Create magento package based on simple json object

package.json

{
    "file_name": "Speroteck_Tabmenu",
    "name": "Speroteck_Tabmenu",
    "channel": "community",
    "version_ids": ["2"],
    "summary": "sdfsdfds",
    "description": "dsfsdfdsfdsf",
    "license": "OSC v3.0",
    "license_uri": "",
    "version": "0.1.1",
    "stability": "devel",
    "notes": "sdfdsfsdf",
    "authors": {
        "name": ["Volodymyr Dubyna"],
        "user": ["vdubyna"],
        "email": ["vovikha@gmail.com"]
    },
    "depends_php_min": "5.3.2",
    "depends_php_max": "5.4.0",
    "depends": {
        "package": {
            "name": [""],
            "channel": [""],
            "min": [""],
            "max": [""],
            "files": ["         "]
        },
        "extension": {
            "name": ["Core"],
            "min": [""],
            "max": [""]
        }
    },
    "contents": {
        "target": [
            "magelocal",
            "magelocal",
            "mageetc"
        ],
        "path": [
            "",
            "Speroteck\/Crawler",
            "modules\/Speroteck_Crawler.xml"
        ],
        "type": [
            "file",
            "dir",
            "file"
        ],
        "include": ["", "", ""],
        "ignore": ["", "", ""]
    }
}

package.php

<?php

require 'app/Mage.php';

if (!Mage::isInstalled()) {
    echo "Application is not installed yet, please complete install wizard first.";
    exit;
}

Mage::app('admin')->setUseSessionInUrl(false);
Mage::register('isSecureArea', 1);
Mage::app()->setCurrentStore(Mage_Core_Model_App::ADMIN_STORE_ID);

umask(0);

try {

    $p = Zend_Json::decode(file_get_contents('package.json'));

    $ext = Mage::getModel('connect/extension');
    /** @var $ext Mage_Connect_Model_Extension */
    $ext->setData($p);
    $ext->createPackage();
    echo "Package was successfully generated";
} catch (Exception $e) {
    Mage::printException($e);
}