functions/url_parser.php

   1 <?php
   2    /* URL Passing code to allow links from with in emails */
   3    /* $Id$ */
   4
   5    $url_parser_php = true;
   6
   7    function replaceBlock (&$in, $replace, $start, $end) {
   8       $begin = substr($in,0,$start);
   9       $end   = substr($in,$end,strlen($in)-$end);
  10       $in    = $begin.$replace.$end;
  11    }
  12
  13    // Having this defined in just one spot could help when changes need
  14    // to be made to the pattern
  15    // Make sure that the expression is evaluated case insensitively
  16    //
  17    // Here's pretty sophisticated IP matching:
  18    // $IPMatch = '(2[0-5][0-9]|1?[0-9]{1,2})';
  19    // $IPMatch = '\[?' . $IPMatch . '(\.' . $IPMatch . '){3}\]?';
  20    //
  21    // Here's enough:
  22    $IP_RegExp_Match = '\\[?[0-9]{1,3}(\\.[0-9]{1,3}){3}\\]?';
  23    $Host_RegExp_Match = '(' . $IP_RegExp_Match .
  24        '|[0-9a-z]([-.]?[0-9a-z])*\\.[a-z][a-z]+)';
  25    $Email_RegExp_Match = '[0-9a-z]([-_.]?[0-9a-z])*(%' . $Host_RegExp_Match .
  26        ')?@' . $Host_RegExp_Match;
  27
  28    function parseEmail (&$body) {
  29       global $color, $Email_RegExp_Match;
  30       $Size = strlen($body);
  31
  32       /*
  33         This is here in case we ever decide to use highlighting of searched
  34         text.  this does it for email addresses
  35
  36       if ($what && ($where == "BODY" || $where == "TEXT")) {
  37          eregi ($Email_RegExp_Match, $body, $regs);
  38          $oldaddr = $regs[0];
  39          if ($oldaddr) {
  40             $newaddr = eregi_replace ($what, "<b><font color=\"$color[2]\">$what</font></font></b>", $oldaddr);
  41             $body = str_replace ($oldaddr, "<a href=\"../src/compose.php?send_to=$oldaddr\">$newaddr</a>", $body);
  42          }
  43       } else {
  44          $body = eregi_replace ($Email_RegExp_Match, "<a href=\"../src/compose.php?send_to=\\0\">\\0</a>", $body);
  45       }
  46       */
  47
  48       $body = eregi_replace ($Email_RegExp_Match, "<a href=\"../src/compose.php?send_to=\\0\">\\0</a>", $body);
  49
  50       // If there are any changes, it'll just get bigger.
  51       if ($Size != strlen($body))
  52           return 1;
  53       return 0;
  54    }
  55
  56
  57    // We don't want to re-initialize this stuff for every line.  Save work
  58    // and just do it once here.
  59    $url_parser_url_tokens = array(
  60        'http://',
  61        'https://',
  62        'ftp://',
  63        'telnet:',  // Special case -- doesn't need the slashes
  64        'gopher://',
  65        'news://');
  66
  67    $url_parser_poss_ends = array(' ', "\n", "\r", '<', '>', ".\r", ".\n",
  68        '.&nbsp;', '&nbsp;', ')', '(', '&quot;', '&lt;', '&gt;', '.<',
  69        ']', '[', '{', '}', "\240");
  70
  71
  72    function parseUrl (&$body)
  73    {
  74       global $url_parser_poss_ends, $url_parser_url_tokens;;
  75       $start = 0;
  76       $target_pos = strlen($body);
  77
  78       while ($start != $target_pos)
  79       {
  80         $target_token = '';
  81
  82         // Find the first token to replace
  83         foreach ($url_parser_url_tokens as $the_token)
  84         {
  85           $pos = strpos(strtolower($body), $the_token, $start);
  86           if (is_int($pos) && $pos < $target_pos)
  87           {
  88             $target_pos = $pos;
  89             $target_token = $the_token;
  90           }
  91         }
  92
  93         // Look for email addresses between $start and $target_pos
  94         $check_str = substr($body, $start, $target_pos);
  95
  96         if (parseEmail($check_str))
  97         {
  98           replaceBlock($body, $check_str, $start, $target_pos);
  99           $target_pos = strlen($check_str) + $start;
 100         }
 101
 102         // If there was a token to replace, replace it
 103         if ($target_token != '')
 104         {
 105           // Find the end of the URL
 106           $end=strlen($body);
 107           foreach ($url_parser_poss_ends as $key => $val)
 108           {
 109             $enda = strpos($body,$val,$target_pos);
 110             if (is_int($enda) && $enda < $end)
 111               $end = $enda;
 112           }
 113
 114           // Extract URL
 115           $url = substr($body, $target_pos, $end-$target_pos);
 116
 117           // Replace URL with HyperLinked Url, requires 1 char in link
 118           if ($url != '' && $url != $target_token)
 119           {
 120             $url_str = "<a href=\"$url\" target=\"_blank\">$url</a>";
 121             replaceBlock($body,$url_str,$target_pos,$end);
 122             $target_pos += strlen($url_str);
 123           }
 124           else
 125           {
 126              // Not quite a valid link, skip ahead to next chance
 127              $target_pos += strlen($target_token);
 128           }
 129         }
 130
 131         // Move forward
 132         $start = $target_pos;
 133         $target_pos = strlen($body);
 134       }
 135    }
 136
 137 ?>