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.eunit
deps
*.o
*.beam
*.plt
*.swp
erl_crash.dump
ebin/*.beam
doc/*.html
doc/*.css
doc/edoc-info
doc/erlang.png
rel/example_project
.concrete/DEV_MODE
.rebar

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{"src/*", [debug_info, {i, "include/"}, {outdir, "ebin/"}]}.

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You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU GPL, see
<https://www.gnu.org/licenses/>.
The GNU General Public License does not permit incorporating your program
into proprietary programs. If your program is a subroutine library, you
may consider it more useful to permit linking proprietary applications with
the library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License. But first, please read
<https://www.gnu.org/licenses/why-not-lgpl.html>.

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{application,clutch,
[{description,"A desktop client for the Gajumaru network of blockchain networks"},
{registered,[]},
{included_applications,[]},
{applications,[stdlib,kernel]},
{vsn,"0.1.0"},
{modules,[clutch,gmc_con,gmc_gui,gmc_sup]},
{mod,{clutch,[]}}]}.

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-record(ak,
{name = "" :: string(),
id = <<>> :: clutch:id(),
balance = 0 :: non_neg_integer(),
history = [] :: [clutch:tx()],
checked = never :: never | clutch:ts()}).
-record(tx,
{id = none :: none | clutch:id(),
amount = 0 :: non_neg_integer(),
type = spend :: spend | atom()}).
-record(key,
{name = "" :: string(),
id = <<>> :: clutch:id(),
pair = #{} :: #{public := binary(), secret := binary()},
type = {eddsa, 256} :: {Cipher :: atom, Bitsize :: pos_integer()}}).

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%%% @doc
%%% Clutch
%%% @end
-module(clutch).
-vsn("0.1.0").
-behavior(application).
-author("Craig Everett <craigeverett@qpq.swiss>").
-copyright("Craig Everett <craigeverett@qpq.swiss>").
-license("GPL-3.0-or-later").
-export([ts/0]).
-export([start/2, stop/1]).
-export_type([id/0, key/0, ak/0, tx/0, ts/0]).
-include("$zx_include/zx_logger.hrl").
-include("gmc.hrl").
-type id() :: binary().
-type key() :: #key{}.
-type ak() :: #ak{}.
-type tx() :: #tx{}.
-type ts() :: integer().
ts() ->
erlang:system_time(nanosecond).
-spec start(normal, Args :: term()) -> {ok, pid()}.
%% @private
%% Called by OTP to kick things off. This is for the use of the "application" part of
%% OTP, not to be called by user code.
%%
%% NOTE:
%% The commented out second argument would come from ebin/clutch.app's 'mod'
%% section, which is difficult to define dynamically so is not used by default
%% here (if you need this, you already know how to change it).
%%
%% Optional runtime arguments passed in at start time can be obtained by calling
%% zx_daemon:argv/0 anywhere in the body of the program.
%%
%% See: http://erlang.org/doc/apps/kernel/application.html
start(normal, _Args) ->
ok =
case net_kernel:stop() of
ok ->
log(info, "SAFE: This node is running standalone.");
{error, not_found} ->
log(warning, "SAFETY: Distribution has been disabled on this node.");
{error, not_allowed} ->
ok = tell(error, "DANGER! This node is in distributed mode!"),
init:stop(1)
end,
ok = application:ensure_started(zxwidgets),
gmc_sup:start_link().
-spec stop(term()) -> ok.
%% @private
%% Similar to start/2 above, this is to be called by the "application" part of OTP,
%% not client code. Causes a (hopefully graceful) shutdown of the application.
stop(_State) ->
ok.

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%%% @doc
%%% Clutch Controller
%%%
%%% This process is a in charge of maintaining the program's state.
%%% @end
-module(gmc_con).
-vsn("0.1.0").
-author("Craig Everett <craigeverett@qpq.swiss>").
-copyright("Craig Everett <craigeverett@qpq.swiss>").
-license("GPL-3.0-or-later").
-behavior(gen_server).
-export([make_key/6, recover_key/1, mnemonic/1, rename_key/2, drop_key/1,
login/1, password/2]). % add_key/1, drop_key/1]).
-export([encrypt/2, decrypt/2]).
-export([start_link/0, stop/0, save/1]).
-export([init/1, terminate/2, code_change/3,
handle_call/3, handle_cast/2, handle_info/2]).
-include("$zx_include/zx_logger.hrl").
-include("gmc.hrl").
%%% Type and Record Definitions
-record(s,
{window = none :: none | wx:wx_object(),
accounts = [] :: [clutch:ak()],
pass = none :: none | binary(),
keys = [] :: [clutch:key()],
chains = [] :: [chain()],
prefs = #{} :: #{atom() := term()}}).
-record(chain,
{id = "" :: string(),
nodes = [] :: [address()],
mdws = [] :: [address()]}).
-type state() :: #s{}.
-type chain() :: tuple().
-type address() :: {inet:ip_address(), inet:port_number()}.
%% Interface
-spec make_key(Type, Size, Name, Seed, Encoding, Transform) -> ok
when Type :: {eddsa, ed25519},
Size :: 256,
Name :: string(),
Seed :: string(),
Encoding :: utf8 | base64 | base58,
Transform :: raw | {Algo, Yugeness},
Algo :: sha3 | sha2 | x_or | pbkdf2,
Yugeness :: rand | non_neg_integer().
%% @doc
%% Generate a new key.
%% The magic first two args are here because `ak_*' basically has no option other than
%% to mean a 256 bit key based on Curve 25519. When more key varieties are added to the
%% system this will change quite a lot.
make_key({eddsa, ed25519}, 256, Name, Seed, Encoding, Transform) ->
gen_server:cast(?MODULE, {make_key, Name, Seed, Encoding, Transform}).
-spec recover_key(Mnemonic) -> ok
when Mnemonic :: string().
recover_key(Mnemonic) ->
gen_server:cast(?MODULE, {recover_key, Mnemonic}).
-spec mnemonic(ID) -> {ok, Mnemonic} | error
when ID :: clutch:id(),
Mnemonic :: string().
mnemonic(ID) ->
gen_server:call(?MODULE, {mnemonic, ID}).
-spec rename_key(ID, NewName) -> ok
when ID :: clutch:id(),
NewName :: string().
rename_key(ID, NewName) ->
gen_server:cast(?MODULE, {rename_key, ID, NewName}).
-spec drop_key(ID) -> ok
when ID :: clutch:id().
drop_key(ID) ->
gen_server:cast(?MODULE, {drop_key, ID}).
-spec stop() -> ok.
stop() ->
gen_server:cast(?MODULE, stop).
-spec login(Phrase) -> ok
when Phrase :: string().
login(Phrase) ->
gen_server:cast(?MODULE, {login, Phrase}).
-spec password(Old, New) -> ok
when Old :: none | string(),
New :: none | string().
password(Old, New) ->
gen_server:cast(?MODULE, {password, Old, New}).
-spec save(Prefs) -> ok | {error, Reason}
when Prefs :: #{atom() := term()},
Reason :: file:posix().
save(Prefs) ->
gen_server:call(?MODULE, {save, Prefs}).
%%% Startup Functions
-spec start_link() -> Result
when Result :: {ok, pid()}
| {error, Reason},
Reason :: {already_started, pid()}
| {shutdown, term()}
| term().
%% @private
%% Called by gmc_sup.
start_link() ->
gen_server:start_link({local, ?MODULE}, ?MODULE, none, []).
-spec init(none) -> {ok, state()}.
init(none) ->
ok = log(info, "Starting"),
Prefs = read_prefs(),
Window = gmc_gui:start_link(Prefs),
ok = log(info, "Window: ~p", [Window]),
ok = gmc_gui:ask_password(),
State = #s{window = Window},
ArgV = zx_daemon:argv(),
ok = gmc_gui:show(ArgV),
{ok, State}.
read_prefs() ->
case file:consult(prefs_path()) of
{ok, Prefs} ->
proplists:to_map(Prefs);
_ ->
#{selected => 0,
lang => en_us,
geometry => none}
end.
%%% gen_server Message Handling Callbacks
-spec handle_call(Message, From, State) -> Result
when Message :: term(),
From :: {pid(), reference()},
State :: state(),
Result :: {reply, Response, NewState}
| {noreply, State},
Response :: ok
| {error, {listening, inet:port_number()}},
NewState :: state().
%% @private
%% The gen_server:handle_call/3 callback.
%% See: http://erlang.org/doc/man/gen_server.html#Module:handle_call-3
handle_call({save, Prefs}, _, State) ->
Response = do_save(State#s{prefs = Prefs}),
{reply, Response, State};
handle_call({mnemonic, ID}, _, State) ->
Response = do_mnemonic(ID, State),
{reply, Response, State};
handle_call(Unexpected, From, State) ->
ok = log(warning, "Unexpected call from ~tp: ~tp~n", [From, Unexpected]),
{noreply, State}.
-spec handle_cast(Message, State) -> {noreply, NewState}
when Message :: term(),
State :: state(),
NewState :: state().
%% @private
%% The gen_server:handle_cast/2 callback.
%% See: http://erlang.org/doc/man/gen_server.html#Module:handle_cast-2
handle_cast({make_key, Name, Seed, Encoding, Transform}, State) ->
NewState = do_make_key(Name, Seed, Encoding, Transform, State),
{noreply, NewState};
handle_cast({recover_key, Mnemonic}, State) ->
NewState = do_recover_key(Mnemonic, State),
{noreply, NewState};
handle_cast({rename_key, ID, NewName}, State) ->
NewState = do_rename_key(ID, NewName, State),
{noreply, NewState};
handle_cast({drop_key, ID}, State) ->
NewState = do_drop_key(ID, State),
{noreply, NewState};
handle_cast({login, Phrase}, State) ->
NewState = do_login(Phrase, State),
{noreply, NewState};
handle_cast({password, Old, New}, State) ->
NewState = do_password(Old, New, State),
{noreply, NewState};
handle_cast(stop, State) ->
ok = log(info, "Received a 'stop' message."),
{stop, normal, State};
handle_cast(Unexpected, State) ->
ok = tell(warning, "Unexpected cast: ~tp~n", [Unexpected]),
{noreply, State}.
-spec handle_info(Message, State) -> {noreply, NewState}
when Message :: term(),
State :: state(),
NewState :: state().
%% @private
%% The gen_server:handle_info/2 callback.
%% See: http://erlang.org/doc/man/gen_server.html#Module:handle_info-2
handle_info(Unexpected, State) ->
ok = log(warning, "Unexpected info: ~tp~n", [Unexpected]),
{noreply, State}.
%% @private
%% gen_server callback to handle state transformations necessary for hot
%% code updates. This template performs no transformation.
code_change(_, State, _) ->
{ok, State}.
terminate(Reason, State) ->
ok = log(info, "Reason: ~tp, State: ~tp", [Reason, State]),
zx:stop().
%%%
do_make_key(Name, <<>>, _, Transform, State) ->
Bin = crypto:strong_rand_bytes(32),
do_make_key2(Name, Bin, Transform, State);
do_make_key(Name, Seed, utf8, Transform, State) ->
Bin = unicode:characters_to_binary(Seed),
do_make_key2(Name, Bin, Transform, State);
do_make_key(Name, Seed, base64, Transform, State) ->
case base64_decode(Seed) of
{ok, Bin} ->
do_make_key2(Name, Bin, Transform, State);
{error, Reason} ->
ok = gmc_gui:notify({error, {base64, Reason}}),
State
end;
do_make_key(Name, Seed, base58, Transform, State) ->
case base58:check_base58(Seed) of
true ->
Bin = base58:base58_to_binary(Seed),
do_make_key2(Name, Bin, Transform, State);
false ->
ok = gmc_gui:notify({error, {base58, badarg}}),
State
end.
do_make_key2(Name, Bin, Transform, State = #s{accounts = Accounts, keys = Keys}) ->
T = transform(Transform),
Seed = T(Bin),
Key = #key{name = KeyName, id = ID} = gmc_key_master:make_key(Name, Seed),
Account = #ak{name = KeyName, id = ID},
NewKeys = [Key | Keys],
NewAccounts = [Account | Accounts],
ok = gmc_gui:show(NewAccounts),
State#s{accounts = NewAccounts, keys = NewKeys}.
base64_decode(String) ->
try
{ok, base64:decode(String)}
catch
E:R -> {E, R}
end.
transform({sha3, 256}) ->
fun(D) -> crypto:hash(sha3_256, D) end;
transform({sha2, 256}) ->
fun(D) -> crypto:hash(sha256, D) end;
transform({x_or, 256}) ->
fun t_xor/1;
transform(raw) ->
fun(D) -> D end.
t_xor(Bin) -> t_xor(Bin, <<0:256>>).
t_xor(<<H:32/binary, T/binary>>, A) ->
t_xor(T, crypto:exor(H, A));
t_xor(<<>>, A) ->
A;
t_xor(B, A) ->
H = <<0:(256 - bit_size(B)), B/binary>>,
crypto:exor(H, A).
do_recover_key(Mnemonic, State = #s{keys = Keys, accounts = Accounts}) ->
case gmc_key_master:decode(Mnemonic) of
{ok, Seed} ->
do_recover_key2(Seed, State);
Error ->
ok = gmc_gui:notify(Error),
State
end.
do_recover_key2(Seed, State = #s{keys = Keys, accounts = Accounts}) ->
Recovered = #key{id = ID, name = Name} = gmc_key_master:make_key("", Seed),
case lists:keymember(ID, #key.id, Keys) of
false ->
NewKeys = [Recovered | Keys],
Account = #ak{name = Name, id = ID},
NewAccounts = [Account | Accounts],
ok = gmc_gui:show(NewAccounts),
State#s{accounts = NewAccounts, keys = NewKeys};
true ->
State
end.
do_mnemonic(ID, #s{keys = Keys}) ->
case lists:keyfind(ID, #key.id, Keys) of
#key{pair = #{secret := <<K:32/binary, _/binary>>}} ->
Mnemonic = gmc_key_master:encode(K),
{ok, Mnemonic};
false ->
{error, bad_key}
end.
do_rename_key(ID, NewName, State = #s{accounts = Accounts, keys = Keys}) ->
A = lists:keyfind(ID, #ak.id, Accounts),
K = lists:keyfind(ID, #key.id, Keys),
NewAccounts = lists:keystore(ID, #ak.id, Accounts, A#ak{name = NewName}),
NewKeys = lists:keystore(ID, #key.id, Keys, K#key{name = NewName}),
ok = gmc_gui:show(NewAccounts),
State#s{accounts = NewAccounts, keys = NewKeys}.
do_drop_key(ID, State = #s{accounts = Accounts, keys = Keys}) ->
NewAccounts = lists:keydelete(ID, #ak.id, Accounts),
NewKeys = lists:keydelete(ID, #key.id, Keys),
ok = gmc_gui:show(NewAccounts),
State#s{accounts = NewAccounts, keys = NewKeys}.
encrypt(Pass, Binary) ->
Flags = [{encrypt, true}, {padding, pkcs_padding}],
crypto:crypto_one_time(aes_256_ecb, Pass, Binary, Flags).
decrypt(Pass, Binary) ->
Flags = [{encrypt, false}, {padding, pkcs_padding}],
crypto:crypto_one_time(aes_256_ecb, Pass, Binary, Flags).
pass(Phrase) ->
crypto:hash(sha3_256, Phrase).
do_login(none, State) ->
case read(none) of
{ok, Recovered = #s{accounts = Accounts}} ->
ok = gmc_gui:show(Accounts),
Recovered;
error ->
State
end;
do_login(Phrase, State = #s{pass = none}) ->
Pass = pass(Phrase),
try
case read(Pass) of
{ok, Recovered = #s{accounts = Accounts}} ->
ok = gmc_gui:show(Accounts),
Recovered;
error ->
State#s{pass = Pass}
end
catch
E:R ->
ok = tell("Problem with loading state: {~p, ~p}", [E, R]),
ok = gmc_gui:ask_password(),
State
end.
do_password(none, none, State) ->
State;
do_password(none, New, State = #s{pass = none}) ->
Pass = pass(New),
State#s{pass = Pass};
do_password(Old, none, State = #s{pass = Pass}) ->
case pass(Old) =:= Pass of
true -> State#s{pass = none};
false -> State
end;
do_password(Old, New, State = #s{pass = Pass}) ->
case pass(Old) =:= Pass of
true -> State#s{pass = pass(New)};
false -> State
end.
do_save(State = #s{prefs = Prefs}) ->
ok = persist(Prefs),
do_save2(State).
do_save2(State = #s{pass = none}) ->
Path = save_path(),
ok = filelib:ensure_dir(Path),
file:write_file(Path, term_to_binary(State));
do_save2(State = #s{pass = Pass}) ->
Path = save_path(),
ok = filelib:ensure_dir(Path),
Cipher = encrypt(Pass, term_to_binary(State)),
file:write_file(Path, Cipher).
read(none) ->
case file:read_file(save_path()) of
{ok, Bin} -> {ok, binary_to_term(Bin)};
{error, enoent} -> error
end;
read(Pass) ->
case file:read_file(save_path()) of
{ok, Cipher} -> {ok, binary_to_term(decrypt(Pass, Cipher))};
{error, enoent} -> error
end.
save_path() ->
filename:join(zx_lib:path(var, "otpr", "clutch"), "opaque.data").
persist(Prefs) ->
Path = prefs_path(),
ok = filelib:ensure_dir(Path),
zx_lib:write_terms(Path, proplists:from_map(Prefs)).
prefs_path() ->
filename:join(zx_lib:path(etc, "otpr", "clutch"), "prefs.eterms").

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%%% @doc
%%% Clutch GUI
%%%
%%% This process is responsible for creating the main GUI frame displayed to the user.
%%%
%%% Reference: http://erlang.org/doc/man/wx_object.html
%%% @end
-module(gmc_gui).
-vsn("0.1.0").
-author("Craig Everett <craigeverett@qpq.swiss>").
-copyright("Craig Everett <craigeverett@qpq.swiss>").
-license("GPL-3.0-or-later").
-behavior(wx_object).
-include_lib("wx/include/wx.hrl").
-export([show/1, notify/1, ask_password/0]).
-export([start_link/1]).
-export([init/1, terminate/2, code_change/3,
handle_call/3, handle_cast/2, handle_info/2, handle_event/2]).
-include("$zx_include/zx_logger.hrl").
-include("gmc.hrl").
-record(w,
{name = none :: atom(),
id = 0 :: integer(),
wx = none :: wx:wx_object()}).
-record(s,
{wx = none :: none | wx:wx_object(),
frame = none :: none | wx:wx_object(),
lang = en :: en | jp,
j = none :: none | fun(),
prefs = #{} :: #{atom() := term()},
accounts = [] :: [clutch:ak()],
picker = none :: none | wx:wx_object(),
id = {#w{}, #w{}} :: labeled(),
balance = {#w{}, #w{}} :: labeled(),
buttons = [] :: [widget()]}).
-type state() :: term().
-type widget() :: #w{}.
-type labeled() :: {Label :: #w{}, Control :: #w{}}.
%%% Interface functions
show(Accounts) ->
wx_object:cast(?MODULE, {show, Accounts}).
notify(Message) ->
wx_object:cast(?MODULE, {notify, Message}).
ask_password() ->
wx_object:cast(?MODULE, password).
%%% Startup Functions
start_link(Accounts) ->
wx_object:start_link({local, ?MODULE}, ?MODULE, Accounts, []).
init(Prefs) ->
ok = log(info, "GUI starting..."),
Lang = maps:get(lang, Prefs, en_us),
Trans = gmc_jt:read_translations(?MODULE),
J = gmc_jt:j(Lang, Trans),
Wx = wx:new(),
Frame = wxFrame:new(Wx, ?wxID_ANY, J("Gajumaru Clutch")),
MainSz = wxBoxSizer:new(?wxVERTICAL),
Picker = wxListBox:new(Frame, ?wxID_ANY, [{style, ?wxLC_SINGLE_SEL}]),
ID_L = wxStaticText:new(Frame, ?wxID_ANY, J("Account ID: ")),
ID_T = wxStaticText:new(Frame, ?wxID_ANY, ""),
ID_W =
{#w{id = wxStaticText:getId(ID_L), wx = ID_L},
#w{id = wxStaticText:getId(ID_T), wx = ID_T}},
ID_Sz = wxBoxSizer:new(?wxHORIZONTAL),
_ = wxSizer:add(ID_Sz, ID_L, zxw:flags(base)),
_ = wxSizer:add(ID_Sz, ID_T, zxw:flags(wide)),
BalanceL = wxStaticText:new(Frame, ?wxID_ANY, "木"),
BalanceT = wxStaticText:new(Frame, ?wxID_ANY, price_to_string(0)),
Balance =
{#w{id = wxStaticText:getId(BalanceL), wx = BalanceL},
#w{id = wxStaticText:getId(BalanceT), wx = BalanceT}},
BalanceSz = wxBoxSizer:new(?wxHORIZONTAL),
_ = wxSizer:add(BalanceSz, BalanceL, zxw:flags(base)),
_ = wxSizer:add(BalanceSz, BalanceT, zxw:flags(wide)),
ButtonTemplates =
[{make_key, J("Create")},
{recover, J("Recover")},
{mnemonic, J("Mnemonic")},
{rename, J("Rename")},
{drop_key, J("Delete")},
{send, J("Send Money")},
{recv, J("Receive Money")},
{grids, J("GRIDS URL")},
{refresh, J("Refresh")}],
MakeButton =
fun({Name, Label}) ->
B = wxButton:new(Frame, ?wxID_ANY, [{label, Label}]),
#w{name = Name, id = wxButton:getId(B), wx = B}
end,
Buttons = lists:map(MakeButton, ButtonTemplates),
AccountSz = wxBoxSizer:new(?wxHORIZONTAL),
ActionsSz = wxBoxSizer:new(?wxHORIZONTAL),
HistorySz = wxBoxSizer:new(?wxVERTICAL),
#w{wx = MakeBn} = lists:keyfind(make_key, #w.name, Buttons),
#w{wx = RecoBn} = lists:keyfind(recover, #w.name, Buttons),
#w{wx = MnemBn} = lists:keyfind(mnemonic, #w.name, Buttons),
#w{wx = Rename} = lists:keyfind(rename, #w.name, Buttons),
#w{wx = DropBn} = lists:keyfind(drop_key, #w.name, Buttons),
_ = wxSizer:add(AccountSz, MakeBn, zxw:flags(wide)),
_ = wxSizer:add(AccountSz, RecoBn, zxw:flags(wide)),
_ = wxSizer:add(AccountSz, MnemBn, zxw:flags(wide)),
_ = wxSizer:add(AccountSz, Rename, zxw:flags(wide)),
_ = wxSizer:add(AccountSz, DropBn, zxw:flags(wide)),
#w{wx = SendBn} = lists:keyfind(send, #w.name, Buttons),
#w{wx = RecvBn} = lists:keyfind(recv, #w.name, Buttons),
#w{wx = GridsBn} = lists:keyfind(grids, #w.name, Buttons),
_ = wxSizer:add(ActionsSz, SendBn, zxw:flags(wide)),
_ = wxSizer:add(ActionsSz, RecvBn, zxw:flags(wide)),
_ = wxSizer:add(ActionsSz, GridsBn, zxw:flags(wide)),
#w{wx = Refresh} = lists:keyfind(refresh, #w.name, Buttons),
_ = wxSizer:add(HistorySz, Refresh, zxw:flags(base)),
_ = wxSizer:add(MainSz, AccountSz, zxw:flags(base)),
_ = wxSizer:add(MainSz, Picker, zxw:flags(wide)),
_ = wxSizer:add(MainSz, ID_Sz, zxw:flags(base)),
_ = wxSizer:add(MainSz, BalanceSz, zxw:flags(base)),
_ = wxSizer:add(MainSz, ActionsSz, zxw:flags(base)),
_ = wxSizer:add(MainSz, HistorySz, [{proportion, 3}, {flag, ?wxEXPAND}]),
ok = wxFrame:setSizer(Frame, MainSz),
ok = wxSizer:layout(MainSz),
ok =
case safe_size(Prefs) of
{pref, max} ->
wxTopLevelWindow:maximize(Frame);
{pref, WSize} ->
wxFrame:setSize(Frame, WSize);
{center, WSize} ->
ok = wxFrame:setSize(Frame, WSize),
wxFrame:center(Frame)
end,
ok = wxFrame:connect(Frame, command_button_clicked),
ok = wxFrame:connect(Frame, close_window),
true = wxFrame:show(Frame),
ok = wxListBox:connect(Picker, command_listbox_selected),
State = #s{wx = Wx, frame = Frame, lang = Lang, j = J, prefs = Prefs,
accounts = [],
picker = Picker,
id = ID_W,
balance = Balance,
buttons = Buttons},
{Frame, State}.
safe_size(Prefs) ->
Display = wxDisplay:new(),
GSize = wxDisplay:getGeometry(Display),
CSize = wxDisplay:getClientArea(Display),
PPI =
try
wxDisplay:getPPI(Display)
catch
Class:Exception -> {Class, Exception}
end,
ok = log(info, "Geometry: ~p", [GSize]),
ok = log(info, "ClientArea: ~p", [CSize]),
ok = log(info, "PPI: ~p", [PPI]),
Geometry =
case maps:find(geometry, Prefs) of
{ok, none} ->
{X, Y, _, _} = GSize,
{center, {X, Y, 420, 520}};
{ok, G} ->
{pref, G};
error ->
{X, Y, _, _} = GSize,
{center, {X, Y, 420, 520}}
end,
ok = wxDisplay:destroy(Display),
Geometry.
-spec handle_call(Message, From, State) -> Result
when Message :: term(),
From :: {pid(), reference()},
State :: state(),
Result :: {reply, Response, NewState}
| {noreply, State},
Response :: ok
| {error, {listening, inet:port_number()}},
NewState :: state().
handle_call(Unexpected, From, State) ->
ok = log(warning, "Unexpected call from ~tp: ~tp~n", [From, Unexpected]),
{noreply, State}.
-spec handle_cast(Message, State) -> {noreply, NewState}
when Message :: term(),
State :: state(),
NewState :: state().
%% @private
%% The gen_server:handle_cast/2 callback.
%% See: http://erlang.org/doc/man/gen_server.html#Module:handle_cast-2
handle_cast({show, Accounts}, State) ->
NewState = do_show(Accounts, State),
{noreply, NewState};
handle_cast(password, State) ->
ok = do_ask_password(State),
{noreply, State};
handle_cast(Unexpected, State) ->
ok = log(warning, "Unexpected cast: ~tp~n", [Unexpected]),
{noreply, State}.
-spec handle_info(Message, State) -> {noreply, NewState}
when Message :: term(),
State :: state(),
NewState :: state().
%% @private
%% The gen_server:handle_info/2 callback.
%% See: http://erlang.org/doc/man/gen_server.html#Module:handle_info-2
handle_info(Unexpected, State) ->
ok = log(warning, "Unexpected info: ~tp~n", [Unexpected]),
{noreply, State}.
-spec handle_event(Event, State) -> {noreply, NewState}
when Event :: term(),
State :: state(),
NewState :: state().
%% @private
%% The wx_object:handle_event/2 callback.
%% See: http://erlang.org/doc/man/gen_server.html#Module:handle_info-2
handle_event(#wx{event = #wxCommand{type = command_button_clicked},
id = ID},
State = #s{buttons = Buttons}) ->
NewState =
case lists:keyfind(ID, #w.id, Buttons) of
#w{name = make_key} -> make_key(State);
#w{name = recover} -> recover_key(State);
#w{name = mnemonic} -> show_mnemonic(State);
#w{name = rename} -> rename_key(State);
#w{name = drop_key} -> drop_key(State);
#w{name = grids} -> grids_dialogue(State);
#w{name = Name} -> handle_button(Name, State);
false -> State
end,
{noreply, NewState};
handle_event(#wx{event = #wxCommand{type = command_listbox_selected,
commandInt = Selected}},
State) ->
NewState = do_selection(Selected, State),
{noreply, NewState};
handle_event(#wx{event = #wxClose{}}, State = #s{frame = Frame, prefs = Prefs}) ->
Geometry =
case wxTopLevelWindow:isMaximized(Frame) of
true ->
max;
false ->
{X, Y} = wxWindow:getPosition(Frame),
{W, H} = wxWindow:getSize(Frame),
{X, Y, W, H}
end,
NewPrefs = maps:put(geometry, Geometry, Prefs),
ok = gmc_con:save(NewPrefs),
ok = gmc_con:stop(),
ok = wxWindow:destroy(Frame),
{noreply, State};
handle_event(Event, State) ->
ok = tell(info, "Unexpected event ~tp State: ~tp~n", [Event, State]),
{noreply, State}.
code_change(_, State, _) ->
{ok, State}.
terminate(Reason, State) ->
ok = log(info, "Reason: ~tp, State: ~tp", [Reason, State]),
wx:destroy().
%%% Doers
make_key(State = #s{frame = Frame, j = J}) ->
Dialog = wxDialog:new(Frame, ?wxID_ANY, J("New Key")),
Sizer = wxBoxSizer:new(?wxVERTICAL),
NameSz = wxStaticBoxSizer:new(?wxVERTICAL, Dialog, [{label, J("Name (Optional)")}]),
NameTx = wxTextCtrl:new(Dialog, ?wxID_ANY),
SeedSz = wxStaticBoxSizer:new(?wxVERTICAL, Dialog, [{label, J("Seed (Optional)")}]),
SeedTx = wxTextCtrl:new(Dialog, ?wxID_ANY, [{style, ?wxDEFAULT bor ?wxTE_MULTILINE}]),
ok = wxTextCtrl:setValue(SeedTx, base64:encode(crypto:strong_rand_bytes(64))),
OptionsSz = wxStaticBoxSizer:new(?wxHORIZONTAL, Dialog, [{label, J("Options")}]),
Encodings =
["Base64",
"UTF-8",
"Base58"],
EncodingOptions = wxChoice:new(Dialog, ?wxID_ANY, [{choices, Encodings}]),
ok = wxChoice:setSelection(EncodingOptions, 0),
Transforms =
["SHA-3 (256)",
"SHA-2 (256)",
"XOR",
"Direct Input (no transform)"],
TransformOptions = wxChoice:new(Dialog, ?wxID_ANY, [{choices, Transforms}]),
ok = wxChoice:setSelection(TransformOptions, 0),
ButtSz = wxBoxSizer:new(?wxHORIZONTAL),
Affirm = wxButton:new(Dialog, ?wxID_OK),
Cancel = wxButton:new(Dialog, ?wxID_CANCEL),
_ = wxBoxSizer:add(ButtSz, Affirm, zxw:flags(wide)),
_ = wxBoxSizer:add(ButtSz, Cancel, zxw:flags(wide)),
_ = wxStaticBoxSizer:add(NameSz, NameTx, zxw:flags(base)),
_ = wxStaticBoxSizer:add(SeedSz, SeedTx, zxw:flags(wide)),
_ = wxStaticBoxSizer:add(OptionsSz, EncodingOptions, zxw:flags(wide)),
_ = wxStaticBoxSizer:add(OptionsSz, TransformOptions, zxw:flags(wide)),
_ = wxBoxSizer:add(Sizer, NameSz, zxw:flags(base)),
_ = wxBoxSizer:add(Sizer, SeedSz, zxw:flags(wide)),
_ = wxBoxSizer:add(Sizer, OptionsSz, zxw:flags(base)),
_ = wxBoxSizer:add(Sizer, ButtSz, zxw:flags(base)),
ok = wxDialog:setSizer(Dialog, Sizer),
ok = wxBoxSizer:layout(Sizer),
ok = wxFrame:setSize(Dialog, {400, 300}),
ok = wxFrame:center(Dialog),
ok = wxStyledTextCtrl:setFocus(NameTx),
ok =
case wxDialog:showModal(Dialog) of
?wxID_OK ->
Type = {eddsa, ed25519},
Size = 256,
Name = wxTextCtrl:getValue(NameTx),
Seed = wxTextCtrl:getValue(SeedTx),
Encoding =
case wxChoice:getSelection(EncodingOptions) of
0 -> base64;
1 -> utf8;
2 -> base58
end,
Transform =
case wxChoice:getSelection(TransformOptions) of
0 -> {sha3, 256};
1 -> {sha2, 256};
2 -> {x_or, 256};
3 -> raw
end,
gmc_con:make_key(Type, Size, Name, Seed, Encoding, Transform);
?wxID_CANCEL ->
ok
end,
ok = wxDialog:destroy(Dialog),
State.
recover_key(State = #s{frame = Frame, j = J}) ->
Dialog = wxDialog:new(Frame, ?wxID_ANY, J("Mnemonic")),
Sizer = wxBoxSizer:new(?wxVERTICAL),
MnemSz = wxStaticBoxSizer:new(?wxVERTICAL, Dialog, [{label, J("Recovery Phrase")}]),
MnemTx = wxTextCtrl:new(Dialog, ?wxID_ANY, [{style, ?wxTE_MULTILINE}]),
_ = wxStaticBoxSizer:add(MnemSz, MnemTx, zxw:flags(wide)),
ButtSz = wxBoxSizer:new(?wxHORIZONTAL),
Affirm = wxButton:new(Dialog, ?wxID_OK),
Cancel = wxButton:new(Dialog, ?wxID_CANCEL),
_ = wxBoxSizer:add(ButtSz, Affirm, zxw:flags(wide)),
_ = wxBoxSizer:add(ButtSz, Cancel, zxw:flags(wide)),
_ = wxBoxSizer:add(Sizer, MnemSz, zxw:flags(wide)),
_ = wxBoxSizer:add(Sizer, ButtSz, zxw:flags(base)),
ok = wxDialog:setSizer(Dialog, Sizer),
ok = wxBoxSizer:layout(Sizer),
ok = wxFrame:center(Dialog),
ok = wxStyledTextCtrl:setFocus(MnemTx),
ok =
case wxDialog:showModal(Dialog) of
?wxID_OK ->
Mnemonic = wxTextCtrl:getValue(MnemTx),
gmc_con:recover_key(Mnemonic);
?wxID_CANCEL ->
ok
end,
ok = wxDialog:destroy(Dialog),
State.
show_mnemonic(State = #s{accounts = []}) ->
State;
show_mnemonic(State = #s{picker = Picker}) ->
case wxListBox:getSelection(Picker) of
-1 -> State;
Selected -> show_mnemonic(Selected + 1, State)
end.
show_mnemonic(Selected, State = #s{frame = Frame, j = J, accounts = Accounts}) ->
#ak{id = ID} = lists:nth(Selected, Accounts),
{ok, Mnemonic} = gmc_con:mnemonic(ID),
Dialog = wxDialog:new(Frame, ?wxID_ANY, J("Mnemonic")),
Sizer = wxBoxSizer:new(?wxVERTICAL),
MnemSz = wxStaticBoxSizer:new(?wxVERTICAL, Dialog, [{label, J("Recovery Phrase")}]),
Options = [{value, Mnemonic}, {style, ?wxTE_MULTILINE bor ?wxTE_READONLY}],
MnemTx = wxTextCtrl:new(Dialog, ?wxID_ANY, Options),
_ = wxStaticBoxSizer:add(MnemSz, MnemTx, zxw:flags(wide)),
ButtSz = wxBoxSizer:new(?wxHORIZONTAL),
Affirm = wxButton:new(Dialog, ?wxID_OK),
_ = wxBoxSizer:add(ButtSz, Affirm, zxw:flags(wide)),
_ = wxBoxSizer:add(Sizer, MnemSz, zxw:flags(wide)),
_ = wxBoxSizer:add(Sizer, ButtSz, zxw:flags(base)),
ok = wxDialog:setSizer(Dialog, Sizer),
ok = wxBoxSizer:layout(Sizer),
ok = wxFrame:center(Dialog),
ok = wxStyledTextCtrl:setFocus(MnemTx),
?wxID_OK = wxDialog:showModal(Dialog),
ok = wxDialog:destroy(Dialog),
State.
rename_key(State = #s{accounts = []}) ->
State;
rename_key(State = #s{picker = Picker}) ->
case wxListBox:getSelection(Picker) of
-1 -> State;
Selected -> rename_key(Selected + 1, State)
end.
rename_key(Selected, State = #s{frame = Frame, j = J, accounts = Accounts}) ->
#ak{id = ID, name = Name} = lists:nth(Selected, Accounts),
Dialog = wxDialog:new(Frame, ?wxID_ANY, J("New Key")),
Sizer = wxBoxSizer:new(?wxVERTICAL),
NameSz = wxStaticBoxSizer:new(?wxVERTICAL, Dialog, [{label, J("Name (Optional)")}]),
NameTx = wxTextCtrl:new(Dialog, ?wxID_ANY),
ok = wxTextCtrl:setValue(NameTx, Name),
_ = wxStaticBoxSizer:add(NameSz, NameTx, zxw:flags(base)),
ButtSz = wxBoxSizer:new(?wxHORIZONTAL),
Affirm = wxButton:new(Dialog, ?wxID_OK),
Cancel = wxButton:new(Dialog, ?wxID_CANCEL),
_ = wxBoxSizer:add(ButtSz, Affirm, zxw:flags(wide)),
_ = wxBoxSizer:add(ButtSz, Cancel, zxw:flags(wide)),
_ = wxBoxSizer:add(Sizer, NameSz, zxw:flags(base)),
_ = wxBoxSizer:add(Sizer, ButtSz, zxw:flags(base)),
ok = wxDialog:setSizer(Dialog, Sizer),
ok = wxBoxSizer:layout(Sizer),
ok = wxFrame:center(Dialog),
ok = wxStyledTextCtrl:setFocus(NameTx),
ok =
case wxDialog:showModal(Dialog) of
?wxID_OK ->
NewName = wxTextCtrl:getValue(NameTx),
gmc_con:rename_key(ID, NewName);
?wxID_CANCEL ->
ok
end,
ok = wxDialog:destroy(Dialog),
State.
drop_key(State = #s{accounts = []}) ->
State;
drop_key(State = #s{picker = Picker}) ->
case wxListBox:getSelection(Picker) of
-1 -> State;
Selected -> drop_key(Selected + 1, State)
end.
drop_key(Selected, State = #s{frame = Frame, j = J, accounts = Accounts}) ->
#ak{id = ID, name = Name} = lists:nth(Selected, Accounts),
Dialog = wxDialog:new(Frame, ?wxID_ANY, J("New Key")),
Sizer = wxBoxSizer:new(?wxVERTICAL),
Message = ["REALLY delete key: ", Name, " ?"],
MessageT = wxStaticText:new(Dialog, ?wxID_ANY, Message),
ButtSz = wxBoxSizer:new(?wxHORIZONTAL),
Affirm = wxButton:new(Dialog, ?wxID_OK),
Cancel = wxButton:new(Dialog, ?wxID_CANCEL),
_ = wxBoxSizer:add(ButtSz, Affirm, zxw:flags(wide)),
_ = wxBoxSizer:add(ButtSz, Cancel, zxw:flags(wide)),
_ = wxBoxSizer:add(Sizer, MessageT, zxw:flags(wide)),
_ = wxBoxSizer:add(Sizer, ButtSz, zxw:flags(base)),
ok = wxDialog:setSizer(Dialog, Sizer),
ok = wxBoxSizer:layout(Sizer),
ok = wxFrame:center(Dialog),
ok =
case wxDialog:showModal(Dialog) of
?wxID_OK -> gmc_con:drop_key(ID);
?wxID_CANCEL -> ok
end,
ok = wxDialog:destroy(Dialog),
State.
grids_dialogue(State = #s{frame = Frame, j = J}) ->
tell("Handle GRIDS URL"),
% ok =
% case zxw:modal_text_input(Frame, J("GRIDS"), J("ZA GRIDS"), [J("URL")]) of
% {ok, [URL]} -> tell("Received URL: ~p", [URL]);
% cancel -> tell("User cancelled GRIDS action.")
% end,
State.
handle_button(Name, State) ->
ok = tell("Button Click: ~p", [Name]),
State.
do_selection(Selected,
State = #s{prefs = Prefs, accounts = Accounts,
balance = {_, #w{wx = B}}, id = {_, #w{wx = I}}}) ->
#ak{id = ID, balance = Pucks} = lists:nth(Selected + 1, Accounts),
ok = wxStaticText:setLabel(I, ID),
ok = wxStaticText:setLabel(B, price_to_string(Pucks)),
NewPrefs = maps:put(selected, Selected, Prefs),
State#s{prefs = NewPrefs}.
do_show(Accounts, State = #s{prefs = Prefs, picker = Picker}) ->
AKs = [Name || #ak{name = Name} <- Accounts],
ok = wxListBox:set(Picker, AKs),
case Accounts of
[] ->
State;
[_] ->
Selected = 0,
ok = wxListBox:setSelection(Picker, Selected),
do_selection(Selected, State#s{accounts = Accounts});
_ ->
Selected = maps:get(selected, Prefs),
ok = wxListBox:setSelection(Picker, Selected),
do_selection(Selected, State#s{accounts = Accounts})
end.
do_ask_password(#s{frame = Frame, j = J}) ->
Dialog = wxDialog:new(Frame, ?wxID_ANY, J("Password")),
Sizer = wxBoxSizer:new(?wxVERTICAL),
Label = "Password (leave blank for no password)",
PassSz = wxStaticBoxSizer:new(?wxVERTICAL, Dialog, [{label, J(Label)}]),
PassTx = wxTextCtrl:new(Dialog, ?wxID_ANY),
_ = wxStaticBoxSizer:add(PassSz, PassTx, zxw:flags(wide)),
ButtSz = wxBoxSizer:new(?wxHORIZONTAL),
Affirm = wxButton:new(Dialog, ?wxID_OK),
_ = wxBoxSizer:add(ButtSz, Affirm, zxw:flags(wide)),
_ = wxBoxSizer:add(Sizer, PassSz, zxw:flags(base)),
_ = wxBoxSizer:add(Sizer, ButtSz, zxw:flags(base)),
ok = wxDialog:setSizer(Dialog, Sizer),
ok = wxBoxSizer:layout(Sizer),
ok = wxFrame:center(Dialog),
ok = wxStyledTextCtrl:setFocus(PassTx),
ok =
case wxDialog:showModal(Dialog) of
?wxID_OK ->
Phrase =
case wxTextCtrl:getValue(PassTx) of
"" -> none;
P -> P
end,
gmc_con:login(Phrase);
?wxID_CANCEL ->
gmc_con:login(none)
end,
wxDialog:destroy(Dialog).
%%% Helpers
price_to_string(Pucks) ->
Gaju = 1000000000000000000,
H = integer_to_list(Pucks div Gaju),
R = Pucks rem Gaju,
case string:strip(lists:flatten(io_lib:format("~18..0w", [R])), right, $0) of
[] -> H;
T -> string:join([H, T], ".")
end.
string_to_price(String) ->
case string:split(String, ".") of
[H] -> join_price(H, "0");
[H, T] -> join_price(H, T);
_ -> {error, bad_price}
end.
join_price(H, T) ->
try
Parts = [H, string:pad(T, 18, trailing, $0)],
Price = list_to_integer(unicode:characters_to_list(Parts)),
case Price < 0 of
false -> {ok, Price};
true -> {error, negative_price}
end
catch
error:R -> {error, R}
end.

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%%% A rework of the JumpText idea. To be adapted into actual JumpText for v2.0.
%%% To add translations to a module you add a file named ?MODULE.trans to priv/i18n/.
%%% The file contains an Erlang terms file of the form:
%%% `{LangCode :: atom(), Translations :: #{Phrase :: string() := Translation :: string()}}'
%%% The entire file's contents are returned by `read_translations/1'.
%%% The function `j/2' extracts the dictionary requested and returns a translation
%%% function that closes over the desired phrase dictionary.
%%% The customary way to insert translations into a program is to assign the translation
%%% closure the name `J' and keep it in the local process state. When the user selects
%%% another language, create a new `J' with the desired language.
%%%
%%% `oneshot_j/2' is a convenience function for those who don't intend to keep the
%%% library of translations in memory (calling `oneshot_j/2' will always perform a disk
%%% read, where `j/2' could be called any number of times without a disk read if the
%%% translation library is retained).
-module(gmc_jt).
-export([read_translations/1, j/2, oneshot_j/2]).
read_translations(Module) ->
File = atom_to_list(Module) ++ ".trans",
Path = filename:join([zx:get_home(), "priv", "i18n", File]),
case file:consult(Path) of
{ok, Translations} -> Translations;
{error, enoent} -> []
end.
j(Lang, Translations) ->
case proplists:get_value(Lang, Translations, none) of
none -> fun(Phrase) -> Phrase end;
Dict -> fun(Phrase) -> maps:get(Phrase, Dict, Phrase) end
end.
oneshot_j(Module, Lang) ->
Translations = read_translations(Module),
j(Lang, Translations).

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%%% @doc
%%% Key functions go here.
%%%
%%% The main reason this is a module of its own is that in the original architecture
%%% it was a process rather than just a library of functions. Now that it exists, though,
%%% there is little motivation to cram everything here into the controller process's
%%% code.
%%% @end
-module(gmc_key_master).
-export([make_key/2, encode/1, decode/1]).
-export([lcg/1]).
%-export([start_link/1]).
%-export([init/1, terminate/2, code_change/3,
% handle_call/3, handle_cast/2, handle_info/2, handle_event/2]).
%-include("$zx_include/zx_logger.hrl").
-include("gmc.hrl").
%-record(s,
% {wx = none :: none | wx:wx_object(),
% frame = none :: none | wx:wx_object(),
% lang = en :: en | jp,
% j = none :: none | fun(),
% prefs = #{} :: #{atom() := term()},
% accounts = [] :: [clutch:ak()],
% picker = none :: none | wx:wx_object(),
% balance = {#w{}, #w{}} :: labeled(),
% buttons = [] :: [widget()]}).
%%% Startup Functions
%start_link(Accounts) ->
% wx_object:start_link({local, ?MODULE}, ?MODULE, Accounts, []).
%init({Accounts, Prefs}) ->
% ok = log(info, "GUI starting..."),
% Lang = maps:get(lang, Prefs, en_us),
% Trans = gmc_jt:read_translations(?MODULE),
% J = gmc_jt:j(Lang, Trans),
%
% Selected = maps:get(selected, Prefs, 1),
% AKs = [ID || #ak{id = ID} <- Accounts],
%
% Wx = wx:new(),
% Frame = wxFrame:new(Wx, ?wxID_ANY, J("Gajumaru Clutch")),
% MainSz = wxBoxSizer:new(?wxVERTICAL),
%%%
make_key("", <<>>) ->
Pair = #{public := Public} = ecu_eddsa:sign_keypair(),
ID = aeser_api_encoder:encode(account_pubkey, Public),
Name = binary_to_list(ID),
#key{name = Name, id = ID, pair = Pair};
make_key("", Seed) ->
Pair = #{public := Public} = ecu_eddsa:sign_seed_keypair(Seed),
ID = aeser_api_encoder:encode(account_pubkey, Public),
Name = binary_to_list(ID),
#key{name = Name, id = ID, pair = Pair};
make_key(Name, <<>>) ->
Pair = #{public := Public} = ecu_eddsa:sign_keypair(),
ID = aeser_api_encoder:encode(account_pubkey, Public),
#key{name = Name, id = ID, pair = Pair};
make_key(Name, Seed) ->
Pair = #{public := Public} = ecu_eddsa:sign_seed_keypair(Seed),
ID = aeser_api_encoder:encode(account_pubkey, Public),
#key{name = Name, id = ID, pair = Pair}.
-spec encode(Secret) -> Phrase
when Secret :: binary(),
Phrase :: string().
%% @doc
%% The encoding and decoding procesures are written to be able to handle any
%% width of bitstring or binary and a variable size dictionary. The magic numbers
%% 32, 4096 and 12 have been dropped in because currently these are known, but that
%% will change in the future if the key size or type changes.
encode(Bin) ->
<<Number:(32 * 8)>> = Bin,
DictSize = 4096,
Words = read_words(),
% Width = chunksize(DictSize - 1, 2),
Width = 12,
Chunks = chunksize(Number, DictSize),
Binary = <<Number:(Chunks * Width)>>,
encode(Width, Binary, Words).
encode(Width, Bits, Words) ->
CheckSum = checksum(Width, Bits),
encode(Width, <<CheckSum:Width, Bits/bitstring>>, Words, []).
encode(_, <<>>, _, Acc) ->
unicode:characters_to_list(lists:join(" ", lists:reverse(Acc)));
encode(Width, Bits, Words, Acc) ->
<<I:Width, Rest/bitstring>> = Bits,
Word = lists:nth(I + 1, Words),
encode(Width, Rest, Words, [Word | Acc]).
-spec decode(Phrase) -> {ok, Secret} | {error, Reason}
when Phrase :: string(),
Secret :: binary(),
Reason :: bad_phrase | bad_word.
%% @doc
%% Reverses the encoded secret string back into its binary representation.
decode(Encoded) ->
DictSize = 4096,
Words = read_words(),
Width = chunksize(DictSize - 1, 2),
decode(Width, Words, Encoded).
decode(Width, Words, Encoded) when is_list(Encoded) ->
decode(Width, Words, list_to_binary(Encoded));
decode(Width, Words, Encoded) ->
Split = string:lexemes(Encoded, " "),
decode(Width, Words, Split, <<>>).
decode(Width, Words, [Word | Rest], Acc) ->
case find(Word, Words) of
{ok, N} -> decode(Width, Words, Rest, <<Acc/bitstring, N:Width>>);
Error -> Error
end;
decode(Width, _, [], Acc) ->
sumcheck(Width, Acc).
chunksize(N, C) ->
chunksize(N, C, 0).
chunksize(0, _, A) -> A;
chunksize(N, C, A) -> chunksize(N div C, C, A + 1).
read_words() ->
Path = filename:join([zx:get_home(), "priv", "words4096.txt"]),
{ok, Bin} = file:read_file(Path),
string:lexemes(Bin, "\n").
find(Word, Words) ->
find(Word, Words, 0).
find(Word, [Word | _], N) -> {ok, N};
find(Word, [_ | Rest], N) -> find(Word, Rest, N + 1);
find(Word, [], _) -> {error, {bad_word, Word}}.
checksum(Width, Bits) ->
checksum(Width, Bits, 0).
checksum(_, <<>>, Sum) ->
Sum;
checksum(Width, Bits, Sum) ->
<<N:Width, Rest/bitstring>> = Bits,
checksum(Width, Rest, N bxor Sum).
sumcheck(Width, Bits) ->
<<CheckSum:Width, Binary/bitstring>> = Bits,
case checksum(Width, Binary) =:= CheckSum of
true ->
<<N:(bit_size(Binary))>> = Binary,
{ok, <<N:(32 * 8)>>};
false ->
{error, bad_phrase}
end.
-spec lcg(integer()) -> integer().
%% A simple PRNG that fits into 32 bits and is easy to implement anywhere (Kotlin).
%% Specifically, it is a "linear congruential generator" of the Lehmer variety.
%% The constants used are based on recommendations from Park, Miller and Stockmeyer:
%% https://www.firstpr.com.au/dsp/rand31/p105-crawford.pdf#page=4
%%
%% The input value should be between 1 and 2^31-1.
%%
%% The purpose of this PRNG is for password-based dictionary shuffling.
lcg(N) ->
M = 16#7FFFFFFF,
A = 48271,
Q = 44488, % M div A
R = 3399, % M rem A
Div = N div Q,
Rem = N rem Q,
S = Rem * A,
T = Div * R,
Result = S - T,
case Result < 0 of
false -> Result;
true -> Result + M
end.

46
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%%% @doc
%%% Clutch Top-level Supervisor
%%%
%%% The very top level supervisor in the system. It only has one service branch: the
%%% "con" (program controller). The con is the
%%% only be one part of a larger system. Were this a game system, for example, the
%%% item data management service would be a peer, as would a login credential provision
%%% service, game world event handling, and so on.
%%%
%%% See: http://erlang.org/doc/design_principles/applications.html
%%% See: http://zxq9.com/archives/1311
%%% @end
-module(gmc_sup).
-vsn("0.1.0").
-behaviour(supervisor).
-author("Craig Everett <craigeverett@qpq.swiss>").
-copyright("Craig Everett <craigeverett@qpq.swiss>").
-license("GPL-3.0-or-later").
-export([start_link/0]).
-export([init/1]).
-spec start_link() -> {ok, pid()}.
%% @private
%% This supervisor's own start function.
start_link() ->
supervisor:start_link({local, ?MODULE}, ?MODULE, []).
-spec init([]) -> {ok, {supervisor:sup_flags(), [supervisor:child_spec()]}}.
%% @private
%% The OTP init/1 function.
init([]) ->
RestartStrategy = {one_for_one, 0, 60},
Clients = {gmc_con,
{gmc_con, start_link, []},
permanent,
5000,
worker,
[gmc_con]},
Children = [Clients],
{ok, {RestartStrategy, Children}}.

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{name,"Clutch"}.
{type,gui}.
{modules,[]}.
{prefix,"gmc"}.
{desc,"A desktop client for the Gajumaru network of blockchain networks"}.
{author,"Craig Everett"}.
{package_id,{"otpr","clutch",{0,1,0}}}.
{deps,[{"otpr","erl_base58",{0,1,0}},
{"otpr","aeserialization",{0,1,0}},
{"otpr","eblake2",{1,0,0}},
{"otpr","ec_utils",{1,0,0}},
{"otpr","zxwidgets",{1,0,1}}]}.
{key_name,none}.
{a_email,"craigeverett@qpq.swiss"}.
{c_email,"craigeverett@qpq.swiss"}.
{copyright,"Craig Everett"}.
{file_exts,[]}.
{license,"GPL-3.0-or-later"}.
{repo_url,"https://gitlab.com/ioecs/clutch"}.
{tags,["gaju","gm","gajumaru","wallet","blockchain","cryptocurrency","crypto",
"puck"]}.
{ws_url,"https://gajumaru.io"}.