Make convert_to_scram work with all backends

src/ejabberd_admin.erl

@@ -269,12 +269,11 @@ get_commands_spec() ->
 			args_example = ["example.com"],
                         args = [{host, string}], result = {res, rescode}},
      #ejabberd_commands{name = convert_to_scram, tags = [sql],
-			desc = "Convert the passwords in 'users' ODBC table to SCRAM",
-			module = ejabberd_auth_sql, function = convert_to_scram,
+			desc = "Convert the passwords of users to SCRAM",
+			module = ejabberd_auth, function = convert_to_scram,
 			args_desc = ["Vhost which users' passwords will be scrammed"],
 			args_example = ["example.com"],
 			args = [{host, binary}], result = {res, rescode}},
-
      #ejabberd_commands{name = import_prosody, tags = [mnesia, sql],
 			desc = "Import data from Prosody",
 			longdesc = "Note: this method requires ejabberd compiled with optional tools support "

src/ejabberd_auth.erl

@@ -46,7 +46,7 @@
 -export([init/1, handle_call/3, handle_cast/2, handle_info/2,
 	 terminate/2, code_change/3]).
 
--export([auth_modules/1]).
+-export([auth_modules/1, convert_to_scram/1]).
 
 -include("scram.hrl").
 -include("logger.hrl").
@@ -915,3 +915,24 @@ import(Server, {sql, _}, mnesia, <<"users">>, Fields) ->
     ejabberd_auth_mnesia:import(Server, Fields);
 import(_LServer, {sql, _}, sql, <<"users">>, _) ->
     ok.
+
+-spec convert_to_scram(binary()) -> {error, any()} | ok.
+convert_to_scram(Server) ->
+    LServer = jid:nameprep(Server),
+    if
+	LServer == error;
+	LServer == <<>> ->
+	    {error, {incorrect_server_name, Server}};
+	true ->
+	    lists:foreach(
+		fun({U, S}) ->
+		    case get_password(U, S) of
+			Pass when is_binary(Pass) ->
+			    SPass = password_to_scram(Pass),
+			    set_password(U, S, SPass);
+			_ ->
+			    ok
+		    end
+		end, get_users(LServer)),
+	    ok
+    end.

src/ejabberd_auth_sql.erl

@@ -33,7 +33,7 @@
 -export([start/1, stop/1, set_password/3, try_register/3,
 	 get_users/2, count_users/2, get_password/2,
 	 remove_user/2, store_type/1, plain_password_required/1,
-	 convert_to_scram/1, export/1, which_users_exists/2]).
+	 export/1, which_users_exists/2]).
 
 -include("scram.hrl").
 -include("logger.hrl").
@@ -269,54 +269,6 @@ which_users_exists(LServer, LUsers) ->
             end
     end.
 
-
-convert_to_scram(Server) ->
-    LServer = jid:nameprep(Server),
-    if
-        LServer == error;
-        LServer == <<>> ->
-            {error, {incorrect_server_name, Server}};
-        true ->
-            F = fun () ->
-                        BatchSize = ?BATCH_SIZE,
-                        case ejabberd_sql:sql_query_t(
-                               ?SQL("select @(username)s, @(password)s"
-                                    " from users"
-                                    " where iterationcount=0 and %(LServer)H"
-                                    " limit %(BatchSize)d")) of
-                            {selected, []} ->
-                                ok;
-                            {selected, Rs} ->
-                                lists:foreach(
-                                  fun({LUser, Password}) ->
-					  case jid:resourceprep(Password) of
-					      error ->
-						  ?ERROR_MSG(
-						     "SASLprep failed for "
-						     "password of user ~ts@~ts",
-						     [LUser, LServer]);
-					      _ ->
-						  Scram = ejabberd_auth:password_to_scram(Password),
-						  set_password_scram_t(
-						    LUser, LServer,
-						    Scram#scram.storedkey,
-						    Scram#scram.serverkey,
-						    Scram#scram.salt,
-						    Scram#scram.iterationcount)
-					  end
-                                  end, Rs),
-                                continue;
-                            Err -> {bad_reply, Err}
-                        end
-                end,
-            case ejabberd_sql:sql_transaction(LServer, F) of
-                {atomic, ok} -> ok;
-                {atomic, continue} -> convert_to_scram(Server);
-                {atomic, Error} -> {error, Error};
-                Error -> Error
-            end
-    end.
-
 export(_Server) ->
     [{passwd,
       fun(Host, #passwd{us = {LUser, LServer}, password = Password})