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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 languages
request(:get, '/languages') do |res|
languages = Oj.load(res.body_with_limit).to_h do |language|
[language['code'], language['targets'].without(language['code'])]
end
languages[nil] = languages.values.flatten.uniq.sort
languages
end
end
private
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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