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mastodon/app/validators/status_length_validator.rb

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1.6 KiB

# frozen_string_literal: true
class StatusLengthValidator < ActiveModel::Validator
MAX_CHARS = (ENV['MAX_TOOT_CHARS'] || 500).to_i
URL_PLACEHOLDER_CHARS = 23
URL_PLACEHOLDER = 'x' * 23
def validate(status)
return unless status.local? && !status.reblog?
status.errors.add(:text, I18n.t('statuses.over_character_limit', max: MAX_CHARS)) if too_long?(status)
end
private
def too_long?(status)
countable_length(combined_text(status)) > MAX_CHARS
end
def countable_length(str)
str.mb_chars.grapheme_length
end
def combined_text(status)
[status.spoiler_text, countable_text(status.text)].join
end
def countable_text(str)
return '' if str.blank?
# To ensure that we only give length concessions to entities that
# will be correctly parsed during formatting, we go through full
# entity extraction
entities = Extractor.remove_overlapping_entities(Extractor.extract_urls_with_indices(str, extract_url_without_protocol: false) + Extractor.extract_mentions_or_lists_with_indices(str))
rewrite_entities(str, entities) do |entity|
if entity[:url]
URL_PLACEHOLDER
elsif entity[:screen_name]
"@#{entity[:screen_name].split('@').first}"
end
end
end
def rewrite_entities(str, entities)
entities.sort_by! { |entity| entity[:indices].first }
result = ''.dup
last_index = entities.reduce(0) do |index, entity|
result << str[index...entity[:indices].first]
result << yield(entity)
entity[:indices].last
end
result << str[last_index..-1]
result
end
end