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