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
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
|
# server-server
post '/inbox' do
request.body.rewind # in case someone already read it
@body = request.body.read
halt 400 if @body.empty?
begin
@activity = JSON.parse @body
rescue StandardError
p @body
halt 400
end
halt 501 if @activity['actor'] and @activity['type'] == 'Delete' # deleted actors return 403 => verification error
# verify! # pixelfed sends unsigned activities???
type = @activity['type'].downcase.to_sym
save_activity(@activity, INBOX) unless %i[create announce].include? type
send(type) if %i[create announce follow accept undo].include? type
200
end
# public
get '/' do
redirect 'https://pdp8.info'
end
get '/outbox' do
files = Dir[File.join('outbox', 'create', '*.json')] + Dir[File.join('outbox', 'announce', '*.json')]
activities = files.collect { |f| JSON.load_file(f) }
ids = activities.sort_by { |a| a['published'] }.collect { |a| a['id'] }
{ '@context' => 'https://www.w3.org/ns/activitystreams',
'id' => 'https://social.pdp8.info/outbox',
'type' => 'OrderedCollection',
'totalItems' => ids.size,
'orderedItems' => ids }.to_json
end
get '/pdp8', provides: 'html' do
redirect 'https://pdp8.info'
end
get '/pdp8' do
send_file(File.join(PUBLIC_DIR, 'pdp8.json'), type: CONTENT_TYPE)
end
get '/.well-known/webfinger' do
halt 404 unless request['resource'] == "acct:#{MENTION}"
send_file(WEBFINGER, type: 'application/jrd+json')
end
['/following', '/followers'].each do |path|
get path do
send_file(File.join(PUBLIC_DIR, path) + '.json', type: CONTENT_TYPE)
end
end
get '/tags/:tag' do |tag|
send_file(File.join(PUBLIC_DIR, 'tags', tag) + '.json', type: CONTENT_TYPE)
end
helpers do
def create
@object ||= @activity['object']
@object = save_object @object, INBOX
return unless @object and @object['inReplyTo']
@object = @object['inReplyTo']
create
end
def announce
create
end
def follow
update_collection FOLLOWERS, @activity['actor']
outbox 'Accept', @activity, [@activity['actor']]
end
def accept
halt 501 unless @activity['object']['type'] == 'Follow'
update_collection FOLLOWING, @activity['object']['object']
end
def undo
case @activity['object']['type']
when 'Follow'
update_collection FOLLOWERS, @activity['object']['actor'], true
when 'Create', 'Announce'
file = find_file @activity['object']['id']
FileUtils.rm(file) if file
else
halt 501
end
end
def update
FileUtils.rm(find_file(@activity['object']['id']))
create
end
# https://github.com/mastodon/mastodon/blob/main/app/controllers/concerns/signature_verification.rb
def verify!
# digest
sha256 = OpenSSL::Digest.new('SHA256')
digest = "SHA-256=#{sha256.base64digest(@body)}"
halt 403 unless digest == request.env['HTTP_DIGEST']
# signature
signature_params = {}
request.env['HTTP_SIGNATURE'].split(',').each do |pair|
k, v = pair.split('=')
signature_params[k] = v.gsub('"', '')
end
key_id = signature_params['keyId']
headers = signature_params['headers']
signature = Base64.decode64(signature_params['signature'])
actor = fetch key_id
halt 403 unless actor
key = OpenSSL::PKey::RSA.new(actor['publicKey']['publicKeyPem'])
comparison = headers.split(' ').map do |signed_params_name|
if signed_params_name == '(request-target)'
'(request-target): post /inbox'
elsif signed_params_name == 'content-type'
"#{signed_params_name}: #{request.env['CONTENT_TYPE']}"
else
"#{signed_params_name}: #{request.env["HTTP_#{signed_params_name.upcase}"]}"
end
end.join("\n")
halt 403 unless key.verify(OpenSSL::Digest.new('SHA256'), signature, comparison)
end
def actor_inbox(url)
actor = fetch url
return unless actor
if actor['endpoints'] and actor['endpoints']['sharedInbox']
actor['endpoints']['sharedInbox']
elsif actor['inbox']
actor['inbox']
end
end
def outbox(type, object, to)
# send
## https://github.com/mastodon/mastodon/blob/main/app/lib/request.rb
to = [to] if to.is_a?(String)
inboxes = []
to.uniq.each do |url|
next if [ACTOR, 'https://www.w3.org/ns/activitystreams#Public'].include? url
if url == FOLLOWERS_URL
JSON.load_file(FOLLOWERS)['orderedItems'].each do |follower|
inboxes << actor_inbox(follower)
end
next
end
inboxes << actor_inbox(url)
end
# add date and id, save
activity_path = save_activity({
'@context' => 'https://www.w3.org/ns/activitystreams',
'type' => type,
'actor' => ACTOR,
'object' => object,
'to' => to
}, OUTBOX)
# p activity_path
body = File.read(activity_path)
sha256 = OpenSSL::Digest.new('SHA256')
digest = "SHA-256=#{sha256.base64digest(body)}"
keypair = OpenSSL::PKey::RSA.new(File.read('private.pem'))
inboxes.compact.uniq.each do |inbox|
uri = URI(inbox)
httpdate = Time.now.utc.httpdate
string = "(request-target): post #{uri.request_uri}\nhost: #{uri.host}\ndate: #{httpdate}\ndigest: #{digest}\ncontent-type: #{CONTENT_TYPE}"
signature = Base64.strict_encode64(keypair.sign(OpenSSL::Digest.new('SHA256'), string))
signed_header = "keyId=\"#{ACTOR}#main-key\",algorithm=\"rsa-sha256\",headers=\"(request-target) host date digest content-type\",signature=\"#{signature}\""
# Net::HTTP fails with OpenSSL error
curl(
"-X POST -H 'Host: #{uri.host}' -H 'Date: #{httpdate}' -H 'Digest: #{digest}' -H 'Signature: #{signed_header}' --data-binary '@#{activity_path}'", inbox
)
end
activity_path
end
end
|
