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