webcit/calendar.c

   1 /*
   2  * $Id$
   3  *
   4  * Functions which handle calendar objects and their processing/display.
   5  *
   6  */
   7
   8 #include <ctype.h>
   9 #include <stdlib.h>
  10 #include <unistd.h>
  11 #include <stdio.h>
  12 #include <fcntl.h>
  13 #include <signal.h>
  14 #include <sys/types.h>
  15 #include <sys/wait.h>
  16 #include <sys/socket.h>
  17 #include <limits.h>
  18 #include <netinet/in.h>
  19 #include <netdb.h>
  20 #include <string.h>
  21 #include <pwd.h>
  22 #include <errno.h>
  23 #include <stdarg.h>
  24 #include <pthread.h>
  25 #include <signal.h>
  26 #include <time.h>
  27 #include "webcit.h"
  28 #include "webserver.h"
  29
  30 #ifndef WEBCIT_WITH_CALENDAR_SERVICE
  31
  32 /*
  33  * Handler stubs for builds with no calendar library available
  34  */
  35 void cal_process_attachment(char *part_source, long msgnum, char *cal_partnum) {
  36
  37         wprintf("<I>This message contains calendaring/scheduling information,"
  38                 " but support for calendars is not available on this "
  39                 "particular system.  Please ask your system administrator to "
  40                 "install a new version of the Citadel web service with "
  41                 "calendaring enabled.</I><BR>\n"
  42         );
  43
  44 }
  45
  46 void display_calendar(long msgnum) {
  47         wprintf("<i>"
  48                 "Cannot display calendar item.  You are seeing this error "
  49                 "because your WebCit service has not been installed with "
  50                 "calendar support.  Please contact your system administrator."
  51                 "</i><br>\n");
  52 }
  53
  54 void display_task(long msgnum) {
  55         wprintf("<i>"
  56                 "Cannot display to-do item.  You are seeing this error "
  57                 "because your WebCit service has not been installed with "
  58                 "calendar support.  Please contact your system administrator."
  59                 "</i><br>\n");
  60 }
  61
  62 #else /* WEBCIT_WITH_CALENDAR_SERVICE */
  63
  64
  65 /******   End of handler stubs.  Everything below this line is real.   ******/
  66
  67
  68
  69
  70 /*
  71  * Process a calendar object
  72  * ...at this point it's already been deserialized by cal_process_attachment()
  73  *
  74  * ok for complete vcalendar objects
  75  *
  76  */
  77 void cal_process_object(icalcomponent *cal,
  78                         int recursion_level,
  79                         long msgnum,
  80                         char *cal_partnum
  81 ) {
  82         icalcomponent *c;
  83         icalproperty *method = NULL;
  84         icalproperty_method the_method = ICAL_METHOD_NONE;
  85         icalproperty *p;
  86         struct icaltimetype t;
  87         time_t tt;
  88         char buf[SIZ];
  89         char conflict_name[SIZ];
  90         int is_update = 0;
  91
  92         /* Leading HTML for the display of this object */
  93         if (recursion_level == 0) {
  94                 wprintf("<CENTER><TABLE border=0>\n");
  95         }
  96
  97         /* Look for a method */
  98         method = icalcomponent_get_first_property(cal, ICAL_METHOD_PROPERTY);
  99
 100         /* See what we need to do with this */
 101         if (method != NULL) {
 102                 the_method = icalproperty_get_method(method);
 103                 switch(the_method) {
 104                     case ICAL_METHOD_REQUEST:
 105                         wprintf("<TR><TD COLSPAN=2>\n"
 106                                 "<IMG ALIGN=CENTER "
 107                                 "SRC=\"/static/vcalendar.gif\">"
 108                                 "&nbsp;&nbsp;"
 109                                 "<B>Meeting invitation</B>
 110                                 </TD></TR>\n"
 111                         );
 112                         break;
 113                     case ICAL_METHOD_REPLY:
 114                         wprintf("<TR><TD COLSPAN=2>\n"
 115                                 "<IMG ALIGN=CENTER "
 116                                 "SRC=\"/static/vcalendar.gif\">"
 117                                 "&nbsp;&nbsp;"
 118                                 "<B>Attendee's reply to your invitation</B>
 119                                 </TD></TR>\n"
 120                         );
 121                         break;
 122                     case ICAL_METHOD_PUBLISH:
 123                         wprintf("<TR><TD COLSPAN=2>\n"
 124                                 "<IMG ALIGN=CENTER "
 125                                 "SRC=\"/static/vcalendar.gif\">"
 126                                 "&nbsp;&nbsp;"
 127                                 "<B>Published event</B>
 128                                 </TD></TR>\n"
 129                         );
 130                         break;
 131                     default:
 132                         wprintf("<TR><TD COLSPAN=2>"
 133                                 "I don't know what to do with this.</TD></TR>"
 134                                 "\n");
 135                         break;
 136                 }
 137         }
 138
 139         p = icalcomponent_get_first_property(cal, ICAL_SUMMARY_PROPERTY);
 140         if (p != NULL) {
 141                 wprintf("<TR><TD><B>Summary:</B></TD><TD>");
 142                 escputs((char *)icalproperty_get_comment(p));
 143                 wprintf("</TD></TR>\n");
 144         }
 145
 146         p = icalcomponent_get_first_property(cal, ICAL_LOCATION_PROPERTY);
 147         if (p != NULL) {
 148                 wprintf("<TR><TD><B>Location:</B></TD><TD>");
 149                 escputs((char *)icalproperty_get_comment(p));
 150                 wprintf("</TD></TR>\n");
 151         }
 152
 153         /*
 154          * Only show start/end times if we're actually looking at the VEVENT
 155          * component.  Otherwise it shows bogus dates for things like timezone.
 156          */
 157         if (icalcomponent_isa(cal) == ICAL_VEVENT_COMPONENT) {
 158
 159                 p = icalcomponent_get_first_property(cal,
 160                                                 ICAL_DTSTART_PROPERTY);
 161                 if (p != NULL) {
 162                         t = icalproperty_get_dtstart(p);
 163
 164                         if (t.is_date) {
 165                                 wprintf("<TR><TD><B>Date:"
 166                                         "</B></TD><TD>"
 167                                         "%s %d, %d</TD></TR>",
 168                                         months[t.month - 1],
 169                                         t.day, t.year
 170                                 );
 171                         }
 172                         else {
 173                                 tt = icaltime_as_timet(t);
 174                                 fmt_date(buf, tt);
 175                                 wprintf("<TR><TD><B>Starting date/time:"
 176                                         "</B></TD><TD>"
 177                                         "%s</TD></TR>", buf
 178                                 );
 179                         }
 180                 }
 181
 182                 p = icalcomponent_get_first_property(cal, ICAL_DTEND_PROPERTY);
 183                 if (p != NULL) {
 184                         t = icalproperty_get_dtend(p);
 185                         tt = icaltime_as_timet(t);
 186                         fmt_date(buf, tt);
 187                         wprintf("<TR><TD><B>Ending date/time:</B></TD><TD>"
 188                                 "%s</TD></TR>", buf
 189                         );
 190                 }
 191
 192         }
 193
 194         p = icalcomponent_get_first_property(cal, ICAL_DESCRIPTION_PROPERTY);
 195         if (p != NULL) {
 196                 wprintf("<TR><TD><B>Description:</B></TD><TD>");
 197                 escputs((char *)icalproperty_get_comment(p));
 198                 wprintf("</TD></TR>\n");
 199         }
 200
 201         /* If the component has attendees, iterate through them. */
 202         for (p = icalcomponent_get_first_property(cal, ICAL_ATTENDEE_PROPERTY); (p != NULL); p = icalcomponent_get_next_property(cal, ICAL_ATTENDEE_PROPERTY)) {
 203                 wprintf("<TR><TD><B>Attendee:</B></TD><TD>");
 204                 strcpy(buf, icalproperty_get_attendee(p));
 205                 if (!strncasecmp(buf, "MAILTO:", 7)) {
 206
 207                         /* screen name or email address */
 208                         strcpy(buf, &buf[7]);
 209                         striplt(buf);
 210                         escputs(buf);
 211                         wprintf(" ");
 212
 213                         /* participant status */
 214                         partstat_as_string(buf, p);
 215                         escputs(buf);
 216                 }
 217                 wprintf("</TD></TR>\n");
 218         }
 219
 220         /* If the component has subcomponents, recurse through them. */
 221         for (c = icalcomponent_get_first_component(cal, ICAL_ANY_COMPONENT);
 222             (c != 0);
 223             c = icalcomponent_get_next_component(cal, ICAL_ANY_COMPONENT)) {
 224                 /* Recursively process subcomponent */
 225                 cal_process_object(c, recursion_level+1, msgnum, cal_partnum);
 226         }
 227
 228         /* If this is a REQUEST, display conflicts and buttons */
 229         if (the_method == ICAL_METHOD_REQUEST) {
 230
 231                 /* Check for conflicts */
 232                 lprintf(9, "Checking server calendar for conflicts...\n");
 233                 serv_printf("ICAL conflicts|%ld|%s|", msgnum, cal_partnum);
 234                 serv_gets(buf);
 235                 if (buf[0] == '1') {
 236                         while (serv_gets(buf), strcmp(buf, "000")) {
 237                                 extract(conflict_name, buf, 3);
 238                                 is_update = extract_int(buf, 4);
 239                                 wprintf("<TR><TD><B><I>%s</I></B></TD>"
 240                                         "<TD>"
 241                                         "%s "
 242                                         "<I>&quot;",
 243
 244                                         (is_update ?
 245                                                 "Update:" :
 246                                                 "CONFLICT:"
 247                                         ),
 248
 249                                         (is_update ?
 250                                                 "This is an update of" :
 251                                                 "This event would conflict with"
 252                                         )
 253
 254                                 );
 255                                 escputs(conflict_name);
 256                                 wprintf("&quot;</I> "
 257                                         "which is already in your calendar."
 258                                         "</TD></TR>\n");
 259                         }
 260                 }
 261                 lprintf(9, "...done.\n");
 262
 263                 /* Display the Accept/Decline buttons */
 264                 wprintf("<TR><TD COLSPAN=2>"
 265                         "<FORM METHOD=\"GET\" "
 266                         "ACTION=\"/respond_to_request\">\n"
 267                         "<INPUT TYPE=\"submit\" NAME=\"sc\" "
 268                                 "VALUE=\"Accept\">\n"
 269                         "&nbsp;&nbsp;"
 270                         "<INPUT TYPE=\"submit\" NAME=\"sc\" "
 271                                 "VALUE=\"Tentative\">\n"
 272                         "&nbsp;&nbsp;"
 273                         "<INPUT TYPE=\"submit\" NAME=\"sc\" "
 274                                 "VALUE=\"Decline\">\n"
 275                         "<INPUT TYPE=\"hidden\" NAME=\"msgnum\" "
 276                                 "VALUE=\"%ld\">"
 277                         "<INPUT TYPE=\"hidden\" NAME=\"cal_partnum\" "
 278                                 "VALUE=\"%s\">"
 279                         "</FORM>"
 280                         "</TD></TR>\n",
 281                         msgnum, cal_partnum
 282                 );
 283
 284         }
 285
 286         /* If this is a REPLY, display update button */
 287         if (the_method == ICAL_METHOD_REPLY) {
 288
 289                 /***********
 290                  * In the future, if we want to validate this object before
 291                  * continuing, we can do it this way:
 292                 serv_printf("ICAL whatever|%ld|%s|", msgnum, cal_partnum);
 293                 serv_gets(buf);
 294                 }
 295                  ***********/
 296
 297                 /* Display the update buttons */
 298                 wprintf("<TR><TD COLSPAN=2>"
 299                         "Click <i>Update</i> to accept this reply and "
 300                         "update your calendar."
 301                         "<FORM METHOD=\"GET\" "
 302                         "ACTION=\"/handle_rsvp\">\n"
 303                         "<INPUT TYPE=\"submit\" NAME=\"sc\" "
 304                                 "VALUE=\"Update\">\n"
 305                         "&nbsp;&nbsp;"
 306                         "<INPUT TYPE=\"submit\" NAME=\"sc\" "
 307                                 "VALUE=\"Ignore\">\n"
 308                         "<INPUT TYPE=\"hidden\" NAME=\"msgnum\" "
 309                                 "VALUE=\"%ld\">"
 310                         "<INPUT TYPE=\"hidden\" NAME=\"cal_partnum\" "
 311                                 "VALUE=\"%s\">"
 312                         "</FORM>"
 313                         "</TD></TR>\n",
 314                         msgnum, cal_partnum
 315                 );
 316
 317         }
 318
 319         /* Trailing HTML for the display of this object */
 320         if (recursion_level == 0) {
 321
 322                 wprintf("</TR></TABLE></CENTER>\n");
 323         }
 324 }
 325
 326
 327 /*
 328  * Deserialize a calendar object in a message so it can be processed.
 329  * (This is the main entry point for these things)
 330  * ok for complete vcalendar objects
 331  */
 332 void cal_process_attachment(char *part_source, long msgnum, char *cal_partnum) {
 333         icalcomponent *cal;
 334
 335         cal = icalcomponent_new_from_string(part_source);
 336
 337         if (cal == NULL) {
 338                 wprintf("Error parsing calendar object<BR>\n");
 339                 return;
 340         }
 341
 342         ical_dezonify(cal);
 343         cal_process_object(cal, 0, msgnum, cal_partnum);
 344
 345         /* Free the memory we obtained from libical's constructor */
 346         icalcomponent_free(cal);
 347 }
 348
 349
 350
 351
 352 /*
 353  * Respond to a meeting request
 354  */
 355 void respond_to_request(void) {
 356         char buf[SIZ];
 357
 358         output_headers(3);
 359
 360         wprintf("<TABLE WIDTH=100%% BORDER=0 BGCOLOR=\"#007700\"><TR><TD>"
 361                 "<SPAN CLASS=\"titlebar\">Respond to meeting request</SPAN>"
 362                 "</TD></TR></TABLE><BR>\n"
 363         );
 364
 365         serv_printf("ICAL respond|%s|%s|%s|",
 366                 bstr("msgnum"),
 367                 bstr("cal_partnum"),
 368                 bstr("sc")
 369         );
 370         serv_gets(buf);
 371
 372         if (buf[0] == '2') {
 373                 wprintf("<TABLE BORDER=0><TR><TD>"
 374                         "<IMG SRC=\"static/vcalendar.gif\" ALIGN=CENTER>"
 375                         "</TD><TD>"
 376                 );
 377                 if (!strcasecmp(bstr("sc"), "accept")) {
 378                         wprintf("You have accepted this meeting invitation.  "
 379                                 "It has been entered into your calendar, "
 380                         );
 381                 } else if (!strcasecmp(bstr("sc"), "tentative")) {
 382                         wprintf("You have tentatively accepted this meeting invitation.  "
 383                                 "It has been 'pencilled in' to your calendar, "
 384                         );
 385                 } else if (!strcasecmp(bstr("sc"), "decline")) {
 386                         wprintf("You have declined this meeting invitation.  "
 387                                 "It has <b>not</b> been entered into your calendar, "
 388                         );
 389                 }
 390                 wprintf("and a reply has been sent to the meeting organizer."
 391                         "</TD></TR></TABLE>\n"
 392                 );
 393         } else {
 394                 wprintf("<IMG SRC=\"static/error.gif\" ALIGN=CENTER>"
 395                         "%s\n", &buf[4]);
 396         }
 397
 398         wprintf("<A HREF=\"/dotskip?room=");
 399         urlescputs(WC->wc_roomname);
 400         wprintf("\"><BR>Return to messages</A><BR>\n");
 401
 402         wDumpContent(1);
 403 }
 404
 405
 406
 407 /*
 408  * Handle an incoming RSVP
 409  */
 410 void handle_rsvp(void) {
 411         char buf[SIZ];
 412
 413         output_headers(3);
 414
 415         wprintf("<TABLE WIDTH=100%% BORDER=0 BGCOLOR=\"#007700\"><TR><TD>"
 416                 "<SPAN CLASS=\"titlebar\">"
 417                 "Update your calendar with this RSVP</SPAN>"
 418                 "</TD></TR></TABLE><BR>\n"
 419         );
 420
 421         serv_printf("ICAL handle_rsvp|%s|%s|%s|",
 422                 bstr("msgnum"),
 423                 bstr("cal_partnum"),
 424                 bstr("sc")
 425         );
 426         serv_gets(buf);
 427
 428         if (buf[0] == '2') {
 429                 wprintf("<TABLE BORDER=0><TR><TD>"
 430                         "<IMG SRC=\"static/vcalendar.gif\" ALIGN=CENTER>"
 431                         "</TD><TD>"
 432                 );
 433                 if (!strcasecmp(bstr("sc"), "update")) {
 434                         wprintf("Your calendar has been updated "
 435                                 "to reflect this RSVP."
 436                         );
 437                 } else if (!strcasecmp(bstr("sc"), "ignore")) {
 438                         wprintf("You have chosen to ignore this RSVP. "
 439                                 "Your calendar has <b>not</b> been updated."
 440                         );
 441                 }
 442                 wprintf("</TD></TR></TABLE>\n"
 443                 );
 444         } else {
 445                 wprintf("<IMG SRC=\"static/error.gif\" ALIGN=CENTER>"
 446                         "%s\n", &buf[4]);
 447         }
 448
 449         wprintf("<A HREF=\"/dotskip?room=");
 450         urlescputs(WC->wc_roomname);
 451         wprintf("\"><BR>Return to messages</A><BR>\n");
 452
 453         wDumpContent(1);
 454 }
 455
 456
 457
 458
 459 /*****************************************************************************/
 460
 461
 462
 463 /*
 464  * Display handlers for message reading
 465  */
 466
 467
 468
 469 /*
 470  * If we're reading calendar items, just store them for now.  We have to
 471  * sort and re-output them later when we draw the calendar.
 472  */
 473 void display_individual_cal(icalcomponent *cal, long msgnum) {
 474
 475         WC->num_cal += 1;
 476
 477         WC->disp_cal = realloc(WC->disp_cal,
 478                         (sizeof(icalcomponent *) * WC->num_cal) );
 479         WC->disp_cal[WC->num_cal - 1] = icalcomponent_new_clone(cal);
 480
 481         WC->cal_msgnum = realloc(WC->cal_msgnum,
 482                         (sizeof(long) * WC->num_cal) );
 483         WC->cal_msgnum[WC->num_cal - 1] = msgnum;
 484 }
 485
 486
 487
 488 /*
 489  * Display a task in the task list
 490  */
 491 void display_individual_task(icalcomponent *vtodo, long msgnum) {
 492         icalproperty *p;
 493
 494         p = icalcomponent_get_first_property(vtodo, ICAL_SUMMARY_PROPERTY);
 495         wprintf("<LI><A HREF=\"/display_edit_task?msgnum=%ld&taskrm=", msgnum);
 496         urlescputs(WC->wc_roomname);
 497         wprintf("\">");
 498         if (p != NULL) {
 499                 escputs((char *)icalproperty_get_comment(p));
 500         }
 501         wprintf("</A>\n");
 502 }
 503
 504
 505 /*
 506  * Display a task by itself (for editing)
 507  *
 508  * ok for complete vcalendar objects
 509  */
 510 void display_edit_individual_task(icalcomponent *supplied_vtodo, long msgnum) {
 511         icalcomponent *vtodo;
 512         icalproperty *p;
 513         struct icaltimetype t;
 514         time_t now;
 515         int created_new_vtodo = 0;
 516
 517         now = time(NULL);
 518
 519         if (supplied_vtodo != NULL) {
 520                 vtodo = supplied_vtodo;
 521
 522                 /* If we're looking at a fully encapsulated VCALENDAR
 523                  * rather than a VTODO component, attempt to use the first
 524                  * relevant VTODO subcomponent.  If there is none, the
 525                  * NULL returned by icalcomponent_get_first_component() will
 526                  * tell the next iteration of this function to create a
 527                  * new one.
 528                  */
 529                 if (icalcomponent_isa(vtodo) == ICAL_VCALENDAR_COMPONENT) {
 530                         display_edit_individual_task(
 531                                 icalcomponent_get_first_component(
 532                                         vtodo, ICAL_VTODO_COMPONENT
 533                                 ), msgnum
 534                         );
 535                         return;
 536                 }
 537         }
 538         else {
 539                 vtodo = icalcomponent_new(ICAL_VTODO_COMPONENT);
 540                 created_new_vtodo = 1;
 541         }
 542
 543         output_headers(3);
 544         wprintf("<TABLE WIDTH=100%% BORDER=0 BGCOLOR=\"#007700\"><TR><TD>"
 545                 "<SPAN CLASS=\"titlebar\">Edit task</SPAN>"
 546                 "</TD></TR></TABLE><BR>\n"
 547         );
 548
 549         wprintf("<FORM METHOD=\"POST\" ACTION=\"/save_task\">\n");
 550         wprintf("<INPUT TYPE=\"hidden\" NAME=\"msgnum\" VALUE=\"%ld\">\n",
 551                 msgnum);
 552
 553         wprintf("Summary: "
 554                 "<INPUT TYPE=\"text\" NAME=\"summary\" "
 555                 "MAXLENGTH=\"64\" SIZE=\"64\" VALUE=\"");
 556         p = icalcomponent_get_first_property(vtodo, ICAL_SUMMARY_PROPERTY);
 557         if (p != NULL) {
 558                 escputs((char *)icalproperty_get_comment(p));
 559         }
 560         wprintf("\"><BR>\n");
 561
 562         wprintf("Start date: ");
 563         p = icalcomponent_get_first_property(vtodo, ICAL_DTSTART_PROPERTY);
 564         if (p != NULL) {
 565                 t = icalproperty_get_dtstart(p);
 566         }
 567         else {
 568                 t = icaltime_from_timet(now, 0);
 569         }
 570         display_icaltimetype_as_webform(&t, "dtstart");
 571         wprintf("<BR>\n");
 572
 573         wprintf("Due date: ");
 574         p = icalcomponent_get_first_property(vtodo, ICAL_DUE_PROPERTY);
 575         if (p != NULL) {
 576                 t = icalproperty_get_due(p);
 577         }
 578         else {
 579                 t = icaltime_from_timet(now, 0);
 580         }
 581         display_icaltimetype_as_webform(&t, "due");
 582         wprintf("<BR>\n");
 583
 584         wprintf("<CENTER><TEXTAREA NAME=\"description\" wrap=soft "
 585                 "ROWS=10 COLS=80 WIDTH=80>\n"
 586         );
 587         p = icalcomponent_get_first_property(vtodo, ICAL_DESCRIPTION_PROPERTY);
 588         if (p != NULL) {
 589                 escputs((char *)icalproperty_get_comment(p));
 590         }
 591         wprintf("</TEXTAREA><BR>\n");
 592
 593         wprintf("<INPUT TYPE=\"submit\" NAME=\"sc\" VALUE=\"Save\">"
 594                 "&nbsp;&nbsp;"
 595                 "<INPUT TYPE=\"submit\" NAME=\"sc\" VALUE=\"Delete\">\n"
 596                 "&nbsp;&nbsp;"
 597                 "<INPUT TYPE=\"submit\" NAME=\"sc\" VALUE=\"Cancel\">\n"
 598                 "</CENTER>\n"
 599         );
 600
 601         wprintf("</FORM>\n");
 602
 603         wDumpContent(1);
 604
 605         if (created_new_vtodo) {
 606                 icalcomponent_free(vtodo);
 607         }
 608 }
 609
 610 /*
 611  * Save an edited task
 612  *
 613  * ok
 614  */
 615 void save_individual_task(icalcomponent *supplied_vtodo, long msgnum) {
 616         char buf[SIZ];
 617         int delete_existing = 0;
 618         icalproperty *prop;
 619         icalcomponent *vtodo;
 620         int created_new_vtodo = 0;
 621
 622         if (supplied_vtodo != NULL) {
 623                 vtodo = supplied_vtodo;
 624                 /* If we're looking at a fully encapsulated VCALENDAR
 625                  * rather than a VTODO component, attempt to use the first
 626                  * relevant VTODO subcomponent.  If there is none, the
 627                  * NULL returned by icalcomponent_get_first_component() will
 628                  * tell the next iteration of this function to create a
 629                  * new one.
 630                  */
 631                 if (icalcomponent_isa(vtodo) == ICAL_VCALENDAR_COMPONENT) {
 632                         save_individual_task(
 633                                 icalcomponent_get_first_component(
 634                                         vtodo, ICAL_VTODO_COMPONENT
 635                                 ), msgnum
 636                         );
 637                         return;
 638                 }
 639         }
 640         else {
 641                 vtodo = icalcomponent_new(ICAL_VTODO_COMPONENT);
 642                 created_new_vtodo = 1;
 643         }
 644
 645         if (!strcasecmp(bstr("sc"), "Save")) {
 646
 647                 /* Replace values in the component with ones from the form */
 648
 649                 while (prop = icalcomponent_get_first_property(vtodo,
 650                       ICAL_SUMMARY_PROPERTY), prop != NULL) {
 651                         icalcomponent_remove_property(vtodo, prop);
 652                         icalproperty_free(prop);
 653                 }
 654                 icalcomponent_add_property(vtodo,
 655                         icalproperty_new_summary(bstr("summary")));
 656
 657                 while (prop = icalcomponent_get_first_property(vtodo,
 658                       ICAL_DESCRIPTION_PROPERTY), prop != NULL) {
 659                         icalcomponent_remove_property(vtodo, prop);
 660                         icalproperty_free(prop);
 661                 }
 662                 icalcomponent_add_property(vtodo,
 663                         icalproperty_new_description(bstr("description")));
 664
 665                 while (prop = icalcomponent_get_first_property(vtodo,
 666                       ICAL_DTSTART_PROPERTY), prop != NULL) {
 667                         icalcomponent_remove_property(vtodo, prop);
 668                         icalproperty_free(prop);
 669                 }
 670                 icalcomponent_add_property(vtodo,
 671                         icalproperty_new_dtstart(
 672                                 icaltime_from_webform("dtstart")
 673                         )
 674                 );
 675
 676                 while (prop = icalcomponent_get_first_property(vtodo,
 677                       ICAL_DUE_PROPERTY), prop != NULL) {
 678                         icalcomponent_remove_property(vtodo, prop);
 679                         icalproperty_free(prop);
 680                 }
 681                 icalcomponent_add_property(vtodo,
 682                         icalproperty_new_due(
 683                                 icaltime_from_webform("due")
 684                         )
 685                 );
 686
 687                 /* Serialize it and save it to the message base */
 688                 serv_puts("ENT0 1|||4");
 689                 serv_gets(buf);
 690                 if (buf[0] == '4') {
 691                         serv_puts("Content-type: text/calendar");
 692                         serv_puts("");
 693                         serv_puts(icalcomponent_as_ical_string(vtodo));
 694                         serv_puts("000");
 695
 696                         /* Probably not necessary; the server will see the UID
 697                          * of the object and delete the old one anyway, but
 698                          * just in case...
 699                          */
 700                         delete_existing = 1;
 701                 }
 702         }
 703
 704         /*
 705          * If the user clicked 'Delete' then explicitly delete the message.
 706          */
 707         if (!strcasecmp(bstr("sc"), "Delete")) {
 708                 delete_existing = 1;
 709         }
 710
 711         if ( (delete_existing) && (msgnum > 0L) ) {
 712                 serv_printf("DELE %ld", atol(bstr("msgnum")));
 713                 serv_gets(buf);
 714         }
 715
 716         if (created_new_vtodo) {
 717                 icalcomponent_free(vtodo);
 718         }
 719
 720         /* Go back to the task list */
 721         readloop("readfwd");
 722 }
 723
 724
 725
 726 /*
 727  * Code common to all display handlers.  Given a message number and a MIME
 728  * type, we load the message and hunt for that MIME type.  If found, we load
 729  * the relevant part, deserialize it into a libical component, filter it for
 730  * the requested object type, and feed it to the specified handler.
 731  *
 732  * ok
 733  */
 734 void display_using_handler(long msgnum,
 735                         char *mimetype,
 736                         icalcomponent_kind which_kind,
 737                         void (*callback)(icalcomponent *, long)
 738         ) {
 739         char buf[SIZ];
 740         char mime_partnum[SIZ];
 741         char mime_filename[SIZ];
 742         char mime_content_type[SIZ];
 743         char mime_disposition[SIZ];
 744         int mime_length;
 745         char relevant_partnum[SIZ];
 746         char *relevant_source = NULL;
 747         icalcomponent *cal, *c;
 748
 749         sprintf(buf, "MSG0 %ld|1", msgnum);     /* ask for headers only */
 750         serv_puts(buf);
 751         serv_gets(buf);
 752         if (buf[0] != '1') return;
 753
 754         while (serv_gets(buf), strcmp(buf, "000")) {
 755                 if (!strncasecmp(buf, "part=", 5)) {
 756                         extract(mime_filename, &buf[5], 1);
 757                         extract(mime_partnum, &buf[5], 2);
 758                         extract(mime_disposition, &buf[5], 3);
 759                         extract(mime_content_type, &buf[5], 4);
 760                         mime_length = extract_int(&buf[5], 5);
 761
 762                         if (!strcasecmp(mime_content_type, "text/calendar")) {
 763                                 strcpy(relevant_partnum, mime_partnum);
 764                         }
 765
 766                 }
 767         }
 768
 769         if (strlen(relevant_partnum) > 0) {
 770                 relevant_source = load_mimepart(msgnum, relevant_partnum);
 771                 if (relevant_source != NULL) {
 772
 773                         cal = icalcomponent_new_from_string(relevant_source);
 774                         if (cal != NULL) {
 775
 776                                 ical_dezonify(cal);
 777
 778                                 /* Simple components of desired type */
 779                                 if (icalcomponent_isa(cal) == which_kind) {
 780                                         callback(cal, msgnum);
 781                                 }
 782
 783                                 /* Subcomponents of desired type */
 784                                 for (c = icalcomponent_get_first_component(cal,
 785                                     which_kind);
 786                                     (c != 0);
 787                                     c = icalcomponent_get_next_component(cal,
 788                                     which_kind)) {
 789                                         callback(c, msgnum);
 790                                 }
 791                                 icalcomponent_free(cal);
 792                         }
 793                         free(relevant_source);
 794                 }
 795         }
 796
 797 }
 798
 799 void display_calendar(long msgnum) {
 800         display_using_handler(msgnum, "text/calendar",
 801                                 ICAL_VEVENT_COMPONENT,
 802                                 display_individual_cal);
 803 }
 804
 805 void display_task(long msgnum) {
 806         display_using_handler(msgnum, "text/calendar",
 807                                 ICAL_VTODO_COMPONENT,
 808                                 display_individual_task);
 809 }
 810
 811 void display_edit_task(void) {
 812         long msgnum = 0L;
 813
 814         /* Force change the room if we have to */
 815         if (strlen(bstr("taskrm")) > 0) {
 816                 gotoroom(bstr("taskrm"), 0);
 817         }
 818
 819         msgnum = atol(bstr("msgnum"));
 820         if (msgnum > 0L) {
 821                 /* existing task */
 822                 display_using_handler(msgnum, "text/calendar",
 823                                 ICAL_VTODO_COMPONENT,
 824                                 display_edit_individual_task);
 825         }
 826         else {
 827                 /* new task */
 828                 display_edit_individual_task(NULL, 0L);
 829         }
 830 }
 831
 832 void save_task(void) {
 833         long msgnum = 0L;
 834
 835         msgnum = atol(bstr("msgnum"));
 836         if (msgnum > 0L) {
 837                 display_using_handler(msgnum, "text/calendar",
 838                                 ICAL_VTODO_COMPONENT,
 839                                 save_individual_task);
 840         }
 841         else {
 842                 save_individual_task(NULL, 0L);
 843         }
 844 }
 845
 846 void display_edit_event(void) {
 847         long msgnum = 0L;
 848
 849         msgnum = atol(bstr("msgnum"));
 850         if (msgnum > 0L) {
 851                 /* existing event */
 852                 display_using_handler(msgnum, "text/calendar",
 853                                 ICAL_VEVENT_COMPONENT,
 854                                 display_edit_individual_event);
 855         }
 856         else {
 857                 /* new event */
 858                 display_edit_individual_event(NULL, 0L);
 859         }
 860 }
 861
 862 void save_event(void) {
 863         long msgnum = 0L;
 864
 865         msgnum = atol(bstr("msgnum"));
 866
 867         if (msgnum > 0L) {
 868                 display_using_handler(msgnum, "text/calendar",
 869                                 ICAL_VEVENT_COMPONENT,
 870                                 save_individual_event);
 871         }
 872         else {
 873                 save_individual_event(NULL, 0L);
 874         }
 875 }
 876
 877 #endif /* WEBCIT_WITH_CALENDAR_SERVICE */