fix(upload certs): fix external dependency

apps/emqx/src/emqx_authentication.erl

@@ -666,7 +666,7 @@ generate_filename(Key) ->
                  <<"certfile">> -> "cert-";
                  <<"cacertfile">> -> "cacert-"
              end,
-    to_bin(filename:join([emqx:get_config([node, data_dir]), "certs/authn", Prefix ++ emqx_plugin_libs_id:gen() ++ ".pem"])).
+    to_bin(filename:join([emqx:get_config([node, data_dir]), "certs/authn", Prefix ++ emqx_misc:gen() ++ ".pem"])).
 
 diff_certs(NewSSLOpts, OldSSLOpts) ->
     Keys = [<<"cacertfile">>, <<"certfile">>, <<"keyfile">>],

apps/emqx/src/emqx_misc.erl

@@ -45,6 +45,8 @@
         , index_of/2
         , maybe_parse_ip/1
         , ipv6_probe/1
+        , gen/0
+        , gen/1
         ]).
 
 -export([ bin2hexstr_A_F/1
@@ -52,6 +54,8 @@
         , hexstr2bin/1
         ]).
 
+-define(SHORT, 8).
+
 %% @doc Parse v4 or v6 string format address to tuple.
 %% `Host' itself is returned if it's not an ip string.
 maybe_parse_ip(Host) ->
@@ -298,6 +302,39 @@ hexchar2int(I) when I >= $0 andalso I =< $9 -> I - $0;
 hexchar2int(I) when I >= $A andalso I =< $F -> I - $A + 10;
 hexchar2int(I) when I >= $a andalso I =< $f -> I - $a + 10.
 
+-spec(gen() -> list()).
+gen() ->
+    gen(?SHORT).
+
+-spec(gen(integer()) -> list()).
+gen(Len) ->
+    BitLen = Len * 4,
+    <<R:BitLen>> = crypto:strong_rand_bytes(Len div 2),
+    int_to_hex(R, Len).
+
+%%------------------------------------------------------------------------------
+%% Internal Functions
+%%------------------------------------------------------------------------------
+
+int_to_hex(I, N) when is_integer(I), I >= 0 ->
+    int_to_hex([], I, 1, N).
+
+int_to_hex(L, I, Count, N)
+    when I < 16 ->
+    pad([int_to_hex(I) | L], N - Count);
+int_to_hex(L, I, Count, N) ->
+    int_to_hex([int_to_hex(I rem 16) | L], I div 16, Count + 1, N).
+
+int_to_hex(I) when 0 =< I, I =< 9 ->
+    I + $0;
+int_to_hex(I) when 10 =< I, I =< 15 ->
+    (I - 10) + $a.
+
+pad(L, 0) ->
+    L;
+pad(L, Count) ->
+    pad([$0 | L], Count - 1).
+
 -ifdef(TEST).
 -include_lib("eunit/include/eunit.hrl").