[aur-dev] [PATCH] Make external links in comments clickable (FS#20137).

[Lukas Fleischer]

This is a bit hacky patch to make links in AUR comments clickable (fixes
FS#20137 [1]). Huge parts of this code are ripped from the DokuWiki
plugin that is also used in Flyspray.

I didn't have any time to test it extensively so I'd suggest to do some
more tests if this will be commited.

[1] https://bugs.archlinux.org/task/20137

---
 web/lib/aur.inc               |   45 +++++++++++++++++++++++++++++++++++++++++
 web/template/pkg_comments.php |    2 +-
 2 files changed, 46 insertions(+), 1 deletions(-)

diff --git a/web/lib/aur.inc b/web/lib/aur.inc
index bd69c4c..b0cfdc8 100644
--- a/web/lib/aur.inc
+++ b/web/lib/aur.inc
@@ -494,3 +494,48 @@ function salted_hash($passwd, $salt)
 	}
 	return md5($salt . $passwd);
 }
+
+function parse_link($matches)
+{
+  $name = $url = $matches[0];
+
+  if(substr($url, 0, 3) == 'ftp' && (substr($url, 0, 6) != 'ftp://')) {
+    $url = 'ftp://'.$url;
+  }
+  elseif (substr($url, 0, 3) == 'www') {
+    $url = 'http://'.$url;
+  }
+
+  $url = str_replace('&', '&', $url);
+  $url = str_replace('&', '&', $url);
+  $url = strtr($url, array('>' => '%3E', '<' => '%3C', '"' => '%22'));
+
+  return '<a href="' . $url . '">' . $name . '</a>';
+}
+
+function parse_comment($comment)
+{
+  $schemes = array('http', 'https', 'ftp');
+  $ltrs = '\w';
+  $gunk = '\/\#~:.?+=&%@!\-';
+  $punc = '.:?\-;,';
+  $host = $ltrs . $punc;
+  $any = $ltrs . $gunk . $punc;
+
+  $patterns = array();
+
+  foreach ($schemes as $scheme) {
+    $patterns[] = '(\b(?i)' . $scheme . '(?-i):\/\/[' . $any . ']+?(?=[' . $punc . ']*[^' . $any . ']))';
+  }
+
+  $patterns[] = '(\b(?i)www?(?-i)\.[' . $host . ']+?\.[' . $host . ']+?[' . $any . ']+?(?=[' . $punc . ']*[^' . $any . ']))';
+  $patterns[] = '(\b(?i)ftp?(?-i)\.['. $host . ']+?\.[' . $host . ']+?[' . $any . ']+?(?=[' . $punc . ']*[^' . $any . ']))';
+
+  $regex = '/' . implode('|', $patterns) . '/msS';
+
+  $comment = htmlspecialchars($comment);
+  $comment = preg_replace_callback($regex, parse_link, $comment . "\n");
+  $comment = nl2br($comment);
+
+  return $comment;
+}
diff --git a/web/template/pkg_comments.php b/web/template/pkg_comments.php
index 02171a0..2ca9bf0 100644
--- a/web/template/pkg_comments.php
+++ b/web/template/pkg_comments.php
@@ -20,7 +20,7 @@ while (list($indx, $carr) = each($comments)) { ?>
 ?></div>
 	<blockquote class="comment-body">
 	<div>
-<?php echo nl2br(htmlspecialchars($carr['Comments'])) ?>
+<?php echo parse_comment($carr['Comments']) ?>
 	</div>
 	</blockquote>
 <?php
-- 
1.7.3