S1 server side detection method explanation

Question

I found the following method for S1 server side detection on github:

//Determin if this is SF1 app
public static Boolean isSF1(){
    if(!Utils.checkNullOrBlank(ApexPages.currentPage().getParameters().get('sfdcIFrameHost')) ||
        !Utils.checkNullOrBlank(ApexPages.currentPage().getParameters().get('sfdcIFrameOrigin')) ||
        ApexPages.currentPage().getParameters().get('isdtp') == 'p1' ||
        (ApexPages.currentPage().getParameters().get('retURL') != null && ApexPages.currentPage().getParameters().get('retURL').contains('projectone') )
    ){
        return true;
    }else{
        return false;
    }
}

It does the trick and is a very handy piece of code.

However, I can't seem to find any explanation of the parameters it's checking:

1. sfdcIFrameHost

2. sfdcIFrameOrigin

3. isdtp

4. projectone

Does anyone know anything about these parameters?

Answer 1

Hard to give a true explanation as Salesforce hasn't released that so we can only guess.

isdtp appears to be used to define how the page is rendered: www.ca-peterson.com/2011/11/magic-isdtp-param.html

sfdcIFrameOrigin and sfdcIFrameHost seem to be two parameters passed on mobile only (at this time).
sfdcIFrameOrigin is probably used to resolve some cross site scripting issues. sfdcIFrameHost when I inspected it in the desktop version of the one app was set to web whereas from the mobile device it was set to hybrid so I guess it helps the app determine what type of environment it is in.