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Macula HTTP/3 Mesh SDK — connect, subscribe, publish, call, advertise
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Files
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Files
src/macula_quic_cert.erl
%%%-------------------------------------------------------------------
%%% @doc
%%% Macula QUIC certificate utilities.
%%% Provides functions for generating and validating self-signed certificates
%%% for QUIC connections via OpenSSL command-line tool.
%%% @end
%%%-------------------------------------------------------------------
-module(macula_quic_cert).
-export([
generate_self_signed/0,
generate_self_signed/1,
generate_self_signed/2,
validate_files/2
]).
%%%===================================================================
%%% API Functions
%%%===================================================================
%% @doc Generate a self-signed certificate and key in a temporary directory.
%% Returns {ok, CertFile, KeyFile} with paths to generated files.
%% The files are created in /tmp/macula_certs_PID for test isolation.
%% @end
-spec generate_self_signed() -> {ok, file:filename(), file:filename()} | {error, term()}.
generate_self_signed() ->
%% Create a unique temp directory for this process
Dir = lists:flatten(io_lib:format("/tmp/macula_certs_~p", [erlang:pid_to_list(self())])),
case generate_self_signed(Dir) of
{ok, {CertFile, KeyFile}} ->
{ok, CertFile, KeyFile};
{error, Reason} ->
{error, Reason}
end.
%% @doc Generate a self-signed certificate and key in the given directory.
%% Returns {ok, {CertFile, KeyFile}} with paths to generated files.
%% @end
-spec generate_self_signed(file:filename()) -> {ok, {file:filename(), file:filename()}} | {error, term()}.
generate_self_signed(Dir) ->
generate_self_signed(Dir, #{}).
%% @doc Generate a self-signed certificate with custom options.
%% Options:
%% subject - Certificate subject (default: "/CN=macula.local")
%% validity_days - Validity period in days (default: 365)
%% @end
-spec generate_self_signed(file:filename(), map()) -> {ok, {file:filename(), file:filename()}} | {error, term()}.
generate_self_signed(Dir, Opts) ->
%% Ensure directory exists
ok = filelib:ensure_dir(filename:join(Dir, "dummy")),
%% Build file paths
CertFile = filename:join(Dir, "cert.pem"),
KeyFile = filename:join(Dir, "key.pem"),
%% Extract options
Subject = maps:get(subject, Opts, "/CN=macula.local"),
ValidityDays = maps:get(validity_days, Opts, 365),
%% Build openssl command
%% Generate RSA private key (2048 bits) and self-signed certificate in one command
Cmd = io_lib:format(
"openssl req -x509 -newkey rsa:2048 -nodes "
"-keyout ~s -out ~s -days ~p -subj '~s' 2>/dev/null",
[KeyFile, CertFile, ValidityDays, Subject]
),
%% Execute command
case os:cmd(lists:flatten(Cmd)) of
"" ->
%% Success (openssl writes to stderr which we redirected)
{ok, {CertFile, KeyFile}};
Error ->
{error, {openssl_failed, Error}}
end.
%% @doc Validate that both certificate and key files exist and are readable.
-spec validate_files(file:filename(), file:filename()) -> ok | {error, term()}.
validate_files(CertFile, KeyFile) ->
case filelib:is_file(CertFile) of
false ->
{error, {cert_not_found, CertFile}};
true ->
case filelib:is_file(KeyFile) of
false ->
{error, {key_not_found, KeyFile}};
true ->
ok
end
end.