ngx_stub.lua

--- Stub _G.ngx for unit testing.
-- Creates a stub for `ngx` for use by Kong's modules such as the DAO. It allows to use them
-- outside of the nginx context such as when using the CLI, or unit testing.
--
-- Monkeypatches the global `ngx` table.

local reg = require "rex_pcre"

_G.ngx = {
  req = {},
  ctx = {},
  header = {},
  exit = function() end,
  say = function() end,
  log = function() end,
  socket = { tcp = {} },
  now = function() return os.time() end,
  time = function() return os.time() end,
  timer = {
    at = function() end
  },
  re = {
    match = reg.match,
    gsub = function(str, pattern, sub)
      local res_str, _, sub_made = reg.gsub(str, pattern, sub)
      return res_str, sub_made
    end
  },
  encode_base64 = function(str)
    return string.format("base64_%s", str)
  end,
  -- Builds a querystring from a table, separated by `&`
  -- @param `tab`          The key/value parameters
  -- @param `key`          The parent key if the value is multi-dimensional (optional)
  -- @return `querystring` A string representing the built querystring
  encode_args = function(tab, key)
    local query = {}
    local keys = {}

    for k in pairs(tab) do
      keys[#keys+1] = k
    end

    table.sort(keys)

    for _, name in ipairs(keys) do
      local value = tab[name]
      if key then
        name = string.format("%s[%s]", tostring(key), tostring(name))
      end
      if type(value) == "table" then
        query[#query+1] = ngx.encode_args(value, name)
      else
        value = tostring(value)
        if value ~= "" then
          query[#query+1] = string.format("%s=%s", name, value)
        else
          query[#query+1] = name
        end
      end
    end

    return table.concat(query, "&")
  end
}