git.maemo.org Git - modest/blob - src/modest-tny-msg.c

   1 /* Copyright (c) 2006, Nokia Corporation
   2  * All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions are
   6  * met:
   7  *
   8  * * Redistributions of source code must retain the above copyright
   9  *   notice, this list of conditions and the following disclaimer.
  10  * * Redistributions in binary form must reproduce the above copyright
  11  *   notice, this list of conditions and the following disclaimer in the
  12  *   documentation and/or other materials provided with the distribution.
  13  * * Neither the name of the Nokia Corporation nor the names of its
  14  *   contributors may be used to endorse or promote products derived from
  15  *   this software without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
  18  * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  19  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
  20  * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
  21  * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  22  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  23  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  24  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  25  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  26  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  27  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  28  */
  29
  30 #include <string.h>
  31 #include <gtkhtml/gtkhtml.h>
  32 #include <tny-gtk-text-buffer-stream.h>
  33 #include <tny-simple-list.h>
  34 #include <tny-folder.h>
  35 #include <modest-runtime.h>
  36 #include "modest-formatter.h"
  37 #include <tny-camel-stream.h>
  38 #include <tny-camel-mime-part.h>
  39 #include <camel/camel-stream-buffer.h>
  40 #include <camel/camel-stream-mem.h>
  41 #include <glib/gprintf.h>
  42 #include <modest-tny-folder.h>
  43
  44 #ifdef HAVE_CONFIG_H
  45 #include <config.h>
  46 #endif /*HAVE_CONFIG_H */
  47
  48 #include <modest-tny-msg.h>
  49 #include "modest-text-utils.h"
  50
  51 static TnyMimePart * add_body_part (TnyMsg *msg, const gchar *body,
  52                                     const gchar *content_type);
  53 static TnyMimePart * add_html_body_part (TnyMsg *msg, const gchar *body);
  54 static void add_attachments (TnyMsg *msg, GList *attachments_list);
  55 static char * get_content_type(const gchar *s);
  56 static gboolean is_ascii(const gchar *s);
  57
  58
  59 TnyMsg*
  60 modest_tny_msg_new (const gchar* mailto, const gchar* from, const gchar *cc,
  61                     const gchar *bcc, const gchar* subject, const gchar *body,
  62                     GList *attachments)
  63 {
  64         TnyMsg *new_msg;
  65         TnyHeader *header;
  66         gchar *content_type;
  67
  68         /* Create new msg */
  69         new_msg = modest_formatter_create_message (NULL, TRUE, (attachments != NULL));
  70         header  = tny_msg_get_header (new_msg);
  71
  72         if ((from != NULL) && (strlen(from) > 0)) {
  73                 tny_header_set_from (TNY_HEADER (header), from);
  74                 tny_header_set_replyto (TNY_HEADER (header), from);
  75         }
  76         if ((mailto != NULL) && (strlen(mailto) > 0))
  77                 tny_header_set_to (TNY_HEADER (header), mailto);
  78         if ((cc != NULL) && (strlen(cc) > 0))
  79                 tny_header_set_cc (TNY_HEADER (header), cc);
  80         if ((bcc != NULL) && (strlen(bcc) > 0))
  81                 tny_header_set_bcc (TNY_HEADER (header), bcc);
  82
  83         if ((subject != NULL) && (strlen(subject) > 0))
  84                 tny_header_set_subject (TNY_HEADER (header), subject);
  85
  86         content_type = get_content_type(body);
  87
  88         /* Add the body of the new mail */
  89         /* This is needed even if body is NULL or empty. */
  90         add_body_part (new_msg, body, content_type);
  91         g_free (content_type);
  92
  93         /* Add attachments */
  94         if (attachments)
  95                 add_attachments (new_msg, attachments);
  96
  97         return new_msg;
  98 }
  99
 100 TnyMsg*
 101 modest_tny_msg_new_html_plain (const gchar* mailto, const gchar* from, const gchar *cc,
 102                                const gchar *bcc, const gchar* subject,
 103                                const gchar *html_body, const gchar *plain_body,
 104                                GList *attachments)
 105 {
 106         TnyMsg *new_msg;
 107         TnyHeader *header;
 108         gchar *content_type;
 109
 110         /* Create new msg */
 111         new_msg = modest_formatter_create_message (NULL, FALSE, (attachments != NULL));
 112         header  = tny_msg_get_header (new_msg);
 113
 114         if ((from != NULL) && (strlen(from) > 0)) {
 115                 tny_header_set_from (TNY_HEADER (header), from);
 116                 tny_header_set_replyto (TNY_HEADER (header), from);
 117         }
 118         if ((mailto != NULL) && (strlen(mailto) > 0))
 119                 tny_header_set_to (TNY_HEADER (header), mailto);
 120         if ((cc != NULL) && (strlen(cc) > 0))
 121                 tny_header_set_cc (TNY_HEADER (header), cc);
 122         if ((bcc != NULL) && (strlen(bcc) > 0))
 123                 tny_header_set_bcc (TNY_HEADER (header), bcc);
 124
 125         if ((subject != NULL) && (strlen(subject) > 0))
 126                 tny_header_set_subject (TNY_HEADER (header), subject);
 127
 128         content_type = get_content_type(plain_body);
 129
 130         /* Add the body of the new mail */
 131         add_body_part (new_msg, plain_body, content_type);
 132         add_html_body_part (new_msg, html_body);
 133         g_free (content_type);
 134
 135         /* Add attachments */
 136         add_attachments (new_msg, attachments);
 137
 138         return new_msg;
 139 }
 140
 141
 142 /* FIXME: this func copy from modest-mail-operation: refactor */
 143 static TnyMimePart *
 144 add_body_part (TnyMsg *msg,
 145                const gchar *body,
 146                const gchar *content_type)
 147 {
 148         TnyMimePart *text_body_part = NULL;
 149         TnyStream *text_body_stream;
 150
 151         /* Create the stream */
 152         text_body_stream = TNY_STREAM (tny_camel_stream_new
 153                                        (camel_stream_mem_new_with_buffer
 154                                         (body, (body ? strlen(body) : 0))));
 155
 156         text_body_part = modest_formatter_create_body_part (NULL, msg);
 157
 158         /* Construct MIME part */
 159         tny_stream_reset (text_body_stream);
 160         tny_mime_part_construct_from_stream (text_body_part,
 161                                              text_body_stream,
 162                                              content_type);
 163         tny_stream_reset (text_body_stream);
 164
 165         g_object_unref (G_OBJECT(text_body_part));
 166
 167         /* Clean */
 168         g_object_unref (text_body_stream);
 169
 170         return text_body_part;
 171 }
 172
 173 static TnyMimePart *
 174 add_html_body_part (TnyMsg *msg,
 175                     const gchar *body)
 176 {
 177         TnyMimePart *html_body_part = NULL;
 178         TnyStream *html_body_stream;
 179
 180         /* Create the stream */
 181         html_body_stream = TNY_STREAM (tny_camel_stream_new
 182                                        (camel_stream_mem_new_with_buffer
 183                                         (body, strlen(body))));
 184
 185         /* Create body part if needed */
 186         html_body_part = modest_formatter_create_body_part (NULL, msg);
 187
 188         /* Construct MIME part */
 189         tny_stream_reset (html_body_stream);
 190         tny_mime_part_construct_from_stream (html_body_part,
 191                                              html_body_stream,
 192                                              "text/html; charset=utf-8");
 193         tny_stream_reset (html_body_stream);
 194
 195         g_object_unref (G_OBJECT(html_body_part));
 196
 197         /* Clean */
 198         g_object_unref (html_body_stream);
 199
 200         return html_body_part;
 201 }
 202
 203 static TnyMimePart *
 204 copy_mime_part (TnyMimePart *part)
 205 {
 206         TnyMimePart *result = NULL;
 207         const gchar *attachment_content_type;
 208         const gchar *attachment_filename;
 209         const gchar *attachment_cid;
 210         TnyList *parts;
 211         TnyIterator *iterator;
 212         TnyStream *attachment_stream;
 213
 214         if (TNY_IS_MSG (part)) {
 215                 g_object_ref (part);
 216                 return part;
 217         }
 218
 219         result = tny_platform_factory_new_mime_part (
 220                 modest_runtime_get_platform_factory());
 221
 222         attachment_content_type = tny_mime_part_get_content_type (part);
 223
 224         /* get mime part headers */
 225         attachment_filename = tny_mime_part_get_filename (part);
 226         attachment_cid = tny_mime_part_get_content_id (part);
 227
 228         /* fill the stream */
 229         attachment_stream = tny_mime_part_get_stream (part);
 230         tny_stream_reset (attachment_stream);
 231         tny_mime_part_construct_from_stream (result,
 232                                              attachment_stream,
 233                                              attachment_content_type);
 234         tny_stream_reset (attachment_stream);
 235
 236         /* set other mime part fields */
 237         tny_mime_part_set_filename (result, attachment_filename);
 238         tny_mime_part_set_content_id (result, attachment_cid);
 239
 240         /* copy subparts */
 241         parts = tny_simple_list_new ();
 242         tny_mime_part_get_parts (part, parts);
 243         iterator = tny_list_create_iterator (parts);
 244         while (!tny_iterator_is_done (iterator)) {
 245                 TnyMimePart *subpart = TNY_MIME_PART (tny_iterator_get_current (iterator));
 246                 if (subpart) {
 247                         TnyMimePart *subpart_copy = copy_mime_part (subpart);
 248                         tny_mime_part_add_part (result, subpart_copy);
 249                         g_object_unref (subpart);
 250                 }
 251
 252                 tny_iterator_next (iterator);
 253         }
 254         g_object_unref (iterator);
 255         g_object_unref (parts);
 256         g_object_unref (attachment_stream);
 257
 258         return result;
 259 }
 260
 261 static void
 262 add_attachments (TnyMsg *msg, GList *attachments_list)
 263 {
 264         GList *pos;
 265         TnyMimePart *attachment_part, *old_attachment;
 266
 267         for (pos = (GList *)attachments_list; pos; pos = pos->next) {
 268
 269                 old_attachment = pos->data;
 270                 attachment_part = copy_mime_part (old_attachment);
 271                 tny_mime_part_add_part (TNY_MIME_PART (msg), attachment_part);
 272                 g_object_unref (attachment_part);
 273         }
 274 }
 275
 276
 277 gchar *
 278 modest_tny_msg_get_body (TnyMsg *msg, gboolean want_html, gboolean *is_html)
 279 {
 280         TnyStream *stream;
 281         TnyMimePart *body;
 282         GtkTextBuffer *buf;
 283         GtkTextIter start, end;
 284         gchar *to_quote;
 285         gboolean result_was_html = TRUE;
 286
 287         body = modest_tny_msg_find_body_part(msg, want_html);
 288         if (!body)
 289                 return NULL;
 290
 291         buf = gtk_text_buffer_new (NULL);
 292         stream = TNY_STREAM (tny_gtk_text_buffer_stream_new (buf));
 293         tny_stream_reset (stream);
 294         tny_mime_part_decode_to_stream (body, stream);
 295         tny_stream_reset (stream);
 296
 297         gtk_text_buffer_get_bounds (buf, &start, &end);
 298         to_quote = gtk_text_buffer_get_text (buf, &start, &end, FALSE);
 299         if (tny_mime_part_content_type_is (body, "text/plain")) {
 300                 gchar *to_quote_converted = modest_text_utils_convert_to_html (to_quote);
 301                 g_free (to_quote);
 302                 to_quote = to_quote_converted;
 303                 result_was_html = FALSE;
 304         }
 305
 306         g_object_unref (buf);
 307         g_object_unref (G_OBJECT(stream));
 308         g_object_unref (G_OBJECT(body));
 309
 310         if (is_html != NULL)
 311                 *is_html = result_was_html;
 312
 313         return to_quote;
 314 }
 315
 316
 317 TnyMimePart*
 318 modest_tny_msg_find_body_part_from_mime_part (TnyMimePart *msg, gboolean want_html)
 319 {
 320         const gchar *mime_type = want_html ? "text/html" : "text/plain";
 321         TnyMimePart *part = NULL;
 322         TnyList *parts = NULL;
 323         TnyIterator *iter = NULL;
 324
 325         if (!msg)
 326                 return NULL;
 327
 328         parts = TNY_LIST (tny_simple_list_new());
 329         tny_mime_part_get_parts (TNY_MIME_PART (msg), parts);
 330
 331         iter  = tny_list_create_iterator(parts);
 332
 333         /* no parts? assume it's single-part message */
 334         if (tny_iterator_is_done(iter)) {
 335                 g_object_unref (G_OBJECT(iter));
 336                 return TNY_MIME_PART (g_object_ref(G_OBJECT(msg)));
 337         } else {
 338                 gchar *content_type = NULL;
 339                 do {
 340                         part = TNY_MIME_PART(tny_iterator_get_current (iter));
 341                         if (part && TNY_IS_MSG (part)) {
 342                                 g_object_unref (part);
 343                                 tny_iterator_next (iter);
 344                                 continue;
 345                         }
 346
 347                         /* we need to strdown the content type, because
 348                          * tny_mime_part_has_content_type does not do it...
 349                          */
 350                         if (part) {
 351                                 content_type = g_ascii_strdown
 352                                         (tny_mime_part_get_content_type (part), -1);
 353                         }
 354
 355                         if (g_str_has_prefix (content_type, mime_type) &&
 356                             !tny_mime_part_is_attachment (part))
 357                                 break;
 358
 359                         if (g_str_has_prefix(content_type, "multipart")) {
 360                                 part = modest_tny_msg_find_body_part_from_mime_part (part, want_html);
 361                                 if (part)
 362                                         break;
 363                         }
 364
 365                         if (part)
 366                                 g_object_unref (G_OBJECT(part));
 367
 368                         part = NULL;
 369
 370                         g_free (content_type);
 371                         content_type = NULL;
 372
 373                         tny_iterator_next (iter);
 374
 375                 } while (!tny_iterator_is_done(iter));
 376                 g_free (content_type);
 377         }
 378
 379         g_object_unref (G_OBJECT(iter));
 380         g_object_unref (G_OBJECT(parts));
 381
 382         /* if were trying to find an HTML part and couldn't find it,
 383          * try to find a text/plain part instead
 384          */
 385         if (!part && want_html)
 386                 return modest_tny_msg_find_body_part_from_mime_part (msg, FALSE);
 387         else
 388                 return part; /* this maybe NULL, this is not an error; some message just don't have a body
 389                               * part */
 390 }
 391
 392
 393 TnyMimePart*
 394 modest_tny_msg_find_body_part (TnyMsg *msg, gboolean want_html)
 395 {
 396         return modest_tny_msg_find_body_part_from_mime_part (TNY_MIME_PART(msg),
 397                                                              want_html);
 398 }
 399
 400
 401 #define MODEST_TNY_MSG_PARENT_UID "parent-uid"
 402
 403 static TnyMsg *
 404 create_reply_forward_mail (TnyMsg *msg, TnyHeader *header, const gchar *from, const gchar *signature,
 405                            gboolean is_reply, guint type, GList *attachments)
 406 {
 407         TnyMsg *new_msg;
 408         TnyHeader *new_header;
 409         gchar *new_subject;
 410         TnyMimePart *body = NULL;
 411         ModestFormatter *formatter;
 412         gchar *subject_prefix;
 413
 414         /* Get body from original msg. Always look for the text/plain
 415            part of the message to create the reply/forwarded mail */
 416         if (header)
 417                 g_object_ref (header);
 418         else
 419                 header = tny_msg_get_header (msg);
 420
 421         if (msg != NULL)
 422                 body   = modest_tny_msg_find_body_part (msg, !is_reply);
 423
 424         /* TODO: select the formatter from account prefs */
 425         if (modest_conf_get_bool (modest_runtime_get_conf (), MODEST_CONF_PREFER_FORMATTED_TEXT, NULL))
 426                 formatter = modest_formatter_new ("text/html", signature);
 427         else
 428                 formatter = modest_formatter_new ("text/plain", signature);
 429
 430         /* Format message body */
 431         if (is_reply) {
 432                 switch (type) {
 433                 case MODEST_TNY_MSG_REPLY_TYPE_CITE:
 434                 default:
 435                         new_msg = modest_formatter_cite  (formatter, body, header);
 436                         break;
 437                 case MODEST_TNY_MSG_REPLY_TYPE_QUOTE:
 438                         new_msg = modest_formatter_quote (formatter, body, header, attachments);
 439                         break;
 440                 }
 441         } else {
 442                 switch (type) {
 443                 case MODEST_TNY_MSG_FORWARD_TYPE_INLINE:
 444                 default:
 445                         if (strcmp (tny_mime_part_get_content_type (body), "text/html")==0)
 446                                 new_msg = modest_formatter_attach (formatter, msg, header);
 447                         else
 448                                 new_msg = modest_formatter_inline  (formatter, body, header, attachments);
 449                         break;
 450                 case MODEST_TNY_MSG_FORWARD_TYPE_ATTACHMENT:
 451                         new_msg = modest_formatter_attach (formatter, msg, header);
 452                         break;
 453                 }
 454         }
 455         g_object_unref (G_OBJECT(formatter));
 456         if (body)
 457                 g_object_unref (G_OBJECT(body));
 458
 459         /* Fill the header */
 460         new_header = tny_msg_get_header (new_msg);
 461         tny_header_set_from (new_header, from);
 462         tny_header_set_replyto (new_header, from);
 463
 464         /* Change the subject */
 465         if (is_reply)
 466                 subject_prefix = g_strconcat (_("mail_va_re"), ":", NULL);
 467         else
 468                 subject_prefix = g_strconcat (_("mail_va_fw"), ":", NULL);
 469         new_subject =
 470                 (gchar *) modest_text_utils_derived_subject (tny_header_get_subject(header),
 471                                                              subject_prefix);
 472         g_free (subject_prefix);
 473         tny_header_set_subject (new_header, (const gchar *) new_subject);
 474         g_free (new_subject);
 475
 476
 477         /* get the parent uid, and set it as a gobject property on the new msg */
 478         if (new_msg) {
 479                 gchar* parent_uid = modest_tny_folder_get_header_unique_id (header);
 480                 g_object_set_data_full (G_OBJECT(new_msg), MODEST_TNY_MSG_PARENT_UID,
 481                                         parent_uid, g_free);
 482         }
 483
 484         /* Clean */
 485         g_object_unref (G_OBJECT (new_header));
 486         g_object_unref (G_OBJECT (header)); /* ugly to unref it here instead of in the calling func */
 487
 488         return new_msg;
 489 }
 490
 491 const gchar*
 492 modest_tny_msg_get_parent_uid (TnyMsg *msg)
 493 {
 494         g_return_val_if_fail (msg, NULL);
 495         return g_object_get_data (G_OBJECT(msg), MODEST_TNY_MSG_PARENT_UID);
 496 }
 497
 498
 499
 500 static void
 501 add_if_attachment (gpointer data, gpointer user_data)
 502 {
 503         TnyMimePart *part;
 504         GList **attachments_list;
 505
 506         part = TNY_MIME_PART (data);
 507         attachments_list = ((GList **) user_data);
 508
 509         if ((tny_mime_part_is_attachment (part))||(TNY_IS_MSG (part))) {
 510                 *attachments_list = g_list_prepend (*attachments_list, part);
 511                 g_object_ref (part);
 512         }
 513 }
 514
 515 TnyMsg*
 516 modest_tny_msg_create_forward_msg (TnyMsg *msg,
 517                                    const gchar *from,
 518                                    const gchar *signature,
 519                                    ModestTnyMsgForwardType forward_type)
 520 {
 521         TnyMsg *new_msg;
 522         TnyList *parts = NULL;
 523         GList *attachments_list = NULL;
 524
 525         /* Add attachments */
 526         parts = TNY_LIST (tny_simple_list_new());
 527         tny_mime_part_get_parts (TNY_MIME_PART (msg), parts);
 528         tny_list_foreach (parts, add_if_attachment, &attachments_list);
 529
 530         new_msg = create_reply_forward_mail (msg, NULL, from, signature, FALSE, forward_type,
 531                                              attachments_list);
 532         add_attachments (new_msg, attachments_list);
 533
 534         /* Clean */
 535         if (attachments_list)
 536                 g_list_free (attachments_list);
 537         g_object_unref (G_OBJECT (parts));
 538
 539         return new_msg;
 540 }
 541
 542 TnyMsg*
 543 modest_tny_msg_create_reply_msg (TnyMsg *msg,
 544                                  TnyHeader *header,
 545                                  const gchar *from,
 546                                  const gchar *signature,
 547                                  ModestTnyMsgReplyType reply_type,
 548                                  ModestTnyMsgReplyMode reply_mode)
 549 {
 550         TnyMsg *new_msg = NULL;
 551         TnyHeader *new_header;
 552         const gchar* reply_to;
 553         gchar *new_cc = NULL;
 554         const gchar *cc = NULL, *bcc = NULL;
 555         GString *tmp = NULL;
 556         TnyList *parts = NULL;
 557         GList *attachments_list = NULL;
 558
 559         /* Add attachments */
 560         if (msg != NULL) {
 561                 parts = TNY_LIST (tny_simple_list_new());
 562                 tny_mime_part_get_parts (TNY_MIME_PART (msg), parts);
 563                 tny_list_foreach (parts, add_if_attachment, &attachments_list);
 564         }
 565
 566         new_msg = create_reply_forward_mail (msg, header, from, signature, TRUE, reply_type,
 567                                              attachments_list);
 568         if (attachments_list) {
 569                 g_list_foreach (attachments_list, (GFunc) g_object_unref, NULL);
 570                 g_list_free (attachments_list);
 571         }
 572         if (parts)
 573                 g_object_unref (G_OBJECT (parts));
 574
 575         /* Fill the header */
 576         if (header)
 577                 g_object_ref (header);
 578         else
 579                 header = tny_msg_get_header (msg);
 580         new_header = tny_msg_get_header (new_msg);
 581         reply_to = tny_header_get_replyto (header);
 582
 583         if (reply_to)
 584                 tny_header_set_to (new_header, reply_to);
 585         else
 586                 tny_header_set_to (new_header, tny_header_get_from (header));
 587
 588         switch (reply_mode) {
 589         case MODEST_TNY_MSG_REPLY_MODE_SENDER:
 590                 /* Do not fill neither cc nor bcc */
 591                 break;
 592         case MODEST_TNY_MSG_REPLY_MODE_LIST:
 593                 /* TODO */
 594                 break;
 595         case MODEST_TNY_MSG_REPLY_MODE_ALL:
 596                 /* Concatenate to, cc and bcc */
 597                 cc = tny_header_get_cc (header);
 598                 bcc = tny_header_get_bcc (header);
 599
 600                 tmp = g_string_new (tny_header_get_to (header));
 601                 if (cc)  g_string_append_printf (tmp, ",%s",cc);
 602                 if (bcc) g_string_append_printf (tmp, ",%s",bcc);
 603
 604                /* Remove my own address from the cc list. TODO:
 605                   remove also the To: of the new message, needed due
 606                   to the new reply_to feature */
 607                 new_cc = (gchar *)
 608                         modest_text_utils_remove_address ((const gchar *) tmp->str,
 609                                                           from);
 610                 /* FIXME: remove also the mails from the new To: */
 611                 tny_header_set_cc (new_header, new_cc);
 612
 613                 /* Clean */
 614                 g_string_free (tmp, TRUE);
 615                 g_free (new_cc);
 616                 break;
 617         }
 618
 619         /* Clean */
 620         g_object_unref (G_OBJECT (new_header));
 621         g_object_unref (G_OBJECT (header));
 622
 623         return new_msg;
 624 }
 625
 626
 627 static gboolean
 628 is_ascii(const gchar *s)
 629 {
 630         if (!s)
 631                 return TRUE;
 632         while (s[0]) {
 633                 if (s[0] & 128 || s[0] < 32)
 634                         return FALSE;
 635                 s++;
 636         }
 637         return TRUE;
 638 }
 639
 640 static char *
 641 get_content_type(const gchar *s)
 642 {
 643         GString *type;
 644
 645         type = g_string_new("text/plain");
 646         if (!is_ascii(s)) {
 647                 if (g_utf8_validate(s, -1, NULL)) {
 648                         g_string_append(type, "; charset=\"utf-8\"");
 649                 } else {
 650                         /* it should be impossible to reach this, but better safe than sorry */
 651                         g_warning("invalid utf8 in message");
 652                         g_string_append(type, "; charset=\"latin1\"");
 653                 }
 654         }
 655         return g_string_free(type, FALSE);
 656 }