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mod_http: Reintroduce support for disabling or limiting CORS (fixes #1730)

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This is far better than pre-0.12, because we now have a universal way to
configure and enable/disable CORS on a per-module basis.
This commit is contained in:
Matthew Wild 2022-03-28 14:40:21 +01:00
parent fdd5f22b8a
commit 331ede129e
1 changed files with 31 additions and 13 deletions
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44
plugins/mod_http.lua
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@ -31,8 +31,10 @@ server.set_option("body_size_limit", module:get_option_number("http_max_content_
server.set_option("buffer_size_limit", module:get_option_number("http_max_buffer_size"));
-- CORS settings
local cors_overrides = module:get_option("http_cors_override", {});
local opt_methods = module:get_option_set("access_control_allow_methods", { "GET", "OPTIONS" });
local opt_headers = module:get_option_set("access_control_allow_headers", { "Content-Type" });
local opt_origins = module:get_option_set("access_control_allow_origins");
local opt_credentials = module:get_option_boolean("access_control_allow_credentials", false);
local opt_max_age = module:get_option_number("access_control_max_age", 2 * 60 * 60);
@ -109,7 +111,10 @@ function moduleapi.http_url(module, app_name, default_path)
return "http://disabled.invalid/";
end
local function apply_cors_headers(response, methods, headers, max_age, allow_credentials, origin)
local function apply_cors_headers(response, methods, headers, max_age, allow_credentials, allowed_origins, origin)
if allowed_origins and not allowed_origins[origin] then
return;
end
response.headers.access_control_allow_methods = tostring(methods);
response.headers.access_control_allow_headers = tostring(headers);
response.headers.access_control_max_age = tostring(max_age)
@ -141,10 +146,14 @@ function module.add_host(module)
local app_methods = opt_methods;
local app_headers = opt_headers;
local app_credentials = opt_credentials;
local app_origins;
if opt_origins and not (opt_origins:empty() or opt_origins:contains("*")) then
opt_origins = opt_origins._items;
end
local function cors_handler(event_data)
local request, response = event_data.request, event_data.response;
apply_cors_headers(response, app_methods, app_headers, opt_max_age, app_credentials, request.headers.origin);
apply_cors_headers(response, app_methods, app_headers, opt_max_age, app_credentials, app_origins, request.headers.origin);
end
local function options_handler(event_data)
@ -152,17 +161,26 @@ function module.add_host(module)
return "";
end
if event.item.cors then
local cors = event.item.cors;
if cors.credentials ~= nil then
app_credentials = cors.credentials;
end
if cors.headers then
for header, enable in pairs(cors.headers) do
if enable and not app_headers:contains(header) then
app_headers = app_headers + set.new { header };
elseif not enable and app_headers:contains(header) then
app_headers = app_headers - set.new { header };
local cors = cors_overrides[app_name] or event.item.cors;
if cors then
if cors.enabled ~= false then
if cors.credentials ~= nil then
app_credentials = cors.credentials;
end
if cors.headers then
for header, enable in pairs(cors.headers) do
if enable and not app_headers:contains(header) then
app_headers = app_headers + set.new { header };
elseif not enable and app_headers:contains(header) then
app_headers = app_headers - set.new { header };
end
end
end
if cors.origins then
if cors.origins == "*" or cors.origins[1] == "*" then
app_origins = nil;
else
app_origins = set.new(cors.origins)._items;
end
end
end