Merge pull request #886 from splitbrain/chris_pcre66_bug

Fix for issues #877 & #885 related to a bug in PCRE 6.6

1 files changed, 33 insertions, 1 deletions

diff --git a/lib/plugins/authplain/auth.php b/lib/plugins/authplain/auth.php
index b3ca988b9..3d303597c 100644
--- a/lib/plugins/authplain/auth.php
+++ b/lib/plugins/authplain/auth.php
@@ -17,6 +17,9 @@ class auth_plugin_authplain extends DokuWiki_Auth_Plugin {
     /** @var array filter pattern */
     protected $_pattern = array();
 
+    /** @var bool safe version of preg_split */
+    protected $_pregsplit_safe = false;
+
     /**
      * Constructor
      *
@@ -44,6 +47,8 @@ class auth_plugin_authplain extends DokuWiki_Auth_Plugin {
             $this->cando['getUsers']     = true;
             $this->cando['getUserCount'] = true;
         }
+
+        $this->_pregsplit_safe = version_compare(PCRE_VERSION,'6.7','>=');
     }
 
     /**
@@ -329,7 +334,7 @@ class auth_plugin_authplain extends DokuWiki_Auth_Plugin {
             if(empty($line)) continue;
 
             /* NB: preg_split can be deprecated/replaced with str_getcsv once dokuwiki is min php 5.3 */
-            $row = preg_split('/(?<![^\\\\]\\\\)\:/', $line, 5); // allow for : escaped as \:
+            $row = $this->_splitUserData($line);
             $row = str_replace('\\:', ':', $row);
             $row = str_replace('\\\\', '\\', $row);
 
@@ -342,6 +347,33 @@ class auth_plugin_authplain extends DokuWiki_Auth_Plugin {
         }
     }
 
+    protected function _splitUserData($line){
+        // due to a bug in PCRE 6.6, preg_split will fail with the regex we use here
+        // refer github issues 877 & 885
+        if ($this->_pregsplit_safe){
+            return preg_split('/(?<![^\\\\]\\\\)\:/', $line, 5);       // allow for : escaped as \:
+        }
+
+        $row = array();
+        $piece = '';
+        $len = strlen($line);
+        for($i=0; $i<$len; $i++){
+            if ($line[$i]=='\\'){
+                $piece .= $line[$i];
+                $i++;
+                if ($i>=$len) break;
+            } else if ($line[$i]==':'){
+                $row[] = $piece;
+                $piece = '';
+                continue;
+            }
+            $piece .= $line[$i];
+        }
+        $row[] = $piece;
+
+        return $row;
+    }
+
     /**
      * return true if $user + $info match $filter criteria, false otherwise
      *