forked from fedi/mastodon
80 lines
2.1 KiB
Ruby
80 lines
2.1 KiB
Ruby
# frozen_string_literal: true
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class TranslationService::DeepL < TranslationService
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include JsonLdHelper
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def initialize(plan, api_key)
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super()
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@plan = plan
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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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form = { text: text, source_lang: source_language&.upcase, target_lang: target_language, tag_handling: 'html' }
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request(:post, '/v2/translate', form: form) do |res|
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transform_response(res.body_with_limit)
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end
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end
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def languages
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source_languages = [nil] + fetch_languages('source')
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# In DeepL, EN and PT are deprecated in favor of EN-GB/EN-US and PT-BR/PT-PT, so
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# they are supported but not returned by the API.
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target_languages = %w(en pt) + fetch_languages('target')
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source_languages.index_with { |language| target_languages.without(nil, language) }
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end
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private
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def fetch_languages(type)
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request(:get, "/v2/languages?type=#{type}") do |res|
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Oj.load(res.body_with_limit).map { |language| normalize_language(language['language']) }
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end
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end
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def normalize_language(language)
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subtags = language.split(/[_-]/)
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subtags[0].downcase!
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subtags[1]&.upcase!
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subtags.join('-')
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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}", **options)
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req.add_headers(Authorization: "DeepL-Auth-Key #{@api_key}")
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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 456
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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 base_url
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if @plan == 'free'
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'https://api-free.deepl.com'
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else
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'https://api.deepl.com'
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end
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end
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def transform_response(str)
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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.dig('translations', 0, 'text'), detected_source_language: json.dig('translations', 0, 'detected_source_language')&.downcase, provider: 'DeepL.com')
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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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