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Hook up URL-based resource look-up to ActivityPub (#4589)

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This commit is contained in:
Eugen Rochko 2017-08-14 02:29:36 +02:00 • committed by GitHub
parent a2aeacbfee
commit 4e75f0d889
8 changed files with 95 additions and 60 deletions
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78
app/services/fetch_atom_service.rb
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@ -4,18 +4,10 @@ class FetchAtomService < BaseService
def call(url)
return if url.blank?
response = Request.new(:head, url).perform
@url = url
Rails.logger.debug "Remote status HEAD request returned code #{response.code}"
response = Request.new(:get, url).perform if response.code == 405
Rails.logger.debug "Remote status GET request returned code #{response.code}"
return nil if response.code != 200
return [url, fetch(url)] if response.mime_type == 'application/atom+xml'
return process_headers(url, response) if response['Link'].present?
process_html(fetch(url))
perform_request
process_response
rescue OpenSSL::SSL::SSLError => e
Rails.logger.debug "SSL error: #{e}"
nil
@ -26,27 +18,57 @@ class FetchAtomService < BaseService
private
def process_html(body)
Rails.logger.debug 'Processing HTML'
page = Nokogiri::HTML(body)
alternate_link = page.xpath('//link[@rel="alternate"]').find { |link| link['type'] == 'application/atom+xml' }
return nil if alternate_link.nil?
[alternate_link['href'], fetch(alternate_link['href'])]
def perform_request
@response = Request.new(:get, @url)
.add_headers('Accept' => 'application/activity+json, application/ld+json, application/atom+xml, text/html')
.perform
end
def process_headers(url, response)
Rails.logger.debug 'Processing link header'
def process_response(terminal = false)
return nil if @response.code != 200
link_header = LinkHeader.parse(response['Link'].is_a?(Array) ? response['Link'].first : response['Link'])
alternate_link = link_header.find_link(%w(rel alternate), %w(type application/atom+xml))
return process_html(fetch(url)) if alternate_link.nil?
[alternate_link.href, fetch(alternate_link.href)]
if @response.mime_type == 'application/atom+xml'
[@url, @response.to_s, :ostatus]
elsif ['application/activity+json', 'application/ld+json; profile="https://www.w3.org/ns/activitystreams"'].include?(@response.mime_type)
[@url, @response.to_s, :activitypub]
elsif @response['Link'] && !terminal
process_headers
elsif @response.mime_type == 'text/html' && !terminal
process_html
end
end
def fetch(url)
Request.new(:get, url).perform.to_s
def process_html
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' }
if !json_link.nil?
@url = json_link['href']
perform_request
process_response(true)
elsif !atom_link.nil?
@url = atom_link['href']
perform_request
process_response(true)
end
end
def process_headers
link_header = LinkHeader.parse(@response['Link'].is_a?(Array) ? @response['Link'].first : @response['Link'])
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))
if !json_link.nil?
@url = json_link.href
perform_request
process_response(true)
elsif !atom_link.nil?
@url = atom_link.href
perform_request
process_response(true)
end
end
end