aproxy/main.lua

local CONFIG_PATH = ".;/etc/aproxy"

-- function loadConfig()
--     -- TODO load config_path
--     return require("./config.lua")
-- end
-- 
-- local config = loadConfig()

function log(msg)
    ngx.log(ngx.STDERR, tostring(msg))
end

local WANTED_SCRIPTS = {
    ['scripts.webfinger_allowlist'] = {accounts = {"example@example.com"}}
}

local compiled_chain = {}

for module_name, module_config in pairs(WANTED_SCRIPTS) do
    local module = require(module_name)
    local module_state = module.init(module_config)
    -- TODO is it possible to make module_config readonly?
    table.insert(compiled_chain, {module, module_config, module_state})
end

local function onRequest()
    local request_uri = ngx.var.uri

    -- find out which modules to call based on their regexes
    local callbacks_to_call = {}
    for _, filter in ipairs(compiled_chain) do
        local module, module_config, state = unpack(filter)

        for callback_regex, callback_function in pairs(module.callbacks) do
            local match, error = ngx.re.match(request_uri, callback_regex)
            if match then
                table.insert(callbacks_to_call, {callback_function, module_config, state})
            end
        end
    end

    log('AWOOOOGA')

    for _,tuple in ipairs(callbacks_to_call) do
        local callback_function, config, state = unpack(tuple)
        local status_code, body = callback_function(config, state)
        if status_code ~= nil then
            ngx.status = status_code
            ngx.say(body or "request denied")
            ngx.exit(status_code)
        end
    end
end

return onRequest