src/Protocol/Email.php

   1 <?php
   2 /**
   3  * @copyright Copyright (C) 2010-2021, the Friendica project
   4  *
   5  * @license GNU AGPL version 3 or any later version
   6  *
   7  * This program is free software: you can redistribute it and/or modify
   8  * it under the terms of the GNU Affero General Public License as
   9  * published by the Free Software Foundation, either version 3 of the
  10  * License, or (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU Affero General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Affero General Public License
  18  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  19  *
  20  */
  21
  22 namespace Friendica\Protocol;
  23
  24 use Friendica\Core\Hook;
  25 use Friendica\Core\Logger;
  26 use Friendica\Content\Text\BBCode;
  27 use Friendica\Content\Text\HTML;
  28 use Friendica\Model\Item;
  29 use Friendica\Util\Strings;
  30
  31 /**
  32  * Email class
  33  */
  34 class Email
  35 {
  36         /**
  37          * @param string $mailbox  The mailbox name
  38          * @param string $username The username
  39          * @param string $password The password
  40          * @return resource
  41          * @throws \Exception
  42          */
  43         public static function connect($mailbox, $username, $password)
  44         {
  45                 if (!function_exists('imap_open')) {
  46                         return false;
  47                 }
  48
  49                 $mbox = @imap_open($mailbox, $username, $password);
  50
  51                 $errors = imap_errors();
  52                 if (!empty($errors)) {
  53                         Logger::notice('IMAP Errors occured', ['errora' => $errors]);
  54                 }
  55
  56                 $alerts = imap_alerts();
  57                 if (!empty($alerts)) {
  58                         Logger::notice('IMAP Alerts occured: ', ['alerts' => $alerts]);
  59                 }
  60
  61                 return $mbox;
  62         }
  63
  64         /**
  65          * @param resource $mbox       mailbox
  66          * @param string   $email_addr email
  67          * @return array
  68          * @throws \Exception
  69          */
  70         public static function poll($mbox, $email_addr)
  71         {
  72                 if (!$mbox || !$email_addr) {
  73                         return [];
  74                 }
  75
  76                 $search1 = @imap_search($mbox, 'UNDELETED FROM "' . $email_addr . '"', SE_UID);
  77                 if (!$search1) {
  78                         $search1 = [];
  79                 } else {
  80                         Logger::notice("Found mails from ".$email_addr);
  81                 }
  82
  83                 $search2 = @imap_search($mbox, 'UNDELETED TO "' . $email_addr . '"', SE_UID);
  84                 if (!$search2) {
  85                         $search2 = [];
  86                 } else {
  87                         Logger::notice("Found mails to ".$email_addr);
  88                 }
  89
  90                 $search3 = @imap_search($mbox, 'UNDELETED CC "' . $email_addr . '"', SE_UID);
  91                 if (!$search3) {
  92                         $search3 = [];
  93                 } else {
  94                         Logger::notice("Found mails cc ".$email_addr);
  95                 }
  96
  97                 $res = array_unique(array_merge($search1, $search2, $search3));
  98
  99                 return $res;
 100         }
 101
 102         /**
 103          * @param array   $mailacct mail account
 104          * @return string
 105          */
 106         public static function constructMailboxName($mailacct)
 107         {
 108                 $ret = '{' . $mailacct['server'] . ((intval($mailacct['port'])) ? ':' . $mailacct['port'] : '');
 109                 $ret .= (($mailacct['ssltype']) ?  '/' . $mailacct['ssltype'] . '/novalidate-cert' : '');
 110                 $ret .= '}' . $mailacct['mailbox'];
 111                 return $ret;
 112         }
 113
 114         /**
 115          * @param resource $mbox mailbox
 116          * @param integer  $uid  user id
 117          * @return mixed
 118          */
 119         public static function messageMeta($mbox, $uid)
 120         {
 121                 $ret = (($mbox && $uid) ? @imap_fetch_overview($mbox, $uid, FT_UID) : [[]]); // POSSIBLE CLEANUP --> array(array()) is probably redundant now
 122                 return (count($ret)) ? $ret : [];
 123         }
 124
 125         /**
 126          * @param resource $mbox  mailbox
 127          * @param integer  $uid   user id
 128          * @param string   $reply reply
 129          * @return array
 130          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 131          */
 132         public static function getMessage($mbox, $uid, $reply, $item)
 133         {
 134                 $ret = $item;
 135
 136                 $struc = (($mbox && $uid) ? @imap_fetchstructure($mbox, $uid, FT_UID) : null);
 137
 138                 if (!$struc) {
 139                         Logger::notice("IMAP structure couldn't be fetched", ['uid' => $uid]);
 140                         return $ret;
 141                 }
 142
 143                 if (empty($struc->parts)) {
 144                         $html = trim(self::messageGetPart($mbox, $uid, $struc, 0, 'html'));
 145
 146                         if (!empty($html)) {
 147                                 $message = ['text' => '', 'html' => $html, 'item' => $ret];
 148                                 Hook::callAll('email_getmessage', $message);
 149                                 $ret = $message['item'];
 150                                 if (empty($ret['body'])) {
 151                                         $ret['body'] = HTML::toBBCode($message['html']);
 152                                 }
 153                         }
 154
 155                         if (empty($ret['body'])) {
 156                                 $text = self::messageGetPart($mbox, $uid, $struc, 0, 'plain');
 157
 158                                 $message = ['text' => $text, 'html' => '', 'item' => $ret];
 159                                 Hook::callAll('email_getmessage', $message);
 160                                 $ret = $message['item'];
 161                                 $ret['body'] = $message['text'];
 162                         }
 163                 } else {
 164                         $text = '';
 165                         $html = '';
 166                         foreach ($struc->parts as $ptop => $p) {
 167                                 $x = self::messageGetPart($mbox, $uid, $p, $ptop + 1, 'plain');
 168                                 if ($x) {
 169                                         $text .= $x;
 170                                 }
 171
 172                                 $x = self::messageGetPart($mbox, $uid, $p, $ptop + 1, 'html');
 173                                 if ($x) {
 174                                         $html .= $x;
 175                                 }
 176                         }
 177
 178                         $message = ['text' => trim($text), 'html' => trim($html), 'item' => $ret];
 179                         Hook::callAll('email_getmessage', $message);
 180                         $ret = $message['item'];
 181
 182                         if (empty($ret['body']) && !empty($message['html'])) {
 183                                 $ret['body'] = HTML::toBBCode($message['html']);
 184                         }
 185
 186                         if (empty($ret['body'])) {
 187                                 $ret['body'] = $message['text'];
 188                         }
 189                 }
 190
 191                 $ret['body'] = self::removeGPG($ret['body']);
 192                 $msg = self::removeSig($ret['body']);
 193                 $ret['body'] = $msg['body'];
 194                 $ret['body'] = self::convertQuote($ret['body'], $reply);
 195
 196                 if (trim($html) != '') {
 197                         $ret['body'] = self::removeLinebreak($ret['body']);
 198                 }
 199
 200                 $ret['body'] = self::unifyAttributionLine($ret['body']);
 201
 202                 $ret['body'] = Strings::escapeHtml($ret['body']);
 203                 $ret['body'] = BBCode::limitBodySize($ret['body']);
 204
 205                 Hook::callAll('email_getmessage_end', $ret);
 206
 207                 return $ret;
 208         }
 209
 210         /**
 211          * fetch the specified message part number with the specified subtype
 212          *
 213          * @param resource $mbox    mailbox
 214          * @param integer  $uid     user id
 215          * @param object   $p       parts
 216          * @param integer  $partno  part number
 217          * @param string   $subtype sub type
 218          * @return string
 219          */
 220         private static function messageGetPart($mbox, $uid, $p, $partno, $subtype)
 221         {
 222                 // $partno = '1', '2', '2.1', '2.1.3', etc for multipart, 0 if simple
 223                 global $htmlmsg,$plainmsg,$charset,$attachments;
 224
 225                 // DECODE DATA
 226                 $data = ($partno)
 227                         ? @imap_fetchbody($mbox, $uid, $partno, FT_UID|FT_PEEK)
 228                 : @imap_body($mbox, $uid, FT_UID|FT_PEEK);
 229
 230                 // Any part may be encoded, even plain text messages, so check everything.
 231                 if ($p->encoding == 4) {
 232                         $data = quoted_printable_decode($data);
 233                 } elseif ($p->encoding == 3) {
 234                         $data = base64_decode($data);
 235                 }
 236
 237                 // PARAMETERS
 238                 // get all parameters, like charset, filenames of attachments, etc.
 239                 $params = [];
 240                 if ($p->parameters) {
 241                         foreach ($p->parameters as $x) {
 242                                 $params[strtolower($x->attribute)] = $x->value;
 243                         }
 244                 }
 245
 246                 if (isset($p->dparameters) && $p->dparameters) {
 247                         foreach ($p->dparameters as $x) {
 248                                 $params[strtolower($x->attribute)] = $x->value;
 249                         }
 250                 }
 251
 252                 // ATTACHMENT
 253                 // Any part with a filename is an attachment,
 254                 // so an attached text file (type 0) is not mistaken as the message.
 255
 256                 if ((isset($params['filename']) && $params['filename']) || (isset($params['name']) && $params['name'])) {
 257                         // filename may be given as 'Filename' or 'Name' or both
 258                         $filename = ($params['filename'])? $params['filename'] : $params['name'];
 259                         // filename may be encoded, so see imap_mime_header_decode()
 260                         $attachments[$filename] = $data;  // this is a problem if two files have same name
 261                 }
 262
 263                 // TEXT
 264                 if ($p->type == 0 && $data) {
 265                         // Messages may be split in different parts because of inline attachments,
 266                         // so append parts together with blank row.
 267                         if (strtolower($p->subtype)==$subtype) {
 268                                 $data = iconv($params['charset'], 'UTF-8//IGNORE', $data);
 269                                 return (trim($data) ."\n\n");
 270                         } else {
 271                                 $data = '';
 272                         }
 273
 274                         // $htmlmsg .= $data ."<br><br>";
 275                         $charset = $params['charset'];  // assume all parts are same charset
 276                 }
 277
 278                 // EMBEDDED MESSAGE
 279                 // Many bounce notifications embed the original message as type 2,
 280                 // but AOL uses type 1 (multipart), which is not handled here.
 281                 // There are no PHP functions to parse embedded messages,
 282                 // so this just appends the raw source to the main message.
 283                 //      elseif ($p->type==2 && $data) {
 284                 //              $plainmsg .= $data."\n\n";
 285                 //      }
 286
 287                 // SUBPART RECURSION
 288                 if (isset($p->parts) && $p->parts) {
 289                         $x = "";
 290                         foreach ($p->parts as $partno0 => $p2) {
 291                                 $x .=  self::messageGetPart($mbox, $uid, $p2, $partno . '.' . ($partno0+1), $subtype);  // 1.2, 1.2.1, etc.
 292                         }
 293                         return $x;
 294                 }
 295         }
 296
 297         /**
 298          * @param string $in_str  in string
 299          * @param string $charset character set
 300          * @return string
 301          */
 302         public static function encodeHeader($in_str, $charset)
 303         {
 304                 $out_str = $in_str;
 305                 $need_to_convert = false;
 306
 307                 for ($x = 0; $x < strlen($in_str); $x ++) {
 308                         if ((ord($in_str[$x]) == 0) || ((ord($in_str[$x]) > 128))) {
 309                                 $need_to_convert = true;
 310                         }
 311                 }
 312
 313                 if (!$need_to_convert) {
 314                         return $in_str;
 315                 }
 316
 317                 if ($out_str && $charset) {
 318                         // define start delimimter, end delimiter and spacer
 319                         $end = "?=";
 320                         $start = "=?" . $charset . "?B?";
 321                         $spacer = $end . "\r\n " . $start;
 322
 323                         // determine length of encoded text within chunks
 324                         // and ensure length is even
 325                         $length = 75 - strlen($start) - strlen($end);
 326
 327                         /*
 328                                 [EDIT BY danbrown AT php DOT net: The following
 329                                 is a bugfix provided by (gardan AT gmx DOT de)
 330                                 on 31-MAR-2005 with the following note:
 331                                 "This means: $length should not be even,
 332                                 but divisible by 4. The reason is that in
 333                                 base64-encoding 3 8-bit-chars are represented
 334                                 by 4 6-bit-chars. These 4 chars must not be
 335                                 split between two encoded words, according
 336                                 to RFC-2047.
 337                         */
 338                         $length = $length - ($length % 4);
 339
 340                         // encode the string and split it into chunks
 341                         // with spacers after each chunk
 342                         $out_str = base64_encode($out_str);
 343                         $out_str = chunk_split($out_str, $length, $spacer);
 344
 345                         // remove trailing spacer and
 346                         // add start and end delimiters
 347                         $spacer = preg_quote($spacer, '/');
 348                         $out_str = preg_replace("/" . $spacer . "$/", "", $out_str);
 349                         $out_str = $start . $out_str . $end;
 350                 }
 351                 return $out_str;
 352         }
 353
 354         /**
 355          * Function send is used by Protocol::EMAIL code
 356          * (not to notify the user, but to send items to email contacts)
 357          *
 358          * @param string $addr    address
 359          * @param string $subject subject
 360          * @param string $headers headers
 361          * @param array  $item    item
 362          *
 363          * @return void
 364          *
 365          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 366          * @throws \ImagickException
 367          * @todo This could be changed to use the Emailer class
 368          */
 369         public static function send($addr, $subject, $headers, $item)
 370         {
 371                 //$headers .= 'MIME-Version: 1.0' . "\n";
 372                 //$headers .= 'Content-Type: text/html; charset=UTF-8' . "\n";
 373                 //$headers .= 'Content-Type: text/plain; charset=UTF-8' . "\n";
 374                 //$headers .= 'Content-Transfer-Encoding: 8bit' . "\n\n";
 375
 376                 $part = uniqid("", true);
 377
 378                 $html    = Item::prepareBody($item);
 379
 380                 $headers .= "Mime-Version: 1.0\n";
 381                 $headers .= 'Content-Type: multipart/alternative; boundary="=_'.$part.'"'."\n\n";
 382
 383                 $body = "\n--=_".$part."\n";
 384                 $body .= "Content-Transfer-Encoding: 8bit\n";
 385                 $body .= "Content-Type: text/plain; charset=utf-8; format=flowed\n\n";
 386
 387                 $body .= HTML::toPlaintext($html)."\n";
 388
 389                 $body .= "--=_".$part."\n";
 390                 $body .= "Content-Transfer-Encoding: 8bit\n";
 391                 $body .= "Content-Type: text/html; charset=utf-8\n\n";
 392
 393                 $body .= '<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">'.$html."</body></html>\n";
 394
 395                 $body .= "--=_".$part."--";
 396
 397                 //$message = '<html><body>' . $html . '</body></html>';
 398                 //$message = html2plain($html);
 399                 Logger::notice('notifier: email delivery to ' . $addr);
 400                 mail($addr, $subject, $body, $headers);
 401         }
 402
 403         /**
 404          * @param string $iri string
 405          * @return string
 406          */
 407         public static function iri2msgid($iri)
 408         {
 409                 if (!strpos($iri, "@")) {
 410                         $msgid = preg_replace("/urn:(\S+):(\S+)\.(\S+):(\d+):(\S+)/i", "urn!$1!$4!$5@$2.$3", $iri);
 411                 } else {
 412                         $msgid = $iri;
 413                 }
 414
 415                 return $msgid;
 416         }
 417
 418         /**
 419          * @param string $msgid msgid
 420          * @return string
 421          */
 422         public static function msgid2iri($msgid)
 423         {
 424                 if (strpos($msgid, "@")) {
 425                         $iri = preg_replace("/urn!(\S+)!(\d+)!(\S+)@(\S+)\.(\S+)/i", "urn:$1:$4.$5:$2:$3", $msgid);
 426                 } else {
 427                         $iri = $msgid;
 428                 }
 429
 430                 return $iri;
 431         }
 432
 433         private static function saveReplace($pattern, $replace, $text)
 434         {
 435                 $save = $text;
 436
 437                 $text = preg_replace($pattern, $replace, $text);
 438
 439                 if ($text == '') {
 440                         $text = $save;
 441                 }
 442                 return $text;
 443         }
 444
 445         private static function unifyAttributionLine($message)
 446         {
 447                 $quotestr = ['quote', 'spoiler'];
 448                 foreach ($quotestr as $quote) {
 449                         $message = self::saveReplace('/----- Original Message -----\s.*?From: "([^<"].*?)" <(.*?)>\s.*?To: (.*?)\s*?Cc: (.*?)\s*?Sent: (.*?)\s.*?Subject: ([^\n].*)\s*\['.$quote.'\]/i', "[".$quote."='$1']\n", $message);
 450                         $message = self::saveReplace('/----- Original Message -----\s.*?From: "([^<"].*?)" <(.*?)>\s.*?To: (.*?)\s*?Sent: (.*?)\s.*?Subject: ([^\n].*)\s*\['.$quote.'\]/i', "[".$quote."='$1']\n", $message);
 451
 452                         $message = self::saveReplace('/-------- Original-Nachricht --------\s*\['.$quote.'\]\nDatum: (.*?)\nVon: (.*?) <(.*?)>\nAn: (.*?)\nBetreff: (.*?)\n/i', "[".$quote."='$2']\n", $message);
 453                         $message = self::saveReplace('/-------- Original-Nachricht --------\s*\['.$quote.'\]\sDatum: (.*?)\s.*Von: "([^<"].*?)" <(.*?)>\s.*An: (.*?)\n.*/i', "[".$quote."='$2']\n", $message);
 454                         $message = self::saveReplace('/-------- Original-Nachricht --------\s*\['.$quote.'\]\nDatum: (.*?)\nVon: (.*?)\nAn: (.*?)\nBetreff: (.*?)\n/i', "[".$quote."='$2']\n", $message);
 455
 456                         $message = self::saveReplace('/-----Urspr.*?ngliche Nachricht-----\sVon: "([^<"].*?)" <(.*?)>\s.*Gesendet: (.*?)\s.*An: (.*?)\s.*Betreff: ([^\n].*?).*:\s*\['.$quote.'\]/i', "[".$quote."='$1']\n", $message);
 457                         $message = self::saveReplace('/-----Urspr.*?ngliche Nachricht-----\sVon: "([^<"].*?)" <(.*?)>\s.*Gesendet: (.*?)\s.*An: (.*?)\s.*Betreff: ([^\n].*?)\s*\['.$quote.'\]/i', "[".$quote."='$1']\n", $message);
 458
 459                         $message = self::saveReplace('/Am (.*?), schrieb (.*?):\s*\['.$quote.'\]/i', "[".$quote."='$2']\n", $message);
 460
 461                         $message = self::saveReplace('/Am .*?, \d+ .*? \d+ \d+:\d+:\d+ \+\d+\sschrieb\s(.*?)\s<(.*?)>:\s*\['.$quote.'\]/i', "[".$quote."='$1']\n", $message);
 462
 463                         $message = self::saveReplace('/Am (.*?) schrieb (.*?) <(.*?)>:\s*\['.$quote.'\]/i', "[".$quote."='$2']\n", $message);
 464                         $message = self::saveReplace('/Am (.*?) schrieb <(.*?)>:\s*\['.$quote.'\]/i', "[".$quote."='$2']\n", $message);
 465                         $message = self::saveReplace('/Am (.*?) schrieb (.*?):\s*\['.$quote.'\]/i', "[".$quote."='$2']\n", $message);
 466                         $message = self::saveReplace('/Am (.*?) schrieb (.*?)\n(.*?):\s*\['.$quote.'\]/i', "[".$quote."='$2']\n", $message);
 467
 468                         $message = self::saveReplace('/(\d+)\/(\d+)\/(\d+) ([^<"].*?) <(.*?)>\s*\['.$quote.'\]/i', "[".$quote."='$4']\n", $message);
 469
 470                         $message = self::saveReplace('/On .*?, \d+ .*? \d+ \d+:\d+:\d+ \+\d+\s(.*?)\s<(.*?)>\swrote:\s*\['.$quote.'\]/i', "[".$quote."='$1']\n", $message);
 471
 472                         $message = self::saveReplace('/On (.*?) at (.*?), (.*?)\s<(.*?)>\swrote:\s*\['.$quote.'\]/i', "[".$quote."='$3']\n", $message);
 473                         $message = self::saveReplace('/On (.*?)\n([^<].*?)\s<(.*?)>\swrote:\s*\['.$quote.'\]/i', "[".$quote."='$2']\n", $message);
 474                         $message = self::saveReplace('/On (.*?), (.*?), (.*?)\s<(.*?)>\swrote:\s*\['.$quote.'\]/i', "[".$quote."='$3']\n", $message);
 475                         $message = self::saveReplace('/On ([^,].*?), (.*?)\swrote:\s*\['.$quote.'\]/i', "[".$quote."='$2']\n", $message);
 476                         $message = self::saveReplace('/On (.*?), (.*?)\swrote\s*\['.$quote.'\]/i', "[".$quote."='$2']\n", $message);
 477
 478                         // Der loescht manchmal den Body - was eigentlich unmoeglich ist
 479                         $message = self::saveReplace('/On (.*?),(.*?),(.*?),(.*?), (.*?) wrote:\s*\['.$quote.'\]/i', "[".$quote."='$5']\n", $message);
 480
 481                         $message = self::saveReplace('/Zitat von ([^<].*?) <(.*?)>:\s*\['.$quote.'\]/i', "[".$quote."='$1']\n", $message);
 482
 483                         $message = self::saveReplace('/Quoting ([^<].*?) <(.*?)>:\s*\['.$quote.'\]/i', "[".$quote."='$1']\n", $message);
 484
 485                         $message = self::saveReplace('/From: "([^<"].*?)" <(.*?)>\s*\['.$quote.'\]/i', "[".$quote."='$1']\n", $message);
 486                         $message = self::saveReplace('/From: <(.*?)>\s*\['.$quote.'\]/i', "[".$quote."='$1']\n", $message);
 487
 488                         $message = self::saveReplace('/Du \(([^)].*?)\) schreibst:\s*\['.$quote.'\]/i', "[".$quote."='$1']\n", $message);
 489
 490                         $message = self::saveReplace('/--- (.*?) <.*?> schrieb am (.*?):\s*\['.$quote.'\]/i', "[".$quote."='$1']\n", $message);
 491                         $message = self::saveReplace('/--- (.*?) schrieb am (.*?):\s*\['.$quote.'\]/i', "[".$quote."='$1']\n", $message);
 492
 493                         $message = self::saveReplace('/\* (.*?) <(.*?)> hat geschrieben:\s*\['.$quote.'\]/i', "[".$quote."='$1']\n", $message);
 494
 495                         $message = self::saveReplace('/(.*?) <(.*?)> schrieb (.*?)\):\s*\['.$quote.'\]/i', "[".$quote."='$1']\n", $message);
 496                         $message = self::saveReplace('/(.*?) <(.*?)> schrieb am (.*?) um (.*):\s*\['.$quote.'\]/i', "[".$quote."='$1']\n", $message);
 497                         $message = self::saveReplace('/(.*?) schrieb am (.*?) um (.*):\s*\['.$quote.'\]/i', "[".$quote."='$1']\n", $message);
 498                         $message = self::saveReplace('/(.*?) \((.*?)\) schrieb:\s*\['.$quote.'\]/i', "[".$quote."='$2']\n", $message);
 499                         $message = self::saveReplace('/(.*?) schrieb:\s*\['.$quote.'\]/i', "[".$quote."='$1']\n", $message);
 500
 501                         $message = self::saveReplace('/(.*?) <(.*?)> writes:\s*\['.$quote.'\]/i', "[".$quote."='$1']\n", $message);
 502                         $message = self::saveReplace('/(.*?) \((.*?)\) writes:\s*\['.$quote.'\]/i', "[".$quote."='$2']\n", $message);
 503                         $message = self::saveReplace('/(.*?) writes:\s*\['.$quote.'\]/i', "[".$quote."='$1']\n", $message);
 504
 505                         $message = self::saveReplace('/\* (.*?) wrote:\s*\['.$quote.'\]/i', "[".$quote."='$1']\n", $message);
 506                         $message = self::saveReplace('/(.*?) wrote \(.*?\):\s*\['.$quote.'\]/i', "[".$quote."='$1']\n", $message);
 507                         $message = self::saveReplace('/(.*?) wrote:\s*\['.$quote.'\]/i', "[".$quote."='$1']\n", $message);
 508
 509                         $message = self::saveReplace('/([^<].*?) <.*?> hat am (.*?)\sum\s(.*)\sgeschrieben:\s*\['.$quote.'\]/i', "[".$quote."='$1']\n", $message);
 510
 511                         $message = self::saveReplace('/(\d+)\/(\d+)\/(\d+) ([^<"].*?) <(.*?)>:\s*\['.$quote.'\]/i', "[".$quote."='$4']\n", $message);
 512                         $message = self::saveReplace('/(\d+)\/(\d+)\/(\d+) (.*?) <(.*?)>\s*\['.$quote.'\]/i', "[".$quote."='$4']\n", $message);
 513                         $message = self::saveReplace('/(\d+)\/(\d+)\/(\d+) <(.*?)>:\s*\['.$quote.'\]/i', "[".$quote."='$4']\n", $message);
 514                         $message = self::saveReplace('/(\d+)\/(\d+)\/(\d+) <(.*?)>\s*\['.$quote.'\]/i', "[".$quote."='$4']\n", $message);
 515
 516                         $message = self::saveReplace('/(.*?) <(.*?)> schrubselte:\s*\['.$quote.'\]/i', "[".$quote."='$1']\n", $message);
 517                         $message = self::saveReplace('/(.*?) \((.*?)\) schrubselte:\s*\['.$quote.'\]/i', "[".$quote."='$2']\n", $message);
 518                 }
 519                 return $message;
 520         }
 521
 522         private static function removeGPG($message)
 523         {
 524                 $pattern = '/(.*)\s*-----BEGIN PGP SIGNED MESSAGE-----\s*[\r\n].*Hash:.*?[\r\n](.*)'.
 525                         '[\r\n]\s*-----BEGIN PGP SIGNATURE-----\s*[\r\n].*'.
 526                         '[\r\n]\s*-----END PGP SIGNATURE-----(.*)/is';
 527
 528                 if (preg_match($pattern, $message, $result)) {
 529                         $cleaned = trim($result[1].$result[2].$result[3]);
 530
 531                         $cleaned = str_replace(["\n- --\n", "\n- -"], ["\n-- \n", "\n-"], $cleaned);
 532                 } else {
 533                         $cleaned = $message;
 534                 }
 535
 536                 return $cleaned;
 537         }
 538
 539         private static function removeSig($message)
 540         {
 541                 $sigpos = strrpos($message, "\n-- \n");
 542                 $quotepos = strrpos($message, "[/quote]");
 543
 544                 if ($sigpos == 0) {
 545                         // Especially for web.de who are using that as a separator
 546                         $message = str_replace("\n___________________________________________________________\n", "\n-- \n", $message);
 547                         $sigpos = strrpos($message, "\n-- \n");
 548                         $quotepos = strrpos($message, "[/quote]");
 549                 }
 550
 551                 // When the signature separator is inside a quote, we don't separate
 552                 if (($sigpos < $quotepos) && ($sigpos != 0)) {
 553                         return ['body' => $message, 'sig' => ''];
 554                 }
 555
 556                 $pattern = '/(.*)[\r\n]-- [\r\n](.*)/is';
 557
 558                 preg_match($pattern, $message, $result);
 559
 560                 if (!empty($result[1]) && !empty($result[2])) {
 561                         $cleaned = trim($result[1])."\n";
 562                         $sig = trim($result[2]);
 563                 } else {
 564                         $cleaned = $message;
 565                         $sig = '';
 566                 }
 567
 568                 return ['body' => $cleaned, 'sig' => $sig];
 569         }
 570
 571         private static function removeLinebreak($message)
 572         {
 573                 $arrbody = explode("\n", trim($message));
 574
 575                 $lines = [];
 576                 $lineno = 0;
 577
 578                 foreach ($arrbody as $i => $line) {
 579                         $currquotelevel = 0;
 580                         $currline = $line;
 581                         while ((strlen($currline)>0) && ((substr($currline, 0, 1) == '>')
 582                                 || (substr($currline, 0, 1) == ' '))) {
 583                                 if (substr($currline, 0, 1) == '>') {
 584                                         $currquotelevel++;
 585                                 }
 586
 587                                 $currline = ltrim(substr($currline, 1));
 588                         }
 589
 590                         $quotelevel = 0;
 591                         $nextline = trim($arrbody[$i + 1] ?? '');
 592                         while ((strlen($nextline)>0) && ((substr($nextline, 0, 1) == '>')
 593                                 || (substr($nextline, 0, 1) == ' '))) {
 594                                 if (substr($nextline, 0, 1) == '>') {
 595                                         $quotelevel++;
 596                                 }
 597
 598                                 $nextline = ltrim(substr($nextline, 1));
 599                         }
 600
 601                         if (!empty($lines[$lineno])) {
 602                                 if (substr($lines[$lineno], -1) != ' ') {
 603                                         $lines[$lineno] .= ' ';
 604                                 }
 605
 606                                 while ((strlen($line)>0) && ((substr($line, 0, 1) == '>')
 607                                         || (substr($line, 0, 1) == ' '))) {
 608
 609                                         $line = ltrim(substr($line, 1));
 610                                 }
 611                         } else {
 612                                 $lines[$lineno] = '';
 613                         }
 614
 615                         $lines[$lineno] .= $line;
 616                         if (((substr($line, -1, 1) != ' '))
 617                                 || ($quotelevel != $currquotelevel)) {
 618                                 $lineno++;
 619                         }
 620                 }
 621                 return implode("\n", $lines);
 622         }
 623
 624         private static function convertQuote($body, $reply)
 625         {
 626                 // Convert Quotes
 627                 $arrbody = explode("\n", trim($body));
 628                 $arrlevel = [];
 629
 630                 for ($i = 0; $i < count($arrbody); $i++) {
 631                         $quotelevel = 0;
 632                         $quoteline = $arrbody[$i];
 633
 634                         while ((strlen($quoteline)>0) and ((substr($quoteline, 0, 1) == '>')
 635                                 || (substr($quoteline, 0, 1) == ' '))) {
 636                                 if (substr($quoteline, 0, 1) == '>')
 637                                         $quotelevel++;
 638
 639                                 $quoteline = ltrim(substr($quoteline, 1));
 640                         }
 641
 642                         $arrlevel[$i] = $quotelevel;
 643                         $arrbody[$i] = $quoteline;
 644                 }
 645
 646                 $quotelevel = 0;
 647                 $arrbodyquoted = [];
 648
 649                 for ($i = 0; $i < count($arrbody); $i++) {
 650                         $previousquote = $quotelevel;
 651                         $quotelevel = $arrlevel[$i];
 652
 653                         while ($previousquote < $quotelevel) {
 654                                 $quote = "[quote]";
 655                                 $arrbody[$i] = $quote.$arrbody[$i];
 656                                 $previousquote++;
 657                         }
 658
 659                         while ($previousquote > $quotelevel) {
 660                                 $arrbody[$i] = '[/quote]'.$arrbody[$i];
 661                                 $previousquote--;
 662                         }
 663
 664                         $arrbodyquoted[] = $arrbody[$i];
 665                 }
 666                 while ($quotelevel > 0) {
 667                         $arrbodyquoted[] = '[/quote]';
 668                         $quotelevel--;
 669                 }
 670
 671                 $body = implode("\n", $arrbodyquoted);
 672
 673                 if (strlen($body) > 0) {
 674                         $body = $body."\n\n";
 675                 }
 676
 677                 if ($reply) {
 678                         $body = self::removeToFu($body);
 679                 }
 680
 681                 return $body;
 682         }
 683
 684         private static function removeToFu($message)
 685         {
 686                 $message = trim($message);
 687
 688                 do {
 689                         $oldmessage = $message;
 690                         $message = preg_replace('=\[/quote\][\s](.*?)\[quote\]=i', '$1', $message);
 691                         $message = str_replace("[/quote][quote]", "", $message);
 692                 } while ($message != $oldmessage);
 693
 694                 $quotes = [];
 695
 696                 $startquotes = 0;
 697
 698                 $start = 0;
 699
 700                 while (($pos = strpos($message, '[quote', $start)) > 0) {
 701                         $quotes[$pos] = -1;
 702                         $start = $pos + 7;
 703                         $startquotes++;
 704                 }
 705
 706                 $endquotes = 0;
 707                 $start = 0;
 708
 709                 while (($pos = strpos($message, '[/quote]', $start)) > 0) {
 710                         $start = $pos + 7;
 711                         $endquotes++;
 712                 }
 713
 714                 while ($endquotes < $startquotes) {
 715                         $message .= '[/quote]';
 716                         ++$endquotes;
 717                 }
 718
 719                 $start = 0;
 720
 721                 while (($pos = strpos($message, '[/quote]', $start)) > 0) {
 722                         $quotes[$pos] = 1;
 723                         $start = $pos + 7;
 724                 }
 725
 726                 if (strtolower(substr($message, -8)) != '[/quote]')
 727                         return($message);
 728
 729                 krsort($quotes);
 730
 731                 $quotelevel = 0;
 732                 $quotestart = 0;
 733                 foreach ($quotes as $index => $quote) {
 734                         $quotelevel += $quote;
 735
 736                         if (($quotelevel == 0) and ($quotestart == 0))
 737                                 $quotestart = $index;
 738                 }
 739
 740                 if ($quotestart != 0) {
 741                         $message = trim(substr($message, 0, $quotestart))."\n[spoiler]".substr($message, $quotestart+7, -8).'[/spoiler]';
 742                 }
 743
 744                 return $message;
 745         }
 746 }