src/Protocol/Email.php

   1 <?php
   2 /**
   3  * @copyright Copyright (C) 2010-2022, 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 use \IMAP\Connection;
  31
  32 /**
  33  * Email class
  34  */
  35 class Email
  36 {
  37         /**
  38          * @param string $mailbox  The mailbox name
  39          * @param string $username The username
  40          * @param string $password The password
  41          * @return Connection|resource
  42          * @throws \Exception
  43          */
  44         public static function connect($mailbox, $username, $password)
  45         {
  46                 if (!function_exists('imap_open')) {
  47                         return false;
  48                 }
  49
  50                 $mbox = @imap_open($mailbox, $username, $password);
  51
  52                 $errors = imap_errors();
  53                 if (!empty($errors)) {
  54                         Logger::notice('IMAP Errors occured', ['errors' => $errors]);
  55                 }
  56
  57                 $alerts = imap_alerts();
  58                 if (!empty($alerts)) {
  59                         Logger::notice('IMAP Alerts occured: ', ['alerts' => $alerts]);
  60                 }
  61
  62                 return $mbox;
  63         }
  64
  65         /**
  66          * @param Connection|resource $mbox       mailbox
  67          * @param string              $email_addr email
  68          * @return array
  69          * @throws \Exception
  70          */
  71         public static function poll($mbox, $email_addr): array
  72         {
  73                 if (!$mbox || !$email_addr) {
  74                         return [];
  75                 }
  76
  77                 $search1 = @imap_search($mbox, 'UNDELETED FROM "' . $email_addr . '"', SE_UID);
  78                 if (!$search1) {
  79                         $search1 = [];
  80                 } else {
  81                         Logger::notice("Found mails from ".$email_addr);
  82                 }
  83
  84                 $search2 = @imap_search($mbox, 'UNDELETED TO "' . $email_addr . '"', SE_UID);
  85                 if (!$search2) {
  86                         $search2 = [];
  87                 } else {
  88                         Logger::notice("Found mails to ".$email_addr);
  89                 }
  90
  91                 $search3 = @imap_search($mbox, 'UNDELETED CC "' . $email_addr . '"', SE_UID);
  92                 if (!$search3) {
  93                         $search3 = [];
  94                 } else {
  95                         Logger::notice("Found mails cc ".$email_addr);
  96                 }
  97
  98                 $res = array_unique(array_merge($search1, $search2, $search3));
  99
 100                 return $res;
 101         }
 102
 103         /**
 104          * @param array   $mailacct mail account
 105          * @return string
 106          */
 107         public static function constructMailboxName($mailacct)
 108         {
 109                 $ret = '{' . $mailacct['server'] . ((intval($mailacct['port'])) ? ':' . $mailacct['port'] : '');
 110                 $ret .= (($mailacct['ssltype']) ?  '/' . $mailacct['ssltype'] . '/novalidate-cert' : '');
 111                 $ret .= '}' . $mailacct['mailbox'];
 112                 return $ret;
 113         }
 114
 115         /**
 116          * @param Connection|resource $mbox mailbox
 117          * @param integer             $uid  user id
 118          * @return mixed
 119          */
 120         public static function messageMeta($mbox, $uid)
 121         {
 122                 $ret = (($mbox && $uid) ? @imap_fetch_overview($mbox, $uid, FT_UID) : [[]]); // POSSIBLE CLEANUP --> array(array()) is probably redundant now
 123                 return (count($ret)) ? $ret : [];
 124         }
 125
 126         /**
 127          * @param Connection|resource $mbox  mailbox
 128          * @param integer             $uid   user id
 129          * @param string              $reply reply
 130          * @return array
 131          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 132          */
 133         public static function getMessage($mbox, $uid, $reply, $item): array
 134         {
 135                 $ret = $item;
 136
 137                 $struc = (($mbox && $uid) ? @imap_fetchstructure($mbox, $uid, FT_UID) : null);
 138
 139                 if (!$struc) {
 140                         Logger::notice("IMAP structure couldn't be fetched", ['uid' => $uid]);
 141                         return $ret;
 142                 }
 143
 144                 if (empty($struc->parts)) {
 145                         $html = trim(self::messageGetPart($mbox, $uid, $struc, 0, 'html'));
 146
 147                         if (!empty($html)) {
 148                                 $message = ['text' => '', 'html' => $html, 'item' => $ret];
 149                                 Hook::callAll('email_getmessage', $message);
 150                                 $ret = $message['item'];
 151                                 if (empty($ret['body'])) {
 152                                         $ret['body'] = HTML::toBBCode($message['html']);
 153                                 }
 154                         }
 155
 156                         if (empty($ret['body'])) {
 157                                 $text = self::messageGetPart($mbox, $uid, $struc, 0, 'plain');
 158
 159                                 $message = ['text' => $text, 'html' => '', 'item' => $ret];
 160                                 Hook::callAll('email_getmessage', $message);
 161                                 $ret = $message['item'];
 162                                 $ret['body'] = $message['text'];
 163                         }
 164                 } else {
 165                         $text = '';
 166                         $html = '';
 167                         foreach ($struc->parts as $ptop => $p) {
 168                                 $x = self::messageGetPart($mbox, $uid, $p, $ptop + 1, 'plain');
 169                                 if ($x) {
 170                                         $text .= $x;
 171                                 }
 172
 173                                 $x = self::messageGetPart($mbox, $uid, $p, $ptop + 1, 'html');
 174                                 if ($x) {
 175                                         $html .= $x;
 176                                 }
 177                         }
 178
 179                         $message = ['text' => trim($text), 'html' => trim($html), 'item' => $ret];
 180                         Hook::callAll('email_getmessage', $message);
 181                         $ret = $message['item'];
 182
 183                         if (empty($ret['body']) && !empty($message['html'])) {
 184                                 $ret['body'] = HTML::toBBCode($message['html']);
 185                         }
 186
 187                         if (empty($ret['body'])) {
 188                                 $ret['body'] = $message['text'];
 189                         }
 190                 }
 191
 192                 $ret['body'] = self::removeGPG($ret['body']);
 193                 $msg = self::removeSig($ret['body']);
 194                 $ret['body'] = $msg['body'];
 195                 $ret['body'] = self::convertQuote($ret['body'], $reply);
 196
 197                 if (trim($html) != '') {
 198                         $ret['body'] = self::removeLinebreak($ret['body']);
 199                 }
 200
 201                 $ret['body'] = self::unifyAttributionLine($ret['body']);
 202
 203                 $ret['body'] = Strings::escapeHtml($ret['body']);
 204                 $ret['body'] = BBCode::limitBodySize($ret['body']);
 205
 206                 Hook::callAll('email_getmessage_end', $ret);
 207
 208                 return $ret;
 209         }
 210
 211         /**
 212          * fetch the specified message part number with the specified subtype
 213          *
 214          * @param Connection|resource $mbox    mailbox
 215          * @param integer             $uid     user id
 216          * @param object              $p       parts
 217          * @param integer             $partno  part number
 218          * @param string              $subtype sub type
 219          * @return string
 220          */
 221         private static function messageGetPart($mbox, $uid, $p, $partno, $subtype)
 222         {
 223                 // $partno = '1', '2', '2.1', '2.1.3', etc for multipart, 0 if simple
 224                 global $htmlmsg,$plainmsg,$charset,$attachments;
 225
 226                 // DECODE DATA
 227                 $data = ($partno)
 228                         ? @imap_fetchbody($mbox, $uid, $partno, FT_UID|FT_PEEK)
 229                 : @imap_body($mbox, $uid, FT_UID|FT_PEEK);
 230
 231                 // Any part may be encoded, even plain text messages, so check everything.
 232                 if ($p->encoding == 4) {
 233                         $data = quoted_printable_decode($data);
 234                 } elseif ($p->encoding == 3) {
 235                         $data = base64_decode($data);
 236                 }
 237
 238                 // PARAMETERS
 239                 // get all parameters, like charset, filenames of attachments, etc.
 240                 $params = [];
 241                 if ($p->parameters) {
 242                         foreach ($p->parameters as $x) {
 243                                 $params[strtolower($x->attribute)] = $x->value;
 244                         }
 245                 }
 246
 247                 if (isset($p->dparameters) && $p->dparameters) {
 248                         foreach ($p->dparameters as $x) {
 249                                 $params[strtolower($x->attribute)] = $x->value;
 250                         }
 251                 }
 252
 253                 // ATTACHMENT
 254                 // Any part with a filename is an attachment,
 255                 // so an attached text file (type 0) is not mistaken as the message.
 256
 257                 if ((isset($params['filename']) && $params['filename']) || (isset($params['name']) && $params['name'])) {
 258                         // filename may be given as 'Filename' or 'Name' or both
 259                         $filename = ($params['filename'])? $params['filename'] : $params['name'];
 260                         // filename may be encoded, so see imap_mime_header_decode()
 261                         $attachments[$filename] = $data;  // this is a problem if two files have same name
 262                 }
 263
 264                 // TEXT
 265                 if ($p->type == 0 && $data) {
 266                         // Messages may be split in different parts because of inline attachments,
 267                         // so append parts together with blank row.
 268                         if (strtolower($p->subtype)==$subtype) {
 269                                 $data = iconv($params['charset'], 'UTF-8//IGNORE', $data);
 270                                 return (trim($data) ."\n\n");
 271                         } else {
 272                                 $data = '';
 273                         }
 274
 275                         // $htmlmsg .= $data ."<br><br>";
 276                         $charset = $params['charset'];  // assume all parts are same charset
 277                 }
 278
 279                 // EMBEDDED MESSAGE
 280                 // Many bounce notifications embed the original message as type 2,
 281                 // but AOL uses type 1 (multipart), which is not handled here.
 282                 // There are no PHP functions to parse embedded messages,
 283                 // so this just appends the raw source to the main message.
 284                 //      elseif ($p->type==2 && $data) {
 285                 //              $plainmsg .= $data."\n\n";
 286                 //      }
 287
 288                 // SUBPART RECURSION
 289                 if (isset($p->parts) && $p->parts) {
 290                         $x = "";
 291                         foreach ($p->parts as $partno0 => $p2) {
 292                                 $x .=  self::messageGetPart($mbox, $uid, $p2, $partno . '.' . ($partno0+1), $subtype);  // 1.2, 1.2.1, etc.
 293                         }
 294                         return $x;
 295                 }
 296         }
 297
 298         /**
 299          * @param string $in_str  in string
 300          * @param string $charset character set
 301          * @return string
 302          */
 303         public static function encodeHeader($in_str, $charset)
 304         {
 305                 $out_str = $in_str;
 306                 $need_to_convert = false;
 307
 308                 for ($x = 0; $x < strlen($in_str); $x ++) {
 309                         if ((ord($in_str[$x]) == 0) || ((ord($in_str[$x]) > 128))) {
 310                                 $need_to_convert = true;
 311                         }
 312                 }
 313
 314                 if (!$need_to_convert) {
 315                         return $in_str;
 316                 }
 317
 318                 if ($out_str && $charset) {
 319                         // define start delimimter, end delimiter and spacer
 320                         $end = "?=";
 321                         $start = "=?" . $charset . "?B?";
 322                         $spacer = $end . "\r\n " . $start;
 323
 324                         // determine length of encoded text within chunks
 325                         // and ensure length is even
 326                         $length = 75 - strlen($start) - strlen($end);
 327
 328                         /*
 329                                 [EDIT BY danbrown AT php DOT net: The following
 330                                 is a bugfix provided by (gardan AT gmx DOT de)
 331                                 on 31-MAR-2005 with the following note:
 332                                 "This means: $length should not be even,
 333                                 but divisible by 4. The reason is that in
 334                                 base64-encoding 3 8-bit-chars are represented
 335                                 by 4 6-bit-chars. These 4 chars must not be
 336                                 split between two encoded words, according
 337                                 to RFC-2047.
 338                         */
 339                         $length = $length - ($length % 4);
 340
 341                         // encode the string and split it into chunks
 342                         // with spacers after each chunk
 343                         $out_str = base64_encode($out_str);
 344                         $out_str = chunk_split($out_str, $length, $spacer);
 345
 346                         // remove trailing spacer and
 347                         // add start and end delimiters
 348                         $spacer = preg_quote($spacer, '/');
 349                         $out_str = preg_replace("/" . $spacer . "$/", "", $out_str);
 350                         $out_str = $start . $out_str . $end;
 351                 }
 352                 return $out_str;
 353         }
 354
 355         /**
 356          * Function send is used by Protocol::EMAIL code
 357          * (not to notify the user, but to send items to email contacts)
 358          *
 359          * @param string $addr    address
 360          * @param string $subject subject
 361          * @param string $headers headers
 362          * @param array  $item    item
 363          *
 364          * @return void
 365          *
 366          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 367          * @throws \ImagickException
 368          * @todo This could be changed to use the Emailer class
 369          */
 370         public static function send($addr, $subject, $headers, $item)
 371         {
 372                 //$headers .= 'MIME-Version: 1.0' . "\n";
 373                 //$headers .= 'Content-Type: text/html; charset=UTF-8' . "\n";
 374                 //$headers .= 'Content-Type: text/plain; charset=UTF-8' . "\n";
 375                 //$headers .= 'Content-Transfer-Encoding: 8bit' . "\n\n";
 376
 377                 $part = uniqid("", true);
 378
 379                 $html    = Item::prepareBody($item);
 380
 381                 $headers .= "Mime-Version: 1.0\n";
 382                 $headers .= 'Content-Type: multipart/alternative; boundary="=_'.$part.'"'."\n\n";
 383
 384                 $body = "\n--=_".$part."\n";
 385                 $body .= "Content-Transfer-Encoding: 8bit\n";
 386                 $body .= "Content-Type: text/plain; charset=utf-8; format=flowed\n\n";
 387
 388                 $body .= HTML::toPlaintext($html)."\n";
 389
 390                 $body .= "--=_".$part."\n";
 391                 $body .= "Content-Transfer-Encoding: 8bit\n";
 392                 $body .= "Content-Type: text/html; charset=utf-8\n\n";
 393
 394                 $body .= '<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">'.$html."</body></html>\n";
 395
 396                 $body .= "--=_".$part."--";
 397
 398                 //$message = '<html><body>' . $html . '</body></html>';
 399                 //$message = html2plain($html);
 400                 Logger::notice('notifier: email delivery to ' . $addr);
 401                 mail($addr, $subject, $body, $headers);
 402         }
 403
 404         /**
 405          * @param string $iri string
 406          * @return string
 407          */
 408         public static function iri2msgid($iri)
 409         {
 410                 if (!strpos($iri, "@")) {
 411                         $msgid = preg_replace("/urn:(\S+):(\S+)\.(\S+):(\d+):(\S+)/i", "urn!$1!$4!$5@$2.$3", $iri);
 412                 } else {
 413                         $msgid = $iri;
 414                 }
 415
 416                 return $msgid;
 417         }
 418
 419         /**
 420          * @param string $msgid msgid
 421          * @return string
 422          */
 423         public static function msgid2iri($msgid)
 424         {
 425                 if (strpos($msgid, "@")) {
 426                         $iri = preg_replace("/urn!(\S+)!(\d+)!(\S+)@(\S+)\.(\S+)/i", "urn:$1:$4.$5:$2:$3", $msgid);
 427                 } else {
 428                         $iri = $msgid;
 429                 }
 430
 431                 return $iri;
 432         }
 433
 434         private static function saveReplace($pattern, $replace, $text)
 435         {
 436                 $save = $text;
 437
 438                 $text = preg_replace($pattern, $replace, $text);
 439
 440                 if ($text == '') {
 441                         $text = $save;
 442                 }
 443                 return $text;
 444         }
 445
 446         private static function unifyAttributionLine($message)
 447         {
 448                 $quotestr = ['quote', 'spoiler'];
 449                 foreach ($quotestr as $quote) {
 450                         $message = self::saveReplace('/----- Original Message -----\s.*?From: "([^<"].*?)" <(.*?)>\s.*?To: (.*?)\s*?Cc: (.*?)\s*?Sent: (.*?)\s.*?Subject: ([^\n].*)\s*\['.$quote.'\]/i', "[".$quote."='$1']\n", $message);
 451                         $message = self::saveReplace('/----- Original Message -----\s.*?From: "([^<"].*?)" <(.*?)>\s.*?To: (.*?)\s*?Sent: (.*?)\s.*?Subject: ([^\n].*)\s*\['.$quote.'\]/i', "[".$quote."='$1']\n", $message);
 452
 453                         $message = self::saveReplace('/-------- Original-Nachricht --------\s*\['.$quote.'\]\nDatum: (.*?)\nVon: (.*?) <(.*?)>\nAn: (.*?)\nBetreff: (.*?)\n/i', "[".$quote."='$2']\n", $message);
 454                         $message = self::saveReplace('/-------- Original-Nachricht --------\s*\['.$quote.'\]\sDatum: (.*?)\s.*Von: "([^<"].*?)" <(.*?)>\s.*An: (.*?)\n.*/i', "[".$quote."='$2']\n", $message);
 455                         $message = self::saveReplace('/-------- Original-Nachricht --------\s*\['.$quote.'\]\nDatum: (.*?)\nVon: (.*?)\nAn: (.*?)\nBetreff: (.*?)\n/i', "[".$quote."='$2']\n", $message);
 456
 457                         $message = self::saveReplace('/-----Urspr.*?ngliche Nachricht-----\sVon: "([^<"].*?)" <(.*?)>\s.*Gesendet: (.*?)\s.*An: (.*?)\s.*Betreff: ([^\n].*?).*:\s*\['.$quote.'\]/i', "[".$quote."='$1']\n", $message);
 458                         $message = self::saveReplace('/-----Urspr.*?ngliche Nachricht-----\sVon: "([^<"].*?)" <(.*?)>\s.*Gesendet: (.*?)\s.*An: (.*?)\s.*Betreff: ([^\n].*?)\s*\['.$quote.'\]/i', "[".$quote."='$1']\n", $message);
 459
 460                         $message = self::saveReplace('/Am (.*?), schrieb (.*?):\s*\['.$quote.'\]/i', "[".$quote."='$2']\n", $message);
 461
 462                         $message = self::saveReplace('/Am .*?, \d+ .*? \d+ \d+:\d+:\d+ \+\d+\sschrieb\s(.*?)\s<(.*?)>:\s*\['.$quote.'\]/i', "[".$quote."='$1']\n", $message);
 463
 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 (.*?):\s*\['.$quote.'\]/i', "[".$quote."='$2']\n", $message);
 467                         $message = self::saveReplace('/Am (.*?) schrieb (.*?)\n(.*?):\s*\['.$quote.'\]/i', "[".$quote."='$2']\n", $message);
 468
 469                         $message = self::saveReplace('/(\d+)\/(\d+)\/(\d+) ([^<"].*?) <(.*?)>\s*\['.$quote.'\]/i', "[".$quote."='$4']\n", $message);
 470
 471                         $message = self::saveReplace('/On .*?, \d+ .*? \d+ \d+:\d+:\d+ \+\d+\s(.*?)\s<(.*?)>\swrote:\s*\['.$quote.'\]/i', "[".$quote."='$1']\n", $message);
 472
 473                         $message = self::saveReplace('/On (.*?) at (.*?), (.*?)\s<(.*?)>\swrote:\s*\['.$quote.'\]/i', "[".$quote."='$3']\n", $message);
 474                         $message = self::saveReplace('/On (.*?)\n([^<].*?)\s<(.*?)>\swrote:\s*\['.$quote.'\]/i', "[".$quote."='$2']\n", $message);
 475                         $message = self::saveReplace('/On (.*?), (.*?), (.*?)\s<(.*?)>\swrote:\s*\['.$quote.'\]/i', "[".$quote."='$3']\n", $message);
 476                         $message = self::saveReplace('/On ([^,].*?), (.*?)\swrote:\s*\['.$quote.'\]/i', "[".$quote."='$2']\n", $message);
 477                         $message = self::saveReplace('/On (.*?), (.*?)\swrote\s*\['.$quote.'\]/i', "[".$quote."='$2']\n", $message);
 478
 479                         // Der loescht manchmal den Body - was eigentlich unmoeglich ist
 480                         $message = self::saveReplace('/On (.*?),(.*?),(.*?),(.*?), (.*?) wrote:\s*\['.$quote.'\]/i', "[".$quote."='$5']\n", $message);
 481
 482                         $message = self::saveReplace('/Zitat von ([^<].*?) <(.*?)>:\s*\['.$quote.'\]/i', "[".$quote."='$1']\n", $message);
 483
 484                         $message = self::saveReplace('/Quoting ([^<].*?) <(.*?)>:\s*\['.$quote.'\]/i', "[".$quote."='$1']\n", $message);
 485
 486                         $message = self::saveReplace('/From: "([^<"].*?)" <(.*?)>\s*\['.$quote.'\]/i', "[".$quote."='$1']\n", $message);
 487                         $message = self::saveReplace('/From: <(.*?)>\s*\['.$quote.'\]/i', "[".$quote."='$1']\n", $message);
 488
 489                         $message = self::saveReplace('/Du \(([^)].*?)\) schreibst:\s*\['.$quote.'\]/i', "[".$quote."='$1']\n", $message);
 490
 491                         $message = self::saveReplace('/--- (.*?) <.*?> schrieb am (.*?):\s*\['.$quote.'\]/i', "[".$quote."='$1']\n", $message);
 492                         $message = self::saveReplace('/--- (.*?) schrieb am (.*?):\s*\['.$quote.'\]/i', "[".$quote."='$1']\n", $message);
 493
 494                         $message = self::saveReplace('/\* (.*?) <(.*?)> hat geschrieben:\s*\['.$quote.'\]/i', "[".$quote."='$1']\n", $message);
 495
 496                         $message = self::saveReplace('/(.*?) <(.*?)> schrieb (.*?)\):\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 am (.*?) um (.*):\s*\['.$quote.'\]/i', "[".$quote."='$1']\n", $message);
 499                         $message = self::saveReplace('/(.*?) \((.*?)\) schrieb:\s*\['.$quote.'\]/i', "[".$quote."='$2']\n", $message);
 500                         $message = self::saveReplace('/(.*?) schrieb:\s*\['.$quote.'\]/i', "[".$quote."='$1']\n", $message);
 501
 502                         $message = self::saveReplace('/(.*?) <(.*?)> writes:\s*\['.$quote.'\]/i', "[".$quote."='$1']\n", $message);
 503                         $message = self::saveReplace('/(.*?) \((.*?)\) writes:\s*\['.$quote.'\]/i', "[".$quote."='$2']\n", $message);
 504                         $message = self::saveReplace('/(.*?) writes:\s*\['.$quote.'\]/i', "[".$quote."='$1']\n", $message);
 505
 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                         $message = self::saveReplace('/(.*?) wrote:\s*\['.$quote.'\]/i', "[".$quote."='$1']\n", $message);
 509
 510                         $message = self::saveReplace('/([^<].*?) <.*?> hat am (.*?)\sum\s(.*)\sgeschrieben:\s*\['.$quote.'\]/i', "[".$quote."='$1']\n", $message);
 511
 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                         $message = self::saveReplace('/(\d+)\/(\d+)\/(\d+) <(.*?)>\s*\['.$quote.'\]/i', "[".$quote."='$4']\n", $message);
 516
 517                         $message = self::saveReplace('/(.*?) <(.*?)> schrubselte:\s*\['.$quote.'\]/i', "[".$quote."='$1']\n", $message);
 518                         $message = self::saveReplace('/(.*?) \((.*?)\) schrubselte:\s*\['.$quote.'\]/i', "[".$quote."='$2']\n", $message);
 519                 }
 520                 return $message;
 521         }
 522
 523         private static function removeGPG($message)
 524         {
 525                 $pattern = '/(.*)\s*-----BEGIN PGP SIGNED MESSAGE-----\s*[\r\n].*Hash:.*?[\r\n](.*)'.
 526                         '[\r\n]\s*-----BEGIN PGP SIGNATURE-----\s*[\r\n].*'.
 527                         '[\r\n]\s*-----END PGP SIGNATURE-----(.*)/is';
 528
 529                 if (preg_match($pattern, $message, $result)) {
 530                         $cleaned = trim($result[1].$result[2].$result[3]);
 531
 532                         $cleaned = str_replace(["\n- --\n", "\n- -"], ["\n-- \n", "\n-"], $cleaned);
 533                 } else {
 534                         $cleaned = $message;
 535                 }
 536
 537                 return $cleaned;
 538         }
 539
 540         private static function removeSig($message)
 541         {
 542                 $sigpos = strrpos($message, "\n-- \n");
 543                 $quotepos = strrpos($message, "[/quote]");
 544
 545                 if ($sigpos == 0) {
 546                         // Especially for web.de who are using that as a separator
 547                         $message = str_replace("\n___________________________________________________________\n", "\n-- \n", $message);
 548                         $sigpos = strrpos($message, "\n-- \n");
 549                         $quotepos = strrpos($message, "[/quote]");
 550                 }
 551
 552                 // When the signature separator is inside a quote, we don't separate
 553                 if (($sigpos < $quotepos) && ($sigpos != 0)) {
 554                         return ['body' => $message, 'sig' => ''];
 555                 }
 556
 557                 $pattern = '/(.*)[\r\n]-- [\r\n](.*)/is';
 558
 559                 preg_match($pattern, $message, $result);
 560
 561                 if (!empty($result[1]) && !empty($result[2])) {
 562                         $cleaned = trim($result[1])."\n";
 563                         $sig = trim($result[2]);
 564                 } else {
 565                         $cleaned = $message;
 566                         $sig = '';
 567                 }
 568
 569                 return ['body' => $cleaned, 'sig' => $sig];
 570         }
 571
 572         private static function removeLinebreak($message)
 573         {
 574                 $arrbody = explode("\n", trim($message));
 575
 576                 $lines = [];
 577                 $lineno = 0;
 578
 579                 foreach ($arrbody as $i => $line) {
 580                         $currquotelevel = 0;
 581                         $currline = $line;
 582                         while ((strlen($currline)>0) && ((substr($currline, 0, 1) == '>')
 583                                 || (substr($currline, 0, 1) == ' '))) {
 584                                 if (substr($currline, 0, 1) == '>') {
 585                                         $currquotelevel++;
 586                                 }
 587
 588                                 $currline = ltrim(substr($currline, 1));
 589                         }
 590
 591                         $quotelevel = 0;
 592                         $nextline = trim($arrbody[$i + 1] ?? '');
 593                         while ((strlen($nextline)>0) && ((substr($nextline, 0, 1) == '>')
 594                                 || (substr($nextline, 0, 1) == ' '))) {
 595                                 if (substr($nextline, 0, 1) == '>') {
 596                                         $quotelevel++;
 597                                 }
 598
 599                                 $nextline = ltrim(substr($nextline, 1));
 600                         }
 601
 602                         if (!empty($lines[$lineno])) {
 603                                 if (substr($lines[$lineno], -1) != ' ') {
 604                                         $lines[$lineno] .= ' ';
 605                                 }
 606
 607                                 while ((strlen($line)>0) && ((substr($line, 0, 1) == '>')
 608                                         || (substr($line, 0, 1) == ' '))) {
 609
 610                                         $line = ltrim(substr($line, 1));
 611                                 }
 612                         } else {
 613                                 $lines[$lineno] = '';
 614                         }
 615
 616                         $lines[$lineno] .= $line;
 617                         if (((substr($line, -1, 1) != ' '))
 618                                 || ($quotelevel != $currquotelevel)) {
 619                                 $lineno++;
 620                         }
 621                 }
 622                 return implode("\n", $lines);
 623         }
 624
 625         private static function convertQuote($body, $reply)
 626         {
 627                 // Convert Quotes
 628                 $arrbody = explode("\n", trim($body));
 629                 $arrlevel = [];
 630
 631                 for ($i = 0; $i < count($arrbody); $i++) {
 632                         $quotelevel = 0;
 633                         $quoteline = $arrbody[$i];
 634
 635                         while ((strlen($quoteline)>0) and ((substr($quoteline, 0, 1) == '>')
 636                                 || (substr($quoteline, 0, 1) == ' '))) {
 637                                 if (substr($quoteline, 0, 1) == '>')
 638                                         $quotelevel++;
 639
 640                                 $quoteline = ltrim(substr($quoteline, 1));
 641                         }
 642
 643                         $arrlevel[$i] = $quotelevel;
 644                         $arrbody[$i] = $quoteline;
 645                 }
 646
 647                 $quotelevel = 0;
 648                 $arrbodyquoted = [];
 649
 650                 for ($i = 0; $i < count($arrbody); $i++) {
 651                         $previousquote = $quotelevel;
 652                         $quotelevel = $arrlevel[$i];
 653
 654                         while ($previousquote < $quotelevel) {
 655                                 $quote = "[quote]";
 656                                 $arrbody[$i] = $quote.$arrbody[$i];
 657                                 $previousquote++;
 658                         }
 659
 660                         while ($previousquote > $quotelevel) {
 661                                 $arrbody[$i] = '[/quote]'.$arrbody[$i];
 662                                 $previousquote--;
 663                         }
 664
 665                         $arrbodyquoted[] = $arrbody[$i];
 666                 }
 667                 while ($quotelevel > 0) {
 668                         $arrbodyquoted[] = '[/quote]';
 669                         $quotelevel--;
 670                 }
 671
 672                 $body = implode("\n", $arrbodyquoted);
 673
 674                 if (strlen($body) > 0) {
 675                         $body = $body."\n\n";
 676                 }
 677
 678                 if ($reply) {
 679                         $body = self::removeToFu($body);
 680                 }
 681
 682                 return $body;
 683         }
 684
 685         private static function removeToFu($message)
 686         {
 687                 $message = trim($message);
 688
 689                 do {
 690                         $oldmessage = $message;
 691                         $message = preg_replace('=\[/quote\][\s](.*?)\[quote\]=i', '$1', $message);
 692                         $message = str_replace("[/quote][quote]", "", $message);
 693                 } while ($message != $oldmessage);
 694
 695                 $quotes = [];
 696
 697                 $startquotes = 0;
 698
 699                 $start = 0;
 700
 701                 while (($pos = strpos($message, '[quote', $start)) > 0) {
 702                         $quotes[$pos] = -1;
 703                         $start = $pos + 7;
 704                         $startquotes++;
 705                 }
 706
 707                 $endquotes = 0;
 708                 $start = 0;
 709
 710                 while (($pos = strpos($message, '[/quote]', $start)) > 0) {
 711                         $start = $pos + 7;
 712                         $endquotes++;
 713                 }
 714
 715                 while ($endquotes < $startquotes) {
 716                         $message .= '[/quote]';
 717                         ++$endquotes;
 718                 }
 719
 720                 $start = 0;
 721
 722                 while (($pos = strpos($message, '[/quote]', $start)) > 0) {
 723                         $quotes[$pos] = 1;
 724                         $start = $pos + 7;
 725                 }
 726
 727                 if (strtolower(substr($message, -8)) != '[/quote]')
 728                         return($message);
 729
 730                 krsort($quotes);
 731
 732                 $quotelevel = 0;
 733                 $quotestart = 0;
 734                 foreach ($quotes as $index => $quote) {
 735                         $quotelevel += $quote;
 736
 737                         if (($quotelevel == 0) and ($quotestart == 0))
 738                                 $quotestart = $index;
 739                 }
 740
 741                 if ($quotestart != 0) {
 742                         $message = trim(substr($message, 0, $quotestart))."\n[spoiler]".substr($message, $quotestart+7, -8).'[/spoiler]';
 743                 }
 744
 745                 return $message;
 746         }
 747 }