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%% This module echoes back the value the test is interested in.
-module(echo_h).
-export([init/2]).
init(Req, Opts) ->
case cowboy_req:binding(arg, Req) of
undefined ->
echo(cowboy_req:binding(key, Req), Req, Opts);
Arg ->
echo_arg(Arg, Req, Opts)
end.
echo(<<"body">>, Req0, Opts) ->
{ok, Body, Req} = cowboy_req:read_body(Req0),
cowboy_req:reply(200, #{}, Body, Req),
{ok, Req, Opts};
echo(<<"uri">>, Req, Opts) ->
Value = case cowboy_req:path_info(Req) of
[<<"origin">>] -> cowboy_req:uri(Req, #{host => undefined});
[<<"protocol-relative">>] -> cowboy_req:uri(Req, #{scheme => undefined});
[<<"no-qs">>] -> cowboy_req:uri(Req, #{qs => undefined});
[<<"no-path">>] -> cowboy_req:uri(Req, #{path => undefined, qs => undefined});
[<<"set-port">>] -> cowboy_req:uri(Req, #{port => 123});
[] -> cowboy_req:uri(Req)
end,
cowboy_req:reply(200, #{}, Value, Req),
{ok, Req, Opts};
echo(What, Req, Opts) ->
F = binary_to_atom(What, latin1),
Value = cowboy_req:F(Req),
cowboy_req:reply(200, #{}, value_to_iodata(Value), Req),
{ok, Req, Opts}.
echo_arg(Arg0, Req, Opts) ->
F = binary_to_atom(cowboy_req:binding(key, Req), latin1),
Arg = case F of
binding -> binary_to_atom(Arg0, latin1);
_ -> Arg0
end,
Value = case cowboy_req:binding(default, Req) of
undefined -> cowboy_req:F(Arg, Req);
Default -> cowboy_req:F(Arg, Req, Default)
end,
cowboy_req:reply(200, #{}, value_to_iodata(Value), Req),
{ok, Req, Opts}.
value_to_iodata(V) when is_integer(V) -> integer_to_binary(V);
value_to_iodata(V) when is_atom(V) -> atom_to_binary(V, latin1);
value_to_iodata(V) when is_list(V); is_tuple(V); is_map(V) -> io_lib:format("~p", [V]);
value_to_iodata(V) -> V.
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