PrivateBin/lib/Model/Comment.php

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<?php
/**
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* PrivateBin
*
* a zero-knowledge paste bin
*
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* @link https://github.com/PrivateBin/PrivateBin
* @copyright 2012 Sébastien SAUVAGE (sebsauvage.net)
* @license https://www.opensource.org/licenses/zlib-license.php The zlib/libpng License
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* @version 1.2
*/
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namespace PrivateBin\Model;
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use Exception;
use Identicon\Identicon;
use PrivateBin\Persistence\TrafficLimiter;
use PrivateBin\Sjcl;
use PrivateBin\Vizhash16x16;
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/**
* Comment
*
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* Model of a PrivateBin comment.
*/
class Comment extends AbstractModel
{
/**
* Instance's parent.
*
* @access private
* @var Paste
*/
private $_paste;
/**
* Get comment data.
*
* @access public
* @throws Exception
* @return stdClass
*/
public function get()
{
// @todo add support to read specific comment
$comments = $this->_store->readComments($this->getPaste()->getId());
foreach ($comments as $comment) {
if (
$comment->parentid == $this->getParentId() &&
$comment->id == $this->getId()
) {
$this->_data = $comment;
break;
}
}
return $this->_data;
}
/**
* Store the comment's data.
*
* @access public
* @throws Exception
*/
public function store()
{
// Make sure paste exists.
$pasteid = $this->getPaste()->getId();
if (!$this->getPaste()->exists()) {
throw new Exception('Invalid data.', 67);
}
// Make sure the discussion is opened in this paste and in configuration.
if (!$this->getPaste()->isOpendiscussion() || !$this->_conf->getKey('discussion')) {
throw new Exception('Invalid data.', 68);
}
// Check for improbable collision.
if ($this->exists()) {
throw new Exception('You are unlucky. Try again.', 69);
}
$this->_data->meta->postdate = time();
// store comment
if (
$this->_store->createComment(
$pasteid,
$this->getParentId(),
$this->getId(),
json_decode(json_encode($this->_data), true)
) === false
) {
throw new Exception('Error saving comment. Sorry.', 70);
}
}
/**
* Delete the comment.
*
* @access public
* @throws Exception
*/
public function delete()
{
throw new Exception('To delete a comment, delete its parent paste', 64);
}
/**
* Test if comment exists in store.
*
* @access public
* @return bool
*/
public function exists()
{
return $this->_store->existsComment(
$this->getPaste()->getId(),
$this->getParentId(),
$this->getId()
);
}
/**
* Set paste.
*
* @access public
* @param Paste $paste
* @throws Exception
*/
public function setPaste(Paste $paste)
{
$this->_paste = $paste;
$this->_data->meta->pasteid = $paste->getId();
}
/**
* Get paste.
*
* @access public
* @return Paste
*/
public function getPaste()
{
return $this->_paste;
}
/**
* Set parent ID.
*
* @access public
* @param string $id
* @throws Exception
*/
public function setParentId($id)
{
if (!self::isValidId($id)) {
throw new Exception('Invalid paste ID.', 65);
}
$this->_data->meta->parentid = $id;
}
/**
* Get parent ID.
*
* @access public
* @return string
*/
public function getParentId()
{
if (!property_exists($this->_data->meta, 'parentid')) {
$this->_data->meta->parentid = '';
}
return $this->_data->meta->parentid;
}
/**
* Set nickname.
*
* @access public
* @param string $nickname
* @throws Exception
*/
public function setNickname($nickname)
{
if (!Sjcl::isValid($nickname)) {
throw new Exception('Invalid data.', 66);
}
$this->_data->meta->nickname = $nickname;
// If a nickname is provided, we generate an icon based on a SHA512 HMAC
// of the users IP. (We assume that if the user did not enter a nickname,
// the user wants to be anonymous and we will not generate an icon.)
$icon = $this->_conf->getKey('icon');
if ($icon != 'none') {
$pngdata = '';
$hmac = TrafficLimiter::getHash();
if ($icon == 'identicon') {
$identicon = new Identicon();
$pngdata = $identicon->getImageDataUri($hmac, 16);
} elseif ($icon == 'vizhash') {
$vh = new Vizhash16x16();
$pngdata = 'data:image/png;base64,' . base64_encode(
$vh->generate($hmac)
);
}
if ($pngdata != '') {
$this->_data->meta->vizhash = $pngdata;
}
}
// Once the icon is generated, we do not keep the IP address hash.
}
}