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xmpp.chapril.org-ejabberd/src/ejabberd_commands.erl

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%%%----------------------------------------------------------------------
%%% File : ejabberd_commands.erl
%%% Author : Badlop <badlop@process-one.net>
%%% Purpose : Management of ejabberd commands
%%% Created : 20 May 2008 by Badlop <badlop@process-one.net>
%%%
%%%
%%% ejabberd, Copyright (C) 2002-2019 ProcessOne
%%%
%%% This program is free software; you can redistribute it and/or
%%% modify it under the terms of the GNU General Public License as
%%% published by the Free Software Foundation; either version 2 of the
%%% License, or (at your option) any later version.
%%%
%%% This program is distributed in the hope that it will be useful,
%%% but WITHOUT ANY WARRANTY; without even the implied warranty of
%%% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
%%% General Public License for more details.
%%%
%%% You should have received a copy of the GNU General Public License along
%%% with this program; if not, write to the Free Software Foundation, Inc.,
%%% 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
%%%
%%%----------------------------------------------------------------------
%%% @headerfile "ejabberd_commands.hrl"
%%% @doc Management of ejabberd commands.
%%%
%%% An ejabberd command is an abstract function identified by a name,
%%% with a defined number and type of calling arguments and type of
%%% result, that can be defined in any Erlang module and executed
%%% using any valid frontend.
%%%
%%%
%%% == Define a new ejabberd command ==
%%%
%%% ejabberd commands can be defined and registered in
%%% any Erlang module.
%%%
%%% Some commands are procedures; and their purpose is to perform an
%%% action in the server, so the command result is only some result
%%% code or result tuple. Other commands are inspectors, and their
%%% purpose is to gather some information about the server and return
%%% a detailed response: it can be integer, string, atom, tuple, list
%%% or a mix of those ones.
%%%
%%% The arguments and result of an ejabberd command are strictly
%%% defined. The number and format of the arguments provided when
%%% calling an ejabberd command must match the definition of that
%%% command. The format of the result provided by an ejabberd command
%%% must be exactly its definition. For example, if a command is said
%%% to return an integer, it must always return an integer (except in
%%% case of a crash).
%%%
%%% If you are developing an Erlang module that will run inside
%%% ejabberd and you want to provide a new ejabberd command to
%%% administer some task related to your module, you only need to:
%%% implement a function, define the command, and register it.
%%%
%%%
%%% === Define a new ejabberd command ===
%%%
%%% An ejabberd command is defined using the Erlang record
%%% 'ejabberd_commands'. This record has several elements that you
%%% must define. Note that 'tags', 'desc' and 'longdesc' are optional.
%%%
%%% For example let's define an ejabberd command 'pow' that gets the
%%% integers 'base' and 'exponent'. Its result will be an integer
%%% 'power':
%%%
%%% <pre>#ejabberd_commands{name = pow, tags = [test],
%%% desc = "Return the power of base for exponent",
%%% longdesc = "This is an example command. The formula is:\n"
%%% " power = base ^ exponent",
%%% module = ?MODULE, function = pow,
%%% args = [{base, integer}, {exponent, integer}],
%%% result = {power, integer}}</pre>
%%%
%%%
%%% === Implement the function associated to the command ===
%%%
%%% Now implement a function in your module that matches the arguments
%%% and result of the ejabberd command.
%%%
%%% For example the function calc_power gets two integers Base and
%%% Exponent. It calculates the power and rounds to an integer:
%%%
%%% <pre>calc_power(Base, Exponent) ->
%%% PowFloat = math:pow(Base, Exponent),
%%% round(PowFloat).</pre>
%%%
%%% Since this function will be called by ejabberd_commands, it must
%%% be exported.
%%% Add to your module:
%%% <pre>-export([calc_power/2]).</pre>
%%%
%%% Only some types of result formats are allowed.
%%% If the format is defined as 'rescode', then your function must return:
%%% ok | true | atom()
%%% where the atoms ok and true as considered positive answers,
%%% and any other response atom is considered negative.
%%%
%%% If the format is defined as 'restuple', then the command must return:
%%% {rescode(), string()}
%%%
%%% If the format is defined as '{list, something()}', then the command
%%% must return a list of something().
%%%
%%%
%%% === Register the command ===
%%%
%%% Define this function and put inside the #ejabberd_command you
%%% defined in the beginning:
%%%
%%% <pre>commands() ->
%%% [
%%%
%%% ].</pre>
%%%
%%% You need to include this header file in order to use the record:
%%%
%%% <pre>-include("ejabberd_commands.hrl").</pre>
%%%
%%% When your module is initialized or started, register your commands:
%%%
%%% <pre>ejabberd_commands:register_commands(commands()),</pre>
%%%
%%% And when your module is stopped, unregister your commands:
%%%
%%% <pre>ejabberd_commands:unregister_commands(commands()),</pre>
%%%
%%% That's all! Now when your module is started, the command will be
%%% registered and any frontend can access it. For example:
%%%
%%% <pre>$ ejabberdctl help pow
%%%
%%% Command Name: pow
%%%
%%% Arguments: base::integer
%%% exponent::integer
%%%
%%% Returns: power::integer
%%%
%%% Tags: test
%%%
%%% Description: Return the power of base for exponent
%%%
%%% This is an example command. The formula is:
%%% power = base ^ exponent
%%%
%%% $ ejabberdctl pow 3 4
%%% 81
%%% </pre>
%%%
%%%
%%% == Execute an ejabberd command ==
%%%
%%% ejabberd commands are mean to be executed using any valid
%%% frontend. An ejabberd commands is implemented in a regular Erlang
%%% function, so it is also possible to execute this function in any
%%% Erlang module, without dealing with the associated ejabberd
%%% commands.
%%%
%%%
%%% == Frontend to ejabberd commands ==
%%%
%%% Currently there are two frontends to ejabberd commands: the shell
%%% script {@link ejabberd_ctl. ejabberdctl}, and the XML-RPC server
%%% ejabberd_xmlrpc.
%%%
%%%
%%% === ejabberdctl as a frontend to ejabberd commands ===
%%%
%%% It is possible to use ejabberdctl to get documentation of any
%%% command. But ejabberdctl does not support all the argument types
%%% allowed in ejabberd commands, so there are some ejabberd commands
%%% that cannot be executed using ejabberdctl.
%%%
%%% Also note that the ejabberdctl shell administration script also
%%% manages ejabberdctl commands, which are unrelated to ejabberd
%%% commands and can only be executed using ejabberdctl.
%%%
%%%
%%% === ejabberd_xmlrpc as a frontend to ejabberd commands ===
%%%
%%% ejabberd_xmlrpc provides an XML-RPC server to execute ejabberd commands.
%%% ejabberd_xmlrpc is a contributed module published in ejabberd-modules SVN.
%%%
%%% Since ejabberd_xmlrpc does not provide any method to get documentation
%%% of the ejabberd commands, please use ejabberdctl to know which
%%% commands are available, and their usage.
%%%
%%% The number and format of the arguments provided when calling an
%%% ejabberd command must match the definition of that command. Please
%%% make sure the XML-RPC call provides the required arguments, with
%%% the specified format. The order of the arguments in an XML-RPC
%%% call is not important, because all the data is tagged and will be
%%% correctly prepared by ejabberd_xmlrpc before executing the ejabberd
%%% command.
%%% TODO: consider this feature:
%%% All commands are catched. If an error happens, return the restuple:
%%% {error, flattened error string}
%%% This means that ecomm call APIs (ejabberd_ctl, ejabberd_xmlrpc)
%%% need to allows this. And ejabberd_xmlrpc must be prepared to
%%% handle such an unexpected response.
-module(ejabberd_commands).
-author('badlop@process-one.net').
-behaviour(gen_server).
-define(DEFAULT_VERSION, 1000000).
-export([start_link/0,
list_commands/0,
list_commands/1,
get_command_format/1,
get_command_format/2,
get_command_format/3,
get_command_definition/1,
get_command_definition/2,
get_tags_commands/0,
get_tags_commands/1,
register_commands/1,
unregister_commands/1,
get_commands_spec/0,
get_commands_definition/0,
get_commands_definition/1,
execute_command2/3,
execute_command2/4]).
%% gen_server callbacks
-export([init/1, handle_call/3, handle_cast/2, handle_info/2,
terminate/2, code_change/3]).
-include("ejabberd_commands.hrl").
-include("logger.hrl").
-include_lib("stdlib/include/ms_transform.hrl").
-define(POLICY_ACCESS, '$policy').
-type auth() :: {binary(), binary(), binary() | {oauth, binary()}, boolean()} | map().
-record(state, {}).
get_commands_spec() ->
[
#ejabberd_commands{name = gen_html_doc_for_commands, tags = [documentation],
desc = "Generates html documentation for ejabberd_commands",
module = ejabberd_commands_doc, function = generate_html_output,
args = [{file, binary}, {regexp, binary}, {examples, binary}],
result = {res, rescode},
args_desc = ["Path to file where generated "
"documentation should be stored",
"Regexp matching names of commands or modules "
"that will be included inside generated document",
"Comma separated list of languages (chosen from java, perl, xmlrpc, json)"
"that will have example invocation include in markdown document"],
result_desc = "0 if command failed, 1 when succeeded",
args_example = ["/home/me/docs/api.html", "mod_admin", "java,json"],
result_example = ok},
#ejabberd_commands{name = gen_markdown_doc_for_commands, tags = [documentation],
desc = "Generates markdown documentation for ejabberd_commands",
module = ejabberd_commands_doc, function = generate_md_output,
args = [{file, binary}, {regexp, binary}, {examples, binary}],
result = {res, rescode},
args_desc = ["Path to file where generated "
"documentation should be stored",
"Regexp matching names of commands or modules "
"that will be included inside generated document",
"Comma separated list of languages (chosen from java, perl, xmlrpc, json)"
"that will have example invocation include in markdown document"],
result_desc = "0 if command failed, 1 when succeeded",
args_example = ["/home/me/docs/api.html", "mod_admin", "java,json"],
result_example = ok}].
start_link() ->
gen_server:start_link({local, ?MODULE}, ?MODULE, [], []).
init([]) ->
try mnesia:transform_table(ejabberd_commands, ignore,
record_info(fields, ejabberd_commands))
catch exit:{aborted, {no_exists, _}} -> ok
end,
ejabberd_mnesia:create(?MODULE, ejabberd_commands,
[{ram_copies, [node()]},
{local_content, true},
{attributes, record_info(fields, ejabberd_commands)},
{type, bag}]),
register_commands(get_commands_spec()),
{ok, #state{}}.
handle_call(_Request, _From, State) ->
Reply = ok,
{reply, Reply, State}.
handle_cast(_Msg, State) ->
{noreply, State}.
handle_info(_Info, State) ->
{noreply, State}.
terminate(_Reason, _State) ->
ok.
code_change(_OldVsn, State, _Extra) ->
{ok, State}.
-spec register_commands([ejabberd_commands()]) -> ok.
%% @doc Register ejabberd commands.
%% If a command is already registered, a warning is printed and the
%% old command is preserved.
%% A registered command is not directly available to be called through
%% ejabberd ReST API. It need to be exposed to be available through API.
register_commands(Commands) ->
lists:foreach(
fun(Command) ->
%% XXX check if command exists
mnesia:dirty_write(Command)
%% ?DEBUG("This command is already defined:~n~p", [Command])
end,
Commands),
ejabberd_access_permissions:invalidate(),
ok.
-spec unregister_commands([ejabberd_commands()]) -> ok.
%% @doc Unregister ejabberd commands.
unregister_commands(Commands) ->
lists:foreach(
fun(Command) ->
mnesia:dirty_delete_object(Command)
end,
Commands),
ejabberd_access_permissions:invalidate().
-spec list_commands() -> [{atom(), [aterm()], string()}].
%% @doc Get a list of all the available commands, arguments and description.
list_commands() ->
list_commands(?DEFAULT_VERSION).
-spec list_commands(integer()) -> [{atom(), [aterm()], string()}].
%% @doc Get a list of all the available commands, arguments and
%% description in a given API verion.
list_commands(Version) ->
Commands = get_commands_definition(Version),
[{Name, Args, Desc} || #ejabberd_commands{name = Name,
args = Args,
desc = Desc} <- Commands].
-spec get_command_format(atom()) -> {[aterm()], [{atom(),atom()}], rterm()}.
%% @doc Get the format of arguments and result of a command.
get_command_format(Name) ->
get_command_format(Name, noauth, ?DEFAULT_VERSION).
get_command_format(Name, Version) when is_integer(Version) ->
get_command_format(Name, noauth, Version);
get_command_format(Name, Auth) ->
get_command_format(Name, Auth, ?DEFAULT_VERSION).
-spec get_command_format(atom(), noauth | admin | auth(), integer()) -> {[aterm()], [{atom(),atom()}], rterm()}.
get_command_format(Name, Auth, Version) ->
Admin = is_admin(Name, Auth, #{}),
#ejabberd_commands{args = Args,
result = Result,
args_rename = Rename,
policy = Policy} =
get_command_definition(Name, Version),
case Policy of
user when Admin;
Auth == noauth ->
{[{user, binary}, {host, binary} | Args], Rename, Result};
_ ->
{Args, Rename, Result}
end.
-spec get_command_definition(atom()) -> ejabberd_commands().
%% @doc Get the definition record of a command.
get_command_definition(Name) ->
get_command_definition(Name, ?DEFAULT_VERSION).
-spec get_command_definition(atom(), integer()) -> ejabberd_commands().
%% @doc Get the definition record of a command in a given API version.
get_command_definition(Name, Version) ->
case lists:reverse(
lists:sort(
mnesia:dirty_select(
ejabberd_commands,
ets:fun2ms(
fun(#ejabberd_commands{name = N, version = V} = C)
when N == Name, V =< Version ->
{V, C}
end)))) of
[{_, Command} | _ ] -> Command;
_E -> throw({error, unknown_command})
end.
get_commands_definition() ->
get_commands_definition(?DEFAULT_VERSION).
-spec get_commands_definition(integer()) -> [ejabberd_commands()].
% @doc Returns all commands for a given API version
get_commands_definition(Version) ->
L = lists:reverse(
lists:sort(
mnesia:dirty_select(
ejabberd_commands,
ets:fun2ms(
fun(#ejabberd_commands{name = Name, version = V} = C)
when V =< Version ->
{Name, V, C}
end)))),
F = fun({_Name, _V, Command}, []) ->
[Command];
({Name, _V, _Command}, [#ejabberd_commands{name=Name}|_T] = Acc) ->
Acc;
({_Name, _V, Command}, Acc) -> [Command | Acc]
end,
lists:foldl(F, [], L).
execute_command2(Name, Arguments, CallerInfo) ->
execute_command2(Name, Arguments, CallerInfo, ?DEFAULT_VERSION).
execute_command2(Name, Arguments, CallerInfo, Version) ->
Command = get_command_definition(Name, Version),
case ejabberd_access_permissions:can_access(Name, CallerInfo) of
allow ->
do_execute_command(Command, Arguments);
_ ->
throw({error, access_rules_unauthorized})
end.
do_execute_command(Command, Arguments) ->
Module = Command#ejabberd_commands.module,
Function = Command#ejabberd_commands.function,
?DEBUG("Executing command ~p:~p with Args=~p", [Module, Function, Arguments]),
ejabberd_hooks:run(api_call, [Module, Function, Arguments]),
apply(Module, Function, Arguments).
-spec get_tags_commands() -> [{string(), [string()]}].
%% @spec () -> [{Tag::string(), [CommandName::string()]}]
%% @doc Get all the tags and associated commands.
get_tags_commands() ->
get_tags_commands(?DEFAULT_VERSION).
-spec get_tags_commands(integer()) -> [{string(), [string()]}].
%% @spec (integer) -> [{Tag::string(), [CommandName::string()]}]
%% @doc Get all the tags and associated commands in a given API version
get_tags_commands(Version) ->
CommandTags = [{Name, Tags} ||
#ejabberd_commands{name = Name, tags = Tags}
<- get_commands_definition(Version)],
Dict = lists:foldl(
fun({CommandNameAtom, CTags}, D) ->
CommandName = atom_to_list(CommandNameAtom),
case CTags of
[] ->
orddict:append("untagged", CommandName, D);
_ ->
lists:foldl(
fun(TagAtom, DD) ->
Tag = atom_to_list(TagAtom),
orddict:append(Tag, CommandName, DD)
end,
D,
CTags)
end
end,
orddict:new(),
CommandTags),
orddict:to_list(Dict).
%% -----------------------------
%% Access verification
%% -----------------------------
-spec is_admin(atom(), admin | noauth | auth(), map()) -> boolean().
is_admin(_Name, admin, _Extra) ->
true;
is_admin(_Name, {_User, _Server, _, false}, _Extra) ->
false;
is_admin(_Name, Map, _extra) when is_map(Map) ->
true;
is_admin(_Name, _Auth, _Extra) ->
false.
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