src/afb-xreq.c

   1 /*
   2  * Copyright (C) 2017 "IoT.bzh"
   3  * Author José Bollo <jose.bollo@iot.bzh>
   4  *
   5  * Licensed under the Apache License, Version 2.0 (the "License");
   6  * you may not use this file except in compliance with the License.
   7  * You may obtain a copy of the License at
   8  *
   9  *   http://www.apache.org/licenses/LICENSE-2.0
  10  *
  11  * Unless required by applicable law or agreed to in writing, software
  12  * distributed under the License is distributed on an "AS IS" BASIS,
  13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  14  * See the License for the specific language governing permissions and
  15  * limitations under the License.
  16  */
  17
  18 #define _GNU_SOURCE
  19
  20 #include <stdlib.h>
  21 #include <stdio.h>
  22 #include <string.h>
  23 #include <errno.h>
  24
  25 #include <json-c/json.h>
  26 #include <afb/afb-binding-v1.h>
  27 #include <afb/afb-binding-v2.h>
  28
  29 #include "afb-context.h"
  30 #include "afb-xreq.h"
  31 #include "afb-evt.h"
  32 #include "afb-msg-json.h"
  33 #include "afb-cred.h"
  34 #include "afb-hook.h"
  35 #include "afb-api.h"
  36 #include "afb-apiset.h"
  37 #include "afb-auth.h"
  38 #include "jobs.h"
  39 #include "verbose.h"
  40
  41 /******************************************************************************/
  42
  43 static inline void xreq_addref(struct afb_xreq *xreq)
  44 {
  45         __atomic_add_fetch(&xreq->refcount, 1, __ATOMIC_RELAXED);
  46 }
  47
  48 static inline void xreq_unref(struct afb_xreq *xreq)
  49 {
  50         if (!__atomic_sub_fetch(&xreq->refcount, 1, __ATOMIC_RELAXED)) {
  51                 if (!xreq->replied)
  52                         afb_xreq_fail(xreq, "error", "no reply");
  53                 if (xreq->hookflags)
  54                         afb_hook_xreq_end(xreq);
  55                 if (xreq->caller)
  56                         xreq_unref(xreq->caller);
  57                 xreq->queryitf->unref(xreq);
  58         }
  59 }
  60
  61 /******************************************************************************/
  62
  63 extern const struct afb_req_itf xreq_itf;
  64 extern const struct afb_req_itf xreq_hooked_itf;
  65
  66 static inline struct afb_req to_req(struct afb_xreq *xreq)
  67 {
  68         return (struct afb_req){ .itf = xreq->hookflags ? &xreq_hooked_itf : &xreq_itf, .closure = xreq };
  69 }
  70
  71 /******************************************************************************/
  72
  73 struct subcall
  74 {
  75         struct afb_xreq xreq;
  76
  77         void (*completion)(struct subcall*, int, struct json_object*);
  78
  79         union {
  80                 struct {
  81                         struct jobloop *jobloop;
  82                         struct json_object *result;
  83                         int status;
  84                 };
  85                 struct {
  86                         union {
  87                                 void (*callback)(void*, int, struct json_object*);
  88                                 void (*callback2)(void*, int, struct json_object*, struct afb_req);
  89                         };
  90                         void *closure;
  91                 };
  92         };
  93 };
  94
  95 static int subcall_subscribe_cb(struct afb_xreq *xreq, struct afb_event event)
  96 {
  97         struct subcall *subcall = CONTAINER_OF_XREQ(struct subcall, xreq);
  98
  99         return afb_xreq_subscribe(subcall->xreq.caller, event);
 100 }
 101
 102 static int subcall_unsubscribe_cb(struct afb_xreq *xreq, struct afb_event event)
 103 {
 104         struct subcall *subcall = CONTAINER_OF_XREQ(struct subcall, xreq);
 105
 106         return afb_xreq_unsubscribe(subcall->xreq.caller, event);
 107 }
 108
 109 static void subcall_reply_cb(struct afb_xreq *xreq, int status, struct json_object *result)
 110 {
 111         struct subcall *subcall = CONTAINER_OF_XREQ(struct subcall, xreq);
 112
 113         subcall->completion(subcall, status, result);
 114         json_object_put(result);
 115         afb_xreq_unref(&subcall->xreq);
 116 }
 117
 118 static void subcall_destroy_cb(struct afb_xreq *xreq)
 119 {
 120         struct subcall *subcall = CONTAINER_OF_XREQ(struct subcall, xreq);
 121
 122         json_object_put(subcall->xreq.json);
 123         afb_cred_unref(subcall->xreq.cred);
 124         free(subcall);
 125 }
 126
 127 const struct afb_xreq_query_itf afb_xreq_subcall_itf = {
 128         .reply = subcall_reply_cb,
 129         .unref = subcall_destroy_cb,
 130         .subscribe = subcall_subscribe_cb,
 131         .unsubscribe = subcall_unsubscribe_cb
 132 };
 133
 134 static struct subcall *subcall_alloc(
 135                 struct afb_xreq *caller,
 136                 const char *api,
 137                 const char *verb,
 138                 struct json_object *args
 139 )
 140 {
 141         struct subcall *subcall;
 142         size_t lenapi, lenverb;
 143         char *copy;
 144
 145         lenapi = 1 + strlen(api);
 146         lenverb = 1 + strlen(verb);
 147         subcall = malloc(lenapi + lenverb + sizeof *subcall);
 148         if (!subcall)
 149                 ERROR("out of memory");
 150         else {
 151                 copy = (char*)&subcall[1];
 152                 memcpy(copy, api, lenapi);
 153                 api = copy;
 154                 copy = &copy[lenapi];
 155                 memcpy(copy, verb, lenverb);
 156                 verb = copy;
 157
 158                 afb_xreq_init(&subcall->xreq, &afb_xreq_subcall_itf);
 159                 afb_context_subinit(&subcall->xreq.context, &caller->context);
 160                 subcall->xreq.cred = afb_cred_addref(caller->cred);
 161                 subcall->xreq.json = args;
 162                 subcall->xreq.api = api;
 163                 subcall->xreq.verb = verb;
 164                 subcall->xreq.caller = caller;
 165                 xreq_addref(caller);
 166         }
 167         return subcall;
 168 }
 169
 170
 171 static void subcall_on_reply(struct subcall *subcall, int status, struct json_object *result)
 172 {
 173         subcall->callback(subcall->closure, status, result);
 174 }
 175
 176 static void subcall_req_on_reply(struct subcall *subcall, int status, struct json_object *result)
 177 {
 178         subcall->callback2(subcall->closure, status, result, to_req(subcall->xreq.caller));
 179 }
 180
 181 static void subcall_hooked_on_reply(struct subcall *subcall, int status, struct json_object *result)
 182 {
 183         afb_hook_xreq_subcall_result(subcall->xreq.caller, status, result);
 184         subcall_on_reply(subcall, status, result);
 185 }
 186
 187 static void subcall_req_hooked_on_reply(struct subcall *subcall, int status, struct json_object *result)
 188 {
 189         afb_hook_xreq_subcall_req_result(subcall->xreq.caller, status, result);
 190         subcall_req_on_reply(subcall, status, result);
 191 }
 192
 193 static void subcall_reply_direct_cb(void *closure, int status, struct json_object *result)
 194 {
 195         struct afb_xreq *xreq = closure;
 196
 197         if (xreq->replied) {
 198                 ERROR("subcall replied more than one time!!");
 199                 json_object_put(result);
 200         } else {
 201                 xreq->replied = 1;
 202                 subcall_reply_cb(xreq, status, result);
 203         }
 204 }
 205
 206 static void subcall_process(struct subcall *subcall, void (*completion)(struct subcall*, int, struct json_object*))
 207 {
 208         subcall->completion = completion;
 209         if (subcall->xreq.caller->queryitf->subcall) {
 210                 subcall->xreq.caller->queryitf->subcall(
 211                         subcall->xreq.caller, subcall->xreq.api, subcall->xreq.verb,
 212                         subcall->xreq.json, subcall_reply_direct_cb, &subcall->xreq);
 213         } else {
 214                 afb_xreq_addref(&subcall->xreq);
 215                 afb_xreq_process(&subcall->xreq, subcall->xreq.caller->apiset);
 216         }
 217 }
 218
 219 static void subcall(struct subcall *subcall, void (*callback)(void*, int, struct json_object*), void *cb_closure)
 220 {
 221         subcall->callback = callback;
 222         subcall->closure = cb_closure;
 223         subcall_process(subcall, subcall_on_reply);
 224 }
 225
 226 static void subcall_req(struct subcall *subcall, void (*callback)(void*, int, struct json_object*, struct afb_req), void *cb_closure)
 227 {
 228         subcall->callback2 = callback;
 229         subcall->closure = cb_closure;
 230         subcall_process(subcall, subcall_req_on_reply);
 231 }
 232
 233 static void subcall_hooked(struct subcall *subcall, void (*callback)(void*, int, struct json_object*), void *cb_closure)
 234 {
 235         subcall->callback = callback;
 236         subcall->closure = cb_closure;
 237         subcall_process(subcall, subcall_hooked_on_reply);
 238 }
 239
 240 static void subcall_req_hooked(struct subcall *subcall, void (*callback)(void*, int, struct json_object*, struct afb_req), void *cb_closure)
 241 {
 242         subcall->callback2 = callback;
 243         subcall->closure = cb_closure;
 244         subcall_process(subcall, subcall_req_hooked_on_reply);
 245 }
 246
 247 static void subcall_sync_leave(struct subcall *subcall)
 248 {
 249         struct jobloop *jobloop = __atomic_exchange_n(&subcall->jobloop, NULL, __ATOMIC_RELAXED);
 250         if (jobloop)
 251                 jobs_leave(jobloop);
 252 }
 253
 254 static void subcall_sync_reply(struct subcall *subcall, int status, struct json_object *result)
 255 {
 256         subcall->status = status;
 257         subcall->result = json_object_get(result);
 258         subcall_sync_leave(subcall);
 259 }
 260
 261 static void subcall_sync_enter(int signum, void *closure, struct jobloop *jobloop)
 262 {
 263         struct subcall *subcall = closure;
 264
 265         if (!signum) {
 266                 subcall->jobloop = jobloop;
 267                 subcall->result = NULL;
 268                 subcall->status = 0;
 269                 subcall_process(subcall, subcall_sync_reply);
 270         } else {
 271                 subcall->status = -1;
 272                 subcall_sync_leave(subcall);
 273         }
 274 }
 275
 276 static int subcallsync(struct subcall *subcall, struct json_object **result)
 277 {
 278         int rc;
 279
 280         afb_xreq_addref(&subcall->xreq);
 281         rc = jobs_enter(NULL, 0, subcall_sync_enter, subcall);
 282         *result = subcall->result;
 283         if (rc < 0 || subcall->status < 0) {
 284                 *result = *result ?: afb_msg_json_internal_error();
 285                 rc = -1;
 286         }
 287         afb_xreq_unref(&subcall->xreq);
 288         return rc;
 289 }
 290
 291 /******************************************************************************/
 292
 293 static void vinfo(void *first, void *second, const char *fmt, va_list args, void (*fun)(void*,void*,const char*))
 294 {
 295         char *info;
 296         if (fmt == NULL || vasprintf(&info, fmt, args) < 0)
 297                 info = NULL;
 298         fun(first, second, info);
 299         free(info);
 300 }
 301
 302 /******************************************************************************/
 303
 304 static struct json_object *xreq_json_cb(void *closure)
 305 {
 306         struct afb_xreq *xreq = closure;
 307         if (!xreq->json && xreq->queryitf->json)
 308                 xreq->json = xreq->queryitf->json(xreq);
 309         return xreq->json;
 310 }
 311
 312 static struct afb_arg xreq_get_cb(void *closure, const char *name)
 313 {
 314         struct afb_xreq *xreq = closure;
 315         struct afb_arg arg;
 316         struct json_object *object, *value;
 317
 318         if (xreq->queryitf->get)
 319                 arg = xreq->queryitf->get(xreq, name);
 320         else {
 321                 object = xreq_json_cb(closure);
 322                 if (json_object_object_get_ex(object, name, &value)) {
 323                         arg.name = name;
 324                         arg.value = json_object_get_string(value);
 325                 } else {
 326                         arg.name = NULL;
 327                         arg.value = NULL;
 328                 }
 329                 arg.path = NULL;
 330         }
 331         return arg;
 332 }
 333
 334 static void xreq_success_cb(void *closure, struct json_object *obj, const char *info)
 335 {
 336         struct afb_xreq *xreq = closure;
 337
 338         if (xreq->replied) {
 339                 ERROR("reply called more than one time!!");
 340                 json_object_put(obj);
 341         } else {
 342                 xreq->replied = 1;
 343                 if (xreq->queryitf->success)
 344                         xreq->queryitf->success(xreq, obj, info);
 345                 else
 346                         xreq->queryitf->reply(xreq, 0, afb_msg_json_reply_ok(info, obj, &xreq->context, NULL));
 347         }
 348 }
 349
 350 static void xreq_fail_cb(void *closure, const char *status, const char *info)
 351 {
 352         struct afb_xreq *xreq = closure;
 353
 354         if (xreq->replied) {
 355                 ERROR("reply called more than one time!!");
 356         } else {
 357                 xreq->replied = 1;
 358                 if (xreq->queryitf->fail)
 359                         xreq->queryitf->fail(xreq, status, info);
 360                 else
 361                         xreq->queryitf->reply(xreq, -1, afb_msg_json_reply_error(status, info, &xreq->context, NULL));
 362         }
 363 }
 364
 365 static void xreq_vsuccess_cb(void *closure, struct json_object *obj, const char *fmt, va_list args)
 366 {
 367         vinfo(closure, obj, fmt, args, (void*)xreq_success_cb);
 368 }
 369
 370 static void xreq_vfail_cb(void *closure, const char *status, const char *fmt, va_list args)
 371 {
 372         vinfo(closure, (void*)status, fmt, args, (void*)xreq_fail_cb);
 373 }
 374
 375 static void *xreq_context_get_cb(void *closure)
 376 {
 377         struct afb_xreq *xreq = closure;
 378         return afb_context_get(&xreq->context);
 379 }
 380
 381 static void xreq_context_set_cb(void *closure, void *value, void (*free_value)(void*))
 382 {
 383         struct afb_xreq *xreq = closure;
 384         afb_context_set(&xreq->context, value, free_value);
 385 }
 386
 387 static void xreq_addref_cb(void *closure)
 388 {
 389         struct afb_xreq *xreq = closure;
 390         xreq_addref(xreq);
 391 }
 392
 393 static void xreq_unref_cb(void *closure)
 394 {
 395         struct afb_xreq *xreq = closure;
 396         xreq_unref(xreq);
 397 }
 398
 399 static void xreq_session_close_cb(void *closure)
 400 {
 401         struct afb_xreq *xreq = closure;
 402         afb_context_close(&xreq->context);
 403 }
 404
 405 static int xreq_session_set_LOA_cb(void *closure, unsigned level)
 406 {
 407         struct afb_xreq *xreq = closure;
 408         return afb_context_change_loa(&xreq->context, level);
 409 }
 410
 411 static int xreq_subscribe_cb(void *closure, struct afb_event event)
 412 {
 413         struct afb_xreq *xreq = closure;
 414         return afb_xreq_subscribe(xreq, event);
 415 }
 416
 417 int afb_xreq_subscribe(struct afb_xreq *xreq, struct afb_event event)
 418 {
 419         if (xreq->listener)
 420                 return afb_evt_add_watch(xreq->listener, event);
 421         if (xreq->queryitf->subscribe)
 422                 return xreq->queryitf->subscribe(xreq, event);
 423         ERROR("no event listener, subscription impossible");
 424         errno = EINVAL;
 425         return -1;
 426 }
 427
 428 static int xreq_unsubscribe_cb(void *closure, struct afb_event event)
 429 {
 430         struct afb_xreq *xreq = closure;
 431         return afb_xreq_unsubscribe(xreq, event);
 432 }
 433
 434 int afb_xreq_unsubscribe(struct afb_xreq *xreq, struct afb_event event)
 435 {
 436         if (xreq->listener)
 437                 return afb_evt_remove_watch(xreq->listener, event);
 438         if (xreq->queryitf->unsubscribe)
 439                 return xreq->queryitf->unsubscribe(xreq, event);
 440         ERROR("no event listener, unsubscription impossible");
 441         errno = EINVAL;
 442         return -1;
 443 }
 444
 445 static void xreq_subcall_cb(void *closure, const char *api, const char *verb, struct json_object *args, void (*callback)(void*, int, struct json_object*), void *cb_closure)
 446 {
 447         struct afb_xreq *xreq = closure;
 448         struct subcall *sc;
 449
 450         sc = subcall_alloc(xreq, api, verb, args);
 451         if (sc == NULL) {
 452                 if (callback)
 453                         callback(cb_closure, 1, afb_msg_json_internal_error());
 454                 json_object_put(args);
 455         } else {
 456                 subcall(sc, callback, cb_closure);
 457         }
 458 }
 459
 460 static void xreq_subcall_req_cb(void *closure, const char *api, const char *verb, struct json_object *args, void (*callback)(void*, int, struct json_object*, struct afb_req), void *cb_closure)
 461 {
 462         struct afb_xreq *xreq = closure;
 463         struct subcall *sc;
 464
 465         sc = subcall_alloc(xreq, api, verb, args);
 466         if (sc == NULL) {
 467                 if (callback)
 468                         callback(cb_closure, 1, afb_msg_json_internal_error(), to_req(xreq));
 469                 json_object_put(args);
 470         } else {
 471                 subcall_req(sc, callback, cb_closure);
 472         }
 473 }
 474
 475
 476 static int xreq_subcallsync_cb(void *closure, const char *api, const char *verb, struct json_object *args, struct json_object **result)
 477 {
 478         int rc;
 479         struct subcall *sc;
 480         struct afb_xreq *xreq = closure;
 481         struct json_object *resu;
 482
 483         sc = subcall_alloc(xreq, api, verb, args);
 484         if (!sc) {
 485                 rc = -1;
 486                 resu = afb_msg_json_internal_error();
 487                 json_object_put(args);
 488         } else {
 489                 rc = subcallsync(sc, &resu);
 490         }
 491         if (result)
 492                 *result = resu;
 493         else
 494                 json_object_put(resu);
 495         return rc;
 496 }
 497
 498 static void xreq_vverbose_cb(void*closure, int level, const char *file, int line, const char *func, const char *fmt, va_list args)
 499 {
 500         char *p;
 501         struct afb_xreq *xreq = closure;
 502
 503         if (!fmt || vasprintf(&p, fmt, args) < 0)
 504                 vverbose(level, file, line, func, fmt, args);
 505         else {
 506                 verbose(level, file, line, func, "[REQ/API %s] %s", xreq->api, p);
 507                 free(p);
 508         }
 509 }
 510
 511 static struct afb_stored_req *xreq_store_cb(void *closure)
 512 {
 513         xreq_addref_cb(closure);
 514         return closure;
 515 }
 516
 517 static int xreq_has_permission_cb(void*closure, const char *permission)
 518 {
 519         struct afb_xreq *xreq = closure;
 520         return afb_auth_has_permission(xreq, permission);
 521 }
 522
 523 static char *xreq_get_application_id_cb(void*closure)
 524 {
 525         struct afb_xreq *xreq = closure;
 526         return xreq->cred && xreq->cred->id ? strdup(xreq->cred->id) : NULL;
 527 }
 528
 529 /******************************************************************************/
 530
 531 static struct json_object *xreq_hooked_json_cb(void *closure)
 532 {
 533         struct json_object *r = xreq_json_cb(closure);
 534         struct afb_xreq *xreq = closure;
 535         return afb_hook_xreq_json(xreq, r);
 536 }
 537
 538 static struct afb_arg xreq_hooked_get_cb(void *closure, const char *name)
 539 {
 540         struct afb_arg r = xreq_get_cb(closure, name);
 541         struct afb_xreq *xreq = closure;
 542         return afb_hook_xreq_get(xreq, name, r);
 543 }
 544
 545 static void xreq_hooked_success_cb(void *closure, struct json_object *obj, const char *info)
 546 {
 547         struct afb_xreq *xreq = closure;
 548         afb_hook_xreq_success(xreq, obj, info);
 549         xreq_success_cb(closure, obj, info);
 550 }
 551
 552 static void xreq_hooked_fail_cb(void *closure, const char *status, const char *info)
 553 {
 554         struct afb_xreq *xreq = closure;
 555         afb_hook_xreq_fail(xreq, status, info);
 556         xreq_fail_cb(closure, status, info);
 557 }
 558
 559 static void xreq_hooked_vsuccess_cb(void *closure, struct json_object *obj, const char *fmt, va_list args)
 560 {
 561         vinfo(closure, obj, fmt, args, (void*)xreq_hooked_success_cb);
 562 }
 563
 564 static void xreq_hooked_vfail_cb(void *closure, const char *status, const char *fmt, va_list args)
 565 {
 566         vinfo(closure, (void*)status, fmt, args, (void*)xreq_hooked_fail_cb);
 567 }
 568
 569 static void *xreq_hooked_context_get_cb(void *closure)
 570 {
 571         void *r = xreq_context_get_cb(closure);
 572         struct afb_xreq *xreq = closure;
 573         return afb_hook_xreq_context_get(xreq, r);
 574 }
 575
 576 static void xreq_hooked_context_set_cb(void *closure, void *value, void (*free_value)(void*))
 577 {
 578         struct afb_xreq *xreq = closure;
 579         afb_hook_xreq_context_set(xreq, value, free_value);
 580         xreq_context_set_cb(closure, value, free_value);
 581 }
 582
 583 static void xreq_hooked_addref_cb(void *closure)
 584 {
 585         struct afb_xreq *xreq = closure;
 586         afb_hook_xreq_addref(xreq);
 587         xreq_addref_cb(closure);
 588 }
 589
 590 static void xreq_hooked_unref_cb(void *closure)
 591 {
 592         struct afb_xreq *xreq = closure;
 593         afb_hook_xreq_unref(xreq);
 594         xreq_unref_cb(closure);
 595 }
 596
 597 static void xreq_hooked_session_close_cb(void *closure)
 598 {
 599         struct afb_xreq *xreq = closure;
 600         afb_hook_xreq_session_close(xreq);
 601         xreq_session_close_cb(closure);
 602 }
 603
 604 static int xreq_hooked_session_set_LOA_cb(void *closure, unsigned level)
 605 {
 606         int r = xreq_session_set_LOA_cb(closure, level);
 607         struct afb_xreq *xreq = closure;
 608         return afb_hook_xreq_session_set_LOA(xreq, level, r);
 609 }
 610
 611 static int xreq_hooked_subscribe_cb(void *closure, struct afb_event event)
 612 {
 613         int r = xreq_subscribe_cb(closure, event);
 614         struct afb_xreq *xreq = closure;
 615         return afb_hook_xreq_subscribe(xreq, event, r);
 616 }
 617
 618 static int xreq_hooked_unsubscribe_cb(void *closure, struct afb_event event)
 619 {
 620         int r = xreq_unsubscribe_cb(closure, event);
 621         struct afb_xreq *xreq = closure;
 622         return afb_hook_xreq_unsubscribe(xreq, event, r);
 623 }
 624
 625 static void xreq_hooked_subcall_cb(void *closure, const char *api, const char *verb, struct json_object *args, void (*callback)(void*, int, struct json_object*), void *cb_closure)
 626 {
 627         struct afb_xreq *xreq = closure;
 628         struct subcall *sc;
 629
 630         afb_hook_xreq_subcall(xreq, api, verb, args);
 631         sc = subcall_alloc(xreq, api, verb, args);
 632         if (sc == NULL) {
 633                 if (callback)
 634                         callback(cb_closure, 1, afb_msg_json_internal_error());
 635                 json_object_put(args);
 636         } else {
 637                 subcall_hooked(sc, callback, cb_closure);
 638         }
 639 }
 640
 641 static void xreq_hooked_subcall_req_cb(void *closure, const char *api, const char *verb, struct json_object *args, void (*callback)(void*, int, struct json_object*, struct afb_req), void *cb_closure)
 642 {
 643         struct afb_xreq *xreq = closure;
 644         struct subcall *sc;
 645
 646         afb_hook_xreq_subcall_req(xreq, api, verb, args);
 647         sc = subcall_alloc(xreq, api, verb, args);
 648         if (sc == NULL) {
 649                 if (callback)
 650                         callback(cb_closure, 1, afb_msg_json_internal_error(), to_req(xreq));
 651                 json_object_put(args);
 652         } else {
 653                 subcall_req_hooked(sc, callback, cb_closure);
 654         }
 655 }
 656
 657 static int xreq_hooked_subcallsync_cb(void *closure, const char *api, const char *verb, struct json_object *args, struct json_object **result)
 658 {
 659         int r;
 660         struct afb_xreq *xreq = closure;
 661         afb_hook_xreq_subcallsync(xreq, api, verb, args);
 662         r = xreq_subcallsync_cb(closure, api, verb, args, result);
 663         return afb_hook_xreq_subcallsync_result(xreq, r, *result);
 664 }
 665
 666 static void xreq_hooked_vverbose_cb(void*closure, int level, const char *file, int line, const char *func, const char *fmt, va_list args)
 667 {
 668         struct afb_xreq *xreq = closure;
 669         va_list ap;
 670         va_copy(ap, args);
 671         xreq_vverbose_cb(closure, level, file, line, func, fmt, args);
 672         afb_hook_xreq_vverbose(xreq, level, file, line, func, fmt, ap);
 673         va_end(ap);
 674 }
 675
 676 static struct afb_stored_req *xreq_hooked_store_cb(void *closure)
 677 {
 678         struct afb_xreq *xreq = closure;
 679         struct afb_stored_req *r = xreq_store_cb(closure);
 680         afb_hook_xreq_store(xreq, r);
 681         return r;
 682 }
 683
 684 static int xreq_hooked_has_permission_cb(void*closure, const char *permission)
 685 {
 686         struct afb_xreq *xreq = closure;
 687         int r = xreq_has_permission_cb(closure, permission);
 688         return afb_hook_xreq_has_permission(xreq, permission, r);
 689 }
 690
 691 static char *xreq_hooked_get_application_id_cb(void*closure)
 692 {
 693         struct afb_xreq *xreq = closure;
 694         char *r = xreq_get_application_id_cb(closure);
 695         return afb_hook_xreq_get_application_id(xreq, r);
 696 }
 697
 698 /******************************************************************************/
 699
 700 const struct afb_req_itf xreq_itf = {
 701         .json = xreq_json_cb,
 702         .get = xreq_get_cb,
 703         .success = xreq_success_cb,
 704         .fail = xreq_fail_cb,
 705         .vsuccess = xreq_vsuccess_cb,
 706         .vfail = xreq_vfail_cb,
 707         .context_get = xreq_context_get_cb,
 708         .context_set = xreq_context_set_cb,
 709         .addref = xreq_addref_cb,
 710         .unref = xreq_unref_cb,
 711         .session_close = xreq_session_close_cb,
 712         .session_set_LOA = xreq_session_set_LOA_cb,
 713         .subscribe = xreq_subscribe_cb,
 714         .unsubscribe = xreq_unsubscribe_cb,
 715         .subcall = xreq_subcall_cb,
 716         .subcallsync = xreq_subcallsync_cb,
 717         .vverbose = xreq_vverbose_cb,
 718         .store = xreq_store_cb,
 719         .subcall_req = xreq_subcall_req_cb,
 720         .has_permission = xreq_has_permission_cb,
 721         .get_application_id = xreq_get_application_id_cb
 722 };
 723
 724 const struct afb_req_itf xreq_hooked_itf = {
 725         .json = xreq_hooked_json_cb,
 726         .get = xreq_hooked_get_cb,
 727         .success = xreq_hooked_success_cb,
 728         .fail = xreq_hooked_fail_cb,
 729         .vsuccess = xreq_hooked_vsuccess_cb,
 730         .vfail = xreq_hooked_vfail_cb,
 731         .context_get = xreq_hooked_context_get_cb,
 732         .context_set = xreq_hooked_context_set_cb,
 733         .addref = xreq_hooked_addref_cb,
 734         .unref = xreq_hooked_unref_cb,
 735         .session_close = xreq_hooked_session_close_cb,
 736         .session_set_LOA = xreq_hooked_session_set_LOA_cb,
 737         .subscribe = xreq_hooked_subscribe_cb,
 738         .unsubscribe = xreq_hooked_unsubscribe_cb,
 739         .subcall = xreq_hooked_subcall_cb,
 740         .subcallsync = xreq_hooked_subcallsync_cb,
 741         .vverbose = xreq_hooked_vverbose_cb,
 742         .store = xreq_hooked_store_cb,
 743         .subcall_req = xreq_hooked_subcall_req_cb,
 744         .has_permission = xreq_hooked_has_permission_cb,
 745         .get_application_id = xreq_hooked_get_application_id_cb
 746 };
 747
 748 /******************************************************************************/
 749
 750 struct afb_req afb_xreq_unstore(struct afb_stored_req *sreq)
 751 {
 752         struct afb_xreq *xreq = (struct afb_xreq *)sreq;
 753         if (xreq->hookflags)
 754                 afb_hook_xreq_unstore(xreq);
 755         return to_req(xreq);
 756 }
 757
 758 struct json_object *afb_xreq_json(struct afb_xreq *xreq)
 759 {
 760         return afb_req_json(to_req(xreq));
 761 }
 762
 763 void afb_xreq_success(struct afb_xreq *xreq, struct json_object *obj, const char *info)
 764 {
 765         afb_req_success(to_req(xreq), obj, info);
 766 }
 767
 768 void afb_xreq_success_f(struct afb_xreq *xreq, struct json_object *obj, const char *info, ...)
 769 {
 770         va_list args;
 771
 772         va_start(args, info);
 773         afb_req_success_v(to_req(xreq), obj, info, args);
 774         va_end(args);
 775 }
 776
 777 void afb_xreq_fail(struct afb_xreq *xreq, const char *status, const char *info)
 778 {
 779         afb_req_fail(to_req(xreq), status, info);
 780 }
 781
 782 void afb_xreq_fail_f(struct afb_xreq *xreq, const char *status, const char *info, ...)
 783 {
 784         va_list args;
 785
 786         va_start(args, info);
 787         afb_req_fail_v(to_req(xreq), status, info, args);
 788         va_end(args);
 789
 790 }
 791
 792 const char *afb_xreq_raw(struct afb_xreq *xreq, size_t *size)
 793 {
 794         struct json_object *obj = xreq_json_cb(xreq);
 795         const char *result = json_object_to_json_string(obj);
 796         if (size != NULL)
 797                 *size = strlen(result);
 798         return result;
 799 }
 800
 801 void afb_xreq_addref(struct afb_xreq *xreq)
 802 {
 803         afb_req_addref(to_req(xreq));
 804 }
 805
 806 void afb_xreq_unref(struct afb_xreq *xreq)
 807 {
 808         afb_req_unref(to_req(xreq));
 809 }
 810
 811 void afb_xreq_unhooked_subcall(struct afb_xreq *xreq, const char *api, const char *verb, struct json_object *args, void (*callback)(void*, int, struct json_object*), void *cb_closure)
 812 {
 813         xreq_subcall_cb(xreq, api, verb, args, callback, cb_closure);
 814 }
 815
 816 void afb_xreq_subcall(struct afb_xreq *xreq, const char *api, const char *verb, struct json_object *args, void (*callback)(void*, int, struct json_object*), void *cb_closure)
 817 {
 818         afb_req_subcall(to_req(xreq), api, verb, args, callback, cb_closure);
 819 }
 820
 821 int afb_xreq_unhooked_subcall_sync(struct afb_xreq *xreq, const char *api, const char *verb, struct json_object *args, struct json_object **result)
 822 {
 823         return xreq_subcallsync_cb(xreq, api, verb, args, result);
 824 }
 825
 826 int afb_xreq_subcall_sync(struct afb_xreq *xreq, const char *api, const char *verb, struct json_object *args, struct json_object **result)
 827 {
 828         return afb_req_subcall_sync(to_req(xreq), api, verb, args, result);
 829 }
 830
 831 static int xreq_session_check_apply_v1(struct afb_xreq *xreq, int sessionflags)
 832 {
 833         int loa;
 834
 835         if ((sessionflags & (AFB_SESSION_CLOSE_V1|AFB_SESSION_RENEW_V1|AFB_SESSION_CHECK_V1|AFB_SESSION_LOA_EQ_V1)) != 0) {
 836                 if (!afb_context_check(&xreq->context)) {
 837                         afb_context_close(&xreq->context);
 838                         afb_xreq_fail_f(xreq, "denied", "invalid token's identity");
 839                         errno = EINVAL;
 840                         return -1;
 841                 }
 842         }
 843
 844         if ((sessionflags & AFB_SESSION_LOA_GE_V1) != 0) {
 845                 loa = (sessionflags >> AFB_SESSION_LOA_SHIFT_V1) & AFB_SESSION_LOA_MASK_V1;
 846                 if (!afb_context_check_loa(&xreq->context, loa)) {
 847                         afb_xreq_fail_f(xreq, "denied", "invalid LOA");
 848                         errno = EPERM;
 849                         return -1;
 850                 }
 851         }
 852
 853         if ((sessionflags & AFB_SESSION_LOA_LE_V1) != 0) {
 854                 loa = (sessionflags >> AFB_SESSION_LOA_SHIFT_V1) & AFB_SESSION_LOA_MASK_V1;
 855                 if (afb_context_check_loa(&xreq->context, loa + 1)) {
 856                         afb_xreq_fail_f(xreq, "denied", "invalid LOA");
 857                         errno = EPERM;
 858                         return -1;
 859                 }
 860         }
 861
 862         if ((sessionflags & AFB_SESSION_RENEW_V1) != 0) {
 863                 afb_context_refresh(&xreq->context);
 864         }
 865         if ((sessionflags & AFB_SESSION_CLOSE_V1) != 0) {
 866                 afb_context_change_loa(&xreq->context, 0);
 867                 afb_context_close(&xreq->context);
 868         }
 869
 870         return 0;
 871 }
 872
 873 static int xreq_session_check_apply_v2(struct afb_xreq *xreq, uint32_t sessionflags, const struct afb_auth *auth)
 874 {
 875         int loa;
 876
 877         if (sessionflags != 0) {
 878                 if (!afb_context_check(&xreq->context)) {
 879                         afb_context_close(&xreq->context);
 880                         afb_xreq_fail_f(xreq, "denied", "invalid token's identity");
 881                         errno = EINVAL;
 882                         return -1;
 883                 }
 884         }
 885
 886         loa = (int)(sessionflags & AFB_SESSION_LOA_MASK_V2);
 887         if (loa && !afb_context_check_loa(&xreq->context, loa)) {
 888                 afb_xreq_fail_f(xreq, "denied", "invalid LOA");
 889                 errno = EPERM;
 890                 return -1;
 891         }
 892
 893         if (auth && !afb_auth_check(xreq, auth)) {
 894                 afb_xreq_fail_f(xreq, "denied", "authorisation refused");
 895                 errno = EPERM;
 896                 return -1;
 897         }
 898
 899         if ((sessionflags & AFB_SESSION_REFRESH_V2) != 0) {
 900                 afb_context_refresh(&xreq->context);
 901         }
 902         if ((sessionflags & AFB_SESSION_CLOSE_V2) != 0) {
 903                 afb_context_close(&xreq->context);
 904         }
 905
 906         return 0;
 907 }
 908
 909 void afb_xreq_call_verb_v1(struct afb_xreq *xreq, const struct afb_verb_desc_v1 *verb)
 910 {
 911         if (!verb)
 912                 afb_xreq_fail_unknown_verb(xreq);
 913         else
 914                 if (!xreq_session_check_apply_v1(xreq, verb->session))
 915                         verb->callback(to_req(xreq));
 916 }
 917
 918 void afb_xreq_call_verb_v2(struct afb_xreq *xreq, const struct afb_verb_v2 *verb)
 919 {
 920         if (!verb)
 921                 afb_xreq_fail_unknown_verb(xreq);
 922         else
 923                 if (!xreq_session_check_apply_v2(xreq, verb->session, verb->auth))
 924                         verb->callback(to_req(xreq));
 925 }
 926
 927 void afb_xreq_init(struct afb_xreq *xreq, const struct afb_xreq_query_itf *queryitf)
 928 {
 929         memset(xreq, 0, sizeof *xreq);
 930         xreq->refcount = 1;
 931         xreq->queryitf = queryitf;
 932 }
 933
 934 void afb_xreq_fail_unknown_api(struct afb_xreq *xreq)
 935 {
 936         afb_xreq_fail_f(xreq, "unknown-api", "api %s not found (for verb %s)", xreq->api, xreq->verb);
 937 }
 938
 939 void afb_xreq_fail_unknown_verb(struct afb_xreq *xreq)
 940 {
 941         afb_xreq_fail_f(xreq, "unknown-verb", "verb %s unknown within api %s", xreq->verb, xreq->api);
 942 }
 943
 944 static void init_hooking(struct afb_xreq *xreq)
 945 {
 946         afb_hook_init_xreq(xreq);
 947         if (xreq->hookflags)
 948                 afb_hook_xreq_begin(xreq);
 949 }
 950
 951 /**
 952  * job callback for asynchronous and secured processing of the request.
 953  */
 954 static void process_async(int signum, void *arg)
 955 {
 956         struct afb_xreq *xreq = arg;
 957         const struct afb_api *api;
 958
 959         if (signum != 0) {
 960                 /* emit the error (assumes that hooking is initialised) */
 961                 afb_xreq_fail_f(xreq, "aborted", "signal %s(%d) caught", strsignal(signum), signum);
 962         } else {
 963                 /* init hooking */
 964                 init_hooking(xreq);
 965                 /* invoke api call method to process the reqiest */
 966                 api = (const struct afb_api*)xreq->context.api_key;
 967                 api->itf->call(api->closure, xreq);
 968         }
 969         /* release the request */
 970         xreq_unref(xreq);
 971 }
 972
 973 /**
 974  * Early request failure of the request 'xreq' with, as usual, 'status' and 'info'
 975  * The early failure occurs only in function 'afb_xreq_process' where normally,
 976  * the hooking is not initialised. So this "early" failure takes care to initialise
 977  * the hooking in first.
 978  */
 979 static void early_failure(struct afb_xreq *xreq, const char *status, const char *info, ...)
 980 {
 981         va_list args;
 982
 983         /* init hooking */
 984         init_hooking(xreq);
 985
 986         /* send error */
 987         va_start(args, info);
 988         afb_req_fail_v(to_req(xreq), status, info, args);
 989         va_end(args);
 990 }
 991
 992 /**
 993  * Enqueue a job for processing the request 'xreq' using the given 'apiset'.
 994  * Errors are reported as request failures.
 995  */
 996 void afb_xreq_process(struct afb_xreq *xreq, struct afb_apiset *apiset)
 997 {
 998         const struct afb_api *api;
 999         struct afb_xreq *caller;
1000
1001         /* lookup at the api */
1002         xreq->apiset = apiset;
1003         api = afb_apiset_lookup_started(apiset, xreq->api, 1);
1004         if (!api) {
1005                 if (errno == ENOENT)
1006                         early_failure(xreq, "unknown-api", "api %s not found (for verb %s)", xreq->api, xreq->verb);
1007                 else
1008                         early_failure(xreq, "bad-api-state", "api %s not started correctly: %m", xreq->api);
1009                 goto end;
1010         }
1011         xreq->context.api_key = api;
1012
1013         /* check self locking */
1014         if (!api->noconcurrency)
1015                 api = NULL;
1016         else {
1017                 caller = xreq->caller;
1018                 while (caller) {
1019                         if (caller->context.api_key == api) {
1020                                 /* noconcurrency lock detected */
1021                                 ERROR("self-lock detected in call stack for API %s", xreq->api);
1022                                 early_failure(xreq, "self-locked", "recursive self lock, API %s", xreq->api);
1023                                 goto end;
1024                         }
1025                         caller = caller->caller;
1026                 }
1027         }
1028
1029         /* queue the request job */
1030         xreq_addref(xreq);
1031         if (jobs_queue(api, afb_apiset_timeout_get(apiset), process_async, xreq) < 0) {
1032                 /* TODO: allows or not to proccess it directly as when no threading? (see above) */
1033                 ERROR("can't process job with threads: %m");
1034                 early_failure(xreq, "cancelled", "not able to create a job for the task");
1035                 xreq_unref(xreq);
1036         }
1037 end:
1038         xreq_unref(xreq);
1039 }
1040