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
|
# Pleroma: A lightweight social networking server
# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only
defmodule Pleroma.Object.Fetcher do
alias Pleroma.HTTP
alias Pleroma.Object
alias Pleroma.Object.Containment
alias Pleroma.Signature
alias Pleroma.Web.ActivityPub.InternalFetchActor
alias Pleroma.Web.ActivityPub.Transmogrifier
alias Pleroma.Web.OStatus
require Logger
defp reinject_object(data) do
Logger.debug("Reinjecting object #{data["id"]}")
with data <- Transmogrifier.fix_object(data),
{:ok, object} <- Object.create(data) do
{:ok, object}
else
e ->
Logger.error("Error while processing object: #{inspect(e)}")
{:error, e}
end
end
# TODO:
# This will create a Create activity, which we need internally at the moment.
def fetch_object_from_id(id, options \\ []) do
if object = Object.get_cached_by_ap_id(id) do
{:ok, object}
else
Logger.info("Fetching #{id} via AP")
with {:fetch, {:ok, data}} <- {:fetch, fetch_and_contain_remote_object_from_id(id)},
{:normalize, nil} <- {:normalize, Object.normalize(data, false)},
params <- %{
"type" => "Create",
"to" => data["to"],
"cc" => data["cc"],
# Should we seriously keep this attributedTo thing?
"actor" => data["actor"] || data["attributedTo"],
"object" => data
},
{:containment, :ok} <- {:containment, Containment.contain_origin(id, params)},
{:ok, activity} <- Transmogrifier.handle_incoming(params, options),
{:object, _data, %Object{} = object} <-
{:object, data, Object.normalize(activity, false)} do
{:ok, object}
else
{:containment, _} ->
{:error, "Object containment failed."}
{:error, {:reject, nil}} ->
{:reject, nil}
{:object, data, nil} ->
reinject_object(data)
{:normalize, object = %Object{}} ->
{:ok, object}
_e ->
# Only fallback when receiving a fetch/normalization error with ActivityPub
Logger.info("Couldn't get object via AP, trying out OStatus fetching...")
# FIXME: OStatus Object Containment?
case OStatus.fetch_activity_from_url(id) do
{:ok, [activity | _]} -> {:ok, Object.normalize(activity, false)}
e -> e
end
end
end
end
def fetch_object_from_id!(id, options \\ []) do
with {:ok, object} <- fetch_object_from_id(id, options) do
object
else
_e ->
nil
end
end
defp make_signature(id, date) do
uri = URI.parse(id)
signature =
InternalFetchActor.get_actor()
|> Signature.sign(%{
"(request-target)": "get #{uri.path}",
host: uri.host,
date: date
})
[{"signature", signature}]
end
defp sign_fetch(headers, id, date) do
if Pleroma.Config.get([:activitypub, :sign_object_fetches]) do
headers ++ make_signature(id, date)
else
headers
end
end
defp maybe_date_fetch(headers, date) do
if Pleroma.Config.get([:activitypub, :sign_object_fetches]) do
headers ++ [{"date", date}]
else
headers
end
end
def fetch_and_contain_remote_object_from_id(id) when is_binary(id) do
Logger.info("Fetching object #{id} via AP")
date = Pleroma.Signature.signed_date()
headers =
[{"accept", "application/activity+json"}]
|> maybe_date_fetch(date)
|> sign_fetch(id, date)
Logger.debug("Fetch headers: #{inspect(headers)}")
with true <- String.starts_with?(id, "http"),
{:ok, %{body: body, status: code}} when code in 200..299 <- HTTP.get(id, headers),
{:ok, data} <- Jason.decode(body),
:ok <- Containment.contain_origin_from_id(id, data) do
{:ok, data}
else
{:ok, %{status: code}} when code in [404, 410] ->
{:error, "Object has been deleted"}
e ->
{:error, e}
end
end
def fetch_and_contain_remote_object_from_id(%{"id" => id}),
do: fetch_and_contain_remote_object_from_id(id)
def fetch_and_contain_remote_object_from_id(_id), do: {:error, "id must be a string"}
end
|
