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
|
# frozen_string_literal: true
class FetchAtomService < BaseService
include JsonLdHelper
def call(url)
return if url.blank?
result = process(url)
# retry without ActivityPub
result ||= process(url) if @unsupported_activity
result
rescue OpenSSL::SSL::SSLError => e
Rails.logger.debug "SSL error: #{e}"
nil
rescue HTTP::ConnectionError => e
Rails.logger.debug "HTTP ConnectionError: #{e}"
nil
end
private
def process(url, terminal = false)
@url = url
perform_request { |response| process_response(response, terminal) }
end
def perform_request(&block)
accept = 'text/html'
accept = 'application/activity+json, application/ld+json, application/atom+xml, ' + accept unless @unsupported_activity
Request.new(:get, @url).add_headers('Accept' => accept).perform(&block)
end
def process_response(response, terminal = false)
return nil if response.code != 200
if response.mime_type == 'application/atom+xml'
[@url, { prefetched_body: response.to_s }, :ostatus]
elsif ['application/activity+json', 'application/ld+json; profile="https://www.w3.org/ns/activitystreams"'].include?(response.mime_type)
json = body_to_json(response.to_s)
if supported_context?(json) && json['type'] == 'Person' && json['inbox'].present?
[json['id'], { prefetched_body: response.to_s, id: true }, :activitypub]
elsif supported_context?(json) && json['type'] == 'Note'
[json['id'], { prefetched_body: response.to_s, id: true }, :activitypub]
else
@unsupported_activity = true
nil
end
elsif !terminal
link_header = response['Link'] && parse_link_header(response)
if link_header&.find_link(%w(rel alternate))
process_link_headers(link_header)
elsif response.mime_type == 'text/html'
process_html(response)
end
end
end
def process_html(response)
page = Nokogiri::HTML(response.to_s)
json_link = page.xpath('//link[@rel="alternate"]').find { |link| ['application/activity+json', 'application/ld+json; profile="https://www.w3.org/ns/activitystreams"'].include?(link['type']) }
atom_link = page.xpath('//link[@rel="alternate"]').find { |link| link['type'] == 'application/atom+xml' }
result ||= process(json_link['href'], terminal: true) unless json_link.nil? || @unsupported_activity
result ||= process(atom_link['href'], terminal: true) unless atom_link.nil?
result
end
def process_link_headers(link_header)
json_link = link_header.find_link(%w(rel alternate), %w(type application/activity+json)) || link_header.find_link(%w(rel alternate), ['type', 'application/ld+json; profile="https://www.w3.org/ns/activitystreams"'])
atom_link = link_header.find_link(%w(rel alternate), %w(type application/atom+xml))
result ||= process(json_link.href, terminal: true) unless json_link.nil? || @unsupported_activity
result ||= process(atom_link.href, terminal: true) unless atom_link.nil?
result
end
def parse_link_header(response)
LinkHeader.parse(response['Link'].is_a?(Array) ? response['Link'].first : response['Link'])
end
end
|
