640 lines
22 KiB
PHP
640 lines
22 KiB
PHP
<?php
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/**
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* Name: Image Comments
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* Author: Shish <webmaster@shishnet.org>
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* Link: http://code.shishnet.org/shimmie2/
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* License: GPLv2
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* Description: Allow users to make comments on images
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* Documentation:
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* Formatting is done with the standard formatting API (normally BBCode)
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*/
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require_once "vendor/ifixit/php-akismet/akismet.class.php";
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class CommentPostingEvent extends Event
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{
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/** @var int */
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public $image_id;
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/** @var \User */
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public $user;
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/** @var string */
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public $comment;
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public function __construct(int $image_id, User $user, string $comment)
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{
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$this->image_id = $image_id;
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$this->user = $user;
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$this->comment = $comment;
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}
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}
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/**
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* A comment is being deleted. Maybe used by spam
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* detectors to get a feel for what should be deleted
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* and what should be kept?
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*/
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class CommentDeletionEvent extends Event
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{
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/** @var int */
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public $comment_id;
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public function __construct(int $comment_id)
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{
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$this->comment_id = $comment_id;
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}
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}
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class CommentPostingException extends SCoreException
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{
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}
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class Comment
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{
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public $owner;
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public $owner_id;
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public $owner_name;
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public $owner_email;
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public $owner_class;
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public $comment;
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public $comment_id;
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public $image_id;
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public $poster_ip;
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public $posted;
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public function __construct($row)
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{
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$this->owner = null;
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$this->owner_id = $row['user_id'];
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$this->owner_name = $row['user_name'];
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$this->owner_email = $row['user_email']; // deprecated
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$this->owner_class = $row['user_class'];
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$this->comment = $row['comment'];
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$this->comment_id = $row['comment_id'];
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$this->image_id = $row['image_id'];
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$this->poster_ip = $row['poster_ip'];
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$this->posted = $row['posted'];
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}
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public static function count_comments_by_user(User $user): int
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{
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global $database;
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return $database->get_one("
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SELECT COUNT(*) AS count
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FROM comments
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WHERE owner_id=:owner_id
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", ["owner_id"=>$user->id]);
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}
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public function get_owner(): User
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{
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if (empty($this->owner)) {
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$this->owner = User::by_id($this->owner_id);
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}
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return $this->owner;
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}
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}
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class CommentList extends Extension
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{
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/** @var CommentListTheme $theme */
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public $theme;
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public function onInitExt(InitExtEvent $event)
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{
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global $config, $database;
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$config->set_default_int('comment_window', 5);
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$config->set_default_int('comment_limit', 10);
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$config->set_default_int('comment_list_count', 10);
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$config->set_default_int('comment_count', 5);
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$config->set_default_bool('comment_captcha', false);
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if ($config->get_int("ext_comments_version") < 3) {
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// shortcut to latest
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if ($config->get_int("ext_comments_version") < 1) {
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$database->create_table("comments", "
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id SCORE_AIPK,
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image_id INTEGER NOT NULL,
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owner_id INTEGER NOT NULL,
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owner_ip SCORE_INET NOT NULL,
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posted SCORE_DATETIME DEFAULT NULL,
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comment TEXT NOT NULL,
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FOREIGN KEY (image_id) REFERENCES images(id) ON DELETE CASCADE,
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FOREIGN KEY (owner_id) REFERENCES users(id) ON DELETE RESTRICT
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");
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$database->execute("CREATE INDEX comments_image_id_idx ON comments(image_id)", []);
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$database->execute("CREATE INDEX comments_owner_id_idx ON comments(owner_id)", []);
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$database->execute("CREATE INDEX comments_posted_idx ON comments(posted)", []);
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$config->set_int("ext_comments_version", 3);
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}
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// the whole history
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if ($config->get_int("ext_comments_version") < 1) {
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$database->create_table("comments", "
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id SCORE_AIPK,
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image_id INTEGER NOT NULL,
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owner_id INTEGER NOT NULL,
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owner_ip CHAR(16) NOT NULL,
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posted SCORE_DATETIME DEFAULT NULL,
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comment TEXT NOT NULL
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");
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$database->execute("CREATE INDEX comments_image_id_idx ON comments(image_id)", []);
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$config->set_int("ext_comments_version", 1);
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}
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if ($config->get_int("ext_comments_version") == 1) {
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$database->Execute("CREATE INDEX comments_owner_ip ON comments(owner_ip)");
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$database->Execute("CREATE INDEX comments_posted ON comments(posted)");
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$config->set_int("ext_comments_version", 2);
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}
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if ($config->get_int("ext_comments_version") == 2) {
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$config->set_int("ext_comments_version", 3);
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$database->Execute("ALTER TABLE comments ADD FOREIGN KEY (image_id) REFERENCES images(id) ON DELETE CASCADE");
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$database->Execute("ALTER TABLE comments ADD FOREIGN KEY (owner_id) REFERENCES users(id) ON DELETE RESTRICT");
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}
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// FIXME: add foreign keys, bump to v3
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}
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}
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public function onPageRequest(PageRequestEvent $event)
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{
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if ($event->page_matches("comment")) {
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switch ($event->get_arg(0)) {
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case "add": $this->onPageRequest_add(); break;
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case "delete": $this->onPageRequest_delete($event); break;
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case "bulk_delete": $this->onPageRequest_bulk_delete(); break;
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case "list": $this->onPageRequest_list($event); break;
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case "beta-search": $this->onPageRequest_beta_search($event); break;
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}
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}
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}
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private function onPageRequest_add()
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{
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global $user, $page;
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if (isset($_POST['image_id']) && isset($_POST['comment'])) {
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try {
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$i_iid = int_escape($_POST['image_id']);
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$cpe = new CommentPostingEvent($_POST['image_id'], $user, $_POST['comment']);
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send_event($cpe);
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$page->set_mode("redirect");
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$page->set_redirect(make_link("post/view/$i_iid#comment_on_$i_iid"));
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} catch (CommentPostingException $ex) {
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$this->theme->display_error(403, "Comment Blocked", $ex->getMessage());
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}
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}
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}
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private function onPageRequest_delete(PageRequestEvent $event)
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{
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global $user, $page;
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if ($user->can("delete_comment")) {
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// FIXME: post, not args
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if ($event->count_args() === 3) {
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send_event(new CommentDeletionEvent($event->get_arg(1)));
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flash_message("Deleted comment");
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$page->set_mode("redirect");
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if (!empty($_SERVER['HTTP_REFERER'])) {
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$page->set_redirect($_SERVER['HTTP_REFERER']);
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} else {
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$page->set_redirect(make_link("post/view/" . $event->get_arg(2)));
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}
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}
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} else {
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$this->theme->display_permission_denied();
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}
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}
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private function onPageRequest_bulk_delete()
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{
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global $user, $database, $page;
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if ($user->can("delete_comment") && !empty($_POST["ip"])) {
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$ip = $_POST['ip'];
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$comment_ids = $database->get_col("
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SELECT id
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FROM comments
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WHERE owner_ip=:ip
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", ["ip" => $ip]);
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$num = count($comment_ids);
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log_warning("comment", "Deleting $num comments from $ip");
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foreach ($comment_ids as $cid) {
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send_event(new CommentDeletionEvent($cid));
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}
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flash_message("Deleted $num comments");
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$page->set_mode("redirect");
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$page->set_redirect(make_link("admin"));
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} else {
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$this->theme->display_permission_denied();
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}
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}
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private function onPageRequest_list(PageRequestEvent $event)
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{
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$page_num = int_escape($event->get_arg(1));
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$this->build_page($page_num);
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}
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private function onPageRequest_beta_search(PageRequestEvent $event)
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{
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$search = $event->get_arg(1);
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$page_num = int_escape($event->get_arg(2));
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$duser = User::by_name($search);
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$i_comment_count = Comment::count_comments_by_user($duser);
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$com_per_page = 50;
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$total_pages = ceil($i_comment_count / $com_per_page);
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$page_num = clamp($page_num, 1, $total_pages);
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$comments = $this->get_user_comments($duser->id, $com_per_page, ($page_num - 1) * $com_per_page);
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$this->theme->display_all_user_comments($comments, $page_num, $total_pages, $duser);
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}
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public function onAdminBuilding(AdminBuildingEvent $event)
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{
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$this->theme->display_admin_block();
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}
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public function onPostListBuilding(PostListBuildingEvent $event)
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{
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global $config, $database;
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$cc = $config->get_int("comment_count");
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if ($cc > 0) {
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$recent = $database->cache->get("recent_comments");
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if (empty($recent)) {
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$recent = $this->get_recent_comments($cc);
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$database->cache->set("recent_comments", $recent, 60);
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}
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if (count($recent) > 0) {
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$this->theme->display_recent_comments($recent);
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}
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}
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}
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public function onUserPageBuilding(UserPageBuildingEvent $event)
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{
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$i_days_old = ((time() - strtotime($event->display_user->join_date)) / 86400) + 1;
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$i_comment_count = Comment::count_comments_by_user($event->display_user);
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$h_comment_rate = sprintf("%.1f", ($i_comment_count / $i_days_old));
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$event->add_stats("Comments made: $i_comment_count, $h_comment_rate per day");
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$recent = $this->get_user_comments($event->display_user->id, 10);
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$this->theme->display_recent_user_comments($recent, $event->display_user);
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}
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public function onDisplayingImage(DisplayingImageEvent $event)
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{
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global $user;
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$this->theme->display_image_comments(
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$event->image,
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$this->get_comments($event->image->id),
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$user->can("create_comment")
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);
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}
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// TODO: split akismet into a separate class, which can veto the event
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public function onCommentPosting(CommentPostingEvent $event)
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{
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$this->add_comment_wrapper($event->image_id, $event->user, $event->comment);
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}
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public function onCommentDeletion(CommentDeletionEvent $event)
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{
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global $database;
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$database->Execute("
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DELETE FROM comments
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WHERE id=:comment_id
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", ["comment_id"=>$event->comment_id]);
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log_info("comment", "Deleting Comment #{$event->comment_id}");
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}
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public function onSetupBuilding(SetupBuildingEvent $event)
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{
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$sb = new SetupBlock("Comment Options");
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$sb->add_bool_option("comment_captcha", "Require CAPTCHA for anonymous comments: ");
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$sb->add_label("<br>Limit to ");
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$sb->add_int_option("comment_limit");
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$sb->add_label(" comments per ");
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$sb->add_int_option("comment_window");
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$sb->add_label(" minutes");
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$sb->add_label("<br>Show ");
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$sb->add_int_option("comment_count");
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$sb->add_label(" recent comments on the index");
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$sb->add_label("<br>Show ");
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$sb->add_int_option("comment_list_count");
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$sb->add_label(" comments per image on the list");
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$sb->add_label("<br>Make samefags public ");
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$sb->add_bool_option("comment_samefags_public");
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$event->panel->add_block($sb);
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}
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public function onSearchTermParse(SearchTermParseEvent $event)
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{
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$matches = [];
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if (preg_match("/^comments([:]?<|[:]?>|[:]?<=|[:]?>=|[:|=])(\d+)$/i", $event->term, $matches)) {
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$cmp = ltrim($matches[1], ":") ?: "=";
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$comments = $matches[2];
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$event->add_querylet(new Querylet("images.id IN (SELECT DISTINCT image_id FROM comments GROUP BY image_id HAVING count(image_id) $cmp $comments)"));
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} elseif (preg_match("/^commented_by[=|:](.*)$/i", $event->term, $matches)) {
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$user = User::by_name($matches[1]);
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if (!is_null($user)) {
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$user_id = $user->id;
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} else {
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$user_id = -1;
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}
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$event->add_querylet(new Querylet("images.id IN (SELECT image_id FROM comments WHERE owner_id = $user_id)"));
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} elseif (preg_match("/^commented_by_userno[=|:]([0-9]+)$/i", $event->term, $matches)) {
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$user_id = int_escape($matches[1]);
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$event->add_querylet(new Querylet("images.id IN (SELECT image_id FROM comments WHERE owner_id = $user_id)"));
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}
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}
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// page building {{{
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private function build_page(int $current_page)
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{
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global $database, $user;
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$where = SPEED_HAX ? "WHERE posted > now() - interval '24 hours'" : "";
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$total_pages = $database->cache->get("comment_pages");
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if (empty($total_pages)) {
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$total_pages = (int)($database->get_one("
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SELECT COUNT(c1)
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FROM (SELECT COUNT(image_id) AS c1 FROM comments $where GROUP BY image_id) AS s1
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") / 10);
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$database->cache->set("comment_pages", $total_pages, 600);
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}
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$total_pages = max($total_pages, 1);
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$current_page = clamp($current_page, 1, $total_pages);
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$threads_per_page = 10;
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$start = $threads_per_page * ($current_page - 1);
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$result = $database->Execute("
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SELECT image_id,MAX(posted) AS latest
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FROM comments
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$where
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GROUP BY image_id
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ORDER BY latest DESC
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LIMIT :limit OFFSET :offset
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", ["limit"=>$threads_per_page, "offset"=>$start]);
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$user_ratings = ext_is_live("Ratings") ? Ratings::get_user_privs($user) : "";
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$images = [];
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while ($row = $result->fetch()) {
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$image = Image::by_id($row["image_id"]);
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if (
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ext_is_live("Ratings") && !is_null($image) &&
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strpos($user_ratings, $image->rating) === false
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) {
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$image = null; // this is "clever", I may live to regret it
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}
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if (!is_null($image)) {
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$comments = $this->get_comments($image->id);
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$images[] = [$image, $comments];
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}
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}
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$this->theme->display_comment_list($images, $current_page, $total_pages, $user->can("create_comment"));
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}
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// }}}
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// get comments {{{
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/**
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* #return Comment[]
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*/
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private function get_generic_comments(string $query, array $args): array
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{
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global $database;
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$rows = $database->get_all($query, $args);
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$comments = [];
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foreach ($rows as $row) {
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$comments[] = new Comment($row);
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}
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return $comments;
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}
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/**
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* #return Comment[]
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*/
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private function get_recent_comments(int $count): array
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{
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return $this->get_generic_comments("
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SELECT
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users.id as user_id, users.name as user_name, users.email as user_email, users.class as user_class,
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comments.comment as comment, comments.id as comment_id,
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comments.image_id as image_id, comments.owner_ip as poster_ip,
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comments.posted as posted
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FROM comments
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LEFT JOIN users ON comments.owner_id=users.id
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ORDER BY comments.id DESC
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LIMIT :limit
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", ["limit"=>$count]);
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}
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/**
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* #return Comment[]
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*/
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private function get_user_comments(int $user_id, int $count, int $offset=0): array
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{
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return $this->get_generic_comments("
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SELECT
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users.id as user_id, users.name as user_name, users.email as user_email, users.class as user_class,
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comments.comment as comment, comments.id as comment_id,
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comments.image_id as image_id, comments.owner_ip as poster_ip,
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comments.posted as posted
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FROM comments
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LEFT JOIN users ON comments.owner_id=users.id
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WHERE users.id = :user_id
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ORDER BY comments.id DESC
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LIMIT :limit OFFSET :offset
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", ["user_id"=>$user_id, "offset"=>$offset, "limit"=>$count]);
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}
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/**
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* #return Comment[]
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*/
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private function get_comments(int $image_id): array
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{
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return $this->get_generic_comments("
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SELECT
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users.id as user_id, users.name as user_name, users.email as user_email, users.class as user_class,
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comments.comment as comment, comments.id as comment_id,
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comments.image_id as image_id, comments.owner_ip as poster_ip,
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comments.posted as posted
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FROM comments
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LEFT JOIN users ON comments.owner_id=users.id
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WHERE comments.image_id=:image_id
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ORDER BY comments.id ASC
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", ["image_id"=>$image_id]);
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}
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// }}}
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// add / remove / edit comments {{{
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private function is_comment_limit_hit(): bool
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{
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global $config, $database;
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// sqlite fails at intervals
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if ($database->get_driver_name() === "sqlite") {
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return false;
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}
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$window = int_escape($config->get_int('comment_window'));
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$max = int_escape($config->get_int('comment_limit'));
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if ($database->get_driver_name() == "mysql") {
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$window_sql = "interval $window minute";
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} else {
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$window_sql = "interval '$window minute'";
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}
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// window doesn't work as an SQL param because it's inside quotes >_<
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|
$result = $database->get_all("
|
|
SELECT *
|
|
FROM comments
|
|
WHERE owner_ip = :remote_ip AND posted > now() - $window_sql
|
|
", ["remote_ip"=>$_SERVER['REMOTE_ADDR']]);
|
|
|
|
return (count($result) >= $max);
|
|
}
|
|
|
|
private function hash_match(): bool
|
|
{
|
|
return ($_POST['hash'] == $this->get_hash());
|
|
}
|
|
|
|
/**
|
|
* get a hash which semi-uniquely identifies a submission form,
|
|
* to stop spam bots which download the form once then submit
|
|
* many times.
|
|
*
|
|
* FIXME: assumes comments are posted via HTTP...
|
|
*/
|
|
public static function get_hash(): string
|
|
{
|
|
return md5($_SERVER['REMOTE_ADDR'] . date("%Y%m%d"));
|
|
}
|
|
|
|
private function is_spam_akismet(string $text): bool
|
|
{
|
|
global $config, $user;
|
|
if (strlen($config->get_string('comment_wordpress_key')) > 0) {
|
|
$comment = [
|
|
'author' => $user->name,
|
|
'email' => $user->email,
|
|
'website' => '',
|
|
'body' => $text,
|
|
'permalink' => '',
|
|
];
|
|
|
|
# akismet breaks if there's no referrer in the environment; so if there
|
|
# isn't, supply one manually
|
|
if (!isset($_SERVER['HTTP_REFERER'])) {
|
|
$comment['referrer'] = 'none';
|
|
log_warning("comment", "User '{$user->name}' commented with no referrer: $text");
|
|
}
|
|
if (!isset($_SERVER['HTTP_USER_AGENT'])) {
|
|
$comment['user_agent'] = 'none';
|
|
log_warning("comment", "User '{$user->name}' commented with no user-agent: $text");
|
|
}
|
|
|
|
$akismet = new Akismet(
|
|
$_SERVER['SERVER_NAME'],
|
|
$config->get_string('comment_wordpress_key'),
|
|
$comment
|
|
);
|
|
|
|
if ($akismet->errorsExist()) {
|
|
return false;
|
|
} else {
|
|
return $akismet->isSpam();
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
private function is_dupe(int $image_id, string $comment): bool
|
|
{
|
|
global $database;
|
|
return (bool)$database->get_row("
|
|
SELECT *
|
|
FROM comments
|
|
WHERE image_id=:image_id AND comment=:comment
|
|
", ["image_id"=>$image_id, "comment"=>$comment]);
|
|
}
|
|
// do some checks
|
|
|
|
private function add_comment_wrapper(int $image_id, User $user, string $comment)
|
|
{
|
|
global $database, $page;
|
|
|
|
if (!$user->can("bypass_comment_checks")) {
|
|
// will raise an exception if anything is wrong
|
|
$this->comment_checks($image_id, $user, $comment);
|
|
}
|
|
|
|
// all checks passed
|
|
if ($user->is_anonymous()) {
|
|
$page->add_cookie("nocache", "Anonymous Commenter", time()+60*60*24, "/");
|
|
}
|
|
$database->Execute(
|
|
"INSERT INTO comments(image_id, owner_id, owner_ip, posted, comment) ".
|
|
"VALUES(:image_id, :user_id, :remote_addr, now(), :comment)",
|
|
["image_id"=>$image_id, "user_id"=>$user->id, "remote_addr"=>$_SERVER['REMOTE_ADDR'], "comment"=>$comment]
|
|
);
|
|
$cid = $database->get_last_insert_id('comments_id_seq');
|
|
$snippet = substr($comment, 0, 100);
|
|
$snippet = str_replace("\n", " ", $snippet);
|
|
$snippet = str_replace("\r", " ", $snippet);
|
|
log_info("comment", "Comment #$cid added to Image #$image_id: $snippet", null, ["image_id"=>$image_id, "comment_id"=>$cid]);
|
|
}
|
|
|
|
private function comment_checks(int $image_id, User $user, string $comment)
|
|
{
|
|
global $config, $page;
|
|
|
|
// basic sanity checks
|
|
if (!$user->can("create_comment")) {
|
|
throw new CommentPostingException("Anonymous posting has been disabled");
|
|
} elseif (is_null(Image::by_id($image_id))) {
|
|
throw new CommentPostingException("The image does not exist");
|
|
} elseif (trim($comment) == "") {
|
|
throw new CommentPostingException("Comments need text...");
|
|
} elseif (strlen($comment) > 9000) {
|
|
throw new CommentPostingException("Comment too long~");
|
|
}
|
|
|
|
// advanced sanity checks
|
|
elseif (strlen($comment)/strlen(gzcompress($comment)) > 10) {
|
|
throw new CommentPostingException("Comment too repetitive~");
|
|
} elseif ($user->is_anonymous() && !$this->hash_match()) {
|
|
$page->add_cookie("nocache", "Anonymous Commenter", time()+60*60*24, "/");
|
|
throw new CommentPostingException(
|
|
"Comment submission form is out of date; refresh the ".
|
|
"comment form to show you aren't a spammer~"
|
|
);
|
|
}
|
|
|
|
// database-querying checks
|
|
elseif ($this->is_comment_limit_hit()) {
|
|
throw new CommentPostingException("You've posted several comments recently; wait a minute and try again...");
|
|
} elseif ($this->is_dupe($image_id, $comment)) {
|
|
throw new CommentPostingException("Someone already made that comment on that image -- try and be more original?");
|
|
}
|
|
|
|
// rate-limited external service checks last
|
|
elseif ($config->get_bool('comment_captcha') && !captcha_check()) {
|
|
throw new CommentPostingException("Error in captcha");
|
|
} elseif ($user->is_anonymous() && $this->is_spam_akismet($comment)) {
|
|
throw new CommentPostingException("Akismet thinks that your comment is spam. Try rewriting the comment, or logging in.");
|
|
}
|
|
}
|
|
// }}}
|
|
}
|