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erldns

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Erlang Authoritative DNS Server

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erldns src admin erldns_admin_root_handler.erl
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src/admin/erldns_admin_root_handler.erl 

-module(erldns_admin_root_handler).

-moduledoc false.

-include_lib("kernel/include/logger.hrl").



-export([init/2]).

-export([

    content_types_provided/2,

    is_authorized/2,

    allowed_methods/2,

    delete_resource/2

]).

-export([to_html/2, to_json/2, to_text/2]).



-behaviour(cowboy_rest).



-doc false.

-spec init(cowboy_req:req(), erldns_admin:handler_state()) ->

    {cowboy_rest, cowboy_req:req(), erldns_admin:handler_state()}.

init(Req, State) ->

    {cowboy_rest, Req, State}.



-doc "Only GET and DELETE methods are allowed".

-spec allowed_methods(cowboy_req:req(), erldns_admin:handler_state()) ->

    {[binary()], cowboy_req:req(), erldns_admin:handler_state()}.

allowed_methods(Req, State) ->

    {[<<"GET">>, <<"DELETE">>], Req, State}.



-doc false.

-spec content_types_provided(cowboy_req:req(), erldns_admin:handler_state()) ->

    {[{{binary(), binary(), '*'}, atom()}], cowboy_req:req(), erldns_admin:handler_state()}.

content_types_provided(Req, State) ->

    {

        [

            {{<<"text">>, <<"html">>, '*'}, to_html},

            {{<<"text">>, <<"plain">>, '*'}, to_text},

            {{<<"application">>, <<"json">>, '*'}, to_json}

        ],

        Req,

        State

    }.



-doc false.

-spec is_authorized(cowboy_req:req(), erldns_admin:handler_state()) ->

    {true | {false, iodata()}, cowboy_req:req(), erldns_admin:handler_state()}

    | {stop, cowboy_req:req(), erldns_admin:handler_state()}.

is_authorized(Req, State) ->

    erldns_admin:is_authorized(Req, State).



-doc false.

-spec to_html(cowboy_req:req(), erldns_admin:handler_state()) ->

    {cowboy_req:resp_body(), cowboy_req:req(), erldns_admin:handler_state()}.

to_html(Req, State) ->

    {<<"erldns admin">>, Req, State}.



-doc false.

-spec to_text(cowboy_req:req(), erldns_admin:handler_state()) ->

    {cowboy_req:resp_body(), cowboy_req:req(), erldns_admin:handler_state()}.

to_text(Req, State) ->

    {<<"erldns admin">>, Req, State}.



-doc """

Delete query queues

""".

-spec delete_resource(cowboy_req:req(), erldns_admin:handler_state()) ->

    {boolean(), cowboy_req:req(), erldns_admin:handler_state()}.

delete_resource(Req, State) ->

    ?LOG_WARNING(#{what => resetting_listener_queues}),

    {erldns_listeners:reset_queues(), Req, State}.



-doc "Return information about the zones in the cache.".

-spec to_json(cowboy_req:req(), erldns_admin:handler_state()) ->

    {cowboy_req:resp_body(), cowboy_req:req(), erldns_admin:handler_state()}.

to_json(Req, State) ->

    ZoneNamesAndVersionsForJson = lists:map(

        fun({Name, Version}) ->

            #{<<"name">> => Name, <<"version">> => Version}

        end,

        erldns_zone_cache:zone_names_and_versions()

    ),

    Body = json:encode(#{

        <<"erldns">> => #{

            <<"zones">> => #{

                <<"count">> => length(ZoneNamesAndVersionsForJson),

                <<"versions">> => ZoneNamesAndVersionsForJson

            }

        }

    }),

    {Body, Req, State}.