1package restful
2
3import "strings"
4
5// Copyright 2013 Ernest Micklei. All rights reserved.
6// Use of this source code is governed by a license
7// that can be found in the LICENSE file.
8
9// OPTIONSFilter is a filter function that inspects the Http Request for the OPTIONS method
10// and provides the response with a set of allowed methods for the request URL Path.
11// As for any filter, you can also install it for a particular WebService within a Container.
12// Note: this filter is not needed when using CrossOriginResourceSharing (for CORS).
13func (c *Container) OPTIONSFilter(req *Request, resp *Response, chain *FilterChain) {
14	if "OPTIONS" != req.Request.Method {
15		chain.ProcessFilter(req, resp)
16		return
17	}
18
19	archs := req.Request.Header.Get(HEADER_AccessControlRequestHeaders)
20	methods := strings.Join(c.computeAllowedMethods(req), ",")
21	origin := req.Request.Header.Get(HEADER_Origin)
22
23	resp.AddHeader(HEADER_Allow, methods)
24	resp.AddHeader(HEADER_AccessControlAllowOrigin, origin)
25	resp.AddHeader(HEADER_AccessControlAllowHeaders, archs)
26	resp.AddHeader(HEADER_AccessControlAllowMethods, methods)
27}
28
29// OPTIONSFilter is a filter function that inspects the Http Request for the OPTIONS method
30// and provides the response with a set of allowed methods for the request URL Path.
31// Note: this filter is not needed when using CrossOriginResourceSharing (for CORS).
32func OPTIONSFilter() FilterFunction {
33	return DefaultContainer.OPTIONSFilter
34}
35