add: tag post endpoint

src/endpoints/api_v1_tags.c

@@ -33,3 +33,57 @@ api_v1_tags_GET(struct mg_connection *nc, struct http_message *hm, endpoint_args
     cJSON_Delete(json);
     free(all_tags);
 }
+
+void
+api_v1_tags_POST(struct mg_connection *nc, struct http_message *hm, endpoint_args_t *args, endpoint_response_t *response)
+{
+    (void)args;
+    (void)nc;
+
+    cJSON *json = cJSON_ParseWithLength(hm->body.p, hm->body.len);
+
+    if(json == NULL)
+    {
+        static const char content[] = "no valid json was supplied";
+        endpoint_response_text(response, 400, content, STRLEN(content));
+        return;
+    }
+
+    cJSON *json_tag = cJSON_GetObjectItemCaseSensitive(json, "tag");
+    if(!cJSON_IsString(json_tag) || (json_tag->valuestring == NULL))
+    {
+        LOGGER_DEBUG("no tag provided\n");
+        cJSON_Delete(json);
+
+        static const char content[] = "no tag provided";
+        endpoint_response_text(response, 400, content, STRLEN(content));
+        return;
+    }
+
+    if(tag_get_id(json_tag->valuestring))
+    {
+        LOGGER_DEBUG("tag existed already\n");
+        cJSON_Delete(json);
+
+        static const char content[] = "tag existed already";
+        endpoint_response_text(response, 400, content, STRLEN(content));
+        return;
+    }
+
+    if(tag_save(0, json_tag->valuestring))
+    {
+        LOGGER_DEBUG("tag could not be saved\n");
+
+        static const char content[] = "tag could not be saved";
+        endpoint_response_text(response, 500, content, STRLEN(content));
+    }
+    else
+    {
+        LOGGER_DEBUG("new tag saved\n");
+
+        endpoint_response_text(response, 201, json_tag->valuestring, 0);
+    }
+
+    cJSON_Delete(json);
+    return;
+}