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 "http.h"
  11 #include "config.h"
  12
  13 #define URL_INFO_AUTHOR    0x1
  14 #define URL_INFO_RECORD    0x2
  15 #define URL_INFO_RECORD_TO 0x4
  16 #define DERP "DERP DERP DERP"
  17
  18 yajl_gen_config yajl_c = { 0, 0 };
  19
  20 struct create_state {
  21         struct MHD_PostProcessor *pp;
  22         char username[33];
  23         char password[33];
  24 };
  25
  26 struct put_state {
  27         struct MHD_PostProcessor *pp;
  28         char *data;
  29         int data_size;
  30 };
  31
  32 struct get_state {
  33         struct blerg *b;
  34         yajl_gen g;
  35         unsigned int yoff;
  36         uint64_t *entries;
  37         uint64_t i;
  38         int done;
  39 };
  40
  41 struct tag_state {
  42         yajl_gen g;
  43         unsigned int yoff;
  44         struct tag *results;
  45         uint64_t i;
  46         int done;
  47 };
  48
  49 int parse_url_info(const char *url, struct url_info *info) {
  50         const char *c;
  51         int len;
  52         info->contents = 0;
  53
  54         c = strchr(url, '/');
  55         if (c == NULL) {
  56                 len = strlen(url);
  57         } else {
  58                 len = c - url;
  59         }
  60         if (len == 0)
  61                 return 0;
  62         memcpy(info->author, url, len);
  63         info->author[len] = 0;
  64         info->contents |= URL_INFO_AUTHOR;
  65
  66         if (c == NULL || c[1] == 0)
  67                 return info->contents;
  68
  69         info->record = strtoull(c + 1, NULL, 10);
  70         info->contents |= URL_INFO_RECORD;
  71
  72         c = strchr(c, '-');
  73         if (c == NULL || c[1] == 0)
  74                 return info->contents;
  75
  76         info->record_to = strtoull(c + 1, NULL, 10);
  77         info->contents |= URL_INFO_RECORD_TO;
  78
  79         return info->contents;
  80 }
  81
  82 uint64_t *make_sequential_list(uint64_t from, uint64_t to) {
  83         uint64_t len = to - from + 1;
  84         uint64_t *list = malloc(len * sizeof(uint64_t));
  85         uint64_t i;
  86
  87         for (i = 0; i < len; i++) {
  88                 list[i] = from + i;
  89         }
  90
  91         return list;
  92 }
  93
  94 void json_generate_one_record(yajl_gen g, const char *author, struct blerg *b, uint64_t record) {
  95         char *data;
  96         char number[21];
  97         int len;
  98
  99         if (!blerg_fetch(b, record, &data, &len)) {
 100                 fprintf(stderr, "Could not fetch record\n");
 101                 return;
 102         }
 103
 104         yajl_gen_map_open(g);
 105         if (author != NULL) {
 106                 yajl_gen_string(g, "author", 6);
 107                 yajl_gen_string(g, author, strlen(author));
 108         }
 109         yajl_gen_string(g, "record", 6);
 110         snprintf(number, 21, "%llu", record);
 111         yajl_gen_string(g, number, strlen(number));
 112         yajl_gen_string(g, "timestamp", 9);
 113         yajl_gen_integer(g, blerg_get_timestamp(b, record));
 114         yajl_gen_string(g, "data", 4);
 115         yajl_gen_string(g, data, len);
 116         yajl_gen_map_close(g);
 117
 118         free(data);
 119 }
 120
 121 ssize_t GET_generate_list(void *cls, uint64_t pos, char *buf, size_t max) {
 122         struct get_state *gs = cls;
 123         const unsigned char *ybuf;
 124         char *data;
 125         char number[21];
 126         unsigned int len;
 127
 128         if (gs->yoff > 0) {
 129                 yajl_gen_get_buf(gs->g, &ybuf, &len);
 130                 size_t bytes_remaining = len - gs->yoff;
 131                 if (bytes_remaining > max) {
 132                         memcpy(buf, ybuf + gs->yoff, max);
 133                         gs->yoff += max;
 134                         return max;
 135                 } else {
 136                         memcpy(buf, ybuf + gs->yoff, bytes_remaining);
 137                         gs->yoff = 0;
 138                         yajl_gen_clear(gs->g);
 139                         return bytes_remaining;
 140                 }
 141         }
 142
 143         if (gs->done)
 144                 return -1;
 145
 146         if (pos == 0) { /* Start iterating */
 147                 yajl_gen_array_open(gs->g);
 148         }
 149
 150         /* Snarf one record */
 151         json_generate_one_record(gs->g, NULL, gs->b, gs->entries[gs->i]);
 152
 153         if (gs->i == 0) {
 154                 yajl_gen_array_close(gs->g);
 155                 gs->done = 1;
 156         }
 157         gs->i--;
 158
 159
 160         yajl_gen_get_buf(gs->g, &ybuf, &len);
 161         if (len > max) {
 162                 memcpy(buf, ybuf, max);
 163                 gs->yoff = max;
 164                 return max;
 165         } else {
 166                 memcpy(buf, ybuf, len);
 167                 yajl_gen_clear(gs->g);
 168                 return len;
 169         }
 170 }
 171
 172 void GET_generate_list_free(void *cls) {
 173         struct get_state *gs = cls;
 174
 175         blerg_close(gs->b);
 176         yajl_gen_free(gs->g);
 177         free(gs->entries);
 178         free(gs);
 179 }
 180
 181 ssize_t GET_generate_taglist(void *cls, uint64_t pos, char *buf, size_t max) {
 182         struct tag_state *ts = cls;
 183         struct blerg *b;
 184         const unsigned char *ybuf;
 185         unsigned int len;
 186
 187         if (ts->yoff > 0) {
 188                 yajl_gen_get_buf(ts->g, &ybuf, &len);
 189                 size_t bytes_remaining = len - ts->yoff;
 190                 if (bytes_remaining > max) {
 191                         memcpy(buf, ybuf + ts->yoff, max);
 192                         ts->yoff += max;
 193                         return max;
 194                 } else {
 195                         memcpy(buf, ybuf + ts->yoff, bytes_remaining);
 196                         ts->yoff = 0;
 197                         yajl_gen_clear(ts->g);
 198                         return bytes_remaining;
 199                 }
 200         }
 201
 202         if (ts->done)
 203                 return -1;
 204
 205         if (pos == 0) { /* Start iterating */
 206                 yajl_gen_array_open(ts->g);
 207         }
 208
 209         /* Snarf one record */
 210         b = blerg_open(ts->results[ts->i].author);
 211         if (b == NULL)
 212                 goto skip_bad_blerg;
 213
 214         json_generate_one_record(ts->g, ts->results[ts->i].author, b, ts->results[ts->i].record);
 215
 216         blerg_close(b);
 217
 218 skip_bad_blerg:
 219         if (ts->i == 0) {
 220                 yajl_gen_array_close(ts->g);
 221                 ts->done = 1;
 222         }
 223
 224         ts->i--;
 225
 226         yajl_gen_get_buf(ts->g, &ybuf, &len);
 227         if (len > max) {
 228                 memcpy(buf, ybuf, max);
 229                 ts->yoff = max;
 230                 return max;
 231         } else {
 232                 memcpy(buf, ybuf, len);
 233                 yajl_gen_clear(ts->g);
 234                 return len;
 235         }
 236 }
 237
 238 void GET_generate_taglist_free(void *cls) {
 239         struct tag_state *ts = cls;
 240
 241         yajl_gen_free(ts->g);
 242         free(ts->results);
 243         free(ts);
 244 }
 245
 246 int POST_create_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) {
 247         struct create_state *cs = cls;
 248
 249         if (strncmp(key, "username", 9) == 0) {
 250                 if (size > 32) size = 32;
 251                 memcpy(cs->username, data, size);
 252                 cs->username[size] = 0;
 253         } else if (strncmp(key, "password", 9) == 0) {
 254                 if (size > 32) size = 32;
 255                 memcpy(cs->password, data, size);
 256                 cs->password[size] = 0;
 257         }
 258
 259         return MHD_YES;
 260 }
 261
 262 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) {
 263         struct put_state *ps = cls;
 264
 265         if (strncmp(key, "data", 5) == 0) {
 266                 if (ps->data == NULL) {
 267                         ps->data_size = size;
 268                         ps->data = malloc(size);
 269                 } else {
 270                         if (ps->data_size + size > MAX_RECORD_SIZE) {
 271                                 size = MAX_RECORD_SIZE - ps->data_size;
 272                         }
 273                         ps->data_size += size;
 274                         ps->data = realloc(ps->data, ps->data_size);
 275                 }
 276                 memcpy(ps->data + off, data, size);
 277                 if (ps->data_size == MAX_RECORD_SIZE)
 278                         return MHD_NO;
 279         }
 280
 281         return MHD_YES;
 282 }
 283
 284 struct MHD_Response *create_response_for_range(struct blerg *b, uint64_t from, uint64_t to) {
 285         struct MHD_Response *response;
 286         struct get_state *gs = malloc(sizeof(struct get_state));
 287         gs->b = b;
 288
 289         uint64_t record_count = blerg_get_record_count(b);
 290
 291         if (from > to || from >= record_count || to >= record_count || to - from > 99) {
 292                 blerg_close(b);
 293                 free(gs);
 294                 return NULL;
 295         }
 296
 297         gs->entries = make_sequential_list(from, to);
 298         gs->i = to - from;
 299
 300         gs->g = yajl_gen_alloc(&yajl_c, NULL);
 301         gs->yoff = gs->done = 0;
 302
 303         response = MHD_create_response_from_callback(-1, 262144, &GET_generate_list, gs, &GET_generate_list_free);
 304
 305         return response;
 306 }
 307
 308 struct MHD_Response *create_tag_response(struct tag *results, uint64_t len) {
 309         struct tag_state *ts = malloc(sizeof(struct tag_state));
 310         ts->g = yajl_gen_alloc(&yajl_c, NULL);
 311         ts->results = results;
 312         ts->i = len - 1;
 313         ts->yoff = ts->done = 0;
 314
 315         return MHD_create_response_from_callback(-1, 262144, &GET_generate_taglist, ts, &GET_generate_taglist_free);
 316 }
 317
 318 static int
 319 ahc_derp (void *cls, struct MHD_Connection *connection, const char *url, const char *method,
 320           const char *version, const char *upload_data, size_t *upload_data_size, void **ptr) {
 321         struct MHD_Response *response;
 322         int ret, len;
 323         struct url_info info;
 324         char *data;
 325
 326         if (strncmp(url, "/get", 4) == 0 && strlen(url) > 4) {
 327                 if (*ptr == NULL) {
 328                         if (strcmp(method, MHD_HTTP_METHOD_GET) != 0)
 329                                 return respond_405(connection);
 330
 331                         *ptr = (void *) 1;
 332                         return MHD_YES;
 333                 }
 334
 335                 if (url[4] != '/')
 336                         return respond_404(connection);
 337
 338                 ret = parse_url_info(url + 5, &info);
 339                 if ((ret & URL_INFO_AUTHOR) == 0)
 340                         return respond_404(connection);
 341
 342                 if (!blerg_exists(info.author))
 343                         return respond_404(connection);
 344
 345                 *ptr == NULL;
 346
 347                 struct blerg *b = blerg_open(info.author);
 348
 349                 if ((ret & URL_INFO_RECORD) && (ret & URL_INFO_RECORD_TO)) {
 350                         response = create_response_for_range(b, info.record, info.record_to);
 351                 } else if (ret & URL_INFO_RECORD) {
 352                         ret = blerg_fetch(b, info.record, &data, &len);
 353                         blerg_close(b);
 354
 355                         if (ret == 0)
 356                                 return respond_404(connection);
 357                         response = MHD_create_response_from_data(len, data, MHD_YES, MHD_NO);
 358                 } else {
 359                         uint64_t record_count, from, to;
 360                         record_count = blerg_get_record_count(b);
 361                         if (record_count == 0) {
 362                                 blerg_close(b);
 363                                 response = MHD_create_response_from_data(2, "[]", MHD_NO, MHD_NO);
 364                         } else {
 365                                 to = record_count - 1;
 366                                 from = (record_count > 50 ? to - 49 : 0);
 367                                 response = create_response_for_range(b, from, to);
 368                         }
 369                 }
 370
 371                 if (response == NULL) {
 372                         blerg_close(b);
 373                         return respond_JSON_Failure(connection);
 374                 }
 375
 376                 ret = MHD_queue_response(connection, MHD_HTTP_OK, response);
 377                 MHD_destroy_response(response);
 378                 return ret;
 379         } else if (strncmp(url, "/tag", 4) == 0 && strlen(url) > 4) {
 380                 if (*ptr == NULL) {
 381                         if (strcmp(method, MHD_HTTP_METHOD_GET) != 0)
 382                                 return respond_405(connection);
 383
 384                         *ptr = (void *) 1;
 385                         return MHD_YES;
 386                 }
 387
 388                 if (url[4] != '/')
 389                         return respond_404(connection);
 390
 391                 ret = parse_url_info(url + 5, &info);
 392                 if ((ret & URL_INFO_AUTHOR) == 0)
 393                         return respond_404(connection);
 394
 395                 if (!tag_exists(info.author))
 396                         return respond_404(connection);
 397
 398                 uint64_t recs = 50;
 399                 struct tag *taglist = tag_list(info.author, 0, &recs, -1);
 400
 401                 if (recs == 0) {
 402                         response = MHD_create_response_from_data(2, "[]", MHD_NO, MHD_NO);
 403                 } else {
 404                         response = create_tag_response(taglist, recs);
 405                 }
 406
 407                 if (response == NULL)
 408                         return respond_JSON_Failure(connection);
 409
 410                 ret = MHD_queue_response(connection, MHD_HTTP_OK, response);
 411                 MHD_destroy_response(response);
 412
 413                 return ret;
 414         } else if (strncmp(url, "/put", 4) == 0) {
 415                 struct put_state *ps = (struct put_state *) *ptr;
 416                 char *username;
 417                 char password[33];
 418
 419                 if (*ptr == NULL) {
 420                         if (strcmp(method, MHD_HTTP_METHOD_POST) != 0)
 421                                 return respond_405(connection);
 422
 423                         if (url[4] == '/')
 424                                 return respond_404(connection);
 425
 426                         *ptr = (void *) 1;
 427
 428                         username = MHD_digest_auth_get_username(connection);
 429                         if (username == NULL)
 430                                 return respond_401(connection, MHD_NO);
 431                         auth_get_password(username, password);
 432
 433                         ret = MHD_digest_auth_check(connection, REALM, username, password, 300);
 434                         free(username);
 435
 436                         if (ret == MHD_INVALID_NONCE || ret == MHD_NO)
 437                                 return respond_401(connection, (ret == MHD_INVALID_NONCE) ? MHD_YES : MHD_NO);
 438
 439                         struct put_state *ps = malloc(sizeof(struct put_state));
 440                         ps->data = NULL;
 441                         ps->data_size = 0;
 442                         ps->pp = MHD_create_post_processor(connection, 16384, &POST_put_iterator, ps);
 443                         *ptr = ps;
 444                         return MHD_YES;
 445                 }
 446
 447                 if (*upload_data_size) {
 448                         MHD_post_process(ps->pp, upload_data, *upload_data_size);
 449                         *upload_data_size = 0;
 450                         return MHD_YES;
 451                 }
 452
 453                 if (ps->data == NULL || ps->data_size == 0)
 454                         return respond_JSON_Failure(connection);
 455
 456                 username = MHD_digest_auth_get_username(connection);
 457                 struct blerg *b = blerg_open(username);
 458                 if (b == NULL)
 459                         return respond_JSON_Failure(connection);
 460                 if (blerg_store(b, ps->data, ps->data_size) == -1) {
 461                         blerg_close(b);
 462                         return respond_JSON_Failure(connection);
 463                 }
 464                 blerg_close(b);
 465
 466                 MHD_destroy_post_processor(ps->pp);
 467                 free(username);
 468                 free(ps->data);
 469                 free(ps);
 470                 *ptr = NULL;
 471
 472                 return respond_JSON_Success(connection);
 473         } else if (strncmp(url, "/info", 5) == 0) {
 474                 if (*ptr == NULL) {
 475                         *ptr = (void *) 1;
 476
 477                         if (strcmp(method, MHD_HTTP_METHOD_GET) != 0)
 478                                 return respond_405(connection);
 479                         return MHD_YES;
 480                 }
 481
 482
 483                 if (url[5] != '/')
 484                         return respond_404(connection);
 485
 486                 ret = parse_url_info(url + 6, &info);
 487                 if ((ret & URL_INFO_AUTHOR) == 0)
 488                         return respond_404(connection);
 489
 490                 if (!blerg_exists(info.author))
 491                         return respond_404(connection);
 492
 493                 *ptr == NULL;
 494
 495                 struct blerg *b = blerg_open(info.author);
 496                 uint64_t record_count = blerg_get_record_count(b);
 497                 blerg_close(b);
 498
 499                 char number[21];
 500                 yajl_gen g = yajl_gen_alloc(&yajl_c, NULL);
 501                 yajl_gen_map_open(g);
 502                 yajl_gen_string(g, "record_count", 12);
 503                 snprintf(number, 21, "%llu", record_count);
 504                 yajl_gen_string(g, number, strlen(number));
 505                 yajl_gen_map_close(g);
 506
 507                 const unsigned char *ybuf;
 508                 yajl_gen_get_buf(g, &ybuf, &len);
 509
 510                 response = MHD_create_response_from_data(len, (void *)ybuf, MHD_NO, MHD_YES);
 511                 ret = MHD_queue_response(connection, MHD_HTTP_OK, response);
 512                 MHD_destroy_response(response);
 513
 514                 yajl_gen_free(g);
 515
 516                 return ret;
 517         } else if (strncmp(url, "/create", 8) == 0) {
 518                 struct create_state *cs = (struct create_state *) *ptr;
 519
 520                 if (cs == NULL) {
 521                         if (strcmp(method, MHD_HTTP_METHOD_POST) != 0)
 522                                 return respond_405(connection);
 523
 524                         struct create_state *cs = malloc(sizeof(struct create_state));
 525                         cs->username[0] = cs->password[0] = 0;
 526                         cs->pp = MHD_create_post_processor(connection, 1024, &POST_create_iterator, cs);
 527                         *ptr = cs;
 528                         return MHD_YES;
 529                 }
 530
 531                 if (*upload_data_size) {
 532                         MHD_post_process(cs->pp, upload_data, *upload_data_size);
 533                         *upload_data_size = 0;
 534                         return MHD_YES;
 535                 }
 536
 537                 if (cs->username[0] == 0 || cs->password[0] == 0)
 538                         return respond_JSON_Failure(connection);
 539
 540                 if (blerg_exists(cs->username))
 541                         return respond_JSON_Failure(connection);
 542
 543                 struct blerg *b = blerg_open(cs->username);
 544                 blerg_close(b);
 545                 auth_set_password(cs->username, cs->password);
 546
 547                 MHD_destroy_post_processor(cs->pp);
 548                 free(cs);
 549                 *ptr = NULL;
 550
 551                 return respond_JSON_Success(connection);
 552         } else {
 553                 return respond_404(connection);
 554         }
 555 }
 556
 557
 558 int main(int argc, char *argv[]) {
 559         struct MHD_Daemon *daemon;
 560         fd_set rs, ws, es;
 561         int max;
 562
 563         init_responses();
 564
 565         daemon = MHD_start_daemon(MHD_USE_DEBUG, 8080, NULL, NULL, &ahc_derp, NULL, MHD_OPTION_END);
 566         if (daemon == NULL) {
 567                 fprintf(stderr, "Could not start web server\n");
 568                 return 1;
 569         }
 570
 571         while (1) {
 572                 FD_ZERO(&rs); FD_ZERO(&ws); FD_ZERO(&es);
 573                 if (MHD_get_fdset(daemon, &rs, &ws, &es, &max) != MHD_YES) {
 574                         fprintf(stderr, "Fatal error getting fd sets\n");
 575                         break;
 576                 }
 577                 select(max + 1, &rs, &ws, &es, NULL);
 578                 MHD_run(daemon);
 579         }
 580         MHD_stop_daemon(daemon);
 581         return 0;
 582 }