sys/src/cmd/mothra/forms.c

   1 /*
   2  * type=image is treated like submit
   3  */
   4 #include <u.h>
   5 #include <libc.h>
   6 #include <draw.h>
   7 #include <event.h>
   8 #include <panel.h>
   9 #include "mothra.h"
  10 #include "html.h"
  11 typedef struct Field Field;
  12 typedef struct Option Option;
  13 struct Form{
  14         int method;
  15         char *action;
  16         Field *fields, *efields;
  17         Form *next;
  18 };
  19 struct Field{
  20         Field *next;
  21         Form *form;
  22         char *name;
  23         char *value;
  24         int checked;
  25         int size;               /* should be a point, but that feature is deprecated */
  26         int maxlength;
  27         int type;
  28         int rows, cols;
  29         Option *options;
  30         int multiple;
  31         int state;              /* is the button marked? */
  32         Panel *p;
  33         Panel *pulldown;
  34         Panel *textwin;
  35 };
  36 /*
  37  * Field types
  38  */
  39 enum{
  40         TYPEIN=1,
  41         CHECK,
  42         PASSWD,
  43         RADIO,
  44         SUBMIT,
  45         RESET,
  46         SELECT,
  47         TEXTWIN,
  48         HIDDEN,
  49         INDEX,
  50 };
  51 struct Option{
  52         int selected;
  53         int def;
  54         char label[NLABEL+1];
  55         char *value;
  56         Option *next;
  57 };
  58 void h_checkinput(Panel *, int, int);
  59 void h_radioinput(Panel *, int, int);
  60 void h_submitinput(Panel *, int);
  61 void h_submittype(Panel *, char *);
  62 void h_submitindex(Panel *, char *);
  63 void h_resetinput(Panel *, int);
  64 void h_select(Panel *, int, int);
  65 void h_cut(Panel *, int);
  66 void h_paste(Panel *, int);
  67 void h_snarf(Panel *, int);
  68 void h_edit(Panel *);
  69 char *selgen(Panel *, int);
  70 char *nullgen(Panel *, int);
  71 Field *newfield(Form *form){
  72         Field *f;
  73         f=emallocz(sizeof(Field), 1);
  74         if(form->efields==0)
  75                 form->fields=f;
  76         else
  77                 form->efields->next=f;
  78         form->efields=f;
  79         f->next=0;
  80         f->form=form;
  81         return f;
  82 }
  83 /*
  84  * Called by rdhtml on seeing a forms-related tag
  85  */
  86 void rdform(Hglob *g){
  87         char *s;
  88         Field *f;
  89         Option *o, **op;
  90         Form *form;
  91         switch(g->tag){
  92         default:
  93                 fprint(2, "Bad tag <%s> in rdform (Can't happen!)\n", g->token);
  94                 return;
  95         case Tag_form:
  96                 if(g->form){
  97                         htmlerror(g->name, g->lineno, "nested forms illegal\n");
  98                         break;
  99                 }
 100                 g->form=emallocz(sizeof(Form), 1);
 101                 s=pl_getattr(g->attr, "action");
 102                 g->form->action=strdup((s && s[0]) ? s : g->dst->url->fullname);
 103                 s=pl_getattr(g->attr, "method");
 104                 if(s==0)
 105                         g->form->method=GET;
 106                 else if(cistrcmp(s, "post")==0)
 107                         g->form->method=POST;
 108                 else{
 109                         if(cistrcmp(s, "get")!=0)
 110                                 htmlerror(g->name, g->lineno,
 111                                         "unknown form method %s\n", s);
 112                         g->form->method=GET;
 113                 }
 114                 g->form->fields=0;
 115
 116                 g->form->next = g->dst->form;
 117                 g->dst->form = g->form;
 118
 119                 break;
 120         case Tag_input:
 121                 if(g->form==0){
 122                 BadTag:
 123                         htmlerror(g->name, g->lineno, "<%s> not in form, ignored\n",
 124                                 tag[g->tag].name);
 125                         break;
 126                 }
 127                 f=newfield(g->form);
 128                 s=pl_getattr(g->attr, "name");
 129                 if(s==0)
 130                         f->name=0;
 131                 else
 132                         f->name=strdup(s);
 133                 s=pl_getattr(g->attr, "value");
 134                 if(s==0)
 135                         f->value=strdup("");
 136                 else
 137                         f->value=strdup(s);
 138                 f->checked=pl_hasattr(g->attr, "checked");
 139                 s=pl_getattr(g->attr, "size");
 140                 if(s==0)
 141                         f->size=20;
 142                 else
 143                         f->size=atoi(s);
 144                 s=pl_getattr(g->attr, "maxlength");
 145                 if(s==0)
 146                         f->maxlength=0x3fffffff;
 147                 else
 148                         f->maxlength=atoi(s);
 149                 s=pl_getattr(g->attr, "type");
 150                 /* bug -- password treated as text */
 151                 if(s==0 || cistrcmp(s, "text")==0 || cistrcmp(s, "password")==0 || cistrcmp(s, "int")==0){
 152                         s=pl_getattr(g->attr, "name");
 153                         if(s!=0 && strcmp(s, "isindex")==0)
 154                                 f->type=INDEX;
 155                         else
 156                                 f->type=TYPEIN;
 157                         /*
 158                          * If there's exactly one attribute, use its value as the name,
 159                          * regardless of the attribute name.  This makes
 160                          * http://linus.att.com/ias/puborder.html work.
 161                          */
 162                         if(s==0){
 163                                 if(g->attr[0].name && g->attr[1].name==0)
 164                                         f->name=strdup(g->attr[0].value);
 165                                 else
 166                                         f->name=strdup("no-name");
 167                         }
 168                 }
 169                 else if(cistrcmp(s, "checkbox")==0)
 170                         f->type=CHECK;
 171                 else if(cistrcmp(s, "radio")==0)
 172                         f->type=RADIO;
 173                 else if(cistrcmp(s, "submit")==0)
 174                         f->type=SUBMIT;
 175                 else if(cistrcmp(s, "image")==0){
 176                         /* presotto's egregious hack to make image submits do something */
 177                         if(f->name){
 178                                 free(f->name);
 179                                 f->name=0;
 180                         }
 181                         f->type=SUBMIT;
 182                 } else if(cistrcmp(s, "reset")==0)
 183                         f->type=RESET;
 184                 else if(cistrcmp(s, "hidden")==0)
 185                         f->type=HIDDEN;
 186                 else{
 187                         htmlerror(g->name, g->lineno, "bad field type %s, ignored", s);
 188                         break;
 189                 }
 190                 if((f->type==CHECK || f->type==RADIO) && !pl_hasattr(g->attr, "value")){
 191                         free(f->value);
 192                         f->value=strdup("on");
 193                 }
 194                 if(f->type!=HIDDEN)
 195                         pl_htmloutput(g, g->nsp, f->value[0]?f->value:"blank field", f);
 196                 break;
 197         case Tag_select:
 198                 if(g->form==0) goto BadTag;
 199                 f=newfield(g->form);
 200                 s=pl_getattr(g->attr, "name");
 201                 if(s==0){
 202                         f->name=strdup("select");
 203                         htmlerror(g->name, g->lineno, "select has no name=\n");
 204                 }
 205                 else
 206                         f->name=strdup(s);
 207                 s=pl_getattr(g->attr, "size");
 208                 if(s==0) f->size=4;
 209                 else{
 210                         f->size=atoi(s);
 211                         if(f->size<=0) f->size=1;
 212                 }
 213                 f->multiple=pl_hasattr(g->attr, "multiple");
 214                 f->type=SELECT;
 215                 f->options=0;
 216                 g->text=g->token;
 217                 g->tp=g->text;
 218                 g->etext=g->text;
 219                 break;
 220         case Tag_option:
 221                 if(g->form==0) goto BadTag;
 222                 f=g->form->efields;
 223                 o=emallocz(sizeof(Option), 1);
 224                 for(op=&f->options;*op;op=&(*op)->next);
 225                 *op=o;
 226                 o->next=0;
 227                 g->text=o->label;
 228                 g->tp=o->label;
 229                 g->etext=o->label+NLABEL;
 230                 memset(o->label, 0, NLABEL+1);
 231                 *g->tp++=' ';
 232                 o->def=pl_hasattr(g->attr, "selected");
 233                 o->selected=o->def;
 234                 s=pl_getattr(g->attr, "value");
 235                 if(s==0)
 236                         o->value=o->label+1;
 237                 else
 238                         o->value=strdup(s);
 239                 break;
 240         case Tag_textarea:
 241                 if(g->form==0) goto BadTag;
 242                 f=newfield(g->form);
 243                 s=pl_getattr(g->attr, "name");
 244                 if(s==0){
 245                         f->name=strdup("enter text");
 246                         htmlerror(g->name, g->lineno, "select has no name=\n");
 247                 }
 248                 else
 249                         f->name=strdup(s);
 250                 s=pl_getattr(g->attr, "rows");
 251                 f->rows=s?atoi(s):8;
 252                 s=pl_getattr(g->attr, "cols");
 253                 f->cols=s?atoi(s):30;
 254                 f->type=TEXTWIN;
 255                 /* suck up initial text */
 256                 pl_htmloutput(g, g->nsp, f->name, f);
 257                 break;
 258         case Tag_isindex:
 259                 /*
 260                  * Make up a form with one tag, of type INDEX
 261                  * I have seen a page with <ISINDEX PROMPT="Enter a title here ">,
 262                  * which is nonstandard and not handled here.
 263                  */
 264                 form=emalloc(sizeof(Form));
 265                 form->fields=0;
 266                 form->efields=0;
 267                 s=pl_getattr(g->attr, "action");
 268                 form->action=strdup((s && s[0]) ? s : g->dst->url->fullname);
 269                 form->method=GET;
 270                 form->fields=0;
 271                 f=newfield(form);
 272                 f->name=0;
 273                 f->value=strdup("");
 274                 f->size=20;
 275                 f->maxlength=0x3fffffff;
 276                 f->type=INDEX;
 277                 pl_htmloutput(g, g->nsp, f->value[0]?f->value:"blank field", f);
 278                 break;
 279         }
 280 }
 281 /*
 282  * Called by rdhtml on seeing a forms-related end tag
 283  */
 284 void endform(Hglob *g){
 285         switch(g->tag){
 286         case Tag_form:
 287                 g->form=0;
 288                 break;
 289         case Tag_select:
 290                 if(g->form==0)
 291                         htmlerror(g->name, g->lineno, "</select> not in form, ignored\n");
 292                 else
 293                         pl_htmloutput(g, g->nsp, g->form->efields->name,g->form->efields);
 294                 break;
 295         case Tag_textarea:
 296                 break;
 297         }
 298 }
 299 char *nullgen(Panel *, int ){
 300         return 0;
 301 }
 302 char *selgen(Panel *p, int index){
 303         Option *a;
 304         Field *f;
 305         f=p->userp;
 306         if(f==0) return 0;
 307         for(a=f->options;index!=0 && a!=0;--index,a=a->next);
 308         if(a==0) return 0;
 309         a->label[0]=a->selected?'*':' ';
 310         return a->label;
 311 }
 312 char *seloption(Field *f){
 313         Option *a;
 314         for(a=f->options;a!=0;a=a->next)
 315                 if(a->selected)
 316                         return a->label+1;
 317         return f->name;
 318 }
 319 void mkfieldpanel(Rtext *t){
 320         Action *a;
 321         Panel *win, *scrl, *menu, *pop, *button;
 322         Field *f;
 323
 324         if((a = t->user) == nil)
 325                 return;
 326         if((f = a->field) == nil)
 327                 return;
 328
 329         f->p=0;
 330         switch(f->type){
 331         case TYPEIN:
 332                 f->p=plentry(0, 0, f->size*chrwidth, f->value, h_submittype);
 333                 break;
 334         case CHECK:
 335                 f->p=plcheckbutton(0, 0, "", h_checkinput);
 336                 f->state=f->checked;
 337                 plsetbutton(f->p, f->checked);
 338                 break;
 339         case RADIO:
 340                 f->p=plradiobutton(0, 0, "", h_radioinput);
 341                 f->state=f->checked;
 342                 plsetbutton(f->p, f->checked);
 343                 break;
 344         case SUBMIT:
 345                 f->p=plbutton(0, 0, f->value[0]?f->value:"submit", h_submitinput);
 346                 break;
 347         case RESET:
 348                 f->p=plbutton(0, 0, f->value[0]?f->value:"reset", h_resetinput);
 349                 break;
 350         case SELECT:
 351                 f->pulldown=plgroup(0,0);
 352                 scrl=plscrollbar(f->pulldown, PACKW|FILLY);
 353                 win=pllist(f->pulldown, PACKN, nullgen, f->size, h_select);
 354                 win->userp=f;
 355                 plinitlist(win, PACKN, selgen, f->size, h_select);
 356                 plscroll(win, 0, scrl);
 357                 plpack(f->pulldown, Rect(0,0,1024,1024));
 358                 f->p=plpulldown(0, FIXEDX, seloption(f), f->pulldown, PACKS);
 359                 f->p->fixedsize.x=f->pulldown->r.max.x-f->pulldown->r.min.x;
 360                 break;
 361         case TEXTWIN:
 362                 menu=plgroup(0,0);
 363                 f->p=plframe(0,0);
 364                 pllabel(f->p, PACKN|FILLX, f->name);
 365                 scrl=plscrollbar(f->p, PACKW|FILLY);
 366                 pop=plpopup(f->p, PACKN|FILLX, 0, menu, 0);
 367                 f->textwin=pledit(pop, EXPAND, Pt(f->cols*chrwidth, f->rows*font->height),
 368                         0, 0, h_edit);
 369                 f->textwin->userp=f;
 370                 button=plbutton(menu, PACKN|FILLX, "cut", h_cut);
 371                 button->userp=f->textwin;
 372                 button=plbutton(menu, PACKN|FILLX, "paste", h_paste);
 373                 button->userp=f->textwin;
 374                 button=plbutton(menu, PACKN|FILLX, "snarf", h_snarf);
 375                 button->userp=f->textwin;
 376                 plscroll(f->textwin, 0, scrl);
 377                 break;
 378         case INDEX:
 379                 f->p=plentry(0, 0, f->size*chrwidth, f->value, h_submitindex);
 380                 break;
 381         }
 382         if(f->p){
 383                 f->p->userp=f;
 384                 free(t->text);
 385                 t->text=0;
 386                 t->p=f->p;
 387                 t->hot=1;
 388         }
 389 }
 390 void h_checkinput(Panel *p, int, int v){
 391         ((Field *)p->userp)->state=v;
 392 }
 393 void h_radioinput(Panel *p, int, int v){
 394         Field *f, *me;
 395         me=p->userp;
 396         me->state=v;
 397         if(v){
 398                 for(f=me->form->fields;f;f=f->next)
 399                         if(f->type==RADIO && f!=me && strcmp(f->name, me->name)==0){
 400                                 plsetbutton(f->p, 0);
 401                                 f->state=0;
 402                                 pldraw(f->p, screen);
 403                         }
 404         }
 405 }
 406 void h_select(Panel *p, int, int index){
 407         Option *a;
 408         Field *f;
 409         f=p->userp;
 410         if(f==0) return;
 411         if(!f->multiple) for(a=f->options;a;a=a->next) a->selected=0;
 412         for(a=f->options;index!=0 && a!=0;--index,a=a->next);
 413         if(a==0) return;
 414         a->selected=!a->selected;
 415         plinitpulldown(f->p, FIXEDX, seloption(f), f->pulldown, PACKS);
 416         pldraw(f->p, screen);
 417 }
 418 void h_resetinput(Panel *p, int){
 419         Field *f;
 420         Option *o;
 421         for(f=((Field *)p->userp)->form->fields;f;f=f->next) switch(f->type){
 422         case TYPEIN:
 423         case PASSWD:
 424                 plinitentry(f->p, 0, f->size*chrwidth, f->value, 0);
 425                 break;
 426         case CHECK:
 427         case RADIO:
 428                 f->state=f->checked;
 429                 plsetbutton(f->p, f->checked);
 430                 break;
 431         case SELECT:
 432                 for(o=f->options;o;o=o->next)
 433                         o->selected=o->def;
 434                 break;
 435         }
 436         pldraw(text, screen);
 437 }
 438 void h_edit(Panel *p){
 439         plgrabkb(p);
 440 }
 441 Rune *snarfbuf=0;
 442 int nsnarfbuf=0;
 443 void h_snarf(Panel *p, int){
 444         int s0, s1;
 445         Rune *text;
 446         p=p->userp;
 447         plegetsel(p, &s0, &s1);
 448         if(s0==s1) return;
 449         text=pleget(p);
 450         if(snarfbuf) free(snarfbuf);
 451         nsnarfbuf=s1-s0;
 452         snarfbuf=malloc(nsnarfbuf*sizeof(Rune));
 453         if(snarfbuf==0){
 454                 fprint(2, "No mem\n");
 455                 exits("no mem");
 456         }
 457         memmove(snarfbuf, text+s0, nsnarfbuf*sizeof(Rune));
 458 }
 459 void h_cut(Panel *p, int b){
 460         h_snarf(p, b);
 461         plepaste(p->userp, 0, 0);
 462 }
 463 void h_paste(Panel *p, int){
 464         plepaste(p->userp, snarfbuf, nsnarfbuf);
 465 }
 466 int ulen(char *s){
 467         int len;
 468         len=0;
 469         for(;*s;s++){
 470                 if(strchr("/$-_@.!*'(), ", *s)
 471                 || 'a'<=*s && *s<='z'
 472                 || 'A'<=*s && *s<='Z'
 473                 || '0'<=*s && *s<='9')
 474                         len++;
 475                 else
 476                         len+=3;
 477         }
 478         return len;
 479 }
 480 int hexdigit(int v){
 481         return 0<=v && v<=9?'0'+v:'A'+v-10;
 482 }
 483 char *ucpy(char *buf, char *s){
 484         for(;*s;s++){
 485                 if(strchr("/$-_@.!*'(),", *s)
 486                 || 'a'<=*s && *s<='z'
 487                 || 'A'<=*s && *s<='Z'
 488                 || '0'<=*s && *s<='9')
 489                         *buf++=*s;
 490                 else if(*s==' ')
 491                         *buf++='+';
 492                 else{
 493                         *buf++='%';
 494                         *buf++=hexdigit((*s>>4)&15);
 495                         *buf++=hexdigit(*s&15);
 496                 }
 497         }
 498         *buf='\0';
 499         return buf;
 500 }
 501 char *runetou(char *buf, Rune r){
 502         char rbuf[2];
 503         if(r<=255){
 504                 rbuf[0]=r;
 505                 rbuf[1]='\0';
 506                 buf=ucpy(buf, rbuf);
 507         }
 508         return buf;
 509 }
 510 /*
 511  * If there's exactly one button with type=text, then
 512  * a CR in the button is supposed to submit the form.
 513  */
 514 void h_submittype(Panel *p, char *){
 515         int ntype;
 516         Field *f;
 517         ntype=0;
 518         for(f=((Field *)p->userp)->form->fields;f;f=f->next) if(f->type==TYPEIN) ntype++;
 519         if(ntype==1) h_submitinput(p, 0);
 520 }
 521 void h_submitindex(Panel *p, char *){
 522         h_submitinput(p, 0);
 523 }
 524 void h_submitinput(Panel *p, int){
 525         Form *form;
 526         int size, nrune;
 527         char *buf, *bufp, sep;
 528         Rune *rp;
 529         Field *f;
 530         Option *o;
 531         form=((Field *)p->userp)->form;
 532         if(form->method==GET) size=ulen(form->action)+1;
 533         else size=1;
 534         for(f=form->fields;f;f=f->next) switch(f->type){
 535         case TYPEIN:
 536         case PASSWD:
 537                 size+=ulen(f->name)+1+ulen(plentryval(f->p))+1;
 538                 break;
 539         case INDEX:
 540                 size+=ulen(plentryval(f->p))+1;
 541                 break;
 542         case CHECK:
 543         case RADIO:
 544                 if(!f->state) break;
 545         case HIDDEN:
 546                 size+=ulen(f->name)+1+ulen(f->value)+1;
 547                 break;
 548         case SELECT:
 549                 for(o=f->options;o;o=o->next)
 550                         if(o->selected)
 551                                 size+=ulen(f->name)+1+ulen(o->value)+1;
 552                 break;
 553         case TEXTWIN:
 554                 size+=ulen(f->name)+1+plelen(f->textwin)*3+1;
 555                 break;
 556         }
 557         buf=emalloc(size);
 558         if(form->method==GET){
 559                 strcpy(buf, form->action);
 560                 sep='?';
 561         }
 562         else{
 563                 buf[0]='\0';
 564                 sep=0;
 565         }
 566         bufp=buf+strlen(buf);
 567         if(form->method==GET && bufp!=buf && bufp[-1]=='?') *--bufp='\0'; /* spurious ? */
 568         for(f=form->fields;f;f=f->next) switch(f->type){
 569         case TYPEIN:
 570         case PASSWD:
 571                 if(sep) *bufp++=sep;
 572                 sep='&';
 573                 bufp=ucpy(bufp, f->name);
 574                 *bufp++='=';
 575                 bufp=ucpy(bufp, plentryval(f->p));
 576                 break;
 577         case INDEX:
 578                 if(sep) *bufp++=sep;
 579                 sep='&';
 580                 bufp=ucpy(bufp, plentryval(f->p));
 581                 break;
 582         case CHECK:
 583         case RADIO:
 584                 if(!f->state) break;
 585         case HIDDEN:
 586                 if(sep) *bufp++=sep;
 587                 sep='&';
 588                 bufp=ucpy(bufp, f->name);
 589                 *bufp++='=';
 590                 bufp=ucpy(bufp, f->value);
 591                 break;
 592         case SELECT:
 593                 for(o=f->options;o;o=o->next)
 594                         if(o->selected){
 595                                 if(sep) *bufp++=sep;
 596                                 sep='&';
 597                                 bufp=ucpy(bufp, f->name);
 598                                 *bufp++='=';
 599                                 bufp=ucpy(bufp, o->value);
 600                         }
 601                 break;
 602         case TEXTWIN:
 603                 if(sep) *bufp++=sep;
 604                 sep='&';
 605                 bufp=ucpy(bufp, f->name);
 606                 *bufp++='=';
 607                 rp=pleget(f->textwin);
 608                 for(nrune=plelen(f->textwin);nrune!=0;--nrune)
 609                         bufp=runetou(bufp, *rp++);
 610                 *bufp='\0';
 611                 break;
 612         }
 613         if(form->method==GET){
 614                 if(debug)fprint(2, "GET %s\n", buf);
 615                 geturl(buf, GET, 0, 0, 0);
 616         }
 617         else{
 618                 if(debug)fprint(2, "POST %s: %s\n", form->action, buf);
 619                 geturl(form->action, POST, buf, 0, 0);
 620         }
 621         free(buf);
 622 }
 623
 624 void freeform(void *p)
 625 {
 626         Form *form;
 627         Field *f;
 628         Option *o;
 629
 630         while(form = p){
 631                 p = form->next;
 632                 free(form->action);
 633                 while(f = form->fields){
 634                         form->fields = f->next;
 635
 636                         if(f->p!=0)
 637                                 plfree(f->p);
 638
 639                         free(f->name);
 640                         free(f->value);
 641
 642                         while(o = f->options){
 643                                 f->options = o->next;
 644                                 if(o->value != o->label+1)
 645                                         free(o->value);
 646                                 free(o);
 647                         }
 648
 649                         free(f);
 650                 }
 651                 free(form);
 652         }
 653 }