert is_binary(result)
end
test "works for ap_ids" do
user = insert(:user)
{:ok, result} = WebFinger.webfinger(user.ap_id, "XML")
assert is_binary(result)
end
end
describe "fingering" do
+ test "returns error for nonsensical input" do
+ assert {:error, _} = WebFinger.finger("bliblablu")
+ assert {:error, _} = WebFinger.finger("pleroma.social")
+ end
+
test "returns error when fails parse xml or json" do
user = "invalid_content@social.heldscal.la"
assert {:error, %Jason.DecodeError{}} = WebFinger.finger(user)
end
test "returns the ActivityPub actor URI for an ActivityPub user" do
user = "framasoft@framatube.org"
{:ok, _data} = WebFinger.finger(user)
end
test "returns the ActivityPub actor URI for an ActivityPub user with the ld+json mimetype" do
user = "kaniini@gerzilla.de"
{:ok, data} = WebFinger.finger(user)
assert data["ap_id"] == "https://gerzilla.de/channel/kaniini"
end
test "it work for AP-only user" do
user = "kpherox@mstdn.jp"
{:ok, data} = WebFinger.finger(user)
assert data["magic_key"] == nil
assert data["salmon"] == nil
assert data["topic"] == nil
assert data["subject"] == "acct:kPherox@mstdn.jp"
assert data["ap_id"] == "https://mstdn.jp/users/kPherox"
assert data["subscribe_address"] == "https://mstdn.jp/authorize_interaction?acct={uri}"
end
test "it works for friendica" do
user = "lain@squeet.me"
{:ok, _data} = WebFinger.finger(user)
end
test "it gets the xrd endpoint" do
{:ok, template} = WebFinger.find_lrdd_template("social.heldscal.la")
assert template == "https://social.heldscal.la/.well-known/webfinger?resource={uri}"
end
test "it gets the xrd endpoint for hubzilla" do
{:ok, template} = WebFinger.find_lrdd_template("macgirvin.com")
assert template == "https://macgirvin.com/xrd/?uri={uri}"
end
test "it gets the xrd endpoint for statusnet" do
{:ok, template} = WebFinger.find_lrdd_template("status.alpicola.com")
assert template == "http://status.alpicola.com/main/xrd?uri={uri}"
end
test "it works with idna domains as nickname" do
nickname = "lain@" <> to_string(:idna.encode("zetsubou.みんな"))
{:ok, _data} = WebFinger.finger(nickname)
end
test "it works with idna domains as link" do
ap_id = "https://" <> to_string(:idna.encode("zetsubou.みんな")) <> "/users/lain"
{:ok, _data} = WebFinger.finger(ap_id)
end
end
end

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