Method: Koala::Facebook::OAuth#generate_client_code

Defined in:
lib/koala/oauth.rb

#generate_client_code(access_token) ⇒ Object

Generates a ‘client code’ from a server side long-lived access token. With the generated code, it can be sent to a client application which can then use it to get a long-lived access token from Facebook. After which the clients can use that access token to make requests to Facebook without having to use the server token, yet the server access token remains valid. See developers.facebook.com/docs/facebook-login/access-tokens/#long-via-code

Parameters:

  • access_token —

    a user’s long lived (server) access token

Returns:

  • a string of the generated ‘code’

Raises:

  • Koala::Facebook::ServerError if Facebook returns a server error (status >= 500)

  • Koala::Facebook::OAuthTokenRequestError if Facebook returns an error response (status >= 400)

  • Koala::Facebook::BadFacebookResponse if Facebook returns a blank response

  • Koala::KoalaError if response does not contain ‘code’ hash key



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# File 'lib/koala/oauth.rb', line 150

def generate_client_code(access_token)
  response = fetch_token_string({:redirect_uri => @oauth_callback_url, :access_token => access_token}, false, 'client_code')

  # Facebook returns an empty body in certain error conditions
  if response == ''
    raise BadFacebookResponse.new(200, '', 'generate_client_code received an error: empty response body')
  else
    result = MultiJson.load(response)
  end

  result.has_key?('code') ? result['code'] : raise(Koala::KoalaError.new("Facebook returned a valid response without the expected 'code' in the body (response = #{response})"))
end