How do I handle Koala error
After watching Facebook API and Auth Tokens with Koala, I decided to implement it. However, I made a mistake in my logic and went over the limit for the number of API calls. Now I am getting a Koala error
User Load (0.4ms) SELECT "users".* FROM "users" WHERE "users"."provider" = $1 AND "users"."uid" = $2 ORDER BY "users"."id" ASC LIMIT $3 [["provider", "facebook"], ["uid", "#####hidden####"], ["LIMIT", 1]]
↳ app/models/user.rb:30
Completed 500 Internal Server Error in 166ms (ActiveRecord: 0.4ms)
Koala::Facebook::OAuthTokenRequestError (type: OAuthException, code: 190, error_subcode: 460, message: Error validating access token: The session has been invalidated because the user changed their password or Facebook has changed the session for security reasons. [HTTP 400]):
I looked through SO and found this post, which suggests adding a rescue_from:
# app/models/user.rb
def facebook_refresh_token
begin
# Get refreshed 60 day auth token
oauth = Koala::Facebook::OAuth.new(ENV['FACEBOOK_APP_ID'], ENV['FACEBOOK_SECRET'])
new_access_info = oauth.exchange_access_token_info token
update(token: new_access_info['access_token'], token_expires_at: DateTime.now + new_access_info['expires_in'].to_i.seconds)
rescue Koala::Facebook::APIError => exception
if exception.fb_error_type == 190
puts exception
else
raise "Facebook Error: #{exception.fb_error_type}"
end
end
I am not sure if I am putting the rescue in the right place. Do I need to move it? I am also have another place where I get the longed lived access token.
# app/models/user.rb
def self.from_omniauth(auth)
user = User.where(provider: auth.provider, uid: auth.uid).first
# where('email = ?', auth.info.email).first
if user.blank?
# immediately get 60 day auth token
oauth = Koala::Facebook::OAuth.new(ENV["FACEBOOK_APP_ID"], ENV["FACEBOOK_SECRET"])
new_access_info = oauth.exchange_access_token_info auth.credentials.token
new_access_token = new_access_info["access_token"]
# Facebook updated expired attribute
new_access_expires_at = DateTime.now + new_access_info["expires_in"].to_i.seconds
user = User.new
user.provider = auth.provider
user.uid = auth.uid
# some code remove for brevity
# set all the user things
user.save
Obviously I want to handle the exception gracefully, but what do I put in if exception.fb_error_type == 190 ? I don't understand how I would redirect to auth dialog. Your comments, suggestions, and answers are much appreciated.
Edit:
Facebook has a page explaining for how to handle this type of error, but it is only for PHP. I'm not sure how to translate that to Rails...
This should be exception.fb_error_code == 190.
The code might look something like this:
begin
...
rescue Koala::Facebook::APIError => exception
if exception.fb_error_code == 190
format.html {
sign_out(current_user)
redirect_to root_path, alert: exception.fb_error_message
}
else
raise "Facebook Error: #{exception.fb_error_type}"
end
end
