Which URL made the request to my Google Apps Script? - paypal

Question

How can I determine the source URL of a GET or POST request sent to a Google Apps Script web application?
I am making a (PayPal IPN) listener script and would like to be able to distinguish weather the request came from a the test environment (sandbox) or from the live environment.
The origin of the request to the listener determines the response from the script. The listener has to send a response back to PayPal and depending on which environment the request came from, the response needs to go back either to the sandbox server or to the live server.
I am hoping to distinguish between requests from sandbox.paypal.com or www.paypal.com, in my Google Apps Script.
To work around this requirement, I have set it manually for now:
if (PPRunMode == 'test') {//in testmode send response to sandbox site
PPUrlBase = "https://www.sandbox.paypal.com/cgi-bin/webscr";
}
else {//url for live website
PPUrlBase = "https://www.paypal.com/cgi-bin/webscr";
}
But was wondering if this can be determined automatically.

Answer 1

Unfortunately, no request-source information is provided to your Google Apps Script web application, so there is no direct way to determine where a request came from.
You do have the ability to provide parameters to your web app, though, so you could have the code in the sandboxed environment use that to indicate a test condition.
For example, this URL could be used by the sandboxed code for a GET request:
https://script.google.com/macros/s/---SCRIPT-ID---/exec?test=true
^^^^^^^^^^
In the doGet(e) function, you would handle the parameter like this:
function doGet(e) {
if (e.parameter.test) { //in testmode send response to sandbox site
PPUrlBase = "https://www.sandbox.paypal.com/cgi-bin/webscr";
}
else {//url for live website
PPUrlBase = "https://www.paypal.com/cgi-bin/webscr";
}
...
}
For a POST request, the solution is similar. See URL parameters in the Web Apps and Google Sites Gadgets guide for details.

Answer 2

If you publish your Google App Script you get two urls :
https://script.google.com/macros/s/AKfycbxsCNyssA0dzMMmsNip3DW66hiJ62ks_F1yYUn0SDu073S2dOw/exec
https://script.google.com/macros/s/AKfycbxzpvZ9e9_vzs3d6Q0ky_RHLoYDruCl-6Xm8D6YmI4/dev
You can notice the difference, not sure if that is what you are pointing to