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_event event)
 108 {
 109         struct subcall *subcall = CONTAINER_OF_XREQ(struct subcall, xreq);
 110
 111         return afb_xreq_subscribe(subcall->xreq.caller, event);
 112 }
 113
 114 static int subcall_unsubscribe_cb(struct afb_xreq *xreq, struct afb_event event)
 115 {
 116         struct subcall *subcall = CONTAINER_OF_XREQ(struct subcall, xreq);
 117
 118         return afb_xreq_unsubscribe(subcall->xreq.caller, event);
 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_cb(struct afb_request *closure, struct afb_event event)
 424 {
 425         struct afb_xreq *xreq = from_request(closure);
 426         return afb_xreq_subscribe(xreq, event);
 427 }
 428
 429 int afb_xreq_subscribe(struct afb_xreq *xreq, struct afb_event event)
 430 {
 431         if (xreq->listener)
 432                 return afb_evt_add_watch(xreq->listener, event);
 433         if (xreq->queryitf->subscribe)
 434                 return xreq->queryitf->subscribe(xreq, event);
 435         ERROR("no event listener, subscription impossible");
 436         errno = EINVAL;
 437         return -1;
 438 }
 439
 440 static int xreq_unsubscribe_cb(struct afb_request *closure, struct afb_event event)
 441 {
 442         struct afb_xreq *xreq = from_request(closure);
 443         return afb_xreq_unsubscribe(xreq, event);
 444 }
 445
 446 int afb_xreq_unsubscribe(struct afb_xreq *xreq, struct afb_event event)
 447 {
 448         if (xreq->listener)
 449                 return afb_evt_remove_watch(xreq->listener, event);
 450         if (xreq->queryitf->unsubscribe)
 451                 return xreq->queryitf->unsubscribe(xreq, event);
 452         ERROR("no event listener, unsubscription impossible");
 453         errno = EINVAL;
 454         return -1;
 455 }
 456
 457 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)
 458 {
 459         struct afb_xreq *xreq = from_request(closure);
 460         struct subcall *sc;
 461
 462         sc = subcall_alloc(xreq, api, verb, args);
 463         if (sc == NULL) {
 464                 if (callback)
 465                         callback(cb_closure, 1, afb_msg_json_internal_error());
 466                 json_object_put(args);
 467         } else {
 468                 subcall(sc, callback, cb_closure);
 469         }
 470 }
 471
 472 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)
 473 {
 474         struct afb_xreq *xreq = from_request(closure);
 475         struct subcall *sc;
 476
 477         sc = subcall_alloc(xreq, api, verb, args);
 478         if (sc == NULL) {
 479                 if (callback)
 480                         callback(cb_closure, 1, afb_msg_json_internal_error(), to_req(xreq));
 481                 json_object_put(args);
 482         } else {
 483                 subcall_req(sc, callback, cb_closure);
 484         }
 485 }
 486
 487
 488 static int xreq_subcallsync_cb(struct afb_request *closure, const char *api, const char *verb, struct json_object *args, struct json_object **result)
 489 {
 490         int rc;
 491         struct subcall *sc;
 492         struct afb_xreq *xreq = from_request(closure);
 493         struct json_object *resu;
 494
 495         sc = subcall_alloc(xreq, api, verb, args);
 496         if (!sc) {
 497                 rc = -1;
 498                 resu = afb_msg_json_internal_error();
 499                 json_object_put(args);
 500         } else {
 501                 rc = subcallsync(sc, &resu);
 502         }
 503         if (result)
 504                 *result = resu;
 505         else
 506                 json_object_put(resu);
 507         return rc;
 508 }
 509
 510 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)
 511 {
 512         char *p;
 513         struct afb_xreq *xreq = from_request(closure);
 514
 515         if (!fmt || vasprintf(&p, fmt, args) < 0)
 516                 vverbose(level, file, line, func, fmt, args);
 517         else {
 518                 verbose(level, file, line, func, "[REQ/API %s] %s", xreq->api, p);
 519                 free(p);
 520         }
 521 }
 522
 523 static struct afb_stored_req *xreq_store_cb(struct afb_request *closure)
 524 {
 525         xreq_addref_cb(closure);
 526         return (struct afb_stored_req*)closure;
 527 }
 528
 529 static int xreq_has_permission_cb(struct afb_request *closure, const char *permission)
 530 {
 531         struct afb_xreq *xreq = from_request(closure);
 532         return afb_auth_has_permission(xreq, permission);
 533 }
 534
 535 static char *xreq_get_application_id_cb(struct afb_request *closure)
 536 {
 537         struct afb_xreq *xreq = from_request(closure);
 538         return xreq->cred && xreq->cred->id ? strdup(xreq->cred->id) : NULL;
 539 }
 540
 541 static void *xreq_context_make_cb(struct afb_request *closure, int replace, void *(*create_value)(void*), void (*free_value)(void*), void *create_closure)
 542 {
 543         struct afb_xreq *xreq = from_request(closure);
 544         return afb_context_make(&xreq->context, replace, create_value, free_value, create_closure);
 545 }
 546
 547 /******************************************************************************/
 548
 549 static struct json_object *xreq_hooked_json_cb(struct afb_request *closure)
 550 {
 551         struct json_object *r = xreq_json_cb(closure);
 552         struct afb_xreq *xreq = from_request(closure);
 553         return afb_hook_xreq_json(xreq, r);
 554 }
 555
 556 static struct afb_arg xreq_hooked_get_cb(struct afb_request *closure, const char *name)
 557 {
 558         struct afb_arg r = xreq_get_cb(closure, name);
 559         struct afb_xreq *xreq = from_request(closure);
 560         return afb_hook_xreq_get(xreq, name, r);
 561 }
 562
 563 static void xreq_hooked_success_cb(struct afb_request *closure, struct json_object *obj, const char *info)
 564 {
 565         struct afb_xreq *xreq = from_request(closure);
 566         afb_hook_xreq_success(xreq, obj, info);
 567         xreq_success_cb(closure, obj, info);
 568 }
 569
 570 static void xreq_hooked_fail_cb(struct afb_request *closure, const char *status, const char *info)
 571 {
 572         struct afb_xreq *xreq = from_request(closure);
 573         afb_hook_xreq_fail(xreq, status, info);
 574         xreq_fail_cb(closure, status, info);
 575 }
 576
 577 static void xreq_hooked_vsuccess_cb(struct afb_request *closure, struct json_object *obj, const char *fmt, va_list args)
 578 {
 579         vinfo(closure, obj, fmt, args, (void*)xreq_hooked_success_cb);
 580 }
 581
 582 static void xreq_hooked_vfail_cb(struct afb_request *closure, const char *status, const char *fmt, va_list args)
 583 {
 584         vinfo(closure, (void*)status, fmt, args, (void*)xreq_hooked_fail_cb);
 585 }
 586
 587 static void *xreq_hooked_context_get_cb(struct afb_request *closure)
 588 {
 589         void *r = xreq_context_get_cb(closure);
 590         struct afb_xreq *xreq = from_request(closure);
 591         return afb_hook_xreq_context_get(xreq, r);
 592 }
 593
 594 static void xreq_hooked_context_set_cb(struct afb_request *closure, void *value, void (*free_value)(void*))
 595 {
 596         struct afb_xreq *xreq = from_request(closure);
 597         afb_hook_xreq_context_set(xreq, value, free_value);
 598         xreq_context_set_cb(closure, value, free_value);
 599 }
 600
 601 static void xreq_hooked_addref_cb(struct afb_request *closure)
 602 {
 603         struct afb_xreq *xreq = from_request(closure);
 604         afb_hook_xreq_addref(xreq);
 605         xreq_addref_cb(closure);
 606 }
 607
 608 static void xreq_hooked_unref_cb(struct afb_request *closure)
 609 {
 610         struct afb_xreq *xreq = from_request(closure);
 611         afb_hook_xreq_unref(xreq);
 612         xreq_unref_cb(closure);
 613 }
 614
 615 static void xreq_hooked_session_close_cb(struct afb_request *closure)
 616 {
 617         struct afb_xreq *xreq = from_request(closure);
 618         afb_hook_xreq_session_close(xreq);
 619         xreq_session_close_cb(closure);
 620 }
 621
 622 static int xreq_hooked_session_set_LOA_cb(struct afb_request *closure, unsigned level)
 623 {
 624         int r = xreq_session_set_LOA_cb(closure, level);
 625         struct afb_xreq *xreq = from_request(closure);
 626         return afb_hook_xreq_session_set_LOA(xreq, level, r);
 627 }
 628
 629 static int xreq_hooked_subscribe_cb(struct afb_request *closure, struct afb_event event)
 630 {
 631         int r = xreq_subscribe_cb(closure, event);
 632         struct afb_xreq *xreq = from_request(closure);
 633         return afb_hook_xreq_subscribe(xreq, event, r);
 634 }
 635
 636 static int xreq_hooked_unsubscribe_cb(struct afb_request *closure, struct afb_event event)
 637 {
 638         int r = xreq_unsubscribe_cb(closure, event);
 639         struct afb_xreq *xreq = from_request(closure);
 640         return afb_hook_xreq_unsubscribe(xreq, event, r);
 641 }
 642
 643 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)
 644 {
 645         struct afb_xreq *xreq = from_request(closure);
 646         struct subcall *sc;
 647
 648         afb_hook_xreq_subcall(xreq, api, verb, args);
 649         sc = subcall_alloc(xreq, api, verb, args);
 650         if (sc == NULL) {
 651                 if (callback)
 652                         callback(cb_closure, 1, afb_msg_json_internal_error());
 653                 json_object_put(args);
 654         } else {
 655                 subcall_hooked(sc, callback, cb_closure);
 656         }
 657 }
 658
 659 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)
 660 {
 661         struct afb_xreq *xreq = from_request(closure);
 662         struct subcall *sc;
 663
 664         afb_hook_xreq_subcall_req(xreq, api, verb, args);
 665         sc = subcall_alloc(xreq, api, verb, args);
 666         if (sc == NULL) {
 667                 if (callback)
 668                         callback(cb_closure, 1, afb_msg_json_internal_error(), to_req(xreq));
 669                 json_object_put(args);
 670         } else {
 671                 subcall_req_hooked(sc, callback, cb_closure);
 672         }
 673 }
 674
 675 static int xreq_hooked_subcallsync_cb(struct afb_request *closure, const char *api, const char *verb, struct json_object *args, struct json_object **result)
 676 {
 677         int r;
 678         struct afb_xreq *xreq = from_request(closure);
 679         afb_hook_xreq_subcallsync(xreq, api, verb, args);
 680         r = xreq_subcallsync_cb(closure, api, verb, args, result);
 681         return afb_hook_xreq_subcallsync_result(xreq, r, *result);
 682 }
 683
 684 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)
 685 {
 686         struct afb_xreq *xreq = from_request(closure);
 687         va_list ap;
 688         va_copy(ap, args);
 689         xreq_vverbose_cb(closure, level, file, line, func, fmt, args);
 690         afb_hook_xreq_vverbose(xreq, level, file, line, func, fmt, ap);
 691         va_end(ap);
 692 }
 693
 694 static struct afb_stored_req *xreq_hooked_store_cb(struct afb_request *closure)
 695 {
 696         struct afb_xreq *xreq = from_request(closure);
 697         struct afb_stored_req *r = xreq_store_cb(closure);
 698         afb_hook_xreq_store(xreq, r);
 699         return r;
 700 }
 701
 702 static int xreq_hooked_has_permission_cb(struct afb_request *closure, const char *permission)
 703 {
 704         struct afb_xreq *xreq = from_request(closure);
 705         int r = xreq_has_permission_cb(closure, permission);
 706         return afb_hook_xreq_has_permission(xreq, permission, r);
 707 }
 708
 709 static char *xreq_hooked_get_application_id_cb(struct afb_request *closure)
 710 {
 711         struct afb_xreq *xreq = from_request(closure);
 712         char *r = xreq_get_application_id_cb(closure);
 713         return afb_hook_xreq_get_application_id(xreq, r);
 714 }
 715
 716 static void *xreq_hooked_context_make_cb(struct afb_request *closure, int replace, void *(*create_value)(void*), void (*free_value)(void*), void *create_closure)
 717 {
 718         struct afb_xreq *xreq = from_request(closure);
 719         void *result = xreq_context_make_cb(closure, replace, create_value, free_value, create_closure);
 720         return afb_hook_xreq_context_make(xreq, replace, create_value, free_value, create_closure, result);
 721 }
 722
 723 /******************************************************************************/
 724
 725 const struct afb_request_itf xreq_itf = {
 726         .json = xreq_json_cb,
 727         .get = xreq_get_cb,
 728         .success = xreq_success_cb,
 729         .fail = xreq_fail_cb,
 730         .vsuccess = xreq_vsuccess_cb,
 731         .vfail = xreq_vfail_cb,
 732         .context_get = xreq_context_get_cb,
 733         .context_set = xreq_context_set_cb,
 734         .addref = xreq_addref_cb,
 735         .unref = xreq_unref_cb,
 736         .session_close = xreq_session_close_cb,
 737         .session_set_LOA = xreq_session_set_LOA_cb,
 738         .subscribe = xreq_subscribe_cb,
 739         .unsubscribe = xreq_unsubscribe_cb,
 740         .subcall = xreq_subcall_cb,
 741         .subcallsync = xreq_subcallsync_cb,
 742         .vverbose = xreq_vverbose_cb,
 743         .store = xreq_store_cb,
 744         .subcall_req = xreq_subcall_req_cb,
 745         .has_permission = xreq_has_permission_cb,
 746         .get_application_id = xreq_get_application_id_cb,
 747         .context_make = xreq_context_make_cb
 748 };
 749
 750 const struct afb_request_itf xreq_hooked_itf = {
 751         .json = xreq_hooked_json_cb,
 752         .get = xreq_hooked_get_cb,
 753         .success = xreq_hooked_success_cb,
 754         .fail = xreq_hooked_fail_cb,
 755         .vsuccess = xreq_hooked_vsuccess_cb,
 756         .vfail = xreq_hooked_vfail_cb,
 757         .context_get = xreq_hooked_context_get_cb,
 758         .context_set = xreq_hooked_context_set_cb,
 759         .addref = xreq_hooked_addref_cb,
 760         .unref = xreq_hooked_unref_cb,
 761         .session_close = xreq_hooked_session_close_cb,
 762         .session_set_LOA = xreq_hooked_session_set_LOA_cb,
 763         .subscribe = xreq_hooked_subscribe_cb,
 764         .unsubscribe = xreq_hooked_unsubscribe_cb,
 765         .subcall = xreq_hooked_subcall_cb,
 766         .subcallsync = xreq_hooked_subcallsync_cb,
 767         .vverbose = xreq_hooked_vverbose_cb,
 768         .store = xreq_hooked_store_cb,
 769         .subcall_req = xreq_hooked_subcall_req_cb,
 770         .has_permission = xreq_hooked_has_permission_cb,
 771         .get_application_id = xreq_hooked_get_application_id_cb,
 772         .context_make = xreq_hooked_context_make_cb
 773 };
 774
 775 /******************************************************************************/
 776
 777 struct afb_req afb_xreq_unstore(struct afb_stored_req *sreq)
 778 {
 779         struct afb_xreq *xreq = (struct afb_xreq *)sreq;
 780         if (xreq->hookflags)
 781                 afb_hook_xreq_unstore(xreq);
 782         return to_req(xreq);
 783 }
 784
 785 struct json_object *afb_xreq_json(struct afb_xreq *xreq)
 786 {
 787         return afb_request_json(to_request(xreq));
 788 }
 789
 790 void afb_xreq_success(struct afb_xreq *xreq, struct json_object *obj, const char *info)
 791 {
 792         afb_request_success(to_request(xreq), obj, info);
 793 }
 794
 795 void afb_xreq_success_f(struct afb_xreq *xreq, struct json_object *obj, const char *info, ...)
 796 {
 797         va_list args;
 798
 799         va_start(args, info);
 800         afb_request_success_v(to_request(xreq), obj, info, args);
 801         va_end(args);
 802 }
 803
 804 void afb_xreq_fail(struct afb_xreq *xreq, const char *status, const char *info)
 805 {
 806         afb_request_fail(to_request(xreq), status, info);
 807 }
 808
 809 void afb_xreq_fail_f(struct afb_xreq *xreq, const char *status, const char *info, ...)
 810 {
 811         va_list args;
 812
 813         va_start(args, info);
 814         afb_request_fail_v(to_request(xreq), status, info, args);
 815         va_end(args);
 816
 817 }
 818
 819 const char *afb_xreq_raw(struct afb_xreq *xreq, size_t *size)
 820 {
 821         struct json_object *obj = xreq_json_cb(to_request(xreq));
 822         const char *result = json_object_to_json_string(obj);
 823         if (size != NULL)
 824                 *size = strlen(result);
 825         return result;
 826 }
 827
 828 void afb_xreq_addref(struct afb_xreq *xreq)
 829 {
 830         afb_request_addref(to_request(xreq));
 831 }
 832
 833 void afb_xreq_unref(struct afb_xreq *xreq)
 834 {
 835         afb_request_unref(to_request(xreq));
 836 }
 837
 838 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)
 839 {
 840         xreq_subcall_cb(to_request(xreq), api, verb, args, callback, cb_closure);
 841 }
 842
 843 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)
 844 {
 845         afb_request_subcall(to_request(xreq), api, verb, args, callback, cb_closure);
 846 }
 847
 848 int afb_xreq_unhooked_subcall_sync(struct afb_xreq *xreq, const char *api, const char *verb, struct json_object *args, struct json_object **result)
 849 {
 850         return xreq_subcallsync_cb(to_request(xreq), api, verb, args, result);
 851 }
 852
 853 int afb_xreq_subcall_sync(struct afb_xreq *xreq, const char *api, const char *verb, struct json_object *args, struct json_object **result)
 854 {
 855         return afb_request_subcall_sync(to_request(xreq), api, verb, args, result);
 856 }
 857
 858 static int xreq_session_check_apply_v1(struct afb_xreq *xreq, int sessionflags)
 859 {
 860         int loa;
 861
 862         if ((sessionflags & (AFB_SESSION_CLOSE_V1|AFB_SESSION_RENEW_V1|AFB_SESSION_CHECK_V1|AFB_SESSION_LOA_EQ_V1)) != 0) {
 863                 if (!afb_context_check(&xreq->context)) {
 864                         afb_context_close(&xreq->context);
 865                         afb_xreq_fail_f(xreq, "denied", "invalid token's identity");
 866                         errno = EINVAL;
 867                         return -1;
 868                 }
 869         }
 870
 871         if ((sessionflags & AFB_SESSION_LOA_GE_V1) != 0) {
 872                 loa = (sessionflags >> AFB_SESSION_LOA_SHIFT_V1) & AFB_SESSION_LOA_MASK_V1;
 873                 if (!afb_context_check_loa(&xreq->context, loa)) {
 874                         afb_xreq_fail_f(xreq, "denied", "invalid LOA");
 875                         errno = EPERM;
 876                         return -1;
 877                 }
 878         }
 879
 880         if ((sessionflags & AFB_SESSION_LOA_LE_V1) != 0) {
 881                 loa = (sessionflags >> AFB_SESSION_LOA_SHIFT_V1) & AFB_SESSION_LOA_MASK_V1;
 882                 if (afb_context_check_loa(&xreq->context, loa + 1)) {
 883                         afb_xreq_fail_f(xreq, "denied", "invalid LOA");
 884                         errno = EPERM;
 885                         return -1;
 886                 }
 887         }
 888
 889         if ((sessionflags & AFB_SESSION_RENEW_V1) != 0) {
 890                 afb_context_refresh(&xreq->context);
 891         }
 892         if ((sessionflags & AFB_SESSION_CLOSE_V1) != 0) {
 893                 afb_context_change_loa(&xreq->context, 0);
 894                 afb_context_close(&xreq->context);
 895         }
 896
 897         return 0;
 898 }
 899
 900 static int xreq_session_check_apply_v2(struct afb_xreq *xreq, uint32_t sessionflags, const struct afb_auth *auth)
 901 {
 902         int loa;
 903
 904         if (sessionflags != 0) {
 905                 if (!afb_context_check(&xreq->context)) {
 906                         afb_context_close(&xreq->context);
 907                         afb_xreq_fail_f(xreq, "denied", "invalid token's identity");
 908                         errno = EINVAL;
 909                         return -1;
 910                 }
 911         }
 912
 913         loa = (int)(sessionflags & AFB_SESSION_LOA_MASK_V2);
 914         if (loa && !afb_context_check_loa(&xreq->context, loa)) {
 915                 afb_xreq_fail_f(xreq, "denied", "invalid LOA");
 916                 errno = EPERM;
 917                 return -1;
 918         }
 919
 920         if (auth && !afb_auth_check(xreq, auth)) {
 921                 afb_xreq_fail_f(xreq, "denied", "authorisation refused");
 922                 errno = EPERM;
 923                 return -1;
 924         }
 925
 926         if ((sessionflags & AFB_SESSION_REFRESH_V2) != 0) {
 927                 afb_context_refresh(&xreq->context);
 928         }
 929         if ((sessionflags & AFB_SESSION_CLOSE_V2) != 0) {
 930                 afb_context_close(&xreq->context);
 931         }
 932
 933         return 0;
 934 }
 935
 936 void afb_xreq_call_verb_v1(struct afb_xreq *xreq, const struct afb_verb_desc_v1 *verb)
 937 {
 938         if (!verb)
 939                 afb_xreq_fail_unknown_verb(xreq);
 940         else
 941                 if (!xreq_session_check_apply_v1(xreq, verb->session))
 942                         verb->callback(to_req(xreq));
 943 }
 944
 945 void afb_xreq_call_verb_v2(struct afb_xreq *xreq, const struct afb_verb_v2 *verb)
 946 {
 947         if (!verb)
 948                 afb_xreq_fail_unknown_verb(xreq);
 949         else
 950                 if (!xreq_session_check_apply_v2(xreq, verb->session, verb->auth))
 951                         verb->callback(to_req(xreq));
 952 }
 953
 954 void afb_xreq_init(struct afb_xreq *xreq, const struct afb_xreq_query_itf *queryitf)
 955 {
 956         memset(xreq, 0, sizeof *xreq);
 957         xreq->request.itf = &xreq_hooked_itf; /* hook by default */
 958         xreq->refcount = 1;
 959         xreq->queryitf = queryitf;
 960 }
 961
 962 void afb_xreq_fail_unknown_api(struct afb_xreq *xreq)
 963 {
 964         afb_xreq_fail_f(xreq, "unknown-api", "api %s not found (for verb %s)", xreq->api, xreq->verb);
 965 }
 966
 967 void afb_xreq_fail_unknown_verb(struct afb_xreq *xreq)
 968 {
 969         afb_xreq_fail_f(xreq, "unknown-verb", "verb %s unknown within api %s", xreq->verb, xreq->api);
 970 }
 971
 972 static void init_hooking(struct afb_xreq *xreq)
 973 {
 974         afb_hook_init_xreq(xreq);
 975         if (xreq->hookflags)
 976                 afb_hook_xreq_begin(xreq);
 977         else
 978                 xreq->request.itf = &xreq_itf; /* unhook the interface */
 979 }
 980
 981 /**
 982  * job callback for asynchronous and secured processing of the request.
 983  */
 984 static void process_async(int signum, void *arg)
 985 {
 986         struct afb_xreq *xreq = arg;
 987         const struct afb_api *api;
 988
 989         if (signum != 0) {
 990                 /* emit the error (assumes that hooking is initialised) */
 991                 afb_xreq_fail_f(xreq, "aborted", "signal %s(%d) caught", strsignal(signum), signum);
 992         } else {
 993                 /* init hooking */
 994                 init_hooking(xreq);
 995                 /* invoke api call method to process the reqiest */
 996                 api = (const struct afb_api*)xreq->context.api_key;
 997                 api->itf->call(api->closure, xreq);
 998         }
 999         /* release the request */
1000         afb_xreq_unhooked_unref(xreq);
1001 }
1002
1003 /**
1004  * Early request failure of the request 'xreq' with, as usual, 'status' and 'info'
1005  * The early failure occurs only in function 'afb_xreq_process' where normally,
1006  * the hooking is not initialised. So this "early" failure takes care to initialise
1007  * the hooking in first.
1008  */
1009 static void early_failure(struct afb_xreq *xreq, const char *status, const char *info, ...)
1010 {
1011         va_list args;
1012
1013         /* init hooking */
1014         init_hooking(xreq);
1015
1016         /* send error */
1017         va_start(args, info);
1018         afb_request_fail_v(to_request(xreq), status, info, args);
1019         va_end(args);
1020 }
1021
1022 /**
1023  * Enqueue a job for processing the request 'xreq' using the given 'apiset'.
1024  * Errors are reported as request failures.
1025  */
1026 void afb_xreq_process(struct afb_xreq *xreq, struct afb_apiset *apiset)
1027 {
1028         const struct afb_api *api;
1029         struct afb_xreq *caller;
1030
1031         /* lookup at the api */
1032         xreq->apiset = apiset;
1033         api = afb_apiset_lookup_started(apiset, xreq->api, 1);
1034         if (!api) {
1035                 if (errno == ENOENT)
1036                         early_failure(xreq, "unknown-api", "api %s not found (for verb %s)", xreq->api, xreq->verb);
1037                 else
1038                         early_failure(xreq, "bad-api-state", "api %s not started correctly: %m", xreq->api);
1039                 goto end;
1040         }
1041         xreq->context.api_key = api;
1042
1043         /* check self locking */
1044         if (api->group) {
1045                 caller = xreq->caller;
1046                 while (caller) {
1047                         if (((const struct afb_api *)caller->context.api_key)->group == api->group) {
1048                                 /* noconcurrency lock detected */
1049                                 ERROR("self-lock detected in call stack for API %s", xreq->api);
1050                                 early_failure(xreq, "self-locked", "recursive self lock, API %s", xreq->api);
1051                                 goto end;
1052                         }
1053                         caller = caller->caller;
1054                 }
1055         }
1056
1057         /* queue the request job */
1058         afb_xreq_unhooked_addref(xreq);
1059         if (jobs_queue(api->group, afb_apiset_timeout_get(apiset), process_async, xreq) < 0) {
1060                 /* TODO: allows or not to proccess it directly as when no threading? (see above) */
1061                 ERROR("can't process job with threads: %m");
1062                 early_failure(xreq, "cancelled", "not able to create a job for the task");
1063                 afb_xreq_unhooked_unref(xreq);
1064         }
1065 end:
1066         afb_xreq_unhooked_unref(xreq);
1067 }
1068