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