functions/strings.php

   1 <?php
   2
   3 /**
   4  * strings.php
   5  *
   6  * Copyright (c) 1999-2004 The SquirrelMail Project Team
   7  * Licensed under the GNU GPL. For full terms see the file COPYING.
   8  *
   9  * This code provides various string manipulation functions that are
  10  * used by the rest of the Squirrelmail code.
  11  *
  12  * $Id$
  13  * @package squirrelmail
  14  */
  15
  16 /**
  17  * SquirrelMail version number -- DO NOT CHANGE
  18  */
  19 global $version;
  20 $version = '1.5.1 [CVS]';
  21
  22 /**
  23  * SquirrelMail internal version number -- DO NOT CHANGE
  24  * $sm_internal_version = array (release, major, minor)
  25  */
  26 global $SQM_INTERNAL_VERSION;
  27 $SQM_INTERNAL_VERSION = array(1,5,1);
  28
  29 /**
  30  * There can be a circular issue with includes, where the $version string is
  31  * referenced by the include of global.php, etc. before it's defined.
  32  * For that reason, bring in global.php AFTER we define the version strings.
  33  */
  34 require_once(SM_PATH . 'functions/global.php');
  35
  36 /**
  37  * Wraps text at $wrap characters
  38  *
  39  * Has a problem with special HTML characters, so call this before
  40  * you do character translation.
  41  *
  42  * Specifically, &#039 comes up as 5 characters instead of 1.
  43  * This should not add newlines to the end of lines.
  44  *
  45  * @param string line the line of text to wrap, by ref
  46  * @param int wrap the maximum line lenth
  47  * @return void
  48  */
  49 function sqWordWrap(&$line, $wrap) {
  50     global $languages, $squirrelmail_language;
  51
  52     if (isset($languages[$squirrelmail_language]['XTRA_CODE']) &&
  53         function_exists($languages[$squirrelmail_language]['XTRA_CODE'])) {
  54         if (mb_detect_encoding($line) != 'ASCII') {
  55             $line = $languages[$squirrelmail_language]['XTRA_CODE']('wordwrap', $line, $wrap);
  56             return;
  57         }
  58     }
  59
  60     ereg("^([\t >]*)([^\t >].*)?$", $line, $regs);
  61     $beginning_spaces = $regs[1];
  62     if (isset($regs[2])) {
  63         $words = explode(' ', $regs[2]);
  64     } else {
  65         $words = '';
  66     }
  67
  68     $i = 0;
  69     $line = $beginning_spaces;
  70
  71     while ($i < count($words)) {
  72         /* Force one word to be on a line (minimum) */
  73         $line .= $words[$i];
  74         $line_len = strlen($beginning_spaces) + strlen($words[$i]) + 2;
  75         if (isset($words[$i + 1]))
  76             $line_len += strlen($words[$i + 1]);
  77         $i ++;
  78
  79         /* Add more words (as long as they fit) */
  80         while ($line_len < $wrap && $i < count($words)) {
  81             $line .= ' ' . $words[$i];
  82             $i++;
  83             if (isset($words[$i]))
  84                 $line_len += strlen($words[$i]) + 1;
  85             else
  86                 $line_len += 1;
  87         }
  88
  89         /* Skip spaces if they are the first thing on a continued line */
  90         while (!isset($words[$i]) && $i < count($words)) {
  91             $i ++;
  92         }
  93
  94         /* Go to the next line if we have more to process */
  95         if ($i < count($words)) {
  96             $line .= "\n";
  97         }
  98     }
  99 }
 100
 101 /**
 102  * Does the opposite of sqWordWrap()
 103  * @param string body the text to un-wordwrap
 104  * @return void
 105  */
 106 function sqUnWordWrap(&$body) {
 107     global $squirrelmail_language;
 108
 109     if ($squirrelmail_language == 'ja_JP') {
 110         return;
 111     }
 112
 113     $lines = explode("\n", $body);
 114     $body = '';
 115     $PreviousSpaces = '';
 116     $cnt = count($lines);
 117     for ($i = 0; $i < $cnt; $i ++) {
 118         preg_match("/^([\t >]*)([^\t >].*)?$/", $lines[$i], $regs);
 119         $CurrentSpaces = $regs[1];
 120         if (isset($regs[2])) {
 121             $CurrentRest = $regs[2];
 122         } else {
 123             $CurrentRest = '';
 124         }
 125
 126         if ($i == 0) {
 127             $PreviousSpaces = $CurrentSpaces;
 128             $body = $lines[$i];
 129         } else if (($PreviousSpaces == $CurrentSpaces) /* Do the beginnings match */
 130                    && (strlen($lines[$i - 1]) > 65)    /* Over 65 characters long */
 131                    && strlen($CurrentRest)) {          /* and there's a line to continue with */
 132             $body .= ' ' . $CurrentRest;
 133         } else {
 134             $body .= "\n" . $lines[$i];
 135             $PreviousSpaces = $CurrentSpaces;
 136         }
 137     }
 138     $body .= "\n";
 139 }
 140
 141 /**
 142  * If $haystack is a full mailbox name and $needle is the mailbox
 143  * separator character, returns the last part of the mailbox name.
 144  *
 145  * @param string haystack full mailbox name to search
 146  * @param string needle the mailbox separator character
 147  * @return string the last part of the mailbox name
 148  */
 149 function readShortMailboxName($haystack, $needle) {
 150
 151     if ($needle == '') {
 152         $elem = $haystack;
 153     } else {
 154         $parts = explode($needle, $haystack);
 155         $elem = array_pop($parts);
 156         while ($elem == '' && count($parts)) {
 157             $elem = array_pop($parts);
 158         }
 159     }
 160     return( $elem );
 161 }
 162
 163 /**
 164  * Creates an URL for the page calling this function, using either the PHP global
 165  * REQUEST_URI, or the PHP global PHP_SELF with QUERY_STRING added.
 166  *
 167  * @return string the complete url for this page
 168  */
 169 function php_self () {
 170     if ( sqgetGlobalVar('REQUEST_URI', $req_uri, SQ_SERVER) && !empty($req_uri) ) {
 171       return $req_uri;
 172     }
 173
 174     if ( sqgetGlobalVar('PHP_SELF', $php_self, SQ_SERVER) && !empty($php_self) ) {
 175
 176       // need to add query string to end of PHP_SELF to match REQUEST_URI
 177       //
 178       if ( sqgetGlobalVar('QUERY_STRING', $query_string, SQ_SERVER) && !empty($query_string) ) {
 179          $php_self .= '?' . $query_string;
 180       }
 181
 182       return $php_self;
 183     }
 184
 185     return '';
 186 }
 187
 188
 189 /**
 190  * Determines the location to forward to, relative to your server.
 191  * This is used in HTTP Location: redirects.
 192  * If this doesnt work correctly for you (although it should), you can
 193  * remove all this code except the last two lines, and have it return
 194  * the right URL for your site, something like:
 195  *
 196  *   http://www.example.com/squirrelmail/
 197  *
 198  * @return string the base url for this SquirrelMail installation
 199  */
 200 function get_location () {
 201
 202     global $imap_server_type;
 203
 204     /* Get the path, handle virtual directories */
 205     if(strpos(php_self(), '?')) {
 206         $path = substr(php_self(), 0, strpos(php_self(), '?'));
 207     } else {
 208         $path = php_self();
 209     }
 210     $path = substr($path, 0, strrpos($path, '/'));
 211     if ( sqgetGlobalVar('sq_base_url', $full_url, SQ_SESSION) ) {
 212       return $full_url . $path;
 213     }
 214
 215     /* Check if this is a HTTPS or regular HTTP request. */
 216     $proto = 'http://';
 217
 218     /*
 219      * If you have 'SSLOptions +StdEnvVars' in your apache config
 220      *     OR if you have HTTPS=on in your HTTP_SERVER_VARS
 221      *     OR if you are on port 443
 222      */
 223     $getEnvVar = getenv('HTTPS');
 224     if ((isset($getEnvVar) && !strcasecmp($getEnvVar, 'on')) ||
 225         (sqgetGlobalVar('HTTPS', $https_on, SQ_SERVER) && !strcasecmp($https_on, 'on')) ||
 226         (sqgetGlobalVar('SERVER_PORT', $server_port, SQ_SERVER) &&  $server_port == 443)) {
 227         $proto = 'https://';
 228     }
 229
 230     /* Get the hostname from the Host header or server config. */
 231     if ( !sqgetGlobalVar('HTTP_HOST', $host, SQ_SERVER) || empty($host) ) {
 232       if ( !sqgetGlobalVar('SERVER_NAME', $host, SQ_SERVER) || empty($host) ) {
 233         $host = '';
 234       }
 235     }
 236
 237     $port = '';
 238     if (! strstr($host, ':')) {
 239         if (sqgetGlobalVar('SERVER_PORT', $server_port, SQ_SERVER)) {
 240             if (($server_port != 80 && $proto == 'http://') ||
 241                 ($server_port != 443 && $proto == 'https://')) {
 242                 $port = sprintf(':%d', $server_port);
 243             }
 244         }
 245     }
 246
 247    /* this is a workaround for the weird macosx caching that
 248       causes Apache to return 16080 as the port number, which causes
 249       SM to bail */
 250
 251    if ($imap_server_type == 'macosx' && $port == ':16080') {
 252         $port = '';
 253    }
 254
 255    /* Fallback is to omit the server name and use a relative */
 256    /* URI, although this is not RFC 2616 compliant.          */
 257    $full_url = ($host ? $proto . $host . $port : '');
 258    sqsession_register($full_url, 'sq_base_url');
 259    return $full_url . $path;
 260 }
 261
 262
 263 /**
 264  * These functions are used to encrypt the password before it is
 265  * stored in a cookie. The encryption key is generated by
 266  * OneTimePadCreate();
 267  *
 268  * @param string string the (password)string to encrypt
 269  * @param string epad the encryption key
 270  * @return string the base64-encoded encrypted password
 271  */
 272 function OneTimePadEncrypt ($string, $epad) {
 273     $pad = base64_decode($epad);
 274     $encrypted = '';
 275     for ($i = 0; $i < strlen ($string); $i++) {
 276         $encrypted .= chr (ord($string[$i]) ^ ord($pad[$i]));
 277     }
 278
 279     return base64_encode($encrypted);
 280 }
 281
 282 /**
 283  * Decrypt a password from the cookie, encrypted by OneTimePadEncrypt.
 284  * This uses the encryption key that is stored in the session.
 285  *
 286  * @param string string the string to decrypt
 287  * @param string epad the encryption key from the session
 288  * @return string the decrypted password
 289  */
 290 function OneTimePadDecrypt ($string, $epad) {
 291     $pad = base64_decode($epad);
 292     $encrypted = base64_decode ($string);
 293     $decrypted = '';
 294     for ($i = 0; $i < strlen ($encrypted); $i++) {
 295         $decrypted .= chr (ord($encrypted[$i]) ^ ord($pad[$i]));
 296     }
 297
 298     return $decrypted;
 299 }
 300
 301
 302 /**
 303  * Randomize the mt_rand() function.  Toss this in strings or integers
 304  * and it will seed the generator appropriately. With strings, it is
 305  * better to get them long. Use md5() to lengthen smaller strings.
 306  *
 307  * @param mixed val a value to seed the random number generator
 308  * @return void
 309  */
 310 function sq_mt_seed($Val) {
 311     /* if mt_getrandmax() does not return a 2^n - 1 number,
 312        this might not work well.  This uses $Max as a bitmask. */
 313     $Max = mt_getrandmax();
 314
 315     if (! is_int($Val)) {
 316             $Val = crc32($Val);
 317     }
 318
 319     if ($Val < 0) {
 320         $Val *= -1;
 321     }
 322
 323     if ($Val = 0) {
 324         return;
 325     }
 326
 327     mt_srand(($Val ^ mt_rand(0, $Max)) & $Max);
 328 }
 329
 330
 331 /**
 332  * This function initializes the random number generator fairly well.
 333  * It also only initializes it once, so you don't accidentally get
 334  * the same 'random' numbers twice in one session.
 335  *
 336  * @return void
 337  */
 338 function sq_mt_randomize() {
 339     static $randomized;
 340
 341     if ($randomized) {
 342         return;
 343     }
 344
 345     /* Global. */
 346     sqgetGlobalVar('REMOTE_PORT', $remote_port, SQ_SERVER);
 347     sqgetGlobalVar('REMOTE_ADDR', $remote_addr, SQ_SERVER);
 348     sq_mt_seed((int)((double) microtime() * 1000000));
 349     sq_mt_seed(md5($remote_port . $remote_addr . getmypid()));
 350
 351     /* getrusage */
 352     if (function_exists('getrusage')) {
 353         /* Avoid warnings with Win32 */
 354         $dat = @getrusage();
 355         if (isset($dat) && is_array($dat)) {
 356             $Str = '';
 357             foreach ($dat as $k => $v)
 358                 {
 359                     $Str .= $k . $v;
 360                 }
 361             sq_mt_seed(md5($Str));
 362         }
 363     }
 364
 365     if(sqgetGlobalVar('UNIQUE_ID', $unique_id, SQ_SERVER)) {
 366         sq_mt_seed(md5($unique_id));
 367     }
 368
 369     $randomized = 1;
 370 }
 371
 372 /**
 373  * Creates an encryption key for encrypting the password stored in the cookie.
 374  * The encryption key itself is stored in the session.
 375  *
 376  * @param int length optional, length of the string to generate
 377  * @return string the encryption key
 378  */
 379 function OneTimePadCreate ($length=100) {
 380     sq_mt_randomize();
 381
 382     $pad = '';
 383     for ($i = 0; $i < $length; $i++) {
 384         $pad .= chr(mt_rand(0,255));
 385     }
 386
 387     return base64_encode($pad);
 388 }
 389
 390 /**
 391  * Returns a string showing the size of the message/attachment.
 392  *
 393  * @param int bytes the filesize in bytes
 394  * @return string the filesize in human readable format
 395  */
 396 function show_readable_size($bytes) {
 397     $bytes /= 1024;
 398     $type = 'k';
 399
 400     if ($bytes / 1024 > 1) {
 401         $bytes /= 1024;
 402         $type = 'M';
 403     }
 404
 405     if ($bytes < 10) {
 406         $bytes *= 10;
 407         settype($bytes, 'integer');
 408         $bytes /= 10;
 409     } else {
 410         settype($bytes, 'integer');
 411     }
 412
 413     return $bytes . '<small>&nbsp;' . $type . '</small>';
 414 }
 415
 416 /**
 417  * Generates a random string from the caracter set you pass in
 418  *
 419  * @param int size the size of the string to generate
 420  * @param string chars a string containing the characters to use
 421  * @param int flags a flag to add a specific set to the characters to use:
 422  *     Flags:
 423  *       1 = add lowercase a-z to $chars
 424  *       2 = add uppercase A-Z to $chars
 425  *       4 = add numbers 0-9 to $chars
 426  * @return string the random string
 427  */
 428
 429 function GenerateRandomString($size, $chars, $flags = 0) {
 430     if ($flags & 0x1) {
 431         $chars .= 'abcdefghijklmnopqrstuvwxyz';
 432     }
 433     if ($flags & 0x2) {
 434         $chars .= 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
 435     }
 436     if ($flags & 0x4) {
 437         $chars .= '0123456789';
 438     }
 439
 440     if (($size < 1) || (strlen($chars) < 1)) {
 441         return '';
 442     }
 443
 444     sq_mt_randomize(); /* Initialize the random number generator */
 445
 446     $String = '';
 447     $j = strlen( $chars ) - 1;
 448     while (strlen($String) < $size) {
 449         $String .= $chars{mt_rand(0, $j)};
 450     }
 451
 452     return $String;
 453 }
 454
 455 /**
 456  * Escapes special characters for use in IMAP commands.
 457  * @param string the string to escape
 458  * @return string the escaped string
 459  */
 460 function quoteimap($str) {
 461     return preg_replace("/([\"\\\\])/", "\\\\$1", $str);
 462 }
 463
 464 /**
 465  * Trims every element in the array, ie. remove the first char of each element
 466  * @param array array the array to trim
 467  */
 468 function TrimArray(&$array) {
 469     foreach ($array as $k => $v) {
 470         global $$k;
 471         if (is_array($$k)) {
 472             foreach ($$k as $k2 => $v2) {
 473                 $$k[$k2] = substr($v2, 1);
 474             }
 475         } else {
 476             $$k = substr($v, 1);
 477         }
 478
 479         /* Re-assign back to array. */
 480         $array[$k] = $$k;
 481     }
 482 }
 483
 484 /**
 485  * Returns a link to the compose-page, taking in consideration
 486  * the compose_in_new and javascript settings.
 487  * @param string url the URL to the compose page
 488  * @param string text the link text, default "Compose"
 489  * @return string a link to the compose page
 490  */
 491 function makeComposeLink($url, $text = null, $target='')
 492 {
 493     global $compose_new_win,$javascript_on;
 494
 495     if(!$text) {
 496         $text = _("Compose");
 497     }
 498
 499
 500     // if not using "compose in new window", make
 501     // regular link and be done with it
 502     if($compose_new_win != '1') {
 503         return makeInternalLink($url, $text, $target);
 504     }
 505
 506
 507     // build the compose in new window link...
 508
 509
 510     // if javascript is on, use onClick event to handle it
 511     if($javascript_on) {
 512         sqgetGlobalVar('base_uri', $base_uri, SQ_SESSION);
 513         return '<a href="javascript:void(0)" onclick="comp_in_new(\''.$base_uri.$url.'\')">'. $text.'</a>';
 514     }
 515
 516
 517     // otherwise, just open new window using regular HTML
 518     return makeInternalLink($url, $text, '_blank');
 519
 520 }
 521
 522 /**
 523  * sm_print_r($some_variable, [$some_other_variable [, ...]]);
 524  * Debugging function - does the same as print_r, but makes sure special
 525  * characters are converted to htmlentities first.  This will allow
 526  * values like <some@email.address> to be displayed.
 527  * The output is wrapped in <pre> and </pre> tags.
 528  *
 529  * @return void
 530  */
 531 function sm_print_r() {
 532     ob_start();  // Buffer output
 533     foreach(func_get_args() as $var) {
 534         print_r($var);
 535         echo "\n";
 536     }
 537     $buffer = ob_get_contents(); // Grab the print_r output
 538     ob_end_clean();  // Silently discard the output & stop buffering
 539     print '<pre>';
 540     print htmlentities($buffer);
 541     print '</pre>';
 542 }
 543
 544 /**
 545  * version of fwrite which checks for failure
 546  */
 547 function sq_fwrite($fp, $string) {
 548         // write to file
 549         $count = @fwrite($fp,$string);
 550         // the number of bytes written should be the length of the string
 551         if($count != strlen($string)) {
 552                 return FALSE;
 553         }
 554
 555         return $count;
 556 }
 557
 558
 559
 560 $PHP_SELF = php_self();
 561 ?>