php simplexml with spreadshirt api - php

Question

I'm trying to use Spreadshirt API to create a product on their platform, but i'm stuck with this weird error:
Fatal error: Uncaught exception 'Exception' with message 'String could not be parsed as XML' in /home/anarchoi/public_html/test.php:102 Stack trace: #0 /home/anarchoi/public_html/test.php(102): SimpleXMLElement->__construct('') #1 {main} thrown in /home/anarchoi/public_html/test.php on line 102
Most of the code is just copied from their wiki so i really don't understand why it doesn't work.
I'm looking for help to understand where the error is coming from and why it is happening.
$productTypeId = "210";
$printTypeId = "17";
$printColorIds = "13,20";
$productTypeAppearanceId = "1";
$productTypePrintAreaId = "4";
$designId = "10438193";
// 1. Get shop data
$shopUrl = "http://api.spreadshirt.com/api/v1/shops/266497";
$ch = curl_init($shopUrl);
curl_setopt($ch, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_1);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HEADER, false);
$result = curl_exec($ch);
// Close the handle
curl_close($ch);
$shop = new SimpleXMLElement($result);
$namespaces = $shop->getNamespaces(true);
// 2. Get product type data
$attributes = $shop->productTypes->attributes($namespaces['xlink']);
$productTypeUrl = $attributes->href . "/" . $productTypeId;
$ch = curl_init($productTypeUrl);
// echo "<br>$productTypeUrl<br>";
curl_setopt($ch, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_1);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HEADER, false);
$result = curl_exec($ch);
// Close the handle
curl_close($ch);
$productType = new SimpleXMLElement($result);
// 3. Get design data
$attributes = $shop->designs->attributes($namespaces['xlink']);
$designUrl = $attributes->href . "/" . $designId;
$ch = curl_init($designUrl);
curl_setopt($ch, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_1);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HEADER, false);
$result = curl_exec($ch);
// Close the handle
curl_close($ch);
$design = new SimpleXMLElement($result);
// 4. Prepare product
// get positioning data for selected product type
$printArea = null;
foreach ($productType->printAreas->printArea as $current) {
if ($current['id'] == $productTypePrintAreaId) {
$printArea = $current;
}
}
$product = new SimpleXMLElement(getFileData("product.xml"));
$product->productType['id'] = $productTypeId;
$product->appearance['id'] = $productTypeAppearanceId;
$configuration = $product->configurations->configuration;
$configuration->printArea['id'] = $productTypePrintAreaId;
$configuration->printType['id'] = $printTypeId;
$configuration->offset->x =
((doubleval($printArea->boundary->size->width) - doubleval($design->size->width)) / 2);
$configuration->offset->y =
((doubleval($printArea->boundary->size->height) - doubleval($design->size->height)) / 4);
$image = $product->configurations->configuration->content->svg->image;
$image['width'] = $design->size->width;
$image['height'] = $design->size->height;
$image['designId'] = $designId;
$image['printColorIds'] = $printColorIds;
// 5. Create product
$attributes = $shop->products->attributes($namespaces['xlink']);
$productsUrl = $attributes->href;
$header = array();
$header[] = createSprdAuthHeader("POST", $productsUrl);
$header[] = "Content-Type: application/xml";
$ch = curl_init("$productsUrl"."?fullData=true");
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_1);
curl_setopt($ch, CURLOPT_HTTPHEADER, $header);
curl_setopt($ch, CURLOPT_POSTFIELDS, $product->asXML());
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HEADER, true);
$result = curl_exec($ch);
// Close the handle
curl_close($ch);
$productUrl = parseHttpHeaders($result, "Location");
$ch = curl_init($productUrl);
curl_setopt($ch, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_1);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HEADER, false);
$result = curl_exec($ch);
// Close the handle
curl_close($ch);
$product = new SimpleXMLElement($result);
$resource = $product->resources->resource[0];
$attributes = $resource->attributes($namespaces['xlink']);
echo '<html><body>';
echo 'Product available at: ' . $productUrl . '</br>';
echo 'Product image is available at: ' . $attributes->href . '</br>';
echo '<img src="' . $attributes->href . '?width=1000"/>';
echo '</body></html>';
function createSprdAuthHeader($method, $url) {
$apiKey = "***";
$secret = "***";
$time = time()*1000;
$data = "$method $url $time";
$sig = sha1("$data $secret");
return "Authorization: SprdAuth apiKey=\"$apiKey\", data=\"$data\", sig=\"$sig\"";
}
function parseHttpHeaders( $header, $headername ) {
$retVal = array();
$fields = explode("\r\n", preg_replace('/\x0D\x0A[\x09\x20]+/', ' ', $header));
foreach( $fields as $field ) {
if( preg_match('/('.$headername.'): (.+)/m', $field, $match) ) {
return $match[2];
}
}
return $retVal;
}
function getFileData($file) {
$fp = fopen($file, "r");
$data = "";
while(!feof($fp)) {
$data .= fgets($fp, 1024);
}
fclose($fp);
return $data;
}
product.xml = https://www.ni-dieu-ni-maitre.com/product.xml

Answer 1

I stumbled upon similar issue when implementing Spreadshirt, looks like their API server is sending (at least some) content gzipped regardless of any Accept-Encoding headers. You can tell that it's your case by var_dumping the string before it's passed to SimpleXMLElement (as suggested by others) – if it's gibberish, it's very possible you have the same issue as I did.
Setting the curl option of CURLOPT_ENCODING to an empty string ('') fixed that for me – it "magically" turned on ungzipping the response (see man page for curl_setopt() for more information).