Decode enrollment status JSON response

esp32_device/.vscode/settings.json

@@ -32,6 +32,7 @@
     "unsecure_api.h": "c",
     "esp_log.h": "c",
     "http_client.h": "c",
-    "string.h": "c"
+    "string.h": "c",
+    "cjson.h": "c"
   }
 }

esp32_device/main/main.c

@@ -99,7 +99,7 @@ void app_main(void)
     // Check current device enrollment status
     ESP_LOGI(TAG, "Check enrollment status");
     int status = secure_api_get_device_enrollment_status();
-    printf("Current enrollment status: %d\n", status);
+    ESP_LOGI(TAG, "Current enrollment status: %d\n", status);
 
     system_sleep(120);
 

esp32_device/main/secure_api.c

@@ -6,6 +6,7 @@
 #include "storage.h"
 #include "http_client.h"
 #include "constants.h"
+#include "cJSON.h"
 
 #include "esp_log.h"
 
@@ -46,6 +47,7 @@ enum DevEnrollmentStatus secure_api_get_device_enrollment_status()
     assert(storage_get_dev_name(uri + strlen(uri)) > 0);
 
     char *res = process_secure_request(uri);
+
     free(uri);
 
     if (res == NULL)
@@ -54,9 +56,37 @@ enum DevEnrollmentStatus secure_api_get_device_enrollment_status()
         return DevEnrollError;
     }
 
-    // TODO : parse reponse
-    printf("response = %s\n", res);
+    enum DevEnrollmentStatus s = DevEnrollError;
+    cJSON *root = cJSON_Parse(res);
+    if (root == NULL)
+    {
+        ESP_LOGE(TAG, "Failed to decode JSON response from server!");
+        goto fail;
+    }
+
+    cJSON *status = cJSON_GetObjectItem(root, "status");
+    if (status == NULL)
+    {
+        ESP_LOGE(TAG, "Status missing in response from server!");
+        goto fail;
+    }
+
+    if (!strcmp(status->valuestring, "Unknown"))
+        s = DevEnrollUnknown;
+    else if (!strcmp(status->valuestring, "Pending"))
+        s = DevEnrollPending;
+    else if (!strcmp(status->valuestring, "Validated"))
+        s = DevEnrollValidated;
+    else
+    {
+        ESP_LOGE(TAG, "Unknown enrollment status: %s", status->valuestring);
+        goto fail;
+    }
+
+fail:
+
+    cJSON_Delete(root);
     free(res);
 
-    return DevEnrollError;
+    return s;
 }

esp32_device/main/secure_api.h

@@ -15,13 +15,13 @@ extern "C"
     enum DevEnrollmentStatus
     {
         /** An error occurred while retrieving device status */
-        DevEnrollError,
+        DevEnrollError = 0,
         /** Device is unknown by the backend */
-        DevEnrollUnknown,
+        DevEnrollUnknown = 1,
         /** Device hasn't been validated yet */
-        DevEnrollPending,
+        DevEnrollPending = 2,
         /** Device has been validated by the backend */
-        DevEnrollValidated,
+        DevEnrollValidated = 3,
     };
 
     /**