errors.lua

local class = require "middleclass"
local plugin = require "bunkerweb.plugin"

local ngx = ngx
local subsystem = ngx.config.subsystem
local tostring = tostring

local template
local render = nil
if subsystem == "http" then
	template = require "resty.template"
	render = template.render
end

local errors = class("errors", plugin)

function errors:initialize(ctx)
	-- Call parent initialize
	plugin.initialize(self, "errors", ctx)
	-- Default error texts
	self.default_errors = {
		["301"] = {
			title = "Moved Permanently",
			text = "The requested page has moved to a new url.",
		},
		["302"] = {
			title = "Found",
			text = "The requested page has moved temporarily to a new url.",
		},
		["400"] = {
			title = "Bad Request",
			text = "The server did not understand the request.",
		},
		["401"] = {
			title = "Not Authorized",
			text = "Valid authentication credentials needed for the target resource.",
		},
		["403"] = {
			title = "Forbidden",
			text = "Access is forbidden to the requested page.",
		},
		["404"] = {
			title = "Not Found",
			text = "The server cannot find the requested page.",
		},
		["405"] = {
			title = "Method Not Allowed",
			text = "The method specified in the request is not allowed.",
		},
		["413"] = {
			title = "Request Entity Too Large",
			text = "The server will not accept the request, because the request entity is too large.",
		},
		["429"] = {
			title = "Too Many Requests",
			text = "Too many requests sent in a given amount of time, try again later.",
		},
		["500"] = {
			title = "Internal Server Error",
			text = "The request was not completed. The server met an unexpected condition.",
		},
		["501"] = {
			title = "Not Implemented",
			text = "The request was not completed. The server did not support the functionality required.",
		},
		["502"] = {
			title = "Bad Gateway",
			text = "The request was not completed. The server received an invalid response from the upstream server.",
		},
		["503"] = {
			title = "Service Unavailable",
			text = "The request was not completed. The server is temporarily overloading or down.",
		},
		["504"] = {
			title = "Gateway Timeout",
			text = "The gateway has timed out.",
		},
	}
end

function errors:log()
	self:set_metric("counters", tostring(ngx.status), 1)
	return self:ret(true, "success")
end

function errors:render_template(code)
	-- Render template
	render("error.html", {
		title = code .. " - " .. self.default_errors[code].title,
		error_title = self.default_errors[code].title,
		error_code = code,
		error_text = self.default_errors[code].text,
	})
end

return errors