mirror of https://github.com/BOINC/boinc.git
338 lines
11 KiB
PHP
338 lines
11 KiB
PHP
<?php
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// This file is part of BOINC.
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// http://boinc.berkeley.edu
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// Copyright (C) 2008 University of California
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//
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// BOINC is free software; you can redistribute it and/or modify it
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// under the terms of the GNU Lesser General Public License
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// as published by the Free Software Foundation,
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// either version 3 of the License, or (at your option) any later version.
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//
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// BOINC is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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// See the GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with BOINC. If not, see <http://www.gnu.org/licenses/>.
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// Functions that process user-supplied text (e.g. messages)
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// prior to displaying it to users.
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// Goals:
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// - Security (don't send evil javascript)
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// - obey user preferences
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// - improve formatting (e.g., convert newlines to <br> tags)
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require_once('../inc/sanitize_html.inc');
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class output_options {
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var $bb2html; // BBCode as HTML? (on)
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var $images_as_links; // Images as hyperlinks? (off)
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var $link_popup; // Links in new windows? (off)
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var $nl2br; // Convert newlines to <br>'s? (on)
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var $htmlitems; // Convert special chars to HTML entities? (on)
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var $htmlscrub; // Scrub "bad" HTML tags? (off)
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var $highlight_terms;// Array of terms to be highlighted (off)
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// Constructor - set the defaults.
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function __construct() {
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$this->bb2html = 1;
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$this->images_as_links = 0;
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$this->link_popup = 0;
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$this->nl2br = 1;
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$this->htmlitems = 1;
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$this->htmlscrub = 0;
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$this->highlight_terms = 0;
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return true;
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}
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// Define the terms to be highlighted (for use with searches and such)
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function setHighlightTerms($terms) {
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if (is_array($terms)) {
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$this->highlight_terms = $terms;
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} else {
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return false;
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}
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return true;
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}
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}
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// Do the actual transformation of the text.
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// TODO: Make this part of the above class.
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function output_transform($text, $options = NULL) {
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// Options is a output_options object, defined above
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if (!$options) {
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$options = new output_options; // Defaults in the class definition
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}
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if ($options->htmlitems) {
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$text = htmlspecialchars($text, ENT_COMPAT | ENT_HTML401 | ENT_SUBSTITUTE);
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}
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if (is_array($options->highlight_terms)) {
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$text = highlight_terms($text, $options->highlight_terms);
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}
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// if ($options->htmlscrub) {
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// $text = sanitize_html($text);
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// }
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if ($options->nl2br) {
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$text = nl2br($text);
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}
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if ($options->bb2html) {
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$text = bb2html($text);
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}
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if ($options->images_as_links) {
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$text = image_as_link($text);
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}
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if ($options->link_popup) {
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$text = externalize_links($text);
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}
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return $text;
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}
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function get_output_options($user) {
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$options = new output_options();
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if ($user) {
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if ($user->prefs->images_as_links) $options->images_as_links = 1;
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if ($user->prefs->link_popup) $options->link_popup = 1;
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}
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return $options;
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}
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// Converts bbcode to HTML
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// If $export is true, don't use BOINC CSS
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function substr2($s, $n1, $n2) {
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return substr($s, $n1, $n2-$n1);
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}
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// process non-nestable constructs: [pre] and [code]
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//
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function replace_pre_code($text, $export) {
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$out = '';
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$pos = 0;
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while (true) {
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$n1 = strpos($text, '[code]', $pos);
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$n2 = strpos($text, '[pre]', $pos);
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if ($n1 === false && $n2 === false) {
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$out .= substr($text, $pos);
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break;
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}
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if ($n1 === false) $n1 = 9999;
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if ($n2 === false) $n2 = 9999;
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if ($n1 < $n2) {
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$n = $n1;
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$tag = '[code]';
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$tag2 = '[/code]';
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} else {
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$n = $n2;
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$tag = '[pre]';
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$tag2 = '[/pre]';
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}
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$out .= substr2($text, $pos, $n);
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$n2 = strpos($text, $tag2, $n);
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$n += strlen($tag);
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if (!$n2) {
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$out .= substr($text, $n);
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break;
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}
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$x = substr2($text, $n, $n2);
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$x = remove_br($x);
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$x = htmlspecialchars($x, ENT_COMPAT, "UTF-8", false);
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$x = str_replace("[", "[", $x);
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if ($export) {
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if ($tag == '[pre]') {
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$out .= "<pre>$x</pre>";
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} else {
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$out .= "<code>$x</code>";
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}
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} else {
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$out .= "<pre style=\"white-space:pre-wrap;\">$x</pre>";
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}
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$pos = $n2 + strlen($tag2);
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}
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return $out;
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}
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// process nestable constructs
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//
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function bb2html_aux($text, $export) {
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$urlregex = "(?:\"?)(?:(http\:\/\/)?)([^\[\"<\ ]+)(?:\"?)";
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// NOTE:
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// This matches https:// too; I don't understand why.
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// sample results:
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// Array
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// (
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// [0] => [img]https://a.b.c[/img]
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// [1] =>
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// [2] => https://a.b.c
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// )
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// Array
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// (
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// [0] => [img]http://a.b.c[/img]
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// [1] => http://
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// [2] => a.b.c
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// )
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$httpsregex = "(?:\"?)https\:\/\/([^\[\"<\ ]+)(?:\"?)";
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// List of allowable tags
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$bbtags = array (
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"@\[b\](.*?)\[/b\]@is",
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"@\[i\](.*?)\[/i\]@is",
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"@\[u\](.*?)\[/u\]@is",
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"@\[s\](.*?)\[/s\]@is",
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"@\[sup\](.*?)\[/sup\]@is",
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"@\[url=$httpsregex\](.*?)\[/url\]@is",
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"@\[url\]$httpsregex\[/url\]@is",
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"@\[link=$urlregex\](.*?)\[/link\]@is",
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"@\[link\]$urlregex\[/link\]@is",
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"@\[url=$urlregex\](.*?)\[/url\]@is",
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"@\[url\]$urlregex\[/url\]@is",
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"@\[quote=(.*?)\](.*?)\[/quote\]@is",
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"@\[quote\](.*?)\[/quote\]@is",
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"@\[list\](.*?)\[/list\]@is",
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"@\[list=1\](.*?)\[/list\]@is",
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"@\[img\]$urlregex\[/img\]@is",
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"@\[sm_img\]$urlregex\[/sm_img\]@is",
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"@\[color=(?:\"?)(.{3,8})(?:\"?)\](.*?)\[/color\]@is",
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"@((?:<ol>|<ul>).*?)\n\*([^\n]+)\n(.*?(</ol>|</ul>))@is",
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"@\[size=([1-9]|[0-2][0-9])\](.*?)\[/size\]@is",
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"@\[mailto\](.*?)\[/mailto\]@is",
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"@\[email\](.*?)\[/email\]@is",
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"@\[github\](?:\#|ticket:)(\d+)\[/github\]@is",
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"@\[github\]wiki:(.*?)\[/github\]@is",
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);
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// What the above tags are turned in to
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if ($export) {
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$htmltags = array (
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"<b>\\1</b>",
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"<i>\\1</i>",
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"<u>\\1</u>",
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"<s>\\1</s>",
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"<sup>\\1</sup>",
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"<a href=\"https://\\1\" rel=\"nofollow\">\\2</a>",
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"<a href=\"https://\\1\" rel=\"nofollow\">https://\\1</a>",
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"<a href=\"http://\\2\" rel=\"nofollow\">\\3</a>",
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"<a href=\"http://\\2\" rel=\"nofollow\">http://\\2</a>",
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"<a href=\"http://\\2\" rel=\"nofollow\">\\3</a>",
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"<a href=\"http://\\2\" rel=\"nofollow\">http://\\2</a>",
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"<i>\\1 wrote:</i><blockquote>\\2</blockquote>",
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"<blockquote>\\1</blockquote>",
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"<ul>\\1</ul><p>",
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"<ol>\\1</ol><p>",
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"<img hspace=\"8\" src=\"\\1\\2\"> ",
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"<img hspace=\"8\" width=400 src=\"\\1\\2\"> ",
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"<font color=\"\\1\">\\2</font>",
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"\\1<li>\\2\n\\3",
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"<span style=\"font-size: \\1px;\">\\2</span>",
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"<a href=\"mailto:\\1\">\\1</a>",
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"<a href=\"mailto:\\1\">\\1</a>",
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"<a href=\"https://github.com/BOINC/boinc/issues/\\1\">#\\1</a>",
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"<a href=\"https://github.com/BOINC/boinc/wiki/\\1\">\\1</a>",
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);
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} else {
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$htmltags = array (
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"<b>\\1</b>",
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"<i>\\1</i>",
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"<u>\\1</u>",
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"<s>\\1</s>",
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"<sup>\\1</sup>",
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"<a href=\"https://\\1\" rel=\"nofollow\">\\2</a>",
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"<a href=\"https://\\1\" rel=\"nofollow\">https://\\1</a>",
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"<a href=\"http://\\2\" rel=\"nofollow\">\\3</a>",
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"<a href=\"http://\\2\" rel=\"nofollow\">http://\\2</a>",
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"<a href=\"http://\\2\" rel=\"nofollow\">\\3</a>",
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"<a href=\"http://\\2\" rel=\"nofollow\">http://\\2</a>",
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"<em>\\1 wrote:</em><blockquote>\\2</blockquote>",
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"<blockquote>\\1</blockquote>",
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"<ul>\\1</ul><p>",
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"<ol>\\1</ol><p>",
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"<img hspace=\"8\" class=\"img-responsive\" src=\"\\1\\2\"> ",
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"<img hspace=\"8\" width=400 src=\"\\1\\2\"> ",
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"<font color=\"\\1\">\\2</font>",
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"\\1<li>\\2\n\\3",
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"<span style=\"font-size: \\1px;\">\\2</span>",
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"<a href=\"mailto:\\1\">\\1</a>",
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"<a href=\"mailto:\\1\">\\1</a>",
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"<a href=\"https://github.com/BOINC/boinc/issues/\\1\">#\\1</a>",
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"<a href=\"https://github.com/BOINC/boinc/wiki/\\1\">\\1</a>",
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);
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}
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// Do the actual replacing - iterations for nested items
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$lasttext = "";
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$i = 0;
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// $i<1000 to prevent DoS
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while ($text != $lasttext && $i<1000) {
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$lasttext = $text;
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$text = preg_replace($bbtags, $htmltags, $text);
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$i = $i + 1;
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}
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$text = str_replace("<ul>", '<ul style="word-break:break-word;">', $text);
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$text = str_replace("<ol>", '<ol style="word-break:break-word;">', $text);
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return $text;
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}
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function bb2html($text, $export=false) {
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$text = replace_pre_code($text, $export);
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return bb2html_aux($text, $export);
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}
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// Remove any <br> tags added by nl2br which are not wanted,
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// for example inside <pre> containers
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// The original \n was retained after the br when it was added
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//
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function remove_br($text){
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return str_replace("<br />", "", $text);
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}
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// Make links open in new windows.
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//
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function externalize_links($text) {
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// TODO: Convert this to PCRE
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$i=0;
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$linkpos=true;
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$out = "";
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while (true){
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//Find a link
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//
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$linkpos=strpos($text, "<a ", $i);
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if ($linkpos===false) break;
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//Replace with target='_new'
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//
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$out .= substr($text, $i, $linkpos-$i)."<a target=\"_new\" ";
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$i = $linkpos+3;
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}
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$out .= substr($text, $i);
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return $out;
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}
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// Converts image tags to links to the images.
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function image_as_link($text){
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/* This function depends on sanitized HTML */
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// Build some regex (should be a *lot* faster)
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$pattern = '@<img([\S\s]+?)src=([^>]+?)>@si';
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$replacement = '<a href=${2}>[Image link]</a>'; // Turns that URL into a hyperlink
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$text = preg_replace($pattern, $replacement, $text);
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return $text;
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}
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// Highlight terms in text (most likely used with searches)
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function highlight_terms($text, $terms) {
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$search = $terms;
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$replace = array();
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foreach ($search as $key => $value) {
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$replace[$key] = "<span class=\"mark\">".$value."</span>";
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}
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return str_ireplace($search, $replace, $text);
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}
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$cvs_version_tracker[]="\$Id$"; //Generated automatically - do not edit
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?>
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