webcit/webcit.c

   1 /*
   2  * This is the main transaction loop of the web service.  It maintains a
   3  * persistent session to the Citadel server, handling HTTP WebCit requests as
   4  * they arrive and presenting a user interface.
   5  *
   6  * Copyright (c) 1996-2011 by the citadel.org team
   7  *
   8  * This program is open source software.  You can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License as
  10  * published by the Free Software Foundation; either version 3 of the
  11  * License, or (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  21  */
  22
  23 #define SHOW_ME_VAPPEND_PRINTF
  24 #include <stdio.h>
  25 #include <stdarg.h>
  26 #include "webcit.h"
  27 #include "groupdav.h"
  28 #include "webserver.h"
  29
  30 StrBuf *csslocal = NULL;
  31 HashList *HandlerHash = NULL;
  32
  33 void PutRequestLocalMem(void *Data, DeleteHashDataFunc DeleteIt)
  34 {
  35         wcsession *WCC = WC;
  36         int n;
  37
  38         n = GetCount(WCC->Hdr->HTTPHeaders);
  39         Put(WCC->Hdr->HTTPHeaders, IKEY(n), Data, DeleteIt);
  40 }
  41
  42 void DeleteWebcitHandler(void *vHandler)
  43 {
  44         WebcitHandler *Handler = (WebcitHandler*) vHandler;
  45         FreeStrBuf(&Handler->Name);
  46         FreeStrBuf(&Handler->DisplayName);
  47         free (Handler);
  48 }
  49
  50 void WebcitAddUrlHandler(const char * UrlString, long UrlSLen,
  51                          const char *DisplayName, long dslen,
  52                          WebcitHandlerFunc F,
  53                          long Flags)
  54 {
  55         WebcitHandler *NewHandler;
  56         NewHandler = (WebcitHandler*) malloc(sizeof(WebcitHandler));
  57         NewHandler->F = F;
  58         NewHandler->Flags = Flags;
  59         NewHandler->Name = NewStrBufPlain(UrlString, UrlSLen);
  60         StrBufShrinkToFit(NewHandler->Name, 1);
  61         NewHandler->DisplayName = NewStrBufPlain(DisplayName, dslen);
  62         StrBufShrinkToFit(NewHandler->DisplayName, 1);
  63         Put(HandlerHash, UrlString, UrlSLen, NewHandler, DeleteWebcitHandler);
  64 }
  65
  66 void tmplput_HANDLER_DISPLAYNAME(StrBuf *Target, WCTemplputParams *TP)
  67 {
  68         wcsession *WCC = WC;
  69         if (WCC->Hdr->HR.Handler != NULL)
  70                 StrBufAppendTemplate(Target, TP, WCC->Hdr->HR.Handler->DisplayName, 0);
  71 }
  72
  73
  74 /*
  75  * web-printing funcion. uses our vsnprintf wrapper
  76  */
  77 #ifdef UBER_VERBOSE_DEBUGGING
  78 void wcc_printf(const char *FILE, const char *FUNCTION, long LINE, const char *format,...)
  79 #else
  80 void wc_printf(const char *format,...)
  81 #endif
  82 {
  83         wcsession *WCC = WC;
  84         va_list arg_ptr;
  85
  86         if (WCC->WBuf == NULL)
  87                 WCC->WBuf = NewStrBuf();
  88 #ifdef UBER_VERBOSE_DEBUGGING
  89         StrBufAppendPrintf(WCC->WBuf, "\n%s:%s:%d[", FILE, FUNCTION, LINE);
  90 #endif
  91
  92         va_start(arg_ptr, format);
  93         StrBufVAppendPrintf(WCC->WBuf, format, arg_ptr);
  94         va_end(arg_ptr);
  95 #ifdef UBER_VERBOSE_DEBUGGING
  96         StrBufAppendPrintf(WCC->WBuf, "]\n");
  97 #endif
  98 }
  99
 100 /*
 101  * http-header-printing funcion. uses our vsnprintf wrapper
 102  */
 103 void hprintf(const char *format,...)
 104 {
 105         wcsession *WCC = WC;
 106         va_list arg_ptr;
 107
 108         va_start(arg_ptr, format);
 109         StrBufVAppendPrintf(WCC->HBuf, format, arg_ptr);
 110         va_end(arg_ptr);
 111 }
 112
 113
 114
 115 /*
 116  * wrap up an HTTP session, closes tags, etc.
 117  *
 118  * print_standard_html_footer should be set to:
 119  * 0            - to transmit only,
 120  * nonzero      - to append the closing tags
 121  */
 122 void wDumpContent(int print_standard_html_footer)
 123 {
 124         if (print_standard_html_footer) {
 125                 wc_printf("</div> <!-- end of 'content' div -->\n");
 126                 do_template("trailing", NULL);
 127         }
 128
 129         /* If we've been saving it all up for one big output burst,
 130          * go ahead and do that now.
 131          */
 132         end_burst();
 133 }
 134
 135
 136
 137
 138 /*
 139  * Output HTTP headers and leading HTML for a page
 140  */
 141 void output_headers(    int do_httpheaders,     /* 1 = output HTTP headers                        */
 142                         int do_htmlhead,        /* 1 = output HTML <head> section and <body> opener */
 143
 144                         int do_room_banner,     /* 0=no, 1=yes,
 145                                                  * 2 = I'm going to embed my own, so don't open the
 146                                                  *     <div id="content"> either.
 147                                                  */
 148
 149                         int unset_cookies,      /* 1 = session is terminating, so unset the cookies */
 150                         int suppress_check,     /* 1 = suppress check for instant messages        */
 151                         int cache               /* 1 = allow browser to cache this page      */
 152 ) {
 153         wcsession *WCC = WC;
 154         char httpnow[128];
 155
 156         hprintf("HTTP/1.1 200 OK\n");
 157         http_datestring(httpnow, sizeof httpnow, time(NULL));
 158
 159         if (do_httpheaders) {
 160                 if (WCC->serv_info != NULL)
 161                         hprintf("Content-type: text/html; charset=utf-8\r\n"
 162                                 "Server: %s / %s\n"
 163                                 "Connection: close\r\n",
 164                                 PACKAGE_STRING,
 165                                 ChrPtr(WCC->serv_info->serv_software));
 166                 else
 167                         hprintf("Content-type: text/html; charset=utf-8\r\n"
 168                                 "Server: %s / [n/a]\n"
 169                                 "Connection: close\r\n",
 170                                 PACKAGE_STRING);
 171         }
 172
 173         if (cache > 0) {
 174                 char httpTomorow[128];
 175
 176                 http_datestring(httpTomorow, sizeof httpTomorow,
 177                                 time(NULL) + 60 * 60 * 24 * 2);
 178
 179                 hprintf("Pragma: public\r\n"
 180                         "Cache-Control: max-age=3600, must-revalidate\r\n"
 181                         "Last-modified: %s\r\n"
 182                         "Expires: %s\r\n",
 183                         httpnow,
 184                         httpTomorow
 185                 );
 186         }
 187         else {
 188                 hprintf("Pragma: no-cache\r\n"
 189                         "Cache-Control: no-store\r\n"
 190                         "Expires: -1\r\n"
 191                 );
 192         }
 193
 194         if (cache < 2) stuff_to_cookie(unset_cookies);
 195
 196         if (do_htmlhead) {
 197                 begin_burst();
 198                 do_template("head", NULL);
 199
 200                 /* check for ImportantMessages (these display in a div overlaying the main screen) */
 201                 if (!IsEmptyStr(WCC->ImportantMessage)) {
 202                         wc_printf("<div id=\"important_message\">\n"
 203                                 "<span class=\"imsg\">");
 204                         StrEscAppend(WCC->WBuf, NULL, WCC->ImportantMessage, 0, 0);
 205                         wc_printf("</span><br>\n"
 206                                 "</div>\n"
 207                         );
 208                         StrBufAppendBufPlain(WCC->trailing_javascript,
 209                                              HKEY("setTimeout('hide_imsg_popup()', 5000);       \n"),
 210                                              0
 211                         );
 212                         WCC->ImportantMessage[0] = 0;
 213                 }
 214                 else if (StrLength(WCC->ImportantMsg) > 0) {
 215                         wc_printf("<div id=\"important_message\">\n"
 216                                 "<span class=\"imsg\">");
 217                         StrEscAppend(WCC->WBuf, WCC->ImportantMsg, NULL, 0, 0);
 218                         wc_printf("</span><br>\n"
 219                                 "</div>\n"
 220                         );
 221                         StrBufAppendBufPlain(WCC->trailing_javascript,
 222                                              HKEY("setTimeout('hide_imsg_popup()', 5000);       \n"),
 223                                              0
 224                         );
 225                         FlushStrBuf(WCC->ImportantMsg);
 226                 }
 227                 if ( (WCC->logged_in) && (!unset_cookies) ) {
 228                         DoTemplate(HKEY("paging"), NULL, &NoCtx);
 229                 }
 230
 231                 if (do_room_banner == 1) {
 232                         tmplput_roombanner(NULL, NULL);
 233                 }
 234         }
 235
 236         if (do_room_banner == 1) {
 237                 wc_printf("<div id=\"content\">\n");
 238         }
 239 }
 240
 241 void output_custom_content_header(const char *ctype) {
 242   hprintf("HTTP/1.1 200 OK\r\n");
 243   hprintf("Content-type: %s; charset=utf-8\r\n",ctype);
 244   hprintf("Server: %s / %s\r\n", PACKAGE_STRING, ChrPtr(WC->serv_info->serv_software));
 245   hprintf("Connection: close\r\n");
 246 }
 247
 248
 249 /*
 250  * Generic function to do an HTTP redirect.  Easy and fun.
 251  */
 252 void http_redirect(const char *whichpage) {
 253         hprintf("HTTP/1.1 302 Moved Temporarily\n");
 254         hprintf("Location: %s\r\n", whichpage);
 255         hprintf("URI: %s\r\n", whichpage);
 256         hprintf("Content-type: text/html; charset=utf-8\r\n");
 257         begin_burst();
 258         wc_printf("<html><body>");
 259         wc_printf("Go <a href=\"%s\">here</A>.", whichpage);
 260         wc_printf("</body></html>\n");
 261         end_burst();
 262 }
 263
 264
 265
 266 /*
 267  * Output a piece of content to the web browser using conformant HTTP and MIME semantics
 268  */
 269 void http_transmit_thing(const char *content_type, int is_static)
 270 {
 271
 272         syslog(9, "http_transmit_thing(%s)%s\n", content_type, ((is_static > 0) ? " (static)" : ""));
 273         output_headers(0, 0, 0, 0, 0, is_static);
 274
 275         hprintf("Content-type: %s\r\n"
 276                 "Server: %s\r\n"
 277                 "Connection: close\r\n",
 278                 content_type,
 279                 PACKAGE_STRING);
 280
 281         end_burst();
 282 }
 283
 284
 285 /*
 286  * Convenience functions to display a page containing only a string
 287  *
 288  * titlebarcolor        color of the titlebar of the frame
 289  * titlebarmsg          text to display in the title bar
 290  * messagetext          body of the box
 291  */
 292 void convenience_page(const char *titlebarcolor, const char *titlebarmsg, const char *messagetext)
 293 {
 294         hprintf("HTTP/1.1 200 OK\n");
 295         output_headers(1, 1, 2, 0, 0, 0);
 296         wc_printf("<div id=\"banner\">\n");
 297         wc_printf("<table width=100%% border=0 bgcolor=\"#%s\"><tr><td>", titlebarcolor);
 298         wc_printf("<span class=\"titlebar\">%s</span>\n", titlebarmsg);
 299         wc_printf("</td></tr></table>\n");
 300         wc_printf("</div>\n<div id=\"content\">\n");
 301         escputs(messagetext);
 302
 303         wc_printf("<hr />\n");
 304         wDumpContent(1);
 305 }
 306
 307
 308 /*
 309  * Display a blank page.
 310  */
 311 void blank_page(void) {
 312         output_headers(1, 1, 0, 0, 0, 0);
 313         wDumpContent(2);
 314 }
 315
 316
 317 /*
 318  * A template has been requested
 319  */
 320 void url_do_template(void) {
 321         const StrBuf *MimeType;
 322         const StrBuf *Tmpl = sbstr("template");
 323         begin_burst();
 324         MimeType = DoTemplate(SKEY(Tmpl), NULL, &NoCtx);
 325         http_transmit_thing(ChrPtr(MimeType), 0);
 326 }
 327
 328
 329
 330 /*
 331  * convenience function to indicate success
 332  */
 333 void display_success(char *successmessage)
 334 {
 335         convenience_page("007700", "OK", successmessage);
 336 }
 337
 338
 339 /*
 340  * Authorization required page (sends a 401, causing the browser to request login credentials)
 341  */
 342 void authorization_required(void)
 343 {
 344         wcsession *WCC = WC;
 345         const char *message = "";
 346
 347         hprintf("HTTP/1.1 401 Authorization Required\r\n");
 348         hprintf(
 349                 "Server: %s / %s\r\n"
 350                 "Connection: close\r\n",
 351                 PACKAGE_STRING, ChrPtr(WC->serv_info->serv_software)
 352         );
 353         hprintf("WWW-Authenticate: Basic realm=\"%s\"\r\n", ChrPtr(WC->serv_info->serv_humannode));
 354         hprintf("Content-Type: text/html\r\n");
 355         begin_burst();
 356         wc_printf("<h1>");
 357         wc_printf(_("Authorization Required"));
 358         wc_printf("</h1>\r\n");
 359
 360
 361         if (WCC->ImportantMsg != NULL)
 362                 message = ChrPtr(WCC->ImportantMsg);
 363         else if (WCC->ImportantMessage != NULL)
 364                 message = WCC->ImportantMessage;
 365
 366         wc_printf(_("The resource you requested requires a valid username and password. "
 367                 "You could not be logged in: %s\n"), message);
 368         wDumpContent(0);
 369         end_webcit_session();
 370 }
 371
 372 /*
 373  * Convenience functions to wrap around asynchronous ajax responses
 374  */
 375 void begin_ajax_response(void) {
 376         wcsession *WCC = WC;
 377
 378         FlushStrBuf(WCC->HBuf);
 379         output_headers(0, 0, 0, 0, 0, 0);
 380
 381         hprintf("Content-type: text/html; charset=UTF-8\r\n"
 382                 "Server: %s\r\n"
 383                 "Connection: close\r\n"
 384                 ,
 385                 PACKAGE_STRING);
 386         begin_burst();
 387 }
 388
 389 /*
 390  * print ajax response footer
 391  */
 392 void end_ajax_response(void) {
 393         wDumpContent(0);
 394 }
 395
 396
 397
 398 /*
 399  * Wraps a Citadel server command in an AJAX transaction.
 400  */
 401 void ajax_servcmd(void)
 402 {
 403         wcsession *WCC = WC;
 404         int Done = 0;
 405         StrBuf *Buf;
 406         char *junk;
 407         size_t len;
 408
 409         syslog(LOG_DEBUG, "ajax_servcmd() g_cmd=\"%s\"\n", bstr("g_cmd") );
 410         begin_ajax_response();
 411         Buf = NewStrBuf();
 412         serv_puts(bstr("g_cmd"));
 413         StrBuf_ServGetln(Buf);
 414         StrBufAppendBuf(WCC->WBuf, Buf, 0);
 415         StrBufAppendBufPlain(WCC->WBuf, HKEY("\n"), 0);
 416
 417         switch (GetServerStatus(Buf, NULL)) {
 418         case 8:
 419                 serv_puts("\n\n000");
 420                 if ( (StrLength(Buf)==3) &&
 421                      !strcmp(ChrPtr(Buf), "000")) {
 422                         StrBufAppendBufPlain(WCC->WBuf, HKEY("\000"), 0);
 423                         break;
 424                 }
 425         case 1:
 426                 while (!Done) {
 427                         StrBuf_ServGetln(Buf);
 428                         if ( (StrLength(Buf)==3) &&
 429                              !strcmp(ChrPtr(Buf), "000")) {
 430                                 Done = 1;
 431                         }
 432                         StrBufAppendBuf(WCC->WBuf, Buf, 0);
 433                         StrBufAppendBufPlain(WCC->WBuf, HKEY("\n"), 0);
 434                 }
 435                 break;
 436         case 4:
 437                 text_to_server(bstr("g_input"));
 438                 serv_puts("000");
 439                 break;
 440         case 6:
 441                 len = atol(&ChrPtr(Buf)[4]);
 442                 StrBuf_ServGetBLOBBuffered(Buf, len);
 443                 break;
 444         case 7:
 445                 len = atol(&ChrPtr(Buf)[4]);
 446                 junk = malloc(len);
 447                 memset(junk, 0, len);
 448                 serv_write(junk, len);
 449                 free(junk);
 450         }
 451
 452         end_ajax_response();
 453
 454         /*
 455          * This is kind of an ugly hack, but this is the only place it can go.
 456          * If the command was GEXP, then the instant messenger window must be
 457          * running, so reset the "last_pager_check" watchdog timer so
 458          * that page_popup() doesn't try to open it a second time.
 459          */
 460         if (!strncasecmp(bstr("g_cmd"), "GEXP", 4)) {
 461                 WCC->last_pager_check = time(NULL);
 462         }
 463         FreeStrBuf(&Buf);
 464 }
 465
 466
 467 /*
 468  * Helper function for the asynchronous check to see if we need
 469  * to open the instant messenger window.
 470  */
 471 void seconds_since_last_gexp(void)
 472 {
 473         char buf[256];
 474
 475         if ( (time(NULL) - WC->last_pager_check) < 30) {
 476                 wc_printf("NO\n");
 477         }
 478         else {
 479                 memset(buf, 0, 5);
 480                 serv_puts("NOOP");
 481                 serv_getln(buf, sizeof buf);
 482                 if (buf[3] == '*') {
 483                         wc_printf("YES");
 484                 }
 485                 else {
 486                         wc_printf("NO");
 487                 }
 488         }
 489 }
 490
 491
 492 /*
 493  * Save a URL destination so we can go to it later
 494  */
 495 void push_destination(void) {
 496         wcsession *WCC = WC;
 497
 498         if (!WCC) {
 499                 wc_printf("no session");
 500                 return;
 501         }
 502
 503         FreeStrBuf(&WCC->PushedDestination);
 504         WCC->PushedDestination = NewStrBufDup(SBSTR("url"));
 505         syslog(9, "Push: %s\n", ChrPtr(WCC->PushedDestination));
 506         wc_printf("OK");
 507 }
 508
 509 /*
 510  * Go to the URL saved by push_destination()
 511  */
 512 void pop_destination(void) {
 513         wcsession *WCC = WC;
 514
 515         if ((WCC) && (WCC->need_regi)) {
 516                 WCC->need_regi = 0;
 517                 display_reg(1);
 518                 return;
 519         }
 520
 521         if ( (!WCC) || (WCC->PushedDestination == NULL) || (StrLength(WCC->PushedDestination) == 0) ) {
 522                 do_welcome();
 523                 return;
 524         }
 525
 526         syslog(9, "Pop: %s\n", ChrPtr(WCC->PushedDestination));
 527         http_redirect(ChrPtr(WCC->PushedDestination));
 528 }
 529
 530
 531
 532 int ReadPostData(void)
 533 {
 534         int rc;
 535         int urlencoded_post = 0;
 536         wcsession *WCC = WC;
 537         StrBuf *content = NULL;
 538
 539         urlencoded_post = (strncasecmp(ChrPtr(WCC->Hdr->HR.ContentType), "application/x-www-form-urlencoded", 33) == 0) ;
 540
 541         content = NewStrBufPlain(NULL, WCC->Hdr->HR.ContentLength + 256);
 542
 543         if (!urlencoded_post)
 544         {
 545                 StrBufPrintf(content,
 546                      "Content-type: %s\n"
 547                              "Content-length: %ld\n\n",
 548                              ChrPtr(WCC->Hdr->HR.ContentType),
 549                              WCC->Hdr->HR.ContentLength);
 550         }
 551
 552         /** Read the entire input data at once. */
 553         rc = client_read_to(WCC->Hdr, content,
 554                             WCC->Hdr->HR.ContentLength,
 555                             SLEEPING);
 556         if (rc < 0)
 557                 return rc;
 558
 559
 560         if (urlencoded_post) {
 561                 ParseURLParams(content);
 562         } else if (!strncasecmp(ChrPtr(WCC->Hdr->HR.ContentType), "multipart", 9)) {
 563                 char *Buf;
 564                 char *BufEnd;
 565                 long len;
 566
 567                 len = StrLength(content);
 568                 Buf = SmashStrBuf(&content);
 569                 BufEnd = Buf + len;
 570                 mime_parser(Buf, BufEnd, *upload_handler, NULL, NULL, NULL, 0);
 571                 free(Buf);
 572         } else if (WCC->Hdr->HR.ContentLength > 0) {
 573                 WCC->upload = content;
 574                 WCC->upload_length = StrLength(WCC->upload);
 575                 content = NULL;
 576         }
 577         FreeStrBuf(&content);
 578         return 1;
 579 }
 580
 581
 582 void ParseREST_URL(void)
 583 {
 584         StrBuf *Buf;
 585         StrBuf *pFloor = NULL;
 586         wcsession *WCC = WC;
 587         long i = 0;
 588         const char *pCh = NULL;
 589         HashList *Floors;
 590         void *vFloor;
 591
 592         syslog(1, "parsing rest URL: %s\n", ChrPtr(WCC->Hdr->HR.ReqLine));
 593
 594         WCC->Directory = NewHash(1, Flathash);
 595         WCC->CurrentFloor = NULL;
 596
 597         Buf = NewStrBuf();
 598         while (StrBufExtract_NextToken(Buf, WCC->Hdr->HR.ReqLine, &pCh,  '/') >= 0)
 599         {
 600                 if (StrLength(Buf) != 0) {
 601                         /* ignore empty path segments */
 602                         StrBufUnescape(Buf, 1);
 603                         Put(WCC->Directory, IKEY(i), Buf, HFreeStrBuf);
 604                         if (i==0)
 605                                 pFloor = Buf;
 606                         Buf = NewStrBuf();
 607                 }
 608                 i++;
 609         }
 610
 611         FreeStrBuf(&Buf);
 612         if (pFloor != NULL)
 613         {
 614                 Floors = GetFloorListHash(NULL, NULL);
 615
 616                 if (Floors != NULL)
 617                 {
 618                         if (GetHash(WCC->FloorsByName, SKEY(pFloor), &vFloor))
 619                                 WCC->CurrentFloor = (Floor*) vFloor;
 620                 }
 621         }
 622 }
 623
 624 int Conditional_REST_DEPTH(StrBuf *Target, WCTemplputParams *TP)
 625 {
 626         long Depth, IsDepth;
 627         long offset = 0;
 628         wcsession *WCC = WC;
 629
 630         if (WCC->Hdr->HR.Handler != NULL)
 631                 offset ++;
 632         Depth = GetTemplateTokenNumber(Target, TP, 2, 0);
 633         IsDepth = GetCount(WCC->Directory) + offset;
 634
 635 //      LogTemplateError(Target, "bla", 1, TP, "REST_DEPTH: %ld : %ld\n", Depth, IsDepth);
 636         if (Depth < 0) {
 637                 Depth = -Depth;
 638                 return IsDepth > Depth;
 639         }
 640         else
 641                 return Depth == IsDepth;
 642 }
 643
 644
 645
 646 /*
 647  * Entry point for WebCit transaction
 648  */
 649 void session_loop(void)
 650 {
 651         int Flags = 0;
 652         int xhttp;
 653         StrBuf *Buf;
 654
 655         /*
 656          * We stuff these with the values coming from the client cookies,
 657          * so we can use them to reconnect a timed out session if we have to.
 658          */
 659         wcsession *WCC;
 660
 661         WCC= WC;
 662         WCC->upload_length = 0;
 663         WCC->upload = NULL;
 664         WCC->Hdr->nWildfireHeaders = 0;
 665         if (WCC->Hdr->HR.Handler != NULL)
 666                 Flags = WCC->Hdr->HR.Handler->Flags; /* so we can temporarily add our own... */
 667
 668         if (WCC->Hdr->HR.ContentLength > 0) {
 669                 if (ReadPostData() < 0) {
 670                         return;
 671                 }
 672         }
 673
 674         Buf = NewStrBuf();
 675         WCC->trailing_javascript = NewStrBuf();
 676
 677         /* Convert base64-encoded URL's back to plain text */
 678         if (!strncmp(ChrPtr(WCC->Hdr->this_page), "/B64", 4)) {
 679                 StrBufCutLeft(WCC->Hdr->this_page, 4);
 680                 StrBufDecodeBase64(WCC->Hdr->this_page);
 681                 http_redirect(ChrPtr(WCC->Hdr->this_page));
 682                 goto SKIP_ALL_THIS_CRAP;
 683         }
 684
 685         /* If there are variables in the URL, we must grab them now */
 686         if (WCC->Hdr->PlainArgs != NULL)
 687                 ParseURLParams(WCC->Hdr->PlainArgs);
 688
 689         /* If the client sent a nonce that is incorrect, kill the request. */
 690         if (havebstr("nonce")) {
 691                 syslog(9, "Comparing supplied nonce %s to session nonce %d\n",
 692                         bstr("nonce"), WCC->nonce
 693                 );
 694                 if (ibstr("nonce") != WCC->nonce) {
 695                         syslog(9, "Ignoring request with mismatched nonce.\n");
 696                         hprintf("HTTP/1.1 404 Security check failed\r\n");
 697                         hprintf("Content-Type: text/plain\r\n");
 698                         begin_burst();
 699                         wc_printf("Security check failed.\r\n");
 700                         end_burst();
 701                         goto SKIP_ALL_THIS_CRAP;
 702                 }
 703         }
 704
 705         /*
 706          * If we're not connected to a Citadel server, try to hook up the connection now.
 707          */
 708         if (!WCC->connected) {
 709                 if (GetConnected()) {
 710                         hprintf("HTTP/1.1 503 Service Unavailable\r\n");
 711                         hprintf("Content-Type: text/html\r\n");
 712                         begin_burst();
 713                         wc_printf("<html><head><title>503 Service Unavailable</title></head><body>\n");
 714                         wc_printf(_("This program was unable to connect or stay "
 715                                 "connected to the Citadel server.  Please report "
 716                                 "this problem to your system administrator.")
 717                         );
 718                         wc_printf("<br>");
 719                         wc_printf("<a href=\"http://www.citadel.org/doku.php/"
 720                                 "faq:generalquestions:webcit_unable_to_connect\">%s</a>",
 721                                 _("Read More...")
 722                         );
 723                         wc_printf("</body></html>\n");
 724                         end_burst();
 725                         goto SKIP_ALL_THIS_CRAP;
 726                 }
 727         }
 728
 729         /*
 730          * If we're not logged in, but we have authentication data (either from
 731          * a cookie or from http-auth), try logging in to Citadel using that.
 732          */
 733         if ((!WCC->logged_in)
 734             && (StrLength(WCC->Hdr->c_username) > 0)
 735             && (StrLength(WCC->Hdr->c_password) > 0))
 736         {
 737                 long Status;
 738
 739                 FlushStrBuf(Buf);
 740                 serv_printf("USER %s", ChrPtr(WCC->Hdr->c_username));
 741                 StrBuf_ServGetln(Buf);
 742                 if (GetServerStatus(Buf, &Status) == 3) {
 743                         serv_printf("PASS %s", ChrPtr(WCC->Hdr->c_password));
 744                         StrBuf_ServGetln(Buf);
 745                         if (GetServerStatus(Buf, NULL) == 2) {
 746                                 become_logged_in(WCC->Hdr->c_username,
 747                                                  WCC->Hdr->c_password, Buf);
 748                         } else {
 749                                 /* Should only display when password is wrong */
 750                                 WCC->ImportantMsg = NewStrBufPlain(ChrPtr(Buf) + 4, StrLength(Buf) - 4);
 751                                 authorization_required();
 752                                 FreeStrBuf(&Buf);
 753                                 goto SKIP_ALL_THIS_CRAP;
 754                         }
 755                 }
 756                 else if (Status == 541) {
 757                         WCC->logged_in = 1;
 758                 }
 759         }
 760
 761         xhttp = (WCC->Hdr->HR.eReqType != eGET) &&
 762                 (WCC->Hdr->HR.eReqType != ePOST) &&
 763                 (WCC->Hdr->HR.eReqType != eHEAD);
 764
 765         /*
 766          * If a 'go' (or 'gotofirst') parameter has been specified, attempt to goto that room
 767          * prior to doing anything else.
 768          */
 769         if (havebstr("go")) {
 770                 int ret;
 771                 syslog(9, "Explicit room selection: %s\n", bstr("go"));
 772                 ret = gotoroom(sbstr("go"));    /* do quietly to avoid session output! */
 773                 if ((ret/100) != 2) {
 774                         syslog(1, "Unable to change to [%s]; Reason: %d\n", bstr("go"), ret);
 775                 }
 776         }
 777         else if (havebstr("gotofirst")) {
 778                 int ret;
 779                 syslog(9, "Explicit room selection: %s\n", bstr("gotofirst"));
 780                 ret = gotoroom(sbstr("gotofirst"));     /* do quietly to avoid session output! */
 781                 if ((ret/100) != 2) {
 782                         syslog(1, "Unable to change to [%s]; Reason: %d\n", bstr("gotofirst"), ret);
 783                 }
 784         }
 785
 786         /*
 787          * If we aren't in any room yet, but we have cookie data telling us where we're
 788          * supposed to be, and 'go' was not specified, then go there.
 789          */
 790         else if ( (StrLength(WCC->CurRoom.name) == 0) && ( (StrLength(WCC->Hdr->c_roomname) > 0) )) {
 791                 int ret;
 792
 793                 syslog(9, "We are in '%s' but cookie indicates '%s', going there...\n",
 794                         ChrPtr(WCC->CurRoom.name),
 795                         ChrPtr(WCC->Hdr->c_roomname)
 796                 );
 797                 ret = gotoroom(WCC->Hdr->c_roomname);   /* do quietly to avoid session output! */
 798                 if ((ret/100) != 2) {
 799                         syslog(1, "COOKIEGOTO: Unable to change to [%s]; Reason: %d\n",
 800                                 ChrPtr(WCC->Hdr->c_roomname), ret);
 801                 }
 802         }
 803
 804         if (WCC->Hdr->HR.Handler != NULL) {
 805                 if (    (!WCC->logged_in)
 806                         && ((WCC->Hdr->HR.Handler->Flags & ANONYMOUS) == 0)
 807                         && (WCC->serv_info->serv_supports_guest == 0)
 808                 ) {
 809                         display_login();
 810                 }
 811                 else {
 812 /*
 813                         if ((WCC->Hdr->HR.Handler->Flags & PARSE_REST_URL) != 0)
 814                                 ParseREST_URL();
 815 */
 816                         if ((WCC->Hdr->HR.Handler->Flags & AJAX) != 0)
 817                                 begin_ajax_response();
 818                         WCC->Hdr->HR.Handler->F();
 819                         if ((WCC->Hdr->HR.Handler->Flags & AJAX) != 0)
 820                                 end_ajax_response();
 821                 }
 822         }
 823         /* When all else fails, display the default landing page or a main menu. */
 824         else {
 825                 /*
 826                  * ordinary browser users get a nice login screen, DAV etc. requsets
 827                  * are given a 401 so they can handle it appropriate.
 828                  */
 829                 if (!WCC->logged_in)  {
 830                         if (xhttp) {
 831                                 authorization_required();
 832                         }
 833                         else {
 834                                 display_default_landing_page();
 835                         }
 836                 }
 837                 /*
 838                  * Toplevel dav requests? or just a flat browser request?
 839                  */
 840                 else {
 841                         if (xhttp)
 842                                 groupdav_main();
 843                         else
 844                                 display_main_menu();
 845                 }
 846         }
 847
 848 SKIP_ALL_THIS_CRAP:
 849         FreeStrBuf(&Buf);
 850         fflush(stdout);
 851 }
 852
 853
 854
 855 /*
 856  * Display the appropriate landing page for this site.
 857  */
 858 void display_default_landing_page(void) {
 859         if (WC->serv_info->serv_supports_guest) {
 860                 /* default action.  probably revisit this. */
 861                 StrBuf *teh_lobby = NewStrBufPlain(HKEY("_BASEROOM_"));
 862                 smart_goto(teh_lobby);
 863                 FreeStrBuf(&teh_lobby);
 864         }
 865         else {
 866                 display_login();
 867         }
 868 }
 869
 870
 871 /*
 872  * Replacement for sleep() that uses select() in order to avoid SIGALRM
 873  */
 874 void sleeeeeeeeeep(int seconds)
 875 {
 876         struct timeval tv;
 877
 878         tv.tv_sec = seconds;
 879         tv.tv_usec = 0;
 880         select(0, NULL, NULL, NULL, &tv);
 881 }
 882
 883 int Conditional_IS_HTTPS(StrBuf *Target, WCTemplputParams *TP)
 884 {
 885         return is_https != 0;
 886 }
 887
 888 void AppendImportantMessage(const char *pch, long len)
 889 {
 890         wcsession *WCC = WC;
 891
 892         if (StrLength(WCC->ImportantMsg) > 0) {
 893                 StrBufAppendBufPlain(WCC->ImportantMsg, HKEY("\n"), 0);
 894         }
 895
 896         StrBufAppendBufPlain(WCC->ImportantMsg, pch, len, 0);
 897 }
 898
 899 int ConditionalImportantMesage(StrBuf *Target, WCTemplputParams *TP)
 900 {
 901         wcsession *WCC = WC;
 902         if (WCC != NULL)
 903                 return ((!IsEmptyStr(WCC->ImportantMessage)) ||
 904                         (StrLength(WCC->ImportantMsg) > 0));
 905         else
 906                 return 0;
 907 }
 908
 909 void tmplput_importantmessage(StrBuf *Target, WCTemplputParams *TP)
 910 {
 911         wcsession *WCC = WC;
 912
 913         if (WCC != NULL) {
 914                 if (!IsEmptyStr(WCC->ImportantMessage)) {
 915                         StrEscAppend(Target, NULL, WCC->ImportantMessage, 0, 0);
 916                         WCC->ImportantMessage[0] = '\0';
 917                 }
 918                 else if (StrLength(WCC->ImportantMsg) > 0) {
 919                         StrEscAppend(Target, WCC->ImportantMsg, NULL, 0, 0);
 920                         FlushStrBuf(WCC->ImportantMsg);
 921                 }
 922         }
 923 }
 924
 925 void tmplput_trailing_javascript(StrBuf *Target, WCTemplputParams *TP)
 926 {
 927         wcsession *WCC = WC;
 928
 929         if (WCC != NULL)
 930                 StrBufAppendTemplate(Target, TP, WCC->trailing_javascript, 0);
 931 }
 932
 933 void tmplput_csslocal(StrBuf *Target, WCTemplputParams *TP)
 934 {
 935         StrBufAppendBuf(Target,
 936                         csslocal, 0);
 937 }
 938
 939 extern char static_local_dir[PATH_MAX];
 940
 941
 942 void
 943 InitModule_WEBCIT
 944 (void)
 945 {
 946         char dir[SIZ];
 947         WebcitAddUrlHandler(HKEY("blank"), "", 0, blank_page, ANONYMOUS|COOKIEUNNEEDED|ISSTATIC);
 948         WebcitAddUrlHandler(HKEY("do_template"), "", 0, url_do_template, ANONYMOUS);
 949         WebcitAddUrlHandler(HKEY("sslg"), "", 0, seconds_since_last_gexp, AJAX|LOGCHATTY);
 950         WebcitAddUrlHandler(HKEY("ajax_servcmd"), "", 0, ajax_servcmd, 0);
 951         WebcitAddUrlHandler(HKEY("webcit"), "", 0, blank_page, URLNAMESPACE);
 952         WebcitAddUrlHandler(HKEY("push"), "", 0, push_destination, AJAX);
 953         WebcitAddUrlHandler(HKEY("pop"), "", 0, pop_destination, 0);
 954
 955         WebcitAddUrlHandler(HKEY("401"), "", 0, authorization_required, ANONYMOUS|COOKIEUNNEEDED);
 956         RegisterConditional(HKEY("COND:IMPMSG"), 0, ConditionalImportantMesage, CTX_NONE);
 957         RegisterConditional(HKEY("COND:REST:DEPTH"), 0, Conditional_REST_DEPTH, CTX_NONE);
 958         RegisterConditional(HKEY("COND:IS_HTTPS"), 0, Conditional_IS_HTTPS, CTX_NONE);
 959
 960         RegisterNamespace("CSSLOCAL", 0, 0, tmplput_csslocal, NULL, CTX_NONE);
 961         RegisterNamespace("IMPORTANTMESSAGE", 0, 0, tmplput_importantmessage, NULL, CTX_NONE);
 962         RegisterNamespace("TRAILING_JAVASCRIPT", 0, 0, tmplput_trailing_javascript, NULL, CTX_NONE);
 963         RegisterNamespace("URL:DISPLAYNAME", 0, 1, tmplput_HANDLER_DISPLAYNAME, NULL, CTX_NONE);
 964
 965
 966         snprintf(dir, SIZ, "%s/webcit.css", static_local_dir);
 967         if (!access(dir, R_OK)) {
 968                 syslog(9, "Using local Stylesheet [%s]\n", dir);
 969                 csslocal = NewStrBufPlain(HKEY("<link href=\"static.local/webcit.css\" rel=\"stylesheet\" type=\"text/css\" />"));
 970         }
 971         else
 972                 syslog(9, "No Site-local Stylesheet [%s] installed. \n", dir);
 973
 974 }
 975
 976 void
 977 ServerStartModule_WEBCIT
 978 (void)
 979 {
 980         HandlerHash = NewHash(1, NULL);
 981 }
 982
 983
 984 void
 985 ServerShutdownModule_WEBCIT
 986 (void)
 987 {
 988         FreeStrBuf(&csslocal);
 989         DeleteHash(&HandlerHash);
 990 }
 991
 992
 993
 994 void
 995 SessionNewModule_WEBCIT
 996 (wcsession *sess)
 997 {
 998         sess->ImportantMsg = NewStrBuf();
 999         sess->WBuf = NewStrBufPlain(NULL, SIZ * 4);
1000         sess->HBuf = NewStrBufPlain(NULL, SIZ / 4);
1001 }
1002
1003 void
1004 SessionDetachModule_WEBCIT
1005 (wcsession *sess)
1006 {
1007         DeleteHash(&sess->Directory);
1008
1009         FreeStrBuf(&sess->upload);
1010         sess->upload_length = 0;
1011
1012         FreeStrBuf(&sess->trailing_javascript);
1013
1014         if (StrLength(sess->WBuf) > SIZ * 30) /* Bigger than 120K? release. */
1015         {
1016                 FreeStrBuf(&sess->WBuf);
1017                 sess->WBuf = NewStrBuf();
1018         }
1019         else
1020                 FlushStrBuf(sess->WBuf);
1021         FlushStrBuf(sess->HBuf);
1022 }
1023
1024 void
1025 SessionDestroyModule_WEBCIT
1026 (wcsession *sess)
1027 {
1028         FreeStrBuf(&sess->WBuf);
1029         FreeStrBuf(&sess->HBuf);
1030         FreeStrBuf(&sess->ImportantMsg);
1031         FreeStrBuf(&sess->PushedDestination);
1032 }
1033