drupal/includes/comment.inc

<?php

// Security check:
if (strstr($id, " ") || strstr($pid, " ") || strstr($lid, " ") || strstr($mode, " ") || strstr($order, " ") || strstr($threshold, " ")) {
  watchdog("error", "comment: attempt to provide malicious input through URI");
  exit();
}

$cmodes = array(1 => "List - min", 2 => "List - max", 3 => "Threaded - min", 4 => "Threaded - max");
$corder = array(1 => "Date - new", 2 => "Date - old", 3 => "Rate - high", 4 => "Rate - low");

class Comment {
  function Comment($userid, $subject, $comment, $timestamp, $url, $fake_email, $score, $votes, $cid, $lid) {
    $this->userid = $userid;
    $this->subject = $subject;
    $this->comment = $comment;
    $this->timestamp = $timestamp;
    $this->url = $url;
    $this->fake_email = $fake_email;
    $this->score = $score;
    $this->votes = $votes;
    $this->cid = $cid;
    $this->lid = $lid;
  }
}

function comment_moderate($moderate) {
  global $user, $comment_votes;

  if ($user->id && $moderate) {
    $none = $comment_votes[key($comment_votes)];

    foreach ($moderate as $id=>$vote) {
      if ($vote != $comment_votes[$none]) {
        $id = check_input($id); $vote = check_input($vote);
        $comment = db_fetch_object(db_query("SELECT * FROM comments WHERE cid = '$id'"));
        if ($comment && !field_get($comment->users, $user->userid)) {
          $result = db_query("UPDATE comments SET score = score $vote, votes = votes + 1, users = '". field_set($comment->users, $user->userid, $vote) ."' WHERE cid = '$id'");
        }
      }
    }
  }
}

function comment_settings($mode, $order, $threshold) {
  global $user;
  if ($user->id) $user = user_save($user, array("mode" => $mode, "sort" => $order, "threshold" => $threshold));
}

function comment_reply($pid, $id) {
  global $allowed_html, $REQUEST_URI, $theme, $user;

  if ($pid) {
    $item = db_fetch_object(db_query("SELECT comments.*, users.userid FROM comments LEFT JOIN users ON comments.author = users.id WHERE comments.cid = '$pid'"));
    comment_view(new Comment($item->userid, $item->subject, $item->comment, $item->timestamp, $item->url, $item->fake_email, comment_score($comment), $comment->votes, $item->cid, $item->lid), t("reply to this comment"));
  }
  else $pid = 0;

  // Build reply form:
  $output .= "<FORM ACTION=\"$REQUEST_URI\" METHOD=\"post\">\n";

  // Name field:
  $output .= "<B>". t("Your name") .":</B><BR>\n";
  $output .= format_username($user->userid) ."<P>\n";

  // Subject field:
  $output .= "<B>". t("Subject") .":</B><BR>\n";
  $output .= "<INPUT TYPE=\"text\" NAME=\"subject\" SIZE=\"50\" MAXLENGTH=\"60\"><P>\n";

  // Comment field:
  $output .= "<B>".t("Comment") .":</B><BR>\n";
  $output .= "<TEXTAREA WRAP=\"virtual\" COLS=\"50\" ROWS=\"10\" NAME=\"comment\">". check_textarea($user->signature) ."</TEXTAREA><BR>\n";
  $output .= "<SMALL><I>". t("Allowed HTML tags") .": ". htmlspecialchars($allowed_html) .".</I></SMALL><P>\n";

  // Preview button:
  $output .= "<SMALL><I>". t("You must preview at least once before you can submit") .":</I></SMALL><BR>\n";
  $output .= "<INPUT TYPE=\"hidden\" NAME=\"pid\" VALUE=\"$pid\">\n";
  $output .= "<INPUT TYPE=\"hidden\" NAME=\"id\" VALUE=\"$id\">\n";
  $output .= "<INPUT TYPE=\"submit\" NAME=\"op\" VALUE=\"". t("Preview comment") ."\"><BR>\n";

  $output .= "</FORM>\n";

  $theme->box(t("Reply"), $output);
}

function comment_preview($pid, $id, $subject, $comment) {
  global $allowed_html, $REQUEST_URI, $theme, $user;

  // Preview comment:
  comment_view(new Comment($user->userid, $subject, $comment, time(), $user->url, $user->fake_email, 0, 0, 0, 0), t("reply to this comment"));

  // Build reply form:
  $output .= "<FORM ACTION=\"$REQUEST_URI\" METHOD=\"post\">\n";

  // Name field:
  $output .= "<B>". t("Your name") .":</B><BR>\n";
  $output .= format_username($user->userid) ."<P>\n";

  // Subject field:
  $output .= "<B>". t("Subject") .":</B><BR>\n";
  $output .= "<INPUT TYPE=\"text\" NAME=\"subject\" SIZE=\"50\" MAXLENGTH=\"60\" VALUE=\"". check_textfield($subject) ."\"><P>\n";

  // Comment field:
  $output .= "<B>". t("Comment") .":</B><BR>\n";
  $output .= "<TEXTAREA WRAP=\"virtual\" COLS=\"50\" ROWS=\"10\" NAME=\"comment\">". check_textarea($comment) ."</TEXTAREA><BR>\n";
  $output .= "<SMALL><I>". t("Allowed HTML tags") .": ". htmlspecialchars($allowed_html) .".</I></SMALL><P>\n";

  // Hidden fields:
  $output .= "<INPUT TYPE=\"hidden\" NAME=\"pid\" VALUE=\"$pid\">\n";
  $output .= "<INPUT TYPE=\"hidden\" NAME=\"id\" VALUE=\"$id\">\n";

  if (empty($subject)) {
    $output .= "<FONT COLOR=\"red\">". t("Warning: you did not supply a subject.") ."</FONT><P>\n";
  }

  // Preview and submit button:
  $output .= "<INPUT TYPE=\"submit\" NAME=\"op\" VALUE=\"". t("Preview comment") ."\">\n";
  $output .= "<INPUT TYPE=\"submit\" NAME=\"op\" VALUE=\"". t("Post comment") ."\">\n";
  $output .= "</FORM>\n";

  $theme->box(t("Reply"), $output);
}

function comment_post($pid, $id, $subject, $comment) {
  global $theme, $user;

  // check comment submission rate:
  throttle("post comment", variable_get(max_comment_rate, 60));

  // check for duplicate comments:
  $duplicate = db_result(db_query("SELECT COUNT(cid) FROM comments WHERE pid = '$pid' AND lid = '$id' AND subject = '$subject' AND comment = '$comment'"), 0);

  if ($duplicate != 0) {
    watchdog("warning", "comment: duplicate '$subject'");
  }
  else {
    // validate subject:
    $subject = ($subject) ? $subject : substr($comment, 0, 29);

    // add watchdog entry:
    watchdog("special", "comment: added '$subject'");

    // add comment to database:
    db_query("INSERT INTO comments (lid, pid, author, subject, comment, hostname, timestamp, score) VALUES ('$id', '$pid', '$user->id', '$subject', '$comment', '". getenv("REMOTE_ADDR") ."', '". time() ."', '". ($user->userid ? 1 : 0) ."')");
  }
}

function comment_score($comment) {
  $value = ($comment->votes) ? ($comment->score / $comment->votes) : (($comment->score) ? $comment->score : 0);
  return ((strpos($value, ".")) ? substr($value ."00", 0, 4) : $value .".00");
}

function comment_num_replies($id, $count = 0) {
  $result = db_query("SELECT COUNT(cid) FROM comments WHERE pid = '$id'");
  return ($result) ? db_result($result, 0) : 0;
}

function comment_moderation($comment) {
  global $comment_votes, $op, $user;

  if ($op == "reply") {
    // preview comment:
    $output .= "&nbsp;";
  }
  else if ($user->id && $user->userid != $comment->userid && !field_get($comment->users, $user->userid)) {
    // comment hasn't been moderated yet:
    foreach ($comment_votes as $key=>$value) $options .= " <OPTION VALUE=\"$value\">$key</OPTION>\n";
    $output .= "<SELECT NAME=\"moderate[$comment->cid]\">$options</SELECT>\n";
  }
  else {
    // comment has already been moderated:
    $output .= "<TABLE BORDER=\"0\" CELLSPACING=\"1\" CELLPADDING=\"1\"><TR><TD ALIGN=\"right\">". t("score") .":</TD><TD>". check_output($comment->score) ."</TD></TR><TR><TD ALIGN=\"right\">". t("votes") .":</TD><TD>". check_output($comment->votes) ."</TR></TABLE>\n";
  }

  return $output;
}

function comment_controls($threshold = 1, $mode = 3, $order = 1) {
  global $REQUEST_URI, $user;
  $output .= "<DIV ALIGN=\"CENTER\">\n";
  $output .= "<FORM METHOD=\"post\" ACTION=\"$REQUEST_URI\">\n";
  $output .= comment_mode(($user->id ? $user->mode : $mode));
  $output .= comment_order(($user->id ? $user->sort : $order));
  $output .= comment_threshold(($user->id ? $user->threshold : $threshold));
  $output .= "<INPUT TYPE=\"submit\" NAME=\"op\" VALUE=\"". t("Update settings") ."\">\n";
  $output .= "<INPUT TYPE=\"submit\" NAME=\"op\" VALUE=\"". t("Add comment") ."\">\n";
  $output .= "</FORM>\n";
  $output .= "</DIV>\n";
  return $output;
}

function comment_threshold($threshold) {
  for ($i = -1; $i < 6; $i++) $options .= " <OPTION VALUE=\"$i\"". ($threshold == $i ? " SELECTED" : "") .">". t("Filter") ." - $i</OPTION>";
  return "<SELECT NAME=\"threshold\">$options</SELECT>\n";
}

function comment_mode($mode) {
  global $cmodes;
  foreach ($cmodes as $key=>$value) $options .= " <OPTION VALUE=\"$key\"". ($mode == $key ? " SELECTED" : "") .">$value</OPTION>\n";
  return "<SELECT NAME=\"mode\">$options</SELECT>\n";
}

function comment_order($order) {
  global $corder;
  foreach ($corder as $key=>$value) $options .= " <OPTION VALUE=\"$key\"". ($order == $key ? " SELECTED" : "") .">$value</OPTION>\n";
  return "<SELECT NAME=\"order\">$options</SELECT>\n";
}

function comment_query($lid, $order, $pid = -1) {
  $query .= "SELECT c.*, u.* FROM comments c LEFT JOIN users u ON c.author = u.id WHERE c.lid = '$lid'";
  if ($pid >= 0) $query .= " AND pid = '$pid'";
  if ($order == 1) $query .= " ORDER BY c.timestamp DESC";
  else if ($order == 2) $query .= " ORDER BY c.timestamp";
  else if ($order == 3) $query .= " ORDER BY c.score DESC";
  else if ($order == 4) $query .= " ORDER BY c.score";
  return db_query($query);
}

function comment_visible($comment, $threshold = 0) {
  if ($comment->votes == 0 && $comment->score >= $threshold) return 1;
  else if ($comment->votes > 0 && $comment->score / $comment->votes >= $threshold) return 1;
  else return 0;
}

function comment_uri($args = 0) {
  global $mod;
  if ($args) return ($mod) ? "module.php?mod=$mod;$args" : "node.php?$args";
  else return ($mod) ? "module.php?mod=$mod" : "node.php";
}

function comment_link($comment, $return = 1) {
  global $theme;
  if ($return) return "<A HREF=\"". comment_uri("id=$comment->lid#$comment->cid") ."\"><FONT COLOR=\"$theme->type\">". t("return") ."</FONT></A> | <A HREF=\"". comment_uri("op=reply&id=$comment->lid&pid=$comment->cid") ."\"><FONT COLOR=\"$theme->type\">". t("reply to this comment") ."</FONT></A>";
  else return "<A HREF=\"". comment_uri("op=reply&id=$comment->lid&pid=$comment->cid") ."\"><FONT COLOR=\"$theme->type\">". t("reply to this comment") ."</FONT></A>";
}

function comment_view($comment, $folded = 0) {
  global $theme;

  // calculate comment's score:
  $comment->score = comment_score($comment);

  // display comment:
  if ($folded) $theme->comment($comment, $folded);
  else print "<A HREF=\"". comment_uri("id=$comment->lid&cid=$comment->cid#$comment->cid") ."\">". check_output($comment->subject) ."</A> by ". format_username($comment->userid) ." <SMALL>($comment->score)</SMALL><P>";
}

function comment_thread_min($cid, $threshold) {
  global $user;

  $result = db_query("SELECT c.*, u.* FROM comments c LEFT JOIN users u ON c.author = u.id WHERE c.pid = '$cid' ORDER BY c.timestamp, c.cid");

  print "<UL>";
  while ($comment = db_fetch_object($result)) {
    comment_view($comment);
    comment_thread_min($comment->cid, $threshold);
  }
  print "</UL>";
}

function comment_thread_max($cid, $mode, $threshold, $level = 0, $dummy = 0) {
  global $user;

  $result = db_query("SELECT c.*, u.* FROM comments c LEFT JOIN users u ON c.author = u.id WHERE c.pid = '$cid' ORDER BY c.timestamp, c.cid");

  print "<UL>";
  while ($comment = db_fetch_object($result)) {
    comment_view($comment, (comment_visible($comment, $threshold) ? comment_link($comment, 0) : 0));
    comment_thread_max($comment->cid, $mode, $threshold, $level + 1, $dummy + 1);
  }
  print "</UL>";
}

function comment_render($lid, $cid) {
  global $theme, $REQUEST_URI, $user;

  // Pre-process variables:
  $lid = empty($lid) ? 0 : $lid;
  $cid = empty($cid) ? 0 : $cid;
  $mode  = ($user->id) ? $user->mode : variable_get(default_comment_mode, 4);
  $order = ($user->id) ? $user->sort : variable_get(default_comment_order, 1);
  $threshold = ($user->id) ? $user->threshold : variable_get(default_comment_threshold, 3);

  if ($user->id) {
    // Comment control:
    $theme->box(t("Comment control"), comment_controls($threshold, $mode, $order));

    // Print moderation form:
    print "<FORM METHOD=\"post\" ACTION=\"$REQUEST_URI\">\n";
  }

  if ($cid > 0) {
    $result = db_query("SELECT c.*, u.* FROM comments c LEFT JOIN users u ON c.author = u.id WHERE cid = '$cid'");
    if ($comment = db_fetch_object($result)) {
      comment_view($comment, comment_link($comment));
    }
  }
  else {
    if ($mode == 1) {
      $result = comment_query($lid, $order);
      print "<TABLE BORDER=\"0\" CELLPADDING=\"2\" CELLSPACING=\"2\">\n";
      print " <TR><TH>Subject</TH><TH>Author</TH><TH>Date</TH><TH>Score</TH></TR>\n";
      while ($comment = db_fetch_object($result)) {
        if (comment_visible($comment, $threshold)) {
          print " <TR><TD><A HREF=\"". comment_uri("id=$comment->lid&cid=$comment->cid#$comment->cid") ."\">". check_output($comment->subject) ."</A></TD><TD>". format_username($comment->userid) ."</TD><TD>". format_date($comment->timestamp, "small") ."</TD><TD>". comment_score($comment) ."</TD></TR>\n";
        }
      }
      print "</TABLE>\n";
    }
    else if ($mode == 2) {
      $result = comment_query($lid, $order);
      while ($comment = db_fetch_object($result)) {
        comment_view($comment, (comment_visible($comment, $threshold) ? comment_link($comment, 0) : 0));
      }
    }
    else if ($mode == 3) {
      $result = comment_query($lid, $order, 0);
      while ($comment = db_fetch_object($result)) {
        comment_view($comment);
        comment_thread_min($comment->cid, $threshold);
      }
    }
    else {
      $result = comment_query($lid, $order, 0);
      while ($comment = db_fetch_object($result)) {
        comment_view($comment, (comment_visible($comment, $threshold) ? comment_link($comment, 0) : 0));
        comment_thread_max($comment->cid, $mode, $threshold, $level + 1);
      }
    }
  }

  if ($user->id) {
    // Print moderation form:
    print "  <INPUT TYPE=\"hidden\" NAME=\"id\" VALUE=\"$lid\">\n";
    print "  <INPUT TYPE=\"submit\" NAME=\"op\" VALUE=\"". t("Moderate comments") ."\">\n";
    print "</FORM>\n";
  }
}

?>