mdw@git.distorted.org.uk Git - disorder/blob - server/dcgi.c

   1 /*
   2  * This file is part of DisOrder.
   3  * Copyright (C) 2004, 2005, 2006, 2007 Richard Kettlewell
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  18  * USA
  19  */
  20
  21 #include <config.h>
  22 #include "types.h"
  23
  24 #include <stdio.h>
  25 #include <errno.h>
  26 #include <sys/types.h>
  27 #include <sys/socket.h>
  28 #include <stddef.h>
  29 #include <stdlib.h>
  30 #include <time.h>
  31 #include <unistd.h>
  32 #include <string.h>
  33 #include <sys/wait.h>
  34 #include <pcre.h>
  35 #include <assert.h>
  36
  37 #include "client.h"
  38 #include "mem.h"
  39 #include "vector.h"
  40 #include "sink.h"
  41 #include "cgi.h"
  42 #include "log.h"
  43 #include "configuration.h"
  44 #include "table.h"
  45 #include "queue.h"
  46 #include "plugin.h"
  47 #include "split.h"
  48 #include "wstat.h"
  49 #include "kvp.h"
  50 #include "syscalls.h"
  51 #include "printf.h"
  52 #include "regsub.h"
  53 #include "defs.h"
  54 #include "trackname.h"
  55 #include "charset.h"
  56 #include "dcgi.h"
  57 #include "url.h"
  58 #include "mime.h"
  59 #include "sendmail.h"
  60
  61 char *login_cookie;
  62
  63 static void expand(cgi_sink *output,
  64                    const char *template,
  65                    dcgi_state *ds);
  66 static void expandstring(cgi_sink *output,
  67                          const char *string,
  68                          dcgi_state *ds);
  69
  70 struct entry {
  71   const char *path;
  72   const char *sort;
  73   const char *display;
  74 };
  75
  76 static const char *nonce(void) {
  77   static unsigned long count;
  78   char *s;
  79
  80   byte_xasprintf(&s, "%lx%lx%lx",
  81            (unsigned long)time(0),
  82            (unsigned long)getpid(),
  83            count++);
  84   return s;
  85 }
  86
  87 static int compare_entry(const void *a, const void *b) {
  88   const struct entry *ea = a, *eb = b;
  89
  90   return compare_tracks(ea->sort, eb->sort,
  91                         ea->display, eb->display,
  92                         ea->path, eb->path);
  93 }
  94
  95 static const char *front_url(void) {
  96   char *url;
  97   const char *mgmt;
  98
  99   /* preserve management interface visibility */
 100   if((mgmt = cgi_get("mgmt")) && !strcmp(mgmt, "true")) {
 101     byte_xasprintf(&url, "%s?mgmt=true", config->url);
 102     return url;
 103   }
 104   return config->url;
 105 }
 106
 107 static void header_cookie(struct sink *output) {
 108   struct dynstr d[1];
 109   struct url u;
 110
 111   memset(&u, 0, sizeof u);
 112   dynstr_init(d);
 113   parse_url(config->url, &u);
 114   if(login_cookie) {
 115     dynstr_append_string(d, "disorder=");
 116     dynstr_append_string(d, quote822(login_cookie, 0));
 117   } else {
 118     /* Force browser to discard cookie */
 119     dynstr_append_string(d, "disorder=none;Max-Age=0");
 120   }
 121   if(u.path) {
 122     /* The default domain matches the request host, so we need not override
 123      * that.  But the default path only goes up to the rightmost /, which would
 124      * cause the browser to expose the cookie to other CGI programs on the same
 125      * web server. */
 126     dynstr_append_string(d, ";Path=");
 127     dynstr_append_string(d, quote822(u.path, 0));
 128   }
 129   dynstr_terminate(d);
 130   cgi_header(output, "Set-Cookie", d->vec);
 131 }
 132
 133 static void redirect(struct sink *output) {
 134   const char *back;
 135
 136   back = cgi_get("back");
 137   cgi_header(output, "Location", back && *back ? back : front_url());
 138   header_cookie(output);
 139   cgi_body(output);
 140 }
 141
 142 static void expand_template(dcgi_state *ds, cgi_sink *output,
 143                             const char *action) {
 144   cgi_header(output->sink, "Content-Type", "text/html");
 145   header_cookie(output->sink);
 146   cgi_body(output->sink);
 147   expand(output, action, ds);
 148 }
 149
 150 static void lookups(dcgi_state *ds, unsigned want) {
 151   unsigned need;
 152   struct queue_entry *r, *rnext;
 153   const char *dir, *re;
 154   char *rights;
 155
 156   if(ds->g->client && (need = want ^ (ds->g->flags & want)) != 0) {
 157     if(need & DC_QUEUE)
 158       disorder_queue(ds->g->client, &ds->g->queue);
 159     if(need & DC_PLAYING)
 160       disorder_playing(ds->g->client, &ds->g->playing);
 161     if(need & DC_NEW)
 162       disorder_new_tracks(ds->g->client, &ds->g->new, &ds->g->nnew, 0);
 163     if(need & DC_RECENT) {
 164       /* we need to reverse the order of the list */
 165       disorder_recent(ds->g->client, &r);
 166       while(r) {
 167         rnext = r->next;
 168         r->next = ds->g->recent;
 169         ds->g->recent = r;
 170         r = rnext;
 171       }
 172     }
 173     if(need & DC_VOLUME)
 174       disorder_get_volume(ds->g->client,
 175                           &ds->g->volume_left, &ds->g->volume_right);
 176     if(need & (DC_FILES|DC_DIRS)) {
 177       if(!(dir = cgi_get("directory")))
 178         dir = "";
 179       re = cgi_get("regexp");
 180       if(need & DC_DIRS)
 181         if(disorder_directories(ds->g->client, dir, re,
 182                                 &ds->g->dirs, &ds->g->ndirs))
 183           ds->g->ndirs = 0;
 184       if(need & DC_FILES)
 185         if(disorder_files(ds->g->client, dir, re,
 186                           &ds->g->files, &ds->g->nfiles))
 187           ds->g->nfiles = 0;
 188     }
 189     if(need & DC_RIGHTS) {
 190       ds->g->rights = RIGHT_READ;       /* fail-safe */
 191       if(!disorder_userinfo(ds->g->client, disorder_user(ds->g->client),
 192                             "rights", &rights))
 193         parse_rights(rights, &ds->g->rights, 1);
 194     }
 195     ds->g->flags |= need;
 196   }
 197 }
 198
 199 /* actions ********************************************************************/
 200
 201 static void act_disable(cgi_sink *output,
 202                         dcgi_state *ds) {
 203   if(ds->g->client)
 204     disorder_disable(ds->g->client);
 205   redirect(output->sink);
 206 }
 207
 208 static void act_enable(cgi_sink *output,
 209                               dcgi_state *ds) {
 210   if(ds->g->client)
 211     disorder_enable(ds->g->client);
 212   redirect(output->sink);
 213 }
 214
 215 static void act_random_disable(cgi_sink *output,
 216                                dcgi_state *ds) {
 217   if(ds->g->client)
 218     disorder_random_disable(ds->g->client);
 219   redirect(output->sink);
 220 }
 221
 222 static void act_random_enable(cgi_sink *output,
 223                               dcgi_state *ds) {
 224   if(ds->g->client)
 225     disorder_random_enable(ds->g->client);
 226   redirect(output->sink);
 227 }
 228
 229 static void act_remove(cgi_sink *output,
 230                        dcgi_state *ds) {
 231   const char *id;
 232
 233   if(!(id = cgi_get("id"))) fatal(0, "missing id argument");
 234   if(ds->g->client)
 235     disorder_remove(ds->g->client, id);
 236   redirect(output->sink);
 237 }
 238
 239 static void act_move(cgi_sink *output,
 240                      dcgi_state *ds) {
 241   const char *id, *delta;
 242
 243   if(!(id = cgi_get("id"))) fatal(0, "missing id argument");
 244   if(!(delta = cgi_get("delta"))) fatal(0, "missing delta argument");
 245   if(ds->g->client)
 246     disorder_move(ds->g->client, id, atoi(delta));
 247   redirect(output->sink);
 248 }
 249
 250 static void act_scratch(cgi_sink *output,
 251                         dcgi_state *ds) {
 252   if(ds->g->client)
 253     disorder_scratch(ds->g->client, cgi_get("id"));
 254   redirect(output->sink);
 255 }
 256
 257 static void act_playing(cgi_sink *output, dcgi_state *ds) {
 258   char r[1024];
 259   long refresh = config->refresh, length;
 260   time_t now, fin;
 261   int random_enabled = 0;
 262   int enabled = 0;
 263
 264   lookups(ds, DC_PLAYING|DC_QUEUE);
 265   cgi_header(output->sink, "Content-Type", "text/html");
 266   disorder_random_enabled(ds->g->client, &random_enabled);
 267   disorder_enabled(ds->g->client, &enabled);
 268   if(ds->g->playing
 269      && ds->g->playing->state == playing_started /* i.e. not paused */
 270      && !disorder_length(ds->g->client, ds->g->playing->track, &length)
 271      && length
 272      && ds->g->playing->sofar >= 0) {
 273     /* Try to put the next refresh at the start of the next track. */
 274     time(&now);
 275     fin = now + length - ds->g->playing->sofar + config->gap;
 276     if(now + refresh > fin)
 277       refresh = fin - now;
 278   }
 279   if(ds->g->queue && ds->g->queue->state == playing_isscratch) {
 280     /* next track is a scratch, don't leave more than the inter-track gap */
 281     if(refresh > config->gap)
 282       refresh = config->gap;
 283   }
 284   if(!ds->g->playing && ((ds->g->queue
 285                           && ds->g->queue->state != playing_random)
 286                          || random_enabled) && enabled) {
 287     /* no track playing but playing is enabled and there is something coming
 288      * up, must be in a gap */
 289     if(refresh > config->gap)
 290       refresh = config->gap;
 291   }
 292   byte_snprintf(r, sizeof r, "%ld;url=%s", refresh > 0 ? refresh : 1,
 293                 front_url());
 294   cgi_header(output->sink, "Refresh", r);
 295   header_cookie(output->sink);
 296   cgi_body(output->sink);
 297   expand(output, "playing", ds);
 298 }
 299
 300 static void act_play(cgi_sink *output,
 301                      dcgi_state *ds) {
 302   const char *track, *dir;
 303   char **tracks;
 304   int ntracks, n;
 305   struct entry *e;
 306
 307   if((track = cgi_get("file"))) {
 308     disorder_play(ds->g->client, track);
 309   } else if((dir = cgi_get("directory"))) {
 310     if(disorder_files(ds->g->client, dir, 0, &tracks, &ntracks)) ntracks = 0;
 311     if(ntracks) {
 312       e = xmalloc(ntracks * sizeof (struct entry));
 313       for(n = 0; n < ntracks; ++n) {
 314         e[n].path = tracks[n];
 315         e[n].sort = trackname_transform("track", tracks[n], "sort");
 316         e[n].display = trackname_transform("track", tracks[n], "display");
 317       }
 318       qsort(e, ntracks, sizeof (struct entry), compare_entry);
 319       for(n = 0; n < ntracks; ++n)
 320         disorder_play(ds->g->client, e[n].path);
 321     }
 322   }
 323   /* XXX error handling */
 324   redirect(output->sink);
 325 }
 326
 327 static int clamp(int n, int min, int max) {
 328   if(n < min)
 329     return min;
 330   if(n > max)
 331     return max;
 332   return n;
 333 }
 334
 335 static const char *volume_url(void) {
 336   char *url;
 337
 338   byte_xasprintf(&url, "%s?action=volume", config->url);
 339   return url;
 340 }
 341
 342 static void act_volume(cgi_sink *output, dcgi_state *ds) {
 343   const char *l, *r, *d, *back;
 344   int nd, changed = 0;;
 345
 346   if((d = cgi_get("delta"))) {
 347     lookups(ds, DC_VOLUME);
 348     nd = clamp(atoi(d), -255, 255);
 349     disorder_set_volume(ds->g->client,
 350                         clamp(ds->g->volume_left + nd, 0, 255),
 351                         clamp(ds->g->volume_right + nd, 0, 255));
 352     changed = 1;
 353   } else if((l = cgi_get("left")) && (r = cgi_get("right"))) {
 354     disorder_set_volume(ds->g->client, atoi(l), atoi(r));
 355     changed = 1;
 356   }
 357   if(changed) {
 358     /* redirect back to ourselves (but without the volume-changing bits in the
 359      * URL) */
 360     cgi_header(output->sink, "Location",
 361                (back = cgi_get("back")) ? back : volume_url());
 362     header_cookie(output->sink);
 363     cgi_body(output->sink);
 364   } else {
 365     cgi_header(output->sink, "Content-Type", "text/html");
 366     header_cookie(output->sink);
 367     cgi_body(output->sink);
 368     expand(output, "volume", ds);
 369   }
 370 }
 371
 372 static void act_prefs_errors(const char *msg,
 373                              void attribute((unused)) *u) {
 374   fatal(0, "error splitting parts list: %s", msg);
 375 }
 376
 377 static const char *numbered_arg(const char *argname, int numfile) {
 378   char *fullname;
 379
 380   byte_xasprintf(&fullname, "%d_%s", numfile, argname);
 381   return cgi_get(fullname);
 382 }
 383
 384 static void process_prefs(dcgi_state *ds, int numfile) {
 385   const char *file, *name, *value, *part, *parts, *current, *context;
 386   char **partslist;
 387
 388   if(!(file = numbered_arg("file", numfile)))
 389     /* The first file doesn't need numbering. */
 390     if(numfile > 0 || !(file = cgi_get("file")))
 391       return;
 392   if((parts = numbered_arg("parts", numfile))
 393      || (parts = cgi_get("parts"))) {
 394     /* Default context is display.  Other contexts not actually tested. */
 395     if(!(context = numbered_arg("context", numfile))) context = "display";
 396     partslist = split(parts, 0, 0, act_prefs_errors, 0);
 397     while((part = *partslist++)) {
 398       if(!(value = numbered_arg(part, numfile)))
 399         continue;
 400       /* If it's already right (whether regexps or db) don't change anything,
 401        * so we don't fill the database up with rubbish. */
 402       if(disorder_part(ds->g->client, (char **)&current,
 403                        file, context, part))
 404         fatal(0, "disorder_part() failed");
 405       if(!strcmp(current, value))
 406         continue;
 407       byte_xasprintf((char **)&name, "trackname_%s_%s", context, part);
 408       disorder_set(ds->g->client, file, name, value);
 409     }
 410     if((value = numbered_arg("random", numfile)))
 411       disorder_unset(ds->g->client, file, "pick_at_random");
 412     else
 413       disorder_set(ds->g->client, file, "pick_at_random", "0");
 414     if((value = numbered_arg("tags", numfile)))
 415       disorder_set(ds->g->client, file, "tags", value);
 416   } else if((name = cgi_get("name"))) {
 417     /* Raw preferences.  Not well supported in the templates at the moment. */
 418     value = cgi_get("value");
 419     if(value)
 420       disorder_set(ds->g->client, file, name, value);
 421     else
 422       disorder_unset(ds->g->client, file, name);
 423   }
 424 }
 425
 426 static void act_prefs(cgi_sink *output, dcgi_state *ds) {
 427   const char *files;
 428   int nfiles, numfile;
 429
 430   if((files = cgi_get("files"))) nfiles = atoi(files);
 431   else nfiles = 1;
 432   for(numfile = 0; numfile < nfiles; ++numfile)
 433     process_prefs(ds, numfile);
 434   cgi_header(output->sink, "Content-Type", "text/html");
 435   header_cookie(output->sink);
 436   cgi_body(output->sink);
 437   expand(output, "prefs", ds);
 438 }
 439
 440 static void act_pause(cgi_sink *output,
 441                       dcgi_state *ds) {
 442   if(ds->g->client)
 443     disorder_pause(ds->g->client);
 444   redirect(output->sink);
 445 }
 446
 447 static void act_resume(cgi_sink *output,
 448                        dcgi_state *ds) {
 449   if(ds->g->client)
 450     disorder_resume(ds->g->client);
 451   redirect(output->sink);
 452 }
 453
 454 static void act_login(cgi_sink *output,
 455                       dcgi_state *ds) {
 456   const char *username, *password, *back;
 457   disorder_client *c;
 458
 459   username = cgi_get("username");
 460   password = cgi_get("password");
 461   if(!username || !password
 462      || !strcmp(username, "guest")/*bodge to avoid guest cookies*/) {
 463     /* We're just visiting the login page */
 464     expand_template(ds, output, "login");
 465     return;
 466   }
 467   /* We'll need a new connection as we are going to stop being guest */
 468   c = disorder_new(0);
 469   if(disorder_connect_user(c, username, password)) {
 470     cgi_set_option("error", "loginfailed");
 471     expand_template(ds, output, "login");
 472     return;
 473   }
 474   if(disorder_make_cookie(c, &login_cookie)) {
 475     cgi_set_option("error", "cookiefailed");
 476     expand_template(ds, output, "login");
 477     return;
 478   }
 479   /* Use the new connection henceforth */
 480   ds->g->client = c;
 481   ds->g->flags = 0;
 482   /* We have a new cookie */
 483   header_cookie(output->sink);
 484   cgi_set_option("status", "loginok");
 485   if((back = cgi_get("back")) && *back)
 486     /* Redirect back to somewhere or other */
 487     redirect(output->sink);
 488   else
 489     /* Stick to the login page */
 490     expand_template(ds, output, "login");
 491 }
 492
 493 static void act_logout(cgi_sink *output,
 494                        dcgi_state *ds) {
 495   disorder_revoke(ds->g->client);
 496   login_cookie = 0;
 497   /* Reconnect as guest */
 498   disorder_cgi_login(ds, output);
 499   /* Back to the login page */
 500   cgi_set_option("status", "logoutok");
 501   expand_template(ds, output, "login");
 502 }
 503
 504 static void act_register(cgi_sink *output,
 505                          dcgi_state *ds) {
 506   const char *username, *password, *password2, *email;
 507   char *confirm, *content_type;
 508   const char *text, *encoding, *charset;
 509
 510   username = cgi_get("username");
 511   password = cgi_get("password1");
 512   password2 = cgi_get("password2");
 513   email = cgi_get("email");
 514
 515   if(!username || !*username) {
 516     cgi_set_option("error", "nousername");
 517     expand_template(ds, output, "login");
 518     return;
 519   }
 520   if(!password || !*password) {
 521     cgi_set_option("error", "nopassword");
 522     expand_template(ds, output, "login");
 523     return;
 524   }
 525   if(!password2 || !*password2 || strcmp(password, password2)) {
 526     cgi_set_option("error", "passwordmismatch");
 527     expand_template(ds, output, "login");
 528     return;
 529   }
 530   if(!email || !*email) {
 531     cgi_set_option("error", "noemail");
 532     expand_template(ds, output, "login");
 533     return;
 534   }
 535   /* We could well do better address validation but for now we'll just do the
 536    * minimum */
 537   if(!strchr(email, '@')) {
 538     cgi_set_option("error", "bademail");
 539     expand_template(ds, output, "login");
 540     return;
 541   }
 542   if(disorder_register(ds->g->client, username, password, email, &confirm)) {
 543     cgi_set_option("error", "cannotregister");
 544     expand_template(ds, output, "login");
 545     return;
 546   }
 547   /* Send the user a mail */
 548   /* TODO templatize this */
 549   byte_xasprintf((char **)&text,
 550                  "Welcome to DisOrder.  To active your login, please visit this URL:\n"
 551                  "\n"
 552                  "%s?c=%s\n", config->url, urlencodestring(confirm));
 553   if(!(text = mime_encode_text(text, &charset, &encoding)))
 554     fatal(0, "cannot encode email");
 555   byte_xasprintf(&content_type, "text/plain;charset=%s",
 556                  quote822(charset, 0));
 557   sendmail("", config->mail_sender, email, "Welcome to DisOrder",
 558            encoding, content_type, text); /* TODO error checking  */
 559   /* We'll go back to the login page with a suitable message */
 560   cgi_set_option("status", "registered");
 561   expand_template(ds, output, "login");
 562 }
 563
 564 static void act_confirm(cgi_sink *output,
 565                         dcgi_state *ds) {
 566   const char *confirmation;
 567
 568   if(!(confirmation = cgi_get("c"))) {
 569     cgi_set_option("error", "noconfirm");
 570     expand_template(ds, output, "login");
 571   }
 572   /* Confirm our registration */
 573   if(disorder_confirm(ds->g->client, confirmation)) {
 574     cgi_set_option("error", "badconfirm");
 575     expand_template(ds, output, "login");
 576   }
 577   /* Get a cookie */
 578   if(disorder_make_cookie(ds->g->client, &login_cookie)) {
 579     cgi_set_option("error", "cookiefailed");
 580     expand_template(ds, output, "login");
 581     return;
 582   }
 583   /* Discard any cached data JIC */
 584   ds->g->flags = 0;
 585   /* We have a new cookie */
 586   header_cookie(output->sink);
 587   cgi_set_option("status", "confirmed");
 588   expand_template(ds, output, "login");
 589 }
 590
 591 static void act_edituser(cgi_sink *output,
 592                          dcgi_state *ds) {
 593   const char *email = cgi_get("email"), *password = cgi_get("changepassword1");
 594   const char *password2 = cgi_get("changepassword2");
 595   int newpassword = 0;
 596   disorder_client *c;
 597
 598   if((password && *password) || (password && *password2)) {
 599     if(!password || !password2 || strcmp(password, password2)) {
 600       cgi_set_option("error", "passwordmismatch");
 601       expand_template(ds, output, "login");
 602       return;
 603     }
 604   } else
 605     password = password2 = 0;
 606
 607   if(email) {
 608     if(disorder_edituser(ds->g->client, disorder_user(ds->g->client),
 609                          "email", email)) {
 610       cgi_set_option("error", "badedit");
 611       expand_template(ds, output, "login");
 612       return;
 613     }
 614   }
 615   if(password) {
 616     if(disorder_edituser(ds->g->client, disorder_user(ds->g->client),
 617                          "password", password)) {
 618       cgi_set_option("error", "badedit");
 619       expand_template(ds, output, "login");
 620       return;
 621     }
 622     newpassword = 1;
 623   }
 624   if(newpassword) {
 625     login_cookie = 0;                   /* it'll be invalid now */
 626     /* This is a bit duplicative of act_login() */
 627     c = disorder_new(0);
 628     if(disorder_connect_user(c, disorder_user(ds->g->client), password)) {
 629       cgi_set_option("error", "loginfailed");
 630       expand_template(ds, output, "login");
 631       return;
 632     }
 633     if(disorder_make_cookie(c, &login_cookie)) {
 634       cgi_set_option("error", "cookiefailed");
 635       expand_template(ds, output, "login");
 636       return;
 637     }
 638     /* Use the new connection henceforth */
 639     ds->g->client = c;
 640     ds->g->flags = 0;
 641     /* We have a new cookie */
 642     header_cookie(output->sink);
 643   }
 644   cgi_set_option("status", "edited");
 645   expand_template(ds, output, "login");
 646 }
 647
 648 static const struct action {
 649   const char *name;
 650   void (*handler)(cgi_sink *output, dcgi_state *ds);
 651 } actions[] = {
 652   { "confirm", act_confirm },
 653   { "disable", act_disable },
 654   { "edituser", act_edituser },
 655   { "enable", act_enable },
 656   { "login", act_login },
 657   { "logout", act_logout },
 658   { "move", act_move },
 659   { "pause", act_pause },
 660   { "play", act_play },
 661   { "playing", act_playing },
 662   { "prefs", act_prefs },
 663   { "random-disable", act_random_disable },
 664   { "random-enable", act_random_enable },
 665   { "register", act_register },
 666   { "remove", act_remove },
 667   { "resume", act_resume },
 668   { "scratch", act_scratch },
 669   { "volume", act_volume },
 670 };
 671
 672 /* expansions *****************************************************************/
 673
 674 static void exp_include(int attribute((unused)) nargs,
 675                         char **args,
 676                         cgi_sink *output,
 677                         void *u) {
 678   expand(output, args[0], u);
 679 }
 680
 681 static void exp_server_version(int attribute((unused)) nargs,
 682                                char attribute((unused)) **args,
 683                                cgi_sink *output,
 684                                void *u) {
 685   dcgi_state *ds = u;
 686   const char *v;
 687
 688   if(ds->g->client) {
 689     if(disorder_version(ds->g->client, (char **)&v)) v = "(cannot get version)";
 690   } else
 691     v = "(server not running)";
 692   cgi_output(output, "%s", v);
 693 }
 694
 695 static void exp_version(int attribute((unused)) nargs,
 696                         char attribute((unused)) **args,
 697                         cgi_sink *output,
 698                         void attribute((unused)) *u) {
 699   cgi_output(output, "%s", disorder_short_version_string);
 700 }
 701
 702 static void exp_nonce(int attribute((unused)) nargs,
 703                       char attribute((unused)) **args,
 704                       cgi_sink *output,
 705                       void attribute((unused)) *u) {
 706   cgi_output(output, "%s", nonce());
 707 }
 708
 709 static void exp_label(int attribute((unused)) nargs,
 710                       char **args,
 711                       cgi_sink *output,
 712                       void attribute((unused)) *u) {
 713   cgi_output(output, "%s", cgi_label(args[0]));
 714 }
 715
 716 struct trackinfo_state {
 717   dcgi_state *ds;
 718   const struct queue_entry *q;
 719   long length;
 720   time_t when;
 721 };
 722
 723 static void exp_who(int attribute((unused)) nargs,
 724                     char attribute((unused)) **args,
 725                     cgi_sink *output,
 726                     void *u) {
 727   dcgi_state *ds = u;
 728
 729   if(ds->track && ds->track->submitter)
 730     cgi_output(output, "%s", ds->track->submitter);
 731 }
 732
 733 static void exp_length(int attribute((unused)) nargs,
 734                        char attribute((unused)) **args,
 735                        cgi_sink *output,
 736                        void *u) {
 737   dcgi_state *ds = u;
 738   long length = 0;
 739
 740   if(ds->track
 741      && (ds->track->state == playing_started
 742          || ds->track->state == playing_paused)
 743      && ds->track->sofar >= 0)
 744     cgi_output(output, "%ld:%02ld/",
 745                ds->track->sofar / 60, ds->track->sofar % 60);
 746   length = 0;
 747   if(ds->track)
 748     disorder_length(ds->g->client, ds->track->track, &length);
 749   else if(ds->tracks)
 750     disorder_length(ds->g->client, ds->tracks[0], &length);
 751   if(length)
 752     cgi_output(output, "%ld:%02ld", length / 60, length % 60);
 753   else
 754     sink_printf(output->sink, "%s", "&nbsp;");
 755 }
 756
 757 static void exp_when(int attribute((unused)) nargs,
 758                      char attribute((unused)) **args,
 759                      cgi_sink *output,
 760                      void *u) {
 761   dcgi_state *ds = u;
 762   const struct tm *w = 0;
 763
 764   if(ds->track)
 765     switch(ds->track->state) {
 766     case playing_isscratch:
 767     case playing_unplayed:
 768     case playing_random:
 769       if(ds->track->expected)
 770         w = localtime(&ds->track->expected);
 771       break;
 772     case playing_failed:
 773     case playing_no_player:
 774     case playing_ok:
 775     case playing_scratched:
 776     case playing_started:
 777     case playing_paused:
 778     case playing_quitting:
 779       if(ds->track->played)
 780         w = localtime(&ds->track->played);
 781       break;
 782     }
 783   if(w)
 784     cgi_output(output, "%d:%02d", w->tm_hour, w->tm_min);
 785   else
 786     sink_printf(output->sink, "&nbsp;");
 787 }
 788
 789 static void exp_part(int nargs,
 790                      char **args,
 791                      cgi_sink *output,
 792                      void *u) {
 793   dcgi_state *ds = u;
 794   const char *s, *track, *part, *context;
 795
 796   if(nargs == 3)
 797     track = args[2];
 798   else {
 799     if(ds->track)
 800       track = ds->track->track;
 801     else if(ds->tracks)
 802       track = ds->tracks[0];
 803     else
 804       track = 0;
 805   }
 806   if(track) {
 807     switch(nargs) {
 808     case 1:
 809       context = "display";
 810       part = args[0];
 811       break;
 812     case 2:
 813     case 3:
 814       context = args[0];
 815       part = args[1];
 816       break;
 817     default:
 818       abort();
 819     }
 820     if(disorder_part(ds->g->client, (char **)&s, track,
 821                      !strcmp(context, "short") ? "display" : context, part))
 822       fatal(0, "disorder_part() failed");
 823     if(!strcmp(context, "short"))
 824       s = truncate_for_display(s, config->short_display);
 825     cgi_output(output, "%s", s);
 826   } else
 827     sink_printf(output->sink, "&nbsp;");
 828 }
 829
 830 static void exp_playing(int attribute((unused)) nargs,
 831                         char **args,
 832                         cgi_sink *output,
 833                         void  *u) {
 834   dcgi_state *ds = u;
 835   dcgi_state s;
 836
 837   lookups(ds, DC_PLAYING);
 838   memset(&s, 0, sizeof s);
 839   s.g = ds->g;
 840   if(ds->g->playing) {
 841     s.track = ds->g->playing;
 842     expandstring(output, args[0], &s);
 843   }
 844 }
 845
 846 static void exp_queue(int attribute((unused)) nargs,
 847                       char **args,
 848                       cgi_sink *output,
 849                       void  *u) {
 850   dcgi_state *ds = u;
 851   dcgi_state s;
 852   struct queue_entry *q;
 853
 854   lookups(ds, DC_QUEUE);
 855   memset(&s, 0, sizeof s);
 856   s.g = ds->g;
 857   s.first = 1;
 858   for(q = ds->g->queue; q; q = q->next) {
 859     s.last = !q->next;
 860     s.track = q;
 861     expandstring(output, args[0], &s);
 862     s.index++;
 863     s.first = 0;
 864   }
 865 }
 866
 867 static void exp_recent(int attribute((unused)) nargs,
 868                        char **args,
 869                        cgi_sink *output,
 870                        void  *u) {
 871   dcgi_state *ds = u;
 872   dcgi_state s;
 873   struct queue_entry *q;
 874
 875   lookups(ds, DC_RECENT);
 876   memset(&s, 0, sizeof s);
 877   s.g = ds->g;
 878   s.first = 1;
 879   for(q = ds->g->recent; q; q = q->next) {
 880     s.last = !q;
 881     s.track = q;
 882     expandstring(output, args[0], &s);
 883     s.index++;
 884     s.first = 0;
 885   }
 886 }
 887
 888 static void exp_new(int attribute((unused)) nargs,
 889                     char **args,
 890                     cgi_sink *output,
 891                     void  *u) {
 892   dcgi_state *ds = u;
 893   dcgi_state s;
 894
 895   lookups(ds, DC_NEW);
 896   memset(&s, 0, sizeof s);
 897   s.g = ds->g;
 898   s.first = 1;
 899   for(s.index = 0; s.index < ds->g->nnew; ++s.index) {
 900     s.last = s.index + 1 < ds->g->nnew;
 901     s.tracks = &ds->g->new[s.index];
 902     expandstring(output, args[0], &s);
 903     s.first = 0;
 904   }
 905 }
 906
 907 static void exp_url(int attribute((unused)) nargs,
 908                     char attribute((unused)) **args,
 909                     cgi_sink *output,
 910                     void attribute((unused)) *u) {
 911   cgi_output(output, "%s", config->url);
 912 }
 913
 914 struct result {
 915   char *track;
 916   const char *sort;
 917 };
 918
 919 static int compare_result(const void *a, const void *b) {
 920   const struct result *ra = a, *rb = b;
 921   int c;
 922
 923   if(!(c = strcmp(ra->sort, rb->sort)))
 924     c = strcmp(ra->track, rb->track);
 925   return c;
 926 }
 927
 928 static void exp_search(int nargs,
 929                        char **args,
 930                        cgi_sink *output,
 931                        void *u) {
 932   dcgi_state *ds = u, substate;
 933   char **tracks;
 934   const char *q, *context, *part, *template;
 935   int ntracks, n, m;
 936   struct result *r;
 937
 938   switch(nargs) {
 939   case 2:
 940     part = args[0];
 941     context = "sort";
 942     template = args[1];
 943     break;
 944   case 3:
 945     part = args[0];
 946     context = args[1];
 947     template = args[2];
 948     break;
 949   default:
 950     assert(!"should never happen");
 951     part = context = template = 0;      /* quieten compiler */
 952   }
 953   if(ds->tracks == 0) {
 954     /* we are the top level, let's get some search results */
 955     if(!(q = cgi_get("query"))) return; /* no results yet */
 956     if(disorder_search(ds->g->client, q, &tracks, &ntracks)) return;
 957     if(!ntracks) return;
 958   } else {
 959     tracks = ds->tracks;
 960     ntracks = ds->ntracks;
 961   }
 962   assert(ntracks != 0);
 963   /* sort tracks by the appropriate part */
 964   r = xmalloc(ntracks * sizeof *r);
 965   for(n = 0; n < ntracks; ++n) {
 966     r[n].track = tracks[n];
 967     if(disorder_part(ds->g->client, (char **)&r[n].sort,
 968                      tracks[n], context, part))
 969       fatal(0, "disorder_part() failed");
 970   }
 971   qsort(r, ntracks, sizeof (struct result), compare_result);
 972   /* expand the 2nd arg once for each group.  We re-use the passed-in tracks
 973    * array as we know it's guaranteed to be big enough and isn't going to be
 974    * used for anything else any more. */
 975   memset(&substate, 0, sizeof substate);
 976   substate.g = ds->g;
 977   substate.first = 1;
 978   n = 0;
 979   while(n < ntracks) {
 980     substate.tracks = tracks;
 981     substate.ntracks = 0;
 982     m = n;
 983     while(m < ntracks
 984           && !strcmp(r[m].sort, r[n].sort))
 985       tracks[substate.ntracks++] = r[m++].track;
 986     substate.last = (m == ntracks);
 987     expandstring(output, template, &substate);
 988     substate.index++;
 989     substate.first = 0;
 990     n = m;
 991   }
 992   assert(substate.last != 0);
 993 }
 994
 995 static void exp_arg(int attribute((unused)) nargs,
 996                     char **args,
 997                     cgi_sink *output,
 998                     void attribute((unused)) *u) {
 999   const char *v;
1000
1001   if((v = cgi_get(args[0])))
1002     cgi_output(output, "%s", v);
1003 }
1004
1005 static void exp_stats(int attribute((unused)) nargs,
1006                       char attribute((unused)) **args,
1007                       cgi_sink *output,
1008                       void *u) {
1009   dcgi_state *ds = u;
1010   char **v;
1011
1012   cgi_opentag(output->sink, "pre", "class", "stats", (char *)0);
1013   if(!disorder_stats(ds->g->client, &v, 0)) {
1014     while(*v)
1015       cgi_output(output, "%s\n", *v++);
1016   }
1017   cgi_closetag(output->sink, "pre");
1018 }
1019
1020 static void exp_volume(int attribute((unused)) nargs,
1021                        char **args,
1022                        cgi_sink *output,
1023                        void *u) {
1024   dcgi_state *ds = u;
1025
1026   lookups(ds, DC_VOLUME);
1027   if(!strcmp(args[0], "left"))
1028     cgi_output(output, "%d", ds->g->volume_left);
1029   else
1030     cgi_output(output, "%d", ds->g->volume_right);
1031 }
1032
1033 static void exp_shell(int attribute((unused)) nargs,
1034                       char **args,
1035                       cgi_sink *output,
1036                       void attribute((unused)) *u) {
1037   int w, p[2], n;
1038   char buffer[4096];
1039   pid_t pid;
1040
1041   xpipe(p);
1042   if(!(pid = xfork())) {
1043     exitfn = _exit;
1044     xclose(p[0]);
1045     xdup2(p[1], 1);
1046     xclose(p[1]);
1047     execlp("sh", "sh", "-c", args[0], (char *)0);
1048     fatal(errno, "error executing sh");
1049   }
1050   xclose(p[1]);
1051   while((n = read(p[0], buffer, sizeof buffer))) {
1052     if(n < 0) {
1053       if(errno == EINTR) continue;
1054       else fatal(errno, "error reading from pipe");
1055     }
1056     output->sink->write(output->sink, buffer, n);
1057   }
1058   xclose(p[0]);
1059   while((n = waitpid(pid, &w, 0)) < 0 && errno == EINTR)
1060     ;
1061   if(n < 0) fatal(errno, "error calling waitpid");
1062   if(w)
1063     error(0, "shell command '%s' %s", args[0], wstat(w));
1064 }
1065
1066 static inline int str2bool(const char *s) {
1067   return !strcmp(s, "true");
1068 }
1069
1070 static inline const char *bool2str(int n) {
1071   return n ? "true" : "false";
1072 }
1073
1074 static char *expandarg(const char *arg, dcgi_state *ds) {
1075   struct dynstr d;
1076   cgi_sink output;
1077
1078   dynstr_init(&d);
1079   output.quote = 0;
1080   output.sink = sink_dynstr(&d);
1081   expandstring(&output, arg, ds);
1082   dynstr_terminate(&d);
1083   return d.vec;
1084 }
1085
1086 static void exp_prefs(int attribute((unused)) nargs,
1087                       char **args,
1088                       cgi_sink *output,
1089                       void *u) {
1090   dcgi_state *ds = u;
1091   dcgi_state substate;
1092   struct kvp *k;
1093   const char *file = expandarg(args[0], ds);
1094
1095   memset(&substate, 0, sizeof substate);
1096   substate.g = ds->g;
1097   substate.first = 1;
1098   if(disorder_prefs(ds->g->client, file, &k)) return;
1099   while(k) {
1100     substate.last = !k->next;
1101     substate.pref = k;
1102     expandstring(output, args[1], &substate);
1103     ++substate.index;
1104     k = k->next;
1105     substate.first = 0;
1106   }
1107 }
1108
1109 static void exp_pref(int attribute((unused)) nargs,
1110                      char **args,
1111                      cgi_sink *output,
1112                      void *u) {
1113   char *value;
1114   dcgi_state *ds = u;
1115
1116   if(!disorder_get(ds->g->client, args[0], args[1], &value))
1117     cgi_output(output, "%s", value);
1118 }
1119
1120 static void exp_if(int nargs,
1121                    char **args,
1122                    cgi_sink *output,
1123                    void *u) {
1124   dcgi_state *ds = u;
1125   int n = str2bool(expandarg(args[0], ds)) ? 1 : 2;
1126
1127   if(n < nargs)
1128     expandstring(output, args[n], ds);
1129 }
1130
1131 static void exp_and(int nargs,
1132                     char **args,
1133                     cgi_sink *output,
1134                     void *u) {
1135   dcgi_state *ds = u;
1136   int n, result = 1;
1137
1138   for(n = 0; n < nargs; ++n)
1139     if(!str2bool(expandarg(args[n], ds))) {
1140       result = 0;
1141       break;
1142     }
1143   sink_printf(output->sink, "%s", bool2str(result));
1144 }
1145
1146 static void exp_or(int nargs,
1147                    char **args,
1148                    cgi_sink *output,
1149                    void *u) {
1150   dcgi_state *ds = u;
1151   int n, result = 0;
1152
1153   for(n = 0; n < nargs; ++n)
1154     if(str2bool(expandarg(args[n], ds))) {
1155       result = 1;
1156       break;
1157     }
1158   sink_printf(output->sink, "%s", bool2str(result));
1159 }
1160
1161 static void exp_not(int attribute((unused)) nargs,
1162                     char **args,
1163                     cgi_sink *output,
1164                     void attribute((unused)) *u) {
1165   sink_printf(output->sink, "%s", bool2str(!str2bool(args[0])));
1166 }
1167
1168 static void exp_isplaying(int attribute((unused)) nargs,
1169                           char attribute((unused)) **args,
1170                           cgi_sink *output,
1171                           void *u) {
1172   dcgi_state *ds = u;
1173
1174   lookups(ds, DC_PLAYING);
1175   sink_printf(output->sink, "%s", bool2str(!!ds->g->playing));
1176 }
1177
1178 static void exp_isqueue(int attribute((unused)) nargs,
1179                         char attribute((unused)) **args,
1180                         cgi_sink *output,
1181                         void *u) {
1182   dcgi_state *ds = u;
1183
1184   lookups(ds, DC_QUEUE);
1185   sink_printf(output->sink, "%s", bool2str(!!ds->g->queue));
1186 }
1187
1188 static void exp_isrecent(int attribute((unused)) nargs,
1189                          char attribute((unused)) **args,
1190                          cgi_sink *output,
1191                          void *u) {
1192   dcgi_state *ds = u;
1193
1194   lookups(ds, DC_RECENT);
1195   sink_printf(output->sink, "%s", bool2str(!!ds->g->recent));
1196 }
1197
1198 static void exp_isnew(int attribute((unused)) nargs,
1199                       char attribute((unused)) **args,
1200                       cgi_sink *output,
1201                       void *u) {
1202   dcgi_state *ds = u;
1203
1204   lookups(ds, DC_NEW);
1205   sink_printf(output->sink, "%s", bool2str(!!ds->g->nnew));
1206 }
1207
1208 static void exp_id(int attribute((unused)) nargs,
1209                    char attribute((unused)) **args,
1210                    cgi_sink *output,
1211                    void *u) {
1212   dcgi_state *ds = u;
1213
1214   if(ds->track)
1215     cgi_output(output, "%s", ds->track->id);
1216 }
1217
1218 static void exp_track(int attribute((unused)) nargs,
1219                       char attribute((unused)) **args,
1220                       cgi_sink *output,
1221                       void *u) {
1222   dcgi_state *ds = u;
1223
1224   if(ds->track)
1225     cgi_output(output, "%s", ds->track->track);
1226 }
1227
1228 static void exp_parity(int attribute((unused)) nargs,
1229                        char attribute((unused)) **args,
1230                        cgi_sink *output,
1231                        void *u) {
1232   dcgi_state *ds = u;
1233
1234   cgi_output(output, "%s", ds->index % 2 ? "odd" : "even");
1235 }
1236
1237 static void exp_comment(int attribute((unused)) nargs,
1238                         char attribute((unused)) **args,
1239                         cgi_sink attribute((unused)) *output,
1240                         void attribute((unused)) *u) {
1241   /* do nothing */
1242 }
1243
1244 static void exp_prefname(int attribute((unused)) nargs,
1245                          char attribute((unused)) **args,
1246                          cgi_sink *output,
1247                          void *u) {
1248   dcgi_state *ds = u;
1249
1250   if(ds->pref && ds->pref->name)
1251     cgi_output(output, "%s", ds->pref->name);
1252 }
1253
1254 static void exp_prefvalue(int attribute((unused)) nargs,
1255                           char attribute((unused)) **args,
1256                           cgi_sink *output,
1257                           void *u) {
1258   dcgi_state *ds = u;
1259
1260   if(ds->pref && ds->pref->value)
1261     cgi_output(output, "%s", ds->pref->value);
1262 }
1263
1264 static void exp_isfiles(int attribute((unused)) nargs,
1265                         char attribute((unused)) **args,
1266                         cgi_sink *output,
1267                         void *u) {
1268   dcgi_state *ds = u;
1269
1270   lookups(ds, DC_FILES);
1271   sink_printf(output->sink, "%s", bool2str(!!ds->g->nfiles));
1272 }
1273
1274 static void exp_isdirectories(int attribute((unused)) nargs,
1275                               char attribute((unused)) **args,
1276                               cgi_sink *output,
1277                               void *u) {
1278   dcgi_state *ds = u;
1279
1280   lookups(ds, DC_DIRS);
1281   sink_printf(output->sink, "%s", bool2str(!!ds->g->ndirs));
1282 }
1283
1284 static void exp_choose(int attribute((unused)) nargs,
1285                        char **args,
1286                        cgi_sink *output,
1287                        void *u) {
1288   dcgi_state *ds = u;
1289   dcgi_state substate;
1290   int nfiles, n;
1291   char **files;
1292   struct entry *e;
1293   const char *type, *what = expandarg(args[0], ds);
1294
1295   if(!strcmp(what, "files")) {
1296     lookups(ds, DC_FILES);
1297     files = ds->g->files;
1298     nfiles = ds->g->nfiles;
1299     type = "track";
1300   } else if(!strcmp(what, "directories")) {
1301     lookups(ds, DC_DIRS);
1302     files = ds->g->dirs;
1303     nfiles = ds->g->ndirs;
1304     type = "dir";
1305   } else {
1306     error(0, "unknown @choose@ argument '%s'", what);
1307     return;
1308   }
1309   e = xmalloc(nfiles * sizeof (struct entry));
1310   for(n = 0; n < nfiles; ++n) {
1311     e[n].path = files[n];
1312     e[n].sort = trackname_transform(type, files[n], "sort");
1313     e[n].display = trackname_transform(type, files[n], "display");
1314   }
1315   qsort(e, nfiles, sizeof (struct entry), compare_entry);
1316   memset(&substate, 0, sizeof substate);
1317   substate.g = ds->g;
1318   substate.first = 1;
1319   for(n = 0; n < nfiles; ++n) {
1320     substate.last = (n == nfiles - 1);
1321     substate.index = n;
1322     substate.entry = &e[n];
1323     expandstring(output, args[1], &substate);
1324     substate.first = 0;
1325   }
1326 }
1327
1328 static void exp_file(int attribute((unused)) nargs,
1329                      char attribute((unused)) **args,
1330                      cgi_sink *output,
1331                      void *u) {
1332   dcgi_state *ds = u;
1333
1334   if(ds->entry)
1335     cgi_output(output, "%s", ds->entry->path);
1336   else if(ds->track)
1337     cgi_output(output, "%s", ds->track->track);
1338   else if(ds->tracks)
1339     cgi_output(output, "%s", ds->tracks[0]);
1340 }
1341
1342 static void exp_transform(int nargs,
1343                           char **args,
1344                           cgi_sink *output,
1345                           void attribute((unused)) *u) {
1346   const char *context = nargs > 2 ? args[2] : "display";
1347
1348   cgi_output(output, "%s", trackname_transform(args[1], args[0], context));
1349 }
1350
1351 static void exp_urlquote(int attribute((unused)) nargs,
1352                          char **args,
1353                          cgi_sink *output,
1354                          void attribute((unused)) *u) {
1355   cgi_output(output, "%s", urlencodestring(args[0]));
1356 }
1357
1358 static void exp_scratchable(int attribute((unused)) nargs,
1359                             char attribute((unused)) **args,
1360                             cgi_sink *output,
1361                             void attribute((unused)) *u) {
1362   dcgi_state *ds = u;
1363
1364   lookups(ds, DC_PLAYING|DC_RIGHTS);
1365   sink_printf(output->sink, "%s",
1366               bool2str(right_scratchable(ds->g->rights,
1367                                          disorder_user(ds->g->client),
1368                                          ds->g->playing)));
1369 }
1370
1371 static void exp_removable(int attribute((unused)) nargs,
1372                           char attribute((unused)) **args,
1373                           cgi_sink *output,
1374                           void attribute((unused)) *u) {
1375   dcgi_state *ds = u;
1376
1377   lookups(ds, DC_RIGHTS);
1378   sink_printf(output->sink, "%s",
1379               bool2str(right_removable(ds->g->rights,
1380                                        disorder_user(ds->g->client),
1381                                        ds->track)));
1382 }
1383
1384 static void exp_movable(int attribute((unused)) nargs,
1385                         char attribute((unused)) **args,
1386                         cgi_sink *output,
1387                         void attribute((unused)) *u) {
1388   dcgi_state *ds = u;
1389
1390   lookups(ds, DC_RIGHTS);
1391   sink_printf(output->sink, "%s",
1392               bool2str(right_movable(ds->g->rights,
1393                                      disorder_user(ds->g->client),
1394                                      ds->track)));
1395 }
1396
1397 static void exp_navigate(int attribute((unused)) nargs,
1398                          char **args,
1399                          cgi_sink *output,
1400                          void *u) {
1401   dcgi_state *ds = u;
1402   dcgi_state substate;
1403   const char *path = expandarg(args[0], ds);
1404   const char *ptr;
1405   int dirlen;
1406
1407   if(*path) {
1408     memset(&substate, 0, sizeof substate);
1409     substate.g = ds->g;
1410     ptr = path + 1;                     /* skip root */
1411     dirlen = 0;
1412     substate.nav_path = path;
1413     substate.first = 1;
1414     while(*ptr) {
1415       while(*ptr && *ptr != '/')
1416         ++ptr;
1417       substate.last = !*ptr;
1418       substate.nav_len = ptr - path;
1419       substate.nav_dirlen = dirlen;
1420       expandstring(output, args[1], &substate);
1421       dirlen = substate.nav_len;
1422       if(*ptr) ++ptr;
1423       substate.first = 0;
1424     }
1425   }
1426 }
1427
1428 static void exp_fullname(int attribute((unused)) nargs,
1429                          char attribute((unused)) **args,
1430                          cgi_sink *output,
1431                          void *u) {
1432   dcgi_state *ds = u;
1433   cgi_output(output, "%.*s", ds->nav_len, ds->nav_path);
1434 }
1435
1436 static void exp_basename(int nargs,
1437                          char **args,
1438                          cgi_sink *output,
1439                          void *u) {
1440   dcgi_state *ds = u;
1441   const char *s;
1442
1443   if(nargs) {
1444     if((s = strrchr(args[0], '/'))) ++s;
1445     else s = args[0];
1446     cgi_output(output, "%s", s);
1447   } else
1448     cgi_output(output, "%.*s", ds->nav_len - ds->nav_dirlen - 1,
1449                ds->nav_path + ds->nav_dirlen + 1);
1450 }
1451
1452 static void exp_dirname(int nargs,
1453                         char **args,
1454                         cgi_sink *output,
1455                         void *u) {
1456   dcgi_state *ds = u;
1457   const char *s;
1458
1459   if(nargs) {
1460     if((s = strrchr(args[0], '/')))
1461       cgi_output(output, "%.*s", (int)(s - args[0]), args[0]);
1462   } else
1463     cgi_output(output, "%.*s", ds->nav_dirlen, ds->nav_path);
1464 }
1465
1466 static void exp_eq(int attribute((unused)) nargs,
1467                    char **args,
1468                    cgi_sink *output,
1469                    void attribute((unused)) *u) {
1470   cgi_output(output, "%s", bool2str(!strcmp(args[0], args[1])));
1471 }
1472
1473 static void exp_ne(int attribute((unused)) nargs,
1474                    char **args,
1475                    cgi_sink *output,
1476                    void attribute((unused)) *u) {
1477   cgi_output(output, "%s", bool2str(strcmp(args[0], args[1])));
1478 }
1479
1480 static void exp_enabled(int attribute((unused)) nargs,
1481                                char attribute((unused)) **args,
1482                                cgi_sink *output,
1483                                void *u) {
1484   dcgi_state *ds = u;
1485   int enabled = 0;
1486
1487   if(ds->g->client)
1488     disorder_enabled(ds->g->client, &enabled);
1489   cgi_output(output, "%s", bool2str(enabled));
1490 }
1491
1492 static void exp_random_enabled(int attribute((unused)) nargs,
1493                                char attribute((unused)) **args,
1494                                cgi_sink *output,
1495                                void *u) {
1496   dcgi_state *ds = u;
1497   int enabled = 0;
1498
1499   if(ds->g->client)
1500     disorder_random_enabled(ds->g->client, &enabled);
1501   cgi_output(output, "%s", bool2str(enabled));
1502 }
1503
1504 static void exp_trackstate(int attribute((unused)) nargs,
1505                            char **args,
1506                            cgi_sink *output,
1507                            void *u) {
1508   dcgi_state *ds = u;
1509   struct queue_entry *q;
1510   char *track;
1511
1512   if(disorder_resolve(ds->g->client, &track, args[0])) return;
1513   lookups(ds, DC_QUEUE|DC_PLAYING);
1514   if(ds->g->playing && !strcmp(ds->g->playing->track, track))
1515     cgi_output(output, "playing");
1516   else {
1517     for(q = ds->g->queue; q && strcmp(q->track, track); q = q->next)
1518       ;
1519     if(q)
1520       cgi_output(output, "queued");
1521   }
1522 }
1523
1524 static void exp_thisurl(int attribute((unused)) nargs,
1525                         char attribute((unused)) **args,
1526                         cgi_sink *output,
1527                         void attribute((unused)) *u) {
1528   kvp_set(&cgi_args, "nonce", nonce()); /* nonces had better differ! */
1529   cgi_output(output, "%s?%s", config->url, kvp_urlencode(cgi_args, 0));
1530 }
1531
1532 static void exp_isfirst(int attribute((unused)) nargs,
1533                         char attribute((unused)) **args,
1534                         cgi_sink *output,
1535                         void *u) {
1536   dcgi_state *ds = u;
1537
1538   sink_printf(output->sink, "%s", bool2str(!!ds->first));
1539 }
1540
1541 static void exp_islast(int attribute((unused)) nargs,
1542                         char attribute((unused)) **args,
1543                         cgi_sink *output,
1544                         void *u) {
1545   dcgi_state *ds = u;
1546
1547   sink_printf(output->sink, "%s", bool2str(!!ds->last));
1548 }
1549
1550 static void exp_action(int attribute((unused)) nargs,
1551                        char attribute((unused)) **args,
1552                        cgi_sink *output,
1553                        void attribute((unused)) *u) {
1554   const char *action = cgi_get("action"), *mgmt;
1555
1556   if(!action) action = "playing";
1557   if(!strcmp(action, "playing")
1558      && (mgmt = cgi_get("mgmt"))
1559      && !strcmp(mgmt, "true"))
1560     action = "manage";
1561   sink_printf(output->sink, "%s", action);
1562 }
1563
1564 static void exp_resolve(int attribute((unused)) nargs,
1565                       char  **args,
1566                       cgi_sink *output,
1567                       void attribute((unused)) *u) {
1568   dcgi_state *ds = u;
1569   char *track;
1570
1571   if(!disorder_resolve(ds->g->client, &track, args[0]))
1572     sink_printf(output->sink, "%s", track);
1573 }
1574
1575 static void exp_paused(int attribute((unused)) nargs,
1576                        char attribute((unused)) **args,
1577                        cgi_sink *output,
1578                        void *u) {
1579   dcgi_state *ds = u;
1580   int paused = 0;
1581
1582   lookups(ds, DC_PLAYING);
1583   if(ds->g->playing && ds->g->playing->state == playing_paused)
1584     paused = 1;
1585   cgi_output(output, "%s", bool2str(paused));
1586 }
1587
1588 static void exp_state(int attribute((unused)) nargs,
1589                       char attribute((unused)) **args,
1590                       cgi_sink *output,
1591                       void *u) {
1592   dcgi_state *ds = u;
1593
1594   if(ds->track)
1595     cgi_output(output, "%s", playing_states[ds->track->state]);
1596 }
1597
1598 static void exp_files(int attribute((unused)) nargs,
1599                       char **args,
1600                       cgi_sink *output,
1601                       void *u) {
1602   dcgi_state *ds = u;
1603   dcgi_state substate;
1604   const char *nfiles_arg, *directory;
1605   int nfiles, numfile;
1606   struct kvp *k;
1607
1608   memset(&substate, 0, sizeof substate);
1609   substate.g = ds->g;
1610   if((directory = cgi_get("directory"))) {
1611     /* Prefs for whole directory. */
1612     lookups(ds, DC_FILES);
1613     /* Synthesize args for the file list. */
1614     nfiles = ds->g->nfiles;
1615     for(numfile = 0; numfile < nfiles; ++numfile) {
1616       k = xmalloc(sizeof *k);
1617       byte_xasprintf((char **)&k->name, "%d_file", numfile);
1618       k->value = ds->g->files[numfile];
1619       k->next = cgi_args;
1620       cgi_args = k;
1621     }
1622   } else {
1623     /* Args already present. */
1624     if((nfiles_arg = cgi_get("files"))) nfiles = atoi(nfiles_arg);
1625     else nfiles = 1;
1626   }
1627   for(numfile = 0; numfile < nfiles; ++numfile) {
1628     substate.index = numfile;
1629     expandstring(output, args[0], &substate);
1630   }
1631 }
1632
1633 static void exp_index(int attribute((unused)) nargs,
1634                       char attribute((unused)) **args,
1635                       cgi_sink *output,
1636                       void *u) {
1637   dcgi_state *ds = u;
1638
1639   cgi_output(output, "%d", ds->index);
1640 }
1641
1642 static void exp_nfiles(int attribute((unused)) nargs,
1643                        char attribute((unused)) **args,
1644                        cgi_sink *output,
1645                        void *u) {
1646   dcgi_state *ds = u;
1647   const char *files_arg;
1648
1649   if(cgi_get("directory")) {
1650     lookups(ds, DC_FILES);
1651     cgi_output(output, "%d", ds->g->nfiles);
1652   } else if((files_arg = cgi_get("files")))
1653     cgi_output(output, "%s", files_arg);
1654   else
1655     cgi_output(output, "1");
1656 }
1657
1658 static void exp_user(int attribute((unused)) nargs,
1659                      char attribute((unused)) **args,
1660                      cgi_sink *output,
1661                      void *u) {
1662   dcgi_state *const ds = u;
1663
1664   cgi_output(output, "%s", disorder_user(ds->g->client));
1665 }
1666
1667 static void exp_right(int attribute((unused)) nargs,
1668                       char **args,
1669                       cgi_sink *output,
1670                       void *u) {
1671   dcgi_state *const ds = u;
1672   const char *right = expandarg(args[0], ds);
1673   rights_type r;
1674
1675   lookups(ds, DC_RIGHTS);
1676   if(parse_rights(right, &r, 1/*report*/))
1677     r = 0;
1678   if(args[1] == 0)
1679     cgi_output(output, "%s", bool2str(!!(r & ds->g->rights)));
1680   else if(r & ds->g->rights)
1681     expandstring(output, args[1], ds);
1682   else if(args[2])
1683     expandstring(output, args[2], ds);
1684 }
1685
1686 static void exp_userinfo(int attribute((unused)) nargs,
1687                          char **args,
1688                          cgi_sink *output,
1689                          void *u) {
1690   dcgi_state *const ds = u;
1691   const char *value;
1692
1693   if(disorder_userinfo(ds->g->client, disorder_user(ds->g->client), args[0],
1694                        (char **)&value))
1695     value = "";
1696   cgi_output(output, "%s", value);
1697 }
1698
1699 static const struct cgi_expansion expansions[] = {
1700   { "#", 0, INT_MAX, EXP_MAGIC, exp_comment },
1701   { "action", 0, 0, 0, exp_action },
1702   { "and", 0, INT_MAX, EXP_MAGIC, exp_and },
1703   { "arg", 1, 1, 0, exp_arg },
1704   { "basename", 0, 1, 0, exp_basename },
1705   { "choose", 2, 2, EXP_MAGIC, exp_choose },
1706   { "dirname", 0, 1, 0, exp_dirname },
1707   { "enabled", 0, 0, 0, exp_enabled },
1708   { "eq", 2, 2, 0, exp_eq },
1709   { "file", 0, 0, 0, exp_file },
1710   { "files", 1, 1, EXP_MAGIC, exp_files },
1711   { "fullname", 0, 0, 0, exp_fullname },
1712   { "id", 0, 0, 0, exp_id },
1713   { "if", 2, 3, EXP_MAGIC, exp_if },
1714   { "include", 1, 1, 0, exp_include },
1715   { "index", 0, 0, 0, exp_index },
1716   { "isdirectories", 0, 0, 0, exp_isdirectories },
1717   { "isfiles", 0, 0, 0, exp_isfiles },
1718   { "isfirst", 0, 0, 0, exp_isfirst },
1719   { "islast", 0, 0, 0, exp_islast },
1720   { "isnew", 0, 0, 0, exp_isnew },
1721   { "isplaying", 0, 0, 0, exp_isplaying },
1722   { "isqueue", 0, 0, 0, exp_isqueue },
1723   { "isrecent", 0, 0, 0, exp_isrecent },
1724   { "label", 1, 1, 0, exp_label },
1725   { "length", 0, 0, 0, exp_length },
1726   { "movable", 0, 0, 0, exp_movable },
1727   { "navigate", 2, 2, EXP_MAGIC, exp_navigate },
1728   { "ne", 2, 2, 0, exp_ne },
1729   { "new", 1, 1, EXP_MAGIC, exp_new },
1730   { "nfiles", 0, 0, 0, exp_nfiles },
1731   { "nonce", 0, 0, 0, exp_nonce },
1732   { "not", 1, 1, 0, exp_not },
1733   { "or", 0, INT_MAX, EXP_MAGIC, exp_or },
1734   { "parity", 0, 0, 0, exp_parity },
1735   { "part", 1, 3, 0, exp_part },
1736   { "paused", 0, 0, 0, exp_paused },
1737   { "playing", 1, 1, EXP_MAGIC, exp_playing },
1738   { "pref", 2, 2, 0, exp_pref },
1739   { "prefname", 0, 0, 0, exp_prefname },
1740   { "prefs", 2, 2, EXP_MAGIC, exp_prefs },
1741   { "prefvalue", 0, 0, 0, exp_prefvalue },
1742   { "queue", 1, 1, EXP_MAGIC, exp_queue },
1743   { "random-enabled", 0, 0, 0, exp_random_enabled },
1744   { "recent", 1, 1, EXP_MAGIC, exp_recent },
1745   { "removable", 0, 0, 0, exp_removable },
1746   { "resolve", 1, 1, 0, exp_resolve },
1747   { "right", 1, 3, EXP_MAGIC, exp_right },
1748   { "scratchable", 0, 0, 0, exp_scratchable },
1749   { "search", 2, 3, EXP_MAGIC, exp_search },
1750   { "server-version", 0, 0, 0, exp_server_version },
1751   { "shell", 1, 1, 0, exp_shell },
1752   { "state", 0, 0, 0, exp_state },
1753   { "stats", 0, 0, 0, exp_stats },
1754   { "thisurl", 0, 0, 0, exp_thisurl },
1755   { "track", 0, 0, 0, exp_track },
1756   { "trackstate", 1, 1, 0, exp_trackstate },
1757   { "transform", 2, 3, 0, exp_transform },
1758   { "url", 0, 0, 0, exp_url },
1759   { "urlquote", 1, 1, 0, exp_urlquote },
1760   { "user", 0, 0, 0, exp_user },
1761   { "userinfo", 1, 1, 0, exp_userinfo },
1762   { "version", 0, 0, 0, exp_version },
1763   { "volume", 1, 1, 0, exp_volume },
1764   { "when", 0, 0, 0, exp_when },
1765   { "who", 0, 0, 0, exp_who }
1766 };
1767
1768 static void expand(cgi_sink *output,
1769                    const char *template,
1770                    dcgi_state *ds) {
1771   cgi_expand(template,
1772              expansions, sizeof expansions / sizeof *expansions,
1773              output,
1774              ds);
1775 }
1776
1777 static void expandstring(cgi_sink *output,
1778                          const char *string,
1779                          dcgi_state *ds) {
1780   cgi_expand_string("",
1781                     string,
1782                     expansions, sizeof expansions / sizeof *expansions,
1783                     output,
1784                     ds);
1785 }
1786
1787 static void perform_action(cgi_sink *output, dcgi_state *ds,
1788                            const char *action) {
1789   int n;
1790
1791   /* We don't ever want anything to be cached */
1792   cgi_header(output->sink, "Cache-Control", "no-cache");
1793   if((n = TABLE_FIND(actions, struct action, name, action)) >= 0)
1794     actions[n].handler(output, ds);
1795   else
1796     expand_template(ds, output, action);
1797 }
1798
1799 void disorder_cgi(cgi_sink *output, dcgi_state *ds) {
1800   const char *action = cgi_get("action");
1801
1802   if(!action) {
1803     /* We allow URLs which are just confirm=... in order to keep confirmation
1804      * URLs, which are user-facing, as short as possible. */
1805     if(cgi_get("c"))
1806       action = "confirm";
1807     else
1808       action = "playing";
1809   }
1810   perform_action(output, ds, action);
1811 }
1812
1813 void disorder_cgi_error(cgi_sink *output, dcgi_state *ds,
1814                         const char *msg) {
1815   cgi_set_option("error", msg);
1816   perform_action(output, ds, "error");
1817 }
1818
1819 /** @brief Log in as the current user or guest if none */
1820 void disorder_cgi_login(dcgi_state *ds, cgi_sink *output) {
1821   /* Create a new connection */
1822   ds->g->client = disorder_new(0);
1823   /* Forget everything we knew */
1824   ds->g->flags = 0;
1825   /* Reconnect */
1826   if(disorder_connect_cookie(ds->g->client, login_cookie)) {
1827     disorder_cgi_error(output, ds, "connect");
1828     exit(0);
1829   }
1830   /* If there was a cookie but it went bad, we forget it */
1831   if(login_cookie && !strcmp(disorder_user(ds->g->client), "guest"))
1832     login_cookie = 0;
1833 }
1834
1835 /*
1836 Local Variables:
1837 c-basic-offset:2
1838 comment-column:40
1839 fill-column:79
1840 End:
1841 */