%% This Source Code Form is subject to the terms of the Mozilla Public
%% License, v. 2.0. If a copy of the MPL was not distributed with this
%% file, You can obtain one at https://mozilla.org/MPL/2.0/.
%%
%% Copyright (c) 2007-2020 VMware, Inc. or its affiliates.  All rights reserved.
%%

-module(rabbit_mgmt_wm_connection).

-export([init/2, resource_exists/2, to_json/2, content_types_provided/2,
         is_authorized/2, allowed_methods/2, delete_resource/2, conn/1]).
-export([variances/2]).

-include_lib("rabbitmq_management_agent/include/rabbit_mgmt_records.hrl").
-include_lib("rabbit_common/include/rabbit.hrl").

%%--------------------------------------------------------------------

init(Req, _State) ->
    {cowboy_rest, rabbit_mgmt_headers:set_common_permission_headers(Req, ?MODULE), #context{}}.

variances(Req, Context) ->
    {[<<"accept-encoding">>, <<"origin">>], Req, Context}.

content_types_provided(ReqData, Context) ->
   {rabbit_mgmt_util:responder_map(to_json), ReqData, Context}.

allowed_methods(ReqData, Context) ->
    {[<<"HEAD">>, <<"GET">>, <<"DELETE">>, <<"OPTIONS">>], ReqData, Context}.

resource_exists(ReqData, Context) ->
    case conn(ReqData) of
        not_found -> {false, ReqData, Context};
        _Conn     -> {true, ReqData, Context}
    end.

to_json(ReqData, Context) ->
    case rabbit_mgmt_util:disable_stats(ReqData) of
        false ->
            rabbit_mgmt_util:reply(
              maps:from_list(rabbit_mgmt_format:strip_pids(conn_stats(ReqData))), ReqData, Context);
        true ->
            rabbit_mgmt_util:reply([{name, rabbit_mgmt_util:id(connection, ReqData)}],
                                   ReqData, Context)
    end.

delete_resource(ReqData, Context) ->
    case conn(ReqData) of
        not_found -> ok;
        Conn      ->
            case proplists:get_value(pid, Conn) of
                undefined -> ok;
                Pid when is_pid(Pid) ->
                    force_close_connection(ReqData, Conn, Pid)
            end
    end,
    {true, ReqData, Context}.

is_authorized(ReqData, Context) ->
    try
        rabbit_mgmt_util:is_authorized_user(ReqData, Context, conn(ReqData))
    catch
        {error, invalid_range_parameters, Reason} ->
            rabbit_mgmt_util:bad_request(iolist_to_binary(Reason), ReqData, Context)
    end.

%%--------------------------------------------------------------------

conn(ReqData) ->
    case rabbit_mgmt_util:disable_stats(ReqData) of
        false ->
            conn_stats(ReqData);
        true ->
            case rabbit_connection_tracking:lookup(rabbit_mgmt_util:id(connection, ReqData)) of
                #tracked_connection{name = Name, pid = Pid, username = Username, type = Type} ->
                    [{name, Name}, {pid, Pid}, {user, Username}, {type, Type}];
                not_found ->
                    not_found
            end
    end.

conn_stats(ReqData) ->
    rabbit_mgmt_db:get_connection(rabbit_mgmt_util:id(connection, ReqData),
                                  rabbit_mgmt_util:range_ceil(ReqData)).

force_close_connection(ReqData, Conn, Pid) ->
    Reason = case cowboy_req:header(<<"x-reason">>, ReqData) of
                 undefined -> "Closed via management plugin";
                 V         -> binary_to_list(V)
             end,
            case proplists:get_value(type, Conn) of
                direct  -> amqp_direct_connection:server_close(Pid, 320, Reason);
                network -> rabbit_networking:close_connection(Pid, Reason)
            end,
    ok.
