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japp_error_handler.erl
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%% Copyright 2010 Ulf Angermann
%%
%% Licensed under the Apache License, Version 2.0 (the "License");
%% you may not use this file except in compliance with the License.
%% You may obtain a copy of the License at
%%
%% http://www.apache.org/licenses/LICENSE-2.0
%%
%% Unless required by applicable law or agreed to in writing, software
%% distributed under the License is distributed on an "AS IS" BASIS,
%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
%% See the License for the specific language governing permissions and
%% limitations under the License.
%%% -------------------------------------------------------------------
%%% Author : Ulf Angermann [email protected]
%%% Description :
%%%
%%% Created :
%%% -------------------------------------------------------------------
-module({{appid}}_webmachine_error_handler).
-export([render_error/3]).
render_error(Code, Req, Reason) ->
case Req:has_response_body() of
{true,_} ->
maybe_log(Code, Req, Reason),
Req:response_body();
{false,_} -> render_error_body(Code, Req:trim_state(), Reason)
end.
render_error_body(404, Req, _Reason) ->
{ok, ReqState} = Req:add_response_header("Content-Type", "text/html"),
%%lager:info("..... : ~p", [ReqState]),
{ok, Content} = error_404_dtl:render([]),
{Content, ReqState};
render_error_body(500, Req, Reason) ->
{ok, ReqState} = Req:add_response_header("Content-Type", "text/html"),
maybe_log(500, Req, Reason),
STString = io_lib:format("~p", [Reason]),
ErrorStart = "<html><head><title>500 Internal Server Error</title></head><body><h1>Internal Server Error</h1>The server encountered an error while processing this request:<br><pre>",
ErrorEnd = "</pre><P><HR><ADDRESS>mochiweb+webmachine web server</ADDRESS></body></html>",
ErrorIOList = [ErrorStart,STString,ErrorEnd],
{erlang:iolist_to_binary(ErrorIOList), ReqState};
render_error_body(501, Req, Reason) ->
{ok, ReqState} = Req:add_response_header("Content-Type", "text/html"),
{Method,_} = Req:method(),
webmachine_log:log_error(501, Req, Reason),
ErrorStr = io_lib:format("<html><head><title>501 Not Implemented</title>"
"</head><body><h1>Not Implemented</h1>"
"The server does not support the ~p method.<br>"
"<P><HR><ADDRESS>mochiweb+webmachine web server"
"</ADDRESS></body></html>",
[Method]),
{erlang:iolist_to_binary(ErrorStr), ReqState};
render_error_body(503, Req, Reason) ->
{ok, ReqState} = Req:add_response_header("Content-Type", "text/html"),
webmachine_log:log_error(503, Req, Reason),
ErrorStr = "<html><head><title>503 Service Unavailable</title>"
"</head><body><h1>Service Unavailable</h1>"
"The server is currently unable to handle "
"the request due to a temporary overloading "
"or maintenance of the server.<br>"
"<P><HR><ADDRESS>mochiweb+webmachine web server"
"</ADDRESS></body></html>",
{list_to_binary(ErrorStr), ReqState};
render_error_body(Code, Req, Reason) ->
{ok, ReqState} = Req:add_response_header("Content-Type", "text/html"),
ReasonPhrase = httpd_util:reason_phrase(Code),
Body = ["<html><head><title>",
integer_to_list(Code),
" ",
ReasonPhrase,
"</title></head><body><h1>",
ReasonPhrase,
"</h1>",
Reason,
"<p><hr><address>mochiweb+webmachine web server</address></body></html>"],
{iolist_to_binary(Body), ReqState}.
maybe_log(_Code, _Req, {error, {exit, normal, _Stack}}) ->
%% webmachine_request did an exit(normal), so suppress this
%% message. This usually happens when a chunked upload is
%% interrupted by network failure.
ok;
maybe_log(Code, Req, Reason) ->
webmachine_log:log_error(Code, Req, Reason).