Hi olaf, As explained in the Nuxeo Automation Commands doc, the Blob.Get operation need documents as input and accept an XPath to a property. The documents input are explained in the Nuxeo Command Endpoint doc:

“doc:/default-domain/workspaces/myworkspace” or “doc:96bfb9cb-a13d-48a2-9bbd-9341fcf24801”

“docs:/default-domain/workspaces/myworkspace, 96bfb9cb-a13d-48a2-9bbd-9341fcf24801”

Although your XPath is correct with files:files/1/file, what you can find with the JSON/XML export of your main document.

Note that the current version of the PHP Automation Client creates as tempstream file when using the Blob.Get operation (a rewrite of the client is under way), you can find an example in the sample B5 in the sources of the client.

With the previous data, you should be able to make a running code as the following :

function GetBlob($path = '/default-domain/workspaces/Default Workspace/Some note') {
    $client = new \Nuxeo\Automation\Client\NuxeoPhpAutomationClient('http://nuxeo:8080/nuxeo/site/automation');
    $session = $client->getSession('Administrator', 'Administrator');
    $answer = $session->newRequest("Blob.Get")->set('input', 'doc:' . $path)->set('params', 'xpath', 'files:files/0/file')->sendRequest();
    if (!isset($answer) OR $answer == false)
        echo '$answer is not set';
    else {
        header('Content-Description: File Transfer');
        header('Content-Type: application/octet-stream');
        header('Content-Disposition: attachment; filename=image.png');
        readfile('tempstream');
    }
}