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%%% Copyright (c) 2014, NORDUnet A/S.
%%% See LICENSE for licensing information.
%%% @doc Frontend node API
-module(frontend).
%% API (URL)
-export([sendlog/3, missingentries/3, sendentry/3, sendsth/3, currentposition/3]).
sendentry(SessionID, _Env, Input) ->
R = (catch case (catch jiffy:decode(Input)) of
{error, E} ->
html("sendentry: bad input:", E);
{PropList} ->
LogEntry = base64:decode(proplists:get_value(<<"entry">>, PropList)),
TreeLeafHash = base64:decode(proplists:get_value(<<"treeleafhash">>, PropList)),
ok = db:add(TreeLeafHash, LogEntry),
binary_to_list(
jiffy:encode(
{[{result, <<"ok">>}]}))
end),
deliver(SessionID, R).
sendlog(SessionID, _Env, Input) ->
R = (catch case (catch jiffy:decode(Input)) of
{error, E} ->
html("sendentry: bad input:", E);
{PropList} ->
Start = proplists:get_value(<<"start">>, PropList),
Hashes = lists:map(fun (S) -> base64:decode(S) end, proplists:get_value(<<"hashes">>, PropList)),
Indices = lists:seq(Start, Start + length(Hashes) - 1),
lists:foreach(fun ({Hash, Index}) ->
ok = db:add_index(Hash, Index)
end, lists:zip(Hashes, Indices)),
binary_to_list(
jiffy:encode(
{[{result, <<"ok">>}]}))
end),
deliver(SessionID, R).
sendsth(SessionID, _Env, Input) ->
R = (catch case (catch jiffy:decode(Input)) of
{error, E} ->
html("sendentry: bad input:", E);
{PropList} ->
Treesize = proplists:get_value(<<"tree_size">>, PropList),
ok = db:set_treesize(Treesize),
ht:reset_tree([db:size() - 1]),
binary_to_list(
jiffy:encode(
{[{result, <<"ok">>}]}))
end),
deliver(SessionID, R).
currentposition(SessionID, _Env, _Input) ->
Size = db:size(),
R = binary_to_list(
jiffy:encode(
{[{result, <<"ok">>}, {position, Size}]})),
deliver(SessionID, R).
fetchmissingentries(Index) ->
lists:reverse(fetchmissingentries(Index, [])).
fetchmissingentries(Index, Acc) ->
case db:leafhash_for_index(Index) of
noentry ->
Acc;
Hash ->
case db:entry_for_leafhash(Hash) of
noentry ->
fetchmissingentries(Index + 1, [Hash | Acc]);
_ ->
fetchmissingentries(Index + 1, Acc)
end
end.
missingentries(SessionID, _Env, _Input) ->
Size = db:size(),
Missing = fetchmissingentries(Size),
R = binary_to_list(
jiffy:encode(
{[{result, <<"ok">>}, {entries, Missing}]})),
deliver(SessionID, R).
%% Private functions.
html(Text, Input) ->
io_lib:format(
"Content-Type: text/html\r\n\r\n" ++
"<html><body><p>~n" ++
"~s~n" ++
"~p~n" ++
"</body></html>~n", [Text, Input]).
-spec deliver(any(), string()) -> ok | {error, _Reason}.
deliver(Session, Data) ->
mod_esi:deliver(Session, Data).
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