about summary refs log tree commit diff
path: root/app/services/process_feed_service.rb
blob: a2def453513512f7a6389869681441ac0ccd8873 (plain) (blame)
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
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
# frozen_string_literal: true

class ProcessFeedService < BaseService
  def call(body, account)
    xml = Nokogiri::XML(body)
    xml.encoding = 'utf-8'

    update_author(body, account)
    process_entries(xml, account)
  end

  private

  def update_author(body, account)
    RemoteProfileUpdateWorker.perform_async(account.id, body.force_encoding('UTF-8'), true)
  end

  def process_entries(xml, account)
    xml.xpath('//xmlns:entry', xmlns: TagManager::XMLNS).reverse_each.map { |entry| ProcessEntry.new.call(entry, account) }.compact
  end

  class ProcessEntry
    def call(xml, account)
      @account = account
      @xml     = xml

      return if skip_unsupported_type?

      case verb
      when :post, :share
        return create_status
      when :delete
        return delete_status
      end
    rescue ActiveRecord::RecordInvalid => e
      Rails.logger.debug "Nothing was saved for #{id} because: #{e}"
      nil
    end

    private

    def create_status
      Rails.logger.debug "Creating remote status #{id}"
      status, just_created = status_from_xml(@xml)

      return if status.nil?
      return status unless just_created

      if verb == :share
        original_status, = status_from_xml(@xml.at_xpath('.//activity:object', activity: TagManager::AS_XMLNS))
        status.reblog    = original_status

        if original_status.nil?
          status.destroy
          return nil
        elsif original_status.reblog?
          status.reblog = original_status.reblog
        end
      end

      status.save!

      notify_about_mentions!(status) unless status.reblog?
      notify_about_reblog!(status) if status.reblog? && status.reblog.account.local?
      Rails.logger.debug "Queuing remote status #{status.id} (#{id}) for distribution"
      DistributionWorker.perform_async(status.id)
      status
    end

    def notify_about_mentions!(status)
      status.mentions.includes(:account).each do |mention|
        mentioned_account = mention.account
        next unless mentioned_account.local?
        NotifyService.new.call(mentioned_account, mention)
      end
    end

    def notify_about_reblog!(status)
      NotifyService.new.call(status.reblog.account, status)
    end

    def delete_status
      Rails.logger.debug "Deleting remote status #{id}"
      status = Status.find_by(uri: id)
      RemoveStatusService.new.call(status) unless status.nil?
      nil
    end

    def skip_unsupported_type?
      !([:post, :share, :delete].include?(verb) && [:activity, :note, :comment].include?(type))
    end

    def status_from_xml(entry)
      # Return early if status already exists in db
      status = find_status(id(entry))

      return [status, false] unless status.nil?

      # If status embeds an author, find that author
      # If that author cannot be found, don't record the status (do not misattribute)
      if account?(entry)
        begin
          account = find_or_resolve_account(acct(entry))
          return [nil, false] if account.nil?
        rescue Goldfinger::Error
          return [nil, false]
        end
      else
        account = @account
      end

      return [nil, false] if account.suspended?

      status = Status.create!(
        uri: id(entry),
        url: url(entry),
        account: account,
        text: content(entry),
        spoiler_text: content_warning(entry),
        created_at: published(entry),
        reply: thread?(entry),
        visibility: visibility_scope(entry)
      )

      if thread?(entry)
        Rails.logger.debug "Trying to attach #{status.id} (#{id(entry)}) to #{thread(entry).first}"
        status.thread = find_or_resolve_status(status, *thread(entry))
      end

      mentions_from_xml(status, entry)
      hashtags_from_xml(status, entry)
      media_from_xml(status, entry)

      [status, true]
    end

    def find_or_resolve_account(acct)
      FollowRemoteAccountService.new.call(acct)
    end

    def find_or_resolve_status(parent, uri, url)
      status = find_status(uri)

      ThreadResolveWorker.perform_async(parent.id, url) if status.nil?

      status
    end

    def find_status(uri)
      if TagManager.instance.local_id?(uri)
        local_id = TagManager.instance.unique_tag_to_local_id(uri, 'Status')
        return Status.find(local_id)
      end

      Status.find_by(uri: uri)
    end

    def mentions_from_xml(parent, xml)
      processed_account_ids = []

      xml.xpath('./xmlns:link[@rel="mentioned"]', xmlns: TagManager::XMLNS).each do |link|
        next if [TagManager::TYPES[:group], TagManager::TYPES[:collection]].include? link['ostatus:object-type']

        url = Addressable::URI.parse(link['href'])

        mentioned_account = if TagManager.instance.local_domain?(url.host)
                              Account.find_local(url.path.gsub('/users/', ''))
                            else
                              Account.find_by(url: link['href']) || FetchRemoteAccountService.new.call(link['href'])
                            end

        next if mentioned_account.nil? || processed_account_ids.include?(mentioned_account.id)

        mentioned_account.mentions.where(status: parent).first_or_create(status: parent)

        # So we can skip duplicate mentions
        processed_account_ids << mentioned_account.id
      end
    end

    def hashtags_from_xml(parent, xml)
      tags = xml.xpath('./xmlns:category', xmlns: TagManager::XMLNS).map { |category| category['term'] }.select { |t| !t.blank? }
      ProcessHashtagsService.new.call(parent, tags)
    end

    def media_from_xml(parent, xml)
      return if DomainBlock.find_by(domain: parent.account.domain)&.reject_media?

      xml.xpath('./xmlns:link[@rel="enclosure"]', xmlns: TagManager::XMLNS).each do |link|
        next unless link['href']

        media = MediaAttachment.where(status: parent, remote_url: link['href']).first_or_initialize(account: parent.account, status: parent, remote_url: link['href'])
        parsed_url = URI.parse(link['href'])

        next if !%w(http https).include?(parsed_url.scheme) || parsed_url.host.empty?

        begin
          media.file_remote_url = link['href']
          media.save
        rescue OpenURI::HTTPError, Paperclip::Errors::NotIdentifiedByImageMagickError
          next
        end
      end
    end

    def id(xml = @xml)
      xml.at_xpath('./xmlns:id', xmlns: TagManager::XMLNS).content
    end

    def verb(xml = @xml)
      raw = xml.at_xpath('./activity:verb', activity: TagManager::AS_XMLNS).content
      TagManager::VERBS.key(raw)
    rescue
      :post
    end

    def type(xml = @xml)
      raw = xml.at_xpath('./activity:object-type', activity: TagManager::AS_XMLNS).content
      TagManager::TYPES.key(raw)
    rescue
      :activity
    end

    def url(xml = @xml)
      link = xml.at_xpath('./xmlns:link[@rel="alternate"]', xmlns: TagManager::XMLNS)
      link.nil? ? nil : link['href']
    end

    def content(xml = @xml)
      xml.at_xpath('./xmlns:content', xmlns: TagManager::XMLNS).content
    end

    def content_warning(xml = @xml)
      xml.at_xpath('./xmlns:summary', xmlns: TagManager::XMLNS)&.content || ''
    end

    def visibility_scope(xml = @xml)
      xml.at_xpath('./mastodon:scope', mastodon: TagManager::MTDN_XMLNS)&.content&.to_sym || :public
    end

    def published(xml = @xml)
      xml.at_xpath('./xmlns:published', xmlns: TagManager::XMLNS).content
    end

    def thread?(xml = @xml)
      !xml.at_xpath('./thr:in-reply-to', thr: TagManager::THR_XMLNS).nil?
    end

    def thread(xml = @xml)
      thr = xml.at_xpath('./thr:in-reply-to', thr: TagManager::THR_XMLNS)
      [thr['ref'], thr['href']]
    end

    def account?(xml = @xml)
      !xml.at_xpath('./xmlns:author', xmlns: TagManager::XMLNS).nil?
    end

    def acct(xml = @xml)
      username = xml.at_xpath('./xmlns:author/xmlns:name', xmlns: TagManager::XMLNS).content
      url      = xml.at_xpath('./xmlns:author/xmlns:uri', xmlns: TagManager::XMLNS).content
      domain   = Addressable::URI.parse(url).host

      "#{username}@#{domain}"
    end
  end
end