class OxfordSpeechApi

# File lib/oxford-speech-api.rb, line 6
def initialize(client, secret)
  @client = client
  @secret = secret
end

# File lib/oxford-speech-api.rb, line 11
def speech2text(file, codec, rate)
  params = {
      :scenarios => 'ulm',
      :appID => 'D4D52672-91D7-4C74-8AD8-42B1D98141A5',
      :locale => 'en-US',
      'device.os' => 'Oxford Speech Client',
      :version => '3.0',
      :format => 'json',
      :requestid => SecureRandom.uuid,
      :instanceid => SecureRandom.uuid
  }
  data = File.read(file)
  headers = {
      :content_type => codec.to_s + '; samplerate=' + rate.to_s,
      :content_length => data.size,
      :authorization => 'Bearer ' + get_access_token
  }
  response = RestClient.post 'https://speech.platform.bing.com/recognize/query?' + URI.encode_www_form(params), data, headers
  JSON.parse(response)
end

# File lib/oxford-speech-api.rb, line 32
def text2speech(text)
  headers = {
      :content_type => 'application/ssml+xml',
      'X-Microsoft-OutputFormat' => 'riff-8khz-8bit-mono-mulaw',
      'X-Search-AppId' => SecureRandom.uuid.gsub(/[^0-9a-z ]/i, ''),
      'X-Search-ClientID' => SecureRandom.uuid.gsub(/[^0-9a-z ]/i, ''),
      :user_agent => @client,
      'X-Search-PartnerEventID' => SecureRandom.uuid.gsub(/[^0-9a-z ]/i, ''),
      :authorization => 'Bearer ' + get_access_token
  }

  data = "<speak version='1.0' xml:lang='en-US'><voice xml:lang='en-US' xml:gender='Female' name='Microsoft Server Speech Text to Speech Voice (en-US, ZiraRUS)'>" + text + "</voice></speak>"
  response = RestClient.post 'https://speech.platform.bing.com/synthesize', data, headers
end

# File lib/oxford-speech-api.rb, line 49
def get_access_token
  params = {
      :grant_type => 'client_credentials',
      :client_id => @client,
      :client_secret => @secret,
      :scope => 'https://speech.platform.bing.com'
  }
  response = RestClient.post 'https://oxford-speech.cloudapp.net/token/issueToken', params
  json = JSON.parse(response)

  json['access_token']
end