http/http_blerg.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <string.h>
   4 #include <microhttpd.h>
   5 #include <yajl/yajl_gen.h>
   6 #include "database.h"
   7 #include "tags.h"
   8 #include "auth.h"
   9 #include "canned_responses.h"
  10 #include "app.h"
  11 #include "config.h"
  12
  13 yajl_gen_config yajl_c = { 0, 0 };
  14
  15 struct auth_state {
  16         struct MHD_PostProcessor *pp;
  17         char username[33];
  18         char password[33];
  19 };
  20
  21 struct put_state {
  22         struct MHD_PostProcessor *pp;
  23         char username[33];
  24         char *data;
  25         int data_size;
  26 };
  27
  28 struct get_state {
  29         struct blerg *b;
  30         yajl_gen g;
  31         unsigned int yoff;
  32         uint64_t *entries;
  33         uint64_t i;
  34         int done;
  35 };
  36
  37 struct tag_state {
  38         yajl_gen g;
  39         unsigned int yoff;
  40         struct tag *results;
  41         uint64_t i;
  42         int done;
  43 };
  44
  45 ssize_t GET_generate_list(void *cls, uint64_t pos, char *buf, size_t max) {
  46         struct get_state *gs = cls;
  47         const unsigned char *ybuf;
  48         char *data;
  49         char number[21];
  50         unsigned int len;
  51
  52         if (gs->yoff > 0) {
  53                 yajl_gen_get_buf(gs->g, &ybuf, &len);
  54                 size_t bytes_remaining = len - gs->yoff;
  55                 if (bytes_remaining > max) {
  56                         memcpy(buf, ybuf + gs->yoff, max);
  57                         gs->yoff += max;
  58                         return max;
  59                 } else {
  60                         memcpy(buf, ybuf + gs->yoff, bytes_remaining);
  61                         gs->yoff = 0;
  62                         yajl_gen_clear(gs->g);
  63                         return bytes_remaining;
  64                 }
  65         }
  66
  67         if (gs->done)
  68                 return -1;
  69
  70         if (pos == 0) { /* Start iterating */
  71                 yajl_gen_array_open(gs->g);
  72         }
  73
  74         /* Snarf one record */
  75         json_generate_one_record(gs->g, NULL, gs->b, gs->entries[gs->i]);
  76
  77         if (gs->i == 0) {
  78                 yajl_gen_array_close(gs->g);
  79                 gs->done = 1;
  80         }
  81         gs->i--;
  82
  83
  84         yajl_gen_get_buf(gs->g, &ybuf, &len);
  85         if (len > max) {
  86                 memcpy(buf, ybuf, max);
  87                 gs->yoff = max;
  88                 return max;
  89         } else {
  90                 memcpy(buf, ybuf, len);
  91                 yajl_gen_clear(gs->g);
  92                 return len;
  93         }
  94 }
  95
  96 void GET_generate_list_free(void *cls) {
  97         struct get_state *gs = cls;
  98
  99         blerg_close(gs->b);
 100         yajl_gen_free(gs->g);
 101         free(gs->entries);
 102         free(gs);
 103 }
 104
 105 ssize_t GET_generate_taglist(void *cls, uint64_t pos, char *buf, size_t max) {
 106         struct tag_state *ts = cls;
 107         struct blerg *b;
 108         const unsigned char *ybuf;
 109         unsigned int len;
 110
 111         if (ts->yoff > 0) {
 112                 yajl_gen_get_buf(ts->g, &ybuf, &len);
 113                 size_t bytes_remaining = len - ts->yoff;
 114                 if (bytes_remaining > max) {
 115                         memcpy(buf, ybuf + ts->yoff, max);
 116                         ts->yoff += max;
 117                         return max;
 118                 } else {
 119                         memcpy(buf, ybuf + ts->yoff, bytes_remaining);
 120                         ts->yoff = 0;
 121                         yajl_gen_clear(ts->g);
 122                         return bytes_remaining;
 123                 }
 124         }
 125
 126         if (ts->done)
 127                 return -1;
 128
 129         if (pos == 0) { /* Start iterating */
 130                 yajl_gen_array_open(ts->g);
 131         }
 132
 133         /* Snarf one record */
 134         b = blerg_open(ts->results[ts->i].author);
 135         if (b != NULL) {
 136                 json_generate_one_record(ts->g, ts->results[ts->i].author, b, ts->results[ts->i].record);
 137                 blerg_close(b);
 138         }
 139
 140         if (ts->i == 0) {
 141                 yajl_gen_array_close(ts->g);
 142                 ts->done = 1;
 143         }
 144
 145         ts->i--;
 146
 147         yajl_gen_get_buf(ts->g, &ybuf, &len);
 148         if (len > max) {
 149                 memcpy(buf, ybuf, max);
 150                 ts->yoff = max;
 151                 return max;
 152         } else {
 153                 memcpy(buf, ybuf, len);
 154                 yajl_gen_clear(ts->g);
 155                 return len;
 156         }
 157 }
 158
 159 void GET_generate_taglist_free(void *cls) {
 160         struct tag_state *ts = cls;
 161
 162         yajl_gen_free(ts->g);
 163         free(ts->results);
 164         free(ts);
 165 }
 166
 167 int POST_auth_iterator(void *cls, enum MHD_ValueKind kind, const char *key, const char *filename, const char *content_type, const char *transfer_encoding, const char *data, uint64_t off, size_t size) {
 168         struct auth_state *as = cls;
 169
 170         if (strncmp(key, "username", 9) == 0) {
 171                 if (size > 32) size = 32;
 172                 memcpy(as->username, data, size);
 173                 as->username[size] = 0;
 174         } else if (strncmp(key, "password", 9) == 0) {
 175                 if (size > 32) size = 32;
 176                 memcpy(as->password, data, size);
 177                 as->password[size] = 0;
 178         }
 179
 180         return MHD_YES;
 181 }
 182
 183 int POST_put_iterator(void *cls, enum MHD_ValueKind kind, const char *key, const char *filename, const char *content_type, const char *transfer_encoding, const char *data, uint64_t off, size_t size) {
 184         struct put_state *ps = cls;
 185
 186         if (strncmp(key, "data", 5) == 0) {
 187                 if (ps->data == NULL) {
 188                         ps->data_size = size;
 189                         ps->data = malloc(size);
 190                 } else {
 191                         if (ps->data_size + size > MAX_RECORD_SIZE) {
 192                                 size = MAX_RECORD_SIZE - ps->data_size;
 193                         }
 194                         ps->data_size += size;
 195                         ps->data = realloc(ps->data, ps->data_size);
 196                 }
 197                 memcpy(ps->data + off, data, size);
 198                 if (ps->data_size == MAX_RECORD_SIZE)
 199                         return MHD_NO;
 200         } else if (strncmp(key, "username", 9) == 0) {
 201                 if (size > 32) size = 32;
 202                 memcpy(ps->username, data, size);
 203                 ps->username[size] = 0;
 204         }
 205
 206         return MHD_YES;
 207 }
 208
 209 struct MHD_Response *create_response_for_range(struct blerg *b, uint64_t from, uint64_t to) {
 210         struct MHD_Response *response;
 211         struct get_state *gs = malloc(sizeof(struct get_state));
 212         gs->b = b;
 213
 214         uint64_t record_count = blerg_get_record_count(b);
 215
 216         if (from > to || from >= record_count || to >= record_count || to - from > 99) {
 217                 blerg_close(b);
 218                 free(gs);
 219                 return NULL;
 220         }
 221
 222         gs->entries = make_sequential_list(from, to);
 223         gs->i = to - from;
 224
 225         gs->g = yajl_gen_alloc(&yajl_c, NULL);
 226         gs->yoff = gs->done = 0;
 227
 228         response = MHD_create_response_from_callback(-1, 262144, &GET_generate_list, gs, &GET_generate_list_free);
 229
 230         return response;
 231 }
 232
 233 struct MHD_Response *create_tag_response(struct tag *results, uint64_t len) {
 234         struct tag_state *ts = malloc(sizeof(struct tag_state));
 235         ts->g = yajl_gen_alloc(&yajl_c, NULL);
 236         ts->results = results;
 237         ts->i = len - 1;
 238         ts->yoff = ts->done = 0;
 239
 240         return MHD_create_response_from_callback(-1, 262144, &GET_generate_taglist, ts, &GET_generate_taglist_free);
 241 }
 242
 243 static int
 244 ahc_derp (void *cls, struct MHD_Connection *connection, const char *url, const char *method,
 245           const char *version, const char *upload_data, size_t *upload_data_size, void **ptr) {
 246         struct MHD_Response *response;
 247         int ret, len;
 248         struct url_info info;
 249         char *data;
 250
 251         if (strncmp(url, "/get", 4) == 0 && strlen(url) > 4) {
 252                 if (*ptr == NULL) {
 253                         if (strcmp(method, MHD_HTTP_METHOD_GET) != 0)
 254                                 return respond_405(connection);
 255
 256                         *ptr = (void *) 1;
 257                         return MHD_YES;
 258                 }
 259
 260                 if (url[4] != '/')
 261                         return respond_404(connection);
 262
 263                 ret = parse_url_info(url + 5, &info);
 264                 if ((ret & URL_INFO_AUTHOR) == 0)
 265                         return respond_404(connection);
 266
 267                 if (!blerg_exists(info.author))
 268                         return respond_404(connection);
 269
 270                 *ptr == NULL;
 271
 272                 struct blerg *b = blerg_open(info.author);
 273
 274                 if ((ret & URL_INFO_RECORD) && (ret & URL_INFO_RECORD_TO)) {
 275                         response = create_response_for_range(b, info.record, info.record_to);
 276                 } else if (ret & URL_INFO_RECORD) {
 277                         ret = blerg_fetch(b, info.record, &data, &len);
 278                         blerg_close(b);
 279
 280                         if (ret == 0)
 281                                 return respond_404(connection);
 282                         response = MHD_create_response_from_data(len, data, MHD_YES, MHD_NO);
 283                 } else {
 284                         uint64_t record_count, from, to;
 285                         record_count = blerg_get_record_count(b);
 286                         if (record_count == 0) {
 287                                 blerg_close(b);
 288                                 response = MHD_create_response_from_data(2, "[]", MHD_NO, MHD_NO);
 289                         } else {
 290                                 to = record_count - 1;
 291                                 from = (record_count > 50 ? to - 49 : 0);
 292                                 response = create_response_for_range(b, from, to);
 293                         }
 294                 }
 295
 296                 if (response == NULL) {
 297                         blerg_close(b);
 298                         return respond_JSON_Failure(connection);
 299                 }
 300
 301                 ret = MHD_queue_response(connection, MHD_HTTP_OK, response);
 302                 MHD_destroy_response(response);
 303                 return ret;
 304         } else if (strncmp(url, "/tag", 4) == 0 && strlen(url) > 4) {
 305                 if (*ptr == NULL) {
 306                         if (strcmp(method, MHD_HTTP_METHOD_GET) != 0)
 307                                 return respond_405(connection);
 308
 309                         *ptr = (void *) 1;
 310                         return MHD_YES;
 311                 }
 312
 313                 if (url[4] != '/')
 314                         return respond_404(connection);
 315
 316                 ret = parse_url_info(url + 5, &info);
 317                 if ((ret & URL_INFO_AUTHOR) == 0)
 318                         return respond_404(connection);
 319
 320                 if (!tag_exists(info.author))
 321                         return respond_404(connection);
 322
 323                 int recs = 50;
 324                 struct tag *taglist = tag_list(info.author, 0, &recs, -1);
 325
 326                 if (recs == 0) {
 327                         response = MHD_create_response_from_data(2, "[]", MHD_NO, MHD_NO);
 328                 } else {
 329                         response = create_tag_response(taglist, recs);
 330                 }
 331
 332                 if (response == NULL)
 333                         return respond_JSON_Failure(connection);
 334
 335                 ret = MHD_queue_response(connection, MHD_HTTP_OK, response);
 336                 MHD_destroy_response(response);
 337
 338                 return ret;
 339         } else if (strncmp(url, "/put", 4) == 0) {
 340                 struct put_state *ps = (struct put_state *) *ptr;
 341                 if (*ptr == NULL) {
 342                         if (strcmp(method, MHD_HTTP_METHOD_POST) != 0)
 343                                 return respond_405(connection);
 344
 345                         if (url[4] == '/')
 346                                 return respond_404(connection);
 347
 348                         *ptr = (void *) 1;
 349
 350                         struct put_state *ps = malloc(sizeof(struct put_state));
 351                         ps->data = NULL;
 352                         ps->data_size = 0;
 353                         ps->pp = MHD_create_post_processor(connection, 16384, &POST_put_iterator, ps);
 354                         ps->username[0] = 0;
 355                         *ptr = ps;
 356                         return MHD_YES;
 357                 }
 358
 359                 if (*upload_data_size) {
 360                         MHD_post_process(ps->pp, upload_data, *upload_data_size);
 361                         *upload_data_size = 0;
 362                         return MHD_YES;
 363                 }
 364
 365                 if (ps->data == NULL || ps->data_size == 0 || ps->username[0] == 0)
 366                         return respond_JSON_Failure(connection);
 367
 368                 const char *given_token = MHD_lookup_connection_value(connection, MHD_COOKIE_KIND, "auth");
 369                 if (!auth_check_token(ps->username, given_token))
 370                         return respond_JSON_Failure(connection);
 371
 372                 struct blerg *b = blerg_open(ps->username);
 373                 if (b == NULL)
 374                         return respond_JSON_Failure(connection);
 375                 ret = blerg_store(b, ps->data, ps->data_size);
 376                 blerg_close(b);
 377                 if (ret == -1)
 378                         return respond_JSON_Failure(connection);
 379
 380                 MHD_destroy_post_processor(ps->pp);
 381                 free(ps->data);
 382                 free(ps);
 383                 *ptr = NULL;
 384
 385                 return respond_JSON_Success(connection);
 386         } else if (strncmp(url, "/info", 5) == 0) {
 387                 if (*ptr == NULL) {
 388                         *ptr = (void *) 1;
 389
 390                         if (strcmp(method, MHD_HTTP_METHOD_GET) != 0)
 391                                 return respond_405(connection);
 392                         return MHD_YES;
 393                 }
 394
 395
 396                 if (url[5] != '/')
 397                         return respond_404(connection);
 398
 399                 ret = parse_url_info(url + 6, &info);
 400                 if ((ret & URL_INFO_AUTHOR) == 0)
 401                         return respond_404(connection);
 402
 403                 if (!blerg_exists(info.author))
 404                         return respond_404(connection);
 405
 406                 *ptr == NULL;
 407
 408                 struct blerg *b = blerg_open(info.author);
 409                 uint64_t record_count = blerg_get_record_count(b);
 410                 blerg_close(b);
 411
 412                 char number[21];
 413                 yajl_gen g = yajl_gen_alloc(&yajl_c, NULL);
 414                 yajl_gen_map_open(g);
 415                 yajl_gen_string(g, "record_count", 12);
 416                 snprintf(number, 21, "%llu", record_count);
 417                 yajl_gen_string(g, number, strlen(number));
 418                 yajl_gen_map_close(g);
 419
 420                 const unsigned char *ybuf;
 421                 yajl_gen_get_buf(g, &ybuf, &len);
 422
 423                 response = MHD_create_response_from_data(len, (void *)ybuf, MHD_NO, MHD_YES);
 424                 ret = MHD_queue_response(connection, MHD_HTTP_OK, response);
 425                 MHD_destroy_response(response);
 426
 427                 yajl_gen_free(g);
 428
 429                 return ret;
 430         } else if (strncmp(url, "/create", 8) == 0) {
 431                 struct auth_state *as = (struct auth_state *) *ptr;
 432
 433                 if (as == NULL) {
 434                         if (strcmp(method, MHD_HTTP_METHOD_POST) != 0)
 435                                 return respond_405(connection);
 436
 437                         struct auth_state *as = malloc(sizeof(struct auth_state));
 438                         as->username[0] = as->password[0] = 0;
 439                         as->pp = MHD_create_post_processor(connection, 1024, &POST_auth_iterator, as);
 440                         *ptr = as;
 441                         return MHD_YES;
 442                 }
 443
 444                 if (*upload_data_size) {
 445                         MHD_post_process(as->pp, upload_data, *upload_data_size);
 446                         *upload_data_size = 0;
 447                         return MHD_YES;
 448                 }
 449
 450                 if (as->username[0] == 0 || as->password[0] == 0)
 451                         return respond_JSON_Failure(connection);
 452
 453                 if (blerg_exists(as->username))
 454                         return respond_JSON_Failure(connection);
 455
 456                 struct blerg *b = blerg_open(as->username);
 457                 blerg_close(b);
 458                 auth_set_password(as->username, as->password);
 459
 460                 MHD_destroy_post_processor(as->pp);
 461                 free(as);
 462                 *ptr = NULL;
 463
 464                 return respond_JSON_Success(connection);
 465         } else if (strncmp(url, "/login", 7) == 0) {
 466                 struct auth_state *as = (struct auth_state *) *ptr;
 467
 468                 if (as == NULL) {
 469                         if (strcmp(method, MHD_HTTP_METHOD_POST) != 0)
 470                                 return respond_405(connection);
 471
 472                         struct auth_state *as = malloc(sizeof(struct auth_state));
 473                         as->username[0] = as->password[0] = 0;
 474                         as->pp = MHD_create_post_processor(connection, 1024, &POST_auth_iterator, as);
 475                         *ptr = as;
 476                         return MHD_YES;
 477                 }
 478
 479                 if (*upload_data_size) {
 480                         MHD_post_process(as->pp, upload_data, *upload_data_size);
 481                         *upload_data_size = 0;
 482                         return MHD_YES;
 483                 }
 484
 485                 if (as->username[0] == 0 || as->password[0] == 0)
 486                         return respond_JSON_Failure(connection);
 487
 488                 if (!auth_login(as->username, as->password))
 489                         return respond_JSON_Failure(connection);
 490
 491                 response = MHD_create_response_from_data(strlen(JSON_SUCCESS), JSON_SUCCESS, MHD_NO, MHD_NO);
 492
 493                 char *token = auth_get_token(as->username);
 494                 data = malloc(512);
 495                 snprintf(data, 512, "auth=%s", token);
 496                 MHD_add_response_header(response, "Set-Cookie", data);
 497                 free(token);
 498                 free(data);
 499
 500                 MHD_destroy_post_processor(as->pp);
 501                 free(as);
 502                 *ptr = NULL;
 503
 504                 ret = MHD_queue_response(connection, MHD_HTTP_OK, response);
 505                 MHD_destroy_response(response);
 506
 507                 return ret;
 508         } else if (strncmp(url, "/logout", 8) == 0) {
 509                 struct auth_state *as = (struct auth_state *) *ptr;
 510
 511                 if (as == NULL) {
 512                         if (strcmp(method, MHD_HTTP_METHOD_POST) != 0)
 513                                 return respond_405(connection);
 514
 515                         struct auth_state *as = malloc(sizeof(struct auth_state));
 516                         as->username[0] = as->password[0] = 0;
 517                         as->pp = MHD_create_post_processor(connection, 1024, &POST_auth_iterator, as);
 518                         *ptr = as;
 519                         return MHD_YES;
 520                 }
 521
 522                 if (*upload_data_size) {
 523                         MHD_post_process(as->pp, upload_data, *upload_data_size);
 524                         *upload_data_size = 0;
 525                         return MHD_YES;
 526                 }
 527
 528                 const char *given_token = MHD_lookup_connection_value(connection, MHD_COOKIE_KIND, "auth");
 529                 if (auth_check_token(as->username, given_token)) {
 530                         auth_logout(as->username);
 531                         return respond_JSON_Success(connection);
 532                 } else {
 533                         return respond_JSON_Failure(connection);
 534                 }
 535         } else {
 536                 return respond_404(connection);
 537         }
 538 }
 539
 540
 541 int main(int argc, char *argv[]) {
 542         struct MHD_Daemon *daemon;
 543         fd_set rs, ws, es;
 544         int max;
 545
 546         init_responses();
 547
 548         daemon = MHD_start_daemon(MHD_USE_DEBUG, 8080, NULL, NULL, &ahc_derp, NULL, MHD_OPTION_END);
 549         if (daemon == NULL) {
 550                 fprintf(stderr, "Could not start web server\n");
 551                 return 1;
 552         }
 553
 554         while (1) {
 555                 FD_ZERO(&rs); FD_ZERO(&ws); FD_ZERO(&es);
 556                 if (MHD_get_fdset(daemon, &rs, &ws, &es, &max) != MHD_YES) {
 557                         fprintf(stderr, "Fatal error getting fd sets\n");
 558                         break;
 559                 }
 560                 select(max + 1, &rs, &ws, &es, NULL);
 561                 MHD_run(daemon);
 562         }
 563         MHD_stop_daemon(daemon);
 564         return 0;
 565 }