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pa_vmail.C

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/**   @file
      Parser: @b mail class.
      relies on gmime library, by Jeffrey Stedfast <fejj@helixcode.com>

      Copyright(c) 2001-2005 ArtLebedev Group(http://www.artlebedev.com)
      Author: Alexandr Petrosian <paf@design.ru>(http://paf.design.ru)
*/

static const char * const IDENT_VMAIL_C="$Date: 2008-02-21 13:13:28 $";

#include "pa_sapi.h"
#include "pa_vmail.h"
#include "pa_vstring.h"
#include "pa_request.h"
#include "pa_common.h"
#include "pa_charset.h"
#include "pa_charsets.h"
#include "pa_vdate.h"
#include "pa_vfile.h"
#include "pa_uue.h"

#ifdef WITH_MAILRECEIVE
extern "C" {
#include "gmime.h"
}

#include "pa_charsets.h"
#endif

// defines

#define RAW_NAME "raw"

// internals

enum PartType {
      P_TEXT,
      P_HTML,
      P_FILE,
      P_MESSAGE,

      P_TYPES_COUNT
};

static const char* const part_name_begins[P_TYPES_COUNT]={"text", "html", "file", "message"};

// defines for statics

#define FORMAT_NAME "format"
#define CHARSET_NAME "charset"
#define CID_NAME "content-id"

// statics

static const String format_name(FORMAT_NAME);
static const String charset_name(CHARSET_NAME);
static const String cid_name(CID_NAME);

// consts

const int MAX_CHARS_IN_HEADER_LINE=500;

// VMail

extern Methoded* mail_base_class;

VMail::VMail(): VStateless_class(0, mail_base_class) {}

#ifdef WITH_MAILRECEIVE

#define EXCEPTION_VALUE "x-exception"

static const String& maybeUpperCase(Charset& source_charset, 
                            const String& src, bool toUpperCase) {
      return toUpperCase?src.change_case(source_charset, String::CC_UPPER):src;
}

static void putReceived(Charset& source_charset, 
                  HashStringValue& received, 
                  const char* must_clone_name, Value* value, 
                  bool nameToUpperCase=false) {

      if(must_clone_name && value) {
            received.put(
                  maybeUpperCase(source_charset, 
                        *new String(pa_strdup(must_clone_name)), nameToUpperCase),
                  value);
      }
}

static void putReceived(Charset& source_charset, 
                  HashStringValue& received, 
                  const char* must_clone_name, const char* must_clone_value, 
                  bool nameToUpperCase=false) {
      if(must_clone_name && must_clone_value) {

            String::C must_clone_value_cstr(must_clone_value, strlen(must_clone_value));
            //must_clone_value_cstr=Charset::transcode(must_clone_value_cstr, UTF8_charset, source_charset);

            putReceived(source_charset,
                  received, 
                  pa_strdup(must_clone_name), 
                  new VString(*new String(pa_strdup(must_clone_value_cstr.str))),
                  nameToUpperCase
            );
      }
}

static void putReceived(HashStringValue& received, const char* must_clone_name, time_t value) {
      if(must_clone_name)
            received.put(
                  String::Body(pa_strdup(must_clone_name)), 
                  new VDate(value)
            );
}

#ifndef DOXYGEN
struct MimeHeaderField2received_info {
      Charset* source_charset;
      HashStringValue* received;
};
#endif
static void MimeHeaderField2received(const char* must_clone_name, const char* must_clone_value, gpointer data) {
      MimeHeaderField2received_info& info=*static_cast<MimeHeaderField2received_info *>(data);

      putReceived(*info.source_charset, 
            *info.received, 
            must_clone_name, must_clone_value, true/*nameInUpperCase*/);
}

static void parse(Request& r, GMimeStream *stream, HashStringValue& received);

#ifndef DOXYGEN
struct MimePart2body_info {
      Request* r;
      HashStringValue* body;
      int partCounts[P_TYPES_COUNT];
};
#endif
static void MimePart2body(GMimePart *part, gpointer data) {
      MimePart2body_info& info=*static_cast<MimePart2body_info *>(data);
      Charset& source_charset=info.r->charsets.source();

      if(const GMimeContentType *type=g_mime_part_get_content_type(part)) {
            if(g_mime_content_type_is_type(type, "multipart", "*"))
                  return; // skipping frames

            PartType partType;
            if(part->disposition) // inline/attachment
                  partType=P_FILE;
            else if(g_mime_content_type_is_type(type, "text", "plain"))
                  partType=P_TEXT;
            else if(g_mime_content_type_is_type(type, "text", "html"))
                  partType=P_HTML;
            else if(g_mime_content_type_is_type(type, "message", "*"))
                  partType=P_MESSAGE;
            else
                  partType=P_FILE;
            
            // partName
            const char* partNameNumbered;
            char partNameBuf[MAX_STRING];
            const char* partNameStart=part_name_begins[partType];
            int partNo=++info.partCounts[partType];
            snprintf(partNameBuf, MAX_STRING, "%s%d", partNameStart, partNo);
            partNameNumbered=partNameBuf;
            
            // $.partX[ 
            VHash* vpartX(new VHash);  
            putReceived(source_charset, *info.body, partNameNumbered, vpartX);
            if(partNo==1)
                  putReceived(source_charset, *info.body, partNameStart, vpartX);
                  
            HashStringValue& partX=vpartX->hash();
            {
                  // $.raw[
                  VHash* vraw(new VHash);  putReceived(source_charset, partX, RAW_NAME, vraw);
                  MimeHeaderField2received_info hfr_info={&source_charset, &vraw->hash()};
                  g_mime_header_foreach(part->headers, MimeHeaderField2received, &hfr_info);
            }
            const char* content_filename=0;
            {
                  // $.content-type[ 
                  VHash* vcontent_type(new VHash);  putReceived(source_charset, partX, "content-type", vcontent_type);
                  HashStringValue& content_type=vcontent_type->hash(); 
                  {
                        // $.value[text/plain] 
                        char value[MAX_STRING];
                        snprintf(value, MAX_STRING, "%s/%s", 
                              type->type?type->type:"x-unknown",
                              type->subtype?type->subtype:"x-unknown");
                        putReceived(source_charset, content_type, VALUE_NAME, value);
                  }
                  GMimeParam *param=type->params;
                  while(param) {
                        // $.charset[windows-1251]  && co
                        putReceived(source_charset, content_type, param->name, param->value, true);
                        if(strcasecmp(param->name, "name")==0)
                              content_filename=param->value;
                        param=param->next;
                  }
            }
            // $.description
            putReceived(source_charset, partX, "description", part->description);
            // $.content-id
            putReceived(source_charset, partX, "content-id", part->content_id);
            // $.content-md5
            putReceived(source_charset, partX, "content-md5", part->content_md5);
            // $.content-location
            putReceived(source_charset, partX, "content-location", part->content_location);
            
            // todo GMimePart:
            //   GMimePartEncodingType encoding;
            //   GMimeDisposition *disposition;
            if(part->disposition) {
                  GMimeParam *param=part->disposition->params;
                  while(param) {
                        // $.charset[windows-1251]  && co
                        if(strcasecmp(param->name, "filename")==0)
                              content_filename=param->value;
                        param=param->next;
                  }
            }

            // MESSAGE
            if(partType==P_MESSAGE) {
                  if(part->content)
                        if(GMimeStream *stream=part->content->stream)
                              parse(*info.r, stream, partX);
            } else {
                  // $.value[string|file]
                  size_t buf_len;
                  const char* local_buf=(const char*)g_mime_part_get_content(part, &buf_len);
                  if(partType==P_FILE) {
                        VFile* vfile(new VFile);
                        char *pooled_buf=pa_strdup(local_buf, buf_len);
                        VString* vcontent_type=content_filename?
                              new VString(info.r->mime_type_of(content_filename)):0;
                        vfile->set(true/*tainted*/, pooled_buf, buf_len, content_filename, vcontent_type);
                        putReceived(source_charset, partX, VALUE_NAME, vfile);
                  } else {
                        // P_TEXT, P_HTML
                        putReceived(source_charset, partX, VALUE_NAME,(const char*)local_buf);
                  }
            }
      }
}

int gmt_offset() {
#if defined(HAVE_TIMEZONE) && defined(HAVE_DAYLIGHT)
      return timezone+(daylight?60*60*(timezone<0?-1:timezone>0?+1:0):0);
#else
      time_t t=time(0);
      tm *tm=localtime(&t);
#if defined(HAVE_TM_GMTOFF)
      return tm->tm_gmtoff;
#elif defined(HAVE_TM_TZADJ)
      return tm->tm_tzadj;
#else
#error neither HAVE_TIMEZONE&HAVE_DAYIGHT nor HAVE_TM_GMTOFF nor HAVE_TM_TZADJ defined
#endif
#endif
}

static void parse(Request& r, GMimeStream *stream, HashStringValue& received) {
      Charset& source_charset=r.charsets.source();

      GMimeMessage *message=g_mime_parser_construct_message(stream);
      try {
            const GMimeMessageHeader *messageHeader=message->header;
            if(!messageHeader)
                  return;

            // firstly user-defined strings go
            //  user headers
            {
                  // $.raw[
                  VHash* vraw(new VHash);  putReceived(source_charset, received, RAW_NAME, vraw);
                  MimeHeaderField2received_info hfr_info={&source_charset, &vraw->hash()};
                  g_mime_header_foreach(messageHeader->headers, MimeHeaderField2received, &hfr_info);
            }

            // maybe-todo-recipients
            // x(messageHeader->recipients)

            //  secondly standard headers&body go
            //  standard header
            // .from
            putReceived(source_charset, received, "from", messageHeader->from);
            // .reply-to
            putReceived(source_charset, received, "reply-to", messageHeader->reply_to);
            // .to
            // todo: messageHeader->recipients
            // .subject
            putReceived(source_charset, received, "subject", messageHeader->subject);
            // .date(date+gmt_offset)
            int tt_offset = 
                  ((messageHeader->gmt_offset / 100) *(60 * 60)) 
                  +(messageHeader->gmt_offset % 100) * 60;              

            putReceived(received, "date", 
                  messageHeader->date // local sender
                  -tt_offset // move local sender to GMT sender
                  -gmt_offset() // move GMT sender to our local time
            );
            // .message-id
            putReceived(source_charset, received, "message-id", messageHeader->message_id);

            // .body[part/parts
            GMimePart *part=message->mime_part;
            MimePart2body_info info={&r, &received, {0}};
            g_mime_part_foreach(part, MimePart2body, &info);

            // normal unref
            g_mime_object_unref(GMIME_OBJECT(message));
      } catch(const Exception& e) {
            // abnormal unref
            g_mime_object_unref(GMIME_OBJECT(message));
            putReceived(source_charset, received, VALUE_NAME, "<exception occured while parsing message>");
            putReceived(source_charset, received, EXCEPTION_VALUE, e.comment());
      } catch(...) {
            // abnormal unref
            g_mime_object_unref(GMIME_OBJECT(message));
            putReceived(source_charset, received, VALUE_NAME, "<exception occured while parsing message>");
      }
}
#endif



void VMail::fill_received(Request& 
#ifdef WITH_MAILRECEIVE
                                      r
#endif
                                      ) {
      // store letter to received
#ifdef WITH_MAILRECEIVE
      if(r.request_info.mail_received) {
            // init
            g_mime_init(0);
            //    g_mime_init(GMIME_INIT_FLAG_UTF8);

            // create stream with CRLF filter
            GMimeStream *stream = g_mime_stream_fs_new(fileno(stdin));
            GMimeStream *istream = g_mime_stream_filter_new_with_stream(stream);
            GMimeFilter *filter = g_mime_filter_crlf_new(GMIME_FILTER_CRLF_DECODE, GMIME_FILTER_CRLF_MODE_CRLF_ONLY);
            g_mime_stream_filter_add(GMIME_STREAM_FILTER(istream), filter);
            g_mime_stream_unref(stream);
            stream = istream;
            try {
                  // parse incoming stream
                  parse(r, stream, vreceived.hash());
                  // normal stream free 
                  g_mime_stream_unref(stream);
            } catch(const Exception& e) {
                  // abnormal stream free 
                  g_mime_stream_unref(stream);
                  Charset& source_charset=r.charsets.source();
                  HashStringValue& received=vreceived.hash();
                  putReceived(source_charset, received, VALUE_NAME, "<exception occured while parsing messages>");
                  putReceived(source_charset, received, EXCEPTION_VALUE, e.comment());
            } catch(...) {
                  // abnormal stream free 
                  g_mime_stream_unref(stream);
                  rethrow;
            }
      }
#endif
}

typedef int (*string_contains_char_which_check)(int);
static bool string_contains_char_which(const char* string, string_contains_char_which_check check) {
      while(char c=*string++) {
            if(check((unsigned char)c))
                  return true;
      }
      return false;
}
static char *trimBoth(char *s) {
      // sanity check
      if(!s)
            return 0;

      // trim head whitespace
      while(*s && isspace((unsigned char)*s))
            s++;
      // trim tail whitespace
      char *tail=s+strlen(s);
      if(tail>s) {
            do {
                  --tail;
                  if(isspace((unsigned char)*tail))
                        *tail=0;
            } while(tail>s);
      }
      // return it
      return s;
}
static void extractEmail(String& result, char *email) {
      email=trimBoth(email);
      result.append_help_length(email, 0, String::L_TAINTED);

      /*
            http://www.faqs.org/rfcs/rfc822.html

            addr-spec   =  local-part "@" domain        ; global address
      
            local-part  =  word *("." word)             ; uninterpreted case-preserved
            word        =  atom / quoted-string

            domain      =  sub-domain *("." sub-domain)
            sub-domain  =  domain-ref / domain-literal
            domain-ref  =  atom                         ; symbolic reference

        domain-literal << ignoring for now
            quoted-string in word << ignoring for now

            atom        =  1*<any CHAR except specials, SPACE and CTLs>  << the ONLY to check

            specials    =  "(" / ")" / "<" / ">" / "@"  ; Must be in quoted-
                 /  "," / ";" / ":" / "\" / <">  ;  string, to use
                 /  "." / "[" / "]"              ;  within a word.

      */
      const char* exception_type="email.format";
      if(strpbrk(email, "()<>,;:\\\"[]"/*specials minus @ and . */))
            throw Exception(exception_type,
                  &result,
                  "email contains bad characters (specials)");
      if(string_contains_char_which(email, (string_contains_char_which_check)isspace))
            throw Exception(exception_type,
                  &result,
                  "email contains bad characters (whitespace)");
      if(string_contains_char_which(email, (string_contains_char_which_check)iscntrl))
            throw Exception(exception_type,
                  &result,
                  "email contains bad characters (control)");
      if(result.is_empty())
            throw Exception(exception_type,
                  0,
                  "email is empty");
}

static const String& extractEmails(const String& string) {
      char *emails=string.cstrm();
      String& result=*new String;
      while(char *email=lsplit(&emails, ',')) {
            rsplit(email, '>');
            if(char *in_brackets=lsplit(email, '<'))
                  email=in_brackets;
            if(!result.is_empty())
                  result<<",";
            extractEmail(result, email);
      }

      return result;
}

#ifndef DOXYGEN
struct Store_message_element_info {
      Request_charsets& charsets;
      String& header;
      const String* & from;
      bool extract_to; String* & to;
      const String* errors_to;
      bool mime_version_specified;
      ArrayValue* parts[P_TYPES_COUNT];
      int parts_count;
      bool backward_compatibility;
      Value* content_type;
      bool had_content_disposition;

      Store_message_element_info(
            Request_charsets& acharsets,
            String& aheader,
            const String* & afrom,
            bool aextract_to, String* & ato
            ):
            
            charsets(acharsets),
            header(aheader),
            from(afrom),
            extract_to(aextract_to), to(ato),
            errors_to(0),
            mime_version_specified(false),
            parts_count(0),
            backward_compatibility(false), content_type(0),
            had_content_disposition(false){
      }
};
#endif
static void store_message_element(HashStringValue::key_type raw_element_name, 
                          HashStringValue::value_type element_value, 
                          Store_message_element_info *info) {
      const String& low_element_name=String(raw_element_name, String::L_TAINTED).change_case(
            info->charsets.source(), String::CC_LOWER);

      // exclude internals
      if(low_element_name==MAIL_OPTIONS_NAME
            || low_element_name==CHARSET_NAME
            || low_element_name==VALUE_NAME
            || low_element_name==RAW_NAME
            || low_element_name==FORMAT_NAME
            || low_element_name==NAME_NAME
            || low_element_name==CID_NAME)
            return;

      // grep parts
      for(int pt=0; pt<P_TYPES_COUNT; pt++) {
            if(low_element_name.starts_with(part_name_begins[pt])) {
                  // check that $.message# '#' is digit
                  size_t start_len=strlen(part_name_begins[pt]);
                  if(low_element_name.length()>start_len) {
                        const char* at_num=low_element_name.mid(start_len, start_len+1).cstr();
                        if(!isdigit((unsigned char)*at_num))
                              continue;
                  }
                  *info->parts[pt]+=element_value;
                  info->parts_count++;
                  return;
            }
      }

      // fetch some special headers
      if(low_element_name=="from")
            info->from=&extractEmails(element_value->as_string());
      if(low_element_name==CONTENT_DISPOSITION_NAME)
            info->had_content_disposition=true;
      if(info->extract_to) { // defined only when SMTP used, see mail.C [collecting info for RCPT to-s]
            bool is_to=low_element_name=="to" ;
            bool is_cc=low_element_name=="cc" ;
            bool is_bcc=low_element_name=="bcc" ;
            if(is_to||is_cc||is_bcc) {
                  if(!info->to)
                        info->to=new String;
                  else
                        *info->to << ",";
                  *info->to << extractEmails(element_value->as_string());
            }

            if(is_bcc) // blinding it
                  return;
      }
      if(low_element_name=="errors-to")
            info->errors_to=&extractEmails(element_value->as_string()); 
      if(low_element_name=="mime-version")
            info->mime_version_specified=true;

      // has content type?
      if(low_element_name==CONTENT_TYPE_NAME) {
            info->content_type=element_value;
            if(info->backward_compatibility)
                  return;
      }

      // preparing header line
      const String& source_line=attributed_meaning_to_string(*element_value,
            String::L_PASS_APPENDED/*does not matter, would cstr(AS_IS) right away*/);
      if(source_line.is_empty())
            return; // we don't need empty headers here [used in clearing content-disposition]

      const char* source_line_cstr=source_line.cstr();
      String::C mail=Charset::transcode(
            String::C(source_line_cstr, source_line.length()),
            info->charsets.source(), 
            info->charsets.mail());
      String& mail_line=*new String;
      if(low_element_name=="to"
            || low_element_name=="cc" 
            || low_element_name=="bcc") 
      {
            // never wrap address lines, mailer can not handle wrapped properly
            mail_line.append_strdup(mail.str, mail.length, String::L_MAIL_HEADER);
      } else {
            while(mail.length) {
                  bool too_long=mail.length>MAX_CHARS_IN_HEADER_LINE;
                  size_t length=too_long
                        ? MAX_CHARS_IN_HEADER_LINE
                        : mail.length;

                  mail_line.append_strdup(mail.str, length, String::L_MAIL_HEADER);
                  mail.length-=length;

                  if(too_long)
                        mail_line << "\n "; // break header and continue it on next line
            }     
      }

      // append header line
      info->header 
            << raw_element_name 
            << ":" << mail_line.cstr(String::L_UNSPECIFIED, 0, &info->charsets)
            << "\n";
}

static const String& file_value_to_string(Request& r, Value* send_value) {
      String& result=*new String;

      VFile* vfile;
      const String* file_name=0;
      Value* vformat=0;
      Value* vcid=0;
      const String* dummy_from;
      String* dummy_to;
      Store_message_element_info info(r.charsets, 
            result, dummy_from, false, dummy_to);
      if(HashStringValue *send_hash=send_value->get_hash()) { // hash
            send_hash->for_each<Store_message_element_info*>(store_message_element, &info);

            // $.value
            if(Value* value=send_hash->get(value_name))
                  vfile=value->as_vfile(String::L_UNSPECIFIED);
            else
                  throw Exception(PARSER_RUNTIME,
                        0,
                        "file part has no $value");

            // $.format
            vformat=send_hash->get(format_name);

            // $.content-id
            vcid=send_hash->get(cid_name);

            // $.name
            if(Value* vfile_name=send_hash->get(name_name)) // $name specified 
                  file_name=&vfile_name->as_string();
      } else  // must be VFile then
            vfile=send_value->as_vfile(String::L_AS_IS);

      if(!file_name)
            file_name=&vfile->fields().get(name_name)->as_string();

      const char* file_name_cstr=file_name->cstr();

      // content-type: application/octet-stream
      result << CONTENT_TYPE_NAME ": " << r.mime_type_of(file_name_cstr) << "; name=\"" << file_name_cstr << "\"\n";

      if(!info.had_content_disposition) {
            // $.content-disposition wasn't specified
            result
                  << CONTENT_DISPOSITION_NAME ": "
                  << ( vcid ? CONTENT_DISPOSITION_INLINE : CONTENT_DISPOSITION_ATTACHMENT )
                  << "; "
                  << CONTENT_DISPOSITION_FILENAME_NAME"=\"" << file_name_cstr << "\"\n";
      }

      if(vcid)
            result << CID_NAME ": <" << vcid->as_string() << ">\n"; // todo: value must be escaped as %hh

      const String* type=vformat?&vformat->as_string():0;
      if(!type/*default = uue*/ || *type=="uue") {
            result << CONTENT_TRANSFER_ENCODING_NAME ": x-uuencode\n" << "\n";
            pa_uuencode(result, *file_name, *vfile);
      } else {
            if(*type=="base64") {
                  result << CONTENT_TRANSFER_ENCODING_NAME ": base64\n" << "\n";
                  result << pa_base64_encode(vfile->value_ptr(), vfile->value_size());
            } else {
                  // for now
                  throw Exception(PARSER_RUNTIME,
                        type,
                        "unknown attachment encode format");
            }
      }
      
      return result;
}

00669 static const String& text_value_to_string(Request& r,
                                PartType pt, Value* send_value,
                                Store_message_element_info& info) {
      String& result=*new String;

      Value* text_value;
      Value* content_transfer_encoding=0;
      if(HashStringValue* send_hash=send_value->get_hash()) {
            // $.USER-HEADERS
            info.content_type=0; info.backward_compatibility=false; // reset
            send_hash->for_each<Store_message_element_info*>(store_message_element, &info);
            // $.value
            text_value=send_hash->get(value_name);
            if(!text_value)
                  throw Exception(PARSER_RUNTIME,
                        0,
                        "%s part has no $" VALUE_NAME, part_name_begins[pt]);
            content_transfer_encoding=send_hash->get(content_transfer_encoding_name);
      } else
            text_value=send_value;

      if(!info.content_type) {
            result 
                  << CONTENT_TYPE_NAME ": text/" << (pt==P_TEXT?"plain":"html")
                  << "; charset=" << info.charsets.mail().NAME()
                  << "\n";
      }
      if(!content_transfer_encoding)
            result << CONTENT_TRANSFER_ENCODING_NAME << ": 8bit\n";

      // header|body separator
      result << "\n"; 

      // body
      const String* body;
      switch(pt) {
      case P_TEXT:
            body=&text_value->as_string();
            break;
      case P_HTML: 
            {
                  Temp_lang temp_lang(r, String::Language(String::L_HTML | String::L_OPTIMIZE_BIT));
                  if(text_value->get_junction())
                        body=&r.process_to_string(*text_value);
                  else {
                        throw Exception(PARSER_RUNTIME,
                              0,
                              "html part value must be code");
                  }

                  break;
            }
      default:
            throw Exception(0,
                  0,
                  "unhandled part type #%d", pt);
      }
      if(body) {
            Request_charsets charsets(r.charsets.source(), r.charsets.mail()/*uri!*/, r.charsets.mail());
            const char* body_cstr=strdup(body->cstr(String::L_UNSPECIFIED, 0, &charsets));  // body
            String::C mail=Charset::transcode(
                  String::C(body_cstr, strlen(body_cstr)),
                  r.charsets.source(),
                  r.charsets.mail()/*always set - either mail.charset or $request:charset*/);
            ///@todo
            result.append_know_length(mail.str, mail.length, String::L_CLEAN);
      }

      return result;
};

/// @todo files and messages in order (file, file2, ...)
00741 const String& VMail::message_hash_to_string(Request& r,
                                  HashStringValue* message_hash, int level, 
                                  const String* & from, bool extract_to, String* & to) {
      
      if(!message_hash)
            throw Exception(PARSER_RUNTIME,
                  0,
                  "message must be hash");

      String& result=*new String;

      if(Value* vrecodecharset_name=message_hash->get(charset_name))
            r.charsets.set_mail(charsets.get(vrecodecharset_name->as_string()
                  .change_case(r.charsets.source(), String::CC_UPPER)));
      else
            r.charsets.set_mail(r.charsets.source());
      // no big deal that we leave it set. they wont miss this point which would reset it

      Store_message_element_info info(r.charsets, 
            result, from, extract_to, to);
      {
            // for backward compatibilyty $.body+$.content-type -> 
            // $.text[$.value[] $.content-type[]]

            for(int pt=0; pt<P_TYPES_COUNT; pt++)
                  info.parts[pt]=new ArrayValue(1);

            Value* body=message_hash->get("body");
            if(body) {
                  message_hash->remove("body");
                  info.backward_compatibility=true;
            }           
            message_hash->for_each<Store_message_element_info*>(store_message_element, &info);

            if(body) {
                  VHash& text_part=*new VHash(); 
                  HashStringValue& hash=text_part.hash();
                  hash.put(value_name, body);
                  if(info.content_type)
                        hash.put(content_type_name, info.content_type);
                  
                  *info.parts[P_TEXT]+=&text_part;
                  info.parts_count++;
            }

            if(!info.errors_to)
                  result << "errors-to: postmaster\n"; // errors-to: default
            if(!info.mime_version_specified)
                  result << "MIME-Version: 1.0\n"; // MIME-Version: default
      }

      int textCount=info.parts[P_TEXT]->count();
      if(textCount>1)
            throw Exception(PARSER_RUNTIME,
                  0,
                  "multiple text parts not supported, use file part");
      int htmlCount=info.parts[P_HTML]->count();
      if(htmlCount>1)
            throw Exception(PARSER_RUNTIME,
                  0,
                  "multiple html parts not supported, use file part");


      bool multipart=info.parts_count>1;
      bool alternative=textCount && htmlCount;
      // header
      char *boundary=0;
      if(multipart) {
            boundary=new(PointerFreeGC) char[MAX_NUMBER];
            snprintf(boundary, MAX_NUMBER-5/*lEvEl*/, "lEvEl%d", level);

            bool is_inline = false;
            {
                  ArrayValue& files=*info.parts[P_FILE];
                  for(size_t i=0; i<files.count(); i++) {
                        HashStringValue* file;
                        if((file=files.get(i)->get_hash()) && file->get(cid_name)){
                              is_inline = true;
                              break;
                        }
                  }
            }
            
            result << CONTENT_TYPE_NAME ": " << ( is_inline ? "multipart/related;" : "multipart/mixed;" );

            // multi-part
            result 
                   << " boundary=\"" << boundary << "\"\n"
                        "\n"
                        "This is a multi-part message in MIME format.";
      }

      // alternative or not
      {
            if(alternative) {
                  result << "\n\n--" << boundary << "\n" // intermediate boundary
                        CONTENT_TYPE_NAME ": multipart/alternative; boundary=\"ALT" << boundary << "\"\n";
            } 
            for(int i=0; i<2; i++) {
                  PartType pt=i==0?P_TEXT:P_HTML;
                  if(info.parts[pt]->count()) {
                        if(alternative)
                              result << "\n\n--ALT" << boundary << "\n"; // intermediate boundary
                        else if(boundary)
                              result << "\n\n--" << boundary << "\n";  // intermediate boundary
                        result << text_value_to_string(r, pt, info.parts[pt]->get(0), info);
                  }
            }
            if(alternative)
                  result << "\n\n--ALT" << boundary << "--\n";
      }

      // files
      {
            ArrayValue& files=*info.parts[P_FILE];
            for(size_t i=0; i<files.count(); i++) {
                  if(boundary)
                        result << "\n\n--" << boundary << "\n";  // intermediate boundary
                  result << file_value_to_string(r, files.get(i));
            }
      }

      // messages
      {
            ArrayValue& messages=*info.parts[P_MESSAGE];
            for(size_t i=0; i<messages.count(); i++) {
                  if(boundary)
                        result << "\n\n--" << boundary << "\n";  // intermediate boundary
                  
                  const String* dummy_from;
                  String* dummy_to;
                  result << message_hash_to_string(r, messages.get(i)->get_hash(), level+1,
                        dummy_from, false, dummy_to);
            }
      }
      
      // tailer
      if(boundary)
            result << "\n\n--" << boundary << "--\n"; // finish boundary

      // return
      return result;
}


00886 Value* VMail::get_element(const String& aname, Value& aself, bool looking_up) {
      // $fields
#ifdef WITH_MAILRECEIVE
      if(aname==MAIL_RECEIVED_ELEMENT_NAME)
            return &vreceived;
#endif

      // $CLASS,$method
      if(Value* result=VStateless_class::get_element(aname, aself, looking_up))
            return result;

      return 0;
}

#if defined(WITH_MAILRECEIVE) && defined(_MSC_VER)
#     define GNOME_LIBS "../../../../win32/gnome"
#     pragma comment(lib, GNOME_LIBS "/glib/lib/libglib-1.3-11.lib")
#     ifdef _DEBUG
#           pragma comment(lib, GNOME_LIBS "/gmime-x.x.x/Debug/libgmime.lib")
#     else
#           pragma comment(lib, GNOME_LIBS "/gmime-x.x.x/Release/libgmime.lib")
#     endif
#endif

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