nci-list-courses.c

   1 /*
   2  * Copyright (c) 2016-2019 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
  31 list_courses(const char *url_base, const char *auth_token)
  32 {
  33         size_t j = 0;
  34         int ret = EINVAL;
  35         size_t len = 0;
  36         char *built_uri = 0;
  37         const char *fn_courses[] = { "id", "name", 0 };
  38         map courses = { 0 };
  39         char **courses_ids = 0;
  40         char **c = 0;
  41         size_t courses_num = 0;
  42
  43         len = snprintf(0, 0, "%s/api/v1/courses?per_page=9999", url_base);
  44
  45         if (len + 1 < len) {
  46                 ret = errno = EOVERFLOW;
  47                 perror(L(""));
  48                 goto cleanup;
  49         }
  50
  51         if (!(built_uri = malloc(len + 1))) {
  52                 ret = errno;
  53                 perror(L("malloc"));
  54                 goto cleanup;
  55         }
  56
  57         sprintf(built_uri, "%s/api/v1/courses?per_page=9999", url_base);
  58
  59         if ((ret = key_value_extract(built_uri, auth_token, fn_courses, 0,
  60                                      &courses))) {
  61                 goto cleanup;
  62         }
  63
  64         map_get_keys(&courses, &courses_ids, &courses_num);
  65
  66         for (j = 0; j < courses_num; ++j) {
  67                 c = map_get(&courses, courses_ids[j]);
  68
  69                 if (c[0]) {
  70                         printf("%s %s\n", courses_ids[j], c[0]);
  71                 }
  72         }
  73
  74 cleanup:
  75         free(courses_ids);
  76         map_clean(&courses);
  77         free(built_uri);
  78
  79         return ret;
  80 }
  81
  82 int
  83 main(void)
  84 {
  85         int ret = EINVAL;
  86         char *url_base = 0;
  87         char *auth_token = 0;
  88
  89         setlocale(LC_ALL, "");
  90         curl_global_init(CURL_GLOBAL_DEFAULT);
  91
  92         if (!(url_base = get_url_base())) {
  93                 ret = ENOENT;
  94
  95                 /* Error should have already been printed */
  96                 goto cleanup;
  97         }
  98
  99         if (!(auth_token = get_auth_token())) {
 100                 ret = ENOENT;
 101
 102                 /* Error should have already been printed */
 103                 goto cleanup;
 104         }
 105
 106         if ((ret = list_courses(url_base, auth_token))) {
 107                 goto cleanup;
 108         }
 109
 110         ret = 0;
 111 cleanup:
 112         free(url_base);
 113         free(auth_token);
 114         curl_global_cleanup();
 115
 116         return ret;
 117 }