resilio-public-link-automator.js

function run(input, parameters) {
    var app = Application.currentApplication()
    app.includeStandardAdditions = true;
    
    for(var x = 0; x < input.length; x += 1) {
        var filePath = input[x].toString()

        if(filePath.length > 0) {
            var escaped = escape(filePath);

            if( (escaped.toLowerCase().indexOf("resilio") > -1) &&
                (escaped.toLowerCase().indexOf("public") > -1) ) {

                var pubUrl = escaped.replace(/^.*Resilio%20Sync\/Public/, "http://grahams.wtf/public")

                app.setTheClipboardTo(pubUrl)
                
                delay(.25);
            }
        }
    }
}

This script more or less works for Shortcuts as well. You want receive files from Quick Actions -> Run JS for Automation with Shortcut Input -> Copy JavaScript Result to clipboard

function run(input, parameters) {
    for(var x = 0; x < input.length; x += 1) {
        var filePath = input[x].toString()

        if(filePath.length > 0) {
            var escaped = escape(filePath);

            if( (escaped.toLowerCase().indexOf("resilio") > -1) &&
                (escaped.toLowerCase().indexOf("public") > -1) ) {

                var pubUrl = escaped.replace(/^.*Resilio%20Sync\/Public/, "http://grahams.wtf/public")
               	return(pubUrl);
            }
        }
    }
}