1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
|
# Pleroma: A lightweight social networking server
# Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only
defmodule Pleroma.Web.TwitterAPI.RemoteFollowController do
use Pleroma.Web, :controller
require Logger
alias Pleroma.Activity
alias Pleroma.MFA
alias Pleroma.Object.Fetcher
alias Pleroma.User
alias Pleroma.Web.Auth.TOTPAuthenticator
alias Pleroma.Web.Auth.WrapperAuthenticator
alias Pleroma.Web.CommonAPI
@status_types ["Article", "Event", "Note", "Video", "Page", "Question"]
plug(Pleroma.Web.Plugs.FederatingPlug)
# Note: follower can submit the form (with password auth) not being signed in (having no token)
plug(
Pleroma.Web.Plugs.OAuthScopesPlug,
%{fallback: :proceed_unauthenticated, scopes: ["follow", "write:follows"]}
when action in [:do_follow]
)
# GET /ostatus_subscribe
#
def follow(%{assigns: %{user: user}} = conn, %{"acct" => acct}) do
case is_status?(acct) do
true -> follow_status(conn, user, acct)
_ -> follow_account(conn, user, acct)
end
end
defp follow_status(conn, _user, acct) do
with {:ok, object} <- Fetcher.fetch_object_from_id(acct),
%Activity{id: activity_id} <- Activity.get_create_by_object_ap_id(object.data["id"]) do
redirect(conn, to: Routes.o_status_path(conn, :notice, activity_id))
else
error ->
handle_follow_error(conn, error)
end
end
defp follow_account(conn, user, acct) do
with {:ok, followee} <- User.get_or_fetch(acct) do
render(conn, follow_template(user), %{error: false, followee: followee, acct: acct})
else
{:error, _reason} ->
render(conn, follow_template(user), %{error: :error})
end
end
defp follow_template(%User{} = _user), do: "follow.html"
defp follow_template(_), do: "follow_login.html"
defp is_status?(acct) do
case Fetcher.fetch_and_contain_remote_object_from_id(acct) do
{:ok, %{"type" => type}} when type in @status_types ->
true
_ ->
false
end
end
# POST /ostatus_subscribe
#
# adds a remote account in followers if user already is signed in.
#
def do_follow(%{assigns: %{user: %User{} = user}} = conn, %{"user" => %{"id" => id}}) do
with {:fetch_user, %User{} = followee} <- {:fetch_user, User.get_cached_by_id(id)},
{:ok, _, _, _} <- CommonAPI.follow(user, followee) do
redirect(conn, to: "/users/#{followee.id}")
else
error ->
handle_follow_error(conn, error)
end
end
# POST /ostatus_subscribe
#
# step 1.
# checks login\password and displays step 2 form of MFA if need.
#
def do_follow(conn, %{"authorization" => %{"name" => _, "password" => _, "id" => id}}) do
with {_, %User{} = followee} <- {:fetch_user, User.get_cached_by_id(id)},
{_, {:ok, user}, _} <- {:auth, WrapperAuthenticator.get_user(conn), followee},
{_, _, _, false} <- {:mfa_required, followee, user, MFA.require?(user)},
{:ok, _, _, _} <- CommonAPI.follow(user, followee) do
redirect(conn, to: "/users/#{followee.id}")
else
error ->
handle_follow_error(conn, error)
end
end
# POST /ostatus_subscribe
#
# step 2
# checks TOTP code. otherwise displays form with errors
#
def do_follow(conn, %{"mfa" => %{"code" => code, "token" => token, "id" => id}}) do
with {_, %User{} = followee} <- {:fetch_user, User.get_cached_by_id(id)},
{_, _, {:ok, %{user: user}}} <- {:mfa_token, followee, MFA.Token.validate(token)},
{_, _, _, {:ok, _}} <-
{:verify_mfa_code, followee, token, TOTPAuthenticator.verify(code, user)},
{:ok, _, _, _} <- CommonAPI.follow(user, followee) do
redirect(conn, to: "/users/#{followee.id}")
else
error ->
handle_follow_error(conn, error)
end
end
def do_follow(%{assigns: %{user: nil}} = conn, _) do
Logger.debug("Insufficient permissions: follow | write:follows.")
render(conn, "followed.html", %{error: "Insufficient permissions: follow | write:follows."})
end
defp handle_follow_error(conn, {:mfa_token, followee, _} = _) do
render(conn, "follow_login.html", %{error: "Wrong username or password", followee: followee})
end
defp handle_follow_error(conn, {:verify_mfa_code, followee, token, _} = _) do
render(conn, "follow_mfa.html", %{
error: "Wrong authentication code",
followee: followee,
mfa_token: token
})
end
defp handle_follow_error(conn, {:mfa_required, followee, user, _} = _) do
{:ok, %{token: token}} = MFA.Token.create(user)
render(conn, "follow_mfa.html", %{followee: followee, mfa_token: token, error: false})
end
defp handle_follow_error(conn, {:auth, _, followee} = _) do
render(conn, "follow_login.html", %{error: "Wrong username or password", followee: followee})
end
defp handle_follow_error(conn, {:fetch_user, error} = _) do
Logger.debug("Remote follow failed with error #{inspect(error)}")
render(conn, "followed.html", %{error: "Could not find user"})
end
defp handle_follow_error(conn, {:error, "Could not follow user:" <> _} = _) do
render(conn, "followed.html", %{error: "Error following account"})
end
defp handle_follow_error(conn, error) do
Logger.debug("Remote follow failed with error #{inspect(error)}")
render(conn, "followed.html", %{error: "Something went wrong."})
end
end
|
