extract_ip.lua

extract_ip.lua

-- Oleksii.Kirdin@ezlo.com, 2023-06-25
-- Anonymous Plugin (aka Lua script) for Ezlogic.
-- Result: saves extracted string value to the target variable.

local logging = require "logging"
local json = assert(require "json", "Could not load json library")
local scenes = require "scenes"

local variables = {
    source = "myIP",
    target = "WANIP"
}

local path_to_extract = {"ip"}

local function extract_by_path(data, path)
    local value = data
    for _, key in ipairs(path) do
        logging.debug("key: " .. tostring(key))
        value = value[key]
        logging.trace(value)
    end
    return value
end

local function extract_and_save(variable_from, variable_to, path)
    logging.debug("HTTP Response variable: " .. variables.source)

    local http_response_variable = scenes.get_expression_value(variable_from)

    if http_response_variable.value ~= nil then
        logging.debug("Source variable has value: " .. tostring(http_response_variable.value))

        local data = http_response_variable.value

        local res = json.decode(data)
        logging.debug("After json.decode")
        logging.trace(res)

        local found_str = extract_by_path(res, path)
        logging.debug(found_str)

        -- fetch ONLY in full mode, not in compact:
        local success, saved_value = pcall(scenes.get_expression_value, variable_to, {compact = false})
        logging.trace("pcall.success: " .. tostring(success))
        logging.trace("pcall.saved_value: " .. json.encode(saved_value))

        local target_value = {
            value = found_str,
            value_type = saved_value.value_type or "string",
            metadata = saved_value.metadata or {}
        }

        logging.debug("target_value: " .. json.encode(target_value))
        logging.debug("Save to target variable: " .. variable_to)
        scenes.set_variable(variable_to, target_value)
        return true
    else
        logging.error("Source variable has no value")
        if http_response_variable.error ~= nil then
            logging.error("Variable.error: " .. tostring(http_response_variable.error))
        end
        return false
    end
end

return extract_and_save(variables.source, variables.target, path_to_extract)