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 #include <afb/afb-request.h>
  29
  30 #include "afb-context.h"
  31 #include "afb-xreq.h"
  32 #include "afb-evt.h"
  33 #include "afb-msg-json.h"
  34 #include "afb-cred.h"
  35 #include "afb-hook.h"
  36 #include "afb-api.h"
  37 #include "afb-apiset.h"
  38 #include "afb-auth.h"
  39 #include "jobs.h"
  40 #include "verbose.h"
  41
  42 /******************************************************************************/
  43
  44 static void xreq_finalize(struct afb_xreq *xreq)
  45 {
  46         if (!xreq->replied)
  47                 afb_xreq_fail(xreq, "error", "no reply");
  48         if (xreq->hookflags)
  49                 afb_hook_xreq_end(xreq);
  50         if (xreq->caller)
  51                 afb_xreq_unhooked_unref(xreq->caller);
  52         xreq->queryitf->unref(xreq);
  53 }
  54
  55 inline void afb_xreq_unhooked_addref(struct afb_xreq *xreq)
  56 {
  57         __atomic_add_fetch(&xreq->refcount, 1, __ATOMIC_RELAXED);
  58 }
  59
  60 inline void afb_xreq_unhooked_unref(struct afb_xreq *xreq)
  61 {
  62         if (!__atomic_sub_fetch(&xreq->refcount, 1, __ATOMIC_RELAXED))
  63                 xreq_finalize(xreq);
  64 }
  65
  66 /******************************************************************************/
  67
  68 static inline struct afb_request *to_request(struct afb_xreq *xreq)
  69 {
  70         return &xreq->request;
  71 }
  72
  73 static inline struct afb_req to_req(struct afb_xreq *xreq)
  74 {
  75         return (struct afb_req){ .itf = xreq->request.itf, .closure = &xreq->request };
  76 }
  77
  78 static inline struct afb_xreq *from_request(struct afb_request *request)
  79 {
  80         return CONTAINER_OF(struct afb_xreq, request, request);
  81 }
  82
  83 /******************************************************************************/
  84
  85 struct subcall
  86 {
  87         struct afb_xreq xreq;
  88
  89         void (*completion)(struct subcall*, int, struct json_object*);
  90
  91         union {
  92                 struct {
  93                         struct jobloop *jobloop;
  94                         struct json_object *result;
  95                         int status;
  96                 };
  97                 struct {
  98                         union {
  99                                 void (*callback)(void*, int, struct json_object*);
 100                                 void (*callback2)(void*, int, struct json_object*, struct afb_req);
 101                         };
 102                         void *closure;
 103                 };
 104         };
 105 };
 106
 107 static int subcall_subscribe_cb(struct afb_xreq *xreq, struct afb_eventid *eventid)
 108 {
 109         struct subcall *subcall = CONTAINER_OF_XREQ(struct subcall, xreq);
 110
 111         return afb_xreq_subscribe(subcall->xreq.caller, eventid);
 112 }
 113
 114 static int subcall_unsubscribe_cb(struct afb_xreq *xreq, struct afb_eventid *eventid)
 115 {
 116         struct subcall *subcall = CONTAINER_OF_XREQ(struct subcall, xreq);
 117
 118         return afb_xreq_unsubscribe(subcall->xreq.caller, eventid);
 119 }
 120
 121 static void subcall_reply_cb(struct afb_xreq *xreq, int status, struct json_object *result)
 122 {
 123         struct subcall *subcall = CONTAINER_OF_XREQ(struct subcall, xreq);
 124
 125         subcall->completion(subcall, status, result);
 126         json_object_put(result);
 127         afb_xreq_unhooked_unref(&subcall->xreq);
 128 }
 129
 130 static void subcall_destroy_cb(struct afb_xreq *xreq)
 131 {
 132         struct subcall *subcall = CONTAINER_OF_XREQ(struct subcall, xreq);
 133
 134         json_object_put(subcall->xreq.json);
 135         afb_cred_unref(subcall->xreq.cred);
 136         free(subcall);
 137 }
 138
 139 const struct afb_xreq_query_itf afb_xreq_subcall_itf = {
 140         .reply = subcall_reply_cb,
 141         .unref = subcall_destroy_cb,
 142         .subscribe = subcall_subscribe_cb,
 143         .unsubscribe = subcall_unsubscribe_cb
 144 };
 145
 146 static struct subcall *subcall_alloc(
 147                 struct afb_xreq *caller,
 148                 const char *api,
 149                 const char *verb,
 150                 struct json_object *args
 151 )
 152 {
 153         struct subcall *subcall;
 154         size_t lenapi, lenverb;
 155         char *copy;
 156
 157         lenapi = 1 + strlen(api);
 158         lenverb = 1 + strlen(verb);
 159         subcall = malloc(lenapi + lenverb + sizeof *subcall);
 160         if (!subcall)
 161                 ERROR("out of memory");
 162         else {
 163                 copy = (char*)&subcall[1];
 164                 memcpy(copy, api, lenapi);
 165                 api = copy;
 166                 copy = &copy[lenapi];
 167                 memcpy(copy, verb, lenverb);
 168                 verb = copy;
 169
 170                 afb_xreq_init(&subcall->xreq, &afb_xreq_subcall_itf);
 171                 afb_context_subinit(&subcall->xreq.context, &caller->context);
 172                 subcall->xreq.cred = afb_cred_addref(caller->cred);
 173                 subcall->xreq.json = args;
 174                 subcall->xreq.api = api;
 175                 subcall->xreq.verb = verb;
 176                 subcall->xreq.caller = caller;
 177                 afb_xreq_unhooked_addref(caller);
 178         }
 179         return subcall;
 180 }
 181
 182
 183 static void subcall_on_reply(struct subcall *subcall, int status, struct json_object *result)
 184 {
 185         subcall->callback(subcall->closure, status, result);
 186 }
 187
 188 static void subcall_req_on_reply(struct subcall *subcall, int status, struct json_object *result)
 189 {
 190         subcall->callback2(subcall->closure, status, result, to_req(subcall->xreq.caller));
 191 }
 192
 193 static void subcall_hooked_on_reply(struct subcall *subcall, int status, struct json_object *result)
 194 {
 195         afb_hook_xreq_subcall_result(subcall->xreq.caller, status, result);
 196         subcall_on_reply(subcall, status, result);
 197 }
 198
 199 static void subcall_req_hooked_on_reply(struct subcall *subcall, int status, struct json_object *result)
 200 {
 201         afb_hook_xreq_subcall_req_result(subcall->xreq.caller, status, result);
 202         subcall_req_on_reply(subcall, status, result);
 203 }
 204
 205 static void subcall_reply_direct_cb(void *closure, int status, struct json_object *result)
 206 {
 207         struct afb_xreq *xreq = closure;
 208
 209         if (xreq->replied) {
 210                 ERROR("subcall replied more than one time!!");
 211                 json_object_put(result);
 212         } else {
 213                 xreq->replied = 1;
 214                 subcall_reply_cb(xreq, status, result);
 215         }
 216 }
 217
 218 static void subcall_process(struct subcall *subcall, void (*completion)(struct subcall*, int, struct json_object*))
 219 {
 220         subcall->completion = completion;
 221         if (subcall->xreq.caller->queryitf->subcall) {
 222                 subcall->xreq.caller->queryitf->subcall(
 223                         subcall->xreq.caller, subcall->xreq.api, subcall->xreq.verb,
 224                         subcall->xreq.json, subcall_reply_direct_cb, &subcall->xreq);
 225         } else {
 226                 afb_xreq_unhooked_addref(&subcall->xreq);
 227                 afb_xreq_process(&subcall->xreq, subcall->xreq.caller->apiset);
 228         }
 229 }
 230
 231 static void subcall(struct subcall *subcall, void (*callback)(void*, int, struct json_object*), void *cb_closure)
 232 {
 233         subcall->callback = callback;
 234         subcall->closure = cb_closure;
 235         subcall_process(subcall, subcall_on_reply);
 236 }
 237
 238 static void subcall_req(struct subcall *subcall, void (*callback)(void*, int, struct json_object*, struct afb_req), void *cb_closure)
 239 {
 240         subcall->callback2 = callback;
 241         subcall->closure = cb_closure;
 242         subcall_process(subcall, subcall_req_on_reply);
 243 }
 244
 245 static void subcall_hooked(struct subcall *subcall, void (*callback)(void*, int, struct json_object*), void *cb_closure)
 246 {
 247         subcall->callback = callback;
 248         subcall->closure = cb_closure;
 249         subcall_process(subcall, subcall_hooked_on_reply);
 250 }
 251
 252 static void subcall_req_hooked(struct subcall *subcall, void (*callback)(void*, int, struct json_object*, struct afb_req), void *cb_closure)
 253 {
 254         subcall->callback2 = callback;
 255         subcall->closure = cb_closure;
 256         subcall_process(subcall, subcall_req_hooked_on_reply);
 257 }
 258
 259 static void subcall_sync_leave(struct subcall *subcall)
 260 {
 261         struct jobloop *jobloop = __atomic_exchange_n(&subcall->jobloop, NULL, __ATOMIC_RELAXED);
 262         if (jobloop)
 263                 jobs_leave(jobloop);
 264 }
 265
 266 static void subcall_sync_reply(struct subcall *subcall, int status, struct json_object *result)
 267 {
 268         subcall->status = status;
 269         subcall->result = json_object_get(result);
 270         subcall_sync_leave(subcall);
 271 }
 272
 273 static void subcall_sync_enter(int signum, void *closure, struct jobloop *jobloop)
 274 {
 275         struct subcall *subcall = closure;
 276
 277         if (!signum) {
 278                 subcall->jobloop = jobloop;
 279                 subcall->result = NULL;
 280                 subcall->status = 0;
 281                 subcall_process(subcall, subcall_sync_reply);
 282         } else {
 283                 subcall->status = -1;
 284                 subcall_sync_leave(subcall);
 285         }
 286 }
 287
 288 static int subcallsync(struct subcall *subcall, struct json_object **result)
 289 {
 290         int rc;
 291
 292         afb_xreq_unhooked_addref(&subcall->xreq);
 293         rc = jobs_enter(NULL, 0, subcall_sync_enter, subcall);
 294         *result = subcall->result;
 295         if (rc < 0 || subcall->status < 0) {
 296                 *result = *result ?: afb_msg_json_internal_error();
 297                 rc = -1;
 298         }
 299         afb_xreq_unhooked_unref(&subcall->xreq);
 300         return rc;
 301 }
 302
 303 /******************************************************************************/
 304
 305 static void vinfo(void *first, void *second, const char *fmt, va_list args, void (*fun)(void*,void*,const char*))
 306 {
 307         char *info;
 308         if (fmt == NULL || vasprintf(&info, fmt, args) < 0)
 309                 info = NULL;
 310         fun(first, second, info);
 311         free(info);
 312 }
 313
 314 /******************************************************************************/
 315
 316 static struct json_object *xreq_json_cb(struct afb_request *closure)
 317 {
 318         struct afb_xreq *xreq = from_request(closure);
 319         if (!xreq->json && xreq->queryitf->json)
 320                 xreq->json = xreq->queryitf->json(xreq);
 321         return xreq->json;
 322 }
 323
 324 static struct afb_arg xreq_get_cb(struct afb_request *closure, const char *name)
 325 {
 326         struct afb_xreq *xreq = from_request(closure);
 327         struct afb_arg arg;
 328         struct json_object *object, *value;
 329
 330         if (xreq->queryitf->get)
 331                 arg = xreq->queryitf->get(xreq, name);
 332         else {
 333                 object = xreq_json_cb(closure);
 334                 if (json_object_object_get_ex(object, name, &value)) {
 335                         arg.name = name;
 336                         arg.value = json_object_get_string(value);
 337                 } else {
 338                         arg.name = NULL;
 339                         arg.value = NULL;
 340                 }
 341                 arg.path = NULL;
 342         }
 343         return arg;
 344 }
 345
 346 static void xreq_success_cb(struct afb_request *closure, struct json_object *obj, const char *info)
 347 {
 348         struct afb_xreq *xreq = from_request(closure);
 349
 350         if (xreq->replied) {
 351                 ERROR("reply called more than one time!!");
 352                 json_object_put(obj);
 353         } else {
 354                 xreq->replied = 1;
 355                 if (xreq->queryitf->success)
 356                         xreq->queryitf->success(xreq, obj, info);
 357                 else
 358                         xreq->queryitf->reply(xreq, 0, afb_msg_json_reply_ok(info, obj, &xreq->context, NULL));
 359         }
 360 }
 361
 362 static void xreq_fail_cb(struct afb_request *closure, const char *status, const char *info)
 363 {
 364         struct afb_xreq *xreq = from_request(closure);
 365
 366         if (xreq->replied) {
 367                 ERROR("reply called more than one time!!");
 368         } else {
 369                 xreq->replied = 1;
 370                 if (xreq->queryitf->fail)
 371                         xreq->queryitf->fail(xreq, status, info);
 372                 else
 373                         xreq->queryitf->reply(xreq, -1, afb_msg_json_reply_error(status, info, &xreq->context, NULL));
 374         }
 375 }
 376
 377 static void xreq_vsuccess_cb(struct afb_request *closure, struct json_object *obj, const char *fmt, va_list args)
 378 {
 379         vinfo(closure, obj, fmt, args, (void*)xreq_success_cb);
 380 }
 381
 382 static void xreq_vfail_cb(struct afb_request *closure, const char *status, const char *fmt, va_list args)
 383 {
 384         vinfo(closure, (void*)status, fmt, args, (void*)xreq_fail_cb);
 385 }
 386
 387 static void *xreq_context_get_cb(struct afb_request *closure)
 388 {
 389         struct afb_xreq *xreq = from_request(closure);
 390         return afb_context_get(&xreq->context);
 391 }
 392
 393 static void xreq_context_set_cb(struct afb_request *closure, void *value, void (*free_value)(void*))
 394 {
 395         struct afb_xreq *xreq = from_request(closure);
 396         afb_context_set(&xreq->context, value, free_value);
 397 }
 398
 399 static void xreq_addref_cb(struct afb_request *closure)
 400 {
 401         struct afb_xreq *xreq = from_request(closure);
 402         afb_xreq_unhooked_addref(xreq);
 403 }
 404
 405 static void xreq_unref_cb(struct afb_request *closure)
 406 {
 407         struct afb_xreq *xreq = from_request(closure);
 408         afb_xreq_unhooked_unref(xreq);
 409 }
 410
 411 static void xreq_session_close_cb(struct afb_request *closure)
 412 {
 413         struct afb_xreq *xreq = from_request(closure);
 414         afb_context_close(&xreq->context);
 415 }
 416
 417 static int xreq_session_set_LOA_cb(struct afb_request *closure, unsigned level)
 418 {
 419         struct afb_xreq *xreq = from_request(closure);
 420         return afb_context_change_loa(&xreq->context, level);
 421 }
 422
 423 static int xreq_subscribe_eventid_cb(struct afb_request *closure, struct afb_eventid *eventid);
 424 static int xreq_subscribe_cb(struct afb_request *closure, struct afb_event event)
 425 {
 426         return xreq_subscribe_eventid_cb(closure, event.closure);
 427 }
 428
 429 static int xreq_subscribe_eventid_cb(struct afb_request *closure, struct afb_eventid *eventid)
 430 {
 431         struct afb_xreq *xreq = from_request(closure);
 432         return afb_xreq_subscribe(xreq, eventid);
 433 }
 434
 435 int afb_xreq_subscribe(struct afb_xreq *xreq, struct afb_eventid *eventid)
 436 {
 437         if (xreq->listener)
 438                 return afb_evt_add_watch(xreq->listener, eventid);
 439         if (xreq->queryitf->subscribe)
 440                 return xreq->queryitf->subscribe(xreq, eventid);
 441         ERROR("no event listener, subscription impossible");
 442         errno = EINVAL;
 443         return -1;
 444 }
 445
 446 static int xreq_unsubscribe_eventid_cb(struct afb_request *closure, struct afb_eventid *eventid);
 447 static int xreq_unsubscribe_cb(struct afb_request *closure, struct afb_event event)
 448 {
 449         return xreq_unsubscribe_eventid_cb(closure, event.closure);
 450 }
 451
 452 static int xreq_unsubscribe_eventid_cb(struct afb_request *closure, struct afb_eventid *eventid)
 453 {
 454         struct afb_xreq *xreq = from_request(closure);
 455         return afb_xreq_unsubscribe(xreq, eventid);
 456 }
 457
 458 int afb_xreq_unsubscribe(struct afb_xreq *xreq, struct afb_eventid *eventid)
 459 {
 460         if (xreq->listener)
 461                 return afb_evt_remove_watch(xreq->listener, eventid);
 462         if (xreq->queryitf->unsubscribe)
 463                 return xreq->queryitf->unsubscribe(xreq, eventid);
 464         ERROR("no event listener, unsubscription impossible");
 465         errno = EINVAL;
 466         return -1;
 467 }
 468
 469 static void xreq_subcall_cb(struct afb_request *closure, const char *api, const char *verb, struct json_object *args, void (*callback)(void*, int, struct json_object*), void *cb_closure)
 470 {
 471         struct afb_xreq *xreq = from_request(closure);
 472         struct subcall *sc;
 473
 474         sc = subcall_alloc(xreq, api, verb, args);
 475         if (sc == NULL) {
 476                 if (callback)
 477                         callback(cb_closure, 1, afb_msg_json_internal_error());
 478                 json_object_put(args);
 479         } else {
 480                 subcall(sc, callback, cb_closure);
 481         }
 482 }
 483
 484 static void xreq_subcall_req_cb(struct afb_request *closure, const char *api, const char *verb, struct json_object *args, void (*callback)(void*, int, struct json_object*, struct afb_req), void *cb_closure)
 485 {
 486         struct afb_xreq *xreq = from_request(closure);
 487         struct subcall *sc;
 488
 489         sc = subcall_alloc(xreq, api, verb, args);
 490         if (sc == NULL) {
 491                 if (callback)
 492                         callback(cb_closure, 1, afb_msg_json_internal_error(), to_req(xreq));
 493                 json_object_put(args);
 494         } else {
 495                 subcall_req(sc, callback, cb_closure);
 496         }
 497 }
 498
 499
 500 static int xreq_subcallsync_cb(struct afb_request *closure, const char *api, const char *verb, struct json_object *args, struct json_object **result)
 501 {
 502         int rc;
 503         struct subcall *sc;
 504         struct afb_xreq *xreq = from_request(closure);
 505         struct json_object *resu;
 506
 507         sc = subcall_alloc(xreq, api, verb, args);
 508         if (!sc) {
 509                 rc = -1;
 510                 resu = afb_msg_json_internal_error();
 511                 json_object_put(args);
 512         } else {
 513                 rc = subcallsync(sc, &resu);
 514         }
 515         if (result)
 516                 *result = resu;
 517         else
 518                 json_object_put(resu);
 519         return rc;
 520 }
 521
 522 static void xreq_vverbose_cb(struct afb_request *closure, int level, const char *file, int line, const char *func, const char *fmt, va_list args)
 523 {
 524         char *p;
 525         struct afb_xreq *xreq = from_request(closure);
 526
 527         if (!fmt || vasprintf(&p, fmt, args) < 0)
 528                 vverbose(level, file, line, func, fmt, args);
 529         else {
 530                 verbose(level, file, line, func, "[REQ/API %s] %s", xreq->api, p);
 531                 free(p);
 532         }
 533 }
 534
 535 static struct afb_stored_req *xreq_store_cb(struct afb_request *closure)
 536 {
 537         xreq_addref_cb(closure);
 538         return (struct afb_stored_req*)closure;
 539 }
 540
 541 static int xreq_has_permission_cb(struct afb_request *closure, const char *permission)
 542 {
 543         struct afb_xreq *xreq = from_request(closure);
 544         return afb_auth_has_permission(xreq, permission);
 545 }
 546
 547 static char *xreq_get_application_id_cb(struct afb_request *closure)
 548 {
 549         struct afb_xreq *xreq = from_request(closure);
 550         return xreq->cred && xreq->cred->id ? strdup(xreq->cred->id) : NULL;
 551 }
 552
 553 static void *xreq_context_make_cb(struct afb_request *closure, int replace, void *(*create_value)(void*), void (*free_value)(void*), void *create_closure)
 554 {
 555         struct afb_xreq *xreq = from_request(closure);
 556         return afb_context_make(&xreq->context, replace, create_value, free_value, create_closure);
 557 }
 558
 559 /******************************************************************************/
 560
 561 static struct json_object *xreq_hooked_json_cb(struct afb_request *closure)
 562 {
 563         struct json_object *r = xreq_json_cb(closure);
 564         struct afb_xreq *xreq = from_request(closure);
 565         return afb_hook_xreq_json(xreq, r);
 566 }
 567
 568 static struct afb_arg xreq_hooked_get_cb(struct afb_request *closure, const char *name)
 569 {
 570         struct afb_arg r = xreq_get_cb(closure, name);
 571         struct afb_xreq *xreq = from_request(closure);
 572         return afb_hook_xreq_get(xreq, name, r);
 573 }
 574
 575 static void xreq_hooked_success_cb(struct afb_request *closure, struct json_object *obj, const char *info)
 576 {
 577         struct afb_xreq *xreq = from_request(closure);
 578         afb_hook_xreq_success(xreq, obj, info);
 579         xreq_success_cb(closure, obj, info);
 580 }
 581
 582 static void xreq_hooked_fail_cb(struct afb_request *closure, const char *status, const char *info)
 583 {
 584         struct afb_xreq *xreq = from_request(closure);
 585         afb_hook_xreq_fail(xreq, status, info);
 586         xreq_fail_cb(closure, status, info);
 587 }
 588
 589 static void xreq_hooked_vsuccess_cb(struct afb_request *closure, struct json_object *obj, const char *fmt, va_list args)
 590 {
 591         vinfo(closure, obj, fmt, args, (void*)xreq_hooked_success_cb);
 592 }
 593
 594 static void xreq_hooked_vfail_cb(struct afb_request *closure, const char *status, const char *fmt, va_list args)
 595 {
 596         vinfo(closure, (void*)status, fmt, args, (void*)xreq_hooked_fail_cb);
 597 }
 598
 599 static void *xreq_hooked_context_get_cb(struct afb_request *closure)
 600 {
 601         void *r = xreq_context_get_cb(closure);
 602         struct afb_xreq *xreq = from_request(closure);
 603         return afb_hook_xreq_context_get(xreq, r);
 604 }
 605
 606 static void xreq_hooked_context_set_cb(struct afb_request *closure, void *value, void (*free_value)(void*))
 607 {
 608         struct afb_xreq *xreq = from_request(closure);
 609         afb_hook_xreq_context_set(xreq, value, free_value);
 610         xreq_context_set_cb(closure, value, free_value);
 611 }
 612
 613 static void xreq_hooked_addref_cb(struct afb_request *closure)
 614 {
 615         struct afb_xreq *xreq = from_request(closure);
 616         afb_hook_xreq_addref(xreq);
 617         xreq_addref_cb(closure);
 618 }
 619
 620 static void xreq_hooked_unref_cb(struct afb_request *closure)
 621 {
 622         struct afb_xreq *xreq = from_request(closure);
 623         afb_hook_xreq_unref(xreq);
 624         xreq_unref_cb(closure);
 625 }
 626
 627 static void xreq_hooked_session_close_cb(struct afb_request *closure)
 628 {
 629         struct afb_xreq *xreq = from_request(closure);
 630         afb_hook_xreq_session_close(xreq);
 631         xreq_session_close_cb(closure);
 632 }
 633
 634 static int xreq_hooked_session_set_LOA_cb(struct afb_request *closure, unsigned level)
 635 {
 636         int r = xreq_session_set_LOA_cb(closure, level);
 637         struct afb_xreq *xreq = from_request(closure);
 638         return afb_hook_xreq_session_set_LOA(xreq, level, r);
 639 }
 640
 641 static int xreq_hooked_subscribe_cb(struct afb_request *closure, struct afb_event event)
 642 {
 643         int r = xreq_subscribe_cb(closure, event);
 644         struct afb_xreq *xreq = from_request(closure);
 645         return afb_hook_xreq_subscribe(xreq, event.closure, r);
 646 }
 647
 648 static int xreq_hooked_unsubscribe_cb(struct afb_request *closure, struct afb_event event)
 649 {
 650         int r = xreq_unsubscribe_cb(closure, event);
 651         struct afb_xreq *xreq = from_request(closure);
 652         return afb_hook_xreq_unsubscribe(xreq, event.closure, r);
 653 }
 654
 655 static void xreq_hooked_subcall_cb(struct afb_request *closure, const char *api, const char *verb, struct json_object *args, void (*callback)(void*, int, struct json_object*), void *cb_closure)
 656 {
 657         struct afb_xreq *xreq = from_request(closure);
 658         struct subcall *sc;
 659
 660         afb_hook_xreq_subcall(xreq, api, verb, args);
 661         sc = subcall_alloc(xreq, api, verb, args);
 662         if (sc == NULL) {
 663                 if (callback)
 664                         callback(cb_closure, 1, afb_msg_json_internal_error());
 665                 json_object_put(args);
 666         } else {
 667                 subcall_hooked(sc, callback, cb_closure);
 668         }
 669 }
 670
 671 static void xreq_hooked_subcall_req_cb(struct afb_request *closure, const char *api, const char *verb, struct json_object *args, void (*callback)(void*, int, struct json_object*, struct afb_req), void *cb_closure)
 672 {
 673         struct afb_xreq *xreq = from_request(closure);
 674         struct subcall *sc;
 675
 676         afb_hook_xreq_subcall_req(xreq, api, verb, args);
 677         sc = subcall_alloc(xreq, api, verb, args);
 678         if (sc == NULL) {
 679                 if (callback)
 680                         callback(cb_closure, 1, afb_msg_json_internal_error(), to_req(xreq));
 681                 json_object_put(args);
 682         } else {
 683                 subcall_req_hooked(sc, callback, cb_closure);
 684         }
 685 }
 686
 687 static int xreq_hooked_subcallsync_cb(struct afb_request *closure, const char *api, const char *verb, struct json_object *args, struct json_object **result)
 688 {
 689         int r;
 690         struct afb_xreq *xreq = from_request(closure);
 691         afb_hook_xreq_subcallsync(xreq, api, verb, args);
 692         r = xreq_subcallsync_cb(closure, api, verb, args, result);
 693         return afb_hook_xreq_subcallsync_result(xreq, r, *result);
 694 }
 695
 696 static void xreq_hooked_vverbose_cb(struct afb_request *closure, int level, const char *file, int line, const char *func, const char *fmt, va_list args)
 697 {
 698         struct afb_xreq *xreq = from_request(closure);
 699         va_list ap;
 700         va_copy(ap, args);
 701         xreq_vverbose_cb(closure, level, file, line, func, fmt, args);
 702         afb_hook_xreq_vverbose(xreq, level, file, line, func, fmt, ap);
 703         va_end(ap);
 704 }
 705
 706 static struct afb_stored_req *xreq_hooked_store_cb(struct afb_request *closure)
 707 {
 708         struct afb_xreq *xreq = from_request(closure);
 709         struct afb_stored_req *r = xreq_store_cb(closure);
 710         afb_hook_xreq_store(xreq, r);
 711         return r;
 712 }
 713
 714 static int xreq_hooked_has_permission_cb(struct afb_request *closure, const char *permission)
 715 {
 716         struct afb_xreq *xreq = from_request(closure);
 717         int r = xreq_has_permission_cb(closure, permission);
 718         return afb_hook_xreq_has_permission(xreq, permission, r);
 719 }
 720
 721 static char *xreq_hooked_get_application_id_cb(struct afb_request *closure)
 722 {
 723         struct afb_xreq *xreq = from_request(closure);
 724         char *r = xreq_get_application_id_cb(closure);
 725         return afb_hook_xreq_get_application_id(xreq, r);
 726 }
 727
 728 static void *xreq_hooked_context_make_cb(struct afb_request *closure, int replace, void *(*create_value)(void*), void (*free_value)(void*), void *create_closure)
 729 {
 730         struct afb_xreq *xreq = from_request(closure);
 731         void *result = xreq_context_make_cb(closure, replace, create_value, free_value, create_closure);
 732         return afb_hook_xreq_context_make(xreq, replace, create_value, free_value, create_closure, result);
 733 }
 734
 735 /******************************************************************************/
 736
 737 const struct afb_request_itf xreq_itf = {
 738         .json = xreq_json_cb,
 739         .get = xreq_get_cb,
 740         .success = xreq_success_cb,
 741         .fail = xreq_fail_cb,
 742         .vsuccess = xreq_vsuccess_cb,
 743         .vfail = xreq_vfail_cb,
 744         .context_get = xreq_context_get_cb,
 745         .context_set = xreq_context_set_cb,
 746         .addref = xreq_addref_cb,
 747         .unref = xreq_unref_cb,
 748         .session_close = xreq_session_close_cb,
 749         .session_set_LOA = xreq_session_set_LOA_cb,
 750         .subscribe = xreq_subscribe_cb,
 751         .unsubscribe = xreq_unsubscribe_cb,
 752         .subcall = xreq_subcall_cb,
 753         .subcallsync = xreq_subcallsync_cb,
 754         .vverbose = xreq_vverbose_cb,
 755         .store = xreq_store_cb,
 756         .subcall_req = xreq_subcall_req_cb,
 757         .has_permission = xreq_has_permission_cb,
 758         .get_application_id = xreq_get_application_id_cb,
 759         .context_make = xreq_context_make_cb
 760 };
 761
 762 const struct afb_request_itf xreq_hooked_itf = {
 763         .json = xreq_hooked_json_cb,
 764         .get = xreq_hooked_get_cb,
 765         .success = xreq_hooked_success_cb,
 766         .fail = xreq_hooked_fail_cb,
 767         .vsuccess = xreq_hooked_vsuccess_cb,
 768         .vfail = xreq_hooked_vfail_cb,
 769         .context_get = xreq_hooked_context_get_cb,
 770         .context_set = xreq_hooked_context_set_cb,
 771         .addref = xreq_hooked_addref_cb,
 772         .unref = xreq_hooked_unref_cb,
 773         .session_close = xreq_hooked_session_close_cb,
 774         .session_set_LOA = xreq_hooked_session_set_LOA_cb,
 775         .subscribe = xreq_hooked_subscribe_cb,
 776         .unsubscribe = xreq_hooked_unsubscribe_cb,
 777         .subcall = xreq_hooked_subcall_cb,
 778         .subcallsync = xreq_hooked_subcallsync_cb,
 779         .vverbose = xreq_hooked_vverbose_cb,
 780         .store = xreq_hooked_store_cb,
 781         .subcall_req = xreq_hooked_subcall_req_cb,
 782         .has_permission = xreq_hooked_has_permission_cb,
 783         .get_application_id = xreq_hooked_get_application_id_cb,
 784         .context_make = xreq_hooked_context_make_cb
 785 };
 786
 787 /******************************************************************************/
 788
 789 struct afb_req afb_xreq_unstore(struct afb_stored_req *sreq)
 790 {
 791         struct afb_xreq *xreq = (struct afb_xreq *)sreq;
 792         if (xreq->hookflags)
 793                 afb_hook_xreq_unstore(xreq);
 794         return to_req(xreq);
 795 }
 796
 797 struct json_object *afb_xreq_json(struct afb_xreq *xreq)
 798 {
 799         return afb_request_json(to_request(xreq));
 800 }
 801
 802 void afb_xreq_success(struct afb_xreq *xreq, struct json_object *obj, const char *info)
 803 {
 804         afb_request_success(to_request(xreq), obj, info);
 805 }
 806
 807 void afb_xreq_success_f(struct afb_xreq *xreq, struct json_object *obj, const char *info, ...)
 808 {
 809         va_list args;
 810
 811         va_start(args, info);
 812         afb_request_success_v(to_request(xreq), obj, info, args);
 813         va_end(args);
 814 }
 815
 816 void afb_xreq_fail(struct afb_xreq *xreq, const char *status, const char *info)
 817 {
 818         afb_request_fail(to_request(xreq), status, info);
 819 }
 820
 821 void afb_xreq_fail_f(struct afb_xreq *xreq, const char *status, const char *info, ...)
 822 {
 823         va_list args;
 824
 825         va_start(args, info);
 826         afb_request_fail_v(to_request(xreq), status, info, args);
 827         va_end(args);
 828
 829 }
 830
 831 const char *afb_xreq_raw(struct afb_xreq *xreq, size_t *size)
 832 {
 833         struct json_object *obj = xreq_json_cb(to_request(xreq));
 834         const char *result = json_object_to_json_string(obj);
 835         if (size != NULL)
 836                 *size = strlen(result);
 837         return result;
 838 }
 839
 840 void afb_xreq_addref(struct afb_xreq *xreq)
 841 {
 842         afb_request_addref(to_request(xreq));
 843 }
 844
 845 void afb_xreq_unref(struct afb_xreq *xreq)
 846 {
 847         afb_request_unref(to_request(xreq));
 848 }
 849
 850 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)
 851 {
 852         xreq_subcall_cb(to_request(xreq), api, verb, args, callback, cb_closure);
 853 }
 854
 855 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)
 856 {
 857         afb_request_subcall(to_request(xreq), api, verb, args, callback, cb_closure);
 858 }
 859
 860 int afb_xreq_unhooked_subcall_sync(struct afb_xreq *xreq, const char *api, const char *verb, struct json_object *args, struct json_object **result)
 861 {
 862         return xreq_subcallsync_cb(to_request(xreq), api, verb, args, result);
 863 }
 864
 865 int afb_xreq_subcall_sync(struct afb_xreq *xreq, const char *api, const char *verb, struct json_object *args, struct json_object **result)
 866 {
 867         return afb_request_subcall_sync(to_request(xreq), api, verb, args, result);
 868 }
 869
 870 static int xreq_session_check_apply_v1(struct afb_xreq *xreq, int sessionflags)
 871 {
 872         int loa;
 873
 874         if ((sessionflags & (AFB_SESSION_CLOSE_V1|AFB_SESSION_RENEW_V1|AFB_SESSION_CHECK_V1|AFB_SESSION_LOA_EQ_V1)) != 0) {
 875                 if (!afb_context_check(&xreq->context)) {
 876                         afb_context_close(&xreq->context);
 877                         afb_xreq_fail_f(xreq, "denied", "invalid token's identity");
 878                         errno = EINVAL;
 879                         return -1;
 880                 }
 881         }
 882
 883         if ((sessionflags & AFB_SESSION_LOA_GE_V1) != 0) {
 884                 loa = (sessionflags >> AFB_SESSION_LOA_SHIFT_V1) & AFB_SESSION_LOA_MASK_V1;
 885                 if (!afb_context_check_loa(&xreq->context, loa)) {
 886                         afb_xreq_fail_f(xreq, "denied", "invalid LOA");
 887                         errno = EPERM;
 888                         return -1;
 889                 }
 890         }
 891
 892         if ((sessionflags & AFB_SESSION_LOA_LE_V1) != 0) {
 893                 loa = (sessionflags >> AFB_SESSION_LOA_SHIFT_V1) & AFB_SESSION_LOA_MASK_V1;
 894                 if (afb_context_check_loa(&xreq->context, loa + 1)) {
 895                         afb_xreq_fail_f(xreq, "denied", "invalid LOA");
 896                         errno = EPERM;
 897                         return -1;
 898                 }
 899         }
 900
 901         if ((sessionflags & AFB_SESSION_RENEW_V1) != 0) {
 902                 afb_context_refresh(&xreq->context);
 903         }
 904         if ((sessionflags & AFB_SESSION_CLOSE_V1) != 0) {
 905                 afb_context_change_loa(&xreq->context, 0);
 906                 afb_context_close(&xreq->context);
 907         }
 908
 909         return 0;
 910 }
 911
 912 static int xreq_session_check_apply_v2(struct afb_xreq *xreq, uint32_t sessionflags, const struct afb_auth *auth)
 913 {
 914         int loa;
 915
 916         if (sessionflags != 0) {
 917                 if (!afb_context_check(&xreq->context)) {
 918                         afb_context_close(&xreq->context);
 919                         afb_xreq_fail_f(xreq, "denied", "invalid token's identity");
 920                         errno = EINVAL;
 921                         return -1;
 922                 }
 923         }
 924
 925         loa = (int)(sessionflags & AFB_SESSION_LOA_MASK_V2);
 926         if (loa && !afb_context_check_loa(&xreq->context, loa)) {
 927                 afb_xreq_fail_f(xreq, "denied", "invalid LOA");
 928                 errno = EPERM;
 929                 return -1;
 930         }
 931
 932         if (auth && !afb_auth_check(xreq, auth)) {
 933                 afb_xreq_fail_f(xreq, "denied", "authorisation refused");
 934                 errno = EPERM;
 935                 return -1;
 936         }
 937
 938         if ((sessionflags & AFB_SESSION_REFRESH_V2) != 0) {
 939                 afb_context_refresh(&xreq->context);
 940         }
 941         if ((sessionflags & AFB_SESSION_CLOSE_V2) != 0) {
 942                 afb_context_close(&xreq->context);
 943         }
 944
 945         return 0;
 946 }
 947
 948 void afb_xreq_call_verb_v1(struct afb_xreq *xreq, const struct afb_verb_desc_v1 *verb)
 949 {
 950         if (!verb)
 951                 afb_xreq_fail_unknown_verb(xreq);
 952         else
 953                 if (!xreq_session_check_apply_v1(xreq, verb->session))
 954                         verb->callback(to_req(xreq));
 955 }
 956
 957 void afb_xreq_call_verb_v2(struct afb_xreq *xreq, const struct afb_verb_v2 *verb)
 958 {
 959         if (!verb)
 960                 afb_xreq_fail_unknown_verb(xreq);
 961         else
 962                 if (!xreq_session_check_apply_v2(xreq, verb->session, verb->auth))
 963                         verb->callback(to_req(xreq));
 964 }
 965
 966 void afb_xreq_init(struct afb_xreq *xreq, const struct afb_xreq_query_itf *queryitf)
 967 {
 968         memset(xreq, 0, sizeof *xreq);
 969         xreq->request.itf = &xreq_hooked_itf; /* hook by default */
 970         xreq->refcount = 1;
 971         xreq->queryitf = queryitf;
 972 }
 973
 974 void afb_xreq_fail_unknown_api(struct afb_xreq *xreq)
 975 {
 976         afb_xreq_fail_f(xreq, "unknown-api", "api %s not found (for verb %s)", xreq->api, xreq->verb);
 977 }
 978
 979 void afb_xreq_fail_unknown_verb(struct afb_xreq *xreq)
 980 {
 981         afb_xreq_fail_f(xreq, "unknown-verb", "verb %s unknown within api %s", xreq->verb, xreq->api);
 982 }
 983
 984 static void init_hooking(struct afb_xreq *xreq)
 985 {
 986         afb_hook_init_xreq(xreq);
 987         if (xreq->hookflags)
 988                 afb_hook_xreq_begin(xreq);
 989         else
 990                 xreq->request.itf = &xreq_itf; /* unhook the interface */
 991 }
 992
 993 /**
 994  * job callback for asynchronous and secured processing of the request.
 995  */
 996 static void process_async(int signum, void *arg)
 997 {
 998         struct afb_xreq *xreq = arg;
 999         const struct afb_api *api;
1000
1001         if (signum != 0) {
1002                 /* emit the error (assumes that hooking is initialised) */
1003                 afb_xreq_fail_f(xreq, "aborted", "signal %s(%d) caught", strsignal(signum), signum);
1004         } else {
1005                 /* init hooking */
1006                 init_hooking(xreq);
1007                 /* invoke api call method to process the reqiest */
1008                 api = (const struct afb_api*)xreq->context.api_key;
1009                 api->itf->call(api->closure, xreq);
1010         }
1011         /* release the request */
1012         afb_xreq_unhooked_unref(xreq);
1013 }
1014
1015 /**
1016  * Early request failure of the request 'xreq' with, as usual, 'status' and 'info'
1017  * The early failure occurs only in function 'afb_xreq_process' where normally,
1018  * the hooking is not initialised. So this "early" failure takes care to initialise
1019  * the hooking in first.
1020  */
1021 static void early_failure(struct afb_xreq *xreq, const char *status, const char *info, ...)
1022 {
1023         va_list args;
1024
1025         /* init hooking */
1026         init_hooking(xreq);
1027
1028         /* send error */
1029         va_start(args, info);
1030         afb_request_fail_v(to_request(xreq), status, info, args);
1031         va_end(args);
1032 }
1033
1034 /**
1035  * Enqueue a job for processing the request 'xreq' using the given 'apiset'.
1036  * Errors are reported as request failures.
1037  */
1038 void afb_xreq_process(struct afb_xreq *xreq, struct afb_apiset *apiset)
1039 {
1040         const struct afb_api *api;
1041         struct afb_xreq *caller;
1042
1043         /* lookup at the api */
1044         xreq->apiset = apiset;
1045         api = afb_apiset_lookup_started(apiset, xreq->api, 1);
1046         if (!api) {
1047                 if (errno == ENOENT)
1048                         early_failure(xreq, "unknown-api", "api %s not found (for verb %s)", xreq->api, xreq->verb);
1049                 else
1050                         early_failure(xreq, "bad-api-state", "api %s not started correctly: %m", xreq->api);
1051                 goto end;
1052         }
1053         xreq->context.api_key = api;
1054
1055         /* check self locking */
1056         if (api->group) {
1057                 caller = xreq->caller;
1058                 while (caller) {
1059                         if (((const struct afb_api *)caller->context.api_key)->group == api->group) {
1060                                 /* noconcurrency lock detected */
1061                                 ERROR("self-lock detected in call stack for API %s", xreq->api);
1062                                 early_failure(xreq, "self-locked", "recursive self lock, API %s", xreq->api);
1063                                 goto end;
1064                         }
1065                         caller = caller->caller;
1066                 }
1067         }
1068
1069         /* queue the request job */
1070         afb_xreq_unhooked_addref(xreq);
1071         if (jobs_queue(api->group, afb_apiset_timeout_get(apiset), process_async, xreq) < 0) {
1072                 /* TODO: allows or not to proccess it directly as when no threading? (see above) */
1073                 ERROR("can't process job with threads: %m");
1074                 early_failure(xreq, "cancelled", "not able to create a job for the task");
1075                 afb_xreq_unhooked_unref(xreq);
1076         }
1077 end:
1078         afb_xreq_unhooked_unref(xreq);
1079 }
1080