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 int parse_url_info(const char *url, struct url_info *info) {
  42         const char *c;
  43         int len;
  44         info->contents = 0;
  45
  46         c = strchr(url, '/');
  47         if (c == NULL) {
  48                 len = strlen(url);
  49         } else {
  50                 len = c - url;
  51         }
  52         if (len == 0)
  53                 return 0;
  54         memcpy(info->author, url, len);
  55         info->author[len] = 0;
  56         info->contents |= URL_INFO_AUTHOR;
  57
  58         if (c == NULL || c[1] == 0)
  59                 return info->contents;
  60
  61         info->record = strtoull(c + 1, NULL, 10);
  62         info->contents |= URL_INFO_RECORD;
  63
  64         c = strchr(c, '-');
  65         if (c == NULL || c[1] == 0)
  66                 return info->contents;
  67
  68         info->record_to = strtoull(c + 1, NULL, 10);
  69         info->contents |= URL_INFO_RECORD_TO;
  70
  71         return info->contents;
  72 }
  73
  74 uint64_t *make_sequential_list(uint64_t from, uint64_t to) {
  75         uint64_t len = to - from + 1;
  76         uint64_t *list = malloc(len * sizeof(uint64_t));
  77         uint64_t i;
  78
  79         for (i = 0; i < len; i++) {
  80                 list[i] = from + i;
  81         }
  82
  83         return list;
  84 }
  85
  86 ssize_t GET_generate_list(void *cls, uint64_t pos, char *buf, size_t max) {
  87         struct get_state *gs = cls;
  88         const unsigned char *ybuf;
  89         char *data;
  90         char number[21];
  91         unsigned int len;
  92
  93         if (gs->yoff > 0) {
  94                 yajl_gen_get_buf(gs->g, &ybuf, &len);
  95                 size_t bytes_remaining = len - gs->yoff;
  96                 if (bytes_remaining > max) {
  97                         memcpy(buf, ybuf + gs->yoff, max);
  98                         gs->yoff += max;
  99                         return max;
 100                 } else {
 101                         memcpy(buf, ybuf + gs->yoff, bytes_remaining);
 102                         gs->yoff = 0;
 103                         yajl_gen_clear(gs->g);
 104                         return bytes_remaining;
 105                 }
 106         }
 107
 108         if (gs->done)
 109                 return -1;
 110
 111         if (pos == 0) { /* Start iterating */
 112                 yajl_gen_array_open(gs->g);
 113         }
 114
 115         /* Snarf one record */
 116         blerg_fetch(gs->b, gs->entries[gs->i], &data, &len);
 117
 118         yajl_gen_map_open(gs->g);
 119         yajl_gen_string(gs->g, "record", 6);
 120         snprintf(number, 21, "%llu", gs->entries[gs->i]);
 121         yajl_gen_string(gs->g, number, strlen(number));
 122         yajl_gen_string(gs->g, "data", 4);
 123         yajl_gen_string(gs->g, data, len);
 124         yajl_gen_map_close(gs->g);
 125
 126         free(data);
 127         if (gs->i == 0) {
 128                 yajl_gen_array_close(gs->g);
 129                 gs->done = 1;
 130         }
 131         gs->i--;
 132
 133
 134         yajl_gen_get_buf(gs->g, &ybuf, &len);
 135         if (len > max) {
 136                 memcpy(buf, ybuf, max);
 137                 gs->yoff = max;
 138                 return max;
 139         } else {
 140                 memcpy(buf, ybuf, len);
 141                 yajl_gen_clear(gs->g);
 142                 return len;
 143         }
 144 }
 145
 146 void GET_generate_list_free(void *cls) {
 147         struct get_state *gs = cls;
 148
 149         blerg_close(gs->b);
 150         yajl_gen_free(gs->g);
 151         free(gs->entries);
 152         free(gs);
 153 }
 154
 155 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) {
 156         struct create_state *cs = cls;
 157
 158         if (strncmp(key, "username", 9) == 0) {
 159                 if (size > 32) size = 32;
 160                 memcpy(cs->username, data, size);
 161                 cs->username[size] = 0;
 162         } else if (strncmp(key, "password", 9) == 0) {
 163                 if (size > 32) size = 32;
 164                 memcpy(cs->password, data, size);
 165                 cs->password[size] = 0;
 166         }
 167
 168         return MHD_YES;
 169 }
 170
 171 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) {
 172         struct put_state *ps = cls;
 173
 174         if (strncmp(key, "data", 5) == 0) {
 175                 if (ps->data == NULL) {
 176                         ps->data_size = size;
 177                         ps->data = malloc(size);
 178                 } else {
 179                         if (ps->data_size + size > MAX_RECORD_SIZE) {
 180                                 size = MAX_RECORD_SIZE - ps->data_size;
 181                         }
 182                         ps->data_size += size;
 183                         ps->data = realloc(ps->data, ps->data_size);
 184                 }
 185                 memcpy(ps->data + off, data, size);
 186                 if (ps->data_size == MAX_RECORD_SIZE)
 187                         return MHD_NO;
 188         }
 189
 190         return MHD_YES;
 191 }
 192
 193 struct MHD_Response *create_response_for_range(struct blerg *b, uint64_t from, uint64_t to) {
 194         struct MHD_Response *response;
 195         struct get_state *gs = malloc(sizeof(struct get_state));
 196         gs->b = b;
 197
 198         uint64_t record_count = blerg_get_record_count(b);
 199
 200         if (from > to || from >= record_count || to >= record_count || to - from > 99) {
 201                 blerg_close(b);
 202                 free(gs);
 203                 return NULL;
 204         }
 205
 206         gs->entries = make_sequential_list(from, to);
 207         gs->i = to - from;
 208
 209         gs->g = yajl_gen_alloc(&yajl_c, NULL);
 210         gs->yoff = gs->done = 0;
 211
 212         response = MHD_create_response_from_callback(-1, 262144, &GET_generate_list, gs, &GET_generate_list_free);
 213
 214         return response;
 215 }
 216
 217 static int
 218 ahc_derp (void *cls, struct MHD_Connection *connection, const char *url, const char *method,
 219           const char *version, const char *upload_data, size_t *upload_data_size, void **ptr) {
 220         struct MHD_Response *response;
 221         int ret, len;
 222         struct url_info info;
 223         char *data;
 224
 225         if (strncmp(url, "/get", 4) == 0 && strlen(url) > 4) {
 226                 if (*ptr == NULL) {
 227                         if (strcmp(method, MHD_HTTP_METHOD_GET) != 0)
 228                                 return respond_405(connection);
 229
 230                         *ptr = (void *) 1;
 231                         return MHD_YES;
 232                 }
 233
 234                 if (url[4] != '/')
 235                         return respond_404(connection);
 236
 237                 ret = parse_url_info(url + 5, &info);
 238                 if ((ret & URL_INFO_AUTHOR) == 0)
 239                         return respond_404(connection);
 240
 241                 if (!blerg_exists(info.author))
 242                         return respond_404(connection);
 243
 244                 *ptr == NULL;
 245
 246                 struct blerg *b = blerg_open(info.author);
 247
 248                 if ((ret & URL_INFO_RECORD) && (ret & URL_INFO_RECORD_TO)) {
 249                         response = create_response_for_range(b, info.record, info.record_to);
 250                 } else if (ret & URL_INFO_RECORD) {
 251                         ret = blerg_fetch(b, info.record, &data, &len);
 252                         blerg_close(b);
 253
 254                         if (ret == 0)
 255                                 return respond_404(connection);
 256                         response = MHD_create_response_from_data(len, data, MHD_YES, MHD_NO);
 257                 } else {
 258                         uint64_t record_count, from, to;
 259                         record_count = blerg_get_record_count(b);
 260                         if (record_count == 0) {
 261                                 response = MHD_create_response_from_data(2, "[]", MHD_NO, MHD_NO);
 262                         } else {
 263                                 to = record_count - 1;
 264                                 from = (record_count > 50 ? to - 49 : 0);
 265                                 response = create_response_for_range(b, from, to);
 266                         }
 267                 }
 268
 269                 if (response == NULL)
 270                         return respond_JSON_Failure(connection);
 271
 272                 ret = MHD_queue_response(connection, MHD_HTTP_OK, response);
 273                 MHD_destroy_response(response);
 274                 return ret;
 275         } else if (strncmp(url, "/put", 4) == 0) {
 276                 struct put_state *ps = (struct put_state *) *ptr;
 277                 char *username;
 278                 char password[33];
 279
 280                 if (*ptr == NULL) {
 281                         if (strcmp(method, MHD_HTTP_METHOD_POST) != 0)
 282                                 return respond_405(connection);
 283
 284                         if (url[4] == '/')
 285                                 return respond_404(connection);
 286
 287                         *ptr = (void *) 1;
 288
 289                         username = MHD_digest_auth_get_username(connection);
 290                         if (username == NULL)
 291                                 return respond_401(connection, MHD_NO);
 292                         auth_get_password(username, password);
 293
 294                         ret = MHD_digest_auth_check(connection, REALM, username, password, 300);
 295                         free(username);
 296
 297                         if (ret == MHD_INVALID_NONCE || ret == MHD_NO)
 298                                 return respond_401(connection, (ret == MHD_INVALID_NONCE) ? MHD_YES : MHD_NO);
 299
 300                         struct put_state *ps = malloc(sizeof(struct put_state));
 301                         ps->data = NULL;
 302                         ps->data_size = 0;
 303                         ps->pp = MHD_create_post_processor(connection, 16384, &POST_put_iterator, ps);
 304                         *ptr = ps;
 305                         return MHD_YES;
 306                 }
 307
 308                 if (*upload_data_size) {
 309                         MHD_post_process(ps->pp, upload_data, *upload_data_size);
 310                         *upload_data_size = 0;
 311                         return MHD_YES;
 312                 }
 313
 314                 if (ps->data == NULL || ps->data_size == 0)
 315                         return respond_JSON_Failure(connection);
 316
 317                 username = MHD_digest_auth_get_username(connection);
 318                 struct blerg *b = blerg_open(username);
 319                 if (b == NULL)
 320                         return respond_JSON_Failure(connection);
 321                 if (blerg_store(b, ps->data, ps->data_size) == -1) {
 322                         blerg_close(b);
 323                         return respond_JSON_Failure(connection);
 324                 }
 325                 blerg_close(b);
 326
 327                 MHD_destroy_post_processor(ps->pp);
 328                 free(username);
 329                 free(ps->data);
 330                 free(ps);
 331                 *ptr = NULL;
 332
 333                 return respond_JSON_Success(connection);
 334         } else if (strncmp(url, "/info", 5) == 0) {
 335                 if (*ptr == NULL) {
 336                         *ptr = (void *) 1;
 337
 338                         if (strcmp(method, MHD_HTTP_METHOD_GET) != 0)
 339                                 return respond_405(connection);
 340                         return MHD_YES;
 341                 }
 342
 343
 344                 if (url[5] != '/')
 345                         return respond_404(connection);
 346
 347                 ret = parse_url_info(url + 6, &info);
 348                 if ((ret & URL_INFO_AUTHOR) == 0)
 349                         return respond_404(connection);
 350
 351                 if (!blerg_exists(info.author))
 352                         return respond_404(connection);
 353
 354                 *ptr == NULL;
 355
 356                 struct blerg *b = blerg_open(info.author);
 357                 uint64_t record_count = blerg_get_record_count(b);
 358                 blerg_close(b);
 359
 360                 char number[21];
 361                 yajl_gen g = yajl_gen_alloc(&yajl_c, NULL);
 362                 yajl_gen_map_open(g);
 363                 yajl_gen_string(g, "record_count", 12);
 364                 snprintf(number, 21, "%llu", record_count);
 365                 yajl_gen_string(g, number, strlen(number));
 366                 yajl_gen_map_close(g);
 367
 368                 const unsigned char *ybuf;
 369                 yajl_gen_get_buf(g, &ybuf, &len);
 370
 371                 response = MHD_create_response_from_data(len, (void *)ybuf, MHD_NO, MHD_YES);
 372                 ret = MHD_queue_response(connection, MHD_HTTP_OK, response);
 373                 MHD_destroy_response(response);
 374
 375                 yajl_gen_free(g);
 376
 377                 return ret;
 378         } else if (strncmp(url, "/create", 8) == 0) {
 379                 struct create_state *cs = (struct create_state *) *ptr;
 380
 381                 if (cs == NULL) {
 382                         if (strcmp(method, MHD_HTTP_METHOD_POST) != 0)
 383                                 return respond_405(connection);
 384
 385                         struct create_state *cs = malloc(sizeof(struct create_state));
 386                         cs->username[0] = cs->password[0] = 0;
 387                         cs->pp = MHD_create_post_processor(connection, 1024, &POST_create_iterator, cs);
 388                         *ptr = cs;
 389                         return MHD_YES;
 390                 }
 391
 392                 if (*upload_data_size) {
 393                         MHD_post_process(cs->pp, upload_data, *upload_data_size);
 394                         *upload_data_size = 0;
 395                         return MHD_YES;
 396                 }
 397
 398                 if (cs->username[0] == 0 || cs->password[0] == 0)
 399                         return respond_JSON_Failure(connection);
 400
 401                 if (blerg_exists(cs->username))
 402                         return respond_JSON_Failure(connection);
 403
 404                 struct blerg *b = blerg_open(cs->username);
 405                 blerg_close(b);
 406                 auth_set_password(cs->username, cs->password);
 407
 408                 MHD_destroy_post_processor(cs->pp);
 409                 free(cs);
 410                 *ptr = NULL;
 411
 412                 return respond_JSON_Success(connection);
 413         } else {
 414                 return respond_404(connection);
 415         }
 416 }
 417
 418
 419 int main(int argc, char *argv[]) {
 420         struct MHD_Daemon *daemon;
 421         fd_set rs, ws, es;
 422         int max;
 423
 424         init_responses();
 425
 426         daemon = MHD_start_daemon(MHD_USE_DEBUG, 8080, NULL, NULL, &ahc_derp, NULL, MHD_OPTION_END);
 427         if (daemon == NULL) {
 428                 fprintf(stderr, "Could not start web server\n");
 429                 return 1;
 430         }
 431
 432         while (1) {
 433                 FD_ZERO(&rs); FD_ZERO(&ws); FD_ZERO(&es);
 434                 if (MHD_get_fdset(daemon, &rs, &ws, &es, &max) != MHD_YES) {
 435                         fprintf(stderr, "Fatal error getting fd sets\n");
 436                         break;
 437                 }
 438                 select(max + 1, &rs, &ws, &es, NULL);
 439                 MHD_run(daemon);
 440         }
 441         MHD_stop_daemon(daemon);
 442         return 0;
 443 }