rest: add GET /efi

Add GET /efi request to obtain information about the client's
boot entries.

Field inside the /refresh payload
'efi': {
  'entries': [
    {
      "order": 0,
      "name": "Boot0000",
      "active": false,
      "description": "grub"
    },
    {
      "order": 1,
      "name": "Boot0001",
      "active": true,
      "description": "UEFI: PXE IP4 Realtek PCIe GBE Family Controller"
    }
  ]
}

If the client is not a EFI system it won't add the 'efi' field.
If an entry is not in the boot order it won't have the 'order' field.

GET /efi resquest payload structure:
{
    'clients': ['10.141.10.21', '10.141.10.22']
}

GET /efi response's structure:
{
  'clients': [
    {
      'ip': '10.141.10.21',
      'entries': [
        {
          "order": 0,
          "name": "Boot0000",
          "active": false,
          "description": "grub"
        },
        {
          "order": 1,
          "name": "Boot0001",
          "active": true,
          "description": "UEFI: PXE IP4 Realtek PCIe GBE Family Controller"
        }
      ]
    },
    {
      'ip': '10.141.10.22',
      'entries': []
    }
  ]
}

The client with ip 10.141.10.22 is a BIOS system.

If an entry does not appear in the boot order it won't have the
'order' field.

1 files changed, 97 insertions, 0 deletions

diff --git a/src/json.c b/src/json.c
index 11e66eb..638b1cb 100644
--- a/src/json.c
+++ b/src/json.c
@@ -303,3 +303,100 @@ int og_json_parse_cache(json_t *element, struct list_head *cache_list)
 
 	return err;
 }
+
+void og_boot_entry_free(struct list_head *boot_entry_list)
+{
+	struct og_boot_entry *boot_entry, *tmp;
+
+	list_for_each_entry_safe(boot_entry, tmp, boot_entry_list, list) {
+		list_del(&boot_entry->list);
+		free(boot_entry);
+	}
+}
+
+int og_json_parse_boot_entries(json_t *json_entries, struct list_head *boot_entry_list)
+{
+	uint64_t required_flags = OG_PARAM_EFI_NAME | OG_PARAM_EFI_DESCRIPTION | OG_PARAM_EFI_ACTIVE;
+	struct og_boot_entry *boot_entry;
+	json_t *json_elem, *value;
+	uint64_t flags = 0UL;
+	unsigned long i;
+	const char *key;
+	int err = 0;
+
+	if (json_typeof(json_entries) != JSON_ARRAY)
+		return -1;
+
+	for (i = 0; i < json_array_size(json_entries); i++) {
+		boot_entry = calloc(1, sizeof(struct og_boot_entry));
+		boot_entry->order = UINT64_MAX;
+		flags = 0UL;
+
+		if (!boot_entry)
+			return -1;
+
+		json_elem = json_array_get(json_entries, i);
+
+		if (json_typeof(json_elem) != JSON_OBJECT) {
+			free(boot_entry);
+			return -1;
+		}
+
+		json_object_foreach(json_elem, key, value) {
+			if (!strcmp(key, "name")) {
+				err = og_json_parse_string(value, &boot_entry->name);
+				flags |= OG_PARAM_EFI_NAME;
+			} else if (!strcmp(key, "active")) {
+				err = og_json_parse_bool(value, &boot_entry->active);
+				flags |= OG_PARAM_EFI_ACTIVE;
+			} else if (!strcmp(key, "description")) {
+				err = og_json_parse_string(value, &boot_entry->description);
+				flags |= OG_PARAM_EFI_DESCRIPTION;
+			} else if (!strcmp(key, "order")) {
+				err = og_json_parse_uint64(value, &boot_entry->order);
+			} else
+				err = -1;
+
+			if (err < 0) {
+				free(boot_entry);
+				return err;
+			}
+		}
+
+		if ((flags & required_flags) != required_flags) {
+			free(boot_entry);
+			return -1;
+		}
+
+		list_add_tail(&boot_entry->list, boot_entry_list);
+	}
+	return err;
+}
+
+int og_json_parse_efi(json_t *element, struct list_head *boot_entry_list)
+{
+	uint64_t required_flags = OG_PARAM_EFI_ENTRIES;
+	uint64_t flags = 0UL;
+	const char *key;
+	json_t *value;
+	int err = 0;
+
+	if (json_typeof(element) != JSON_OBJECT)
+		return -1;
+
+	json_object_foreach(element, key, value) {
+		if (!strcmp(key, "entries")) {
+			err = og_json_parse_boot_entries(value, boot_entry_list);
+			flags |= OG_PARAM_EFI_ENTRIES;
+		} else
+			err = -1;
+
+		if (err < 0)
+			return err;
+	}
+
+	if ((flags & required_flags) != required_flags)
+		return -1;
+
+	return err;
+}