mirror of
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50 lines
2 KiB
Erlang
50 lines
2 KiB
Erlang
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%% Copyright (c) 2011-2013, Loïc Hoguin <essen@ninenines.eu>
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%%
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%% Permission to use, copy, modify, and/or distribute this software for any
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%% purpose with or without fee is hereby granted, provided that the above
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%% copyright notice and this permission notice appear in all copies.
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%%
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%% THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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%% WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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%% MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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%% ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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%% WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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%% ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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%% OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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%% @doc Routing middleware.
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%%
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%% Resolve the handler to be used for the request based on the
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%% routing information found in the <em>dispatch</em> environment value.
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%% When found, the handler module and associated data are added to
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%% the environment as the <em>handler</em> and <em>handler_opts</em> values
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%% respectively.
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%%
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%% If the route cannot be found, processing stops with either
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%% a 400 or a 404 reply.
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%%
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%% @see cowboy_dispatcher
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-module(cowboy_router).
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-behaviour(cowboy_middleware).
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-export([execute/2]).
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%% @private
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-spec execute(Req, Env)
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-> {ok, Req, Env} | {error, 400 | 404, Req}
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when Req::cowboy_req:req(), Env::cowboy_middleware:env().
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execute(Req, Env) ->
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{_, Dispatch} = lists:keyfind(dispatch, 1, Env),
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[Host, Path] = cowboy_req:get([host, path], Req),
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case cowboy_dispatcher:match(Dispatch, Host, Path) of
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{ok, Handler, HandlerOpts, Bindings, HostInfo, PathInfo} ->
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Req2 = cowboy_req:set_bindings(HostInfo, PathInfo, Bindings, Req),
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{ok, Req2, [{handler, Handler}, {handler_opts, HandlerOpts}|Env]};
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{error, notfound, host} ->
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{error, 400, Req};
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{error, badrequest, path} ->
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{error, 400, Req};
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{error, notfound, path} ->
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{error, 404, Req}
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end.
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