functions/url_parser.php

   1 <?php
   2    /* URL Passing code to allow links from with in emails */
   3    /* $Id$ */
   4
   5    if (defined('url_parser_php'))
   6       return;
   7    define('url_parser_php', true);
   8
   9    function replaceBlock (&$in, $replace, $start, $end) {
  10       $begin = substr($in,0,$start);
  11       $end   = substr($in,$end,strlen($in)-$end);
  12       $in    = $begin.$replace.$end;
  13    }
  14
  15    // Having this defined in just one spot could help when changes need
  16    // to be made to the pattern
  17    // Make sure that the expression is evaluated case insensitively
  18    //
  19    // Here's pretty sophisticated IP matching:
  20    // $IPMatch = '(2[0-5][0-9]|1?[0-9]{1,2})';
  21    // $IPMatch = '\[?' . $IPMatch . '(\.' . $IPMatch . '){3}\]?';
  22    //
  23    // Here's enough:
  24    global $IP_RegExp_Match, $Host_RegExp_Match, $Email_RegExp_Match;
  25    $IP_RegExp_Match = '\\[?[0-9]{1,3}(\\.[0-9]{1,3}){3}\\]?';
  26    $Host_RegExp_Match = '(' . $IP_RegExp_Match .
  27        '|[0-9a-z]([-.]?[0-9a-z])*\\.[a-z][a-z]+)';
  28    $Email_RegExp_Match = '[0-9a-z]([-_.]?[0-9a-z])*(%' . $Host_RegExp_Match .
  29        ')?@' . $Host_RegExp_Match;
  30
  31    function parseEmail (&$body) {
  32       global $color, $Email_RegExp_Match;
  33       $Size = strlen($body);
  34
  35       /*
  36         This is here in case we ever decide to use highlighting of searched
  37         text.  this does it for email addresses
  38
  39       if ($what && ($where == "BODY" || $where == "TEXT")) {
  40          eregi ($Email_RegExp_Match, $body, $regs);
  41          $oldaddr = $regs[0];
  42          if ($oldaddr) {
  43             $newaddr = eregi_replace ($what, "<b><font color=\"$color[2]\">$what</font></font></b>", $oldaddr);
  44             $body = str_replace ($oldaddr, "<a href=\"../src/compose.php?send_to=$oldaddr\">$newaddr</a>", $body);
  45          }
  46       } else {
  47          $body = eregi_replace ($Email_RegExp_Match, "<a href=\"../src/compose.php?send_to=\\0\">\\0</a>", $body);
  48       }
  49       */
  50
  51       $body = eregi_replace ($Email_RegExp_Match, "<a href=\"../src/compose.php?send_to=\\0\">\\0</a>", $body);
  52
  53       // If there are any changes, it'll just get bigger.
  54       if ($Size != strlen($body))
  55           return 1;
  56       return 0;
  57    }
  58
  59
  60    // We don't want to re-initialize this stuff for every line.  Save work
  61    // and just do it once here.
  62    global $url_parser_url_tokens;
  63    $url_parser_url_tokens = array(
  64        'http://',
  65        'https://',
  66        'ftp://',
  67        'telnet:',  // Special case -- doesn't need the slashes
  68        'gopher://',
  69        'news://');
  70
  71    global $url_parser_poss_ends;
  72    $url_parser_poss_ends = array(' ', "\n", "\r", '<', '>', ".\r", ".\n",
  73        '.&nbsp;', '&nbsp;', ')', '(', '&quot;', '&lt;', '&gt;', '.<',
  74        ']', '[', '{', '}', "\240");
  75
  76
  77    function parseUrl (&$body)
  78    {
  79       global $url_parser_poss_ends, $url_parser_url_tokens;;
  80       $start = 0;
  81       $target_pos = strlen($body);
  82
  83       while ($start != $target_pos)
  84       {
  85         $target_token = '';
  86
  87         // Find the first token to replace
  88         foreach ($url_parser_url_tokens as $the_token)
  89         {
  90           $pos = strpos(strtolower($body), $the_token, $start);
  91           if (is_int($pos) && $pos < $target_pos)
  92           {
  93             $target_pos = $pos;
  94             $target_token = $the_token;
  95           }
  96         }
  97
  98         // Look for email addresses between $start and $target_pos
  99         $check_str = substr($body, $start, $target_pos);
 100
 101         if (parseEmail($check_str))
 102         {
 103           replaceBlock($body, $check_str, $start, $target_pos);
 104           $target_pos = strlen($check_str) + $start;
 105         }
 106
 107         // If there was a token to replace, replace it
 108         if ($target_token != '')
 109         {
 110           // Find the end of the URL
 111           $end=strlen($body);
 112           foreach ($url_parser_poss_ends as $key => $val)
 113           {
 114             $enda = strpos($body,$val,$target_pos);
 115             if (is_int($enda) && $enda < $end)
 116               $end = $enda;
 117           }
 118
 119           // Extract URL
 120           $url = substr($body, $target_pos, $end-$target_pos);
 121
 122           // Replace URL with HyperLinked Url, requires 1 char in link
 123           if ($url != '' && $url != $target_token)
 124           {
 125             $url_str = "<a href=\"$url\" target=\"_blank\">$url</a>";
 126             replaceBlock($body,$url_str,$target_pos,$end);
 127             $target_pos += strlen($url_str);
 128           }
 129           else
 130           {
 131              // Not quite a valid link, skip ahead to next chance
 132              $target_pos += strlen($target_token);
 133           }
 134         }
 135
 136         // Move forward
 137         $start = $target_pos;
 138         $target_pos = strlen($body);
 139       }
 140    }
 141
 142 ?>