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60 lines
1.8 KiB
60 lines
1.8 KiB
# frozen_string_literal: true
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class TranslationService::LibreTranslate < TranslationService
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def initialize(base_url, api_key)
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super()
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@base_url = base_url
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@api_key = api_key
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end
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def translate(text, source_language, target_language)
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body = Oj.dump(q: text, source: source_language.presence || 'auto', target: target_language, format: 'html', api_key: @api_key)
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request(:post, '/translate', body: body) do |res|
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transform_response(res.body_with_limit, source_language)
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end
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end
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def supported?(source_language, target_language)
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languages.key?(source_language) && languages[source_language].include?(target_language)
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end
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private
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def languages
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Rails.cache.fetch('translation_service/libre_translate/languages', expires_in: 7.days, race_condition_ttl: 1.minute) do
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request(:get, '/languages') do |res|
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languages = Oj.load(res.body_with_limit).to_h { |language| [language['code'], language['targets']] }
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languages[nil] = languages.values.flatten.uniq
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languages
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end
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end
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end
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def request(verb, path, **options)
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req = Request.new(verb, "#{@base_url}#{path}", allow_local: true, **options)
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req.add_headers('Content-Type': 'application/json')
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req.perform do |res|
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case res.code
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when 429
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raise TooManyRequestsError
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when 403
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raise QuotaExceededError
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when 200...300
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yield res
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else
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raise UnexpectedResponseError
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end
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end
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end
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def transform_response(str, source_language)
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json = Oj.load(str, mode: :strict)
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raise UnexpectedResponseError unless json.is_a?(Hash)
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Translation.new(text: json['translatedText'], detected_source_language: source_language, provider: 'LibreTranslate')
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rescue Oj::ParseError
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raise UnexpectedResponseError
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end
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end
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