dir/mod/uexport.php

<?php

function uexport_init(&$a){
	if(! local_user())
		killme();
        
	$tabs = array(
		array(
			'label'	=> t('Account settings'),
			'url' 	=> $a->get_baseurl(true).'/settings',
			'selected'	=> '',
		),	
		array(
			'label'	=> t('Display settings'),
			'url' 	=> $a->get_baseurl(true).'/settings/display',
			'selected'	=>'',
		),	
		
		array(
			'label'	=> t('Connector settings'),
			'url' 	=> $a->get_baseurl(true).'/settings/connectors',
			'selected'	=> '',
		),
		array(
			'label'	=> t('Plugin settings'),
			'url' 	=> $a->get_baseurl(true).'/settings/addon',
			'selected'	=> '',
		),
		array(
			'label' => t('Connected apps'),
			'url' => $a->get_baseurl(true) . '/settings/oauth',
			'selected' => '',
		),
		array(
			'label' => t('Export personal data'),
			'url' => $a->get_baseurl(true) . '/uexport',
			'selected' => 'active'
		),
		array(
			'label' => t('Remove account'),
			'url' => $a->get_baseurl(true) . '/removeme',
			'selected' => ''
		)
	);
	
	$tabtpl = get_markup_template("generic_links_widget.tpl");
	$a->page['aside'] = replace_macros($tabtpl, array(
		'$title' => t('Settings'),
		'$class' => 'settings-widget',
		'$items' => $tabs,
	));
}

function uexport_content(&$a){
    
    if ($a->argc > 1) {
        header("Content-type: application/json");
        header('Content-Disposition: attachment; filename="'.$a->user['nickname'].'.'.$a->argv[1].'"');
        switch($a->argv[1]) {
            case "backup": uexport_all($a); killme(); break;
            case "account": uexport_account($a); killme(); break;
            default:
                killme();
        }
    }

    /**
      * options shown on "Export personal data" page
      * list of array( 'link url', 'link text', 'help text' )
      */
    $options = array(
            array('/uexport/account',t('Export account'),t('Export your account info and contacts. Use this to make a backup of your account and/or to move it to another server.')),
            array('/uexport/backup',t('Export all'),t('Export your accout info, contacts and all your items as json. Could be a very big file, and could take a lot of time. Use this to make a full backup of your account (photos are not exported)')),
    );
    call_hooks('uexport_options', $options);
        
    $tpl = get_markup_template("uexport.tpl");
    return replace_macros($tpl, array(
        '$baseurl' => $a->get_baseurl(),
        '$title' => t('Export personal data'),
        '$options' => $options
    ));
    
    
}

function _uexport_multirow($query) {
	$result = array();
	$r = q($query);
//	if(count($r)) {
	if ($r){
		foreach($r as $rr){
            $p = array();
			foreach($rr as $k => $v)
				$p[$k] = $v;
            $result[] = $p;
        }
	}
    return $result;
}

function _uexport_row($query) {
	$result = array();
	$r = q($query);
	if ($r) {
		foreach($r as $rr)
			foreach($rr as $k => $v)
				$result[$k] = $v;

	}
    return $result;
}


function uexport_account($a){

	$user = _uexport_row(
        sprintf( "SELECT * FROM `user` WHERE `uid` = %d LIMIT 1", intval(local_user()) )
	);
    
	$contact = _uexport_multirow(
        sprintf( "SELECT * FROM `contact` WHERE `uid` = %d ",intval(local_user()) )
	);


	$profile =_uexport_multirow(
        sprintf( "SELECT * FROM `profile` WHERE `uid` = %d ", intval(local_user()) )
	);

    $photo = _uexport_multirow(
        sprintf( "SELECT * FROM `photo` WHERE uid = %d AND profile = 1", intval(local_user()) )
    );
    foreach ($photo as &$p) $p['data'] = bin2hex($p['data']);

    $pconfig = _uexport_multirow(
        sprintf( "SELECT * FROM `pconfig` WHERE uid = %d",intval(local_user()) )
    );

    $group = _uexport_multirow(
        sprintf( "SELECT * FROM `group` WHERE uid = %d",intval(local_user()) )
    );
    
    $group_member = _uexport_multirow(
        sprintf( "SELECT * FROM `group_member` WHERE uid = %d",intval(local_user()) )
    );

	$output = array(
        'version' => FRIENDICA_VERSION,
        'schema' => DB_UPDATE_VERSION,
        'baseurl' => $a->get_baseurl(),
        'user' => $user, 
        'contact' => $contact, 
        'profile' => $profile, 
        'photo' => $photo,
        'pconfig' => $pconfig,
        'group' => $group,
        'group_member' => $group_member,
    );

    //echo "<pre>"; var_dump(json_encode($output)); killme();
	echo json_encode($output);

}

/**
 * echoes account data and items as separated json, one per line
 */
function uexport_all(&$a) {
    
    uexport_account($a);
	echo "\n";

	$r = q("SELECT count(*) as `total` FROM `item` WHERE `uid` = %d ",
		intval(local_user())
	);
	if(count($r))
		$total = $r[0]['total'];

	// chunk the output to avoid exhausting memory

	for($x = 0; $x < $total; $x += 500) {
		$item = array();
		$r = q("SELECT * FROM `item` WHERE `uid` = %d LIMIT %d, %d",
			intval(local_user()),
			intval($x),
			intval(500)
		);
		/*if(count($r)) {
			foreach($r as $rr)
				foreach($rr as $k => $v)
					$item[][$k] = $v;
		}*/

		$output = array('item' => $r);
		echo json_encode($output)."\n";
	}

}