Script or Action - Make image square

Question

Need to add this to an action, rather than making all images square manually before batching them all.
- All 500+ images are various sizes both portait, landscape and possibly square already.
- They are all cropped tightly around the product with a white background.
So currently: I just use canvas size, anchor to the centre and change the smallest pixel dimension to make it square, so none of the product is cropped.
Any ideas?
I couldn't get JJMack's aspect ratio script to help me.
Automate -> Fit Image will take it to 1000 pixels but still won't be square.
EDIT: Oh my. I just found this, looks like it'll do the job. Will test some more in the morning.
var savedRuler= app.preferences.rulerUnits;
app.preferences.rulerUnits = Units.PIXELS;
var w = app.activeDocument.width;
var h = app.activeDocument.height;
if(w>h) app.activeDocument.resizeCanvas (w, w, AnchorPosition.MIDDLECENTER);
if(w<h) app.activeDocument.resizeCanvas (h, h, AnchorPosition.MIDDLECENTER);
//if w==h already square
app.preferences.rulerUnits = savedRuler;

Answer 1

I have a need for this script as well...is this the entire script?  If not, can you post the complete script?
I just need to increase either the canvas width (as white area for the added width/height) or the canvas height to match the longest side of an image so they they are perfectly square.  No cropping or reduction in image sizes.  These are product images on white background.
Is this the full script?
var startColor = app.backgroundColor; 
if(startColor.rgb.hexValue != 'FFFFFF'){ 
var white = new SolidColor(); 
white.rgb.hexValue = 'FFFFFF'; 
app.backgroundColor = white; 
var savedRuler= app.preferences.rulerUnits;
app.preferences.rulerUnits = Units.PIXELS;
var w = app.activeDocument.width;
var h = app.activeDocument.height;
if(w>h) app.activeDocument.resizeCanvas (w, w, AnchorPosition.MIDDLECENTER);
if(w<h) app.activeDocument.resizeCanvas (h, h, AnchorPosition.MIDDLECENTER);
//if w==h already square
app.preferences.rulerUnits = savedRuler;
if(white != undefined) app.backgroundColor = startColor;