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 HAVE_ICAL_H
  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 /* HAVE_ICAL_H */
  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 void cal_process_object(icalcomponent *cal,
  75                         int recursion_level,
  76                         long msgnum,
  77                         char *cal_partnum
  78 ) {
  79         icalcomponent *c;
  80         icalproperty *method = NULL;
  81         icalproperty_method the_method = ICAL_METHOD_NONE;
  82         icalproperty *p;
  83         struct icaltimetype t;
  84         time_t tt;
  85         char buf[SIZ];
  86         char conflict_name[SIZ];
  87         int is_update = 0;
  88
  89         /* Leading HTML for the display of this object */
  90         if (recursion_level == 0) {
  91                 wprintf("<CENTER><TABLE border=0>\n");
  92         }
  93
  94         /* Look for a method */
  95         method = icalcomponent_get_first_property(cal, ICAL_METHOD_PROPERTY);
  96
  97         /* See what we need to do with this */
  98         if (method != NULL) {
  99                 the_method = icalproperty_get_method(method);
 100                 switch(the_method) {
 101                     case ICAL_METHOD_REQUEST:
 102                         wprintf("<TR><TD COLSPAN=2>\n"
 103                                 "<IMG ALIGN=CENTER "
 104                                 "SRC=\"/static/vcalendar.gif\">"
 105                                 "&nbsp;&nbsp;"
 106                                 "<B>Meeting invitation</B>
 107                                 </TD></TR>\n"
 108                         );
 109                         break;
 110                     case ICAL_METHOD_PUBLISH:
 111                         wprintf("<TR><TD COLSPAN=2>\n"
 112                                 "<IMG ALIGN=CENTER "
 113                                 "SRC=\"/static/vcalendar.gif\">"
 114                                 "&nbsp;&nbsp;"
 115                                 "<B>Published event</B>
 116                                 </TD></TR>\n"
 117                         );
 118                         break;
 119                     default:
 120                         wprintf("<TR><TD COLSPAN=2>"
 121                                 "I don't know what to do with this.</TD></TR>"
 122                                 "\n");
 123                         break;
 124                 }
 125         }
 126
 127         p = icalcomponent_get_first_property(cal, ICAL_SUMMARY_PROPERTY);
 128         if (p != NULL) {
 129                 wprintf("<TR><TD><B>Summary:</B></TD><TD>");
 130                 escputs((char *)icalproperty_get_comment(p));
 131                 wprintf("</TD></TR>\n");
 132         }
 133
 134         p = icalcomponent_get_first_property(cal, ICAL_LOCATION_PROPERTY);
 135         if (p != NULL) {
 136                 wprintf("<TR><TD><B>Location:</B></TD><TD>");
 137                 escputs((char *)icalproperty_get_comment(p));
 138                 wprintf("</TD></TR>\n");
 139         }
 140
 141         /*
 142          * Only show start/end times if we're actually looking at the VEVENT
 143          * component.  Otherwise it shows bogus dates for things like timezone.
 144          */
 145         if (icalcomponent_isa(cal) == ICAL_VEVENT_COMPONENT) {
 146
 147                 p = icalcomponent_get_first_property(cal,
 148                                                 ICAL_DTSTART_PROPERTY);
 149                 if (p != NULL) {
 150                         t = icalproperty_get_dtstart(p);
 151                         tt = icaltime_as_timet(t);
 152                         fmt_date(buf, tt);
 153                         wprintf("<TR><TD><B>Starting date/time:</B></TD><TD>"
 154                                 "%s</TD></TR>", buf
 155                         );
 156                 }
 157
 158                 p = icalcomponent_get_first_property(cal, ICAL_DTEND_PROPERTY);
 159                 if (p != NULL) {
 160                         t = icalproperty_get_dtend(p);
 161                         tt = icaltime_as_timet(t);
 162                         fmt_date(buf, tt);
 163                         wprintf("<TR><TD><B>Ending date/time:</B></TD><TD>"
 164                                 "%s</TD></TR>", buf
 165                         );
 166                 }
 167
 168         }
 169
 170         p = icalcomponent_get_first_property(cal, ICAL_DESCRIPTION_PROPERTY);
 171         if (p != NULL) {
 172                 wprintf("<TR><TD><B>Description:</B></TD><TD>");
 173                 escputs((char *)icalproperty_get_comment(p));
 174                 wprintf("</TD></TR>\n");
 175         }
 176
 177         /* If the component has subcomponents, recurse through them. */
 178         for (c = icalcomponent_get_first_component(cal, ICAL_ANY_COMPONENT);
 179             (c != 0);
 180             c = icalcomponent_get_next_component(cal, ICAL_ANY_COMPONENT)) {
 181                 /* Recursively process subcomponent */
 182                 cal_process_object(c, recursion_level+1, msgnum, cal_partnum);
 183         }
 184
 185         /* If this is a REQUEST, display conflicts and buttons */
 186         if (the_method == ICAL_METHOD_REQUEST) {
 187
 188                 /* Check for conflicts */
 189                 serv_printf("ICAL conflicts|%ld|%s|", msgnum, cal_partnum);
 190                 serv_gets(buf);
 191                 if (buf[0] == '1') {
 192                         while (serv_gets(buf), strcmp(buf, "000")) {
 193                                 extract(conflict_name, buf, 3);
 194                                 is_update = extract_int(buf, 4);
 195                                 wprintf("<TR><TD><B><I>%s</I></B></TD>"
 196                                         "<TD>"
 197                                         "%s "
 198                                         "<I>&quot;",
 199
 200                                         (is_update ?
 201                                                 "Update:" :
 202                                                 "CONFLICT:"
 203                                         ),
 204
 205                                         (is_update ?
 206                                                 "This is an update of" :
 207                                                 "This event would conflict with"
 208                                         )
 209
 210                                 );
 211                                 escputs(conflict_name);
 212                                 wprintf("&quot;</I> "
 213                                         "which is already in your calendar."
 214                                         "</TD></TR>\n");
 215                         }
 216                 }
 217
 218                 /* Display the Accept/Decline buttons */
 219                 wprintf("<TR><TD COLSPAN=2>"
 220                         "<FORM METHOD=\"GET\" "
 221                         "ACTION=\"/respond_to_request\">\n"
 222                         "<INPUT TYPE=\"submit\" NAME=\"sc\" "
 223                                 "VALUE=\"Accept\">\n"
 224                         "&nbsp;&nbsp;"
 225                         "<INPUT TYPE=\"submit\" NAME=\"sc\" "
 226                                 "VALUE=\"Tentative\">\n"
 227                         "&nbsp;&nbsp;"
 228                         "<INPUT TYPE=\"submit\" NAME=\"sc\" "
 229                                 "VALUE=\"Decline\">\n"
 230                         "<INPUT TYPE=\"hidden\" NAME=\"msgnum\" "
 231                                 "VALUE=\"%ld\">"
 232                         "<INPUT TYPE=\"hidden\" NAME=\"cal_partnum\" "
 233                                 "VALUE=\"%s\">"
 234                         "</FORM>"
 235                         "</TD></TR>\n",
 236                         msgnum, cal_partnum
 237                 );
 238
 239         }
 240
 241         /* Trailing HTML for the display of this object */
 242         if (recursion_level == 0) {
 243
 244                 wprintf("</TR></TABLE></CENTER>\n");
 245         }
 246 }
 247
 248
 249 /*
 250  * Deserialize a calendar object in a message so it can be processed.
 251  * (This is the main entry point for these things)
 252  */
 253 void cal_process_attachment(char *part_source, long msgnum, char *cal_partnum) {
 254         icalcomponent *cal;
 255
 256         cal = icalcomponent_new_from_string(part_source);
 257
 258         if (cal == NULL) {
 259                 wprintf("Error parsing calendar object: %s<BR>\n",
 260                         icalerror_strerror(icalerrno));
 261                 return;
 262         }
 263
 264         cal_process_object(cal, 0, msgnum, cal_partnum);
 265
 266         /* Free the memory we obtained from libical's constructor */
 267         icalcomponent_free(cal);
 268 }
 269
 270
 271
 272
 273 /*
 274  * Respond to a meeting request
 275  */
 276 void respond_to_request(void) {
 277         char buf[SIZ];
 278
 279         output_headers(3);
 280
 281         wprintf("<TABLE WIDTH=100%% BORDER=0 BGCOLOR=007700><TR><TD>"
 282                 "<FONT SIZE=+1 COLOR=\"FFFFFF\""
 283                 "<B>Respond to meeting request</B>"
 284                 "</FONT></TD></TR></TABLE><BR>\n"
 285         );
 286
 287         serv_printf("ICAL respond|%s|%s|%s|",
 288                 bstr("msgnum"),
 289                 bstr("cal_partnum"),
 290                 bstr("sc")
 291         );
 292         serv_gets(buf);
 293         escputs(buf);
 294
 295         wDumpContent(1);
 296 }
 297
 298
 299
 300
 301 /*****************************************************************************/
 302
 303
 304
 305 /*
 306  * Display handlers for message reading
 307  */
 308
 309
 310
 311 /*
 312  * If we're reading calendar items, just store them for now.  We have to
 313  * sort and re-output them later when we draw the calendar.
 314  */
 315 void display_individual_cal(icalcomponent *cal, long msgnum) {
 316
 317         WC->num_cal += 1;
 318
 319         WC->disp_cal = realloc(WC->disp_cal,
 320                         (sizeof(icalcomponent *) * WC->num_cal) );
 321         WC->disp_cal[WC->num_cal - 1] = icalcomponent_new_clone(cal);
 322
 323         WC->cal_msgnum = realloc(WC->cal_msgnum,
 324                         (sizeof(long) * WC->num_cal) );
 325         WC->cal_msgnum[WC->num_cal - 1] = msgnum;
 326 }
 327
 328
 329
 330 /*
 331  * Display a task in the task list
 332  */
 333 void display_individual_task(icalcomponent *vtodo, long msgnum) {
 334         icalproperty *p;
 335
 336         p = icalcomponent_get_first_property(vtodo, ICAL_SUMMARY_PROPERTY);
 337         wprintf("<LI><A HREF=\"/display_edit_task?msgnum=%ld\">", msgnum);
 338         if (p != NULL) {
 339                 escputs((char *)icalproperty_get_comment(p));
 340         }
 341         wprintf("</A>\n");
 342 }
 343
 344
 345 /*
 346  * Display a task by itself (for editing)
 347  */
 348 void display_edit_individual_task(icalcomponent *supplied_vtodo, long msgnum) {
 349         icalcomponent *vtodo;
 350         icalproperty *p;
 351         struct icaltimetype t;
 352         time_t now;
 353         int created_new_vtodo = 0;
 354
 355         now = time(NULL);
 356
 357         if (supplied_vtodo != NULL) {
 358                 vtodo = supplied_vtodo;
 359         }
 360         else {
 361                 vtodo = icalcomponent_new(ICAL_VTODO_COMPONENT);
 362                 created_new_vtodo = 1;
 363         }
 364
 365         output_headers(3);
 366         wprintf("<TABLE WIDTH=100%% BORDER=0 BGCOLOR=007700><TR><TD>"
 367                 "<FONT SIZE=+1 COLOR=\"FFFFFF\""
 368                 "<B>Edit task</B>"
 369                 "</FONT></TD></TR></TABLE><BR>\n"
 370         );
 371
 372         wprintf("<FORM METHOD=\"POST\" ACTION=\"/save_task\">\n");
 373         wprintf("<INPUT TYPE=\"hidden\" NAME=\"msgnum\" VALUE=\"%ld\">\n",
 374                 msgnum);
 375
 376         wprintf("Summary: "
 377                 "<INPUT TYPE=\"text\" NAME=\"summary\" "
 378                 "MAXLENGTH=\"64\" SIZE=\"64\" VALUE=\"");
 379         p = icalcomponent_get_first_property(vtodo, ICAL_SUMMARY_PROPERTY);
 380         if (p != NULL) {
 381                 escputs((char *)icalproperty_get_comment(p));
 382         }
 383         wprintf("\"><BR>\n");
 384
 385         wprintf("Start date: ");
 386         p = icalcomponent_get_first_property(vtodo, ICAL_DTSTART_PROPERTY);
 387         if (p != NULL) {
 388                 t = icalproperty_get_dtstart(p);
 389         }
 390         else {
 391                 t = icaltime_from_timet(now, 0);
 392         }
 393         display_icaltimetype_as_webform(&t, "dtstart");
 394         wprintf("<BR>\n");
 395
 396         wprintf("Due date: ");
 397         p = icalcomponent_get_first_property(vtodo, ICAL_DUE_PROPERTY);
 398         if (p != NULL) {
 399                 t = icalproperty_get_due(p);
 400         }
 401         else {
 402                 t = icaltime_from_timet(now, 0);
 403         }
 404         display_icaltimetype_as_webform(&t, "due");
 405         wprintf("<BR>\n");
 406
 407         wprintf("<CENTER><TEXTAREA NAME=\"description\" wrap=soft "
 408                 "ROWS=10 COLS=80 WIDTH=80>\n"
 409         );
 410         p = icalcomponent_get_first_property(vtodo, ICAL_DESCRIPTION_PROPERTY);
 411         if (p != NULL) {
 412                 escputs((char *)icalproperty_get_comment(p));
 413         }
 414         wprintf("</TEXTAREA><BR>\n");
 415
 416         wprintf("<INPUT TYPE=\"submit\" NAME=\"sc\" VALUE=\"Save\">"
 417                 "&nbsp;&nbsp;"
 418                 "<INPUT TYPE=\"submit\" NAME=\"sc\" VALUE=\"Delete\">\n"
 419                 "&nbsp;&nbsp;"
 420                 "<INPUT TYPE=\"submit\" NAME=\"sc\" VALUE=\"Cancel\">\n"
 421                 "</CENTER>\n"
 422         );
 423
 424         wprintf("</FORM>\n");
 425
 426         wDumpContent(1);
 427
 428         if (created_new_vtodo) {
 429                 icalcomponent_free(vtodo);
 430         }
 431 }
 432
 433 /*
 434  * Save an edited task
 435  */
 436 void save_individual_task(icalcomponent *supplied_vtodo, long msgnum) {
 437         char buf[SIZ];
 438         int delete_existing = 0;
 439         icalproperty *prop;
 440         icalcomponent *vtodo;
 441         int created_new_vtodo = 0;
 442
 443         if (supplied_vtodo != NULL) {
 444                 vtodo = supplied_vtodo;
 445         }
 446         else {
 447                 vtodo = icalcomponent_new(ICAL_VTODO_COMPONENT);
 448                 created_new_vtodo = 1;
 449         }
 450
 451         if (!strcasecmp(bstr("sc"), "Save")) {
 452
 453                 /* Replace values in the component with ones from the form */
 454
 455                 while (prop = icalcomponent_get_first_property(vtodo,
 456                       ICAL_SUMMARY_PROPERTY), prop != NULL) {
 457                         icalcomponent_remove_property(vtodo, prop);
 458                 }
 459                 icalcomponent_add_property(vtodo,
 460                         icalproperty_new_summary(bstr("summary")));
 461
 462                 while (prop = icalcomponent_get_first_property(vtodo,
 463                       ICAL_DESCRIPTION_PROPERTY), prop != NULL) {
 464                         icalcomponent_remove_property(vtodo, prop);
 465                 }
 466                 icalcomponent_add_property(vtodo,
 467                         icalproperty_new_description(bstr("description")));
 468
 469                 while (prop = icalcomponent_get_first_property(vtodo,
 470                       ICAL_DTSTART_PROPERTY), prop != NULL) {
 471                         icalcomponent_remove_property(vtodo, prop);
 472                 }
 473                 icalcomponent_add_property(vtodo,
 474                         icalproperty_new_dtstart(
 475                                 icaltime_from_webform("dtstart")
 476                         )
 477                 );
 478
 479                 while (prop = icalcomponent_get_first_property(vtodo,
 480                       ICAL_DUE_PROPERTY), prop != NULL) {
 481                         icalcomponent_remove_property(vtodo, prop);
 482                 }
 483                 icalcomponent_add_property(vtodo,
 484                         icalproperty_new_due(
 485                                 icaltime_from_webform("due")
 486                         )
 487                 );
 488
 489                 /* Serialize it and save it to the message base */
 490                 serv_puts("ENT0 1|||4");
 491                 serv_gets(buf);
 492                 if (buf[0] == '4') {
 493                         serv_puts("Content-type: text/calendar");
 494                         serv_puts("");
 495                         serv_puts(icalcomponent_as_ical_string(vtodo));
 496                         serv_puts("000");
 497
 498                         /* Probably not necessary; the server will see the UID
 499                          * of the object and delete the old one anyway, but
 500                          * just in case...
 501                          */
 502                         delete_existing = 1;
 503                 }
 504         }
 505
 506         /*
 507          * If the user clicked 'Delete' then explicitly delete the message.
 508          */
 509         if (!strcasecmp(bstr("sc"), "Delete")) {
 510                 delete_existing = 1;
 511         }
 512
 513         if ( (delete_existing) && (msgnum > 0L) ) {
 514                 serv_printf("DELE %ld", atol(bstr("msgnum")));
 515                 serv_gets(buf);
 516         }
 517
 518         if (created_new_vtodo) {
 519                 icalcomponent_free(vtodo);
 520         }
 521
 522         /* Go back to the task list */
 523         readloop("readfwd");
 524 }
 525
 526
 527
 528 /*
 529  * Code common to all display handlers.  Given a message number and a MIME
 530  * type, we load the message and hunt for that MIME type.  If found, we load
 531  * the relevant part, deserialize it into a libical component, filter it for
 532  * the requested object type, and feed it to the specified handler.
 533  */
 534 void display_using_handler(long msgnum,
 535                         char *mimetype,
 536                         icalcomponent_kind which_kind,
 537                         void (*callback)(icalcomponent *, long)
 538         ) {
 539         char buf[SIZ];
 540         char mime_partnum[SIZ];
 541         char mime_filename[SIZ];
 542         char mime_content_type[SIZ];
 543         char mime_disposition[SIZ];
 544         int mime_length;
 545         char relevant_partnum[SIZ];
 546         char *relevant_source = NULL;
 547         icalcomponent *cal, *c;
 548
 549         sprintf(buf, "MSG0 %ld|1", msgnum);     /* ask for headers only */
 550         serv_puts(buf);
 551         serv_gets(buf);
 552         if (buf[0] != '1') return;
 553
 554         while (serv_gets(buf), strcmp(buf, "000")) {
 555                 if (!strncasecmp(buf, "part=", 5)) {
 556                         extract(mime_filename, &buf[5], 1);
 557                         extract(mime_partnum, &buf[5], 2);
 558                         extract(mime_disposition, &buf[5], 3);
 559                         extract(mime_content_type, &buf[5], 4);
 560                         mime_length = extract_int(&buf[5], 5);
 561
 562                         if (!strcasecmp(mime_content_type, "text/calendar")) {
 563                                 strcpy(relevant_partnum, mime_partnum);
 564                         }
 565
 566                 }
 567         }
 568
 569         if (strlen(relevant_partnum) > 0) {
 570                 relevant_source = load_mimepart(msgnum, relevant_partnum);
 571                 if (relevant_source != NULL) {
 572
 573                         cal = icalcomponent_new_from_string(relevant_source);
 574                         if (cal != NULL) {
 575
 576                                 /* Simple components of desired type */
 577                                 if (icalcomponent_isa(cal) == which_kind) {
 578                                         callback(cal, msgnum);
 579                                 }
 580
 581                                 /* Subcomponents of desired type */
 582                                 for (c = icalcomponent_get_first_component(cal,
 583                                     which_kind);
 584                                     (c != 0);
 585                                     c = icalcomponent_get_next_component(cal,
 586                                     which_kind)) {
 587                                         callback(c, msgnum);
 588                                 }
 589                                 icalcomponent_free(cal);
 590                         }
 591                         free(relevant_source);
 592                 }
 593         }
 594
 595 }
 596
 597 void display_calendar(long msgnum) {
 598         display_using_handler(msgnum, "text/calendar",
 599                                 ICAL_VEVENT_COMPONENT,
 600                                 display_individual_cal);
 601 }
 602
 603 void display_task(long msgnum) {
 604         display_using_handler(msgnum, "text/calendar",
 605                                 ICAL_VTODO_COMPONENT,
 606                                 display_individual_task);
 607 }
 608
 609 void display_edit_task(void) {
 610         long msgnum = 0L;
 611
 612         msgnum = atol(bstr("msgnum"));
 613         if (msgnum > 0L) {
 614                 /* existing task */
 615                 display_using_handler(msgnum, "text/calendar",
 616                                 ICAL_VTODO_COMPONENT,
 617                                 display_edit_individual_task);
 618         }
 619         else {
 620                 /* new task */
 621                 display_edit_individual_task(NULL, 0L);
 622         }
 623 }
 624
 625 void save_task(void) {
 626         long msgnum = 0L;
 627
 628         msgnum = atol(bstr("msgnum"));
 629         if (msgnum > 0L) {
 630                 display_using_handler(msgnum, "text/calendar",
 631                                 ICAL_VTODO_COMPONENT,
 632                                 save_individual_task);
 633         }
 634         else {
 635                 save_individual_task(NULL, 0L);
 636         }
 637 }
 638
 639 void display_edit_event(void) {
 640         long msgnum = 0L;
 641
 642         msgnum = atol(bstr("msgnum"));
 643         if (msgnum > 0L) {
 644                 /* existing event */
 645                 display_using_handler(msgnum, "text/calendar",
 646                                 ICAL_VEVENT_COMPONENT,
 647                                 display_edit_individual_event);
 648         }
 649         else {
 650                 /* new event */
 651                 display_edit_individual_event(NULL, 0L);
 652         }
 653 }
 654
 655 void save_event(void) {
 656         long msgnum = 0L;
 657
 658         msgnum = atol(bstr("msgnum"));
 659
 660         if (msgnum > 0L) {
 661                 display_using_handler(msgnum, "text/calendar",
 662                                 ICAL_VEVENT_COMPONENT,
 663                                 save_individual_event);
 664         }
 665         else {
 666                 save_individual_event(NULL, 0L);
 667         }
 668 }
 669
 670 #endif /* HAVE_ICAL_H */