Created
September 26, 2012 16:53
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basic auth with Cowboy
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| -module(auth_handler). | |
| -compile({parse_transform, seqbind}). | |
| -export([init/3, handle/2, terminate/2]). | |
| -define(USERNAME, <<"admin">>). | |
| -define(PASSWORD, <<"password">>). | |
| %% public | |
| init(_Transport, Req, []) -> | |
| {ok, Req, undefined}. | |
| handle(Req@, State) -> | |
| {Username, Password, Req@} = credentials(Req@), | |
| {ok, Req@} = | |
| case {Username, Password} of | |
| {?USERNAME, ?PASSWORD} -> | |
| cowboy_http_req:reply(200, [{'Content-Type', <<"text/html">>}], <<"hello world!">>, Req@); | |
| _ -> | |
| unauthorized(Req@) | |
| end, | |
| {ok, Req@, State}. | |
| terminate(_Req, _State) -> | |
| ok. | |
| %% private | |
| credentials(Req@) -> | |
| {AuthorizationHeader, Req@} = cowboy_http_req:header('Authorization', Req@), | |
| case AuthorizationHeader of | |
| undefined -> | |
| {undefined, undefined, Req@}; | |
| _ -> | |
| {Username, Password} = credentials_from_header(AuthorizationHeader), | |
| {Username, Password, Req@} | |
| end. | |
| credentials_from_header(AuthorizationHeader) -> | |
| case binary:split(AuthorizationHeader, <<$ >>) of | |
| [<<"Basic">>, EncodedCredentials] -> | |
| decoded_credentials(EncodedCredentials); | |
| _ -> | |
| {undefined, undefined} | |
| end. | |
| decoded_credentials(EncodedCredentials) -> | |
| DecodedCredentials = base64:decode(EncodedCredentials), | |
| case binary:split(DecodedCredentials, <<$:>>) of | |
| [Username, Password] -> | |
| {Username, Password}; | |
| _ -> | |
| {undefined, undefined} | |
| end. | |
| unauthorized(Req@) -> | |
| {ok, Req@} = cowboy_http_req:set_resp_header(<<"Www-Authenticate">>, <<"Basic realm=\"Secure Area\"">>, Req@), | |
| {ok, Req@} = cowboy_http_req:set_resp_body(unauthorized_body(), Req@), | |
| cowboy_http_req:reply(401, Req@). | |
| unauthorized_body() -> | |
| <<" | |
| <!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\" | |
| \"http://www.w3.org/TR/1999/REC-html401-19991224/loose.dt\"> | |
| <HTML> | |
| <HEAD> | |
| <TITLE>Error</TITLE> | |
| <META HTTP-EQUIV=\"Content-Type\" CONTENT=\"text/html; charset=ISO-8859-1\"> | |
| </HEAD> | |
| <BODY><H1>401 Unauthorized.</H1></BODY> | |
| </HTML> | |
| ">>. |
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