iOS/Android Biometric Auth

xplatform_bio_auth.js

/*
The Android UI is provided via my Ti.Widget: ti.androidfingerprintalertdialog
https://github.com/adamtarmstrong/ti.androidfingerprintalertdialog
referenced in the code below as:    $.androidFingerprint
*/

function promptForTouchAuth(){		                      "use strict";
      if (OS_IOS) {
		$.emailAddress.blur();		                    //hide keyboard before prompting for biometrics
		TiTouchId.authenticate({
            		reason: 'Use your fingerprint for quick and secure access',
			callback: function(e) {		"use strict";
				if (!e.success) {
					switch(e.code) {
						case TiTouchId.ERROR_AUTHENTICATION_FAILED: 
							clearpswd(); 
							Alloy.Globals.Notifier.show({
							message: 'Too many attempts.  Please re-enter password.',
							style: 'warn',
							duration: 5000,
							onClick: function(){ /* */ }
							});
							break;
						case TiTouchId.ERROR_USER_CANCEL: touchIDIconEnabled(true); break;				                    //user cancelled
						case TiTouchId.ERROR_USER_FALLBACK: break;				                                            //pressed "enter password"
						case TiTouchId.ERROR_SYSTEM_CANCEL: alert('Touch not recognized'); clearpswd(); break;				//system cancelled
						case TiTouchId.ERROR_PASSCODE_NOT_SET: alert('You must first set a passcode before you can use touch authentication'); clearpswd(); break;
						case TiTouchId.ERROR_TOUCH_ID_NOT_AVAILABLE: alert('Your device does not support touch authentication'); clearpswd(); break;
						case TiTouchId.ERROR_TOUCH_ID_NOT_ENROLLED: alert('You must enroll at least one finger before you can use touch authentication'); clearpswd(); break;
						default: break;
					}
				} else {
					setTimeout(function() {		"use strict";
						authenticate();
					}, 0);
				}
			}
		});
	} else if (OS_ANDROID) {
		TiTouchId.authenticate({
			reason: 'Use your fingerprint for quick and secure access',
			callback: function(e) {		"use strict";
				if (!e.success) {
					if (e.error == "Unable to recognize fingerprint"){
						$.androidFingerprint.failure();
					} else if (e.error == "Fingerprint operation canceled.") {
						touchIDIconEnabled(true);
					} else {	            //presumeably too many failures - e.error="Too many attempts. Try again later."
						$.androidFingerprint.hide();
						clearpswd();
						Alloy.Globals.Notifier.show({
						message: 'Too many attempts.  Please re-enter password.',
						style: 'warn',
						duration: 5000,
						onClick: function(){ /* */ }
						});
					}
				} else {
					$.androidFingerprint.success();
					setTimeout(function() {
						authenticate();
					}, 0);
				}
			}
		});
		//present user with Android Specific AlertDialog UI Widget
		$.androidFingerprint.show(usepasswordAndroidTouchID,cancelAndroidTouchID);
	}
}