Forked from sebmaynard/ca_cowboy_middleware.erl
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March 28, 2018 08:05
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[For Cowboy 2.0] A Cowboy middleware to set some CORS headers for every request, and to handle OPTIONS requests without needing to implement them in every handler.
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-module(ca_cowboy_middleware). | |
-behaviour(cowboy_middleware). | |
-export([execute/2]). | |
execute(Req, Env) -> | |
{ok, ReqWithCorsHeaders} = set_cors_headers(Req), | |
Method = cowboy_req:method(ReqWithCorsHeaders), | |
case Method of | |
<<"OPTIONS">> -> | |
ReqFinal = cowboy_req:reply(200, ReqWithCorsHeaders), | |
{stop, ReqFinal}; | |
_ -> | |
%% continue as normal | |
{ok, ReqWithCorsHeaders, Env} | |
end. | |
%% =================================================================== | |
%% Helpers | |
%% =================================================================== | |
set_headers(Headers, Req) -> | |
ReqWithHeaders = lists:foldl(fun({Header, Value}, ReqIn) -> | |
ReqWithHeader = cowboy_req:set_resp_header(Header, Value, ReqIn), | |
ReqWithHeader | |
end, Req, Headers), | |
{ok, ReqWithHeaders}. | |
set_cors_headers(Req) -> | |
Headers = [{<<"access-control-allow-origin">>, <<"*">>}, | |
{<<"access-control-allow-methods">>, <<"POST, GET, OPTIONS">>}, | |
{<<"access-control-allow-headers">>, <<"Origin, X-Requested-With, Content-Type, Accept">>}, | |
{<<"access-control-max-age">>, <<"1000">>}], | |
{ok, Req2} = set_headers(Headers, Req), | |
{ok, Req2}. |
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{middlewares, [cowboy_router, ca_cowboy_middleware, cowboy_handler]} |
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