%%%-------------------------------------------------------------------
%%% @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) 2002-2018 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, 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,
now_to_usec/1, usec_to_now/1, encode_pid/1, decode_pid/2,
compile_exprs/2, join_atoms/2, try_read_file/1, have_eimp/0,
css_dir/0, img_dir/0, js_dir/0, read_css/1, read_img/1, read_js/1]).
%% Deprecated functions
-export([decode_base64/1, encode_base64/1]).
-deprecated([{decode_base64, 1},
{encode_base64, 1}]).
-include("logger.hrl").
-include_lib("kernel/include/file.hrl").
%%%===================================================================
%%% 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) ->
try binary_to_term(base64:decode(Base64), [safe]) of
Term -> {term, Term}
catch _:badarg ->
error
end.
-spec decode_base64(binary()) -> binary().
decode_base64(S) ->
try base64:mime_decode(S)
catch _:badarg -> <<>>
end.
-spec encode_base64(binary()) -> binary().
encode_base64(Data) ->
base64:encode(Data).
-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) ->
base64:encode(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)).
-spec now_to_usec(erlang:timestamp()) -> non_neg_integer().
now_to_usec({MSec, Sec, USec}) ->
(MSec*1000000 + Sec)*1000000 + USec.
-spec usec_to_now(non_neg_integer()) -> erlang:timestamp().
usec_to_now(Int) ->
Secs = Int div 1000000,
USec = Int rem 1000000,
MSec = Secs div 1000000,
Sec = Secs rem 1000000,
{MSec, Sec, USec}.
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.
-spec join_atoms([atom()], binary()) -> binary().
join_atoms(Atoms, Sep) ->
str:join([io_lib:format("~p", [A]) || A <- Atoms], Sep).
%% @doc Checks if the file is readable and converts its name to binary.
%% Fails with `badarg` otherwise. The function is intended for usage
%% in configuration validators only.
-spec try_read_file(file:filename_all()) -> binary().
try_read_file(Path) ->
case file:open(Path, [read]) of
{ok, Fd} ->
file:close(Fd),
iolist_to_binary(Path);
{error, Why} ->
?ERROR_MSG("Failed to read ~s: ~s", [Path, file:format_error(Why)]),
erlang:error(badarg)
end.
-ifdef(GRAPHICS).
have_eimp() -> true.
-else.
have_eimp() -> false.
-endif.
-spec css_dir() -> file:filename().
css_dir() ->
case os:getenv("EJABBERD_CSS_PATH") of
false ->
case code:priv_dir(ejabberd) of
{error, _} -> filename:join(["priv", "css"]);
Path -> filename:join([Path, "css"])
end;
Path -> Path
end.
-spec img_dir() -> file:filename().
img_dir() ->
case os:getenv("EJABBERD_IMG_PATH") of
false ->
case code:priv_dir(ejabberd) of
{error, _} -> filename:join(["priv", "img"]);
Path -> filename:join([Path, "img"])
end;
Path -> Path
end.
-spec js_dir() -> file:filename().
js_dir() ->
case os:getenv("EJABBERD_JS_PATH") of
false ->
case code:priv_dir(ejabberd) of
{error, _} -> filename:join(["priv", "js"]);
Path -> filename:join([Path, "js"])
end;
Path -> Path
end.
-spec read_css(file:filename()) -> {ok, binary()} | {error, file:posix()}.
read_css(File) ->
read_file(filename:join(css_dir(), File)).
-spec read_img(file:filename()) -> {ok, binary()} | {error, file:posix()}.
read_img(File) ->
read_file(filename:join(img_dir(), File)).
-spec read_js(file:filename()) -> {ok, binary()} | {error, file:posix()}.
read_js(File) ->
read_file(filename:join(js_dir(), File)).
%%%===================================================================
%%% 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], ".")).
-spec read_file(file:filename()) -> {ok, binary()} | {error, file:posix()}.
read_file(Path) ->
case file:read_file(Path) of
{ok, Data} ->
{ok, Data};
{error, Why} = Err ->
?ERROR_MSG("Failed to read file ~s: ~s",
[Path, file:format_error(Why)]),
Err
end.
