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mirror of https://github.com/processone/ejabberd.git synced 2024-12-24 17:29:28 +01:00
xmpp.chapril.org-ejabberd/src/misc.erl
2017-04-16 20:05:46 +03:00

251 lines
7.8 KiB
Erlang

%%%-------------------------------------------------------------------
%%% @author Evgeny Khramtsov <ekhramtsov@process-one.net>
%%% @doc
%%% This is the place for some unsorted auxiliary functions
%%% Some functions from jlib.erl are moved here
%%% Mild rubbish heap is accepted ;)
%%% @end
%%% Created : 30 Mar 2017 by Evgeny Khramtsov <ekhramtsov@process-one.net>
%%%
%%%
%%% ejabberd, Copyright (C) 2002-2017 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.
%%%
%%%-------------------------------------------------------------------
-module(misc).
%% API
-export([tolower/1, term_to_base64/1, base64_to_term/1,
decode_base64/1, encode_base64/1, ip_to_list/1,
hex_to_bin/1, hex_to_base64/1, expand_keyword/3,
atom_to_binary/1, binary_to_atom/1, tuple_to_binary/1,
l2i/1, i2l/1, i2l/2, expr_to_term/1, term_to_expr/1,
encode_pid/1, decode_pid/2, compile_exprs/2]).
%%%===================================================================
%%% API
%%%===================================================================
-spec tolower(binary()) -> binary().
tolower(B) ->
iolist_to_binary(tolower_s(binary_to_list(B))).
tolower_s([C | Cs]) ->
if C >= $A, C =< $Z -> [C + 32 | tolower_s(Cs)];
true -> [C | tolower_s(Cs)]
end;
tolower_s([]) -> [].
-spec term_to_base64(term()) -> binary().
term_to_base64(Term) ->
encode_base64(term_to_binary(Term)).
-spec base64_to_term(binary()) -> {term, term()} | error.
base64_to_term(Base64) ->
case catch binary_to_term(decode_base64(Base64), [safe]) of
{'EXIT', _} ->
error;
Term ->
{term, Term}
end.
-spec decode_base64(binary()) -> binary().
decode_base64(S) ->
case catch binary:last(S) of
C when C == $\n; C == $\s ->
decode_base64(binary:part(S, 0, byte_size(S) - 1));
_ ->
decode_base64_bin(S, <<>>)
end.
take_without_spaces(Bin, Count) ->
take_without_spaces(Bin, Count, <<>>).
take_without_spaces(Bin, 0, Acc) ->
{Acc, Bin};
take_without_spaces(<<>>, _, Acc) ->
{Acc, <<>>};
take_without_spaces(<<$\s, Tail/binary>>, Count, Acc) ->
take_without_spaces(Tail, Count, Acc);
take_without_spaces(<<$\t, Tail/binary>>, Count, Acc) ->
take_without_spaces(Tail, Count, Acc);
take_without_spaces(<<$\n, Tail/binary>>, Count, Acc) ->
take_without_spaces(Tail, Count, Acc);
take_without_spaces(<<$\r, Tail/binary>>, Count, Acc) ->
take_without_spaces(Tail, Count, Acc);
take_without_spaces(<<Char:8, Tail/binary>>, Count, Acc) ->
take_without_spaces(Tail, Count-1, <<Acc/binary, Char:8>>).
decode_base64_bin(<<>>, Acc) ->
Acc;
decode_base64_bin(Bin, Acc) ->
case take_without_spaces(Bin, 4) of
{<<A, B, $=, $=>>, _} ->
<<Acc/binary, (d(A)):6, (d(B) bsr 4):2>>;
{<<A, B, C, $=>>, _} ->
<<Acc/binary, (d(A)):6, (d(B)):6, (d(C) bsr 2):4>>;
{<<A, B, C, D>>, Tail} ->
Acc2 = <<Acc/binary, (d(A)):6, (d(B)):6, (d(C)):6, (d(D)):6>>,
decode_base64_bin(Tail, Acc2);
_ ->
<<"">>
end.
d(X) when X >= $A, X =< $Z -> X - 65;
d(X) when X >= $a, X =< $z -> X - 71;
d(X) when X >= $0, X =< $9 -> X + 4;
d($+) -> 62;
d($/) -> 63;
d(_) -> 63.
%% Convert Erlang inet IP to list
-spec encode_base64(binary()) -> binary().
encode_base64(Data) ->
encode_base64_bin(Data, <<>>).
encode_base64_bin(<<A:6, B:6, C:6, D:6, Tail/binary>>, Acc) ->
encode_base64_bin(Tail, <<Acc/binary, (e(A)):8, (e(B)):8, (e(C)):8, (e(D)):8>>);
encode_base64_bin(<<A:6, B:6, C:4>>, Acc) ->
<<Acc/binary, (e(A)):8, (e(B)):8, (e(C bsl 2)):8, $=>>;
encode_base64_bin(<<A:6, B:2>>, Acc) ->
<<Acc/binary, (e(A)):8, (e(B bsl 4)):8, $=, $=>>;
encode_base64_bin(<<>>, Acc) ->
Acc.
e(X) when X >= 0, X < 26 -> X + 65;
e(X) when X > 25, X < 52 -> X + 71;
e(X) when X > 51, X < 62 -> X - 4;
e(62) -> $+;
e(63) -> $/;
e(X) -> exit({bad_encode_base64_token, X}).
-spec ip_to_list(inet:ip_address() | undefined |
{inet:ip_address(), inet:port_number()}) -> binary().
ip_to_list({IP, _Port}) ->
ip_to_list(IP);
%% This function clause could use inet_parse too:
ip_to_list(undefined) ->
<<"unknown">>;
ip_to_list(IP) ->
list_to_binary(inet_parse:ntoa(IP)).
-spec hex_to_bin(binary()) -> binary().
hex_to_bin(Hex) ->
hex_to_bin(binary_to_list(Hex), []).
-spec hex_to_bin(list(), list()) -> binary().
hex_to_bin([], Acc) ->
list_to_binary(lists:reverse(Acc));
hex_to_bin([H1, H2 | T], Acc) ->
{ok, [V], []} = io_lib:fread("~16u", [H1, H2]),
hex_to_bin(T, [V | Acc]).
-spec hex_to_base64(binary()) -> binary().
hex_to_base64(Hex) ->
encode_base64(hex_to_bin(Hex)).
-spec expand_keyword(binary(), binary(), binary()) -> binary().
expand_keyword(Keyword, Input, Replacement) ->
Parts = binary:split(Input, Keyword, [global]),
str:join(Parts, Replacement).
binary_to_atom(Bin) ->
erlang:binary_to_atom(Bin, utf8).
tuple_to_binary(T) ->
iolist_to_binary(tuple_to_list(T)).
atom_to_binary(A) ->
erlang:atom_to_binary(A, utf8).
expr_to_term(Expr) ->
Str = binary_to_list(<<Expr/binary, ".">>),
{ok, Tokens, _} = erl_scan:string(Str),
{ok, Term} = erl_parse:parse_term(Tokens),
Term.
term_to_expr(Term) ->
list_to_binary(io_lib:print(Term)).
l2i(I) when is_integer(I) -> I;
l2i(L) when is_binary(L) -> binary_to_integer(L).
i2l(I) when is_integer(I) -> integer_to_binary(I);
i2l(L) when is_binary(L) -> L.
i2l(I, N) when is_integer(I) -> i2l(i2l(I), N);
i2l(L, N) when is_binary(L) ->
case str:len(L) of
N -> L;
C when C > N -> L;
_ -> i2l(<<$0, L/binary>>, N)
end.
-spec encode_pid(pid()) -> binary().
encode_pid(Pid) ->
list_to_binary(erlang:pid_to_list(Pid)).
-spec decode_pid(binary(), binary()) -> pid().
decode_pid(PidBin, NodeBin) ->
PidStr = binary_to_list(PidBin),
Pid = erlang:list_to_pid(PidStr),
case erlang:binary_to_atom(NodeBin, latin1) of
Node when Node == node() ->
Pid;
Node ->
try set_node_id(PidStr, NodeBin)
catch _:badarg ->
erlang:error({bad_node, Node})
end
end.
-spec compile_exprs(module(), [string()]) -> ok | {error, any()}.
compile_exprs(Mod, Exprs) ->
try
Forms = lists:map(
fun(Expr) ->
{ok, Tokens, _} = erl_scan:string(lists:flatten(Expr)),
{ok, Form} = erl_parse:parse_form(Tokens),
Form
end, Exprs),
{ok, Code} = case compile:forms(Forms, []) of
{ok, Mod, Bin} -> {ok, Bin};
{ok, Mod, Bin, _Warnings} -> {ok, Bin};
Error -> Error
end,
{module, Mod} = code:load_binary(Mod, "nofile", Code),
ok
catch _:{badmatch, {error, ErrInfo, _ErrLocation}} ->
{error, ErrInfo};
_:{badmatch, {error, _} = Err} ->
Err;
_:{badmatch, error} ->
{error, compile_failed}
end.
%%%===================================================================
%%% Internal functions
%%%===================================================================
-spec set_node_id(string(), binary()) -> pid().
set_node_id(PidStr, NodeBin) ->
ExtPidStr = erlang:pid_to_list(
binary_to_term(
<<131,103,100,(size(NodeBin)):16,NodeBin/binary,0:72>>)),
[H|_] = string:tokens(ExtPidStr, "."),
[_|T] = string:tokens(PidStr, "."),
erlang:list_to_pid(string:join([H|T], ".")).