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<?php namespace HashOver;
// Copyright (C) 2010-2018 Jacob Barkdull
// This file is part of HashOver.
//
// HashOver is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as
// published by the Free Software Foundation, either version 3 of the
// License, or (at your option) any later version.
//
// HashOver is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with HashOver. If not, see <http://www.gnu.org/licenses/>.
//
//--------------------
//
// Script Description:
//
// This script reads a given comment file, retrieves the like count,
// increases the count by one, then writes the file. Assuming the
// visitor hasn't already liked the given comment before and the
// visitor isn't the comment's original poster.
// Check if request is for JSONP
if (isset ($_GET['jsonp'])) {
// If so, setup HashOver for JavaScript
require ('javascript-setup.php');
} else {
// If not, setup HashOver for JSON
require ('json-setup.php');
}
// Sets cookie indicating what comment was liked
function set_like (&$hashover, $like_hash, $set, &$likes)
{
$hashover->cookies->set ($like_hash, $set, mktime (0, 0, 0, 11, 26, 3468));
$likes = $likes + 1;
}
// Decreases a like/dislike count
function like_decrease (&$likes)
{
if ($likes > 0) {
$likes = $likes - 1;
}
}
// Likes or dislikes a comment
function liker ($action, $like_hash, &$hashover, &$comment)
{
// Get the comment array key based on given action
$key = ($action === 'like') ? 'likes' : 'dislikes';
$set = ($action === 'like') ? 'liked' : 'disliked';
// Get like cookie
$like_cookie = $hashover->cookies->getValue ($like_hash);
// Check that a like/dislike cookie is not already set
if ($like_cookie === null) {
// If so, set the cookie and increase the like/dislike count
set_like ($hashover, $like_hash, $set, $comment[$key]);
} else {
// If not, we're unliking/un-disliking the comment
$opposite_key = ($action === 'like') ? 'dislikes' : 'likes';
$opposite_set = ($action === 'like') ? 'disliked' : 'liked';
// Check if the user has liked the comment
if ($like_cookie === $set) {
// If so, expire the like cookie
$hashover->cookies->expireCookie ($like_hash);
// And decrease the like count
like_decrease ($comment[$key]);
}
// Check if the user has disliked the comment
if ($like_cookie === $opposite_set) {
// If so, expire the dislike cookie
set_like ($hashover, $like_hash, $set, $comment[$key]);
// And decrease the dislike count
like_decrease ($comment[$opposite_key]);
}
}
}
function get_json_response ($hashover, $key, $action)
{
// JSON data
$data = array ();
// Store references to some long variables
$storageMode =& $hashover->thread->data->storageMode;
$thread = $hashover->setup->threadName;
// Sanitize file path
$file = str_replace ('../', '', $key);
// Read comment
$comment = $hashover->thread->data->read ($file, $thread);
// Return error message if failed to read comment
if ($comment === false) {
return array ('error' => 'Failed to read file: "' . $file . '"');
}
// Check if liker isn't poster via login ID comparision
if ($hashover->login->userIsLoggedIn and !empty ($comment['login_id'])) {
if ($hashover->cookies->getValue ('login') === $comment['login_id']) {
// Return error message if liker posted the comment
return array ('message' => 'Practice altruism!');
}
}
// Name of the cookie used to indicate liked comments
$like_hash = md5 ($hashover->setup->domain . $thread . '/' . $key);
// Action: like or dislike
$action = ($action !== 'dislike') ? 'like' : 'dislike';
// Like or dislike the comment
liker ($action, $like_hash, $hashover, $comment);
// Attempt to save file with updated like count
if ($hashover->thread->data->save ($file, $comment, true, $thread)) {
// If successful, add number of likes to JSON
if (isset ($comment['likes'])) {
$data['likes'] = $comment['likes'];
}
// And add dislikes to JSON as well
if (isset ($comment['dislikes'])) {
$data['dislikes'] = $comment['dislikes'];
}
} else {
// If failed, add error message to JSON
$data['error'] = 'Failed to save comment file!';
}
return $data;
}
try {
// Instanciate HashOver class
$hashover = new \HashOver ('json');
// Get required POST/GET data
$url = $hashover->setup->getRequest ('url', null);
$key = $hashover->setup->getRequest ('comment', null);
$action = $hashover->setup->getRequest ('action', null);
// Return error if we're missing necessary post data
if (($url and $key and $action) === null) {
return array ('error' => 'No action.');
}
// Continue HashOver setup
$hashover->setup->setPageURL ($url);
$hashover->initiate ();
// Display JSON response
$data = get_json_response ($hashover, $key, $action);
// Return JSON or JSONP function call
echo $hashover->misc->jsonData ($data);
} catch (\Exception $error) {
$misc = new Misc ('json');
$message = $error->getMessage ();
$misc->displayError ($message);
}
|
