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

   1
   2 #include <stdio.h>
   3 #include <errno.h>
   4 #include <sys/types.h>
   5 #include <sys/socket.h>
   6 #include <stddef.h>
   7 #include <stdlib.h>
   8 #include <time.h>
   9 #include <unistd.h>
  10 #include <string.h>
  11 #include <sys/wait.h>
  12 #include <pcre.h>
  13 #include <assert.h>
  14
  15 #include "client.h"
  16 #include "mem.h"
  17 #include "vector.h"
  18 #include "sink.h"
  19 #include "server-cgi.h"
  20 #include "log.h"
  21 #include "configuration.h"
  22 #include "table.h"
  23 #include "queue.h"
  24 #include "plugin.h"
  25 #include "split.h"
  26 #include "wstat.h"
  27 #include "kvp.h"
  28 #include "syscalls.h"
  29 #include "printf.h"
  30 #include "regsub.h"
  31 #include "defs.h"
  32 #include "trackname.h"
  33 #include "charset.h"
  34 #include "dcgi.h"
  35 #include "url.h"
  36 #include "mime.h"
  37 #include "sendmail.h"
  38 #include "base64.h"
  39
  40 struct entry {
  41   const char *path;
  42   const char *sort;
  43   const char *display;
  44 };
  45
  46 static int compare_entry(const void *a, const void *b) {
  47   const struct entry *ea = a, *eb = b;
  48
  49   return compare_tracks(ea->sort, eb->sort,
  50                         ea->display, eb->display,
  51                         ea->path, eb->path);
  52 }
  53
  54 static const char *front_url(void) {
  55   char *url;
  56   const char *mgmt;
  57
  58   /* preserve management interface visibility */
  59   if((mgmt = cgi_get("mgmt")) && !strcmp(mgmt, "true")) {
  60     byte_xasprintf(&url, "%s?mgmt=true", config->url);
  61     return url;
  62   }
  63   return config->url;
  64 }
  65
  66 static void header_cookie(struct sink *output) {
  67   struct dynstr d[1];
  68   struct url u;
  69
  70   memset(&u, 0, sizeof u);
  71   dynstr_init(d);
  72   parse_url(config->url, &u);
  73   if(login_cookie) {
  74     dynstr_append_string(d, "disorder=");
  75     dynstr_append_string(d, login_cookie);
  76   } else {
  77     /* Force browser to discard cookie */
  78     dynstr_append_string(d, "disorder=none;Max-Age=0");
  79   }
  80   if(u.path) {
  81     /* The default domain matches the request host, so we need not override
  82      * that.  But the default path only goes up to the rightmost /, which would
  83      * cause the browser to expose the cookie to other CGI programs on the same
  84      * web server. */
  85     dynstr_append_string(d, ";Version=1;Path=");
  86     /* Formally we are supposed to quote the path, since it invariably has a
  87      * slash in it.  However Safari does not parse quoted paths correctly, so
  88      * this won't work.  Fortunately nothing else seems to care about proper
  89      * quoting of paths, so in practice we get with it.  (See also
  90      * parse_cookie() where we are liberal about cookie paths on the way back
  91      * in.) */
  92     dynstr_append_string(d, u.path);
  93   }
  94   dynstr_terminate(d);
  95   cgi_header(output, "Set-Cookie", d->vec);
  96 }
  97
  98 static void redirect(struct sink *output) {
  99   const char *back;
 100
 101   back = cgi_get("back");
 102   cgi_header(output, "Location", back && *back ? back : front_url());
 103   header_cookie(output);
 104   cgi_body(output);
 105 }
 106
 107 static void expand_template(dcgi_state *ds, cgi_sink *output,
 108                             const char *action) {
 109   cgi_header(output->sink, "Content-Type", "text/html");
 110   header_cookie(output->sink);
 111   cgi_body(output->sink);
 112   expand(output, action, ds);
 113 }
 114
 115 /* actions ********************************************************************/
 116
 117 static void act_disable(cgi_sink *output,
 118                         dcgi_state *ds) {
 119   if(ds->g->client)
 120     disorder_disable(ds->g->client);
 121   redirect(output->sink);
 122 }
 123
 124 static void act_enable(cgi_sink *output,
 125                               dcgi_state *ds) {
 126   if(ds->g->client)
 127     disorder_enable(ds->g->client);
 128   redirect(output->sink);
 129 }
 130
 131 static void act_random_disable(cgi_sink *output,
 132                                dcgi_state *ds) {
 133   if(ds->g->client)
 134     disorder_random_disable(ds->g->client);
 135   redirect(output->sink);
 136 }
 137
 138 static void act_random_enable(cgi_sink *output,
 139                               dcgi_state *ds) {
 140   if(ds->g->client)
 141     disorder_random_enable(ds->g->client);
 142   redirect(output->sink);
 143 }
 144
 145 static void act_remove(cgi_sink *output,
 146                        dcgi_state *ds) {
 147   const char *id;
 148
 149   if(!(id = cgi_get("id"))) fatal(0, "missing id argument");
 150   if(ds->g->client)
 151     disorder_remove(ds->g->client, id);
 152   redirect(output->sink);
 153 }
 154
 155 static void act_move(cgi_sink *output,
 156                      dcgi_state *ds) {
 157   const char *id, *delta;
 158
 159   if(!(id = cgi_get("id"))) fatal(0, "missing id argument");
 160   if(!(delta = cgi_get("delta"))) fatal(0, "missing delta argument");
 161   if(ds->g->client)
 162     disorder_move(ds->g->client, id, atoi(delta));
 163   redirect(output->sink);
 164 }
 165
 166 static void act_scratch(cgi_sink *output,
 167                         dcgi_state *ds) {
 168   if(ds->g->client)
 169     disorder_scratch(ds->g->client, cgi_get("id"));
 170   redirect(output->sink);
 171 }
 172
 173 static void act_playing(cgi_sink *output, dcgi_state *ds) {
 174   char r[1024];
 175   long refresh = config->refresh, length;
 176   time_t now, fin;
 177   int random_enabled = 0;
 178   int enabled = 0;
 179
 180   lookups(ds, DC_PLAYING|DC_QUEUE);
 181   cgi_header(output->sink, "Content-Type", "text/html");
 182   disorder_random_enabled(ds->g->client, &random_enabled);
 183   disorder_enabled(ds->g->client, &enabled);
 184   if(ds->g->playing
 185      && ds->g->playing->state == playing_started /* i.e. not paused */
 186      && !disorder_length(ds->g->client, ds->g->playing->track, &length)
 187      && length
 188      && ds->g->playing->sofar >= 0) {
 189     /* Try to put the next refresh at the start of the next track. */
 190     time(&now);
 191     fin = now + length - ds->g->playing->sofar + config->gap;
 192     if(now + refresh > fin)
 193       refresh = fin - now;
 194   }
 195   if(ds->g->queue && ds->g->queue->state == playing_isscratch) {
 196     /* next track is a scratch, don't leave more than the inter-track gap */
 197     if(refresh > config->gap)
 198       refresh = config->gap;
 199   }
 200   if(!ds->g->playing && ((ds->g->queue
 201                           && ds->g->queue->state != playing_random)
 202                          || random_enabled) && enabled) {
 203     /* no track playing but playing is enabled and there is something coming
 204      * up, must be in a gap */
 205     if(refresh > config->gap)
 206       refresh = config->gap;
 207   }
 208   byte_snprintf(r, sizeof r, "%ld;url=%s", refresh > 0 ? refresh : 1,
 209                 front_url());
 210   cgi_header(output->sink, "Refresh", r);
 211   header_cookie(output->sink);
 212   cgi_body(output->sink);
 213   expand(output, "playing", ds);
 214 }
 215
 216 static void act_play(cgi_sink *output,
 217                      dcgi_state *ds) {
 218   const char *track, *dir;
 219   char **tracks;
 220   int ntracks, n;
 221   struct entry *e;
 222
 223   if((track = cgi_get("file"))) {
 224     disorder_play(ds->g->client, track);
 225   } else if((dir = cgi_get("directory"))) {
 226     if(disorder_files(ds->g->client, dir, 0, &tracks, &ntracks)) ntracks = 0;
 227     if(ntracks) {
 228       e = xmalloc(ntracks * sizeof (struct entry));
 229       for(n = 0; n < ntracks; ++n) {
 230         e[n].path = tracks[n];
 231         e[n].sort = trackname_transform("track", tracks[n], "sort");
 232         e[n].display = trackname_transform("track", tracks[n], "display");
 233       }
 234       qsort(e, ntracks, sizeof (struct entry), compare_entry);
 235       for(n = 0; n < ntracks; ++n)
 236         disorder_play(ds->g->client, e[n].path);
 237     }
 238   }
 239   /* XXX error handling */
 240   redirect(output->sink);
 241 }
 242
 243 static int clamp(int n, int min, int max) {
 244   if(n < min)
 245     return min;
 246   if(n > max)
 247     return max;
 248   return n;
 249 }
 250
 251 static const char *volume_url(void) {
 252   char *url;
 253
 254   byte_xasprintf(&url, "%s?action=volume", config->url);
 255   return url;
 256 }
 257
 258 static void act_volume(cgi_sink *output, dcgi_state *ds) {
 259   const char *l, *r, *d, *back;
 260   int nd, changed = 0;;
 261
 262   if((d = cgi_get("delta"))) {
 263     lookups(ds, DC_VOLUME);
 264     nd = clamp(atoi(d), -255, 255);
 265     disorder_set_volume(ds->g->client,
 266                         clamp(ds->g->volume_left + nd, 0, 255),
 267                         clamp(ds->g->volume_right + nd, 0, 255));
 268     changed = 1;
 269   } else if((l = cgi_get("left")) && (r = cgi_get("right"))) {
 270     disorder_set_volume(ds->g->client, atoi(l), atoi(r));
 271     changed = 1;
 272   }
 273   if(changed) {
 274     /* redirect back to ourselves (but without the volume-changing bits in the
 275      * URL) */
 276     cgi_header(output->sink, "Location",
 277                (back = cgi_get("back")) ? back : volume_url());
 278     header_cookie(output->sink);
 279     cgi_body(output->sink);
 280   } else {
 281     cgi_header(output->sink, "Content-Type", "text/html");
 282     header_cookie(output->sink);
 283     cgi_body(output->sink);
 284     expand(output, "volume", ds);
 285   }
 286 }
 287
 288 static void act_prefs_errors(const char *msg,
 289                              void attribute((unused)) *u) {
 290   fatal(0, "error splitting parts list: %s", msg);
 291 }
 292
 293 static const char *numbered_arg(const char *argname, int numfile) {
 294   char *fullname;
 295
 296   byte_xasprintf(&fullname, "%d_%s", numfile, argname);
 297   return cgi_get(fullname);
 298 }
 299
 300 static void process_prefs(dcgi_state *ds, int numfile) {
 301   const char *file, *name, *value, *part, *parts, *current, *context;
 302   char **partslist;
 303
 304   if(!(file = numbered_arg("file", numfile)))
 305     /* The first file doesn't need numbering. */
 306     if(numfile > 0 || !(file = cgi_get("file")))
 307       return;
 308   if((parts = numbered_arg("parts", numfile))
 309      || (parts = cgi_get("parts"))) {
 310     /* Default context is display.  Other contexts not actually tested. */
 311     if(!(context = numbered_arg("context", numfile))) context = "display";
 312     partslist = split(parts, 0, 0, act_prefs_errors, 0);
 313     while((part = *partslist++)) {
 314       if(!(value = numbered_arg(part, numfile)))
 315         continue;
 316       /* If it's already right (whether regexps or db) don't change anything,
 317        * so we don't fill the database up with rubbish. */
 318       if(disorder_part(ds->g->client, (char **)&current,
 319                        file, context, part))
 320         fatal(0, "disorder_part() failed");
 321       if(!strcmp(current, value))
 322         continue;
 323       byte_xasprintf((char **)&name, "trackname_%s_%s", context, part);
 324       disorder_set(ds->g->client, file, name, value);
 325     }
 326     if((value = numbered_arg("random", numfile)))
 327       disorder_unset(ds->g->client, file, "pick_at_random");
 328     else
 329       disorder_set(ds->g->client, file, "pick_at_random", "0");
 330     if((value = numbered_arg("tags", numfile))) {
 331       if(!*value)
 332         disorder_unset(ds->g->client, file, "tags");
 333       else
 334         disorder_set(ds->g->client, file, "tags", value);
 335     }
 336     if((value = numbered_arg("weight", numfile))) {
 337       if(!*value || !strcmp(value, "90000"))
 338         disorder_unset(ds->g->client, file, "weight");
 339       else
 340         disorder_set(ds->g->client, file, "weight", value);
 341     }
 342   } else if((name = cgi_get("name"))) {
 343     /* Raw preferences.  Not well supported in the templates at the moment. */
 344     value = cgi_get("value");
 345     if(value)
 346       disorder_set(ds->g->client, file, name, value);
 347     else
 348       disorder_unset(ds->g->client, file, name);
 349   }
 350 }
 351
 352 static void act_prefs(cgi_sink *output, dcgi_state *ds) {
 353   const char *files;
 354   int nfiles, numfile;
 355
 356   if((files = cgi_get("files"))) nfiles = atoi(files);
 357   else nfiles = 1;
 358   for(numfile = 0; numfile < nfiles; ++numfile)
 359     process_prefs(ds, numfile);
 360   cgi_header(output->sink, "Content-Type", "text/html");
 361   header_cookie(output->sink);
 362   cgi_body(output->sink);
 363   expand(output, "prefs", ds);
 364 }
 365
 366 static void act_pause(cgi_sink *output,
 367                       dcgi_state *ds) {
 368   if(ds->g->client)
 369     disorder_pause(ds->g->client);
 370   redirect(output->sink);
 371 }
 372
 373 static void act_resume(cgi_sink *output,
 374                        dcgi_state *ds) {
 375   if(ds->g->client)
 376     disorder_resume(ds->g->client);
 377   redirect(output->sink);
 378 }
 379
 380 static void act_login(cgi_sink *output,
 381                       dcgi_state *ds) {
 382   const char *username, *password, *back;
 383   disorder_client *c;
 384
 385   username = cgi_get("username");
 386   password = cgi_get("password");
 387   if(!username || !password
 388      || !strcmp(username, "guest")/*bodge to avoid guest cookies*/) {
 389     /* We're just visiting the login page */
 390     expand_template(ds, output, "login");
 391     return;
 392   }
 393   /* We'll need a new connection as we are going to stop being guest */
 394   c = disorder_new(0);
 395   if(disorder_connect_user(c, username, password)) {
 396     cgi_set_option("error", "loginfailed");
 397     expand_template(ds, output, "login");
 398     return;
 399   }
 400   if(disorder_make_cookie(c, &login_cookie)) {
 401     cgi_set_option("error", "cookiefailed");
 402     expand_template(ds, output, "login");
 403     return;
 404   }
 405   /* Use the new connection henceforth */
 406   ds->g->client = c;
 407   ds->g->flags = 0;
 408   /* We have a new cookie */
 409   header_cookie(output->sink);
 410   cgi_set_option("status", "loginok");
 411   if((back = cgi_get("back")) && *back)
 412     /* Redirect back to somewhere or other */
 413     redirect(output->sink);
 414   else
 415     /* Stick to the login page */
 416     expand_template(ds, output, "login");
 417 }
 418
 419 static void act_logout(cgi_sink *output,
 420                        dcgi_state *ds) {
 421   disorder_revoke(ds->g->client);
 422   login_cookie = 0;
 423   /* Reconnect as guest */
 424   disorder_cgi_login(ds, output);
 425   /* Back to the login page */
 426   cgi_set_option("status", "logoutok");
 427   expand_template(ds, output, "login");
 428 }
 429
 430 static void act_register(cgi_sink *output,
 431                          dcgi_state *ds) {
 432   const char *username, *password, *password2, *email;
 433   char *confirm, *content_type;
 434   const char *text, *encoding, *charset;
 435
 436   username = cgi_get("username");
 437   password = cgi_get("password1");
 438   password2 = cgi_get("password2");
 439   email = cgi_get("email");
 440
 441   if(!username || !*username) {
 442     cgi_set_option("error", "nousername");
 443     expand_template(ds, output, "login");
 444     return;
 445   }
 446   if(!password || !*password) {
 447     cgi_set_option("error", "nopassword");
 448     expand_template(ds, output, "login");
 449     return;
 450   }
 451   if(!password2 || !*password2 || strcmp(password, password2)) {
 452     cgi_set_option("error", "passwordmismatch");
 453     expand_template(ds, output, "login");
 454     return;
 455   }
 456   if(!email || !*email) {
 457     cgi_set_option("error", "noemail");
 458     expand_template(ds, output, "login");
 459     return;
 460   }
 461   /* We could well do better address validation but for now we'll just do the
 462    * minimum */
 463   if(!strchr(email, '@')) {
 464     cgi_set_option("error", "bademail");
 465     expand_template(ds, output, "login");
 466     return;
 467   }
 468   if(disorder_register(ds->g->client, username, password, email, &confirm)) {
 469     cgi_set_option("error", "cannotregister");
 470     expand_template(ds, output, "login");
 471     return;
 472   }
 473   /* Send the user a mail */
 474   /* TODO templatize this */
 475   byte_xasprintf((char **)&text,
 476                  "Welcome to DisOrder.  To active your login, please visit this URL:\n"
 477                  "\n"
 478                  "%s?c=%s\n", config->url, urlencodestring(confirm));
 479   if(!(text = mime_encode_text(text, &charset, &encoding)))
 480     fatal(0, "cannot encode email");
 481   byte_xasprintf(&content_type, "text/plain;charset=%s",
 482                  quote822(charset, 0));
 483   sendmail("", config->mail_sender, email, "Welcome to DisOrder",
 484            encoding, content_type, text); /* TODO error checking  */
 485   /* We'll go back to the login page with a suitable message */
 486   cgi_set_option("status", "registered");
 487   expand_template(ds, output, "login");
 488 }
 489
 490 static void act_confirm(cgi_sink *output,
 491                         dcgi_state *ds) {
 492   const char *confirmation;
 493
 494   if(!(confirmation = cgi_get("c"))) {
 495     cgi_set_option("error", "noconfirm");
 496     expand_template(ds, output, "login");
 497   }
 498   /* Confirm our registration */
 499   if(disorder_confirm(ds->g->client, confirmation)) {
 500     cgi_set_option("error", "badconfirm");
 501     expand_template(ds, output, "login");
 502   }
 503   /* Get a cookie */
 504   if(disorder_make_cookie(ds->g->client, &login_cookie)) {
 505     cgi_set_option("error", "cookiefailed");
 506     expand_template(ds, output, "login");
 507     return;
 508   }
 509   /* Discard any cached data JIC */
 510   ds->g->flags = 0;
 511   /* We have a new cookie */
 512   header_cookie(output->sink);
 513   cgi_set_option("status", "confirmed");
 514   expand_template(ds, output, "login");
 515 }
 516
 517 static void act_edituser(cgi_sink *output,
 518                          dcgi_state *ds) {
 519   const char *email = cgi_get("email"), *password = cgi_get("changepassword1");
 520   const char *password2 = cgi_get("changepassword2");
 521   int newpassword = 0;
 522   disorder_client *c;
 523
 524   if((password && *password) || (password && *password2)) {
 525     if(!password || !password2 || strcmp(password, password2)) {
 526       cgi_set_option("error", "passwordmismatch");
 527       expand_template(ds, output, "login");
 528       return;
 529     }
 530   } else
 531     password = password2 = 0;
 532
 533   if(email) {
 534     if(disorder_edituser(ds->g->client, disorder_user(ds->g->client),
 535                          "email", email)) {
 536       cgi_set_option("error", "badedit");
 537       expand_template(ds, output, "login");
 538       return;
 539     }
 540   }
 541   if(password) {
 542     if(disorder_edituser(ds->g->client, disorder_user(ds->g->client),
 543                          "password", password)) {
 544       cgi_set_option("error", "badedit");
 545       expand_template(ds, output, "login");
 546       return;
 547     }
 548     newpassword = 1;
 549   }
 550   if(newpassword) {
 551     login_cookie = 0;                   /* it'll be invalid now */
 552     /* This is a bit duplicative of act_login() */
 553     c = disorder_new(0);
 554     if(disorder_connect_user(c, disorder_user(ds->g->client), password)) {
 555       cgi_set_option("error", "loginfailed");
 556       expand_template(ds, output, "login");
 557       return;
 558     }
 559     if(disorder_make_cookie(c, &login_cookie)) {
 560       cgi_set_option("error", "cookiefailed");
 561       expand_template(ds, output, "login");
 562       return;
 563     }
 564     /* Use the new connection henceforth */
 565     ds->g->client = c;
 566     ds->g->flags = 0;
 567     /* We have a new cookie */
 568     header_cookie(output->sink);
 569   }
 570   cgi_set_option("status", "edited");
 571   expand_template(ds, output, "login");
 572 }
 573
 574 static void act_reminder(cgi_sink *output,
 575                          dcgi_state *ds) {
 576   const char *const username = cgi_get("username");
 577
 578   if(!username || !*username) {
 579     cgi_set_option("error", "nousername");
 580     expand_template(ds, output, "login");
 581     return;
 582   }
 583   if(disorder_reminder(ds->g->client, username)) {
 584     cgi_set_option("error", "reminderfailed");
 585     expand_template(ds, output, "login");
 586     return;
 587   }
 588   cgi_set_option("status", "reminded");
 589   expand_template(ds, output, "login");
 590 }
 591
 592 /* expansions *****************************************************************/
 593
 594 static void exp_label(int attribute((unused)) nargs,
 595                       char **args,
 596                       cgi_sink *output,
 597                       void attribute((unused)) *u) {
 598   cgi_output(output, "%s", cgi_label(args[0]));
 599 }
 600
 601 struct trackinfo_state {
 602   dcgi_state *ds;
 603   const struct queue_entry *q;
 604   long length;
 605   time_t when;
 606 };
 607
 608 struct result {
 609   char *track;
 610   const char *sort;
 611 };
 612
 613 static int compare_result(const void *a, const void *b) {
 614   const struct result *ra = a, *rb = b;
 615   int c;
 616
 617   if(!(c = strcmp(ra->sort, rb->sort)))
 618     c = strcmp(ra->track, rb->track);
 619   return c;
 620 }
 621
 622 static void exp_search(int nargs,
 623                        char **args,
 624                        cgi_sink *output,
 625                        void *u) {
 626   dcgi_state *ds = u, substate;
 627   char **tracks;
 628   const char *q, *context, *part, *template;
 629   int ntracks, n, m;
 630   struct result *r;
 631
 632   switch(nargs) {
 633   case 2:
 634     part = args[0];
 635     context = "sort";
 636     template = args[1];
 637     break;
 638   case 3:
 639     part = args[0];
 640     context = args[1];
 641     template = args[2];
 642     break;
 643   default:
 644     assert(!"should never happen");
 645     part = context = template = 0;      /* quieten compiler */
 646   }
 647   if(ds->tracks == 0) {
 648     /* we are the top level, let's get some search results */
 649     if(!(q = cgi_get("query"))) return; /* no results yet */
 650     if(disorder_search(ds->g->client, q, &tracks, &ntracks)) return;
 651     if(!ntracks) return;
 652   } else {
 653     tracks = ds->tracks;
 654     ntracks = ds->ntracks;
 655   }
 656   assert(ntracks != 0);
 657   /* sort tracks by the appropriate part */
 658   r = xmalloc(ntracks * sizeof *r);
 659   for(n = 0; n < ntracks; ++n) {
 660     r[n].track = tracks[n];
 661     if(disorder_part(ds->g->client, (char **)&r[n].sort,
 662                      tracks[n], context, part))
 663       fatal(0, "disorder_part() failed");
 664   }
 665   qsort(r, ntracks, sizeof (struct result), compare_result);
 666   /* expand the 2nd arg once for each group.  We re-use the passed-in tracks
 667    * array as we know it's guaranteed to be big enough and isn't going to be
 668    * used for anything else any more. */
 669   memset(&substate, 0, sizeof substate);
 670   substate.g = ds->g;
 671   substate.first = 1;
 672   n = 0;
 673   while(n < ntracks) {
 674     substate.tracks = tracks;
 675     substate.ntracks = 0;
 676     m = n;
 677     while(m < ntracks
 678           && !strcmp(r[m].sort, r[n].sort))
 679       tracks[substate.ntracks++] = r[m++].track;
 680     substate.last = (m == ntracks);
 681     expandstring(output, template, &substate);
 682     substate.index++;
 683     substate.first = 0;
 684     n = m;
 685   }
 686   assert(substate.last != 0);
 687 }
 688
 689 static void exp_stats(int attribute((unused)) nargs,
 690                       char attribute((unused)) **args,
 691                       cgi_sink *output,
 692                       void *u) {
 693   dcgi_state *ds = u;
 694   char **v;
 695
 696   cgi_opentag(output->sink, "pre", "class", "stats", (char *)0);
 697   if(!disorder_stats(ds->g->client, &v, 0)) {
 698     while(*v)
 699       cgi_output(output, "%s\n", *v++);
 700   }
 701   cgi_closetag(output->sink, "pre");
 702 }
 703
 704 static char *expandarg(const char *arg, dcgi_state *ds) {
 705   struct dynstr d;
 706   cgi_sink output;
 707
 708   dynstr_init(&d);
 709   output.quote = 0;
 710   output.sink = sink_dynstr(&d);
 711   expandstring(&output, arg, ds);
 712   dynstr_terminate(&d);
 713   return d.vec;
 714 }
 715
 716 static void exp_isfiles(int attribute((unused)) nargs,
 717                         char attribute((unused)) **args,
 718                         cgi_sink *output,
 719                         void *u) {
 720   dcgi_state *ds = u;
 721
 722   lookups(ds, DC_FILES);
 723   sink_printf(output->sink, "%s", bool2str(!!ds->g->nfiles));
 724 }
 725
 726 static void exp_isdirectories(int attribute((unused)) nargs,
 727                               char attribute((unused)) **args,
 728                               cgi_sink *output,
 729                               void *u) {
 730   dcgi_state *ds = u;
 731
 732   lookups(ds, DC_DIRS);
 733   sink_printf(output->sink, "%s", bool2str(!!ds->g->ndirs));
 734 }
 735
 736 static void exp_choose(int attribute((unused)) nargs,
 737                        char **args,
 738                        cgi_sink *output,
 739                        void *u) {
 740   dcgi_state *ds = u;
 741   dcgi_state substate;
 742   int nfiles, n;
 743   char **files;
 744   struct entry *e;
 745   const char *type, *what = expandarg(args[0], ds);
 746
 747   if(!strcmp(what, "files")) {
 748     lookups(ds, DC_FILES);
 749     files = ds->g->files;
 750     nfiles = ds->g->nfiles;
 751     type = "track";
 752   } else if(!strcmp(what, "directories")) {
 753     lookups(ds, DC_DIRS);
 754     files = ds->g->dirs;
 755     nfiles = ds->g->ndirs;
 756     type = "dir";
 757   } else {
 758     error(0, "unknown @choose@ argument '%s'", what);
 759     return;
 760   }
 761   e = xmalloc(nfiles * sizeof (struct entry));
 762   for(n = 0; n < nfiles; ++n) {
 763     e[n].path = files[n];
 764     e[n].sort = trackname_transform(type, files[n], "sort");
 765     e[n].display = trackname_transform(type, files[n], "display");
 766   }
 767   qsort(e, nfiles, sizeof (struct entry), compare_entry);
 768   memset(&substate, 0, sizeof substate);
 769   substate.g = ds->g;
 770   substate.first = 1;
 771   for(n = 0; n < nfiles; ++n) {
 772     substate.last = (n == nfiles - 1);
 773     substate.index = n;
 774     substate.entry = &e[n];
 775     expandstring(output, args[1], &substate);
 776     substate.first = 0;
 777   }
 778 }
 779
 780 static void exp_file(int attribute((unused)) nargs,
 781                      char attribute((unused)) **args,
 782                      cgi_sink *output,
 783                      void *u) {
 784   dcgi_state *ds = u;
 785
 786   if(ds->entry)
 787     cgi_output(output, "%s", ds->entry->path);
 788   else if(ds->track)
 789     cgi_output(output, "%s", ds->track->track);
 790   else if(ds->tracks)
 791     cgi_output(output, "%s", ds->tracks[0]);
 792 }
 793
 794 static void exp_navigate(int attribute((unused)) nargs,
 795                          char **args,
 796                          cgi_sink *output,
 797                          void *u) {
 798   dcgi_state *ds = u;
 799   dcgi_state substate;
 800   const char *path = expandarg(args[0], ds);
 801   const char *ptr;
 802   int dirlen;
 803
 804   if(*path) {
 805     memset(&substate, 0, sizeof substate);
 806     substate.g = ds->g;
 807     ptr = path + 1;                     /* skip root */
 808     dirlen = 0;
 809     substate.nav_path = path;
 810     substate.first = 1;
 811     while(*ptr) {
 812       while(*ptr && *ptr != '/')
 813         ++ptr;
 814       substate.last = !*ptr;
 815       substate.nav_len = ptr - path;
 816       substate.nav_dirlen = dirlen;
 817       expandstring(output, args[1], &substate);
 818       dirlen = substate.nav_len;
 819       if(*ptr) ++ptr;
 820       substate.first = 0;
 821     }
 822   }
 823 }
 824
 825 static void exp_fullname(int attribute((unused)) nargs,
 826                          char attribute((unused)) **args,
 827                          cgi_sink *output,
 828                          void *u) {
 829   dcgi_state *ds = u;
 830   cgi_output(output, "%.*s", ds->nav_len, ds->nav_path);
 831 }
 832
 833 static void exp_basename(int nargs,
 834                          char **args,
 835                          cgi_sink *output,
 836                          void *u) {
 837   dcgi_state *ds = u;
 838   const char *s;
 839
 840   if(nargs) {
 841     if((s = strrchr(args[0], '/'))) ++s;
 842     else s = args[0];
 843     cgi_output(output, "%s", s);
 844   } else
 845     cgi_output(output, "%.*s", ds->nav_len - ds->nav_dirlen - 1,
 846                ds->nav_path + ds->nav_dirlen + 1);
 847 }
 848
 849 static void exp_dirname(int nargs,
 850                         char **args,
 851                         cgi_sink *output,
 852                         void *u) {
 853   dcgi_state *ds = u;
 854   const char *s;
 855
 856   if(nargs) {
 857     if((s = strrchr(args[0], '/')))
 858       cgi_output(output, "%.*s", (int)(s - args[0]), args[0]);
 859   } else
 860     cgi_output(output, "%.*s", ds->nav_dirlen, ds->nav_path);
 861 }
 862
 863 static void exp_files(int attribute((unused)) nargs,
 864                       char **args,
 865                       cgi_sink *output,
 866                       void *u) {
 867   dcgi_state *ds = u;
 868   dcgi_state substate;
 869   const char *nfiles_arg, *directory;
 870   int nfiles, numfile;
 871   struct kvp *k;
 872
 873   memset(&substate, 0, sizeof substate);
 874   substate.g = ds->g;
 875   if((directory = cgi_get("directory"))) {
 876     /* Prefs for whole directory. */
 877     lookups(ds, DC_FILES);
 878     /* Synthesize args for the file list. */
 879     nfiles = ds->g->nfiles;
 880     for(numfile = 0; numfile < nfiles; ++numfile) {
 881       k = xmalloc(sizeof *k);
 882       byte_xasprintf((char **)&k->name, "%d_file", numfile);
 883       k->value = ds->g->files[numfile];
 884       k->next = cgi_args;
 885       cgi_args = k;
 886     }
 887   } else {
 888     /* Args already present. */
 889     if((nfiles_arg = cgi_get("files"))) nfiles = atoi(nfiles_arg);
 890     else nfiles = 1;
 891   }
 892   for(numfile = 0; numfile < nfiles; ++numfile) {
 893     substate.index = numfile;
 894     expandstring(output, args[0], &substate);
 895   }
 896 }
 897
 898 static void exp_nfiles(int attribute((unused)) nargs,
 899                        char attribute((unused)) **args,
 900                        cgi_sink *output,
 901                        void *u) {
 902   dcgi_state *ds = u;
 903   const char *files_arg;
 904
 905   if(cgi_get("directory")) {
 906     lookups(ds, DC_FILES);
 907     cgi_output(output, "%d", ds->g->nfiles);
 908   } else if((files_arg = cgi_get("files")))
 909     cgi_output(output, "%s", files_arg);
 910   else
 911     cgi_output(output, "1");
 912 }
 913
 914 static void exp_image(int attribute((unused)) nargs,
 915                       char **args,
 916                       cgi_sink *output,
 917                       void attribute((unused)) *u) {
 918   char *labelname;
 919   const char *imagestem;
 920
 921   byte_xasprintf(&labelname, "images.%s", args[0]);
 922   if(cgi_label_exists(labelname))
 923     imagestem = cgi_label(labelname);
 924   else if(strchr(args[0], '.'))
 925     imagestem = args[0];
 926   else
 927     byte_xasprintf((char **)&imagestem, "%s.png", args[0]);
 928   if(cgi_label_exists("url.static"))
 929     cgi_output(output, "%s/%s", cgi_label("url.static"), imagestem);
 930   else
 931     cgi_output(output, "/disorder/%s", imagestem);
 932 }
 933
 934 /*
 935 Local Variables:
 936 c-basic-offset:2
 937 comment-column:40
 938 fill-column:79
 939 End:
 940 */