Category: Web Development

Breaking the Internet

Paypal_Adaptive IPN Verification: INVALID – Ruby on Rails

Hey everyone,

I’ve been working with the PayPal_Adaptive gem recently and unfortunately I’ve run into a few issues. The latest of these has been that that my IPN verification was returning an INVALID response from Paypal.

I had made a few modifications to the provided payment_notification.rb file in order to accommodate for a few app specific requirements. This left me having to pass the original data attribute params. Unfortunately this wasn’t identical to the response that PayPal expected, I actually needed to use the following:


#Incorrect usage
verify_ipn(params)

#Correct usage
verify_ipn(request.raw_post)

I realised this error after reading Tanel’s post about securing your IPN interactions so make sure you check out his blog if you run into any more problems!

Thanks,
Chris

How to Reset ID of an Element – jQuery

Hey All,

Just a quick post on how to set the ID of an element (in this case a div) with jQuery. I needed to use this to dynamically clone elements.




     WOOOOOOOOOOOOW




     $('#my_test_id').attr('id', 'my_new_id');

The script above sets the id of div to my_new_id. If you’re interested, there’s a whole heap of documentation on the jquery site:
– Attr: http://api.jquery.com/attr/
– Clone: http://api.jquery.com/clone/

OpenSSL::PKey::RSAError Neither PUB key nor PRIV key:: nested asn1 error – Adaptive Payments Gem

Hey everyone,

I’ve been mucking around with PayPal for a while and decided to try out the adaptive_payments gem by Tommy Chheng. Unfortunately I ran into the following error:

OpenSSL::PKey::RSAError

Neither PUB key nor PRIV key:: nested asn1 error

It turns out that I’d simply skipped an important part of the readme file. The api_cert_file in the paypal_adaptive.yaml file should point to a file containing BOTH your paypal_cert_pem.txt and whatever your private key happens to be. This took an embarrassingly long time for me to figure out, so hopefully this will help some of you!

UPDATE
It turns out I still had this wrong, I was using the wrong certs. After sorting out a few more errors that I ran into after the one mentioned above I finally started getting a response from Paypal, unfortunately it was another error message:

Authentication failed. API credentials are incorrect

It turns out I was using the wrong certs. If you’ve run into the same problem you’ll need to go to Profile > Request API Credentials > Option 2 (Request API credentials to create your own API username and password.). Then download the cert and point to this.

UPDATE
Hey everyone, just another update to this. If you happened to be following the railscast on PayPal before attempting to use the gem, you may not get the option to download the certs mentioned above. To get around this, simply remove your existing certificates (Profile > API Access > Option 2 > Remove > Remove). You should now see the ‘Request API Certificate Option’.

Sorry about the confusing post, but there’s a *slight* chance it might be able to help someone else who runs into the same problem.
Cheers

Blocking Duplicate Payment – Paypal

Hey everyone,

Just a quick post on how to block duplicate payments with PayPal. All you have to do is pass an invoice parameter and then select the ‘block multiple payments per invoice ID’ option in PayPal. I’ve attached an extract from PayPal’s documentation below:

1. Login at https://www.paypal.com
2. Click the ‘Profile’ subtab
3. Under ‘Selling Preferences’ click ‘Payment Receiving Preferences’
4. Choose ‘Yes, block multiple payments per invoice ID’ if you wish to utilize this feature while passing the “invoice” variable
5. Scroll to the bottom and click the ‘Save’ button

To pass the invoice number for Website Payments Standard, you will need to add a line of code to your existing button code. You cannot add this code to a button originally created as encrypted. Example below:

<input type=”hidden” name=”invoice” value=”001″>

The documentation is available at the following link:
https://ppmts.custhelp.com/app/answers/detail/a_id/165

Uploadify – Limit to One Upload Only

Hey everyone,

Just a quick post detailing how to limit uploadify to a single file. Simply add the following settings to your uploadify initialisation:

multi: false
queueSizeLimit : 1
uploadLimit : 1


$(document).ready(function() {
     $('#file_upload').uploadify({
        'swf' : 'Html->url('/uploadify/uploadify.swf');?>',
	'uploader' : 'Html->url('/uploadify/uploadify.php');?>',
	'cancelImg' : 'Html->url('/webroot/uploadify/cancel.png');?>',
	'folder' : 'Html->url('/extraz/uploaded_by_all_users');?>',
	'auto' : true,
	'buttonText' : 'Browse',
	'multi' : false,
	'queueSizeLimit' : 1,
	'uploadLimit' : 1,
	'sizeLimit' : 1073741824,
	'debug' : true,
	'multi' : false,	        
	'onUploadProgress' : upload_progress_handler,
	'onUploadStart' : upload_start_handler,
	'onUploadSuccess' : on_upload_success,
	'onUploadError' : on_upload_error
     });
});

Once the upload limit is exceeded the onUploadError event is raised.

Cheers

Setup RVM on Ubuntu – Ruby on Rails

Hey everyone,

I’ve just done a fresh install of RVM using the guide below. There were a few dependencies missing, but other than that it all went pretty smoothly.

Link: http://stjhimy.com/posts/10-five-quick-steps-to-set-up-rvm-with-rails-2-and-rails3

Next time I do an install I’ll try to document the whole thing, but for now that link is probably one of the better/simpler guides I’ve come across. If you have any problems please leave a comment below and I’ll try to get back to you.

UPDATE:

Just another guide I’ve come across that seems to work well, this one is a complete “start to finish” one:
http://rails.vandenabeele.com/blog/2011/11/26/installing-ruby-and-rails-with-rvm-on-ubuntu-11-dot-10/

Heroku Timezones – Ruby on Rails

Hey everyone,

Just a quick post on how to adjust the timezone on Heroku, comes in handy when using the log files.

#Console
$ heroku config:add TZ=Australia/Brisbane

There is a fairly detailed StackOverflow post at the following link if anyone is interested in more info:
http://stackoverflow.com/questions/2719330/why-does-heroku-log-using-the-server-time-rather-than-the-rails-time-zone

The language options can also be found on the following wikipedia page:
http://en.wikipedia.org/wiki/List_of_tz_database_time_zones

Rails Casts #142 Paypal Notifications

Hey all,

I ran into a bit of an issue in Rails Cast #142. I received the following error while testing the IPN:

WARNING: Can't verify CSRF token authenticity
Completed 500 Internal Server Error in 2ms
app/controllers/payment_notifications_controller.rb:11:in `process_ipn_payment'

Simply replace the following line with the alternative below it:

#Payment_Notifications_Controller.rb
protect_from_forgery :except => [:create]

#Payment_Notifications_Controller.rb
skip_before_filter :verify_authenticity_token, :only => [:create]

Cannot Generate Tempfile – Ruby on Rails

Ran into the following problem, still not too sure what caused it but this seems to have fixed it:

Error

cannot generate tempfile `/home/chris/cartsite/tmp/cache/assets/sprockets%2Fd585a06e2ee6203ccb04c8b84150d14d20120804-8682-7q77nb-9'

Just run the following:

$ rake tmp:clear

Let me know if you come across the cause, I’d be interested to know.