[squirrelmail.git] / functions / mime.php

<?php

/**
 * mime.php
 *
 * Copyright (c) 1999-2002 The SquirrelMail Project Team
 * Licensed under the GNU GPL. For full terms see the file COPYING.
 *
 * This contains the functions necessary to detect and decode MIME
 * messages.
 *
 * $Id$
 */

require_once('../functions/imap.php');
require_once('../functions/attachment_common.php');

/** Setting up the objects that have the structure for the message **/
class msg_header {
    /** msg_header contains generic variables for values that **/
    /** could be in a header.                                 **/

    var $type0 = '', $type1 = '', $boundary = '', $charset = '',
        $encoding = '', $size = 0, $to = array(), $from = '', $date = '',
        $cc = array(), $bcc = array(), $reply_to = '', $subject = '',
        $id = 0, $mailbox = '', $description = '', $filename = '',
        $entity_id = 0, $message_id = 0, $name = '', $priority = 3, $type = '';
}

class message {
    /** message is the object that contains messages.  It is a recursive
      object in that through the $entities variable, it can contain
      more objects of type message.  See documentation in mime.txt for
      a better description of how this works.
    **/
    var $header = '', $entities = array();

    function addEntity ($msg) {
        $this->entities[] = $msg;
    }
}

/* --------------------------------------------------------------------------------- */
/* MIME DECODING                                                                     */
/* --------------------------------------------------------------------------------- */

/* This function gets the structure of a message and stores it in the "message" class.
 * It will return this object for use with all relevant header information and
 * fully parsed into the standard "message" object format.
 */
function mime_structure ($imap_stream, $header) {

    $ssid = sqimap_session_id();
    $lsid = strlen( $ssid );
    $id = $header->id;
    fputs ($imap_stream, "$ssid FETCH $id BODYSTRUCTURE\r\n");
    //
    // This should use sqimap_read_data instead of reading it itself
    //
    $read = fgets ($imap_stream, 9216);
    $bodystructure = '';
    while ( substr($read, 0, $lsid) <> $ssid &&
         !feof( $imap_stream ) ) {
        $bodystructure .= $read;
        $read = fgets ($imap_stream, 9216);
    }
    $read = $bodystructure;

    // isolate the body structure and remove beginning and end parenthesis
    $read = trim(substr ($read, strpos(strtolower($read), 'bodystructure') + 13));

    $read = trim(substr ($read, 0, -1));
    $end = mime_match_parenthesis(0, $read);
    while ($end == strlen($read)-1) {
        $read = trim(substr ($read, 0, -1));
        $read = trim(substr ($read, 1));
        $end = mime_match_parenthesis(0, $read);
    }

    $msg = mime_parse_structure ($read, 0);
    $msg->header = $header;

    return( $msg );
}

/* this starts the parsing of a particular structure.  It is called recursively,
 * so it can be passed different structures.  It returns an object of type
 * $message.
 * First, it checks to see if it is a multipart message.  If it is, then it
 * handles that as it sees is necessary.  If it is just a regular entity,
 * then it parses it and adds the necessary header information (by calling out
 * to mime_get_elements()
 */
function mime_parse_structure ($structure, $ent_id) {
  global $mailbox;
  $properties = array();
  $msg = new message();
  if ($structure{0} == '(') {
     $old_ent_id = $ent_id;
     $ent_id = mime_new_element_level($ent_id);
     $start = $end = -1;
     do {
        $start = $end+1;
        $end = mime_match_parenthesis ($start, $structure);

	/* check if we are dealing with a new entity-level */
	$i = strrpos($ent_id,'.');
	if ($i>0) {
	    $ent = substr($ent_id, $i+1);
	} else {
	    $ent = '';
	}
        /* add "forgotten"  parent entities (alternative and relative) */
	if ($ent == '0') {
	    /* new entity levels have information about the type (type1) and 
	    *  the properties. This information is situated at the end of the 
	    *  structure string like for example (example between the brackets) 
	    *  [ "RELATED" ("BOUNDARY" "myboundary" "TYPE" "plain/html") ]
	    */
	    
	    /* get the involved properties for parsing to mime_get_properties */
	    $startprop = strrpos($structure,'(');
	    $properties_str = substr($structure,$startprop);
	    $endprop = mime_match_parenthesis ($startprop, $structure);
	    $propstr = substr($structure, $startprop + 1, ($endprop - $startprop)-1);
	    /* cut off the used properties */
	    if ($startprop) { 
		$structure_end = substr($structure, $endprop+2);
		$structure = trim(substr($structure,0,$startprop));
	    }
	    /* get type1 */
	    $pos = strrpos($structure,' ');
	    if ($structure{$pos+1} =='(') $pos++;
	    
	    $type1 = strtolower(substr($structure, $pos+2, (count($structure)-2)));
	    /* cut off  type1 */
	    if ($pos && $startprop) {
		$structure = trim(substr($structure, 0, $pos));
	    }

	    /* process the found information */
            $properties = mime_get_props($properties, $properties_str);
	    if (count($properties)>0) {
		$msg->header->entity_id = $old_ent_id;
		$msg->header->type0 = 'multipart';
		$msg->header->type1 = $type1;
		for ($i=0; $i < count($properties); $i++) {
    		    $msg->header->{$properties[$i]['name']} = $properties[$i]['value'];
		}
	    }
	    $structure = $structure . ' ' . $structure_end;
	} 
    	$element = substr($structure, $start+1, ($end - $start)-1);
    	$ent_id = mime_increment_id ($ent_id);
    	$newmsg = mime_parse_structure ($element, $ent_id);
	/* set mailbox in case of message/rfc822 entities */
	if (isset($newmsg->header->type0) && isset($newmsg->header->type1)) {
	    if ($newmsg->header->type0 == 'message' && $newmsg->header->type1 == 'rfc822') {
		$newmsg->header->mailbox=$mailbox;
	    }
	}
    	$msg->addEntity ($newmsg);

     } while ($structure{$end+1} == '(');
  } else {
     // parse the elements
    $msg = mime_get_element ($structure, $msg, $ent_id);
  }
  return $msg;
}


/* Increments the element ID.  An element id can look like any of
 * the following:  1, 1.2, 4.3.2.4.1, etc.  This function increments
 * the last number of the element id, changing 1.2 to 1.3.
 */
function mime_increment_id ($id) {

    if (strpos($id, '.')) {
        $first = substr($id, 0, strrpos($id, '.'));
        $last = substr($id, strrpos($id, '.')+1);
        $last++;
        $new = $first . '.' .$last;
    } else {
        $new = $id + 1;
    }

    return $new;
}

/*
 * See comment for mime_increment_id().
 * This adds another level on to the entity_id changing 1.3 to 1.3.0
 * NOTE:  1.3.0 is not a valid element ID.  It MUST be incremented
 *        before it can be used.  I left it this way so as not to have
 *        to make a special case if it is the first entity_id.  It
 *        always increments it, and that works fine.
 */
function mime_new_element_level ($id) {

    if (!$id) {
        $id = 0;
    } else {
        $id = $id . '.0';
    }

    return( $id );
}

function mime_get_element (&$structure, $msg, $ent_id) {

  $elem_num = 1;
  $msg->header = new msg_header();
  $msg->header->entity_id = $ent_id;
  $properties = array();
  while (strlen($structure) > 0) {
     $structure = trim($structure);
     $char = $structure{0};

     if (strtolower(substr($structure, 0, 3)) == 'nil') {
        $text = '';
        $structure = substr($structure, 3);
     } else if ($char == '"') {
        // loop through until we find the matching quote, and return that as a string
        $pos = 1;
        $text = '';
        while ( ($char = $structure{$pos} ) <> '"' && $pos < strlen($structure)) {
           $text .= $char;
           $pos++;
        }
        $structure = substr($structure, strlen($text) + 2);
     } else if ($char == '{') {
         /**
          * loop through until we find the matching quote, 
          * and return that as a string
          */
         $pos = 1;
         $len = '';
         while (($char = $structure{$pos}) != '}' 
                && $pos < strlen($structure)) {
             $len .= $char;
             $pos++;
         }
         $structure = substr($structure, strlen($len) + 4);
         $text = substr($structure, 0, $len);
         $structure = substr($structure, $len + 1);
     } else if ($char == '(') {
        // comment me
        $end = mime_match_parenthesis (0, $structure);
        $sub = substr($structure, 1, $end-1);
        $properties = mime_get_props($properties, $sub);
        $structure = substr($structure, strlen($sub) + 2);
     } else {
        // loop through until we find a space or an end parenthesis
        $pos = 0;
        $char = $structure{$pos};
        $text = '';
        while ($char != ' ' && $char != ')' && $pos < strlen($structure)) {
           $text .= $char;
           $pos++;
           $char = $structure{$pos};
        }
        $structure = substr($structure, strlen($text));
     }

     // This is where all the text parts get put into the header
     switch ($elem_num) {
        case 1:
           $msg->header->type0 = strtolower($text);
           break;
        case 2:
           $msg->header->type1 = strtolower($text);
           break;
        case 4: // Id
           // Invisimail enclose images with <>
           $msg->header->id = str_replace( '<', '', str_replace( '>', '', $text ) );
           break;
        case 5:
           $msg->header->description = $text;
           break;
        case 6:
           $msg->header->encoding = strtolower($text);
           break;
        case 7:
           $msg->header->size = $text;
           break;
        default:
           if ($msg->header->type0 == 'text' && $elem_num == 8) {
              // This is a plain text message, so lets get the number of lines
              // that it contains.
              $msg->header->num_lines = $text;

           } else if ($msg->header->type0 == 'message' && $msg->header->type1 == 'rfc822' && $elem_num == 8) {
              // This is an encapsulated message, so lets start all over again and
              // parse this message adding it on to the existing one.
              $structure = trim($structure);
              if ( $structure{0} == '(' ) {
                 $e = mime_match_parenthesis (0, $structure);
                 $structure = substr($structure, 0, $e);
                 $structure = substr($structure, 1);
                 $m = mime_parse_structure($structure, $msg->header->entity_id);

                 // the following conditional is there to correct a bug that wasn't
                 // incrementing the entity IDs correctly because of the special case
                 // that message/rfc822 is.  This fixes it fine.
                 if (substr($structure, 1, 1) != '(')
                    $m->header->entity_id = mime_increment_id(mime_new_element_level($ent_id));

                 // Now we'll go through and reformat the results.
                 if ($m->entities) {
                    for ($i=0; $i < count($m->entities); $i++) {
                       $msg->addEntity($m->entities[$i]);
                    }
                 } else {
                    $msg->addEntity($m);
                 }
                 $structure = "";
              }
           }
           break;
     }
     $elem_num++;
     $text = "";
  }
  // loop through the additional properties and put those in the various headers
  for ($i=0; $i < count($properties); $i++) {
     $msg->header->{$properties[$i]['name']} = $properties[$i]['value'];
  }

  return $msg;
}

/*
 * I did most of the MIME stuff yesterday (June 20, 2000), but I couldn't
 * figure out how to do this part, so I decided to go to bed.  I woke up
 * in the morning and had a flash of insight.  I went to the white-board
 * and scribbled it out, then spent a bit programming it, and this is the
 * result.  Nothing complicated, but I think my brain was fried yesterday.
 * Funny how that happens some times.
 *
 * This gets properties in a nested parenthesisized list.  For example,
 * this would get passed something like:  ("attachment" ("filename" "luke.tar.gz"))
 * This returns an array called $props with all paired up properties.
 * It ignores the "attachment" for now, maybe that should change later
 * down the road.  In this case, what is returned is:
 *    $props[0]["name"] = "filename";
 *    $props[0]["value"] = "luke.tar.gz";
 */
function mime_get_props ($props, $structure) {

  while (strlen($structure) > 0) {
     $structure = trim($structure);
     $char = $structure{0};
     if ($char == '"') {
        $pos = 1;
        $tmp = '';
        while ( ( $char = $structure{$pos} ) != '"' &&
                $pos < strlen($structure)) {
           $tmp .= $char;
           $pos++;
        }
        $structure = trim(substr($structure, strlen($tmp) + 2));
        $char = $structure{0};

        if ($char == '"') {
           $pos = 1;
           $value = '';
           while ( ( $char = $structure{$pos} ) != '"' &&
                   $pos < strlen($structure) ) {
              $value .= $char;
              $pos++;
           }
           $structure = trim(substr($structure, strlen($value) + 2));
           $k = count($props);
           $props[$k]['name'] = strtolower($tmp);
           $props[$k]['value'] = $value;
	   if ($structure != '') {
		mime_get_props($props, $structure);
	   } else {
	     return $props;
	   }     	
        } else if ($char == '(') {
           $end = mime_match_parenthesis (0, $structure);
           $sub = substr($structure, 1, $end-1);
    	   if (! isset($props))
              $props = array();
              $props = mime_get_props($props, $sub);
              $structure = substr($structure, strlen($sub) + 2);
	   return $props;      
        }
     } else if ($char == '(') {
        $end = mime_match_parenthesis (0, $structure);
        $sub = substr($structure, 1, $end-1);
        $props = mime_get_props($props, $sub);
        $structure = substr($structure, strlen($sub) + 2);
        return $props;
     } else {
        return $props;
     }
  }
}

/*
 *  Matches parenthesis.  It will return the position of the matching
 *  parenthesis in $structure.  For instance, if $structure was:
 *     ("text" "plain" ("val1name", "1") nil ... )
 *     x                                         x
 *  then this would return 42 to match up those two.
 */
function mime_match_parenthesis ($pos, $structure) {

    $j = strlen( $structure );
    
    // ignore all extra characters
    // If inside of a string, skip string -- Boundary IDs and other
    // things can have ) in them.
    if ( $structure{$pos} != '(' ) {
        return( $j );
    }
    
    while ( $pos < $j ) {
        $pos++;
        if ($structure{$pos} == ')') {
            return $pos;
        } elseif ($structure{$pos} == '"') {
            $pos++;
            while ( $structure{$pos} != '"' &&
                    $pos < $j ) {
               if (substr($structure, $pos, 2) == '\\"') {
                  $pos++;
               } elseif (substr($structure, $pos, 2) == '\\\\') {
                  $pos++;
               }
               $pos++;
            }
        } elseif ( $structure{$pos} == '(' ) {
            $pos = mime_match_parenthesis ($pos, $structure);
        }
    }
    echo _("Error decoding mime structure.  Report this as a bug!") . '<br>';
    return( $pos );
}

function mime_fetch_body($imap_stream, $id, $ent_id) {

    /*
     * do a bit of error correction.  If we couldn't find the entity id, just guess
     * that it is the first one.  That is usually the case anyway.
     */
    if (!$ent_id) {
        $ent_id = 1;
    }
    $cmd = "FETCH $id BODY[$ent_id]";

    $data = sqimap_run_command ($imap_stream, $cmd, true, $response, $message);
    do {
        $topline = trim(array_shift( $data ));
    } while( $topline && $topline[0] == '*' && !preg_match( '/\* [0-9]+ FETCH.*/i', $topline )) ;
    $wholemessage = implode('', $data);
    if (ereg('\\{([^\\}]*)\\}', $topline, $regs)) {

        $ret = substr( $wholemessage, 0, $regs[1] );
        /*
            There is some information in the content info header that could be important
            in order to parse html messages. Let's get them here.
        */
        if ( $ret{0} == '<' ) {
            $data = sqimap_run_command ($imap_stream, "FETCH $id BODY[$ent_id.MIME]", true, $response, $message);
            /* BASE within HTML documents is illegal (see w3 spec)
*            $base = '';
*            $k = 10;
*            foreach( $data as $d ) {
*                if ( substr( $d, 0, 13 ) == 'Content-Base:' ) {
*                    $j = strlen( $d );
*                    $i = 13;
*                    $base = '';
*                    while ( $i < $j &&
*                           ( !isNoSep( $d{$i} ) || $d{$i} == '"' )  )
*                        $i++;
*                    while ( $i < $j ) {
*                        if ( isNoSep( $d{$i} ) )
*                            $base .= $d{$i};
*                        $i++;
*                    }
*                    $k = 0;
*                } elseif ( $k == 1 && !isnosep( $d{0} ) ) {
*                    $base .= substr( $d, 1 );
*                }
*                $k++;
*            }
*            if ( $base <> '' ) {
*                $ret = "<base href=\"$base\">" . $ret;
*            }
*           */
        }
    } else if (ereg('"([^"]*)"', $topline, $regs)) {
        $ret = $regs[1];
    } else {
        global $where, $what, $mailbox, $passed_id, $startMessage;
        $par = 'mailbox=' . urlencode($mailbox) . "&amp;passed_id=$passed_id";
        if (isset($where) && isset($what)) {
            $par .= '&amp;where='. urlencode($where) . "&amp;what=" . urlencode($what);
        } else {
            $par .= "&amp;startMessage=$startMessage&amp;show_more=0";
        }
        $par .= '&amp;response=' . urlencode($response) .
                '&amp;message=' . urlencode($message).
                '&amp;topline=' . urlencode($topline);

        echo   '<tt><br>' .
               '<table width="80%"><tr>' .
               '<tr><td colspan=2>' .
               _("Body retrieval error. The reason for this is most probably that the message is malformed. Please help us making future versions better by submitting this message to the developers knowledgebase!") .
               " <A HREF=\"../src/retrievalerror.php?$par\"><br>" .
               _("Submit message") . '</A><BR>&nbsp;' .
               '</td></tr>' .
               '<td><b>' . _("Command:") . "</td><td>$cmd</td></tr>" .
               '<td><b>' . _("Response:") . "</td><td>$response</td></tr>" .
               '<td><b>' . _("Message:") . "</td><td>$message</td></tr>" .
               '<td><b>' . _("FETCH line:") . "</td><td>$topline</td></tr>" .
               "</table><BR></tt></font><hr>";

        $data = sqimap_run_command ($imap_stream, "FETCH $passed_id BODY[]", true, $response, $message);
        array_shift($data);
        $wholemessage = implode('', $data);

        $ret = $wholemessage;
    }
    return( $ret );
}

function mime_print_body_lines ($imap_stream, $id, $ent_id, $encoding) {
    // do a bit of error correction.  If we couldn't find the entity id, just guess
    // that it is the first one.  That is usually the case anyway.
    if (!$ent_id) {
        $ent_id = 1;
    }
    $sid = sqimap_session_id();
    // Don't kill the connection if the browser is over a dialup
    // and it would take over 30 seconds to download it.
Commit	Line	Data
59177427	1	<?php
2ba13803	2
35586184	3	/**
	4	* mime.php
	5	*
15e6162e	6	* Copyright (c) 1999-2002 The SquirrelMail Project Team
35586184	7	* Licensed under the GNU GPL. For full terms see the file COPYING.
	8	*
	9	* This contains the functions necessary to detect and decode MIME
	10	* messages.
	11	*
	12	* $Id$
	13	*/
b74ba498	14
35586184	15	require_once('../functions/imap.php');
35586184	16	require_once('../functions/attachment_common.php');
8beafbbc	17
35586184	18	/ Setting up the objects that have the structure for the message /
	19	class msg_header {
	20	/ msg_header contains generic variables for values that /
	21	/ could be in a header. /
b74ba498	22
88cb1b4d	23	var $type0 = '', $type1 = '', $boundary = '', $charset = '',
	24	$encoding = '', $size = 0, $to = array(), $from = '', $date = '',
	25	$cc = array(), $bcc = array(), $reply_to = '', $subject = '',
	26	$id = 0, $mailbox = '', $description = '', $filename = '',
c9d78ab4	27	$entity_id = 0, $message_id = 0, $name = '', $priority = 3, $type = '';
35586184	28	}
b74ba498	29
451f74a2	30	class message {
	31	/** message is the object that contains messages. It is a recursive
	32	object in that through the $entities variable, it can contain
	33	more objects of type message. See documentation in mime.txt for
	34	a better description of how this works.
	35	**/
77b88425	36	var $header = '', $entities = array();
77b88425	37
451f74a2	38	function addEntity ($msg) {
	39	$this->entities[] = $msg;
	40	}
	41	}
8beafbbc	42
451f74a2	43	/* --------------------------------------------------------------------------------- */
	44	/* MIME DECODING */
	45	/* --------------------------------------------------------------------------------- */
b74ba498	46
451f74a2	47	/* This function gets the structure of a message and stores it in the "message" class.
	48	* It will return this object for use with all relevant header information and
	49	* fully parsed into the standard "message" object format.
	50	*/
	51	function mime_structure ($imap_stream, $header) {
	52
451f74a2	53	$ssid = sqimap_session_id();
	54	$lsid = strlen( $ssid );
	55	$id = $header->id;
	56	fputs ($imap_stream, "$ssid FETCH $id BODYSTRUCTURE\r\n");
	57	//
	58	// This should use sqimap_read_data instead of reading it itself
	59	//
77b88425	60	$read = fgets ($imap_stream, 9216);
451f74a2	61	$bodystructure = '';
	62	while ( substr($read, 0, $lsid) <> $ssid &&
	63	!feof( $imap_stream ) ) {
	64	$bodystructure .= $read;
77b88425	65	$read = fgets ($imap_stream, 9216);
451f74a2	66	}
451f74a2	67	$read = $bodystructure;
77b88425	68
451f74a2	69	// isolate the body structure and remove beginning and end parenthesis
451f74a2	70	$read = trim(substr ($read, strpos(strtolower($read), 'bodystructure') + 13));
c9d78ab4	71
451f74a2	72	$read = trim(substr ($read, 0, -1));
	73	$end = mime_match_parenthesis(0, $read);
	74	while ($end == strlen($read)-1) {
	75	$read = trim(substr ($read, 0, -1));
	76	$read = trim(substr ($read, 1));
	77	$end = mime_match_parenthesis(0, $read);
	78	}
77b88425	79
451f74a2	80	$msg = mime_parse_structure ($read, 0);
451f74a2	81	$msg->header = $header;
77b88425	82
451f74a2	83	return( $msg );
451f74a2	84	}
b74ba498	85
451f74a2	86	/* this starts the parsing of a particular structure. It is called recursively,
	87	* so it can be passed different structures. It returns an object of type
	88	* $message.
	89	* First, it checks to see if it is a multipart message. If it is, then it
	90	* handles that as it sees is necessary. If it is just a regular entity,
	91	* then it parses it and adds the necessary header information (by calling out
	92	* to mime_get_elements()
	93	*/
	94	function mime_parse_structure ($structure, $ent_id) {
164800ad	95	global $mailbox;
c9d78ab4	96	$properties = array();
451f74a2	97	$msg = new message();
451f74a2	98	if ($structure{0} == '(') {
c9d78ab4	99	$old_ent_id = $ent_id;
451f74a2	100	$ent_id = mime_new_element_level($ent_id);
	101	$start = $end = -1;
	102	do {
	103	$start = $end+1;
	104	$end = mime_match_parenthesis ($start, $structure);
164800ad	105
	106	/* check if we are dealing with a new entity-level */
	107	$i = strrpos($ent_id,'.');
	108	if ($i>0) {
	109	$ent = substr($ent_id, $i+1);
	110	} else {
	111	$ent = '';
	112	}
c9d78ab4	113	/* add "forgotten" parent entities (alternative and relative) */
164800ad	114	if ($ent == '0') {
	115	/* new entity levels have information about the type (type1) and
	116	* the properties. This information is situated at the end of the
	117	* structure string like for example (example between the brackets)
	118	* [ "RELATED" ("BOUNDARY" "myboundary" "TYPE" "plain/html") ]
	119	*/
	120
	121	/* get the involved properties for parsing to mime_get_properties */
	122	$startprop = strrpos($structure,'(');
	123	$properties_str = substr($structure,$startprop);
	124	$endprop = mime_match_parenthesis ($startprop, $structure);
	125	$propstr = substr($structure, $startprop + 1, ($endprop - $startprop)-1);
	126	/* cut off the used properties */
	127	if ($startprop) {
	128	$structure_end = substr($structure, $endprop+2);
	129	$structure = trim(substr($structure,0,$startprop));
	130	}
164800ad	131	/* get type1 */
164800ad	132	$pos = strrpos($structure,' ');
008989da	133	if ($structure{$pos+1} =='(') $pos++;
008989da	134
164800ad	135	$type1 = strtolower(substr($structure, $pos+2, (count($structure)-2)));
164800ad	136	/* cut off type1 */
	137	if ($pos && $startprop) {
	138	$structure = trim(substr($structure, 0, $pos));
	139	}
	140
	141	/* process the found information */
	142	$properties = mime_get_props($properties, $properties_str);
c9d78ab4	143	if (count($properties)>0) {
	144	$msg->header->entity_id = $old_ent_id;
	145	$msg->header->type0 = 'multipart';
	146	$msg->header->type1 = $type1;
164800ad	147	for ($i=0; $i < count($properties); $i++) {
	148	$msg->header->{$properties[$i]['name']} = $properties[$i]['value'];
	149	}
c9d78ab4	150	}
164800ad	151	$structure = $structure . ' ' . $structure_end;
	152	}
	153	$element = substr($structure, $start+1, ($end - $start)-1);
	154	$ent_id = mime_increment_id ($ent_id);
	155	$newmsg = mime_parse_structure ($element, $ent_id);
	156	/* set mailbox in case of message/rfc822 entities */
	157	if (isset($newmsg->header->type0) && isset($newmsg->header->type1)) {
	158	if ($newmsg->header->type0 == 'message' && $newmsg->header->type1 == 'rfc822') {
	159	$newmsg->header->mailbox=$mailbox;
c9d78ab4	160	}
c9d78ab4	161	}
164800ad	162	$msg->addEntity ($newmsg);
451f74a2	163
451f74a2	164	} while ($structure{$end+1} == '(');
	165	} else {
	166	// parse the elements
c9d78ab4	167	$msg = mime_get_element ($structure, $msg, $ent_id);
451f74a2	168	}
	169	return $msg;
	170	}
e4a256af	171
164800ad	172
451f74a2	173	/* Increments the element ID. An element id can look like any of
	174	* the following: 1, 1.2, 4.3.2.4.1, etc. This function increments
	175	* the last number of the element id, changing 1.2 to 1.3.
	176	*/
	177	function mime_increment_id ($id) {
	178
77b88425	179	if (strpos($id, '.')) {
	180	$first = substr($id, 0, strrpos($id, '.'));
	181	$last = substr($id, strrpos($id, '.')+1);
451f74a2	182	$last++;
77b88425	183	$new = $first . '.' .$last;
451f74a2	184	} else {
	185	$new = $id + 1;
	186	}
77b88425	187
451f74a2	188	return $new;
	189	}
	190
	191	/*
	192	* See comment for mime_increment_id().
	193	* This adds another level on to the entity_id changing 1.3 to 1.3.0
	194	* NOTE: 1.3.0 is not a valid element ID. It MUST be incremented
	195	* before it can be used. I left it this way so as not to have
	196	* to make a special case if it is the first entity_id. It
	197	* always increments it, and that works fine.
	198	*/
	199	function mime_new_element_level ($id) {
	200
77b88425	201	if (!$id) {
	202	$id = 0;
	203	} else {
	204	$id = $id . '.0';
	205	}
451f74a2	206
77b88425	207	return( $id );
451f74a2	208	}
	209
	210	function mime_get_element (&$structure, $msg, $ent_id) {
	211
	212	$elem_num = 1;
	213	$msg->header = new msg_header();
	214	$msg->header->entity_id = $ent_id;
	215	$properties = array();
451f74a2	216	while (strlen($structure) > 0) {
	217	$structure = trim($structure);
	218	$char = $structure{0};
	219
	220	if (strtolower(substr($structure, 0, 3)) == 'nil') {
	221	$text = '';
	222	$structure = substr($structure, 3);
	223	} else if ($char == '"') {
	224	// loop through until we find the matching quote, and return that as a string
	225	$pos = 1;
	226	$text = '';
	227	while ( ($char = $structure{$pos} ) <> '"' && $pos < strlen($structure)) {
	228	$text .= $char;
	229	$pos++;
	230	}
	231	$structure = substr($structure, strlen($text) + 2);
795d42e2	232	} else if ($char == '{') {
	233	/**
	234	* loop through until we find the matching quote,
	235	* and return that as a string
	236	*/
	237	$pos = 1;
	238	$len = '';
	239	while (($char = $structure{$pos}) != '}'
	240	&& $pos < strlen($structure)) {
	241	$len .= $char;
	242	$pos++;
	243	}
	244	$structure = substr($structure, strlen($len) + 4);
	245	$text = substr($structure, 0, $len);
	246	$structure = substr($structure, $len + 1);
451f74a2	247	} else if ($char == '(') {
	248	// comment me
	249	$end = mime_match_parenthesis (0, $structure);
	250	$sub = substr($structure, 1, $end-1);
	251	$properties = mime_get_props($properties, $sub);
	252	$structure = substr($structure, strlen($sub) + 2);
	253	} else {
	254	// loop through until we find a space or an end parenthesis
	255	$pos = 0;
	256	$char = $structure{$pos};
	257	$text = '';
	258	while ($char != ' ' && $char != ')' && $pos < strlen($structure)) {
	259	$text .= $char;
	260	$pos++;
	261	$char = $structure{$pos};
	262	}
	263	$structure = substr($structure, strlen($text));
	264	}
	265
	266	// This is where all the text parts get put into the header
	267	switch ($elem_num) {
	268	case 1:
	269	$msg->header->type0 = strtolower($text);
	270	break;
	271	case 2:
	272	$msg->header->type1 = strtolower($text);
	273	break;
	274	case 4: // Id
	275	// Invisimail enclose images with <>
	276	$msg->header->id = str_replace( '<', '', str_replace( '>', '', $text ) );
	277	break;
	278	case 5:
	279	$msg->header->description = $text;
	280	break;
	281	case 6:
	282	$msg->header->encoding = strtolower($text);
	283	break;
	284	case 7:
	285	$msg->header->size = $text;
	286	break;
	287	default:
	288	if ($msg->header->type0 == 'text' && $elem_num == 8) {
	289	// This is a plain text message, so lets get the number of lines
	290	// that it contains.
	291	$msg->header->num_lines = $text;
	292
	293	} else if ($msg->header->type0 == 'message' && $msg->header->type1 == 'rfc822' && $elem_num == 8) {
	294	// This is an encapsulated message, so lets start all over again and
	295	// parse this message adding it on to the existing one.
	296	$structure = trim($structure);
	297	if ( $structure{0} == '(' ) {
	298	$e = mime_match_parenthesis (0, $structure);
	299	$structure = substr($structure, 0, $e);
	300	$structure = substr($structure, 1);
	301	$m = mime_parse_structure($structure, $msg->header->entity_id);
	302
	303	// the following conditional is there to correct a bug that wasn't
	304	// incrementing the entity IDs correctly because of the special case
	305	// that message/rfc822 is. This fixes it fine.
	306	if (substr($structure, 1, 1) != '(')
	307	$m->header->entity_id = mime_increment_id(mime_new_element_level($ent_id));
	308
	309	// Now we'll go through and reformat the results.
	310	if ($m->entities) {
311	for ($i=0; $i < count($m->entities); $i++) {
312	$msg->addEntity($m->entities[$i]);
313	}
314	} else {
315	$msg->addEntity($m);
316	}
317	$structure = "";
318	}
319	}
320	break;
321	}
322	$elem_num++;
323	$text = "";
324	}
325	// loop through the additional properties and put those in the various headers
c9d78ab4	326	for ($i=0; $i < count($properties); $i++) {
	327	$msg->header->{$properties[$i]['name']} = $properties[$i]['value'];
	328	}
451f74a2	329
	330	return $msg;
	331	}
	332
	333	/*
	334	* I did most of the MIME stuff yesterday (June 20, 2000), but I couldn't
	335	* figure out how to do this part, so I decided to go to bed. I woke up
	336	* in the morning and had a flash of insight. I went to the white-board
	337	* and scribbled it out, then spent a bit programming it, and this is the
	338	* result. Nothing complicated, but I think my brain was fried yesterday.
	339	* Funny how that happens some times.
	340	*
	341	* This gets properties in a nested parenthesisized list. For example,
	342	* this would get passed something like: ("attachment" ("filename" "luke.tar.gz"))
	343	* This returns an array called $props with all paired up properties.
	344	* It ignores the "attachment" for now, maybe that should change later
	345	* down the road. In this case, what is returned is:
	346	* $props[0]["name"] = "filename";
	347	* $props[0]["value"] = "luke.tar.gz";
	348	*/
	349	function mime_get_props ($props, $structure) {
	350
	351	while (strlen($structure) > 0) {
	352	$structure = trim($structure);
	353	$char = $structure{0};
451f74a2	354	if ($char == '"') {
	355	$pos = 1;
	356	$tmp = '';
	357	while ( ( $char = $structure{$pos} ) != '"' &&
	358	$pos < strlen($structure)) {
	359	$tmp .= $char;
	360	$pos++;
	361	}
	362	$structure = trim(substr($structure, strlen($tmp) + 2));
	363	$char = $structure{0};
	364
	365	if ($char == '"') {
	366	$pos = 1;
	367	$value = '';
	368	while ( ( $char = $structure{$pos} ) != '"' &&
	369	$pos < strlen($structure) ) {
	370	$value .= $char;
	371	$pos++;
	372	}
c9d78ab4	373	$structure = trim(substr($structure, strlen($value) + 2));
451f74a2	374	$k = count($props);
	375	$props[$k]['name'] = strtolower($tmp);
	376	$props[$k]['value'] = $value;
c9d78ab4	377	if ($structure != '') {
	378	mime_get_props($props, $structure);
	379	} else {
	380	return $props;
	381	}
451f74a2	382	} else if ($char == '(') {
	383	$end = mime_match_parenthesis (0, $structure);
	384	$sub = substr($structure, 1, $end-1);
c9d78ab4	385	if (! isset($props))
	386	$props = array();
	387	$props = mime_get_props($props, $sub);
	388	$structure = substr($structure, strlen($sub) + 2);
	389	return $props;
451f74a2	390	}
451f74a2	391	} else if ($char == '(') {
	392	$end = mime_match_parenthesis (0, $structure);
	393	$sub = substr($structure, 1, $end-1);
	394	$props = mime_get_props($props, $sub);
	395	$structure = substr($structure, strlen($sub) + 2);
	396	return $props;
	397	} else {
	398	return $props;
	399	}
	400	}
	401	}
	402
	403	/*
	404	* Matches parenthesis. It will return the position of the matching
	405	* parenthesis in $structure. For instance, if $structure was:
	406	* ("text" "plain" ("val1name", "1") nil ... )
	407	* x x
	408	* then this would return 42 to match up those two.
	409	*/
	410	function mime_match_parenthesis ($pos, $structure) {
	411
	412	$j = strlen( $structure );
	413
	414	// ignore all extra characters
	415	// If inside of a string, skip string -- Boundary IDs and other
	416	// things can have ) in them.
	417	if ( $structure{$pos} != '(' ) {
	418	return( $j );
	419	}
	420
	421	while ( $pos < $j ) {
	422	$pos++;
	423	if ($structure{$pos} == ')') {
8beafbbc	424	return $pos;
451f74a2	425	} elseif ($structure{$pos} == '"') {
b74ba498	426	$pos++;
451f74a2	427	while ( $structure{$pos} != '"' &&
	428	$pos < $j ) {
	429	if (substr($structure, $pos, 2) == '\\"') {
b74ba498	430	$pos++;
451f74a2	431	} elseif (substr($structure, $pos, 2) == '\\\\') {
b74ba498	432	$pos++;
451f74a2	433	}
b74ba498	434	$pos++;
5ffe5a7e	435	}
451f74a2	436	} elseif ( $structure{$pos} == '(' ) {
8beafbbc	437	$pos = mime_match_parenthesis ($pos, $structure);
451f74a2	438	}
	439	}
	440	echo _("Error decoding mime structure. Report this as a bug!") . '<br>';
	441	return( $pos );
	442	}
	443
93f92f03	444	function mime_fetch_body($imap_stream, $id, $ent_id) {
09a4bde3	445
	446	/*
	447	* do a bit of error correction. If we couldn't find the entity id, just guess
	448	* that it is the first one. That is usually the case anyway.
	449	*/
	450	if (!$ent_id) {
451f74a2	451	$ent_id = 1;
09a4bde3	452	}
6ab1bd9e	453	$cmd = "FETCH $id BODY[$ent_id]";
77b88425	454
93f92f03	455	$data = sqimap_run_command ($imap_stream, $cmd, true, $response, $message);
77b88425	456	do {
e976319c	457	$topline = trim(array_shift( $data ));
e976319c	458	} while( $topline && $topline[0] == '' && !preg_match( '/\ [0-9]+ FETCH.*/i', $topline )) ;
451f74a2	459	$wholemessage = implode('', $data);
451f74a2	460	if (ereg('\\{([^\\}]*)\\}', $topline, $regs)) {
77b88425	461
451f74a2	462	$ret = substr( $wholemessage, 0, $regs[1] );
	463	/*
	464	There is some information in the content info header that could be important
	465	in order to parse html messages. Let's get them here.
	466	*/
	467	if ( $ret{0} == '<' ) {
1c72b151	468	$data = sqimap_run_command ($imap_stream, "FETCH $id BODY[$ent_id.MIME]", true, $response, $message);
e5ea9327	469	/* BASE within HTML documents is illegal (see w3 spec)
	470	* $base = '';
	471	* $k = 10;
	472	* foreach( $data as $d ) {
	473	* if ( substr( $d, 0, 13 ) == 'Content-Base:' ) {
	474	* $j = strlen( $d );
	475	* $i = 13;
	476	* $base = '';
	477	* while ( $i < $j &&
	478	* ( !isNoSep( $d{$i} ) \|\| $d{$i} == '"' ) )
	479	* $i++;
	480	* while ( $i < $j ) {
	481	* if ( isNoSep( $d{$i} ) )
	482	* $base .= $d{$i};
	483	* $i++;
	484	* }
	485	* $k = 0;
	486	* } elseif ( $k == 1 && !isnosep( $d{0} ) ) {
	487	* $base .= substr( $d, 1 );
	488	* }
	489	* $k++;
	490	* }
	491	* if ( $base <> '' ) {
	492	* $ret = "<base href=\"$base\">" . $ret;
	493	* }
7e235a1a	494	* */
451f74a2	495	}
	496	} else if (ereg('"([^"]*)"', $topline, $regs)) {
	497	$ret = $regs[1];
	498	} else {
	499	global $where, $what, $mailbox, $passed_id, $startMessage;
e5ea9327	500	$par = 'mailbox=' . urlencode($mailbox) . "&passed_id=$passed_id";
451f74a2	501	if (isset($where) && isset($what)) {
e5ea9327	502	$par .= '&where='. urlencode($where) . "&what=" . urlencode($what);
a3daaaf3	503	} else {
e5ea9327	504	$par .= "&startMessage=$startMessage&show_more=0";
451f74a2	505	}
e5ea9327	506	$par .= '&response=' . urlencode($response) .
	507	'&message=' . urlencode($message).
	508	'&topline=' . urlencode($topline);
a019eeb8	509
346817d4	510	echo '<tt><br>' .
	511	'<table width="80%"><tr>' .
	512	'<tr><td colspan=2>' .
451f74a2	513	_("Body retrieval error. The reason for this is most probably that the message is malformed. Please help us making future versions better by submitting this message to the developers knowledgebase!") .
346817d4	514	" <A HREF=\"../src/retrievalerror.php?$par\"><br>" .
	515	_("Submit message") . '</A><BR> ' .
	516	'</td></tr>' .
	517	'<td><b>' . _("Command:") . "</td><td>$cmd</td></tr>" .
	518	'<td><b>' . _("Response:") . "</td><td>$response</td></tr>" .
	519	'<td><b>' . _("Message:") . "</td><td>$message</td></tr>" .
	520	'<td><b>' . _("FETCH line:") . "</td><td>$topline</td></tr>" .
	521	"</table><BR></tt></font><hr>";
	522
1c72b151	523	$data = sqimap_run_command ($imap_stream, "FETCH $passed_id BODY[]", true, $response, $message);
451f74a2	524	array_shift($data);
451f74a2	525	$wholemessage = implode('', $data);
a019eeb8	526
346817d4	527	$ret = $wholemessage;
a3daaaf3	528	}
451f74a2	529	return( $ret );
451f74a2	530	}
d4467150	531
451f74a2	532	function mime_print_body_lines ($imap_stream, $id, $ent_id, $encoding) {
	533	// do a bit of error correction. If we couldn't find the entity id, just guess
	534	// that it is the first one. That is usually the case anyway.
	535	if (!$ent_id) {
	536	$ent_id = 1;
	537	}
	538	$sid = sqimap_session_id();
	539	// Don't kill the connection if the browser is over a dialup
	540	// and it would take over 30 seconds to download it.
b7206e1d	541
	542