kdavidjames/strip.php

## strip.php
<?php

// Check that we have a file
if((!empty($_FILES["file"])) && ($_FILES['file']['error'] == 0))
{
	// Set some variables
	$inputFile = $_FILES['file']['tmp_name'];
	$outputFile = 'cleaned_'.$_FILES['file']['name'];
	$nodesToStrip = $_POST['elements']; // array of child nodes to strip (hr|cad)

	// Strip the data! You don't want your competitors knowing how much POWAH you're capable of
	// or how great (or tired) your superhuman blood pumping device is. Keep it to yourself; Secrecy is KEY!
	$strippedXML = cleanDOM($inputFile, $outputFile, $nodesToStrip);

	// Serve the stripped XML data to the user
	if($strippedXML){
		header('Content-type: text/xml');
		header('Content-Disposition: attachment; filename="'.$outputFile.'"');

		echo $strippedXML;
		exit();
	}
}

/**
 * cleanDOM load a GPX/XML file and remove specified child nodes.
 *
 * @param string $inputFile specify input file with XML data to be cleaned.
 * @param string $outputFile specify the output file name (don't forget the file extension!)
 * @param array  $nodesToStrip specify which child nodes to remove from the XML data.
 * @param bool   $returnDOM determines what is returned once the function has been run. TRUE will return the stripped DOM, FALSE will save the file to disk.
 * @param string $nameSpace specify the XML namespace to use. Default for Garmin Track Point Extension: http://www.garmin.com/xmlschemas/TrackPointExtension/v1
 *
 * @todo strip power data!
 */
function cleanDOM($inputFile, $outputFile, $nodesToStrip, $returnDOM = true, $nameSpace = 'http://www.garmin.com/xmlschemas/TrackPointExtension/v1')
{
	if(!is_array($nodesToStrip)){
		return false; // We need an array, we don't have one
	}

	$dom = new DOMDocument;
	$dom->preserveWhiteSpace = false;
	$dom->formatOutput = true;

	$dom->load($inputFile);

	foreach($nodesToStrip as $nodeToStrip)
	{
		$domNodeList = $dom->getElementsByTagNameNS($nameSpace, $nodeToStrip // Find the node

		// Compile an array of nodes to remove
		$domElemsToRemove = array();
		foreach($domNodeList as $domElement)
		{
			// echo "{$elementTostrip}: {$domElement->nodeValue} <br />\n"; // Crazy nested XML can be hard. Show me da node, yo!
			$domElemsToRemove[] = $domElement;
		}

		// Remove the node(s)!
		foreach($domElemsToRemove as $domElement)
		{
		  $domElement->parentNode->removeChild($domElement); // Buh-Bye!
		}
	}

	return ($returnDOM === false) ? $dom->save($outputFile) : $dom->saveXML(); // Save file to disk or return DOM
}
?>
<html>
<head>
	<title>Strip Ride Metrics</title>
</head>
<body>
	<form method="POST" action="<?php echo $_SERVER['PHP_SELF']; ?>" enctype="multipart/form-data">
		<p><input type="file" name="file" /></p>
		<p>
			Strip your ride of the following metrics:
			<ul>
				<li><label><input type="checkbox" name="elements[]" value="hr">Heart Rate</label></li>
				<li><label><input type="checkbox" name="elements[]" value="cad">Cadence</label></li>
				<li><label><input type="checkbox" name="elements[]" value="watts" disabled="disabled">Power</label></li>
			</ul>
		</p>
		<p><input type="submit" value="Strip!" /></p>
	</form>
</body>
</html>
	<?php

	// Check that we have a file
	if((!empty($_FILES["file"])) && ($_FILES['file']['error'] == 0))
	{
	// Set some variables
	$inputFile = $_FILES['file']['tmp_name'];
	$outputFile = 'cleaned_'.$_FILES['file']['name'];
	$nodesToStrip = $_POST['elements']; // array of child nodes to strip (hr\|cad)

	// Strip the data! You don't want your competitors knowing how much POWAH you're capable of
	// or how great (or tired) your superhuman blood pumping device is. Keep it to yourself; Secrecy is KEY!
	$strippedXML = cleanDOM($inputFile, $outputFile, $nodesToStrip);

	// Serve the stripped XML data to the user
	if($strippedXML){
	header('Content-type: text/xml');
	header('Content-Disposition: attachment; filename="'.$outputFile.'"');

	echo $strippedXML;
	exit();
	}
	}

	/**
	* cleanDOM load a GPX/XML file and remove specified child nodes.
	*
	* @param string $inputFile specify input file with XML data to be cleaned.
	* @param string $outputFile specify the output file name (don't forget the file extension!)
	* @param array $nodesToStrip specify which child nodes to remove from the XML data.
	* @param bool $returnDOM determines what is returned once the function has been run. TRUE will return the stripped DOM, FALSE will save the file to disk.
	* @param string $nameSpace specify the XML namespace to use. Default for Garmin Track Point Extension: http://www.garmin.com/xmlschemas/TrackPointExtension/v1
	*
	* @todo strip power data!
	*/
	function cleanDOM($inputFile, $outputFile, $nodesToStrip, $returnDOM = true, $nameSpace = 'http://www.garmin.com/xmlschemas/TrackPointExtension/v1')
	{
	if(!is_array($nodesToStrip)){
	return false; // We need an array, we don't have one
	}

	$dom = new DOMDocument;
	$dom->preserveWhiteSpace = false;
	$dom->formatOutput = true;

	$dom->load($inputFile);

	foreach($nodesToStrip as $nodeToStrip)
	{
	$domNodeList = $dom->getElementsByTagNameNS($nameSpace, $nodeToStrip // Find the node

	// Compile an array of nodes to remove
	$domElemsToRemove = array();
	foreach($domNodeList as $domElement)
	{
	// echo "{$elementTostrip}: {$domElement->nodeValue} <br />\n"; // Crazy nested XML can be hard. Show me da node, yo!
	$domElemsToRemove[] = $domElement;
	}

	// Remove the node(s)!
	foreach($domElemsToRemove as $domElement)
	{
	$domElement->parentNode->removeChild($domElement); // Buh-Bye!
	}
	}

	return ($returnDOM === false) ? $dom->save($outputFile) : $dom->saveXML(); // Save file to disk or return DOM
	}
	?>
	<html>
	<head>
	<title>Strip Ride Metrics</title>
	</head>
	<body>
	<form method="POST" action="<?php echo $_SERVER['PHP_SELF']; ?>" enctype="multipart/form-data">
	<p><input type="file" name="file" /></p>
	<p>
	Strip your ride of the following metrics:
	<ul>
	<li><label><input type="checkbox" name="elements[]" value="hr">Heart Rate</label></li>
	<li><label><input type="checkbox" name="elements[]" value="cad">Cadence</label></li>
	<li><label><input type="checkbox" name="elements[]" value="watts" disabled="disabled">Power</label></li>
	</ul>
	</p>
	<p><input type="submit" value="Strip!" /></p>
	</form>
	</body>
	</html>