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Fix URL scanning in note length validator and preview card fetching (#15827)

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* Add tests

* Fix URL scanning in note length validator and preview card fetching
This commit is contained in:
Claire 2021-03-04 00:12:26 +01:00 committed by GitHub
parent 65db262550
commit 5614e6724e
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6 changed files with 52 additions and 16 deletions
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2
app/lib/language_detector.rb
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@ -69,7 +69,7 @@ class LanguageDetector
def simplify_text(text)
new_text = remove_html(text)
new_text.gsub!(FetchLinkCardService::URL_PATTERN, '')
new_text.gsub!(FetchLinkCardService::URL_PATTERN, '\1')
new_text.gsub!(Account::MENTION_RE, '')
new_text.gsub!(Tag::HASHTAG_RE) { |string| string.gsub(/[#_]/, '#' => '', '_' => ' ').gsub(/[a-z][A-Z]|[a-zA-Z][\d]/) { |s| s.insert(1, ' ') }.downcase }
new_text.gsub!(/:#{CustomEmoji::SHORTCODE_RE_FRAGMENT}:/, '')

15
app/services/fetch_link_card_service.rb
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@ -2,12 +2,13 @@
class FetchLinkCardService < BaseService
URL_PATTERN = %r{
( # $1 URL
(https?:\/\/) # $2 Protocol (required)
(#{Twitter::TwitterText::Regex[:valid_domain]}) # $3 Domain(s)
(?::(#{Twitter::TwitterText::Regex[:valid_port_number]}))? # $4 Port number (optional)
(/#{Twitter::TwitterText::Regex[:valid_url_path]}*)? # $5 URL Path and anchor
(\?#{Twitter::TwitterText::Regex[:valid_url_query_chars]}*#{Twitter::TwitterText::Regex[:valid_url_query_ending_chars]})? # $6 Query String
(#{Twitter::TwitterText::Regex[:valid_url_preceding_chars]}) # $1 preceeding chars
( # $2 URL
(https?:\/\/) # $3 Protocol (required)
(#{Twitter::TwitterText::Regex[:valid_domain]}) # $4 Domain(s)
(?::(#{Twitter::TwitterText::Regex[:valid_port_number]}))? # $5 Port number (optional)
(/#{Twitter::TwitterText::Regex[:valid_url_path]}*)? # $6 URL Path and anchor
(\?#{Twitter::TwitterText::Regex[:valid_url_query_chars]}*#{Twitter::TwitterText::Regex[:valid_url_query_ending_chars]})? # $7 Query String
)
}iox
@ -63,7 +64,7 @@ class FetchLinkCardService < BaseService
def parse_urls
if @status.local?
urls = @status.text.scan(URL_PATTERN).map { |array| Addressable::URI.parse(array[0]).normalize }
urls = @status.text.scan(URL_PATTERN).map { |array| Addressable::URI.parse(array[1]).normalize }
else
html = Nokogiri::HTML(@status.text)
links = html.css('a')

2
app/validators/note_length_validator.rb
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@ -15,7 +15,7 @@ class NoteLengthValidator < ActiveModel::EachValidator
return '' if value.nil?
value.dup.tap do |new_text|
new_text.gsub!(FetchLinkCardService::URL_PATTERN, 'x' * 23)
new_text.gsub!(FetchLinkCardService::URL_PATTERN, StatusLengthValidator::URL_PLACEHOLDER)
new_text.gsub!(Account::MENTION_RE, '@\2')
end
end

8
app/validators/status_length_validator.rb
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@ -2,12 +2,6 @@
class StatusLengthValidator < ActiveModel::Validator
MAX_CHARS = 500
URL_PATTERN = %r{
(?:
(#{Twitter::TwitterText::Regex[:valid_url_preceding_chars]})
(#{FetchLinkCardService::URL_PATTERN})
)
}iox
URL_PLACEHOLDER = "\1#{'x' * 23}"
def validate(status)
@ -35,7 +29,7 @@ class StatusLengthValidator < ActiveModel::Validator
return '' if @status.text.nil?
@status.text.dup.tap do |new_text|
new_text.gsub!(URL_PATTERN, URL_PLACEHOLDER)
new_text.gsub!(FetchLinkCardService::URL_PATTERN, URL_PLACEHOLDER)
new_text.gsub!(Account::MENTION_RE, '@\2')
end
end

8
spec/services/fetch_link_card_service_spec.rb
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@ -77,6 +77,14 @@ RSpec.describe FetchLinkCardService, type: :service do
expect(a_request(:get, 'http://example.com/test-')).to have_been_made.at_least_once
end
end
context do
let(:status) { Fabricate(:status, text: 'testhttp://example.com/sjis') }
it 'does not fetch URLs with not isolated from their surroundings' do
expect(a_request(:get, 'http://example.com/sjis')).to_not have_been_made
end
end
end
context 'in a remote status' do

33
spec/validators/note_length_validator_spec.rb Normal file
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@ -0,0 +1,33 @@
# frozen_string_literal: true
require 'rails_helper'
describe NoteLengthValidator do
subject { NoteLengthValidator.new(attributes: { note: true }, maximum: 500) }
describe '#validate' do
it 'adds an error when text is over 500 characters' do
text = 'a' * 520
account = double(note: text, errors: double(add: nil))
subject.validate_each(account, 'note', text)
expect(account.errors).to have_received(:add)
end
it 'counts URLs as 23 characters flat' do
text = ('a' * 476) + " http://#{'b' * 30}.com/example"
account = double(note: text, errors: double(add: nil))
subject.validate_each(account, 'note', text)
expect(account.errors).to_not have_received(:add)
end
it 'does not count non-autolinkable URLs as 23 characters flat' do
text = ('a' * 476) + "http://#{'b' * 30}.com/example"
account = double(note: text, errors: double(add: nil))
subject.validate_each(account, 'note', text)
expect(account.errors).to have_received(:add)
end
end
end