nci-list-courses.c

   1 /*
   2  * Copyright (c) 2016-2018 S. Gilles <sgilles@math.umd.edu>
   3  *
   4  * Permission to use, copy, modify, and/or distribute this software
   5  * for any purpose with or without fee is hereby granted, provided
   6  * that the above copyright notice and this permission notice appear
   7  * in all copies.
   8  *
   9  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
  10  * WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
  11  * WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE
  12  * AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR
  13  * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
  14  * OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
  15  * NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
  16  * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  17  */
  18 #include <errno.h>
  19 #include <locale.h>
  20 #include <stdint.h>
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23
  24 #include <curl/curl.h>
  25 #include <yajl_parse.h>
  26
  27 #include "macros.h"
  28 #include "util.h"
  29
  30 static int list_courses(const char *url_base, const char *auth_token)
  31 {
  32         size_t j = 0;
  33         int ret = EINVAL;
  34         size_t len = 0;
  35         char *built_uri = 0;
  36         const char *fn_courses[] = { "id", "name", 0 };
  37         map courses = { 0 };
  38         char **courses_ids = 0;
  39         char **c = 0;
  40         size_t courses_num = 0;
  41
  42         len = snprintf(0, 0, "%s/api/v1/courses?per_page=9999", url_base);
  43
  44         if (len + 1 < len) {
  45                 ret = errno = EOVERFLOW;
  46                 perror(L(""));
  47                 goto cleanup;
  48         }
  49
  50         if (!(built_uri = malloc(len + 1))) {
  51                 ret = errno;
  52                 perror(L("malloc"));
  53                 goto cleanup;
  54         }
  55
  56         sprintf(built_uri, "%s/api/v1/courses?per_page=9999", url_base);
  57
  58         if ((ret = key_value_extract(built_uri, auth_token, fn_courses, 0,
  59                                      &courses))) {
  60                 goto cleanup;
  61         }
  62
  63         map_get_keys(&courses, &courses_ids, &courses_num);
  64
  65         for (j = 0; j < courses_num; ++j) {
  66                 c = map_get(&courses, courses_ids[j]);
  67
  68                 if (c[0]) {
  69                         printf("%s %s\n", courses_ids[j], c[0]);
  70                 }
  71         }
  72
  73 cleanup:
  74         free(courses_ids);
  75         map_clean(&courses);
  76         free(built_uri);
  77
  78         return ret;
  79 }
  80
  81 int main(void)
  82 {
  83         int ret = EINVAL;
  84         char *url_base = 0;
  85         char *auth_token = 0;
  86
  87         setlocale(LC_ALL, "");
  88         curl_global_init(CURL_GLOBAL_DEFAULT);
  89
  90         if (!(url_base = get_url_base())) {
  91                 ret = ENOENT;
  92
  93                 /* Error should have already been printed */
  94                 goto cleanup;
  95         }
  96
  97         if (!(auth_token = get_auth_token())) {
  98                 ret = ENOENT;
  99
 100                 /* Error should have already been printed */
 101                 goto cleanup;
 102         }
 103
 104         if ((ret = list_courses(url_base, auth_token))) {
 105                 goto cleanup;
 106         }
 107
 108         ret = 0;
 109 cleanup:
 110         free(url_base);
 111         free(auth_token);
 112         curl_global_cleanup();
 113
 114         return ret;
 115 }