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% 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.
-module(chttpd_util).
-export([
get_chttpd_config/1,
get_chttpd_config/2,
get_chttpd_config_integer/2,
get_chttpd_config_boolean/2,
get_chttpd_auth_config/1,
get_chttpd_auth_config/2,
get_chttpd_auth_config_integer/2,
get_chttpd_auth_config_boolean/2,
maybe_add_csp_header/3
]).
get_chttpd_config(Key) ->
config:get("chttpd", Key, config:get("httpd", Key)).
get_chttpd_config(Key, Default) ->
config:get("chttpd", Key, config:get("httpd", Key, Default)).
get_chttpd_config_integer(Key, Default) ->
config:get_integer("chttpd", Key,
config:get_integer("httpd", Key, Default)).
get_chttpd_config_boolean(Key, Default) ->
config:get_boolean("chttpd", Key,
config:get_boolean("httpd", Key, Default)).
get_chttpd_auth_config(Key) ->
config:get("chttpd_auth", Key, config:get("couch_httpd_auth", Key)).
get_chttpd_auth_config(Key, Default) ->
config:get("chttpd_auth", Key,
config:get("couch_httpd_auth", Key, Default)).
get_chttpd_auth_config_integer(Key, Default) ->
config:get_integer("chttpd_auth", Key,
config:get_integer("couch_httpd_auth", Key, Default)).
get_chttpd_auth_config_boolean(Key, Default) ->
config:get_boolean("chttpd_auth", Key,
config:get_boolean("couch_httpd_auth", Key, Default)).
maybe_add_csp_header(Component, OriginalHeaders, DefaultHeaderValue) ->
Enabled = config:get_boolean("csp", Component ++ "_enable", true),
case Enabled of
true ->
HeaderValue = config:get("csp", Component ++ "_header_value", DefaultHeaderValue),
% As per https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Security-Policy#multiple_content_security_policies
% The top most CSP header defines the most open policy,
% subsequent CSP headers set by show/list functions can
% only further restrict the policy.
%
% Ours goes on top and we don’t have to worry about additional
% headers set by users.
[{"Content-Security-Policy", HeaderValue} | OriginalHeaders];
false ->
% Fallback for old config vars
case Component of
"utils" ->
handle_legacy_config(OriginalHeaders, DefaultHeaderValue);
_ ->
OriginalHeaders
end
end.
handle_legacy_config(OriginalHeaders, DefaultHeaderValue) ->
LegacyUtilsEnabled = config:get_boolean("csp", "enable", true),
case LegacyUtilsEnabled of
true ->
LegacyUtilsHeaderValue = config:get("csp", "header_value", DefaultHeaderValue),
[{"Content-Security-Policy", LegacyUtilsHeaderValue} | OriginalHeaders];
false ->
OriginalHeaders
end.
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