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                 if (!tny_mime_part_is_purged (old_attachment)) {
 271                         attachment_part = copy_mime_part (old_attachment);
 272                         tny_mime_part_add_part (TNY_MIME_PART (msg), attachment_part);
 273                         g_object_unref (attachment_part);
 274                 }
 275         }
 276 }
 277
 278
 279 gchar *
 280 modest_tny_msg_get_body (TnyMsg *msg, gboolean want_html, gboolean *is_html)
 281 {
 282         TnyStream *stream;
 283         TnyMimePart *body;
 284         GtkTextBuffer *buf;
 285         GtkTextIter start, end;
 286         gchar *to_quote;
 287         gboolean result_was_html = TRUE;
 288
 289         body = modest_tny_msg_find_body_part(msg, want_html);
 290         if (!body)
 291                 return NULL;
 292
 293         buf = gtk_text_buffer_new (NULL);
 294         stream = TNY_STREAM (tny_gtk_text_buffer_stream_new (buf));
 295         tny_stream_reset (stream);
 296         tny_mime_part_decode_to_stream (body, stream);
 297         tny_stream_reset (stream);
 298
 299         gtk_text_buffer_get_bounds (buf, &start, &end);
 300         to_quote = gtk_text_buffer_get_text (buf, &start, &end, FALSE);
 301         if (tny_mime_part_content_type_is (body, "text/plain")) {
 302                 gchar *to_quote_converted = modest_text_utils_convert_to_html (to_quote);
 303                 g_free (to_quote);
 304                 to_quote = to_quote_converted;
 305                 result_was_html = FALSE;
 306         }
 307
 308         g_object_unref (buf);
 309         g_object_unref (G_OBJECT(stream));
 310         g_object_unref (G_OBJECT(body));
 311
 312         if (is_html != NULL)
 313                 *is_html = result_was_html;
 314
 315         return to_quote;
 316 }
 317
 318
 319 TnyMimePart*
 320 modest_tny_msg_find_body_part_from_mime_part (TnyMimePart *msg, gboolean want_html)
 321 {
 322         const gchar *mime_type = want_html ? "text/html" : "text/plain";
 323         TnyMimePart *part = NULL;
 324         TnyList *parts = NULL;
 325         TnyIterator *iter = NULL;
 326
 327         if (!msg)
 328                 return NULL;
 329
 330         parts = TNY_LIST (tny_simple_list_new());
 331         tny_mime_part_get_parts (TNY_MIME_PART (msg), parts);
 332
 333         iter  = tny_list_create_iterator(parts);
 334
 335         /* no parts? assume it's single-part message */
 336         if (tny_iterator_is_done(iter)) {
 337                 g_object_unref (G_OBJECT(iter));
 338                 return TNY_MIME_PART (g_object_ref(G_OBJECT(msg)));
 339         } else {
 340                 gchar *content_type = NULL;
 341                 do {
 342                         part = TNY_MIME_PART(tny_iterator_get_current (iter));
 343                         if (part && TNY_IS_MSG (part)) {
 344                                 g_object_unref (part);
 345                                 tny_iterator_next (iter);
 346                                 continue;
 347                         }
 348
 349                         /* we need to strdown the content type, because
 350                          * tny_mime_part_has_content_type does not do it...
 351                          */
 352                         if (part) {
 353                                 content_type = g_ascii_strdown
 354                                         (tny_mime_part_get_content_type (part), -1);
 355                         }
 356
 357                         if (g_str_has_prefix (content_type, mime_type) &&
 358                             !tny_mime_part_is_attachment (part))
 359                                 break;
 360
 361                         if (g_str_has_prefix(content_type, "multipart")) {
 362                                 part = modest_tny_msg_find_body_part_from_mime_part (part, want_html);
 363                                 if (part)
 364                                         break;
 365                         }
 366
 367                         if (part)
 368                                 g_object_unref (G_OBJECT(part));
 369
 370                         part = NULL;
 371
 372                         g_free (content_type);
 373                         content_type = NULL;
 374
 375                         tny_iterator_next (iter);
 376
 377                 } while (!tny_iterator_is_done(iter));
 378                 g_free (content_type);
 379         }
 380
 381         g_object_unref (G_OBJECT(iter));
 382         g_object_unref (G_OBJECT(parts));
 383
 384         /* if were trying to find an HTML part and couldn't find it,
 385          * try to find a text/plain part instead
 386          */
 387         if (!part && want_html)
 388                 return modest_tny_msg_find_body_part_from_mime_part (msg, FALSE);
 389         else
 390                 return part; /* this maybe NULL, this is not an error; some message just don't have a body
 391                               * part */
 392 }
 393
 394
 395 TnyMimePart*
 396 modest_tny_msg_find_body_part (TnyMsg *msg, gboolean want_html)
 397 {
 398         return modest_tny_msg_find_body_part_from_mime_part (TNY_MIME_PART(msg),
 399                                                              want_html);
 400 }
 401
 402
 403 #define MODEST_TNY_MSG_PARENT_UID "parent-uid"
 404
 405 static TnyMsg *
 406 create_reply_forward_mail (TnyMsg *msg, TnyHeader *header, const gchar *from,
 407                            const gchar *signature, gboolean is_reply,
 408                            guint type /*ignored*/, GList *attachments)
 409 {
 410         TnyMsg *new_msg;
 411         TnyHeader *new_header;
 412         gchar *new_subject;
 413         TnyMimePart *body = NULL;
 414         ModestFormatter *formatter;
 415         gchar *subject_prefix;
 416         gboolean no_text_part;
 417
 418         if (header)
 419                 g_object_ref (header);
 420         else
 421                 header = tny_msg_get_header (msg);
 422
 423         /* Get body from original msg. Always look for the text/plain
 424            part of the message to create the reply/forwarded mail */
 425         if (msg != NULL)
 426                 body   = modest_tny_msg_find_body_part (msg, FALSE);
 427
 428         if (modest_conf_get_bool (modest_runtime_get_conf (), MODEST_CONF_PREFER_FORMATTED_TEXT,
 429                                   NULL))
 430                 formatter = modest_formatter_new ("text/html", signature);
 431         else
 432                 formatter = modest_formatter_new ("text/plain", signature);
 433
 434
 435         /* if we don't have a text-part */
 436         no_text_part = (!body) || (strcmp (tny_mime_part_get_content_type (body), "text/html")==0);
 437
 438         /* when we're reply, include the text part if we have it, or nothing otherwise. */
 439         if (is_reply)
 440                 new_msg = modest_formatter_quote  (formatter, no_text_part ? NULL: body, header,
 441                                                     attachments);
 442         else {
 443                 /* for attachements; inline if there is a text part, and include the
 444                  * full old mail if there was none */
 445                 if (no_text_part)
 446                         new_msg = modest_formatter_attach (formatter, msg, header);
 447                 else
 448                         new_msg = modest_formatter_inline  (formatter, body, header,
 449                                                             attachments);
 450         }
 451
 452         g_object_unref (G_OBJECT(formatter));
 453         if (body)
 454                 g_object_unref (G_OBJECT(body));
 455
 456         /* Fill the header */
 457         new_header = tny_msg_get_header (new_msg);
 458         tny_header_set_from (new_header, from);
 459         tny_header_set_replyto (new_header, from);
 460
 461         /* Change the subject */
 462         if (is_reply)
 463                 subject_prefix = g_strconcat (_("mail_va_re"), ":", NULL);
 464         else
 465                 subject_prefix = g_strconcat (_("mail_va_fw"), ":", NULL);
 466         new_subject =
 467                 (gchar *) modest_text_utils_derived_subject (tny_header_get_subject(header),
 468                                                              subject_prefix);
 469         g_free (subject_prefix);
 470         tny_header_set_subject (new_header, (const gchar *) new_subject);
 471         g_free (new_subject);
 472
 473         /* get the parent uid, and set it as a gobject property on the new msg */
 474         if (new_msg) {
 475                 gchar* parent_uid = modest_tny_folder_get_header_unique_id (header);
 476                 g_object_set_data_full (G_OBJECT(new_msg), MODEST_TNY_MSG_PARENT_UID,
 477                                         parent_uid, g_free);
 478         }
 479
 480         /* Clean */
 481         g_object_unref (G_OBJECT (new_header));
 482         g_object_unref (G_OBJECT (header));
 483         /* ugly to unref it here instead of in the calling func */
 484
 485         return new_msg;
 486 }
 487
 488 const gchar*
 489 modest_tny_msg_get_parent_uid (TnyMsg *msg)
 490 {
 491         g_return_val_if_fail (msg, NULL);
 492         return g_object_get_data (G_OBJECT(msg), MODEST_TNY_MSG_PARENT_UID);
 493 }
 494
 495
 496
 497 static void
 498 add_if_attachment (gpointer data, gpointer user_data)
 499 {
 500         TnyMimePart *part;
 501         GList **attachments_list;
 502
 503         part = TNY_MIME_PART (data);
 504         attachments_list = ((GList **) user_data);
 505
 506         if ((tny_mime_part_is_attachment (part))||(TNY_IS_MSG (part))) {
 507                 *attachments_list = g_list_prepend (*attachments_list, part);
 508                 g_object_ref (part);
 509         }
 510 }
 511
 512 TnyMsg*
 513 modest_tny_msg_create_forward_msg (TnyMsg *msg,
 514                                    const gchar *from,
 515                                    const gchar *signature,
 516                                    ModestTnyMsgForwardType forward_type)
 517 {
 518         TnyMsg *new_msg;
 519         TnyList *parts = NULL;
 520         GList *attachments_list = NULL;
 521
 522         /* Add attachments */
 523         parts = TNY_LIST (tny_simple_list_new());
 524         tny_mime_part_get_parts (TNY_MIME_PART (msg), parts);
 525         tny_list_foreach (parts, add_if_attachment, &attachments_list);
 526
 527         new_msg = create_reply_forward_mail (msg, NULL, from, signature, FALSE, forward_type,
 528                                              attachments_list);
 529         add_attachments (new_msg, attachments_list);
 530
 531         /* Clean */
 532         if (attachments_list)
 533                 g_list_free (attachments_list);
 534         g_object_unref (G_OBJECT (parts));
 535
 536         return new_msg;
 537 }
 538
 539 TnyMsg*
 540 modest_tny_msg_create_reply_msg (TnyMsg *msg,
 541                                  TnyHeader *header,
 542                                  const gchar *from,
 543                                  const gchar *signature,
 544                                  ModestTnyMsgReplyType reply_type,
 545                                  ModestTnyMsgReplyMode reply_mode)
 546 {
 547         TnyMsg *new_msg = NULL;
 548         TnyHeader *new_header;
 549         const gchar* reply_to;
 550         gchar *new_cc = NULL;
 551         const gchar *cc = NULL, *bcc = NULL;
 552         GString *tmp = NULL;
 553         TnyList *parts = NULL;
 554         GList *attachments_list = NULL;
 555
 556         /* Add attachments */
 557         if (msg != NULL) {
 558                 parts = TNY_LIST (tny_simple_list_new());
 559                 tny_mime_part_get_parts (TNY_MIME_PART (msg), parts);
 560                 tny_list_foreach (parts, add_if_attachment, &attachments_list);
 561         }
 562
 563         new_msg = create_reply_forward_mail (msg, header, from, signature, TRUE, reply_type,
 564                                              attachments_list);
 565         if (attachments_list) {
 566                 g_list_foreach (attachments_list, (GFunc) g_object_unref, NULL);
 567                 g_list_free (attachments_list);
 568         }
 569         if (parts)
 570                 g_object_unref (G_OBJECT (parts));
 571
 572         /* Fill the header */
 573         if (header)
 574                 g_object_ref (header);
 575         else
 576                 header = tny_msg_get_header (msg);
 577         new_header = tny_msg_get_header (new_msg);
 578         reply_to = tny_header_get_replyto (header);
 579
 580         if (reply_to)
 581                 tny_header_set_to (new_header, reply_to);
 582         else
 583                 tny_header_set_to (new_header, tny_header_get_from (header));
 584
 585         switch (reply_mode) {
 586         case MODEST_TNY_MSG_REPLY_MODE_SENDER:
 587                 /* Do not fill neither cc nor bcc */
 588                 break;
 589         case MODEST_TNY_MSG_REPLY_MODE_LIST:
 590                 /* TODO */
 591                 break;
 592         case MODEST_TNY_MSG_REPLY_MODE_ALL:
 593                 /* Concatenate to, cc and bcc */
 594                 cc = tny_header_get_cc (header);
 595                 bcc = tny_header_get_bcc (header);
 596
 597                 tmp = g_string_new (tny_header_get_to (header));
 598                 if (cc)  g_string_append_printf (tmp, ",%s",cc);
 599                 if (bcc) g_string_append_printf (tmp, ",%s",bcc);
 600
 601                /* Remove my own address from the cc list. TODO:
 602                   remove also the To: of the new message, needed due
 603                   to the new reply_to feature */
 604                 new_cc = (gchar *)
 605                         modest_text_utils_remove_address ((const gchar *) tmp->str,
 606                                                           from);
 607                 /* FIXME: remove also the mails from the new To: */
 608                 tny_header_set_cc (new_header, new_cc);
 609
 610                 /* Clean */
 611                 g_string_free (tmp, TRUE);
 612                 g_free (new_cc);
 613                 break;
 614         }
 615
 616         /* Clean */
 617         g_object_unref (G_OBJECT (new_header));
 618         g_object_unref (G_OBJECT (header));
 619
 620         return new_msg;
 621 }
 622
 623
 624 static gboolean
 625 is_ascii(const gchar *s)
 626 {
 627         if (!s)
 628                 return TRUE;
 629         while (s[0]) {
 630                 if (s[0] & 128 || s[0] < 32)
 631                         return FALSE;
 632                 s++;
 633         }
 634         return TRUE;
 635 }
 636
 637 static char *
 638 get_content_type(const gchar *s)
 639 {
 640         GString *type;
 641
 642         type = g_string_new("text/plain");
 643         if (!is_ascii(s)) {
 644                 if (g_utf8_validate(s, -1, NULL)) {
 645                         g_string_append(type, "; charset=\"utf-8\"");
 646                 } else {
 647                         /* it should be impossible to reach this, but better safe than sorry */
 648                         g_warning("invalid utf8 in message");
 649                         g_string_append(type, "; charset=\"latin1\"");
 650                 }
 651         }
 652         return g_string_free(type, FALSE);
 653 }