http_blerg.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <string.h>
   4 #include <microhttpd.h>
   5 #include "database.h"
   6 #include "tags.h"
   7 #include "auth.h"
   8
   9 #define URL_INFO_AUTHOR 0x1
  10 #define URL_INFO_RECORD 0x2
  11 #define DERP "DERP DERP DERP"
  12
  13 struct create_state {
  14         struct MHD_PostProcessor *pp;
  15         char username[33];
  16         char password[33];
  17 };
  18
  19 struct put_state {
  20         struct MHD_PostProcessor *pp;
  21         char *data;
  22         int data_size;
  23 };
  24
  25 struct MHD_Response *response_401;
  26 struct MHD_Response *response_404;
  27 struct MHD_Response *response_405;
  28 struct MHD_Response *response_JSON_Success;
  29 struct MHD_Response *response_JSON_Failure;
  30
  31 void init_responses() {
  32 #define CONTENT_401 "<html><head><title>401 Unauthorized</title></head><body><h1>401 Unauthorized</h1>DENIED</body></html>"
  33         response_401 = MHD_create_response_from_data(strlen (CONTENT_401), CONTENT_401, MHD_NO, MHD_NO);
  34
  35 #define CONTENT_404 "<html><head><title>404 Not Found</title></head><body><h1>404 Not Found</h1>I couldn't find that.</body></html>"
  36         response_404 = MHD_create_response_from_data(strlen(CONTENT_404), CONTENT_404, MHD_NO, MHD_NO);
  37
  38 #define CONTENT_405 "<html><head><title>405 Method Not Allowed</title></head><body><h1>405 Method Not Allowed</h1>I'm sorry, Dave. I'm afraid I can't do that.</body></html>"
  39         response_405 = MHD_create_response_from_data(strlen(CONTENT_405), CONTENT_405, MHD_NO, MHD_NO);
  40
  41 #define JSON_SUCCESS "{status: \"success\"}"
  42         response_JSON_Success = MHD_create_response_from_data(strlen(JSON_SUCCESS), JSON_SUCCESS, MHD_NO, MHD_NO);
  43
  44 #define JSON_FAILURE "{status: \"failure\"}"
  45         response_JSON_Failure = MHD_create_response_from_data(strlen(JSON_FAILURE), JSON_FAILURE, MHD_NO, MHD_NO);
  46 }
  47
  48 #define REALM "Blerg"
  49 #define OPAQUE "d29fb6db8f21a6e99903651a9f87470e"
  50 int respond_401(struct MHD_Connection *connection, int signal_stale) {
  51         return MHD_queue_auth_fail_response(connection, REALM, OPAQUE, response_401, signal_stale);
  52 }
  53
  54 int respond_404(struct MHD_Connection *connection) {
  55         return MHD_queue_response(connection, MHD_HTTP_NOT_FOUND, response_404);
  56 }
  57
  58 int respond_405(struct MHD_Connection *connection) {
  59         return MHD_queue_response(connection, MHD_HTTP_METHOD_NOT_ALLOWED, response_405);
  60 }
  61
  62 int respond_JSON_Success(struct MHD_Connection *connection) {
  63         return MHD_queue_response(connection, MHD_HTTP_OK, response_JSON_Success);
  64 }
  65
  66 int respond_JSON_Failure(struct MHD_Connection *connection) {
  67         return MHD_queue_response(connection, MHD_HTTP_OK, response_JSON_Failure);
  68 }
  69
  70 int parse_url_info(const char *url, char *author, uint64_t *record) {
  71         const char *c;
  72         int ret = 0;
  73         int len;
  74
  75         c = strchr(url, '/');
  76         if (c == NULL) {
  77                 len = strlen(url);
  78         } else {
  79                 len = c - url;
  80         }
  81         if (len == 0)
  82                 return 0;
  83         memcpy(author, url, len);
  84         author[len] = 0;
  85         ret |= URL_INFO_AUTHOR;
  86
  87         if (c != NULL && c[1] != 0) {
  88                 *record = strtoull(c + 1, NULL, 10);
  89                 ret |= URL_INFO_RECORD;
  90         }
  91
  92         return ret;
  93 }
  94
  95 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) {
  96         struct create_state *cs = cls;
  97
  98         if (strncmp(key, "username", 9) == 0) {
  99                 if (size > 32) size = 32;
 100                 memcpy(cs->username, data, size);
 101                 cs->username[size] = 0;
 102         } else if (strncmp(key, "password", 9) == 0) {
 103                 if (size > 32) size = 32;
 104                 memcpy(cs->password, data, size);
 105                 cs->password[size] = 0;
 106         }
 107
 108         return MHD_YES;
 109 }
 110
 111 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) {
 112         struct put_state *ps = cls;
 113
 114         if (strncmp(key, "data", 5) == 0) {
 115                 ps->data_size = size;
 116                 ps->data = malloc(size);
 117                 memcpy(ps->data, data, size);
 118                 return MHD_NO;
 119         }
 120
 121         return MHD_YES;
 122 }
 123
 124 static int
 125 ahc_derp (void *cls, struct MHD_Connection *connection, const char *url, const char *method,
 126           const char *version, const char *upload_data, size_t *upload_data_size, void **ptr) {
 127         struct MHD_Response *response;
 128         int ret, len;
 129         char author[33];
 130         uint64_t record;
 131         char *data;
 132
 133         if (strncmp(url, "/get", 4) == 0 && strlen(url) > 4) {
 134                 if (strcmp(method, MHD_HTTP_METHOD_GET) != 0)
 135                         return MHD_NO;
 136                 if (url[4] != '/')
 137                         return respond_404(connection);
 138                 ret = parse_url_info(url + 5, author, &record);
 139                 if ((ret & URL_INFO_AUTHOR) == 0)
 140                         return respond_404(connection);
 141
 142                 if (!blerg_exists(author))
 143                         return respond_404(connection);
 144
 145                 if (ret & URL_INFO_RECORD) {
 146                         if (*ptr == NULL) {
 147                                 *ptr = (void *) 1;
 148                                 return MHD_YES;
 149                         } else {
 150                                 *ptr == NULL;
 151
 152                                 struct blerg *b = blerg_open(author);
 153                                 ret = blerg_fetch(b, record, &data, &len);
 154                                 blerg_close(b);
 155
 156                                 if (ret == 0) {
 157                                         return respond_404(connection);
 158                                 } else {
 159                                         response = MHD_create_response_from_data(len, data, MHD_YES, MHD_NO);
 160                                         ret = MHD_queue_response(connection, MHD_HTTP_OK, response);
 161                                 }
 162                                 MHD_destroy_response(response);
 163                                 return ret;
 164                         }
 165                 } else {
 166                         if (*ptr == NULL) {
 167                                 *ptr = (void*) 1;
 168                                 return MHD_YES;
 169                         } else {
 170                                 *ptr == NULL;
 171                                 response = MHD_create_response_from_data(strlen(DERP), DERP, MHD_NO, MHD_NO);
 172                                 ret = MHD_queue_response(connection, MHD_HTTP_OK, response);
 173                                 MHD_destroy_response(response);
 174                                 return ret;
 175                         }
 176                 }
 177         } else if (strncmp(url, "/put", 4) == 0) {
 178                 struct put_state *ps = (struct put_state *) *ptr;
 179                 char *username;
 180                 char password[33];
 181
 182                 if (*ptr == NULL) {
 183                         if (strcmp(method, MHD_HTTP_METHOD_POST) != 0)
 184                                 return respond_405(connection);
 185
 186                         if (url[4] == '/')
 187                                 return respond_404(connection);
 188
 189                         *ptr = (void *) 1;
 190
 191                         username = MHD_digest_auth_get_username(connection);
 192                         if (username == NULL)
 193                                 return respond_401(connection, MHD_NO);
 194                         auth_get_password(username, password);
 195
 196                         ret = MHD_digest_auth_check(connection, REALM, username, password, 300);
 197                         free(username);
 198
 199                         if (ret == MHD_INVALID_NONCE || ret == MHD_NO)
 200                                 return respond_401(connection, (ret == MHD_INVALID_NONCE) ? MHD_YES : MHD_NO);
 201
 202                         struct put_state *ps = malloc(sizeof(struct put_state));
 203                         ps->data = NULL;
 204                         ps->pp = MHD_create_post_processor(connection, 4096, &POST_put_iterator, ps);
 205                         *ptr = ps;
 206                         return MHD_YES;
 207                 }
 208
 209                 if (*upload_data_size) {
 210                         MHD_post_process(ps->pp, upload_data, *upload_data_size);
 211                         *upload_data_size = 0;
 212                         return MHD_YES;
 213                 }
 214
 215                 if (ps->data == NULL || ps->data_size == 0)
 216                         return respond_JSON_Failure(connection);
 217
 218                 username = MHD_digest_auth_get_username(connection);
 219                 struct blerg *b = blerg_open(username);
 220                 if (b == NULL)
 221                         return respond_JSON_Failure(connection);
 222                 if (blerg_store(b, ps->data, ps->data_size) == -1) {
 223                         blerg_close(b);
 224                         return respond_JSON_Failure(connection);
 225                 }
 226                 blerg_close(b);
 227
 228                 MHD_destroy_post_processor(ps->pp);
 229                 free(username);
 230                 free(ps->data);
 231                 free(ps);
 232                 *ptr = NULL;
 233
 234                 return respond_JSON_Success(connection);
 235         } else if (strncmp(url, "/create", 8) == 0) {
 236                 struct create_state *cs = (struct create_state *) *ptr;
 237
 238                 if (cs == NULL) {
 239                         if (strcmp(method, MHD_HTTP_METHOD_POST) != 0)
 240                                 return respond_405(connection);
 241
 242                         struct create_state *cs = malloc(sizeof(struct create_state));
 243                         cs->username[0] = cs->password[0] = 0;
 244                         cs->pp = MHD_create_post_processor(connection, 1024, &POST_create_iterator, cs);
 245                         *ptr = cs;
 246                         return MHD_YES;
 247                 }
 248
 249                 if (*upload_data_size) {
 250                         MHD_post_process(cs->pp, upload_data, *upload_data_size);
 251                         *upload_data_size = 0;
 252                         return MHD_YES;
 253                 }
 254
 255                 if (cs->username[0] == 0 || cs->password[0] == 0)
 256                         return respond_JSON_Failure(connection);
 257
 258                 if (blerg_exists(cs->username))
 259                         return respond_JSON_Failure(connection);
 260
 261                 struct blerg *b = blerg_open(cs->username);
 262                 blerg_close(b);
 263                 auth_set_password(cs->username, cs->password);
 264
 265                 MHD_destroy_post_processor(cs->pp);
 266                 free(cs);
 267                 *ptr = NULL;
 268
 269                 return respond_JSON_Success(connection);
 270         } else {
 271                 return respond_404(connection);
 272         }
 273 }
 274
 275
 276 int main(int argc, char *argv[]) {
 277         struct MHD_Daemon *daemon;
 278         fd_set rs, ws, es;
 279         int max;
 280
 281         init_responses();
 282
 283         daemon = MHD_start_daemon(MHD_USE_DEBUG, 8080, NULL, NULL, &ahc_derp, NULL, MHD_OPTION_END);
 284         if (daemon == NULL) {
 285                 fprintf(stderr, "Could not start web server\n");
 286                 return 1;
 287         }
 288
 289         while (1) {
 290                 FD_ZERO(&rs); FD_ZERO(&ws); FD_ZERO(&es);
 291                 if (MHD_get_fdset(daemon, &rs, &ws, &es, &max) != MHD_YES) {
 292                         fprintf(stderr, "Fatal error getting fd sets\n");
 293                         break;
 294                 }
 295                 select(max + 1, &rs, &ws, &es, NULL);
 296                 MHD_run(daemon);
 297         }
 298         MHD_stop_daemon(daemon);
 299         return 0;
 300 }